http.bend
bend-kit-http@0.30.0.0 · 6,645 lines · 0 definitions
1# HTTP/1.1 and HTTP/2 client, with an HTTP/1.1 server. Source: https://github.com/paymog/bend-kit/tree/main/http
2import Base
3import bend-kit-http@0.30.0.0/admission.bend as Admission
4import bend-kit-http@0.30.0.0/completion.bend as Completion
5# By hash: bend-kit-url@0.4.1.0, -encoding@0.3.0.0, -json@0.5.0.1, -bytes@0.3.0.0, -zlib@0.2.0.0.
6import bend-kit-wire@0.4.5.0/wire.bend as Wire
7import bend-kit-http2@0.1.2.0/http2.bend as H2
8import bend-kit-http2@0.1.2.0/hpack.bend as Hpack
9import bend-kit-bytes@0.3.1.0/bytes.bend as HBytes
10import bend-kit-time@0.1.0.0/time.bend as Time
11import bend-kit-int@0.2.0.0/int.bend as Int
12import bend-kit-concurrency@0.1.0.0/concurrency.bend as Conc
13import bend-kit-url@0.4.1.0/url.bend as Url
14import bend-kit-encoding@0.3.0.0/encoding.bend as Enc
15import bend-kit-json@0.5.0.1/json.bend as Json
16import bend-kit-bytes@0.3.0.0/bytes.bend as Bytes
17import bend-kit-dns@0.5.0.0/dns.bend as Dns
18import bend-kit-zlib@0.2.0.0/zlib.bend as Zlib
19
20# HTTP/1.1 codec and client (RFC 9112) for http:// and https:// (OpenSSL 3 at run time).
21# parse: start-line → field lines → blank → body length (§6.3); chunked (§7.1).
22# Bodies are Bytes. The String parsers below are the spec: one Char per octet.
23# fetch reads until frame() says the response is whole. It returns Result, not Maybe.
24# Build with -o for big bodies: the `bend file.bend` runner overflows on ~30 KB strings; native binaries do not.
25# import bend-kit-http@0.22.0.0/http.bend as Http
26
27type Req is Type:
28 Req{method: String, path: String, headers: Map<&2, List<&2, String>>, body: Bytes.Bytes}
29
30type Res is Type:
31 Res{status: U32, headers: Map<&2, List<&2, String>>, body: Bytes.Bytes}
32
33# A typed Data payload can be captured in receipt; the response remains affine.
34type Reply is Type:
35 Reply{response: Res, receipt: Completion.Receipt}
36
37def reply.complete(~D: Data, ~done: Completion.Completion<D> -> IO(Unit), payload: D, response: Res) -> Reply:
38 Reply{response, Completion.receipt(~D, ~done, payload)}
39
40
41# The body type and its conversions, so a caller needs no bytes import.
42def Body() -> Type:
43 Bytes.Bytes
44
45# A byte string (one Char per octet) to a body, and back.
46def from_string(+s: String) -> Bytes.Bytes:
47 Bytes.from_string(s)
48
49def to_string(b: Bytes.Bytes) -> String:
50 Bytes.to_string(b)
51
52def length(b: Bytes.Bytes) -> Bytes.Bytes & U32:
53 Bytes.length(b)
54
55# Why fetch failed. Wire errors keep the errno and the text the effect already had.
56# ponytail: 60 and 110 are ETIMEDOUT on macOS and Linux. Windows is out of scope.
57type Err is Data:
58 ErrUrl{}
59 ErrDns{}
60 ErrConnect{code: U32, why: String}
61 ErrTls{code: U32, why: String}
62 ErrRead{code: U32, why: String}
63 ErrWrite{code: U32, why: String}
64 ErrTimeout{}
65 ErrRedirect{}
66 ErrBad{}
67
68def err.late(+code: U32) -> Bool:
69 Bool.or(U32.is_eq(code, 60), U32.is_eq(code, 110))
70
71def err.pick(e: Err, late: Bool) -> Err:
72 match late:
73 case True{}:
74 ErrTimeout{}
75 case False{}:
76 e
77
78def err.or_late(code: U32, e: Err) -> Err:
79 err.pick(e, err.late(code))
80
81type Fields is Data:
82 FieldsBad{}
83 FieldsOk{m: Map<&2, List<&2, String>>}
84
85# One list per field name, in arrival order. header() is the first value.
86# Set-Cookie is never joined. Encode writes one line per value.
87def empty() -> Map<&2, List<&2, String>>:
88 Map.new(&2, List<&2, String>)
89
90def fields.of(r: Map<&2, List<&2, String>> & List<&2, String>) -> List<&2, String>:
91 (h, xs) = r
92 xs
93
94def fields(+h: Map<&2, List<&2, String>>, k: String) -> List<&2, String>:
95 fields.of(Map.get(List<&2, String>, Nil{}, h, k))
96
97def header.first(xs: List<&2, String>) -> String:
98 match xs:
99 case Nil{}:
100 ""
101 case Con{v, t}:
102 v
103
104def header(+h: Map<&2, List<&2, String>>, k: String) -> String:
105 header.first(fields(h, k))
106
107def field.last(xs: List<&2, String>) -> String:
108 match xs:
109 case Nil{}:
110 ""
111 case Con{v, Nil{}}:
112 v
113 case Con{v, t}:
114 field.last(t)
115
116# Transfer-Encoding is a list; chunked, when present, is the last coding.
117def header.last(+h: Map<&2, List<&2, String>>, k: String) -> String:
118 field.last(fields(h, k))
119
120def snoc(xs: List<&2, String>, v: String) -> List<&2, String>:
121 match xs:
122 case Nil{}:
123 [v]
124 case Con{h, t}:
125 Con{h, snoc(t, v)}
126
127def set(m: Map<&2, List<&2, String>>, k: String, v: String) -> Map<&2, List<&2, String>>:
128 Map.set(&2, List<&2, String>, m, k, [v])
129
130def add(+m: Map<&2, List<&2, String>>, +k: String, v: String) -> Map<&2, List<&2, String>>:
131 Map.set(&2, List<&2, String>, m, k, snoc(fields(m, k), v))
132
133def sanitize.cons(ch: Char, rest: String, drop: Bool) -> String:
134 match drop:
135 case True{}:
136 rest
137 case False{}:
138 SCon{ch, rest}
139
140def sanitize(s: String) -> String:
141 match s:
142 case SNil{}:
143 SNil{}
144 case SCon{Chr{+c}, t}:
145 sanitize.cons(Chr{c}, sanitize(t), Bool.or(U32.is_eq(c, 13), U32.is_eq(c, 10)))
146
147def drop_cr.last.if(cr: Bool, c: U32) -> String:
148 match cr:
149 case True{}:
150 SNil{}
151 case False{}:
152 SCon{Chr{c}, SNil{}}
153
154def drop_cr.last(+c: U32) -> String:
155 drop_cr.last.if(U32.is_eq(c, 13), c)
156
157# prev is the char before s; it is kept unless it is a final CR.
158def drop_cr.go(s: String, prev: U32) -> String:
159 match s:
160 case SNil{}:
161 drop_cr.last(prev)
162 case SCon{Chr{c}, t}:
163 SCon{Chr{prev}, drop_cr.go(t, c)}
164
165def drop_cr(s: String) -> String:
166 match s:
167 case SNil{}:
168 SNil{}
169 case SCon{Chr{c}, t}:
170 drop_cr.go(t, c)
171
172# w holds the last four octets; a char past 255 clears it.
173def blank_end.go(s: String, w: U32) -> Bool:
174 match s:
175 case SNil{}:
176 U32.is_eq(w, 218762506)
177 case SCon{Chr{+c}, t}:
178 blank_end.go(t, Bool.pick(U32, U32.is_lt(c, 256), (w * 256 + c : U32), 0))
179
180# String.ends_with(s, "\r\n\r\n") in one pass, with no reversed copy.
181def blank_end(s: String) -> Bool:
182 blank_end.go(s, 0)
183
184def trim_end.cons(h: Char, r: String, space: Bool) -> String:
185 match r:
186 case SNil{}:
187 match space:
188 case True{}:
189 SNil{}
190 case False{}:
191 SCon{h, SNil{}}
192 case SCon{a, t}:
193 SCon{h, SCon{a, t}}
194
195# String.trim_end without the two reversed copies.
196def trim_end(s: String) -> String:
197 match s:
198 case SNil{}:
199 SNil{}
200 case SCon{+h, t}:
201 trim_end.cons(h, trim_end(t), Char.is_space(h))
202
203def trim(s: String) -> String:
204 trim_end(String.trim_start(s))
205
206# Bool.pick evaluates both arms; a split that recursed inside it would reverse acc at every byte.
207def take.cut(acc: String, rest: String) -> String & String:
208 (String.reverse(String.drop(acc, 1n)), rest)
209
210# hit: the last char pushed onto acc was the stop char.
211def take_sp.go(s: String, acc: String, hit: Bool) -> String & String:
212 match s:
213 case SNil{}:
214 match hit:
215 case True{}:
216 take.cut(acc, SNil{})
217 case False{}:
218 (String.reverse(acc), SNil{})
219 case SCon{Chr{+c}, t}:
220 match hit:
221 case True{}:
222 take.cut(acc, SCon{Chr{c}, t})
223 case False{}:
224 take_sp.go(t, SCon{Chr{c}, acc}, U32.is_eq(c, 32))
225
226def take_sp(s: String) -> String & String:
227 take_sp.go(s, SNil{}, False{})
228
229def start_line.ver(m: String, pv: String & String) -> String & String & String:
230 (p, v) = pv
231 (m, p, drop_cr(v))
232
233def start_line.rest(mr: String & String) -> String & String & String:
234 (m, r) = mr
235 start_line.ver(m, take_sp(r))
236
237def start_line(s: String) -> String & String & String:
238 start_line.rest(take_sp(s))
239
240def split_at_blank.go(s: String, e: Bool, w: U32, acc: String) -> String & String:
241 match s:
242 case SNil{}:
243 (String.reverse(acc), SNil{})
244 case SCon{Chr{+a}, t}:
245 match e:
246 case True{}:
247 (String.reverse(acc), SCon{Chr{a}, t})
248 case False{}:
249 +w2 = (w * 256 + a : U32)
250 split_at_blank.go(t, U32.is_eq(w2, 218762506), w2, SCon{Chr{a}, acc})
251
252# split_at_blank, plus whether the head ends in the blank line.
253def split_at_blank.flag.go(+raw: String, s: String, off: Nat, w: U32, e: Bool) -> String & String & Bool:
254 match s:
255 case SNil{}:
256 (String.take(raw, off), SNil{}, e)
257 case SCon{Chr{+a}, t}:
258 match e:
259 case True{}:
260 (String.take(raw, off), SCon{Chr{a}, t}, True{})
261 case False{}:
262 +w2 = (w * 256 + a : U32)
263 +off1 = (1n + off : Nat)
264 split_at_blank.flag.go(raw, t, off1, w2, U32.is_eq(w2, 218762506))
265
266def split_at_blank.pair(r: String & String & Bool) -> String & String:
267 (head, rest, whole) = r
268 (head, rest)
269
270def split_at_blank(+s: String) -> String & String:
271 split_at_blank.pair(split_at_blank.flag.go(s, s, 0n, 0, False{}))
272
273def split_colon.go(s: String, acc: String, hit: Bool) -> String & String:
274 match s:
275 case SNil{}:
276 match hit:
277 case True{}:
278 take.cut(acc, SNil{})
279 case False{}:
280 (String.reverse(acc), SNil{})
281 case SCon{Chr{+c}, t}:
282 match hit:
283 case True{}:
284 take.cut(acc, SCon{Chr{c}, t})
285 case False{}:
286 split_colon.go(t, SCon{Char.to_lower(Chr{c}), acc}, U32.is_eq(c, 58))
287
288def split_colon(+s: String) -> String & String:
289 split_colon.go(s, SNil{}, False{})
290
291def has_header.of(r: Map<&2, List<&2, String>> & Bool) -> Bool:
292 (h, b) = r
293 b
294
295def has_header(+h: Map<&2, List<&2, String>>, k: String) -> Bool:
296 has_header.of(Map.has(&2, List<&2, String>, h, k))
297
298def folded(+line: String) -> Bool:
299 Bool.or(String.starts_with(line, " "), String.starts_with(line, "\t"))
300
301def tracked(+k: String) -> Bool:
302 Bool.or(String.eq(k, "host"), String.eq(k, "content-length"))
303
304def fields_put.dup(m: Map<&2, List<&2, String>>, k: String, v: String, bad: Bool) -> Fields:
305 match bad:
306 case True{}:
307 FieldsBad{}
308 case False{}:
309 FieldsOk{add(m, k, v)}
310
311def fields_put.tracked(+m: Map<&2, List<&2, String>>, +k: String, v: String, t: Bool) -> Fields:
312 match t:
313 case True{}:
314 fields_put.dup(m, k, v, has_header(m, k))
315 case False{}:
316 FieldsOk{add(m, k, v)}
317
318def fields_put.key(+m: Map<&2, List<&2, String>>, +k: String, v: String) -> Fields:
319 fields_put.tracked(m, k, v, tracked(k))
320
321def fields_put.kv(m: Map<&2, List<&2, String>>, kv: String & String) -> Fields:
322 (k, v) = kv
323 fields_put.key(m, k, trim(v))
324
325def fields_put.fold(m: Map<&2, List<&2, String>>, line: String, fold: Bool) -> Fields:
326 match fold:
327 case True{}:
328 FieldsBad{}
329 case False{}:
330 fields_put.kv(m, split_colon(line))
331
332def fields_put.empty(m: Map<&2, List<&2, String>>, +line: String, e: Bool) -> Fields:
333 match e:
334 case True{}:
335 FieldsOk{m}
336 case False{}:
337 fields_put.fold(m, line, folded(line))
338
339def fields_put.ok(m: Map<&2, List<&2, String>>, +line: String) -> Fields:
340 fields_put.empty(m, line, String.is_empty(line))
341
342def fields_put(acc: Fields, line: String) -> Fields:
343 match acc:
344 case FieldsBad{}:
345 FieldsBad{}
346 case FieldsOk{m}:
347 fields_put.ok(m, line)
348
349def parse.headers.done(acc: Fields) -> Maybe<&2, Map<&2, List<&2, String>>>:
350 match acc:
351 case FieldsBad{}:
352 None{}
353 case FieldsOk{m}:
354 Some{m}
355
356
357def parse.headers.scan.line(acc: String, fields: Fields) -> Fields:
358 match acc:
359 case SCon{Chr{13}, t}:
360 fields_put(fields, String.reverse(t))
361 case other:
362 fields_put(fields, String.reverse(other))
363
364def parse.headers.scan(s: String, acc: String, fields: Fields) -> Fields:
365 match s:
366 case SNil{}:
367 parse.headers.scan.line(acc, fields)
368 case SCon{Chr{10}, t}:
369 parse.headers.scan(t, SNil{}, parse.headers.scan.line(acc, fields))
370 case SCon{c, t}:
371 parse.headers.scan(t, SCon{c, acc}, fields)
372
373def parse.headers.raw(s: String) -> Maybe<&2, Map<&2, List<&2, String>>>:
374 parse.headers.done(parse.headers.scan(s, SNil{}, FieldsOk{empty()}))
375
376def parse.first(s: String, acc: String) -> String & String:
377 match s:
378 case SNil{}:
379 (String.reverse(acc), SNil{})
380 case SCon{Chr{10}, t}:
381 (String.reverse(acc), t)
382 case SCon{c, t}:
383 parse.first(t, SCon{c, acc})
384
385def parse_u32.digit(+c: U32) -> Bool:
386 Bool.and(U32.is_le(48, c), U32.is_le(c, 57))
387
388def parse_u32.add(acc: U32, c: U32) -> U32:
389 (acc * 10 + (c - 48 : U32) : U32)
390
391def parse_u32.done(acc: U32, bad: Bool) -> Maybe<&2, U32>:
392 match bad:
393 case True{}:
394 None{}
395 case False{}:
396 Some{acc}
397
398def parse_u32.go(s: String, acc: U32, bad: Bool) -> Maybe<&2, U32>:
399 match s:
400 case SNil{}:
401 parse_u32.done(acc, bad)
402 case SCon{Chr{+c}, t}:
403 parse_u32.go(t, parse_u32.add(acc, c), Bool.or(bad, Bool.not(parse_u32.digit(c))))
404
405def parse_u32(s: String) -> Maybe<&2, U32>:
406 match s:
407 case SNil{}:
408 None{}
409 case SCon{Chr{+c}, t}:
410 parse_u32.go(t, parse_u32.add(0, c), Bool.not(parse_u32.digit(c)))
411
412# More: a valid prefix. Bad: cannot become a body. Body: a whole chunked body.
413type Hold is Data:
414 HoldMore{}
415 HoldBad{}
416 HoldBody{b: String}
417 HoldUntil{b: String}
418
419def is_hex(+c: U32) -> Bool:
420 Bool.or(parse_u32.digit(c), Bool.or(Bool.and(U32.is_le(97, c), U32.is_le(c, 102)), Bool.and(U32.is_le(65, c), U32.is_le(c, 70))))
421
422def hexv(+c: U32) -> U32:
423 Bool.pick(U32, parse_u32.digit(c), (c - 48 : U32), Bool.pick(U32, U32.is_le(c, 70), (c - 55 : U32), (c - 87 : U32)))
424
425# A chunked body decoder that reads each byte once, so a body fed in pieces
426# costs O(bytes) in total. Tr{j}: j bytes of the closing CRLF CRLF matched.
427type Dc is Data:
428 DcSize{acc: U32, seen: Bool}
429 DcExt{n: U32}
430 DcSizeLf{n: U32}
431 DcData{k: U32}
432 DcDataCr{}
433 DcDataLf{}
434 DcTr{j: U32}
435 DcDone{}
436 DcBad{}
437
438# st: where the decoder is. racc: the body so far, reversed. rest: bytes after a Done body.
439type Dco is Data:
440 Dco{st: Dc, racc: String, rest: String}
441
442def dc.start() -> Dc:
443 DcSize{0, False{}}
444
445def dc.size.semi(+n: U32, semi: Bool) -> Dc:
446 match semi:
447 case True{}:
448 DcExt{n}
449 case False{}:
450 DcBad{}
451
452def dc.size.cr(+n: U32, +c: U32, cr: Bool) -> Dc:
453 match cr:
454 case True{}:
455 DcSizeLf{n}
456 case False{}:
457 dc.size.semi(n, U32.is_eq(c, 59))
458
459def dc.size.end(+n: U32, +c: U32, seen: Bool) -> Dc:
460 match seen:
461 case False{}:
462 DcBad{}
463 case True{}:
464 dc.size.cr(n, c, U32.is_eq(c, 13))
465
466# A size that would overflow 32 bits ends the digits, and size.end then refuses it.
467def dc.size(+acc: U32, seen: Bool, +c: U32, digit: Bool) -> Dc:
468 match digit:
469 case True{}:
470 DcSize{(acc * 16 + hexv(c) : U32), True{}}
471 case False{}:
472 dc.size.end(acc, c, seen)
473
474# RFC 9112 §7.1.1: recipients ignore unknown chunk extensions; a bare LF is not CRLF.
475def dc.ext.lf(+n: U32, lf: Bool) -> Dc:
476 match lf:
477 case True{}:
478 DcBad{}
479 case False{}:
480 DcExt{n}
481
482def dc.ext(+n: U32, +c: U32, cr: Bool) -> Dc:
483 match cr:
484 case True{}:
485 DcSizeLf{n}
486 case False{}:
487 dc.ext.lf(n, U32.is_eq(c, 10))
488
489def dc.sized(+n: U32, zero: Bool) -> Dc:
490 match zero:
491 case True{}:
492 DcTr{2}
493 case False{}:
494 DcData{n}
495
496def dc.size.lf(+n: U32, lf: Bool) -> Dc:
497 match lf:
498 case True{}:
499 dc.sized(n, U32.is_eq(n, 0))
500 case False{}:
501 DcBad{}
502
503# k data bytes are left and m of them were just read.
504def dc.data(+k: U32, +m: U32) -> Dc:
505 Bool.pick(Dc, U32.is_le(k, m), DcDataCr{}, DcData{(k - m : U32)})
506
507def dc.pick(ok: Bool, next: Dc) -> Dc:
508 match ok:
509 case True{}:
510 next
511 case False{}:
512 DcBad{}
513
514# ponytail: trailer fields are dropped unparsed (§7.1.2 allows discarding)
515def dc.tr.hit(+j: U32) -> Dc:
516 Bool.pick(Dc, U32.is_eq(j, 3), DcDone{}, DcTr{(j + 1 : U32)})
517
518def dc.tr(+j: U32, +c: U32, hit: Bool) -> Dc:
519 match hit:
520 case True{}:
521 dc.tr.hit(j)
522 case False{}:
523 Bool.pick(Dc, U32.is_eq(c, 13), DcTr{1}, DcTr{0})
524
525def dc.tr.want(+j: U32) -> U32:
526 Bool.pick(U32, U32.is_eq(U32.mod(j, 2), 0), 13, 10)
527
528def dc.byte(h: Char) -> U32:
529 Chr{c} = h
530 c
531
532# One byte c. Done and Bad never look at it, and a data byte is not inspected.
533def dc.step(st: Dc, +c: U32) -> Dc:
534 match st:
535 case DcBad{}:
536 DcBad{}
537 case DcSize{+acc, seen}:
538 dc.size(acc, seen, c, Bool.and(is_hex(c), U32.is_le(acc, 268435455)))
539 case DcExt{+n}:
540 dc.ext(n, c, U32.is_eq(c, 13))
541 case DcSizeLf{+n}:
542 dc.size.lf(n, U32.is_eq(c, 10))
543 case DcDataCr{}:
544 dc.pick(U32.is_eq(c, 13), DcDataLf{})
545 case DcDataLf{}:
546 dc.pick(U32.is_eq(c, 10), dc.start())
547 case DcTr{+j}:
548 dc.tr(j, c, U32.is_eq(c, dc.tr.want(j)))
549 case DcData{+k}:
550 dc.data(k, 1)
551 case DcDone{}:
552 DcDone{}
553
554def dc.live(st: Dc) -> Bool:
555 match st:
556 case DcDone{}:
557 False{}
558 case DcBad{}:
559 False{}
560 case DcSize{a, b}:
561 True{}
562 case DcExt{n}:
563 True{}
564 case DcSizeLf{n}:
565 True{}
566 case DcData{k}:
567 True{}
568 case DcDataCr{}:
569 True{}
570 case DcDataLf{}:
571 True{}
572 case DcTr{j}:
573 True{}
574
575def dc.feed(s: String, st: Dc, racc: String) -> Dco:
576 match s:
577 case SNil{}:
578 Dco{st, racc, ""}
579 case SCon{h, t}:
580 match st:
581 case DcBad{}:
582 Dco{DcBad{}, racc, ""}
583 case DcDone{}:
584 Dco{DcDone{}, racc, SCon{h, t}}
585 case DcData{+k}:
586 dc.feed(t, dc.data(k, 1), SCon{h, racc})
587 case DcSize{+acc, seen}:
588 dc.feed(t, dc.step(DcSize{acc, seen}, dc.byte(h)), racc)
589 case DcExt{+n}:
590 dc.feed(t, dc.step(DcExt{n}, dc.byte(h)), racc)
591 case DcSizeLf{+n}:
592 dc.feed(t, dc.step(DcSizeLf{n}, dc.byte(h)), racc)
593 case DcDataCr{}:
594 dc.feed(t, dc.step(DcDataCr{}, dc.byte(h)), racc)
595 case DcDataLf{}:
596 dc.feed(t, dc.step(DcDataLf{}, dc.byte(h)), racc)
597 case DcTr{+j}:
598 dc.feed(t, dc.step(DcTr{j}, dc.byte(h)), racc)
599
600def chunk.hold(o: Dco) -> Hold:
601 Dco{st, racc, rest} = o
602 match st:
603 case DcDone{}:
604 HoldBody{String.reverse(racc)}
605 case DcBad{}:
606 HoldBad{}
607 case DcSize{a, b}:
608 HoldMore{}
609 case DcExt{n}:
610 HoldMore{}
611 case DcSizeLf{n}:
612 HoldMore{}
613 case DcData{k}:
614 HoldMore{}
615 case DcDataCr{}:
616 HoldMore{}
617 case DcDataLf{}:
618 HoldMore{}
619 case DcTr{j}:
620 HoldMore{}
621
622def chunk.live(s: String) -> Hold:
623 chunk.hold(dc.feed(s, dc.start(), ""))
624
625def chunk.rest(o: Dco) -> Maybe<&2, String>:
626 Dco{st, racc, rest} = o
627 match st:
628 case DcDone{}:
629 Some{rest}
630 case DcBad{}:
631 None{}
632 case DcSize{a, b}:
633 None{}
634 case DcExt{n}:
635 None{}
636 case DcSizeLf{n}:
637 None{}
638 case DcData{k}:
639 None{}
640 case DcDataCr{}:
641 None{}
642 case DcDataLf{}:
643 None{}
644 case DcTr{j}:
645 None{}
646
647def chunk.suffix(s: String) -> Maybe<&2, String>:
648 chunk.rest(dc.feed(s, dc.start(), ""))
649
650def chunk.decode.hold(h: Hold) -> Maybe<&2, String>:
651 match h:
652 case HoldMore{}:
653 None{}
654 case HoldBad{}:
655 None{}
656 case HoldUntil{b}:
657 None{}
658 case HoldBody{b}:
659 Some{b}
660
661def chunk.decode(s: String) -> Maybe<&2, String>:
662 chunk.decode.hold(chunk.live(s))
663
664def bytes.snd(r: Bytes.Bytes & Bytes.Bytes) -> Bytes.Bytes:
665 (a, b) = r
666 b
667
668def found.at(+from: U32, m: Maybe<&2, U32>) -> Maybe<&2, U32>:
669 match m:
670 case None{}:
671 None{}
672 case Some{+j}:
673 Some{(from + j : U32)}
674
675# A chunked body decoded from piece[i..]: a data run is sliced whole, and every other byte steps dc.
676type Cs is Type:
677 Cs{piece: Bytes.Bytes, i: U32, st: Dc, parts: List<&1, Bytes.Bytes>}
678
679# st: where the decoder stopped. parts: the data so far, newest first. rest: the bytes after a Done body.
680type Ck is Type:
681 Ck{st: Dc, parts: List<&1, Bytes.Bytes>, rest: Bytes.Bytes}
682
683def ck.next(+len: U32, +i: U32, +st: Dc, piece: Bytes.Bytes, parts: List<&1, Bytes.Bytes>) -> Bool & Cs:
684 (Bool.and(U32.is_lt(i, len), dc.live(st)), Cs{piece, i, st, parts})
685
686def ck.data(+len: U32, +i: U32, +k: U32, +m: U32, parts: List<&1, Bytes.Bytes>, r: Bytes.Bytes & Bytes.Bytes) -> Bool & Cs:
687 (piece, run) = r
688 ck.next(len, (i + m : U32), dc.data(k, m), piece, Con{run, parts})
689
690def ck.byte(+len: U32, +i: U32, st: Dc, parts: List<&1, Bytes.Bytes>, r: Bytes.Bytes & Maybe<&2, U32>) -> Bool & Cs:
691 (piece, m) = r
692 match m:
693 case None{}:
694 ck.next(len, i, DcBad{}, piece, parts)
695 case Some{+c}:
696 ck.next(len, (i + 1 : U32), dc.step(st, c), piece, parts)
697
698def ck.step(+len: U32, cs: Cs) -> Bool & Cs:
699 Cs{piece, +i, st, parts} = cs
700 match st:
701 case DcData{+k}:
702 +m = U32.min(k, (len - i : U32))
703 ck.data(len, i, k, m, parts, Bytes.slice(piece, i, m))
704 case DcDone{}:
705 (False{}, Cs{piece, i, DcDone{}, parts})
706 case DcBad{}:
707 (False{}, Cs{piece, i, DcBad{}, parts})
708 case DcSize{+acc, seen}:
709 ck.byte(len, i, DcSize{acc, seen}, parts, Bytes.get(piece, i))
710 case DcExt{+n}:
711 ck.byte(len, i, DcExt{n}, parts, Bytes.get(piece, i))
712 case DcSizeLf{+n}:
713 ck.byte(len, i, DcSizeLf{n}, parts, Bytes.get(piece, i))
714 case DcDataCr{}:
715 ck.byte(len, i, DcDataCr{}, parts, Bytes.get(piece, i))
716 case DcDataLf{}:
717 ck.byte(len, i, DcDataLf{}, parts, Bytes.get(piece, i))
718 case DcTr{+j}:
719 ck.byte(len, i, DcTr{j}, parts, Bytes.get(piece, i))
720
721def ck.rest(st: Dc, parts: List<&1, Bytes.Bytes>, r: Bytes.Bytes & Bytes.Bytes) -> Ck:
722 (piece, rest) = r
723 Ck{st, parts, rest}
724
725def ck.end(+len: U32, cs: Cs) -> Ck:
726 Cs{piece, +i, st, parts} = cs
727 ck.rest(st, parts, Bytes.slice(piece, i, (len - i : U32)))
728
729# Each step reads at least one byte, so len steps are enough.
730def ck.feed(f: Nat, +len: U32, r: Bool & Cs) -> Ck:
731 match f:
732 case 0n:
733 (go, cs) = r
734 ck.end(len, cs)
735 case 1n+p:
736 (go, cs) = r
737 match go:
738 case False{}:
739 ck.end(len, cs)
740 case True{}:
741 ck.feed(p, len, ck.step(len, cs))
742
743def ck(piece: Bytes.Bytes, +st: Dc, parts: List<&1, Bytes.Bytes>) -> Ck:
744 Bytes.Bytes{+len, buf} = piece
745 ck.feed(U32.to_nat(len), len, ck.next(len, 0, st, Bytes.Bytes{len, buf}, parts))
746
747def parse.res.cl.have(+rest: String, +k: Nat, short: Bool) -> Hold:
748 match short:
749 case True{}:
750 HoldMore{}
751 case False{}:
752 HoldBody{String.take(rest, k)}
753
754def parse.res.cl.k(+rest: String, +k: Nat) -> Hold:
755 parse.res.cl.have(rest, k, Nat.is_lt(String.length(rest), k))
756
757def parse.res.cl.n(rest: String, n: Maybe<&2, U32>) -> Hold:
758 match n:
759 case None{}:
760 HoldBad{}
761 case Some{k}:
762 parse.res.cl.k(rest, U32.to_nat(k))
763
764def parse.body.cl(+h: Map<&2, List<&2, String>>, rest: String, hascl: Bool) -> Hold:
765 match hascl:
766 case False{}:
767 HoldBody{""}
768 case True{}:
769 parse.res.cl.n(rest, parse_u32(header(h, "content-length")))
770
771# RFC 9112 §6.3 (4): a request coding other than chunked cannot be framed.
772def parse.body.chunked.eq(rest: String, ok: Bool) -> Hold:
773 match ok:
774 case False{}:
775 HoldBad{}
776 case True{}:
777 chunk.live(rest)
778
779def parse.body.chunked.val(te: String, rest: String) -> Hold:
780 parse.body.chunked.eq(rest, String.eq(String.to_lower(te), "chunked"))
781
782def parse.body.chunked(+h: Map<&2, List<&2, String>>, rest: String, hascl: Bool) -> Hold:
783 match hascl:
784 case True{}:
785 HoldBad{}
786 case False{}:
787 parse.body.chunked.val(header.last(h, "transfer-encoding"), rest)
788
789def parse.body.te(+h: Map<&2, List<&2, String>>, rest: String, te: Bool) -> Hold:
790 match te:
791 case True{}:
792 parse.body.chunked(h, rest, has_header(h, "content-length"))
793 case False{}:
794 parse.body.cl(h, rest, has_header(h, "content-length"))
795
796def parse.body(+h: Map<&2, List<&2, String>>, rest: String) -> Hold:
797 parse.body.te(h, rest, has_header(h, "transfer-encoding"))
798
799# Bad: never a request. More: the head is not whole; read on. Head: the head is whole
800# and valid, and the body is still coming (req.body is empty). Req: a whole request.
801type Got is Type:
802 GotBad{}
803 GotMore{}
804 GotHead{req: Req}
805 GotReq{req: Req}
806
807def parse.finish(method: String, path: String, h: Map<&2, List<&2, String>>, body: Hold) -> Got:
808 match body:
809 case HoldBad{}:
810 GotBad{}
811 case HoldMore{}:
812 GotHead{Req{method, path, h, Bytes.new(0)}}
813 case HoldUntil{b}:
814 GotBad{}
815 case HoldBody{b}:
816 GotReq{Req{method, path, h, Bytes.from_string(b)}}
817
818def parse.host(method: String, path: String, +h: Map<&2, List<&2, String>>, rest: String, has: Bool) -> Got:
819 match has:
820 case False{}:
821 GotBad{}
822 case True{}:
823 parse.finish(method, path, h, parse.body(h, rest))
824
825# RFC 9112 §3.2: only HTTP/1.1 requires Host.
826def parse.fields(method: String, path: String, rest: String, v11: Bool, fs: Maybe<&2, Map<&2, List<&2, String>>>) -> Got:
827 match fs:
828 case None{}:
829 GotBad{}
830 case Some{+h}:
831 parse.host(method, path, h, rest, Bool.or(Bool.not(v11), has_header(h, "host")))
832
833def target_ok(+p: String) -> Bool:
834 Bool.or(String.starts_with(p, "/"), Bool.or(String.eq(p, "*"), String.starts_with(p, "http://")))
835
836def parse.target(method: String, +path: String, headers: String, rest: String, v11: Bool, ok: Bool) -> Got:
837 match ok:
838 case False{}:
839 GotBad{}
840 case True{}:
841 parse.fields(method, path, rest, v11, parse.headers.raw(headers))
842
843def parse.ver(method: String, +path: String, +v: String, headers: String, rest: String, ok: Bool) -> Got:
844 match ok:
845 case False{}:
846 GotBad{}
847 case True{}:
848 parse.target(method, path, headers, rest, String.eq(v, "HTTP/1.1"), target_ok(path))
849
850def parse.empty_method(method: String, path: String, +v: String, headers: String, rest: String, empty: Bool) -> Got:
851 match empty:
852 case True{}:
853 GotBad{}
854 case False{}:
855 parse.ver(method, path, v, headers, rest, Bool.or(String.eq(v, "HTTP/1.1"), String.eq(v, "HTTP/1.0")))
856
857def parse.start3(mpv: String & String & String, headers: String, rest: String) -> Got:
858 (+method, path, v) = mpv
859 parse.empty_method(method, path, v, headers, rest, String.is_empty(method))
860
861def parse.lines(lr: String & String, rest: String) -> Got:
862 (line, headers) = lr
863 parse.start3(start_line(line), headers, rest)
864
865
866def parse.head(+head: String, rest: String, whole: Bool) -> Got:
867 match whole:
868 case False{}:
869 GotMore{}
870 case True{}:
871 parse.lines(parse.first(head, SNil{}), rest)
872
873def parse.of(hb: String & String & Bool) -> Got:
874 (head, rest, whole) = hb
875 parse.head(head, rest, whole)
876
877# serve reads until this is not GotMore.
878def parse.got(+raw: String) -> Got:
879 parse.of(split_at_blank.flag.go(raw, raw, 0n, 0, False{}))
880
881
882def parse.req(g: Got) -> Maybe<&1, Req>:
883 match g:
884 case GotReq{req}:
885 Some{req}
886 case GotBad{}:
887 None{}
888 case GotMore{}:
889 None{}
890 case GotHead{req}:
891 None{}
892
893def parse(raw: String) -> Maybe<&1, Req>:
894 parse.req(parse.got(raw))
895
896def parse.res.cl(+h: Map<&2, List<&2, String>>, rest: String, hascl: Bool) -> Hold:
897 match hascl:
898 case False{}:
899 HoldBody{rest}
900 case True{}:
901 parse.res.cl.n(rest, parse_u32(header(h, "content-length")))
902
903def parse.res.chunked.eq(rest: String, ok: Bool) -> Hold:
904 match ok:
905 case False{}:
906 HoldUntil{rest}
907 case True{}:
908 chunk.live(rest)
909
910def parse.res.chunked.val(te: String, rest: String) -> Hold:
911 parse.res.chunked.eq(rest, String.eq(String.to_lower(te), "chunked"))
912
913def parse.res.chunked(+h: Map<&2, List<&2, String>>, rest: String, hascl: Bool) -> Hold:
914 match hascl:
915 case True{}:
916 HoldBad{}
917 case False{}:
918 parse.res.chunked.val(header.last(h, "transfer-encoding"), rest)
919
920def parse.res.te(+h: Map<&2, List<&2, String>>, rest: String, te: Bool) -> Hold:
921 match te:
922 case True{}:
923 parse.res.chunked(h, rest, has_header(h, "content-length"))
924 case False{}:
925 parse.res.cl(h, rest, has_header(h, "content-length"))
926
927def parse.res.body(+h: Map<&2, List<&2, String>>, rest: String) -> Hold:
928 parse.res.te(h, rest, has_header(h, "transfer-encoding"))
929
930# Bad: never a message. More: a valid prefix; read on. Done: a whole response.
931type Frame is Type:
932 FrameBad{}
933 FrameMore{}
934 FrameDone{res: Res}
935
936# RFC 9112 §8: a message cut short by close is incomplete, not valid.
937def frame.cut(closed: Bool) -> Frame:
938 match closed:
939 case True{}:
940 FrameBad{}
941 case False{}:
942 FrameMore{}
943
944def frame.wait(res: Res, wait: Bool) -> Frame:
945 match wait:
946 case True{}:
947 FrameMore{}
948 case False{}:
949 FrameDone{res}
950
951def frame.done(status: U32, h: Map<&2, List<&2, String>>, body: Hold, +closed: Bool, open: Bool) -> Frame:
952 match body:
953 case HoldBad{}:
954 FrameBad{}
955 case HoldMore{}:
956 frame.cut(closed)
957 case HoldUntil{b}:
958 frame.wait(Res{status, h, Bytes.from_string(b)}, Bool.not(closed))
959 case HoldBody{b}:
960 frame.wait(Res{status, h, Bytes.from_string(b)}, Bool.and(open, Bool.not(closed)))
961
962# RFC 9112 §6.3 (8): no TE and no CL ⇒ the body runs until the server closes.
963def frame.open(+h: Map<&2, List<&2, String>>) -> Bool:
964 Bool.not(Bool.or(has_header(h, "transfer-encoding"), has_header(h, "content-length")))
965
966# RFC 9112 §6.3 (1): HEAD, 1xx, 204 and 304 responses end at the blank line.
967def frame.nobody(+status: U32, head: Bool) -> Bool:
968 Bool.or(head, Bool.or(U32.is_lt(status, 200), Bool.or(U32.is_eq(status, 204), U32.is_eq(status, 304))))
969
970# 101 is the final response. Other 1xx are interim; a final response follows.
971def frame.interim(+status: U32) -> Bool:
972 Bool.and(U32.is_lt(status, 200), Bool.not(U32.is_eq(status, 101)))
973
974def frame.status(status: U32, +h: Map<&2, List<&2, String>>, rest: String, closed: Bool, nobody: Bool) -> Frame:
975 match nobody:
976 case True{}:
977 FrameDone{Res{status, h, Bytes.new(0)}}
978 case False{}:
979 frame.done(status, h, parse.res.body(h, rest), closed, frame.open(h))
980
981def parse.res.fields(+status: U32, rest: String, fs: Maybe<&2, Map<&2, List<&2, String>>>, closed: Bool, head: Bool) -> Frame:
982 match fs:
983 case None{}:
984 FrameBad{}
985 case Some{h}:
986 frame.status(status, h, rest, closed, frame.nobody(status, head))
987
988def parse.res.num(code: Maybe<&2, U32>, headers: String, rest: String, closed: Bool, head: Bool) -> Frame:
989 match code:
990 case None{}:
991 FrameBad{}
992 case Some{n}:
993 parse.res.fields(n, rest, parse.headers.raw(headers), closed, head)
994
995def parse.res.ver(code: String, headers: String, rest: String, closed: Bool, head: Bool, ok: Bool) -> Frame:
996 match ok:
997 case False{}:
998 FrameBad{}
999 case True{}:
1000 parse.res.num(parse_u32(code), headers, rest, closed, head)
1001
1002def parse.res.start3(mpv: String & String & String, headers: String, rest: String, closed: Bool, head: Bool) -> Frame:
1003 (+ver, code, reason) = mpv
1004 parse.res.ver(code, headers, rest, closed, head, Bool.or(String.eq(ver, "HTTP/1.1"), String.eq(ver, "HTTP/1.0")))
1005
1006def parse.res.lines(lr: String & String, rest: String, closed: Bool, head: Bool) -> Frame:
1007 (line, headers) = lr
1008 parse.res.start3(start_line(line), headers, rest, closed, head)
1009
1010def parse.res.blank(hd: String, rest: String, +closed: Bool, head: Bool, ok: Bool) -> Frame:
1011 match ok:
1012 case False{}:
1013 frame.cut(closed)
1014 case True{}:
1015 parse.res.lines(parse.first(hd, SNil{}), rest, closed, head)
1016
1017def parse.res.of(hb: String & String, closed: Bool, head: Bool) -> Frame:
1018 (+hd, rest) = hb
1019 parse.res.blank(hd, rest, closed, head, blank_end(hd))
1020
1021type Lead is Data:
1022 LeadCut{}
1023 LeadFinal{}
1024 LeadSkip{+rest: String}
1025
1026def frame.lead.if(rest: String, interim: Bool) -> Lead:
1027 match interim:
1028 case True{}:
1029 LeadSkip{rest}
1030 case False{}:
1031 LeadFinal{}
1032
1033def frame.lead.num(n: Maybe<&2, U32>, rest: String) -> Lead:
1034 match n:
1035 case None{}:
1036 LeadFinal{}
1037 case Some{s}:
1038 frame.lead.if(rest, frame.interim(s))
1039
1040def frame.lead.code(mpv: String & String & String, rest: String) -> Lead:
1041 (ver, code, reason) = mpv
1042 frame.lead.num(parse_u32(code), rest)
1043
1044def frame.lead.lines(xs: List<&2, String>, rest: String) -> Lead:
1045 match xs:
1046 case Nil{}:
1047 LeadFinal{}
1048 case Con{line, headers}:
1049 frame.lead.code(start_line(line), rest)
1050
1051def frame.lead.blank(+hd: String, rest: String, ok: Bool) -> Lead:
1052 match ok:
1053 case False{}:
1054 LeadCut{}
1055 case True{}:
1056 frame.lead.lines(String.lines(hd), rest)
1057
1058def frame.lead(hb: String & String) -> Lead:
1059 (+hd, rest) = hb
1060 frame.lead.blank(hd, rest, blank_end(hd))
1061
1062def frame.at.cont(+raw: String, lead: Lead) -> String:
1063 match lead:
1064 case LeadCut{}:
1065 raw
1066 case LeadFinal{}:
1067 raw
1068 case LeadSkip{rest}:
1069 rest
1070
1071def frame.at.zero.go(+raw: String, closed: Bool, head: Bool, lead: Lead) -> Frame:
1072 match lead:
1073 case LeadCut{}:
1074 frame.cut(closed)
1075 case LeadFinal{}:
1076 parse.res.of(split_at_blank(raw), closed, head)
1077 case LeadSkip{rest}:
1078 FrameBad{}
1079
1080def frame.at.zero.of(+raw: String, closed: Bool, head: Bool) -> Frame:
1081 frame.at.zero.go(raw, closed, head, frame.lead(split_at_blank(raw)))
1082
1083def frame.at.pos.do(f: Nat, +raw: String, closed: Bool, head: Bool, hb: String & String, lead: Lead) -> Frame:
1084 match f:
1085 case 0n:
1086 match lead:
1087 case LeadCut{}:
1088 frame.cut(closed)
1089 case LeadFinal{}:
1090 parse.res.of(hb, closed, head)
1091 case LeadSkip{+rest}:
1092 frame.at.zero.of(rest, closed, head)
1093 case 1n+g:
1094 match lead:
1095 case LeadCut{}:
1096 frame.cut(closed)
1097 case LeadFinal{}:
1098 parse.res.of(hb, closed, head)
1099 case LeadSkip{+rest}:
1100 frame.at.pos.do(g, rest, closed, head, split_at_blank(rest), frame.lead(split_at_blank(rest)))
1101
1102def frame.at.zero(+raw: String, closed: Bool, head: Bool) -> Frame:
1103 frame.at.zero.of(raw, closed, head)
1104
1105# ponytail: 8 interim responses; raise the fuel if a server sends more
1106def frame.at(fuel: Nat, +raw: String, closed: Bool, head: Bool) -> Frame:
1107 match fuel:
1108 case 0n:
1109 frame.at.zero(raw, closed, head)
1110 case 1n+f:
1111 frame.at.pos.do(f, raw, closed, head, split_at_blank(raw), frame.lead(split_at_blank(raw)))
1112
1113# frame(bytes so far, server closed?, request was HEAD?)
1114def frame(raw: String, closed: Bool, head: Bool) -> Frame:
1115 frame.at(8n, raw, closed, head)
1116
1117def frame.res(f: Frame) -> Maybe<&1, Res>:
1118 match f:
1119 case FrameDone{res}:
1120 Some{res}
1121 case FrameBad{}:
1122 None{}
1123 case FrameMore{}:
1124 None{}
1125
1126def parse_res(raw: String) -> Maybe<&1, Res>:
1127 frame.res(frame(raw, True{}, False{}))
1128
1129def res_fields.res(res: Res, k: String) -> List<&2, String>:
1130 Res{status, headers, body} = res
1131 fields(headers, k)
1132
1133def res_fields(m: Maybe<&1, Res>, k: String) -> List<&2, String>:
1134 match m:
1135 case None{}:
1136 Nil{}
1137 case Some{res}:
1138 res_fields.res(res, k)
1139
1140# The response body as it arrives. Len: bytes left. Chunk: the decoder. Close: until the
1141# server closes. Done: the body is whole. Bad: it cannot become a body.
1142type Rb is Data:
1143 RbLen{left: U32}
1144 RbChunk{st: Dc}
1145 RbClose{}
1146 RbDone{}
1147 RbBad{}
1148
1149def rb.cl(n: Maybe<&2, U32>) -> Maybe<&2, Rb>:
1150 match n:
1151 case None{}:
1152 None{}
1153 case Some{+k}:
1154 Some{Bool.pick(Rb, U32.is_zero(k), RbDone{}, RbLen{k})}
1155
1156def rb.te(+h: Map<&2, List<&2, String>>, cl: Bool) -> Maybe<&2, Rb>:
1157 match cl:
1158 case True{}:
1159 None{}
1160 case False{}:
1161 Some{Bool.pick(Rb, String.eq(String.to_lower(header.last(h, "transfer-encoding")), "chunked"), RbChunk{dc.start()}, RbClose{})}
1162
1163def rb.len(+h: Map<&2, List<&2, String>>, te: Bool) -> Maybe<&2, Rb>:
1164 match te:
1165 case True{}:
1166 rb.te(h, has_header(h, "content-length"))
1167 case False{}:
1168 Bool.pick(Maybe<&2, Rb>, has_header(h, "content-length"), rb.cl(parse_u32(header(h, "content-length"))), Some{RbClose{}})
1169
1170# RFC 9112 §6.3: how the body of this response ends. None: it cannot be framed.
1171def rb.of(+h: Map<&2, List<&2, String>>, nobody: Bool) -> Maybe<&2, Rb>:
1172 match nobody:
1173 case True{}:
1174 Some{RbDone{}}
1175 case False{}:
1176 rb.len(h, has_header(h, "transfer-encoding"))
1177
1178# rb: how the body goes on. parts: body bytes so far, newest first. rest: bytes past a Done body.
1179type Bf is Type:
1180 Bf{rb: Rb, parts: List<&1, Bytes.Bytes>, rest: Bytes.Bytes}
1181
1182def rb.len.cut(parts: List<&1, Bytes.Bytes>, +len: U32, +left: U32, r: Bytes.Bytes & Bytes.Bytes) -> Bf:
1183 (piece, data) = r
1184 Bf{RbDone{}, Con{data, parts}, bytes.snd(Bytes.slice(piece, left, (len - left : U32)))}
1185
1186def rb.len.have(short: Bool, +left: U32, parts: List<&1, Bytes.Bytes>, +len: U32, piece: Bytes.Bytes) -> Bf:
1187 match short:
1188 case True{}:
1189 Bf{RbLen{(left - len : U32)}, Con{piece, parts}, Bytes.new(0)}
1190 case False{}:
1191 rb.len.cut(parts, len, left, Bytes.slice(piece, 0, left))
1192
1193def rb.chunk(c: Ck) -> Bf:
1194 Ck{st, parts, rest} = c
1195 match st:
1196 case DcDone{}:
1197 Bf{RbDone{}, parts, rest}
1198 case DcBad{}:
1199 Bf{RbBad{}, parts, rest}
1200 case DcSize{a, b}:
1201 Bf{RbChunk{DcSize{a, b}}, parts, rest}
1202 case DcExt{x}:
1203 Bf{RbChunk{DcExt{x}}, parts, rest}
1204 case DcSizeLf{x}:
1205 Bf{RbChunk{DcSizeLf{x}}, parts, rest}
1206 case DcData{k}:
1207 Bf{RbChunk{DcData{k}}, parts, rest}
1208 case DcDataCr{}:
1209 Bf{RbChunk{DcDataCr{}}, parts, rest}
1210 case DcDataLf{}:
1211 Bf{RbChunk{DcDataLf{}}, parts, rest}
1212 case DcTr{j}:
1213 Bf{RbChunk{DcTr{j}}, parts, rest}
1214
1215# The body bytes in piece, added to parts.
1216def rb.feed(rb: Rb, parts: List<&1, Bytes.Bytes>, piece: Bytes.Bytes) -> Bf:
1217 match rb:
1218 case RbLen{+left}:
1219 Bytes.Bytes{+len, buf} = piece
1220 rb.len.have(U32.is_lt(len, left), left, parts, len, Bytes.Bytes{len, buf})
1221 case RbChunk{st}:
1222 rb.chunk(ck(piece, st, parts))
1223 case RbClose{}:
1224 Bf{RbClose{}, Con{piece, parts}, Bytes.new(0)}
1225 case RbDone{}:
1226 Bf{RbDone{}, parts, piece}
1227 case RbBad{}:
1228 Bf{RbBad{}, parts, piece}
1229
1230# RFC 9112 §8: only a close-delimited body may end at close.
1231def rb.eof(rb: Rb) -> Bool:
1232 match rb:
1233 case RbClose{}:
1234 True{}
1235 case RbDone{}:
1236 True{}
1237 case RbLen{n}:
1238 False{}
1239 case RbChunk{st}:
1240 False{}
1241 case RbBad{}:
1242 False{}
1243
1244def rb.body(parts: List<&1, Bytes.Bytes>) -> Bytes.Bytes:
1245 Bytes.concat(List.reverse(&1, Bytes.Bytes, parts))
1246
1247# The head scan. Seek: look for the blank line from byte from; k interim heads are behind.
1248# Wait: no blank line yet. Res: the final head, how its body ends, and the bytes after it.
1249type Hs is Type:
1250 HsSeek{buf: Bytes.Bytes, from: U32, k: U32}
1251 HsWait{buf: Bytes.Bytes, k: U32}
1252 HsBad{}
1253 HsRes{res: Res, rb: Rb, rest: Bytes.Bytes}
1254
1255def hs.final(+status: U32, +h: Map<&2, List<&2, String>>, rest: Bytes.Bytes, m: Maybe<&2, Rb>) -> Hs:
1256 match m:
1257 case None{}:
1258 HsBad{}
1259 case Some{rb}:
1260 HsRes{Res{status, h, Bytes.new(0)}, rb, rest}
1261
1262def hs.skip(more: Bool, +k: U32, rest: Bytes.Bytes) -> Hs:
1263 match more:
1264 case True{}:
1265 HsSeek{rest, 0, (k + 1 : U32)}
1266 case False{}:
1267 HsBad{}
1268
1269def hs.pick(interim: Bool, +head: Bool, +k: U32, +status: U32, +h: Map<&2, List<&2, String>>, rest: Bytes.Bytes) -> Hs:
1270 match interim:
1271 case True{}:
1272 hs.skip(U32.is_lt(k, 8), k, rest)
1273 case False{}:
1274 hs.final(status, h, rest, rb.of(h, frame.nobody(status, head)))
1275
1276def hs.res(+head: Bool, +k: U32, rest: Bytes.Bytes, res: Res) -> Hs:
1277 Res{+status, +h, body} = res
1278 hs.pick(frame.interim(status), head, k, status, h, rest)
1279
1280# The head alone, framed as a HEAD response so it stops at the blank line.
1281def hs.parsed(+head: Bool, +k: U32, rest: Bytes.Bytes, f: Frame) -> Hs:
1282 match f:
1283 case FrameDone{res}:
1284 hs.res(head, k, rest, res)
1285 case FrameBad{}:
1286 HsBad{}
1287 case FrameMore{}:
1288 HsBad{}
1289
1290def hs.split(+head: Bool, +k: U32, +hlen: U32, +len: U32, r: Bytes.Bytes & Bytes.Bytes) -> Hs:
1291 (buf, hb) = r
1292 hs.parsed(head, k, bytes.snd(Bytes.slice(buf, hlen, (len - hlen : U32))), parse.res.of(split_at_blank(Bytes.to_string(hb)), False{}, True{}))
1293
1294def hs.hit(+head: Bool, +k: U32, +len: U32, buf: Bytes.Bytes, at: Maybe<&2, U32>) -> Hs:
1295 match at:
1296 case None{}:
1297 HsWait{buf, k}
1298 case Some{+i}:
1299 +hlen = (i + 4 : U32)
1300 hs.split(head, k, hlen, len, Bytes.slice(buf, 0, hlen))
1301
1302def hs.seek.of(+head: Bool, +k: U32, +len: U32, +from: U32, buf: Bytes.Bytes, r: Bytes.Bytes & Maybe<&2, U32>) -> Hs:
1303 (tail, m) = r
1304 hs.hit(head, k, len, buf, found.at(from, m))
1305
1306def hs.seek(+head: Bool, +k: U32, +len: U32, +from: U32, r: Bytes.Bytes & Bytes.Bytes) -> Hs:
1307 (buf, tail) = r
1308 hs.seek.of(head, k, len, from, buf, Bytes.find(tail, "\r\n\r\n"))
1309
1310def hs.step(+head: Bool, st: Hs) -> Hs:
1311 match st:
1312 case HsSeek{buf, +from, +k}:
1313 Bytes.Bytes{+len, b} = buf
1314 hs.seek(head, k, len, from, Bytes.slice(Bytes.Bytes{len, b}, from, (len - from : U32)))
1315 case HsWait{buf, k}:
1316 HsWait{buf, k}
1317 case HsBad{}:
1318 HsBad{}
1319 case HsRes{res, rb, rest}:
1320 HsRes{res, rb, rest}
1321
1322# Each step ends the scan or passes one interim head, and at most 8 interim heads pass.
1323def hs.scan(fuel: Nat, +head: Bool, st: Hs) -> Hs:
1324 match fuel:
1325 case 0n:
1326 match st:
1327 case HsSeek{buf, from, k}:
1328 HsBad{}
1329 case HsWait{buf, k}:
1330 HsWait{buf, k}
1331 case HsBad{}:
1332 HsBad{}
1333 case HsRes{res, rb, rest}:
1334 HsRes{res, rb, rest}
1335 case 1n+f:
1336 hs.scan(f, head, hs.step(head, st))
1337
1338# piece joins buf; only the new bytes, and the 3 before them, can finish the blank line.
1339def hs.more(+head: Bool, +k: U32, buf: Bytes.Bytes, piece: Bytes.Bytes) -> Hs:
1340 Bytes.Bytes{+ol, ob} = buf
1341 hs.scan(10n, head, HsSeek{Bytes.append(Bytes.Bytes{ol, ob}, piece), Bool.pick(U32, U32.is_lt(ol, 3), 0, (ol - 3 : U32)), k})
1342
1343# Untrusted servers must not grow the buffer without bound.
1344def fetch.max() -> Nat:
1345 U32.to_nat(16777216)
1346
1347# A response read in pieces. Head: the head is not whole yet. Body: it is, and parts is the body so far.
1348# Len: a Content-Length body in one buffer of that size, with left bytes still to come.
1349type Rv is Type:
1350 RvHead{buf: Bytes.Bytes, k: U32}
1351 RvBody{res: Res, rb: Rb, parts: List<&1, Bytes.Bytes>}
1352 RvLen{res: Res, left: U32, body: Bytes.Bytes}
1353
1354# More: read on. Done: the response, and the bytes after it when the body is self-delimited.
1355type Rt is Type:
1356 RtMore{rv: Rv}
1357 RtBad{}
1358 RtDone{res: Res, rest: Maybe<&1, Bytes.Bytes>}
1359
1360def rv.start() -> Rv:
1361 RvHead{Bytes.new(0), 0}
1362
1363def rv.whole(res: Res, b: Bytes.Bytes, rest: Maybe<&1, Bytes.Bytes>) -> Rt:
1364 Res{status, headers, body} = res
1365 RtDone{Res{status, headers, b}, rest}
1366
1367def rv.done(res: Res, parts: List<&1, Bytes.Bytes>, rest: Maybe<&1, Bytes.Bytes>) -> Rt:
1368 rv.whole(res, rb.body(parts), rest)
1369
1370def rl.put.of(+total: U32, +len: U32, r: Array<U32> & Array<U32>) -> Bytes.Bytes & Bytes.Bytes:
1371 (src, dst) = r
1372 (Bytes.Bytes{total, dst}, Bytes.Bytes{len, src})
1373
1374# The first m bytes of piece, written into body after the total - left bytes already there.
1375def rl.put(+m: U32, +left: U32, body: Bytes.Bytes, piece: Bytes.Bytes) -> Bytes.Bytes & Bytes.Bytes:
1376 Bytes.Bytes{+total, dst} = body
1377 Bytes.Bytes{+len, src} = piece
1378 rl.put.of(total, len, Bytes.copy(m, src, dst, 0, (total - left : U32)))
1379
1380def rl.fed(short: Bool, res: Res, +left: U32, +len: U32, r: Bytes.Bytes & Bytes.Bytes) -> Rt:
1381 match short:
1382 case True{}:
1383 (body, piece) = r
1384 RtMore{RvLen{res, (left - len : U32), body}}
1385 case False{}:
1386 (body, piece) = r
1387 rv.whole(res, body, Some{bytes.snd(Bytes.slice(piece, left, (len - left : U32)))})
1388
1389def rl.feed(res: Res, +left: U32, body: Bytes.Bytes, piece: Bytes.Bytes) -> Rt:
1390 Bytes.Bytes{+len, buf} = piece
1391 rl.fed(U32.is_lt(len, left), res, left, len, rl.put(U32.min(len, left), left, body, Bytes.Bytes{len, buf}))
1392
1393def rv.fed(res: Res, bf: Bf) -> Rt:
1394 Bf{rb, parts, rest} = bf
1395 match rb:
1396 case RbDone{}:
1397 rv.done(res, parts, Some{rest})
1398 case RbBad{}:
1399 RtBad{}
1400 case RbLen{n}:
1401 RtMore{RvBody{res, RbLen{n}, parts}}
1402 case RbChunk{st}:
1403 RtMore{RvBody{res, RbChunk{st}, parts}}
1404 case RbClose{}:
1405 RtMore{RvBody{res, RbClose{}, parts}}
1406
1407# Some{left}: a Content-Length body small enough to allocate up front. Larger ones fail at the fetch cap.
1408def rb.buf(rb: Rb) -> Maybe<&2, U32>:
1409 match rb:
1410 case RbLen{+left}:
1411 Bool.pick(Maybe<&2, U32>, Nat.is_lt(fetch.max(), U32.to_nat(left)), None{}, Some{left})
1412 case RbChunk{st}:
1413 None{}
1414 case RbClose{}:
1415 None{}
1416 case RbDone{}:
1417 None{}
1418 case RbBad{}:
1419 None{}
1420
1421def rv.body(m: Maybe<&2, U32>, res: Res, rb: Rb, rest: Bytes.Bytes) -> Rt:
1422 match m:
1423 case None{}:
1424 rv.fed(res, rb.feed(rb, Nil{}, rest))
1425 case Some{+left}:
1426 rl.feed(res, left, Bytes.new(left), rest)
1427
1428def rv.head(hs: Hs) -> Rt:
1429 match hs:
1430 case HsWait{buf, k}:
1431 RtMore{RvHead{buf, k}}
1432 case HsBad{}:
1433 RtBad{}
1434 case HsSeek{buf, from, k}:
1435 RtBad{}
1436 case HsRes{res, +rb, rest}:
1437 rv.body(rb.buf(rb), res, rb, rest)
1438
1439def rv.eof(res: Res, parts: List<&1, Bytes.Bytes>, ok: Bool) -> Rt:
1440 match ok:
1441 case True{}:
1442 rv.done(res, parts, None{})
1443 case False{}:
1444 RtBad{}
1445
1446# One read: piece, or the server closed (RFC 9112 §8: a message cut short is not a message).
1447def rv.step(closed: Bool, +head: Bool, rv: Rv, piece: Bytes.Bytes) -> Rt:
1448 match closed:
1449 case True{}:
1450 match rv:
1451 case RvHead{buf, k}:
1452 RtBad{}
1453 case RvBody{res, rb, parts}:
1454 rv.eof(res, parts, rb.eof(rb))
1455 case RvLen{res, left, body}:
1456 RtBad{}
1457 case False{}:
1458 match rv:
1459 case RvHead{buf, +k}:
1460 rv.head(hs.more(head, k, buf, piece))
1461 case RvBody{res, rb, parts}:
1462 rv.fed(res, rb.feed(rb, parts, piece))
1463 case RvLen{res, +left, body}:
1464 rl.feed(res, left, body, piece)
1465
1466def rv.end(closed: Bool, +head: Bool, t: Rt) -> Rt:
1467 match closed:
1468 case False{}:
1469 t
1470 case True{}:
1471 match t:
1472 case RtMore{rv}:
1473 rv.step(True{}, head, rv, Bytes.new(0))
1474 case RtBad{}:
1475 RtBad{}
1476 case RtDone{res, rest}:
1477 RtDone{res, rest}
1478
1479def rv.go(xs: List<&2, String>, closed: Bool, +head: Bool, t: Rt) -> Rt:
1480 match xs:
1481 case Nil{}:
1482 rv.end(closed, head, t)
1483 case Con{+x, rest}:
1484 match t:
1485 case RtMore{rv}:
1486 rv.go(rest, closed, head, rv.step(False{}, head, rv, Bytes.from_string(x)))
1487 case RtBad{}:
1488 RtBad{}
1489 case RtDone{res, r}:
1490 RtDone{res, r}
1491
1492def rt.frame(t: Rt) -> Frame:
1493 match t:
1494 case RtMore{rv}:
1495 FrameMore{}
1496 case RtBad{}:
1497 FrameBad{}
1498 case RtDone{res, rest}:
1499 FrameDone{res}
1500
1501# What the read loop makes of these pieces, then a close when closed is set.
1502def res.frame(xs: List<&2, String>, closed: Bool, +head: Bool) -> Frame:
1503 rt.frame(rv.go(xs, closed, head, RtMore{rv.start()}))
1504
1505def rt.rest(t: Rt) -> Maybe<&1, Bytes.Bytes>:
1506 match t:
1507 case RtMore{rv}:
1508 None{}
1509 case RtBad{}:
1510 None{}
1511 case RtDone{res, rest}:
1512 rest
1513
1514def after.of(m: Maybe<&1, Bytes.Bytes>) -> Maybe<&2, String>:
1515 match m:
1516 case None{}:
1517 None{}
1518 case Some{b}:
1519 Some{Bytes.to_string(b)}
1520
1521# Bytes after a complete self-delimited message. None if it is not one yet.
1522def after(+raw: String, +head: Bool) -> Maybe<&2, String>:
1523 after.of(rt.rest(rv.go([raw], False{}, head, RtMore{rv.start()})))
1524
1525def req.v11.ver(mpv: String & String & String) -> Bool:
1526 (+method, path, v) = mpv
1527 String.eq(v, "HTTP/1.1")
1528
1529def req.v11.line(+line: String) -> Bool:
1530 req.v11.ver(start_line(line))
1531
1532def req.v11.lines(xs: List<&2, String>) -> Bool:
1533 match xs:
1534 case Nil{}:
1535 False{}
1536 case Con{line, headers}:
1537 req.v11.line(line)
1538
1539def req.v11.pick(+head: String, ok: Bool) -> Bool:
1540 match ok:
1541 case False{}:
1542 False{}
1543 case True{}:
1544 req.v11.lines(String.lines(head))
1545
1546def req.v11.of(hb: String & String) -> Bool:
1547 (+head, rest) = hb
1548 req.v11.pick(head, blank_end(head))
1549
1550def req.v11(+raw: String) -> Bool:
1551 req.v11.of(split_at_blank(raw))
1552
1553def req.conn_close(+headers: Map<&2, List<&2, String>>) -> Bool:
1554 String.eq(String.to_lower(header(headers, "connection")), "close")
1555
1556def res.conn_close(+headers: Map<&2, List<&2, String>>) -> Bool:
1557 String.eq(String.to_lower(header(headers, "connection")), "close")
1558
1559def serve.fail_close(+status: U32) -> Bool:
1560 Bool.or(U32.is_eq(status, 400), Bool.or(U32.is_eq(status, 413), U32.is_eq(status, 431)))
1561
1562def serve.keep.ok(fail: Bool, res_close: Bool) -> Bool:
1563 match fail:
1564 case True{}:
1565 False{}
1566 case False{}:
1567 Bool.not(res_close)
1568
1569def serve.keep.v11(v11: Bool, +req_close: Bool, +status: U32, res_close: Bool) -> Bool:
1570 match v11:
1571 case False{}:
1572 False{}
1573 case True{}:
1574 match req_close:
1575 case True{}:
1576 False{}
1577 case False{}:
1578 serve.keep.ok(serve.fail_close(status), res_close)
1579
1580def serve.keep(+headers: Map<&2, List<&2, String>>, v11: Bool, +status: U32, +res: Map<&2, List<&2, String>>) -> Bool:
1581 serve.keep.v11(v11, req.conn_close(headers), status, res.conn_close(res))
1582
1583
1584def again.keep(close: Bool, x: Bytes.Bytes) -> Maybe<&1, Bytes.Bytes>:
1585 match close:
1586 case True{}:
1587 None{}
1588 case False{}:
1589 Some{x}
1590
1591def again.rest(close: Bool, rest: Maybe<&1, Bytes.Bytes>) -> Maybe<&1, Bytes.Bytes>:
1592 match rest:
1593 case None{}:
1594 None{}
1595 case Some{x}:
1596 again.keep(close, x)
1597
1598# The bytes past the response when the socket can take another request: the request did not
1599# ask to close, the response is self-delimited, and the peer did not say close.
1600def again(close: Bool, +h: Map<&2, List<&2, String>>, rest: Maybe<&1, Bytes.Bytes>) -> Maybe<&1, Bytes.Bytes>:
1601 match close:
1602 case True{}:
1603 None{}
1604 case False{}:
1605 again.rest(String.eq(String.to_lower(header(h, "connection")), "close"), rest)
1606
1607def res_body.res(res: Res) -> Bytes.Bytes:
1608 Res{status, headers, body} = res
1609 body
1610
1611def res_body(m: Maybe<&1, Res>) -> Bytes.Bytes:
1612 match m:
1613 case None{}:
1614 Bytes.new(0)
1615 case Some{res}:
1616 res_body.res(res)
1617
1618def text(res: Res) -> String:
1619 Enc.utf8.decode(res_body.res(res))
1620
1621# UTF-8 is checked, not repaired: bad UTF-8 in a string gives None (RFC 8259 §8.1).
1622def json(res: Res) -> Maybe<&1, Json.Val>:
1623 Json.parse.bytes(res_body.res(res))
1624
1625def got_body.req(req: Req) -> Bytes.Bytes:
1626 Req{method, path, headers, body} = req
1627 body
1628
1629def got_body(m: Maybe<&1, Req>) -> Bytes.Bytes:
1630 match m:
1631 case None{}:
1632 Bytes.new(0)
1633 case Some{req}:
1634 got_body.req(req)
1635
1636def body.of(hb: String & String) -> String:
1637 (h, b) = hb
1638 b
1639
1640def body(s: String) -> String:
1641 body.of(split_at_blank.go(s, False{}, 0, SNil{}))
1642
1643def headers_lines(+k: String, vs: List<&2, String>, acc: String) -> String:
1644 match vs:
1645 case Nil{}:
1646 acc
1647 case Con{v, t}:
1648 headers_lines(k, t, acc ++ ("\r\n" ++ sanitize(k) ++ ": " ++ sanitize(v)))
1649
1650def headers_block.go(xs: List<&2, Sigma<&2, &2, String, _ => List<&2, String>>>, acc: String) -> String:
1651 match xs:
1652 case Nil{}:
1653 acc
1654 case (k, vs) <> t:
1655 headers_block.go(t, headers_lines(k, vs, acc))
1656
1657def headers_block(h: Map<&2, List<&2, String>>) -> String:
1658 headers_block.go(Map.to_list(&2, List<&2, String>, h), "")
1659
1660# RFC 9110 §15. An unknown code gets an empty reason, which RFC 9112 §4 allows.
1661type Reason is Data:
1662 Reason{code: U32, text: String}
1663
1664def reasons() -> List<&2, Reason>:
1665 [Reason{100, "Continue"}, Reason{101, "Switching Protocols"}, Reason{103, "Early Hints"},
1666 Reason{200, "OK"}, Reason{201, "Created"}, Reason{202, "Accepted"}, Reason{203, "Non-Authoritative Information"}, Reason{204, "No Content"}, Reason{205, "Reset Content"}, Reason{206, "Partial Content"},
1667 Reason{300, "Multiple Choices"}, Reason{301, "Moved Permanently"}, Reason{302, "Found"}, Reason{303, "See Other"}, Reason{304, "Not Modified"}, Reason{307, "Temporary Redirect"}, Reason{308, "Permanent Redirect"},
1668 Reason{400, "Bad Request"}, Reason{401, "Unauthorized"}, Reason{402, "Payment Required"}, Reason{403, "Forbidden"}, Reason{404, "Not Found"}, Reason{405, "Method Not Allowed"}, Reason{406, "Not Acceptable"}, Reason{407, "Proxy Authentication Required"}, Reason{408, "Request Timeout"}, Reason{409, "Conflict"}, Reason{410, "Gone"}, Reason{411, "Length Required"}, Reason{412, "Precondition Failed"}, Reason{413, "Content Too Large"}, Reason{414, "URI Too Long"}, Reason{415, "Unsupported Media Type"}, Reason{416, "Range Not Satisfiable"}, Reason{417, "Expectation Failed"}, Reason{421, "Misdirected Request"}, Reason{422, "Unprocessable Content"}, Reason{426, "Upgrade Required"}, Reason{428, "Precondition Required"}, Reason{429, "Too Many Requests"}, Reason{431, "Request Header Fields Too Large"},
1669 Reason{500, "Internal Server Error"}, Reason{501, "Not Implemented"}, Reason{502, "Bad Gateway"}, Reason{503, "Service Unavailable"}, Reason{504, "Gateway Timeout"}, Reason{505, "HTTP Version Not Supported"}]
1670
1671def reason.go(xs: List<&2, Reason>, +status: U32) -> String:
1672 match xs:
1673 case Nil{}:
1674 ""
1675 case Con{Reason{k, v}, t}:
1676 Bool.pick(String, U32.is_eq(k, status), v, reason.go(t, status))
1677
1678def reason(+status: U32) -> String:
1679 reason.go(reasons(), status)
1680
1681def response(+status: U32, headers: Map<&2, List<&2, String>>, body: String) -> String:
1682 ("HTTP/1.1 " ++ U32.show(status) ++ " " ++ reason(status) ++ headers_block(headers)) ++ ("\r\n\r\n" ++ body)
1683
1684def encode.body(head: Bool, top: Bytes.Bytes, body: Bytes.Bytes) -> Bytes.Bytes:
1685 match head:
1686 case True{}:
1687 top
1688 case False{}:
1689 Bytes.append(top, body)
1690
1691def encode.len(+status: U32, headers: Map<&2, List<&2, String>>, head: Bool, body: Bytes.Bytes) -> Bytes.Bytes:
1692 Bytes.Bytes{+len, buf} = body
1693 encode.body(head, Bytes.from_string(response(status, set(headers, "content-length", U32.show(len)), "")), Bytes.Bytes{len, buf})
1694
1695# RFC 9110 §6.4.1, §8.6: 1xx, 204 and 304 have no body; HEAD gets the length but no body.
1696def encode.pick(+status: U32, headers: Map<&2, List<&2, String>>, body: Bytes.Bytes, head: Bool, nobody: Bool) -> Bytes.Bytes:
1697 match nobody:
1698 case True{}:
1699 Bytes.from_string(response(status, headers, ""))
1700 case False{}:
1701 encode.len(status, headers, head, body)
1702
1703def encode.on(r: Res, head: Bool) -> Bytes.Bytes:
1704 Res{+status, headers, body} = r
1705 encode.pick(status, headers, body, head, frame.nobody(status, False{}))
1706
1707def encode(r: Res) -> Bytes.Bytes:
1708 encode.on(r, False{})
1709
1710def request(method: String, path: String, headers: Map<&2, List<&2, String>>, body: String) -> String:
1711 (method ++ " " ++ path ++ " HTTP/1.1" ++ headers_block(headers)) ++ ("\r\n\r\n" ++ body)
1712
1713def req.reserved(+k: String) -> Bool:
1714 Bool.or(Bool.or(String.eq(k, "host"), String.eq(k, "connection")), Bool.or(String.eq(k, "content-length"), String.eq(k, "transfer-encoding")))
1715
1716def req.put.one(m: Map<&2, List<&2, String>>, +k: String, vs: List<&2, String>, skip: Bool) -> Map<&2, List<&2, String>>:
1717 match skip:
1718 case True{}:
1719 m
1720 case False{}:
1721 Map.set(&2, List<&2, String>, m, k, vs)
1722
1723def req.put(xs: List<&2, Sigma<&2, &2, String, _ => List<&2, String>>>, m: Map<&2, List<&2, String>>) -> Map<&2, List<&2, String>>:
1724 match xs:
1725 case Nil{}:
1726 m
1727 case (k, vs) <> t:
1728 +lk = String.to_lower(k)
1729 req.put(t, req.put.one(m, lk, vs, req.reserved(lk)))
1730
1731# RFC 9110 §8.6: no Content-Length on a bodiless request whose method gives a body no meaning.
1732def req.cl(+m: Map<&2, List<&2, String>>, +method: String, +len: U32) -> Map<&2, List<&2, String>>:
1733 +bodied = Bool.or(Bool.not(U32.is_zero(len)), Bool.or(String.eq(method, "POST"), Bool.or(String.eq(method, "PUT"), String.eq(method, "PATCH"))))
1734 Bool.pick(Map<&2, List<&2, String>>, bodied, set(m, "content-length", U32.show(len)), m)
1735
1736# Caller headers are lowercased so they cannot duplicate ours; host, connection,
1737# content-length and transfer-encoding are always ours (no smuggling through them).
1738def encode_req.word(close: Bool) -> String:
1739 match close:
1740 case True{}:
1741 "close"
1742 case False{}:
1743 "keep-alive"
1744
1745def encode_req.on(+method: String, target: String, host: String, headers: Map<&2, List<&2, String>>, body: Bytes.Bytes, close: Bool) -> Bytes.Bytes:
1746 Bytes.Bytes{+len, buf} = body
1747 +h = set(set(req.put(Map.to_list(&2, List<&2, String>, headers), empty()), "host", host), "connection", encode_req.word(close))
1748 Bytes.append(Bytes.from_string(request(method, target, req.cl(h, method, len), "")), Bytes.Bytes{len, buf})
1749
1750def encode_req(+method: String, target: String, host: String, headers: Map<&2, List<&2, String>>, body: Bytes.Bytes) -> Bytes.Bytes:
1751 encode_req.on(method, target, host, headers, body, True{})
1752
1753# Redirects (RFC 9110 §15.4, as WHATWG fetch applies them)
1754# --------------------------------------------------------
1755
1756# One request to make: headers are already lowercased (see req.put).
1757type Hop is Type:
1758 Hop{method: String, url: Url.Abs, headers: Map<&2, List<&2, String>>, body: Bytes.Bytes}
1759
1760def redirect.code(+s: U32) -> Bool:
1761 Bool.or(Bool.or(U32.is_eq(s, 301), U32.is_eq(s, 302)), Bool.or(U32.is_eq(s, 303), Bool.or(U32.is_eq(s, 307), U32.is_eq(s, 308))))
1762
1763def redirect.origin(a: Url.Abs) -> String:
1764 Url.Abs{scheme, host, port, target} = a
1765 scheme ++ "://" ++ host ++ ":" ++ U32.show(port)
1766
1767def redirect.del(ks: List<&2, String>, m: Map<&2, List<&2, String>>) -> Map<&2, List<&2, String>>:
1768 match ks:
1769 case Nil{}:
1770 m
1771 case Con{k, t}:
1772 redirect.del(t, Map.del(&2, List<&2, String>, m, k))
1773
1774def redirect.hdrs(+h: Map<&2, List<&2, String>>, drop: Bool, cross: Bool) -> Map<&2, List<&2, String>>:
1775 +h2 = Bool.pick(Map<&2, List<&2, String>>, drop, redirect.del(["content-type", "content-encoding", "content-language", "content-location"], h), h)
1776 Bool.pick(Map<&2, List<&2, String>>, cross, redirect.del(["authorization", "cookie", "proxy-authorization"], h2), h2)
1777
1778# 303 turns any method but HEAD into GET; 301 and 302 turn POST into GET;
1779# 307 and 308 keep method and body. A GET carries no body or body headers.
1780# Credentials do not follow a hop to another origin.
1781def redirect.body(drop: Bool, body: Bytes.Bytes) -> Bytes.Bytes:
1782 match drop:
1783 case True{}:
1784 Bytes.new(0)
1785 case False{}:
1786 body
1787
1788def redirect.to(+status: U32, +method: String, +from: Url.Abs, headers: Map<&2, List<&2, String>>, body: Bytes.Bytes, next: Maybe<&2, Url.Abs>) -> Maybe<&1, Hop>:
1789 match next:
1790 case None{}:
1791 None{}
1792 case Some{+to}:
1793 +drop = Bool.or(Bool.and(U32.is_eq(status, 303), Bool.not(String.eq(method, "HEAD"))), Bool.and(Bool.or(U32.is_eq(status, 301), U32.is_eq(status, 302)), String.eq(method, "POST")))
1794 Some{Hop{Bool.pick(String, drop, "GET", method), to, redirect.hdrs(headers, drop, Bool.not(String.eq(redirect.origin(from), redirect.origin(to)))), redirect.body(drop, body)}}
1795
1796def redirect.hop(status: U32, h: Hop, loc: String) -> Maybe<&1, Hop>:
1797 Hop{method, +url, headers, body} = h
1798 redirect.to(status, method, url, headers, body, Url.resolve(url, loc))
1799
1800def redirect.if(status: U32, h: Hop, loc: String, ok: Bool) -> Maybe<&1, Hop>:
1801 match ok:
1802 case False{}:
1803 None{}
1804 case True{}:
1805 redirect.hop(status, h, loc)
1806
1807# The next request after a response, or None when it is not a redirect we follow.
1808def redirect(+status: U32, +headers: Map<&2, List<&2, String>>, h: Hop) -> Maybe<&1, Hop>:
1809 redirect.if(status, h, header(headers, "location"), Bool.and(redirect.code(status), has_header(headers, "location")))
1810
1811# Cookies (RFC 6265bis §5)
1812# ------------------------
1813
1814# A stored cookie. domain is lowercase, with no leading dot; host_only sends it to that host alone.
1815# expiry None is a session cookie. http_only and same_site ("strict", "lax", "none" or "default")
1816# are kept, not enforced: fetch has no browsing client, so its requests are same-site (§5.2).
1817type Cookie is Data:
1818 Cookie{name: String, value: String, domain: String, host_only: Bool, path: String, secure: Bool, http_only: Bool, same_site: String, expiry: Maybe<&2, Time.Instant>}
1819
1820# The cookies, oldest first, and the caller's clock. No cookie in it has expired by now.
1821type Jar is Data:
1822 Jar{now: Time.Instant, cookies: List<&2, Cookie>}
1823
1824def jar.new(now: Time.Instant) -> Jar:
1825 Jar{now, Nil{}}
1826
1827def jar.cookies(j: Jar) -> List<&2, Cookie>:
1828 Jar{now, cs} = j
1829 cs
1830
1831def cookie.live.at(+now: Time.Instant, e: Maybe<&2, Time.Instant>) -> Bool:
1832 match e:
1833 case None{}:
1834 True{}
1835 case Some{t}:
1836 Cmp.is_lt(Time.Instant.cmp(now, t))
1837
1838# Alive at now: no expiry, or an expiry after now.
1839def cookie.live(+now: Time.Instant, c: Cookie) -> Bool:
1840 Cookie{name, value, domain, host_only, path, secure, http_only, same_site, expiry} = c
1841 cookie.live.at(now, expiry)
1842
1843def jar.live(cs: List<&2, Cookie>, +now: Time.Instant) -> List<&2, Cookie>:
1844 match cs:
1845 case Nil{}:
1846 Nil{}
1847 case Con{+c, t}:
1848 List.filter.put(Cookie, c, jar.live(t, now), cookie.live(now, c))
1849
1850# The jar at a later time: cookies expired by now are evicted (§5.7).
1851def jar.at(j: Jar, +now: Time.Instant) -> Jar:
1852 Jar{old, cs} = j
1853 Jar{now, jar.live(cs, now)}
1854
1855def cookie.cut.found(r: String & String) -> String & String & Bool:
1856 (a, b) = r
1857 (a, b, True{})
1858
1859# hit: the last char pushed onto acc was c.
1860def cookie.cut.go(s: String, +c: U32, acc: String, hit: Bool) -> String & String & Bool:
1861 match s:
1862 case SNil{}:
1863 match hit:
1864 case True{}:
1865 cookie.cut.found(take.cut(acc, SNil{}))
1866 case False{}:
1867 (String.reverse(acc), SNil{}, False{})
1868 case SCon{Chr{+x}, t}:
1869 match hit:
1870 case True{}:
1871 cookie.cut.found(take.cut(acc, SCon{Chr{x}, t}))
1872 case False{}:
1873 cookie.cut.go(t, c, SCon{Chr{x}, acc}, U32.is_eq(x, c))
1874
1875# s split at its first c: before, after, and whether c was there.
1876def cookie.cut(s: String, +c: U32) -> String & String & Bool:
1877 cookie.cut.go(s, c, SNil{}, False{})
1878
1879def cookie.fst(r: String & String & Bool) -> String:
1880 (a, b, found) = r
1881 a
1882
1883# The path of an origin-form target: the part before "?".
1884def cookie.target_path(t: String) -> String:
1885 cookie.fst(cookie.cut(t, 63))
1886
1887# Longer than n octets.
1888def cookie.over(s: String, +n: U32) -> Bool:
1889 match s:
1890 case SNil{}:
1891 False{}
1892 case SCon{c, t}:
1893 Bool.or(U32.is_eq(n, 0), cookie.over(t, (n - 1 : U32)))
1894
1895# %x00-08 / %x0A-1F / %x7F: control characters other than HTAB.
1896def cookie.ctl(s: String) -> Bool:
1897 match s:
1898 case SNil{}:
1899 False{}
1900 case SCon{Chr{+c}, t}:
1901 Bool.or(Bool.or(U32.is_lt(c, 9), Bool.and(U32.is_gt(c, 9), U32.is_lt(c, 32))), Bool.or(U32.is_eq(c, 127), cookie.ctl(t)))
1902
1903def cookie.ascii(s: String) -> Bool:
1904 match s:
1905 case SNil{}:
1906 True{}
1907 case SCon{Chr{+c}, t}:
1908 Bool.and(U32.is_lt(c, 128), cookie.ascii(t))
1909
1910def cookie.ip4(s: String) -> Bool:
1911 match s:
1912 case SNil{}:
1913 True{}
1914 case SCon{Chr{+c}, t}:
1915 Bool.and(Bool.or(parse_u32.digit(c), U32.is_eq(c, 46)), cookie.ip4(t))
1916
1917# An IP literal rather than a host name: IPv6 has a colon, IPv4 is digits and dots.
1918def cookie.ip(+h: String) -> Bool:
1919 Bool.or(String.contains(h, ":"), cookie.ip4(h))
1920
1921# §5.1.3: s is d, or a host name under d on a label boundary.
1922def cookie.domain_match(+s: String, +d: String) -> Bool:
1923 Bool.or(String.eq(s, d), Bool.and(String.ends_with(s, "." ++ d), Bool.not(cookie.ip(s))))
1924
1925# A reversed path with its last segment and slash dropped.
1926def cookie.up(rs: String) -> String:
1927 match rs:
1928 case SNil{}:
1929 SNil{}
1930 case SCon{Chr{47}, t}:
1931 t
1932 case SCon{Chr{c}, t}:
1933 cookie.up(t)
1934
1935# §5.1.4: the request path up to its last "/", or "/".
1936def cookie.default_path(+p: String) -> String:
1937 +up = String.reverse(cookie.up(String.reverse(p)))
1938 Bool.pick(String, Bool.or(Bool.not(String.starts_with(p, "/")), String.is_empty(up)), "/", up)
1939
1940# §5.1.4: request path p path-matches cookie path c.
1941def cookie.path_match(+p: String, +c: String) -> Bool:
1942 Bool.or(String.eq(p, c), Bool.and(String.starts_with(p, c), Bool.or(String.ends_with(c, "/"), String.starts_with(String.drop(p, String.length(c)), "/"))))
1943
1944type Hms is Data:
1945 Hms{h: U32, m: U32, s: U32}
1946
1947# §5.1.1 cookie-date: the first time, day, month and year tokens found.
1948type Cdate is Data:
1949 Cdate{time: Maybe<&2, Hms>, day: Maybe<&2, U32>, month: Maybe<&2, U32>, year: Maybe<&2, U32>}
1950
1951def cookie.date.delim(+c: U32) -> Bool:
1952 Bool.or(U32.is_eq(c, 9), Bool.or(Bool.and(U32.is_ge(c, 32), U32.is_le(c, 47)), Bool.or(Bool.and(U32.is_ge(c, 59), U32.is_le(c, 64)), Bool.or(Bool.and(U32.is_ge(c, 91), U32.is_le(c, 96)), Bool.and(U32.is_ge(c, 123), U32.is_le(c, 126))))))
1953
1954def cookie.date.push(acc: String, ts: List<&2, String>) -> List<&2, String>:
1955 match acc:
1956 case SNil{}:
1957 ts
1958 case SCon{h, t}:
1959 Con{String.reverse(SCon{h, t}), ts}
1960
1961def cookie.date.step(d: Bool, +c: U32, acc: String, ts: List<&2, String>) -> String & List<&2, String>:
1962 match d:
1963 case True{}:
1964 (SNil{}, cookie.date.push(acc, ts))
1965 case False{}:
1966 (SCon{Chr{c}, acc}, ts)
1967
1968# The date-tokens, last first. st: the token so far (reversed) and the tokens before it.
1969def cookie.date.tokens(s: String, st: String & List<&2, String>) -> List<&2, String>:
1970 match s:
1971 case SNil{}:
1972 (acc, ts) = st
1973 cookie.date.push(acc, ts)
1974 case SCon{Chr{+c}, t}:
1975 (acc, ts) = st
1976 cookie.date.tokens(t, cookie.date.step(cookie.date.delim(c), c, acc, ts))
1977
1978def cookie.date.head(+s: String) -> Bool:
1979 match s:
1980 case SNil{}:
1981 False{}
1982 case SCon{Chr{+c}, t}:
1983 parse_u32.digit(c)
1984
1985# The digits at the start of s: (count, value, rest). d: s starts with a digit.
1986def cookie.date.run(s: String, d: Bool, +n: U32, +acc: U32) -> U32 & U32 & String:
1987 match s:
1988 case SNil{}:
1989 (n, acc, SNil{})
1990 case SCon{Chr{+c}, +t}:
1991 match d:
1992 case True{}:
1993 cookie.date.run(t, cookie.date.head(t), (n + 1 : U32), (acc * 10 + (c - 48 : U32) : U32))
1994 case False{}:
1995 (n, acc, SCon{Chr{c}, t})
1996
1997def cookie.date.within(r: U32 & U32 & String, +lo: U32, +hi: U32) -> Maybe<&1, U32 & String>:
1998 (+n, v, rest) = r
1999 Bool.pick(Maybe<&1, U32 & String>, Bool.and(U32.is_ge(n, lo), U32.is_le(n, hi)), Some{(v, rest)}, None{})
2000
2001# lo to hi digits and what follows them, which does not start with a digit.
2002def cookie.date.num(+s: String, +lo: U32, +hi: U32) -> Maybe<&1, U32 & String>:
2003 cookie.date.within(cookie.date.run(s, cookie.date.head(s), 0, 0), lo, hi)
2004
2005def cookie.date.val(m: Maybe<&1, U32 & String>) -> Maybe<&2, U32>:
2006 match m:
2007 case None{}:
2008 None{}
2009 case Some{(v, t)}:
2010 Some{v}
2011
2012def cookie.date.colon(s: String) -> Maybe<&2, String>:
2013 match s:
2014 case SNil{}:
2015 None{}
2016 case SCon{Chr{58}, t}:
2017 Some{t}
2018 case SCon{Chr{c}, t}:
2019 None{}
2020
2021def cookie.date.sec(+h: U32, +m: U32, r: Maybe<&1, U32 & String>) -> Maybe<&2, Hms>:
2022 match r:
2023 case None{}:
2024 None{}
2025 case Some{(s, t)}:
2026 Some{Hms{h, m, s}}
2027
2028def cookie.date.min.c(+h: U32, +m: U32, c: Maybe<&2, String>) -> Maybe<&2, Hms>:
2029 match c:
2030 case None{}:
2031 None{}
2032 case Some{+t}:
2033 cookie.date.sec(h, m, cookie.date.num(t, 1, 2))
2034
2035def cookie.date.min(+h: U32, r: Maybe<&1, U32 & String>) -> Maybe<&2, Hms>:
2036 match r:
2037 case None{}:
2038 None{}
2039 case Some{(m, t)}:
2040 cookie.date.min.c(h, m, cookie.date.colon(t))
2041
2042def cookie.date.hour.c(+h: U32, c: Maybe<&2, String>) -> Maybe<&2, Hms>:
2043 match c:
2044 case None{}:
2045 None{}
2046 case Some{+t}:
2047 cookie.date.min(h, cookie.date.num(t, 1, 2))
2048
2049def cookie.date.hour(r: Maybe<&1, U32 & String>) -> Maybe<&2, Hms>:
2050 match r:
2051 case None{}:
2052 None{}
2053 case Some{(h, t)}:
2054 cookie.date.hour.c(h, cookie.date.colon(t))
2055
2056# hms-time: 1*2DIGIT ":" 1*2DIGIT ":" 1*2DIGIT, then anything but a digit.
2057def cookie.date.time(+tok: String) -> Maybe<&2, Hms>:
2058 cookie.date.hour(cookie.date.num(tok, 1, 2))
2059
2060def cookie.date.month.go(xs: List<&2, String>, +w: String, +i: U32) -> Maybe<&2, U32>:
2061 match xs:
2062 case Nil{}:
2063 None{}
2064 case Con{x, t}:
2065 Bool.pick(Maybe<&2, U32>, String.eq(x, w), Some{i}, cookie.date.month.go(t, w, (i + 1 : U32)))
2066
2067# The month named by the first three letters, from 1.
2068def cookie.date.month(+tok: String) -> Maybe<&2, U32>:
2069 cookie.date.month.go(["jan", "feb", "mar", "apr", "may", "jun", "jul", "aug", "sep", "oct", "nov", "dec"], String.to_lower(String.take(tok, 3n)), 1)
2070
2071# Each try* below: the flag is set, so go on; or the token matches, so stop; or go on.
2072def cookie.date.year(y: Maybe<&2, U32>, +tok: String, t: Maybe<&2, Hms>, d: Maybe<&2, U32>, m: Maybe<&2, U32>) -> Cdate:
2073 match y:
2074 case None{}:
2075 Cdate{t, d, m, cookie.date.val(cookie.date.num(tok, 2, 4))}
2076 case Some{v}:
2077 Cdate{t, d, m, Some{v}}
2078
2079def cookie.date.month.got(g: Maybe<&2, U32>, +tok: String, t: Maybe<&2, Hms>, d: Maybe<&2, U32>, y: Maybe<&2, U32>) -> Cdate:
2080 match g:
2081 case None{}:
2082 cookie.date.year(y, tok, t, d, None{})
2083 case Some{v}:
2084 Cdate{t, d, Some{v}, y}
2085
2086def cookie.date.month.try(m: Maybe<&2, U32>, +tok: String, t: Maybe<&2, Hms>, d: Maybe<&2, U32>, y: Maybe<&2, U32>) -> Cdate:
2087 match m:
2088 case None{}:
2089 cookie.date.month.got(cookie.date.month(tok), tok, t, d, y)
2090 case Some{v}:
2091 cookie.date.year(y, tok, t, d, Some{v})
2092
2093def cookie.date.day.got(g: Maybe<&2, U32>, +tok: String, t: Maybe<&2, Hms>, m: Maybe<&2, U32>, y: Maybe<&2, U32>) -> Cdate:
2094 match g:
2095 case None{}:
2096 cookie.date.month.try(m, tok, t, None{}, y)
2097 case Some{v}:
2098 Cdate{t, Some{v}, m, y}
2099
2100def cookie.date.day.try(d: Maybe<&2, U32>, +tok: String, t: Maybe<&2, Hms>, m: Maybe<&2, U32>, y: Maybe<&2, U32>) -> Cdate:
2101 match d:
2102 case None{}:
2103 cookie.date.day.got(cookie.date.val(cookie.date.num(tok, 1, 2)), tok, t, m, y)
2104 case Some{v}:
2105 cookie.date.month.try(m, tok, t, Some{v}, y)
2106
2107def cookie.date.time.got(g: Maybe<&2, Hms>, +tok: String, d: Maybe<&2, U32>, m: Maybe<&2, U32>, y: Maybe<&2, U32>) -> Cdate:
2108 match g:
2109 case None{}:
2110 cookie.date.day.try(d, tok, None{}, m, y)
2111 case Some{v}:
2112 Cdate{Some{v}, d, m, y}
2113
2114def cookie.date.time.try(t: Maybe<&2, Hms>, +tok: String, d: Maybe<&2, U32>, m: Maybe<&2, U32>, y: Maybe<&2, U32>) -> Cdate:
2115 match t:
2116 case None{}:
2117 cookie.date.time.got(cookie.date.time(tok), tok, d, m, y)
2118 case Some{v}:
2119 cookie.date.day.try(d, tok, Some{v}, m, y)
2120
2121def cookie.date.fold(ts: List<&2, String>, st: Cdate) -> Cdate:
2122 match ts:
2123 case Nil{}:
2124 st
2125 case Con{+tok, rest}:
2126 Cdate{t, d, m, y} = st
2127 cookie.date.fold(rest, cookie.date.time.try(t, tok, d, m, y))
2128
2129# 70–99 are 19xx, 0–69 are 20xx.
2130def cookie.date.fix(+y: U32) -> U32:
2131 Bool.pick(U32, U32.is_le(y, 69), (y + 2000 : U32), Bool.pick(U32, U32.is_le(y, 99), (y + 1900 : U32), y))
2132
2133def cookie.date.at(+y: U32, +d: U32, mo: U32, h: U32, mi: U32, s: U32) -> Maybe<&2, Time.Instant>:
2134 Bool.pick(Maybe<&2, Time.Instant>, Bool.and(U32.is_ge(y, 1601), Bool.and(U32.is_ge(d, 1), U32.is_le(d, 31))), Time.mk(Time.DateTime{Time.Date{y, mo, d}, h, mi, s, 0}), None{})
2135
2136def cookie.date.fin(st: Cdate) -> Maybe<&2, Time.Instant>:
2137 match st:
2138 case Cdate{Some{Hms{h, mi, s}}, Some{d}, Some{mo}, Some{y}}:
2139 cookie.date.at(cookie.date.fix(y), d, mo, h, mi, s)
2140 case _:
2141 None{}
2142
2143# §5.1.1: a cookie-date such as "Sun, 06 Nov 1994 08:49:37 GMT" or "Thu, 01-Jan-70 00:00:01 GMT".
2144# Time.mk refuses a day past the month's end and a time past 23:59:59.
2145def cookie.date(s: String) -> Maybe<&2, Time.Instant>:
2146 cookie.date.fin(cookie.date.fold(List.reverse(&2, String, cookie.date.tokens(s, (SNil{}, Nil{}))), Cdate{None{}, None{}, None{}, None{}}))
2147
2148# §5.6.1–§5.6.7: the last of each attribute. expires is the date as sent; max_age is capped seconds.
2149# Neither is a time from now yet: a Cav with a Time.Instant and now beside it is too wide (bendlang/bend#1069).
2150type Cav is Data:
2151 Cav{expires: Maybe<&2, Time.Instant>, max_age: Maybe<&2, U32>, domain: String, path: Maybe<&2, String>, secure: Bool, http_only: Bool, same_site: String}
2152
2153def cookie.cav() -> Cav:
2154 Cav{None{}, None{}, "", None{}, False{}, False{}, "default"}
2155
2156# §5.5: 400 days, the longest a cookie lives.
2157def cookie.limit() -> U32:
2158 34560000
2159
2160def cookie.later(+now: Time.Instant, +secs: U32) -> Time.Instant:
2161 Time.Instant.add(now, Time.Duration.of_secs(Int.I64.from_u32(secs)))
2162
2163def cookie.expires.cap(+now: Time.Instant, m: Maybe<&2, Time.Instant>) -> Maybe<&2, Time.Instant>:
2164 match m:
2165 case None{}:
2166 None{}
2167 case Some{+t}:
2168 +lim = cookie.later(now, cookie.limit())
2169 Some{Bool.pick(Time.Instant, Cmp.is_lt(Time.Instant.cmp(lim, t)), lim, t)}
2170
2171def cookie.max_age.zero(m: Maybe<&2, U32>) -> Maybe<&2, U32>:
2172 match m:
2173 case None{}:
2174 None{}
2175 case Some{s}:
2176 Some{0}
2177
2178def cookie.max_age.nz(s: String) -> String:
2179 match s:
2180 case SNil{}:
2181 SNil{}
2182 case SCon{Chr{48}, t}:
2183 cookie.max_age.nz(t)
2184 case SCon{Chr{c}, t}:
2185 SCon{Chr{c}, t}
2186
2187# More than 9 significant digits is past the limit (and would overflow parse_u32).
2188def cookie.max_age.cap(long: Bool, m: Maybe<&2, U32>) -> Maybe<&2, U32>:
2189 match m:
2190 case None{}:
2191 None{}
2192 case Some{s}:
2193 Some{Bool.pick(U32, long, cookie.limit(), s)}
2194
2195def cookie.max_age.secs(+v: String, neg: Bool) -> Maybe<&2, U32>:
2196 match neg:
2197 case True{}:
2198 cookie.max_age.zero(parse_u32(String.drop(v, 1n)))
2199 case False{}:
2200 cookie.max_age.cap(cookie.over(cookie.max_age.nz(v), 9), parse_u32(v))
2201
2202# Zero or less is the earliest time, so the cookie is already expired.
2203def cookie.max_age.at(+now: Time.Instant, m: Maybe<&2, U32>) -> Maybe<&2, Time.Instant>:
2204 match m:
2205 case None{}:
2206 None{}
2207 case Some{+s}:
2208 Some{Bool.pick(Time.Instant, U32.is_eq(s, 0), Time.Instant.epoch(), cookie.later(now, U32.min(s, cookie.limit())))}
2209
2210# §5.6.2: DIGIT*, or "-" and DIGIT*. Anything else is ignored.
2211def cookie.max_age(+v: String) -> Maybe<&2, U32>:
2212 cookie.max_age.secs(v, String.starts_with(v, "-"))
2213
2214def cookie.same_site(+v: String) -> String:
2215 +l = String.to_lower(v)
2216 Bool.pick(String, Bool.or(String.eq(l, "strict"), Bool.or(String.eq(l, "lax"), String.eq(l, "none"))), l, "default")
2217
2218type Av is Data:
2219 AvExpires{}
2220 AvMaxAge{}
2221 AvDomain{}
2222 AvPath{}
2223 AvSecure{}
2224 AvHttpOnly{}
2225 AvSameSite{}
2226 AvOther{}
2227
2228def cookie.av.kind(+k: String) -> Av:
2229 Bool.pick(Av, String.eq(k, "expires"), AvExpires{}, Bool.pick(Av, String.eq(k, "max-age"), AvMaxAge{}, Bool.pick(Av, String.eq(k, "domain"), AvDomain{}, Bool.pick(Av, String.eq(k, "path"), AvPath{}, Bool.pick(Av, String.eq(k, "secure"), AvSecure{}, Bool.pick(Av, String.eq(k, "httponly"), AvHttpOnly{}, Bool.pick(Av, String.eq(k, "samesite"), AvSameSite{}, AvOther{})))))))
2230
2231# An Expires or Max-Age that does not parse leaves the earlier one. A leading dot of Domain is dropped.
2232def cookie.av.put(k: Av, a: Cav, +v: String) -> Cav:
2233 match k a:
2234 case AvExpires{} Cav{e, m, d, p, s, h, ss}:
2235 Cav{Maybe.or(&2, Time.Instant, cookie.date(v), e), m, d, p, s, h, ss}
2236 case AvMaxAge{} Cav{e, m, d, p, s, h, ss}:
2237 Cav{e, Maybe.or(&2, U32, cookie.max_age(v), m), d, p, s, h, ss}
2238 case AvDomain{} Cav{e, m, d, p, s, h, ss}:
2239 Cav{e, m, String.to_lower(Bool.pick(String, String.starts_with(v, "."), String.drop(v, 1n), v)), p, s, h, ss}
2240 case AvPath{} Cav{e, m, d, p, s, h, ss}:
2241 Cav{e, m, d, Some{v}, s, h, ss}
2242 case AvSecure{} Cav{e, m, d, p, s, h, ss}:
2243 Cav{e, m, d, p, True{}, h, ss}
2244 case AvHttpOnly{} Cav{e, m, d, p, s, h, ss}:
2245 Cav{e, m, d, p, s, True{}, ss}
2246 case AvSameSite{} Cav{e, m, d, p, s, h, ss}:
2247 Cav{e, m, d, p, s, h, cookie.same_site(v)}
2248 case AvOther{} Cav{e, m, d, p, s, h, ss}:
2249 Cav{e, m, d, p, s, h, ss}
2250
2251# §5.6: name and value trimmed; a value over 1024 octets drops the attribute.
2252def cookie.av(+a: Cav, kv: String & String & Bool) -> Cav:
2253 (k, v, found) = kv
2254 +tv = trim(v)
2255 Bool.pick(Cav, cookie.over(tv, 1024), a, cookie.av.put(cookie.av.kind(String.to_lower(trim(k))), a, tv))
2256
2257def cookie.avs(xs: List<&2, String>, a: Cav) -> Cav:
2258 match xs:
2259 case Nil{}:
2260 a
2261 case Con{x, t}:
2262 cookie.avs(t, cookie.av(a, cookie.cut(x, 61)))
2263
2264# §5.6: with no "=", the name is empty and the pair is the value.
2265def cookie.nv(r: String & String & Bool) -> String & String:
2266 (a, b, found) = r
2267 match found:
2268 case True{}:
2269 (trim(a), trim(b))
2270 case False{}:
2271 ("", trim(a))
2272
2273def cookie.prefixed(+s: String, +p: String) -> Bool:
2274 String.starts_with(String.to_lower(s), p)
2275
2276# §5.7 steps 8–10: (domain, host-only), or None to ignore the cookie.
2277# ponytail: the public-suffix check knows single-label suffixes only (com, org, localhost). Multi-label
2278# ones (co.uk, github.io) need the publicsuffix.org list; ship it as data when a caller needs it.
2279def cookie.domain.of(+host: String, +d: String) -> Maybe<&1, String & Bool>:
2280 +suffix = Bool.and(Bool.not(String.is_empty(d)), Bool.not(String.contains(d, ".")))
2281 +d2 = Bool.pick(String, Bool.and(suffix, String.eq(d, host)), "", d)
2282 Bool.pick(Maybe<&1, String & Bool>, Bool.or(Bool.and(suffix, Bool.not(String.eq(d, host))), Bool.not(cookie.ascii(d))), None{},
2283 Bool.pick(Maybe<&1, String & Bool>, String.is_empty(d2), Some{(host, True{})},
2284 Bool.pick(Maybe<&1, String & Bool>, cookie.domain_match(host, d2), Some{(d2, False{})}, None{})))
2285
2286def cookie.path.of(p: Maybe<&2, String>, +req: String) -> String:
2287 match p:
2288 case None{}:
2289 cookie.default_path(req)
2290 case Some{+v}:
2291 Bool.pick(String, String.starts_with(v, "/"), v, cookie.default_path(req))
2292
2293# §5.7 steps 12–20: Secure needs https; SameSite=None needs Secure; the __Secure- and __Host- prefixes.
2294def cookie.make.dm(dm: Maybe<&1, String & Bool>, +name: String, +value: String, +path: String, has_path: Bool, +secure: Bool, http_only: Bool, +same_site: String, expiry: Maybe<&2, Time.Instant>, https: Bool) -> Maybe<&2, Cookie>:
2295 match dm:
2296 case None{}:
2297 None{}
2298 case Some{(domain, +host_only)}:
2299 +host = Bool.and(Bool.and(secure, host_only), Bool.and(has_path, String.eq(path, "/")))
2300 +bad = Bool.or(Bool.or(Bool.and(secure, Bool.not(https)), Bool.and(String.eq(same_site, "none"), Bool.not(secure))),
2301 Bool.or(Bool.or(Bool.and(cookie.prefixed(name, "__secure-"), Bool.not(secure)), Bool.and(cookie.prefixed(name, "__host-"), Bool.not(host))),
2302 Bool.and(String.is_empty(name), Bool.or(cookie.prefixed(value, "__secure-"), cookie.prefixed(value, "__host-")))))
2303 Bool.pick(Maybe<&2, Cookie>, bad, None{}, Some{Cookie{name, value, domain, host_only, path, secure, http_only, same_site, expiry}})
2304
2305# Max-Age wins over Expires, whatever their order (§5.7 step 6). Both count from now.
2306def cookie.expiry(+now: Time.Instant, m: Maybe<&2, U32>, e: Maybe<&2, Time.Instant>) -> Maybe<&2, Time.Instant>:
2307 Maybe.or(&2, Time.Instant, cookie.max_age.at(now, m), cookie.expires.cap(now, e))
2308
2309def cookie.make(+now: Time.Instant, a: Url.Abs, +name: String, +value: String, c: Cav) -> Maybe<&2, Cookie>:
2310 Url.Abs{scheme, host, port, target} = a
2311 Cav{e, m, d, +p, secure, http_only, same_site} = c
2312 cookie.make.dm(cookie.domain.of(host, d), name, value, cookie.path.of(p, cookie.target_path(target)), Maybe.is_some(&2, String, p), secure, http_only, same_site, cookie.expiry(now, m, e), String.eq(scheme, "https"))
2313
2314# An empty name and value, or more than 4096 octets of them, is ignored.
2315def cookie.parse.nv(+now: Time.Instant, a: Url.Abs, nv: String & String, avs: List<&2, String>) -> Maybe<&2, Cookie>:
2316 (+name, +value) = nv
2317 Bool.pick(Maybe<&2, Cookie>, Bool.or(Bool.and(String.is_empty(name), String.is_empty(value)), cookie.over(name ++ value, 4096)), None{}, cookie.make(now, a, name, value, cookie.avs(avs, cookie.cav())))
2318
2319def cookie.parse.go(+now: Time.Instant, a: Url.Abs, xs: List<&2, String>) -> Maybe<&2, Cookie>:
2320 match xs:
2321 case Nil{}:
2322 None{}
2323 case Con{first, avs}:
2324 cookie.parse.nv(now, a, cookie.nv(cookie.cut(first, 61)), avs)
2325
2326# §5.6 and §5.7: one Set-Cookie value received from a at now, or None when it is ignored.
2327def cookie.parse(+now: Time.Instant, a: Url.Abs, +line: String) -> Maybe<&2, Cookie>:
2328 Bool.pick(Maybe<&2, Cookie>, cookie.ctl(line), None{}, cookie.parse.go(now, a, String.split(line, ';')))
2329
2330def cookie.https(a: Url.Abs) -> Bool:
2331 Url.Abs{scheme, host, port, target} = a
2332 String.eq(scheme, "https")
2333
2334def cookie.secure(c: Cookie) -> Bool:
2335 Cookie{name, value, domain, host_only, path, secure, http_only, same_site, expiry} = c
2336 secure
2337
2338# Same name, domain, host-only flag and path: the new cookie replaces the old one.
2339def cookie.same(+a: Cookie, +b: Cookie) -> Bool:
2340 Cookie{n1, v1, d1, h1, p1, s1, o1, ss1, e1} = a
2341 Cookie{n2, v2, d2, h2, p2, s2, o2, ss2, e2} = b
2342 Bool.and(Bool.and(String.eq(n1, n2), String.eq(d1, d2)), Bool.and(Bool.not(Bool.xor(h1, h2)), String.eq(p1, p2)))
2343
2344# §5.7 step 16: a secure cookie that a new cookie from plain http must not overlay.
2345def cookie.shadows(+old: Cookie, +c: Cookie) -> Bool:
2346 Cookie{n1, v1, +d1, h1, p1, s1, o1, ss1, e1} = old
2347 Cookie{n2, v2, +d2, h2, p2, s2, o2, ss2, e2} = c
2348 Bool.and(Bool.and(String.eq(n1, n2), s1), Bool.and(Bool.or(cookie.domain_match(d1, d2), cookie.domain_match(d2, d1)), cookie.path_match(p2, p1)))
2349
2350def cookie.shadowed(cs: List<&2, Cookie>, +c: Cookie) -> Bool:
2351 match cs:
2352 case Nil{}:
2353 False{}
2354 case Con{+o, t}:
2355 Bool.or(cookie.shadows(o, c), cookie.shadowed(t, c))
2356
2357# cs with the cookie c replaces swapped for c (keeping its place, so its creation order), or c last.
2358# A c that is not live only removes the old one: that is how a server deletes a cookie.
2359def cookie.put(cs: List<&2, Cookie>, +c: Cookie, +live: Bool) -> List<&2, Cookie>:
2360 match cs:
2361 case Nil{}:
2362 Bool.pick(List<&2, Cookie>, live, [c], Nil{})
2363 case Con{+o, +t}:
2364 Bool.pick(List<&2, Cookie>, cookie.same(o, c), Bool.pick(List<&2, Cookie>, live, Con{c, t}, t), Con{o, cookie.put(t, c, live)})
2365
2366def jar.put.c(m: Maybe<&2, Cookie>, j: Jar, +https: Bool) -> Jar:
2367 match m:
2368 case None{}:
2369 Jar{now, cs} = j
2370 Jar{now, cs}
2371 case Some{+c}:
2372 Jar{+now, +cs} = j
2373 Jar{now, Bool.pick(List<&2, Cookie>, Bool.and(Bool.not(Bool.or(https, cookie.secure(c))), cookie.shadowed(cs, c)), cs, cookie.put(cs, c, cookie.live(now, c)))}
2374
2375def jar.put.one(j: Jar, +a: Url.Abs, x: String) -> Jar:
2376 Jar{+now, cs} = j
2377 jar.put.c(cookie.parse(now, a, x), Jar{now, cs}, cookie.https(a))
2378
2379def jar.put.all(xs: List<&2, String>, j: Jar, +a: Url.Abs) -> Jar:
2380 match xs:
2381 case Nil{}:
2382 j
2383 case Con{x, t}:
2384 jar.put.all(t, jar.put.one(j, a, x), a)
2385
2386# Every set-cookie field of h, in order, as received from a.
2387def jar.store.abs(j: Jar, +a: Url.Abs, +h: Map<&2, List<&2, String>>) -> Jar:
2388 jar.put.all(fields(h, "set-cookie"), j, a)
2389
2390def jar.store.url(j: Jar, u: Maybe<&2, Url.Abs>, +h: Map<&2, List<&2, String>>) -> Jar:
2391 match u:
2392 case None{}:
2393 j
2394 case Some{+a}:
2395 jar.store.abs(j, a, h)
2396
2397# The jar after res came from url, and res as it was. Header names are lowercase, as parse gives them.
2398# An unparsable url stores nothing.
2399def jar.store(j: Jar, url: String, res: Res) -> Jar & Res:
2400 Res{status, +headers, body} = res
2401 (jar.store.url(j, Url.absolute(url), headers), Res{status, headers, body})
2402
2403# §5.8.3: domain (exact when host-only), path, and Secure only over https.
2404def cookie.sends(+host: String, +path: String, +https: Bool, +c: Cookie) -> Bool:
2405 Cookie{n, v, +d, +ho, +p, s, o, ss, e} = c
2406 Bool.and(Bool.pick(Bool, ho, String.eq(host, d), cookie.domain_match(host, d)), Bool.and(cookie.path_match(path, p), Bool.or(Bool.not(s), https)))
2407
2408def cookie.pick(cs: List<&2, Cookie>, +host: String, +path: String, +https: Bool) -> List<&2, Cookie>:
2409 match cs:
2410 case Nil{}:
2411 Nil{}
2412 case Con{+c, t}:
2413 List.filter.put(Cookie, c, cookie.pick(t, host, path, https), cookie.sends(host, path, https, c))
2414
2415# The sort order of §5.8.3: longer paths first; the stable sort keeps creation order among equals.
2416def cookie.longer(a: Cookie, b: Cookie) -> Bool:
2417 Cookie{n1, v1, d1, h1, p1, s1, o1, ss1, e1} = a
2418 Cookie{n2, v2, d2, h2, p2, s2, o2, ss2, e2} = b
2419 Bool.not(Nat.is_lt(String.length(p1), String.length(p2)))
2420
2421def cookie.pair(c: Cookie) -> String:
2422 Cookie{+n, +v, d, h, p, s, o, ss, e} = c
2423 Bool.pick(String, String.is_empty(n), v, n ++ "=" ++ v)
2424
2425def cookie.pairs(cs: List<&2, Cookie>) -> List<&2, String>:
2426 match cs:
2427 case Nil{}:
2428 Nil{}
2429 case Con{c, t}:
2430 Con{cookie.pair(c), cookie.pairs(t)}
2431
2432# §5.8.3: the cookie-string for a request to a, or "" when no cookie matches.
2433def jar.string(j: Jar, a: Url.Abs) -> String:
2434 Jar{now, cs} = j
2435 Url.Abs{scheme, +host, port, target} = a
2436 String.join(cookie.pairs(List.sort(~Cookie, ~cookie.longer, cookie.pick(cs, host, cookie.target_path(target), String.eq(scheme, "https")))), "; ")
2437
2438# One cookie field: the caller's own cookie values first, then the jar's.
2439def jar.header(+h: Map<&2, List<&2, String>>, +s: String) -> Map<&2, List<&2, String>>:
2440 +old = String.join(fields(h, "cookie"), "; ")
2441 Bool.pick(Map<&2, List<&2, String>>, String.is_empty(s), h, set(h, "cookie", Bool.pick(String, String.is_empty(old), s, old ++ "; " ++ s)))
2442
2443def jar.apply.url(j: Jar, u: Maybe<&2, Url.Abs>, +h: Map<&2, List<&2, String>>) -> Map<&2, List<&2, String>>:
2444 match u:
2445 case None{}:
2446 h
2447 case Some{a}:
2448 jar.header(h, jar.string(j, a))
2449
2450# The headers with the jar's cookies for a request to url in their cookie field (lowercase, as fetch
2451# sends names). An unparsable url adds nothing.
2452def jar.apply(j: Jar, url: String, +h: Map<&2, List<&2, String>>) -> Map<&2, List<&2, String>>:
2453 jar.apply.url(j, Url.absolute(url), h)
2454
2455# The jar, if any, that a fetch threads through its hops.
2456def jar.opt.apply(m: Maybe<&2, Jar>, a: Url.Abs, +h: Map<&2, List<&2, String>>) -> Map<&2, List<&2, String>>:
2457 match m:
2458 case None{}:
2459 h
2460 case Some{j}:
2461 jar.header(h, jar.string(j, a))
2462
2463def jar.opt.res(j: Jar, +a: Url.Abs, r: Result<&1, &1, Err, Res>) -> Maybe<&2, Jar> & Result<&1, &1, Err, Res>:
2464 match r:
2465 case Fail{e}:
2466 (Some{j}, Fail{e})
2467 case Done{res}:
2468 Res{status, +headers, body} = res
2469 (Some{jar.store.abs(j, a, headers)}, Done{Res{status, headers, body}})
2470
2471def jar.opt.store(m: Maybe<&2, Jar>, +a: Url.Abs, r: Result<&1, &1, Err, Res>) -> Maybe<&2, Jar> & Result<&1, &1, Err, Res>:
2472 match m:
2473 case None{}:
2474 (None{}, r)
2475 case Some{j}:
2476 jar.opt.res(j, a, r)
2477
2478def io.recv.words(tls: Bool, s: Socket, max: U32, ms: U32) -> IO(Socket & Result<&1, &1, U32 & String, U32 & Array<U32>>):
2479 match tls:
2480 case True{}:
2481 Wire.tls.recv.words(s, max, ms)
2482 case False{}:
2483 Wire.recv.words(s, max, ms)
2484
2485def io.send.words(tls: Bool, s: Socket, +len: U32, buf: Array<U32>) -> IO(Socket & Result<&1, &1, U32 & String, Unit>):
2486 match tls:
2487 case True{}:
2488 Wire.tls.send.words(s, len, buf)
2489 case False{}:
2490 Wire.send.words(s, len, buf)
2491
2492def io.send.bytes(tls: Bool, s: Socket, b: Bytes.Bytes) -> IO(Socket & Result<&1, &1, U32 & String, Unit>):
2493 Bytes.Bytes{+len, buf} = b
2494 io.send.words(tls, s, len, buf)
2495
2496def io.close(tls: Bool, s: Socket) -> IO(Unit):
2497 match tls:
2498 case True{}:
2499 Wire.tls.close(s)
2500 case False{}:
2501 Socket.close(s)
2502
2503def fetch.close(tls: Bool, s: Socket, r: Result<&1, &1, Err, Res>) -> IO(Result<&1, &1, Err, Res>):
2504 do IO<Result<&1, &1, Err, Res>>:
2505 io.close(tls, s)
2506 return r
2507
2508# none: no response byte arrived, so an idempotent request may be retried (RFC 9112 §9.3.1).
2509# sock: the socket, when it can take another request.
2510type Out is Type:
2511 OutDone{res: Res, sock: Maybe<&1, Socket>, rest: Bytes.Bytes}
2512 OutFail{e: Err, none: Bool}
2513
2514def fetch.boxed(r: Result<&1, &1, Err, Res>, none: Bool) -> Out:
2515 match r:
2516 case Done{res}:
2517 OutDone{res, None{}, Bytes.new(0)}
2518 case Fail{e}:
2519 OutFail{e, none}
2520
2521def fetch.bad(tls: Bool, s: Socket, e: Maybe<&2, Err>) -> IO(Result<&1, &1, Err, Res>):
2522 match e:
2523 case None{}:
2524 fetch.close(tls, s, Fail{ErrBad{}})
2525 case Some{err}:
2526 fetch.close(tls, s, Fail{err})
2527
2528def fetch.shut(tls: Bool, s: Socket, r: Result<&1, &1, Err, Res>, none: Bool) -> IO(Out):
2529 do IO<Out>:
2530 x : Result<&1, &1, Err, Res> <- fetch.close(tls, s, r)
2531 return fetch.boxed(x, none)
2532
2533def fetch.hold.go(tls: Bool, s: Socket, res: Res, left: Maybe<&1, Bytes.Bytes>) -> IO(Out):
2534 match left:
2535 case Some{x}:
2536 IO.pure(Out, OutDone{res, Some{s}, x})
2537 case None{}:
2538 fetch.shut(tls, s, Done{res}, False{})
2539
2540def fetch.hold(tls: Bool, close: Bool, s: Socket, res: Res, left: Maybe<&1, Bytes.Bytes>) -> IO(Out):
2541 Res{status, +headers, body} = res
2542 fetch.hold.go(tls, s, Res{status, headers, body}, again(close, headers, left))
2543
2544def fetch.failout(tls: Bool, s: Socket, e: Maybe<&2, Err>, none: Bool) -> IO(Out):
2545 do IO<Out>:
2546 r : Result<&1, &1, Err, Res> <- fetch.bad(tls, s, e)
2547 return fetch.boxed(r, none)
2548
2549# Read state: the response so far and the bytes read, or how it ended.
2550# none: no byte arrived, so an idempotent request may be retried.
2551type Fl is Type:
2552 FlMore{rv: Rv, n: U32}
2553 FlBad{err: Maybe<&2, Err>, none: Bool}
2554 FlDone{res: Res, rest: Maybe<&1, Bytes.Bytes>}
2555
2556def fetch.rt(+n: U32, t: Rt) -> Fl:
2557 match t:
2558 case RtMore{rv}:
2559 FlMore{rv, n}
2560 case RtBad{}:
2561 FlBad{None{}, U32.is_zero(n)}
2562 case RtDone{res, rest}:
2563 FlDone{res, rest}
2564
2565# 64 KiB of head past the body cap, as serve allows.
2566def fetch.over(+n: U32) -> Bool:
2567 Nat.is_lt(Nat.add(fetch.max(), 65536n), U32.to_nat(n))
2568
2569def fetch.piece.cap(over: Bool, +head: Bool, rv: Rv, +n2: U32, +len: U32, buf: Array<U32>) -> Fl:
2570 match over:
2571 case True{}:
2572 FlBad{None{}, False{}}
2573 case False{}:
2574 fetch.rt(n2, rv.step(U32.is_zero(len), head, rv, Bytes.Bytes{len, buf}))
2575
2576def fetch.piece(+head: Bool, rv: Rv, +n: U32, p: U32 & Array<U32>) -> Fl:
2577 (+len, buf) = p
2578 +n2 = (n + len : U32)
2579 fetch.piece.cap(fetch.over(n2), head, rv, n2, len, buf)
2580
2581def fetch.next(+head: Bool, rv: Rv, +n: U32, m: Socket & Result<&1, &1, U32 & String, U32 & Array<U32>>) -> Socket & Fl:
2582 (s, r) = m
2583 match r:
2584 case Fail{(+code, why)}:
2585 (s, FlBad{Some{err.or_late(code, ErrRead{code, why})}, U32.is_zero(n)})
2586 case Done{p}:
2587 (s, fetch.piece(head, rv, n, p))
2588
2589# Reads until the response is whole or cannot be; an empty read means the server closed.
2590@unsafe
2591def fetch.loop(+close: Bool, +head: Bool, +tls: Bool, +ms: U32, st: Socket & Fl) -> IO(Out):
2592 (s, fl) = st
2593 match fl:
2594 case FlMore{rv, +n}:
2595 do IO<Out>:
2596 m : Socket & Result<&1, &1, U32 & String, U32 & Array<U32>> <- io.recv.words(tls, s, 65536, ms)
2597 fetch.loop(close, head, tls, ms, fetch.next(head, rv, n, m))
2598 case FlBad{err, none}:
2599 fetch.failout(tls, s, err, none)
2600 case FlDone{res, rest}:
2601 fetch.hold(tls, close, s, res, rest)
2602
2603def exchange.sent(+tls: Bool, +ms: U32, +close: Bool, +head: Bool, m: Socket & Result<&1, &1, U32 & String, Unit>) -> IO(Out):
2604 (s, r) = m
2605 match r:
2606 case Fail{(+code, why)}:
2607 fetch.shut(tls, s, Fail{err.or_late(code, ErrWrite{code, why})}, True{})
2608 case Done{u}:
2609 fetch.loop(close, head, tls, ms, (s, FlMore{rv.start(), 0}))
2610
2611def exchange.go(+tls: Bool, +ms: U32, +close: Bool, +head: Bool, s: Socket, wire: Bytes.Bytes) -> IO(Out):
2612 do IO<Out>:
2613 sent : Socket & Result<&1, &1, U32 & String, Unit> <- io.send.bytes(tls, s, wire)
2614 exchange.sent(tls, ms, close, head, sent)
2615
2616def exchange.tup(o: Out) -> Maybe<&1, Socket> & Result<&1, &1, Err, Res> & Bytes.Bytes:
2617 match o:
2618 case OutFail{e, none}:
2619 (None{}, Fail{e}, Bytes.new(0))
2620 case OutDone{res, sock, rest}:
2621 (sock, Done{res}, rest)
2622
2623# One request on an open socket. Some{socket}: it can take another request.
2624def exchange(+tls: Bool, +ms: U32, +close: Bool, +head: Bool, s: Socket, wire: Bytes.Bytes) -> IO(Maybe<&1, Socket> & Result<&1, &1, Err, Res> & Bytes.Bytes):
2625 do IO<Maybe<&1, Socket> & Result<&1, &1, Err, Res> & Bytes.Bytes>:
2626 o : Out <- exchange.go(tls, ms, close, head, s, wire)
2627 return exchange.tup(o)
2628
2629# Paths to a PEM client chain and its private key for mutual TLS.
2630type Cert is Data:
2631 Cert{chain: String, key: String}
2632
2633type Proxy is Data:
2634 ProxyDirect{}
2635 ProxyVia{host: String, port: U32, authorization: String}
2636
2637type Route is Data:
2638 RouteDirect{tls: Bool, host: String, port: U32, cert: Maybe<&2, Cert>}
2639 RouteProxy{tls: Bool, host: String, port: U32, sni: String,
2640 authority: String, authorization: String, cert: Maybe<&2, Cert>}
2641
2642# Connection pool: idle sockets by origin and client identity, newest first, at most cap per key.
2643# fetch uses a fresh pool per call.
2644
2645type Conn is Type:
2646 Conn{tls: Bool, s: Socket}
2647 ConnH2{s: Socket, client: H2.Client}
2648
2649type Send is Type:
2650 Send{method: String, target: String, authority: String,
2651 headers: Map<&2, List<&2, String>>, body: Bytes.Bytes}
2652
2653type H2Step is Type:
2654 H2Reply{s: Socket, reply: H2.Reply}
2655 H2Sent{client: H2.Client, events: List<&1, H2.ClientEvent>,
2656 sent: Result<&1, &1, Err, Socket>}
2657 H2Events{s: Socket, client: H2.Client, result: Result<&1, &1, Err, Maybe<&1, Res>>}
2658 H2Received{client: H2.Client,
2659 answer: Socket & Result<&1, &1, U32 & String, U32 & Array<U32>>}
2660
2661type TunnelStep is Type:
2662 TunnelRead{s: Socket, raw: String}
2663 TunnelHead{s: Socket, raw: String, frame: Frame}
2664 TunnelGot{raw: String,
2665 answer: Socket & Result<&1, &1, U32 & String, U32 & Array<U32>>}
2666
2667type Pool is Type:
2668 Pool{cap: U32, idle: Map<&1, List<&1, Conn>>}
2669
2670def pool.new.with(+cap: U32) -> Pool:
2671 Pool{cap, Map.new(&1, List<&1, Conn>)}
2672
2673# Up to 8 idle sockets per origin.
2674def pool.new() -> Pool:
2675 pool.new.with(8)
2676
2677def pool.key(+scheme: String, +host: String, +port: U32) -> String:
2678 scheme ++ "://" ++ host ++ ":" ++ U32.show(port)
2679
2680def pool.key.cert(+base: String, cert: Maybe<&2, Cert>) -> String:
2681 match cert:
2682 case None{}:
2683 base
2684 case Some{Cert{+chain, +key}}:
2685 base ++ "|cert:" ++ Nat.show(String.length(chain)) ++ ":" ++ chain
2686 ++ Nat.show(String.length(key)) ++ ":" ++ key
2687
2688def pool.take.of(+cap: U32, +key: String, r: Map<&1, List<&1, Conn>> & Maybe<&1, List<&1, Conn>>) -> Pool & Maybe<&1, Conn>:
2689 (m, got) = r
2690 match got:
2691 case None{}:
2692 (Pool{cap, m}, None{})
2693 case Some{xs}:
2694 match xs:
2695 case Nil{}:
2696 (Pool{cap, m}, None{})
2697 case Con{c, t}:
2698 (Pool{cap, Map.set(&1, List<&1, Conn>, m, key, t)}, Some{c})
2699
2700# The socket given back last.
2701def pool.take(p: Pool, +key: String) -> Pool & Maybe<&1, Conn>:
2702 Pool{+cap, idle} = p
2703 pool.take.of(cap, key, Map.pop(&1, List<&1, Conn>, idle, key))
2704
2705def conn.close(c: Conn) -> IO(Unit):
2706 match c:
2707 case Conn{tls, s}:
2708 io.close(tls, s)
2709 case ConnH2{s, client}:
2710 Wire.tls.close(s)
2711
2712# The first n sockets; the rest are closed.
2713def conns.cut(xs: List<&1, Conn>, n: Nat) -> IO(List<&1, Conn>):
2714 match xs:
2715 case Nil{}:
2716 IO.pure(List<&1, Conn>, Nil{})
2717 case Con{c, t}:
2718 match n:
2719 case 0n:
2720 do IO<List<&1, Conn>>:
2721 conn.close(c)
2722 conns.cut(t, 0n)
2723 case 1n+k:
2724 do IO<List<&1, Conn>>:
2725 r : List<&1, Conn> <- conns.cut(t, k)
2726 return c <> r
2727
2728def pool.give.of(+cap: U32, +key: String, c: Conn, limit: Nat,
2729 r: Map<&1, List<&1, Conn>> & Maybe<&1, List<&1, Conn>>) -> IO(Pool):
2730 (m, old) = r
2731 do IO<Pool>:
2732 xs : List<&1, Conn> <- conns.cut(c <> Maybe.default(&1, List<&1, Conn>, old, Nil{}), limit)
2733 return Pool{cap, Map.set(&1, List<&1, Conn>, m, key, xs)}
2734
2735# Past the limit (cap for HTTP/1.1, one session for HTTP/2), close the oldest idle connection.
2736def pool.give(p: Pool, +key: String, c: Conn) -> IO(Pool):
2737 Pool{+cap, idle} = p
2738 match c:
2739 case Conn{tls, s}:
2740 pool.give.of(cap, key, Conn{tls, s}, U32.to_nat(cap), Map.pop(&1, List<&1, Conn>, idle, key))
2741 case ConnH2{s, client}:
2742 pool.give.of(cap, key, ConnH2{s, client}, Bool.pick(Nat, U32.is_zero(cap), 0n, 1n),
2743 Map.pop(&1, List<&1, Conn>, idle, key))
2744
2745def pool.close.go(xs: List<&1, List<&1, Conn>>) -> IO(Unit):
2746 match xs:
2747 case Nil{}:
2748 IO.pure(Unit, Unit{})
2749 case Con{cs, t}:
2750 do IO<Unit>:
2751 none : List<&1, Conn> <- conns.cut(cs, 0n)
2752 pool.close.go(t)
2753
2754def pool.close(p: Pool) -> IO(Unit):
2755 Pool{cap, idle} = p
2756 pool.close.go(Map.values(&1, List<&1, Conn>, idle))
2757
2758# RFC 9110 §9.2.2
2759def pool.idempotent(+method: String) -> Bool:
2760 Bool.or(String.eq(method, "GET"), Bool.or(String.eq(method, "HEAD"), Bool.or(String.eq(method, "OPTIONS"), Bool.or(String.eq(method, "TRACE"), Bool.or(String.eq(method, "PUT"), String.eq(method, "DELETE"))))))
2761
2762def conn.tls(m: Socket & Result<&1, &1, U32 & String, Unit>) -> IO(Result<&1, &1, Err, Conn>):
2763 (s, r) = m
2764 match r:
2765 case Fail{(+code, why)}:
2766 do IO<Result<&1, &1, Err, Conn>>:
2767 Wire.tls.close(s)
2768 return Fail{err.or_late(code, ErrTls{code, why})}
2769 case Done{u}:
2770 IO.pure(Result<&1, &1, Err, Conn>, Done{Conn{True{}, s}})
2771
2772def conn.h2.sent(client: H2.Client, r: Socket & Result<&1, &1, U32 & String, Unit>) -> IO(Result<&1, &1, Err, Conn>):
2773 (s, sent) = r
2774 match sent:
2775 case Fail{(+code, why)}:
2776 do IO<Result<&1, &1, Err, Conn>>:
2777 Wire.tls.close(s)
2778 return Fail{err.or_late(code, ErrWrite{code, why})}
2779 case Done{u}:
2780 IO.pure(Result<&1, &1, Err, Conn>, Done{ConnH2{s, client}})
2781
2782def conn.h2.start(s: Socket, r: H2.Client & HBytes.Bytes) -> IO(Result<&1, &1, Err, Conn>):
2783 (client, HBytes.Bytes{len, buf}) = r
2784 do IO<Result<&1, &1, Err, Conn>>:
2785 sent : Socket & Result<&1, &1, U32 & String, Unit> <- Wire.tls.send.words(s, len, buf)
2786 conn.h2.sent(client, sent)
2787
2788def conn.tls.protocol(proto: String, s: Socket) -> IO(Result<&1, &1, Err, Conn>):
2789 match proto:
2790 case "h2":
2791 conn.h2.start(s, H2.client.start())
2792 case "http/1.1":
2793 IO.pure(Result<&1, &1, Err, Conn>, Done{Conn{True{}, s}})
2794 case "":
2795 IO.pure(Result<&1, &1, Err, Conn>, Done{Conn{True{}, s}})
2796 case other:
2797 do IO<Result<&1, &1, Err, Conn>>:
2798 Wire.tls.close(s)
2799 return Fail{ErrTls{71, "unsupported ALPN: " ++ other}}
2800
2801def conn.tls.alpn(m: Socket & Result<&1, &1, U32 & String, String>) -> IO(Result<&1, &1, Err, Conn>):
2802 (s, r) = m
2803 match r:
2804 case Fail{(+code, why)}:
2805 do IO<Result<&1, &1, Err, Conn>>:
2806 Wire.tls.close(s)
2807 return Fail{err.or_late(code, ErrTls{code, why})}
2808 case Done{proto}:
2809 conn.tls.protocol(proto, s)
2810
2811def conn.secure.no.cert(offer: Bool, s: Socket, host: String, +ms: U32) ->
2812 IO(Result<&1, &1, Err, Conn>):
2813 match offer:
2814 case True{}:
2815 do IO<Result<&1, &1, Err, Conn>>:
2816 hs : Socket & Result<&1, &1, U32 & String, String> <-
2817 Wire.tls.connect.alpn(s, host, ms, "h2,http/1.1")
2818 conn.tls.alpn(hs)
2819 case False{}:
2820 do IO<Result<&1, &1, Err, Conn>>:
2821 hs : Socket & Result<&1, &1, U32 & String, Unit> <- Wire.tls.connect(s, host, ms)
2822 conn.tls(hs)
2823
2824def conn.secure.tls(cert: Maybe<&2, Cert>, s: Socket, host: String, +ms: U32,
2825 offer: Bool) -> IO(Result<&1, &1, Err, Conn>):
2826 match cert:
2827 case None{}:
2828 conn.secure.no.cert(offer, s, host, ms)
2829 case Some{Cert{chain, key}}:
2830 do IO<Result<&1, &1, Err, Conn>>:
2831 hs : Socket & Result<&1, &1, U32 & String, Unit> <-
2832 Wire.tls.connect.cert(s, host, ms, chain, key)
2833 conn.tls(hs)
2834
2835# A failed handshake is an error, never plaintext.
2836def conn.secure(+ms: U32, sni: String, s: Socket, tls: Bool,
2837 cert: Maybe<&2, Cert>, offer: Bool) -> IO(Result<&1, &1, Err, Conn>):
2838 match tls:
2839 case False{}:
2840 IO.pure(Result<&1, &1, Err, Conn>, Done{Conn{False{}, s}})
2841 case True{}:
2842 conn.secure.tls(cert, s, sni, ms, offer)
2843
2844def conn.made(+ms: U32, sni: String, tls: Bool, cert: Maybe<&2, Cert>,
2845 offer: Bool, r: Result<&1, &1, U32 & String, Socket>) ->
2846 IO(Result<&1, &1, Err, Conn>):
2847 match r:
2848 case Fail{(+code, why)}:
2849 IO.pure(Result<&1, &1, Err, Conn>, Fail{err.or_late(code, ErrConnect{code, why})})
2850 case Done{s}:
2851 conn.secure(ms, sni, s, tls, cert, offer)
2852
2853def conn.open(+tls: Bool, +ms: U32, sni: String, ip: String, port: U32) ->
2854 IO(Result<&1, &1, Err, Conn>):
2855 do IO<Result<&1, &1, Err, Conn>>:
2856 c : Result<&1, &1, U32 & String, Socket> <- Wire.connect(ip, port, ms)
2857 conn.made(ms, sni, tls, None{}, False{}, c)
2858
2859# ponytail: addresses are tried in order, not raced; a broken first route can consume the step timeout.
2860type Dial is Type:
2861 Dial{port: U32, ms: U32, deadline: Nat, action: IO(Result<&1, &1, U32 & String, Socket>)}
2862
2863def conn.dial.time(+ip: String, +port: U32, +deadline: Nat, now: Nat, expired: Bool) ->
2864 IO(Result<&1, &1, U32 & String, Socket>):
2865 match expired:
2866 case True{}:
2867 IO.pure(Result<&1, &1, U32 & String, Socket>, Fail{(60, "connect timeout")})
2868 case False{}:
2869 Wire.connect(ip, port, U32.from_nat(Nat.sub(deadline, now)))
2870
2871def conn.dial.with(+ip: String, +port: U32, +ms: U32, +deadline: Nat, +now: Nat, unlimited: Bool) ->
2872 IO(Result<&1, &1, U32 & String, Socket>):
2873 match unlimited:
2874 case True{}:
2875 Wire.connect(ip, port, 0)
2876 case False{}:
2877 conn.dial.time(ip, port, deadline, now, Nat.is_le(deadline, now))
2878
2879def conn.dial.try(+ip: String, +port: U32, +ms: U32, +deadline: Nat) ->
2880 IO(Result<&1, &1, U32 & String, Socket>):
2881 do IO<Result<&1, &1, U32 & String, Socket>>:
2882 now : Nat <- IO.now()
2883 conn.dial.with(ip, port, ms, deadline, now, U32.is_zero(ms))
2884
2885def conn.dial.after(r: Result<&1, &1, U32 & String, Socket>, ip: String, +port: U32, +ms: U32, +deadline: Nat) ->
2886 IO(Result<&1, &1, U32 & String, Socket>):
2887 match r:
2888 case Done{s}:
2889 IO.pure(Result<&1, &1, U32 & String, Socket>, Done{s})
2890 case Fail{e}:
2891 conn.dial.try(ip, port, ms, deadline)
2892
2893def conn.dial.more(prev: IO(Result<&1, &1, U32 & String, Socket>), ip: String, +port: U32, +ms: U32, +deadline: Nat) ->
2894 IO(Result<&1, &1, U32 & String, Socket>):
2895 do IO<Result<&1, &1, U32 & String, Socket>>:
2896 r : Result<&1, &1, U32 & String, Socket> <- prev
2897 conn.dial.after(r, ip, port, ms, deadline)
2898
2899def conn.dial.fold(d: Dial, ip: String) -> Dial:
2900 Dial{+port, +ms, +deadline, action} = d
2901 Dial{port, ms, deadline, conn.dial.more(action, ip, port, ms, deadline)}
2902
2903def conn.dial.run(d: Dial) -> IO(Result<&1, &1, U32 & String, Socket>):
2904 Dial{port, ms, deadline, action} = d
2905 action
2906
2907def conn.dial.all(+port: U32, +ms: U32, +start: Nat, first: String, rest: List<&2, String>) ->
2908 IO(Result<&1, &1, U32 & String, Socket>):
2909 match rest:
2910 case Nil{}:
2911 Wire.connect(first, port, ms)
2912 case Con{ip, tail}:
2913 +deadline = Nat.add(start, U32.to_nat(ms))
2914 conn.dial.run(List.foldl(~&2, ~String, ~Dial, ~conn.dial.fold, Con{ip, tail},
2915 Dial{port, ms, deadline, Wire.connect(first, port, ms)}))
2916
2917def conn.open.all(+tls: Bool, +ms: U32, +host: String, +port: U32,
2918 ips: List<&2, String>, cert: Maybe<&2, Cert>, offer: Bool) ->
2919 IO(Result<&1, &1, Err, Conn>):
2920 match ips:
2921 case Nil{}:
2922 IO.pure(Result<&1, &1, Err, Conn>, Fail{ErrDns{}})
2923 case Con{addr, rest}:
2924 do IO<Result<&1, &1, Err, Conn>>:
2925 start : Nat <- IO.now()
2926 r : Result<&1, &1, U32 & String, Socket> <- conn.dial.all(port, ms, start, addr, rest)
2927 conn.made(ms, host, tls, cert, offer, r)
2928
2929def proxy.auth.safe(s: String) -> Bool:
2930 match s:
2931 case SNil{}:
2932 True{}
2933 case SCon{Chr{+c}, rest}:
2934 Bool.and(U32.is_ge(c, 32), Bool.and(U32.is_ne(c, 127), proxy.auth.safe(rest)))
2935
2936def proxy.auth.checked(+decoded: String, valid: Bool) -> Maybe<&2, String>:
2937 match valid:
2938 case False{}:
2939 None{}
2940 case True{}:
2941 Some{"Basic " ++ Bytes.to_base64(Bytes.from_string(decoded))}
2942
2943def proxy.auth.value(m: Maybe<&2, String>) -> Maybe<&2, String>:
2944 match m:
2945 case None{}:
2946 None{}
2947 case Some{+decoded}:
2948 proxy.auth.checked(decoded, Bool.and(Url.has(decoded, 58), proxy.auth.safe(decoded)))
2949
2950def proxy.from.abs(authorization: String, m: Maybe<&2, Url.Abs>) -> Maybe<&2, Proxy>:
2951 match m:
2952 case None{}:
2953 None{}
2954 case Some{Url.Abs{scheme, host, port, target}}:
2955 Some{ProxyVia{host, port, authorization}}
2956
2957def proxy.from.user(user: String, host: String) -> Maybe<&2, Proxy>:
2958 do Maybe<&2, Proxy>:
2959 authorization : String <- proxy.auth.value(Url.pct.decode(user))
2960 proxy.from.abs(authorization, Url.absolute("http://" ++ host))
2961
2962def proxy.from.authority(has_user: Bool, authority: String, split: String & String) ->
2963 Maybe<&2, Proxy>:
2964 match has_user:
2965 case False{}:
2966 proxy.from.abs("", Url.absolute("http://" ++ authority))
2967 case True{}:
2968 (user, host) = split
2969 proxy.from.user(user, host)
2970
2971def proxy.from.parts(parts: String & String) -> Maybe<&2, Proxy>:
2972 (+authority, path) = parts
2973 match path:
2974 case SNil{}:
2975 proxy.from.authority(Url.has(authority, 64), authority, Url.take_to(authority, 64))
2976 case other:
2977 None{}
2978
2979def proxy.from.url.if(valid: Bool, raw: String) -> Maybe<&2, Proxy>:
2980 match valid:
2981 case False{}:
2982 None{}
2983 case True{}:
2984 proxy.from.parts(Url.take_to(String.drop(raw, 7n), 47))
2985
2986def proxy.from.url(+raw: String) -> Maybe<&2, Proxy>:
2987 proxy.from.url.if(String.starts_with(String.to_lower(raw), "http://"), raw)
2988
2989def proxy.no.domain(+host: String, +suffix: String) -> Bool:
2990 Bool.or(String.eq(host, suffix), String.ends_with(host, "." ++ suffix))
2991
2992def proxy.no.suffix(+host: String, +raw: String) -> Bool:
2993 match raw:
2994 case SCon{Chr{46}, +suffix}:
2995 proxy.no.domain(host, suffix)
2996 case other:
2997 proxy.no.domain(host, raw)
2998
2999def proxy.no.port(valid: Bool, +host: String, suffix: String) -> Bool:
3000 match valid:
3001 case False{}:
3002 False{}
3003 case True{}:
3004 proxy.no.suffix(host, suffix)
3005
3006def proxy.no.named(+host: String, +port: U32, parts: String & String) -> Bool:
3007 (suffix, port_text) = parts
3008 match port_text:
3009 case SNil{}:
3010 proxy.no.suffix(host, suffix)
3011 case other:
3012 proxy.no.port(String.eq(port_text, U32.show(port)), host, suffix)
3013
3014def proxy.no.literal(+host: String, +port: U32, +name: String) -> Bool:
3015 Bool.or(String.eq(name, host), Bool.or(String.eq(name, "[" ++ host ++ "]"),
3016 Bool.or(String.eq(name, host ++ ":" ++ U32.show(port)),
3017 String.eq(name, "[" ++ host ++ "]:" ++ U32.show(port)))))
3018
3019def proxy.no.token(+host: String, +port: U32, token: String) -> Bool:
3020 +name = String.to_lower(trim(token))
3021 Bool.or(String.eq(name, "*"),
3022 Bool.or(proxy.no.literal(host, port, name),
3023 Bool.and(Bool.not(Url.has(host, 58)),
3024 proxy.no.named(host, port, Url.take_to(name, 58)))))
3025
3026def proxy.no.list(xs: List<&2, String>, +host: String, +port: U32) -> Bool:
3027 match xs:
3028 case Nil{}:
3029 False{}
3030 case Con{token, rest}:
3031 Bool.or(proxy.no.token(host, port, token), proxy.no.list(rest, host, port))
3032
3033def proxy.no_match(+host: String, +port: U32, no_proxy: String) -> Bool:
3034 proxy.no.list(String.split(no_proxy, ','), String.to_lower(host), port)
3035
3036def proxy.env.value(r: Result<&1, &1, U32 & String, String>) -> String:
3037 match r:
3038 case Fail{e}:
3039 ""
3040 case Done{value}:
3041 value
3042
3043def proxy.env.lower(r: Result<&1, &1, U32 & String, String>, upper: String) ->
3044 IO(String):
3045 match r:
3046 case Done{value}:
3047 IO.pure(String, value)
3048 case Fail{e}:
3049 do IO<String>:
3050 got : Result<&1, &1, U32 & String, String> <- IO.get_env(upper)
3051 return proxy.env.value(got)
3052
3053def proxy.env(lower: String, upper: String) -> IO(String):
3054 do IO<String>:
3055 got : Result<&1, &1, U32 & String, String> <- IO.get_env(lower)
3056 proxy.env.lower(got, upper)
3057
3058def proxy.from.env(value: String) -> Maybe<&2, Proxy>:
3059 match value:
3060 case SNil{}:
3061 Some{ProxyDirect{}}
3062 case other:
3063 proxy.from.url(value)
3064
3065def proxy.choose(bypass: Bool, value: String) -> Maybe<&2, Proxy>:
3066 match bypass:
3067 case True{}:
3068 Some{ProxyDirect{}}
3069 case False{}:
3070 proxy.from.env(value)
3071
3072def proxy.select(+scheme: String, +host: String, +port: U32) ->
3073 IO(Maybe<&2, Proxy>):
3074 +secure = String.eq(scheme, "https")
3075 do IO<Maybe<&2, Proxy>>:
3076 bypass : String <- proxy.env("no_proxy", "NO_PROXY")
3077 value : String <- proxy.env(Bool.pick(String, secure, "https_proxy", "http_proxy"),
3078 Bool.pick(String, secure, "HTTPS_PROXY", "HTTP_PROXY"))
3079 return proxy.choose(proxy.no_match(host, port, bypass), value)
3080
3081def h2.header.skip(+name: String) -> Bool:
3082 match name:
3083 case SCon{Chr{58}, rest}:
3084 True{}
3085 case other:
3086 Bool.or(req.reserved(name),
3087 Bool.or(String.eq(name, "keep-alive"),
3088 Bool.or(String.eq(name, "proxy-connection"),
3089 Bool.or(String.eq(name, "upgrade"), String.eq(name, "te")))))
3090
3091def h2.header.mode(+name: String) -> U32:
3092 Bool.pick(U32,
3093 Bool.or(String.eq(name, "authorization"),
3094 Bool.or(String.eq(name, "cookie"), String.eq(name, "proxy-authorization"))),
3095 2, 0)
3096
3097def h2.header.values(+name: String, +mode: U32, vs: List<&2, String>) -> List<&2, Hpack.Field>:
3098 match vs:
3099 case Nil{}:
3100 Nil{}
3101 case Con{v, tail}:
3102 Hpack.Field{name, sanitize(v), mode} <> h2.header.values(name, mode, tail)
3103
3104def h2.header.tokens(vs: List<&2, String>) -> List<&2, String>:
3105 match vs:
3106 case Nil{}:
3107 Nil{}
3108 case Con{value, rest}:
3109 List.append(&2, String, String.split(value, ','), h2.header.tokens(rest))
3110
3111def h2.header.nominated.one(enabled: Bool, vs: List<&2, String>,
3112 rest: List<&2, String>) -> List<&2, String>:
3113 match enabled:
3114 case True{}:
3115 List.append(&2, String, h2.header.tokens(vs), rest)
3116 case False{}:
3117 rest
3118
3119def h2.header.nominated(xs: List<&2, Sigma<&2, &2, String, _ => List<&2, String>>>) ->
3120 List<&2, String>:
3121 match xs:
3122 case Nil{}:
3123 Nil{}
3124 case (name, values) <> tail:
3125 h2.header.nominated.one(String.eq(String.to_lower(name), "connection"),
3126 values, h2.header.nominated(tail))
3127
3128def h2.header.has(xs: List<&2, String>, +key: String) -> Bool:
3129 match xs:
3130 case Nil{}:
3131 False{}
3132 case Con{value, rest}:
3133 Bool.or(String.eq(String.to_lower(trim(value)), key), h2.header.has(rest, key))
3134
3135def h2.header.item(skip: Bool, +name: String, vs: List<&2, String>,
3136 tail: List<&2, Hpack.Field>) -> List<&2, Hpack.Field>:
3137 match skip:
3138 case True{}:
3139 tail
3140 case False{}:
3141 List.append(&2, Hpack.Field, h2.header.values(name, h2.header.mode(name), vs), tail)
3142
3143def h2.header.items(xs: List<&2, Sigma<&2, &2, String, _ => List<&2, String>>>,
3144 +nominated: List<&2, String>) -> List<&2, Hpack.Field>:
3145 match xs:
3146 case Nil{}:
3147 Nil{}
3148 case (name, values) <> tail:
3149 +key = String.to_lower(name)
3150 h2.header.item(Bool.or(h2.header.skip(key), h2.header.has(nominated, key)),
3151 key, values, h2.header.items(tail, nominated))
3152
3153def h2.request.fields(+method: String, target: String, authority: String,
3154 headers: Map<&2, List<&2, String>>) -> List<&2, Hpack.Field>:
3155 +xs = Map.to_list(&2, List<&2, String>, headers)
3156 List.append(&2, Hpack.Field,
3157 [Hpack.Field{":method", method, 0}, Hpack.Field{":scheme", "https", 0},
3158 Hpack.Field{":authority", authority, 0}, Hpack.Field{":path", target, 0}],
3159 h2.header.items(xs, h2.header.nominated(xs)))
3160
3161def h2.response.status.value(+value: String, valid: Bool) -> Maybe<&2, U32>:
3162 match valid:
3163 case False{}:
3164 None{}
3165 case True{}:
3166 parse_u32(value)
3167
3168def h2.response.status(xs: List<&2, Hpack.Field>) -> Maybe<&2, U32>:
3169 match xs:
3170 case Nil{}:
3171 None{}
3172 case Con{Hpack.Field{name, +value, mode}, tail}:
3173 match name:
3174 case ":status":
3175 h2.response.status.value(value, Nat.is_eq(String.length(value), 3n))
3176 case other:
3177 h2.response.status(tail)
3178
3179def h2.response.headers(xs: List<&2, Hpack.Field>, acc: Map<&2, List<&2, String>>) ->
3180 Map<&2, List<&2, String>>:
3181 match xs:
3182 case Nil{}:
3183 acc
3184 case Con{Hpack.Field{name, value, mode}, tail}:
3185 match name:
3186 case SCon{Chr{58}, rest}:
3187 h2.response.headers(tail, acc)
3188 case other:
3189 h2.response.headers(tail, add(acc, String.to_lower(name), value))
3190
3191def h2.response.final(interim: Bool, +status: U32, headers: List<&2, Hpack.Field>,
3192 body: HBytes.Bytes) -> Result<&1, &1, Err, Maybe<&1, Res>>:
3193 match interim:
3194 case True{}:
3195 Done{None{}}
3196 case False{}:
3197 HBytes.Bytes{len, buf} = body
3198 Done{Some{Res{status, h2.response.headers(headers, empty()), Bytes.Bytes{len, buf}}}}
3199
3200def h2.response.valid(valid: Bool, +status: U32, headers: List<&2, Hpack.Field>,
3201 body: HBytes.Bytes) -> Result<&1, &1, Err, Maybe<&1, Res>>:
3202 match valid:
3203 case False{}:
3204 Fail{ErrBad{}}
3205 case True{}:
3206 h2.response.final(U32.is_lt(status, 200), status, headers, body)
3207
3208def h2.response.parsed(m: Maybe<&2, U32>, headers: List<&2, Hpack.Field>,
3209 body: HBytes.Bytes) -> Result<&1, &1, Err, Maybe<&1, Res>>:
3210 match m:
3211 case None{}:
3212 Fail{ErrBad{}}
3213 case Some{+status}:
3214 h2.response.valid(Bool.and(U32.is_ge(status, 100), U32.is_lt(status, 600)),
3215 status, headers, body)
3216
3217def h2.response(+fields: List<&2, Hpack.Field>, body: HBytes.Bytes) ->
3218 Result<&1, &1, Err, Maybe<&1, Res>>:
3219 h2.response.parsed(h2.response.status(fields), fields, body)
3220
3221def h2.event.fold(acc: Result<&1, &1, Err, Maybe<&1, Res>>,
3222 event: H2.ClientEvent) -> Result<&1, &1, Err, Maybe<&1, Res>>:
3223 match acc:
3224 case Fail{e}:
3225 Fail{e}
3226 case Done{Some{res}}:
3227 Done{Some{res}}
3228 case Done{None{}}:
3229 match event:
3230 case H2.Response{id, headers, body}:
3231 h2.response(headers, body)
3232 case H2.Reset{id, code}:
3233 Fail{ErrBad{}}
3234 case H2.Shutdown{last, code}:
3235 Done{None{}}
3236 case H2.Pong{data}:
3237 Done{None{}}
3238
3239def h2.send.report(r: Socket & Result<&1, &1, U32 & String, Unit>) ->
3240 IO(Result<&1, &1, Err, Socket>):
3241 (s, sent) = r
3242 match sent:
3243 case Fail{(+code, why)}:
3244 do IO<Result<&1, &1, Err, Socket>>:
3245 Wire.tls.close(s)
3246 return Fail{err.or_late(code, ErrWrite{code, why})}
3247 case Done{unit}:
3248 IO.pure(Result<&1, &1, Err, Socket>, Done{s})
3249
3250def h2.send.one(prev: Result<&1, &1, Err, Socket>, b: HBytes.Bytes) ->
3251 IO(Result<&1, &1, Err, Socket>):
3252 match prev:
3253 case Fail{e}:
3254 IO.pure(Result<&1, &1, Err, Socket>, Fail{e})
3255 case Done{s}:
3256 HBytes.Bytes{len, buf} = b
3257 do IO<Result<&1, &1, Err, Socket>>:
3258 sent : Socket & Result<&1, &1, U32 & String, Unit> <- Wire.tls.send.words(s, len, buf)
3259 h2.send.report(sent)
3260
3261def h2.send.fold(prev: IO(Result<&1, &1, Err, Socket>), b: HBytes.Bytes) ->
3262 IO(Result<&1, &1, Err, Socket>):
3263 do IO<Result<&1, &1, Err, Socket>>:
3264 r : Result<&1, &1, Err, Socket> <- prev
3265 h2.send.one(r, b)
3266
3267def h2.send(xs: List<&1, HBytes.Bytes>, s: Socket) -> IO(Result<&1, &1, Err, Socket>):
3268 List.foldl(~&1, ~HBytes.Bytes, ~IO(Result<&1, &1, Err, Socket>), ~h2.send.fold,
3269 xs, IO.pure(Result<&1, &1, Err, Socket>, Done{s}))
3270
3271def h2.received.step(over: Bool, s: Socket, client: H2.Client,
3272 +len: U32, buf: Array<U32>) -> H2Step:
3273 match over:
3274 case True{}:
3275 H2Reply{s, H2.Failed{H2.Error{1, True{}, 0}}}
3276 case False{}:
3277 H2Reply{s, H2.client.receive(client, HBytes.Bytes{len, buf})}
3278
3279def h2.fail(s: Socket, e: Err) -> IO(Result<&1, &1, Err, Conn & Res>):
3280 do IO<Result<&1, &1, Err, Conn & Res>>:
3281 Wire.tls.close(s)
3282 return Fail{e}
3283
3284def h2.loop(n: Nat, step: H2Step, +ms: U32, +used: U32) ->
3285 IO(Result<&1, &1, Err, Conn & Res>):
3286 match n:
3287 case 0n:
3288 match step:
3289 case H2Reply{s, reply}:
3290 h2.fail(s, ErrBad{})
3291 case H2Sent{client, events, sent}:
3292 match sent:
3293 case Fail{e}:
3294 IO.pure(Result<&1, &1, Err, Conn & Res>, Fail{e})
3295 case Done{s}:
3296 h2.fail(s, ErrBad{})
3297 case H2Events{s, client, result}:
3298 h2.fail(s, ErrBad{})
3299 case H2Received{client, answer}:
3300 (s, r) = answer
3301 h2.fail(s, ErrBad{})
3302 case 1n+p:
3303 match step:
3304 case H2Reply{s, reply}:
3305 match reply:
3306 case H2.Failed{error}:
3307 h2.fail(s, ErrBad{})
3308 case H2.Ready{client, writes, events}:
3309 do IO<Result<&1, &1, Err, Conn & Res>>:
3310 sent : Result<&1, &1, Err, Socket> <- h2.send(writes, s)
3311 h2.loop(p, H2Sent{client, events, sent}, ms, used)
3312 case H2Sent{client, events, sent}:
3313 match sent:
3314 case Fail{e}:
3315 IO.pure(Result<&1, &1, Err, Conn & Res>, Fail{e})
3316 case Done{s}:
3317 h2.loop(p, H2Events{s, client,
3318 List.foldl(~&1, ~H2.ClientEvent,
3319 ~Result<&1, &1, Err, Maybe<&1, Res>>, ~h2.event.fold,
3320 events, Done{None{}})}, ms, used)
3321 case H2Events{s, client, result}:
3322 match result:
3323 case Fail{e}:
3324 h2.fail(s, e)
3325 case Done{Some{res}}:
3326 IO.pure(Result<&1, &1, Err, Conn & Res>,
3327 Done{(ConnH2{s, client}, res)})
3328 case Done{None{}}:
3329 do IO<Result<&1, &1, Err, Conn & Res>>:
3330 r : Socket & Result<&1, &1, U32 & String, U32 & Array<U32>> <-
3331 Wire.tls.recv.words(s, 16384, ms)
3332 h2.loop(p, H2Received{client, r}, ms, used)
3333 case H2Received{client, answer}:
3334 match answer:
3335 case (s, Fail{(+code, why)}):
3336 h2.fail(s, err.or_late(code, ErrRead{code, why}))
3337 case (s, Done{(0, buf)}):
3338 h2.fail(s, ErrBad{})
3339 case (s, Done{(+len, buf)}):
3340 +total = (used + len : U32)
3341 h2.loop(p, h2.received.step(fetch.over(total), s, client, len, buf), ms, total)
3342
3343def h2.exchange(s: Socket, client: H2.Client, +ms: U32, request: Send) ->
3344 IO(Result<&1, &1, Err, Conn & Res>):
3345 Send{method, target, authority, headers, Bytes.Bytes{len, buf}} = request
3346 h2.loop(Nat.mul(4n, Nat.add(fetch.max(), 65536n)),
3347 H2Reply{s, H2.client.request(client,
3348 h2.request.fields(method, target, authority, headers), HBytes.Bytes{len, buf})},
3349 ms, 0)
3350
3351def proxy.connect.fail(s: Socket, e: Err) -> IO(Result<&1, &1, Err, Conn>):
3352 do IO<Result<&1, &1, Err, Conn>>:
3353 io.close(False{}, s)
3354 return Fail{e}
3355
3356def proxy.connect.extra(m: Maybe<&2, String>, s: Socket, +ms: U32,
3357 sni: String, cert: Maybe<&2, Cert>) -> IO(Result<&1, &1, Err, Conn>):
3358 match m:
3359 case None{}:
3360 proxy.connect.fail(s, ErrBad{})
3361 case Some{rest}:
3362 match rest:
3363 case SNil{}:
3364 conn.secure(ms, sni, s, True{}, cert, True{})
3365 case other:
3366 proxy.connect.fail(s, ErrBad{})
3367
3368def proxy.connect.status(ok: Bool, +status: U32, raw: String, s: Socket,
3369 +ms: U32, sni: String, cert: Maybe<&2, Cert>) ->
3370 IO(Result<&1, &1, Err, Conn>):
3371 match ok:
3372 case False{}:
3373 proxy.connect.fail(s, ErrConnect{status, "proxy CONNECT refused"})
3374 case True{}:
3375 proxy.connect.extra(after(raw, True{}), s, ms, sni, cert)
3376
3377def proxy.connect.finish(res: Res, raw: String, s: Socket, +ms: U32,
3378 sni: String, cert: Maybe<&2, Cert>) -> IO(Result<&1, &1, Err, Conn>):
3379 Res{+status, headers, body} = res
3380 proxy.connect.status(Bool.and(U32.is_ge(status, 200), U32.is_lt(status, 300)),
3381 status, raw, s, ms, sni, cert)
3382
3383def proxy.connect.frame(raw: String, over: Bool) -> Frame:
3384 match over:
3385 case True{}:
3386 FrameBad{}
3387 case False{}:
3388 frame(raw, False{}, True{})
3389
3390def proxy.connect.chunk(empty: Bool, s: Socket, raw: String,
3391 +len: U32, buf: Array<U32>) -> TunnelStep:
3392 match empty:
3393 case True{}:
3394 TunnelHead{s, raw, FrameBad{}}
3395 case False{}:
3396 TunnelRead{s, raw ++ Bytes.to_string(Bytes.Bytes{len, buf})}
3397
3398def proxy.connect.loop(n: Nat, step: TunnelStep, +ms: U32, +sni: String,
3399 +cert: Maybe<&2, Cert>) -> IO(Result<&1, &1, Err, Conn>):
3400 match n:
3401 case 0n:
3402 match step:
3403 case TunnelRead{s, raw}:
3404 proxy.connect.fail(s, ErrBad{})
3405 case TunnelHead{s, raw, result}:
3406 proxy.connect.fail(s, ErrBad{})
3407 case TunnelGot{raw, answer}:
3408 (s, result) = answer
3409 proxy.connect.fail(s, ErrBad{})
3410 case 1n+p:
3411 match step:
3412 case TunnelRead{s, +raw}:
3413 proxy.connect.loop(p, TunnelHead{s, raw,
3414 proxy.connect.frame(raw, Nat.is_gt(String.length(raw), 65536n))},
3415 ms, sni, cert)
3416 case TunnelHead{s, raw, result}:
3417 match result:
3418 case FrameBad{}:
3419 proxy.connect.fail(s, ErrBad{})
3420 case FrameMore{}:
3421 do IO<Result<&1, &1, Err, Conn>>:
3422 answer : Socket & Result<&1, &1, U32 & String, U32 & Array<U32>> <-
3423 io.recv.words(False{}, s, 4096, ms)
3424 proxy.connect.loop(p, TunnelGot{raw, answer}, ms, sni, cert)
3425 case FrameDone{res}:
3426 proxy.connect.finish(res, raw, s, ms, sni, cert)
3427 case TunnelGot{raw, answer}:
3428 match answer:
3429 case (s, Fail{(+code, why)}):
3430 proxy.connect.fail(s, err.or_late(code, ErrRead{code, why}))
3431 case (s, Done{(+len, buf)}):
3432 proxy.connect.loop(p,
3433 proxy.connect.chunk(U32.is_zero(len), s, raw, len, buf),
3434 ms, sni, cert)
3435
3436def proxy.connect.header(+authority: String, authorization: String) -> String:
3437 match authorization:
3438 case SNil{}:
3439 "CONNECT " ++ authority ++ " HTTP/1.1\r\nHost: " ++ authority ++ "\r\n\r\n"
3440 case other:
3441 "CONNECT " ++ authority ++ " HTTP/1.1\r\nHost: " ++ authority
3442 ++ "\r\nProxy-Authorization: " ++ authorization ++ "\r\n\r\n"
3443
3444def proxy.connect.sent(r: Socket & Result<&1, &1, U32 & String, Unit>,
3445 +ms: U32, sni: String, cert: Maybe<&2, Cert>) ->
3446 IO(Result<&1, &1, Err, Conn>):
3447 (s, sent) = r
3448 match sent:
3449 case Fail{(+code, why)}:
3450 proxy.connect.fail(s, err.or_late(code, ErrWrite{code, why}))
3451 case Done{unit}:
3452 proxy.connect.loop(Nat.mul(3n, 65536n), TunnelRead{s, ""}, ms, sni, cert)
3453
3454def proxy.connect(s: Socket, +ms: U32, sni: String, authority: String,
3455 authorization: String, cert: Maybe<&2, Cert>) ->
3456 IO(Result<&1, &1, Err, Conn>):
3457 do IO<Result<&1, &1, Err, Conn>>:
3458 sent : Socket & Result<&1, &1, U32 & String, Unit> <-
3459 io.send.bytes(False{}, s, Bytes.from_string(proxy.connect.header(authority, authorization)))
3460 proxy.connect.sent(sent, ms, sni, cert)
3461
3462def proxy.route.tls(tls: Bool, s: Socket, +ms: U32, sni: String,
3463 authority: String, authorization: String, cert: Maybe<&2, Cert>) ->
3464 IO(Result<&1, &1, Err, Conn>):
3465 match tls:
3466 case False{}:
3467 IO.pure(Result<&1, &1, Err, Conn>, Done{Conn{False{}, s}})
3468 case True{}:
3469 proxy.connect(s, ms, sni, authority, authorization, cert)
3470
3471def proxy.route.connected(tls: Bool, +ms: U32, sni: String, authority: String,
3472 authorization: String, cert: Maybe<&2, Cert>,
3473 r: Result<&1, &1, Err, Conn>) -> IO(Result<&1, &1, Err, Conn>):
3474 match r:
3475 case Fail{e}:
3476 IO.pure(Result<&1, &1, Err, Conn>, Fail{e})
3477 case Done{c}:
3478 match c:
3479 case Conn{plain, s}:
3480 proxy.route.tls(tls, s, ms, sni, authority, authorization, cert)
3481 case ConnH2{s, client}:
3482 do IO<Result<&1, &1, Err, Conn>>:
3483 Wire.tls.close(s)
3484 return Fail{ErrBad{}}
3485
3486def proxy.route.open(+ms: U32, +tls: Bool, +host: String, +port: U32,
3487 +sni: String, +authority: String, +authorization: String,
3488 cert: Maybe<&2, Cert>) -> IO(Result<&1, &1, Err, Conn>):
3489 do IO<Result<&1, &1, Err, Conn>>:
3490 ips : List<&2, String> <- Dns.resolve.all(host)
3491 conn : Result<&1, &1, Err, Conn> <-
3492 conn.open.all(False{}, ms, host, port, ips, None{}, False{})
3493 proxy.route.connected(tls, ms, sni, authority, authorization, cert, conn)
3494
3495def route.open(+ms: U32, route: Route) -> IO(Result<&1, &1, Err, Conn>):
3496 match route:
3497 case RouteDirect{tls, +host, port, cert}:
3498 do IO<Result<&1, &1, Err, Conn>>:
3499 ips : List<&2, String> <- Dns.resolve.all(host)
3500 conn.open.all(tls, ms, host, port, ips, cert, True{})
3501 case RouteProxy{tls, host, port, sni, authority, authorization, cert}:
3502 proxy.route.open(ms, tls, host, port, sni, authority, authorization, cert)
3503
3504def conn.ex.h1(+tls: Bool, s: Socket, +ms: U32, request: Send) -> IO(Out):
3505 Send{+method, target, authority, headers, body} = request
3506 exchange.go(tls, ms, False{}, String.eq(method, "HEAD"), s,
3507 encode_req.on(method, target, authority, headers, body, False{}))
3508
3509# A socket with bytes past the response is out of step with the server, so it is closed.
3510def pool.keep.s(p: Pool, +key: String, +tls: Bool, res: Res, s: Socket, clean: Bool) -> IO(Pool & Result<&1, &1, Err, Res>):
3511 match clean:
3512 case True{}:
3513 do IO<Pool & Result<&1, &1, Err, Res>>:
3514 p2 : Pool <- pool.give(p, key, Conn{tls, s})
3515 return (p2, Done{res})
3516 case False{}:
3517 do IO<Pool & Result<&1, &1, Err, Res>>:
3518 io.close(tls, s)
3519 return (p, Done{res})
3520
3521def pool.keep.m(p: Pool, +key: String, +tls: Bool, res: Res, +clean: Bool, sock: Maybe<&1, Socket>) -> IO(Pool & Result<&1, &1, Err, Res>):
3522 match sock:
3523 case None{}:
3524 IO.pure(Pool & Result<&1, &1, Err, Res>, (p, Done{res}))
3525 case Some{s}:
3526 pool.keep.s(p, key, tls, res, s, clean)
3527
3528def pool.keep(p: Pool, +key: String, +tls: Bool, res: Res, sock: Maybe<&1, Socket>, rest: Bytes.Bytes) -> IO(Pool & Result<&1, &1, Err, Res>):
3529 Bytes.Bytes{+len, buf} = rest
3530 pool.keep.m(p, key, tls, res, U32.is_zero(len), sock)
3531
3532def pool.after(p: Pool, +key: String, +tls: Bool, o: Out) -> IO(Pool & Result<&1, &1, Err, Res>):
3533 match o:
3534 case OutFail{e, none}:
3535 IO.pure(Pool & Result<&1, &1, Err, Res>, (p, Fail{e}))
3536 case OutDone{res, sock, rest}:
3537 pool.keep(p, key, tls, res, sock, rest)
3538
3539def pool.h2.reusable(c: Conn) -> Bool & Conn:
3540 match c:
3541 case Conn{tls, s}:
3542 (True{}, Conn{tls, s})
3543 case ConnH2{s, H2.Client{input, streams, encoder, decoder, +control}}:
3544 H2.Control{next, active, frame_max, initial, max_streams, send_window,
3545 recv_window, first, ack, continuation, +goaway} = control
3546 (Maybe.is_none(&2, U32, goaway),
3547 ConnH2{s, H2.Client{input, streams, encoder, decoder, control}})
3548
3549def pool.h2.keep(p: Pool, +key: String, res: Res, state: Bool & Conn) ->
3550 IO(Pool & Result<&1, &1, Err, Res>):
3551 (reusable, c) = state
3552 match reusable:
3553 case True{}:
3554 do IO<Pool & Result<&1, &1, Err, Res>>:
3555 next : Pool <- pool.give(p, key, c)
3556 return (next, Done{res})
3557 case False{}:
3558 do IO<Pool & Result<&1, &1, Err, Res>>:
3559 conn.close(c)
3560 return (p, Done{res})
3561
3562def pool.h2.result(p: Pool, +key: String, r: Result<&1, &1, Err, Conn & Res>) ->
3563 IO(Pool & Result<&1, &1, Err, Res>):
3564 match r:
3565 case Fail{e}:
3566 IO.pure(Pool & Result<&1, &1, Err, Res>, (p, Fail{e}))
3567 case Done{(c, res)}:
3568 pool.h2.keep(p, key, res, pool.h2.reusable(c))
3569
3570def pool.h2.ex(p: Pool, +key: String, +ms: U32, request: Send,
3571 s: Socket, client: H2.Client) -> IO(Pool & Result<&1, &1, Err, Res>):
3572 do IO<Pool & Result<&1, &1, Err, Res>>:
3573 r : Result<&1, &1, Err, Conn & Res> <- h2.exchange(s, client, ms, request)
3574 pool.h2.result(p, key, r)
3575
3576def pool.fresh.conn(p: Pool, +key: String, +ms: U32, request: Send,
3577 r: Result<&1, &1, Err, Conn>) -> IO(Pool & Result<&1, &1, Err, Res>):
3578 match r:
3579 case Fail{e}:
3580 IO.pure(Pool & Result<&1, &1, Err, Res>, (p, Fail{e}))
3581 case Done{c}:
3582 match c:
3583 case Conn{+tls, s}:
3584 do IO<Pool & Result<&1, &1, Err, Res>>:
3585 o : Out <- conn.ex.h1(tls, s, ms, request)
3586 pool.after(p, key, tls, o)
3587 case ConnH2{s, client}:
3588 pool.h2.ex(p, key, ms, request, s, client)
3589
3590def pool.fresh(p: Pool, +key: String, +ms: U32, request: Send, route: Route) ->
3591 IO(Pool & Result<&1, &1, Err, Res>):
3592 do IO<Pool & Result<&1, &1, Err, Res>>:
3593 c : Result<&1, &1, Err, Conn> <- route.open(ms, route)
3594 pool.fresh.conn(p, key, ms, request, c)
3595
3596# A reused socket the server already closed fails before any response byte.
3597def pool.retry(+none: Bool, +idem: Bool) -> Bool:
3598 Bool.and(none, idem)
3599
3600def pool.stale(p: Pool, +key: String, +ms: U32, request: Send,
3601 e: Err, again: Bool, route: Route) ->
3602 IO(Pool & Result<&1, &1, Err, Res>):
3603 match again:
3604 case True{}:
3605 pool.fresh(p, key, ms, request, route)
3606 case False{}:
3607 IO.pure(Pool & Result<&1, &1, Err, Res>, (p, Fail{e}))
3608
3609def pool.reused(p: Pool, +key: String, +tls: Bool, +ms: U32, +idem: Bool,
3610 spare: Send, o: Out, route: Route) ->
3611 IO(Pool & Result<&1, &1, Err, Res>):
3612 match o:
3613 case OutFail{e, +none}:
3614 pool.stale(p, key, ms, spare, e, pool.retry(none, idem), route)
3615 case OutDone{res, sock, rest}:
3616 pool.keep(p, key, tls, res, sock, rest)
3617
3618# Copy only the reused HTTP/1.1 request body, for a stale-socket retry.
3619def pool.idle.h1.bodies(p: Pool, +key: String, +tls: Bool, +ms: U32, +idem: Bool,
3620 s: Socket, +method: String, +target: String, +authority: String,
3621 +headers: Map<&2, List<&2, String>>, r: Bytes.Bytes & Bytes.Bytes,
3622 route: Route) -> IO(Pool & Result<&1, &1, Err, Res>):
3623 (wire, spare) = r
3624 do IO<Pool & Result<&1, &1, Err, Res>>:
3625 o : Out <- conn.ex.h1(tls, s, ms, Send{method, target, authority, headers, wire})
3626 pool.reused(p, key, tls, ms, idem,
3627 Send{method, target, authority, headers, spare}, o, route)
3628
3629def pool.idle.h1(p: Pool, +key: String, +tls: Bool, +ms: U32, +idem: Bool,
3630 s: Socket, request: Send, route: Route) ->
3631 IO(Pool & Result<&1, &1, Err, Res>):
3632 Send{+method, +target, +authority, +headers, body} = request
3633 pool.idle.h1.bodies(p, key, tls, ms, idem, s, method, target,
3634 authority, headers, Bytes.slice(body, 0, 4294967295), route)
3635
3636def pool.idle.reuse(p: Pool, +key: String, +ms: U32, +idem: Bool,
3637 c: Conn, request: Send, route: Route) ->
3638 IO(Pool & Result<&1, &1, Err, Res>):
3639 match c:
3640 case Conn{tls, s}:
3641 pool.idle.h1(p, key, tls, ms, idem, s, request, route)
3642 case ConnH2{s, client}:
3643 pool.h2.ex(p, key, ms, request, s, client)
3644
3645def pool.idle(taken: Pool & Maybe<&1, Conn>, +key: String, +ms: U32,
3646 +idem: Bool, request: Send, route: Route) ->
3647 IO(Pool & Result<&1, &1, Err, Res>):
3648 (p, m) = taken
3649 match m:
3650 case None{}:
3651 pool.fresh(p, key, ms, request, route)
3652 case Some{c}:
3653 pool.idle.reuse(p, key, ms, idem, c, request, route)
3654
3655def proxy.http.headers(headers: Map<&2, List<&2, String>>,
3656 authorization: String) -> Map<&2, List<&2, String>>:
3657 match authorization:
3658 case SNil{}:
3659 headers
3660 case other:
3661 set(headers, "proxy-authorization", authorization)
3662
3663def proxy.absolute(scheme: String, host_field: String, target: String) -> String:
3664 scheme ++ "://" ++ host_field ++ target
3665
3666def proxy.request(secure: Bool, +scheme: String, method: String,
3667 +target: String, +hf: String, headers: Map<&2, List<&2, String>>,
3668 body: Bytes.Bytes, authorization: String) -> Send:
3669 match secure:
3670 case True{}:
3671 Send{method, target, hf, Map.del(&2, List<&2, String>, headers,
3672 "proxy-authorization"), body}
3673 case False{}:
3674 Send{method, proxy.absolute(scheme, hf, target), hf,
3675 proxy.http.headers(headers, authorization), body}
3676
3677def pool.origin.proxy(p: Pool, +method: String, +ms: U32,
3678 headers: Map<&2, List<&2, String>>, body: Bytes.Bytes, +hf: String,
3679 +scheme: String, +host: String, +port: U32, +target: String,
3680 +cert: Maybe<&2, Cert>, proxy: Proxy) ->
3681 IO(Pool & Result<&1, &1, Err, Res>):
3682 match proxy:
3683 case ProxyDirect{}:
3684 +key = pool.key.cert(pool.key(scheme, host, port), cert)
3685 pool.idle(pool.take(p, key), key, ms, pool.idempotent(method),
3686 Send{method, target, hf, headers, body},
3687 RouteDirect{String.eq(scheme, "https"), host, port, cert})
3688 case ProxyVia{+proxy_host, +proxy_port, +authorization}:
3689 +secure = String.eq(scheme, "https")
3690 +key = pool.key.cert(pool.key(scheme, host, port)
3691 ++ "|proxy:" ++ proxy_host ++ ":" ++ U32.show(proxy_port)
3692 ++ "|auth:" ++ authorization, cert)
3693 pool.idle(pool.take(p, key), key, ms, pool.idempotent(method),
3694 proxy.request(secure, scheme, method, target, hf, headers, body, authorization),
3695 RouteProxy{secure, proxy_host, proxy_port, host,
3696 Url.host_field.wrap(host, Url.has(host, 58)) ++ ":" ++ U32.show(port),
3697 authorization, cert})
3698
3699def pool.origin.choice(p: Pool, method: String, ms: U32,
3700 headers: Map<&2, List<&2, String>>, body: Bytes.Bytes, hf: String,
3701 scheme: String, host: String, port: U32, target: String,
3702 cert: Maybe<&2, Cert>, choice: Maybe<&2, Proxy>) ->
3703 IO(Pool & Result<&1, &1, Err, Res>):
3704 match choice:
3705 case None{}:
3706 IO.pure(Pool & Result<&1, &1, Err, Res>, (p, Fail{ErrUrl{}}))
3707 case Some{proxy}:
3708 pool.origin.proxy(p, method, ms, headers, body, hf, scheme, host, port,
3709 target, cert, proxy)
3710
3711def pool.origin(p: Pool, method: String, ms: U32,
3712 headers: Map<&2, List<&2, String>>, body: Bytes.Bytes, hf: String,
3713 a: Url.Abs, known: Bool, cert: Maybe<&2, Cert>,
3714 choice: Maybe<&2, Proxy>) ->
3715 IO(Pool & Result<&1, &1, Err, Res>):
3716 Url.Abs{scheme, host, port, target} = a
3717 match known:
3718 case False{}:
3719 IO.pure(Pool & Result<&1, &1, Err, Res>, (p, Fail{ErrUrl{}}))
3720 case True{}:
3721 pool.origin.choice(p, method, ms, headers, body, hf, scheme, host,
3722 port, target, cert, choice)
3723
3724def pool.scheme.ok(a: Url.Abs) -> Bool:
3725 Url.Abs{+scheme, host, port, target} = a
3726 Bool.or(String.eq(scheme, "http"), String.eq(scheme, "https"))
3727
3728def pool.one.back(h: Hop, pr: Pool & Result<&1, &1, Err, Res>) -> Pool & Result<&1, &1, Err, Res> & Hop:
3729 (p, r) = pr
3730 (p, r, h)
3731
3732# sent is headers plus any jar cookies; the hop keeps headers, so cookies never pile up across hops.
3733def pool.one.of(p: Pool, +method: String, +url: Url.Abs,
3734 headers: Map<&2, List<&2, String>>, sent: Map<&2, List<&2, String>>,
3735 +ms: U32, r: Bytes.Bytes & Bytes.Bytes, cert: Maybe<&2, Cert>) ->
3736 IO(Pool & Result<&1, &1, Err, Res> & Hop):
3737 Url.Abs{+scheme, +host, +port, target} = url
3738 (body, wire) = r
3739 do IO<Pool & Result<&1, &1, Err, Res> & Hop>:
3740 choice : Maybe<&2, Proxy> <- proxy.select(scheme, host, port)
3741 pr : Pool & Result<&1, &1, Err, Res> <-
3742 pool.origin(p, method, ms, sent, wire, Url.host_field(url),
3743 url, pool.scheme.ok(url), cert, choice)
3744 return pool.one.back(Hop{method, url, headers, body}, pr)
3745
3746# One request, on an idle socket to its origin when the pool has one. The hop comes back for the redirect.
3747def pool.one(p: Pool, h: Hop, +ms: U32, cert: Maybe<&2, Cert>, jar: Maybe<&2, Jar>) -> IO(Pool & Result<&1, &1, Err, Res> & Hop):
3748 Hop{+method, +url, +headers, body} = h
3749 pool.one.of(p, method, url, headers, jar.opt.apply(jar, url, headers), ms, Bytes.slice(body, 0, 4294967295), cert)
3750
3751type Next is Type:
3752 NDone{res: Result<&1, &1, Err, Res>}
3753 NStop{}
3754 NGo{left: Nat, hop: Hop}
3755
3756type Mode is Data:
3757 ModeFollow{}
3758 ModeManual{}
3759 ModeError{}
3760
3761# left: redirects still allowed after the request we just finished.
3762def fetch.hop(left: Nat, h: Hop) -> Next:
3763 match left:
3764 case 0n:
3765 NStop{}
3766 case 1n+p:
3767 NGo{p, h}
3768
3769def fetch.decide.r(left: Nat, r: Res, next: Maybe<&1, Hop>) -> Next:
3770 match next:
3771 case None{}:
3772 NDone{Done{r}}
3773 case Some{h}:
3774 fetch.hop(left, h)
3775
3776def fetch.decide.res(left: Nat, h: Hop, r: Res) -> Next:
3777 Res{+status, +headers, body} = r
3778 fetch.decide.r(left, Res{status, headers, body}, redirect(status, headers, h))
3779
3780def fetch.decide(left: Nat, h: Hop, m: Result<&1, &1, Err, Res>) -> Next:
3781 match m:
3782 case Fail{e}:
3783 NDone{Fail{e}}
3784 case Done{r}:
3785 fetch.decide.res(left, h, r)
3786
3787def fetch.error.res(r: Res, bad: Bool) -> Next:
3788 match bad:
3789 case True{}:
3790 NDone{Fail{ErrRedirect{}}}
3791 case False{}:
3792 NDone{Done{r}}
3793
3794def fetch.error(h: Hop, m: Result<&1, &1, Err, Res>) -> Next:
3795 match m:
3796 case Fail{e}:
3797 NDone{Fail{e}}
3798 case Done{r}:
3799 Res{+status, +headers, body} = r
3800 fetch.error.res(Res{status, headers, body}, Bool.and(redirect.code(status), has_header(headers, "location")))
3801
3802def fetch.policy(mode: Mode, left: Nat, h: Hop, m: Result<&1, &1, Err, Res>) -> Next:
3803 match mode:
3804 case ModeFollow{}:
3805 fetch.decide(left, h, m)
3806 case ModeManual{}:
3807 NDone{m}
3808 case ModeError{}:
3809 fetch.error(h, m)
3810
3811# A caller's own Accept-Encoding wins; enc is the codings fetch can undo.
3812def accept.enc(+h: Map<&2, List<&2, String>>, +enc: String) -> Map<&2, List<&2, String>>:
3813 Bool.pick(Map<&2, List<&2, String>>, has_header(h, "accept-encoding"), h, set(h, "accept-encoding", enc))
3814
3815def fetch.start(method: String, headers: Map<&2, List<&2, String>>, body: Bytes.Bytes, u: Maybe<&2, Url.Abs>, +enc: String) -> Next:
3816 match u:
3817 case None{}:
3818 NDone{Fail{ErrUrl{}}}
3819 case Some{a}:
3820 NGo{20n, Hop{method, a, accept.enc(req.put(Map.to_list(&2, List<&2, String>, headers), empty()), enc), body}}
3821
3822# The redirect loop's state: the pool, what to do next, the client identity, and the jar if any.
3823type Hops is Type:
3824 Hops{p: Pool, next: Next, cert: Maybe<&2, Cert>, jar: Maybe<&2, Jar>}
3825
3826def pool.next.move(p: Pool, +old: String, cert: Maybe<&2, Cert>, jar: Maybe<&2, Jar>, n: Next) -> Hops:
3827 match n:
3828 case NGo{left, h}:
3829 Hop{method, +url, headers, body} = h
3830 Hops{p, NGo{left, Hop{method, url, headers, body}},
3831 Bool.pick(Maybe<&2, Cert>, String.eq(old, redirect.origin(url)), cert, None{}), jar}
3832 case NDone{r}:
3833 Hops{p, NDone{r}, None{}, jar}
3834 case NStop{}:
3835 Hops{p, NStop{}, None{}, jar}
3836
3837def pool.next.of(+mode: Mode, left: Nat, cert: Maybe<&2, Cert>, p: Pool, +url: Url.Abs, h: Hop, r: Maybe<&2, Jar> & Result<&1, &1, Err, Res>) -> Hops:
3838 (jar, m) = r
3839 pool.next.move(p, redirect.origin(url), cert, jar, fetch.policy(mode, left, h, m))
3840
3841# The jar takes the response's Set-Cookie fields first, redirect or not.
3842def pool.next(+mode: Mode, left: Nat, cert: Maybe<&2, Cert>, jar: Maybe<&2, Jar>, x: Pool & Result<&1, &1, Err, Res> & Hop) -> Hops:
3843 (p, m, h) = x
3844 Hop{method, +url, headers, body} = h
3845 pool.next.of(mode, left, cert, p, url, Hop{method, url, headers, body}, jar.opt.store(jar, url, m))
3846
3847def pool.hops.one(+mode: Mode, +ms: U32, +cert: Maybe<&2, Cert>, +jar: Maybe<&2, Jar>, p: Pool, h: Hop, left: Nat) -> IO(Hops):
3848 do IO<Hops>:
3849 x : Pool & Result<&1, &1, Err, Res> & Hop <- pool.one(p, h, ms, cert, jar)
3850 return pool.next(mode, left, cert, jar, x)
3851
3852# NGo.left is how many redirects may follow this request. 20 is WHATWG's limit.
3853# The jar, when there is one, gives cookies to every hop and takes them from every response.
3854@unsafe
3855def pool.hops(+mode: Mode, +ms: U32, st: Hops) -> IO(Pool & Result<&1, &1, Err, Res> & Maybe<&2, Jar>):
3856 Hops{p, n, cert, cj} = st
3857 match n:
3858 case NDone{m}:
3859 IO.pure(Pool & Result<&1, &1, Err, Res> & Maybe<&2, Jar>, (p, m, cj))
3860 case NStop{}:
3861 IO.pure(Pool & Result<&1, &1, Err, Res> & Maybe<&2, Jar>, (p, Fail{ErrRedirect{}}, cj))
3862 case NGo{+left, h}:
3863 do IO<Pool & Result<&1, &1, Err, Res> & Maybe<&2, Jar>>:
3864 next : Hops <- pool.hops.one(mode, ms, cert, cj, p, h, left)
3865 pool.hops(mode, ms, next)
3866
3867# Content-Encoding (RFC 9110 §8.4): each value, trimmed and lowercased, in the order applied.
3868def ce.keep(+w: String, +rest: List<&2, String>) -> List<&2, String>:
3869 Bool.pick(List<&2, String>, String.is_empty(w), rest, Con{w, rest})
3870
3871def ce.norm(xs: List<&2, String>) -> List<&2, String>:
3872 match xs:
3873 case Nil{}:
3874 Nil{}
3875 case Con{v, t}:
3876 ce.keep(String.to_lower(trim(v)), ce.norm(t))
3877
3878def ce.split(xs: List<&2, String>) -> List<&2, String>:
3879 match xs:
3880 case Nil{}:
3881 Nil{}
3882 case Con{v, t}:
3883 List.append(&2, String, ce.norm(String.split(v, ',')), ce.split(t))
3884
3885# Ok: decoded so far. Bad: a coding failed. Skip: a coding we cannot decode, so the body stays as sent.
3886type Dec is Data:
3887 DecOk{b: String}
3888 DecBad{}
3889 DecSkip{}
3890
3891def ce.of(m: Maybe<&2, String>) -> Dec:
3892 match m:
3893 case None{}:
3894 DecBad{}
3895 case Some{b}:
3896 DecOk{b}
3897
3898# Servers send deflate both with and without the zlib wrapper.
3899def ce.deflate(+b: String, m: Maybe<&2, String>) -> Dec:
3900 match m:
3901 case Some{out}:
3902 DecOk{out}
3903 case None{}:
3904 ce.of(Zlib.inflate(b))
3905
3906def ce.apply(+c: String, +b: String) -> Dec:
3907 Bool.pick(Dec, Bool.or(String.eq(c, "gzip"), String.eq(c, "x-gzip")), ce.of(Zlib.gunzip(b)),
3908 Bool.pick(Dec, String.eq(c, "deflate"), ce.deflate(b, Zlib.unzlib(b)),
3909 Bool.pick(Dec, String.eq(c, "identity"), DecOk{b}, DecSkip{})))
3910
3911def ce.go(cs: List<&2, String>, d: Dec) -> Dec:
3912 match cs:
3913 case Nil{}:
3914 d
3915 case Con{+c, t}:
3916 match d:
3917 case DecOk{+b}:
3918 ce.go(t, ce.apply(c, b))
3919 case DecBad{}:
3920 DecBad{}
3921 case DecSkip{}:
3922 DecSkip{}
3923
3924def decoded.pick(d: Dec, +status: U32, headers: Map<&2, List<&2, String>>, body: String) -> Result<&1, &1, Err, Res>:
3925 match d:
3926 case DecOk{b}:
3927 Done{Res{status, headers, Bytes.from_string(b)}}
3928 case DecBad{}:
3929 Fail{ErrBad{}}
3930 case DecSkip{}:
3931 Done{Res{status, headers, Bytes.from_string(body)}}
3932
3933# ponytail: the codings run on a String copy of the body; give zlib a Bytes input if gzip bodies get big.
3934def decoded.cs(+status: U32, +headers: Map<&2, List<&2, String>>, body: Bytes.Bytes, cs: List<&2, String>) -> Result<&1, &1, Err, Res>:
3935 match cs:
3936 case Nil{}:
3937 Done{Res{status, headers, body}}
3938 case Con{c, t}:
3939 +s = Bytes.to_string(body)
3940 decoded.pick(ce.go(Con{c, t}, DecOk{s}), status, headers, s)
3941
3942def decoded.go(empty: Bool, +status: U32, +headers: Map<&2, List<&2, String>>, body: Bytes.Bytes) -> Result<&1, &1, Err, Res>:
3943 match empty:
3944 case True{}:
3945 Done{Res{status, headers, body}}
3946 case False{}:
3947 decoded.cs(status, headers, body, List.reverse(&2, String, ce.split(fields(headers, "content-encoding"))))
3948
3949# The body decoded per Content-Encoding; the headers stay as sent. A corrupt body is ErrBad.
3950def decoded(res: Res) -> Result<&1, &1, Err, Res>:
3951 Res{+status, +headers, body} = res
3952 Bytes.Bytes{+len, buf} = body
3953 decoded.go(U32.is_zero(len), status, headers, Bytes.Bytes{len, buf})
3954
3955def decoded.m(r: Result<&1, &1, Err, Res>) -> Maybe<&1, Res>:
3956 match r:
3957 case Done{x}:
3958 Some{x}
3959 case Fail{e}:
3960 None{}
3961
3962def decoded.some(res: Res) -> Maybe<&1, Res>:
3963 decoded.m(decoded(res))
3964
3965def ce.words(r: Result<&1, &1, U32 & String, U32 & Array<U32>>) -> Maybe<&1, Bytes.Bytes>:
3966 match r:
3967 case Fail{e}:
3968 None{}
3969 case Done{(+len, buf)}:
3970 Some{Bytes.Bytes{len, buf}}
3971
3972# A decoded body stops at 16 MiB, like a received one.
3973def ce.eff(~eff: U32 -> U32 -> Array<U32> -> IO(Result<&1, &1, U32 & String, U32 & Array<U32>>), b: Bytes.Bytes) -> IO(Maybe<&1, Bytes.Bytes>):
3974 Bytes.Bytes{+len, buf} = b
3975 do IO<Maybe<&1, Bytes.Bytes>>:
3976 r : Result<&1, &1, U32 & String, U32 & Array<U32>> <- eff(16777216, len, buf)
3977 return ce.words(r)
3978
3979def ce.dec(d: Dec) -> Maybe<&1, Bytes.Bytes>:
3980 match d:
3981 case DecOk{b}:
3982 Some{Bytes.from_string(b)}
3983 case DecBad{}:
3984 None{}
3985 case DecSkip{}:
3986 None{}
3987
3988# ponytail: deflate runs on the pure decoder, which also takes raw DEFLATE; servers rarely send it.
3989def ce.io.deflate(on: Bool, b: Bytes.Bytes) -> IO(Maybe<&1, Bytes.Bytes>):
3990 match on:
3991 case True{}:
3992 +s = Bytes.to_string(b)
3993 IO.pure(Maybe<&1, Bytes.Bytes>, ce.dec(ce.deflate(s, Zlib.unzlib(s))))
3994 case False{}:
3995 IO.pure(Maybe<&1, Bytes.Bytes>, Some{b})
3996
3997def ce.io.zstd(on: Bool, +c: String, b: Bytes.Bytes) -> IO(Maybe<&1, Bytes.Bytes>):
3998 match on:
3999 case True{}:
4000 ce.eff(~Zlib.zstd.words, b)
4001 case False{}:
4002 ce.io.deflate(String.eq(c, "deflate"), b)
4003
4004def ce.io.br(on: Bool, +c: String, b: Bytes.Bytes) -> IO(Maybe<&1, Bytes.Bytes>):
4005 match on:
4006 case True{}:
4007 ce.eff(~Zlib.brotli.words, b)
4008 case False{}:
4009 ce.io.zstd(String.eq(c, "zstd"), c, b)
4010
4011# One known coding undone: gzip, x-gzip, br, zstd, deflate, or identity.
4012def ce.io.gz(on: Bool, +c: String, b: Bytes.Bytes) -> IO(Maybe<&1, Bytes.Bytes>):
4013 match on:
4014 case True{}:
4015 ce.eff(~Zlib.inflate.words, b)
4016 case False{}:
4017 ce.io.br(String.eq(c, "br"), c, b)
4018
4019def ce.io.go(cs: List<&2, String>, m: Maybe<&1, Bytes.Bytes>) -> IO(Maybe<&1, Bytes.Bytes>):
4020 match cs:
4021 case Nil{}:
4022 match m:
4023 case None{}:
4024 IO.pure(Maybe<&1, Bytes.Bytes>, None{})
4025 case Some{b}:
4026 IO.pure(Maybe<&1, Bytes.Bytes>, Some{b})
4027 case Con{+c, t}:
4028 match m:
4029 case None{}:
4030 IO.pure(Maybe<&1, Bytes.Bytes>, None{})
4031 case Some{b}:
4032 do IO<Maybe<&1, Bytes.Bytes>>:
4033 n : Maybe<&1, Bytes.Bytes> <- ce.io.gz(Bool.or(String.eq(c, "gzip"), String.eq(c, "x-gzip")), c, b)
4034 ce.io.go(t, n)
4035
4036def ce.has(xs: List<&2, String>, +c: String) -> Bool:
4037 match xs:
4038 case Nil{}:
4039 False{}
4040 case Con{x, t}:
4041 Bool.or(String.eq(c, x), ce.has(t, c))
4042
4043def ce.known(cs: List<&2, String>, +ok: List<&2, String>) -> Bool:
4044 match cs:
4045 case Nil{}:
4046 True{}
4047 case Con{c, t}:
4048 Bool.and(ce.has(ok, c), ce.known(t, ok))
4049
4050def decoded.io.pick(m: Maybe<&1, Bytes.Bytes>, +status: U32, headers: Map<&2, List<&2, String>>) -> Result<&1, &1, Err, Res>:
4051 match m:
4052 case Some{b}:
4053 Done{Res{status, headers, b}}
4054 case None{}:
4055 Fail{ErrBad{}}
4056
4057def decoded.io.run(known: Bool, +status: U32, +headers: Map<&2, List<&2, String>>, body: Bytes.Bytes, cs: List<&2, String>) -> IO(Result<&1, &1, Err, Res>):
4058 match known:
4059 case True{}:
4060 do IO<Result<&1, &1, Err, Res>>:
4061 m : Maybe<&1, Bytes.Bytes> <- ce.io.go(cs, Some{body})
4062 return decoded.io.pick(m, status, headers)
4063 case False{}:
4064 IO.pure(Result<&1, &1, Err, Res>, Done{Res{status, headers, body}})
4065
4066def decoded.io.go(empty: Bool, +enc: String, +status: U32, +headers: Map<&2, List<&2, String>>, body: Bytes.Bytes) -> IO(Result<&1, &1, Err, Res>):
4067 match empty:
4068 case True{}:
4069 IO.pure(Result<&1, &1, Err, Res>, Done{Res{status, headers, body}})
4070 case False{}:
4071 +cs = List.reverse(&2, String, ce.split(fields(headers, "content-encoding")))
4072 decoded.io.run(ce.known(cs, Con{"identity", Con{"x-gzip", ce.split(Con{enc, Nil{}})}}), status, headers, body, cs)
4073
4074# decoded through the C libraries, for the codings in enc. A body with any other coding stays as sent.
4075def decoded.io(+enc: String, res: Res) -> IO(Result<&1, &1, Err, Res>):
4076 Res{+status, +headers, body} = res
4077 Bytes.Bytes{+len, buf} = body
4078 decoded.io.go(U32.is_zero(len), enc, status, headers, Bytes.Bytes{len, buf})
4079
4080# An effect on empty input fails with ENOENT only when its library does not load.
4081def codings.ok(r: Result<&1, &1, U32 & String, U32 & Array<U32>>) -> Bool:
4082 match r:
4083 case Fail{(+c, why)}:
4084 Bool.not(U32.is_eq(c, 2))
4085 case Done{p}:
4086 True{}
4087
4088def codings.has(~eff: U32 -> U32 -> Array<U32> -> IO(Result<&1, &1, U32 & String, U32 & Array<U32>>), b: Bytes.Bytes) -> IO(Bool):
4089 Bytes.Bytes{+len, buf} = b
4090 do IO<Bool>:
4091 r : Result<&1, &1, U32 & String, U32 & Array<U32>> <- eff(0, len, buf)
4092 return codings.ok(r)
4093
4094def codings.add(has: Bool, +enc: String, +c: String) -> String:
4095 Bool.pick(String, has, enc ++ ", " ++ c, enc)
4096
4097# gzip and deflate, then br and zstd when their C library loads.
4098def codings() -> IO(String):
4099 do IO<String>:
4100 b : Bool <- codings.has(~Zlib.brotli.words, Bytes.new(0))
4101 z : Bool <- codings.has(~Zlib.zstd.words, Bytes.new(0))
4102 return codings.add(z, codings.add(b, "gzip, deflate", "br"), "zstd")
4103
4104# The final response of a fetch, after redirects.
4105def fetch.final(+enc: String, r: Result<&1, &1, Err, Res>) -> IO(Result<&1, &1, Err, Res>):
4106 match r:
4107 case Done{res}:
4108 decoded.io(enc, res)
4109 case Fail{e}:
4110 IO.pure(Result<&1, &1, Err, Res>, Fail{e})
4111
4112def pool.final(+enc: String, pr: Pool & Result<&1, &1, Err, Res> & Maybe<&2, Jar>) -> IO(Pool & Result<&1, &1, Err, Res>):
4113 (p, r, jar) = pr
4114 do IO<Pool & Result<&1, &1, Err, Res>>:
4115 d : Result<&1, &1, Err, Res> <- fetch.final(enc, r)
4116 return (p, d)
4117
4118def pool.how.enc(+enc: String, p: Pool, method: String, url: String, headers: Map<&2, List<&2, String>>, body: Bytes.Bytes, ms: U32, mode: Mode, cert: Maybe<&2, Cert>) -> IO(Pool & Result<&1, &1, Err, Res>):
4119 do IO<Pool & Result<&1, &1, Err, Res>>:
4120 pr : Pool & Result<&1, &1, Err, Res> & Maybe<&2, Jar> <- pool.hops(mode, ms, Hops{p, fetch.start(method, headers, body, Url.absolute(url), enc), cert, None{}})
4121 pool.final(enc, pr)
4122
4123def pool.how.cert(p: Pool, method: String, url: String, headers: Map<&2, List<&2, String>>, body: Bytes.Bytes, ms: U32, mode: Mode, cert: Maybe<&2, Cert>) -> IO(Pool & Result<&1, &1, Err, Res>):
4124 do IO<Pool & Result<&1, &1, Err, Res>>:
4125 enc : String <- codings()
4126 pool.how.enc(enc, p, method, url, headers, body, ms, mode, cert)
4127
4128# pool.how(p, "GET", "https://example.com/x?y=1", headers, body, ms, mode) follows redirects
4129# on p's idle sockets. Fail is a bad URL, a failed lookup, connect, handshake, send, read,
4130# a malformed response, more than 20 redirects, or a step past ms. Bodies are bytes.
4131def pool.how(p: Pool, method: String, url: String, headers: Map<&2, List<&2, String>>, body: Bytes.Bytes, ms: U32, mode: Mode) -> IO(Pool & Result<&1, &1, Err, Res>):
4132 pool.how.cert(p, method, url, headers, body, ms, mode, None{})
4133
4134def pool.fetch.with(p: Pool, method: String, url: String, headers: Map<&2, List<&2, String>>, body: Bytes.Bytes, ms: U32) -> IO(Pool & Result<&1, &1, Err, Res>):
4135 pool.how(p, method, url, headers, body, ms, ModeFollow{})
4136
4137def pool.fetch(p: Pool, method: String, url: String, headers: Map<&2, List<&2, String>>, body: Bytes.Bytes) -> IO(Pool & Result<&1, &1, Err, Res>):
4138 pool.fetch.with(p, method, url, headers, body, 30000)
4139
4140def pool.fetch.cert.with(p: Pool, method: String, url: String, headers: Map<&2, List<&2, String>>, body: Bytes.Bytes, chain: String, key: String, ms: U32) -> IO(Pool & Result<&1, &1, Err, Res>):
4141 pool.how.cert(p, method, url, headers, body, ms, ModeFollow{}, Some{Cert{chain, key}})
4142
4143def pool.fetch.cert(p: Pool, method: String, url: String, headers: Map<&2, List<&2, String>>, body: Bytes.Bytes, chain: String, key: String) -> IO(Pool & Result<&1, &1, Err, Res>):
4144 pool.fetch.cert.with(p, method, url, headers, body, chain, key, 30000)
4145
4146# One request for fetch.all: the arguments of fetch, as a record.
4147type Fetch is Type:
4148 Fetch{method: String, url: String, headers: Map<&2, List<&2, String>>, body: Bytes.Bytes}
4149
4150def fetch.all.job(p: Pool, f: Fetch) -> IO(Pool & Result<&1, &1, Err, Res>):
4151 Fetch{method, url, headers, body} = f
4152 pool.fetch(p, method, url, headers, body)
4153
4154def fetch.all.pools(n: Nat) -> List<Pool>:
4155 match n:
4156 case 0n:
4157 Nil{}
4158 case 1n+p:
4159 pool.new() <> fetch.all.pools(p)
4160
4161def fetch.all.close(ps: List<Pool>) -> IO(Unit):
4162 match ps:
4163 case Nil{}:
4164 IO.pure(Unit, Unit{})
4165 case p <> rest:
4166 do IO<Unit>:
4167 pool.close(p)
4168 fetch.all.close(rest)
4169
4170def fetch.all.done(r: List<Pool> & List<Result<&1, &1, Err, Res>>) -> IO(List<Result<&1, &1, Err, Res>>):
4171 (ps, rs) = r
4172 do IO<List<Result<&1, &1, Err, Res>>>:
4173 fetch.all.close(ps)
4174 return rs
4175
4176# No requests start no workers, since Conc.pool needs at least one.
4177def fetch.all.go(xs: List<Fetch>, +workers: Nat) -> IO(List<Result<&1, &1, Err, Res>>):
4178 match xs:
4179 case Nil{}:
4180 IO.pure(List<Result<&1, &1, Err, Res>>, Nil{})
4181 case x <> rest:
4182 do IO<List<Result<&1, &1, Err, Res>>>:
4183 r : List<Pool> & List<Result<&1, &1, Err, Res>> <-
4184 Conc.pool(~Pool, ~Fetch, ~Result<&1, &1, Err, Res>, ~fetch.all.job, fetch.all.pools(workers), x <> rest)
4185 fetch.all.done(r)
4186
4187def fetch.all.of(+n: U32, nx: Nat & List<Fetch>) -> IO(List<Result<&1, &1, Err, Res>>):
4188 (+len, xs) = nx
4189 fetch.all.go(xs, Nat.min(len, Nat.max(1n, U32.to_nat(n))))
4190
4191# Each request as fetch would make it, on at most n workers (0 counts as 1, and
4192# never more workers than requests). Each worker owns its own Pool, so an idle
4193# socket is reused only by the worker that opened it; every pool is closed at the
4194# end. Results come back in the order of reqs.
4195def fetch.all(reqs: List<Fetch>, +n: U32) -> IO(List<Result<&1, &1, Err, Res>>):
4196 fetch.all.of(n, Conc.count(Fetch, reqs))
4197
4198# The hops always hand the jar back; j is only the type's fallback.
4199def pool.jar.final(+enc: String, j: Jar, pr: Pool & Result<&1, &1, Err, Res> & Maybe<&2, Jar>) -> IO(Pool & Jar & Result<&1, &1, Err, Res>):
4200 (p, r, jar) = pr
4201 do IO<Pool & Jar & Result<&1, &1, Err, Res>>:
4202 d : Result<&1, &1, Err, Res> <- fetch.final(enc, r)
4203 return (p, Maybe.default(&2, Jar, jar, j), d)
4204
4205def pool.jar.enc(+enc: String, p: Pool, +j: Jar, method: String, url: String, headers: Map<&2, List<&2, String>>, body: Bytes.Bytes) -> IO(Pool & Jar & Result<&1, &1, Err, Res>):
4206 do IO<Pool & Jar & Result<&1, &1, Err, Res>>:
4207 pr : Pool & Result<&1, &1, Err, Res> & Maybe<&2, Jar> <- pool.hops(ModeFollow{}, 30000, Hops{p, fetch.start(method, headers, body, Url.absolute(url), enc), None{}, Some{j}})
4208 pool.jar.final(enc, j, pr)
4209
4210# pool.fetch with a cookie jar (RFC 6265bis). Before every hop, redirects included, the jar's
4211# cookies for that URL join the request's cookie field; after every response, redirects included,
4212# its Set-Cookie fields go into the jar. The jar's clock is the caller's: advance it with jar.at.
4213def pool.fetch.jar(p: Pool, j: Jar, method: String, url: String, headers: Map<&2, List<&2, String>>, body: Bytes.Bytes) -> IO(Pool & Jar & Result<&1, &1, Err, Res>):
4214 do IO<Pool & Jar & Result<&1, &1, Err, Res>>:
4215 enc : String <- codings()
4216 pool.jar.enc(enc, p, j, method, url, headers, body)
4217def fetch.end(pr: Pool & Result<&1, &1, Err, Res>) -> IO(Result<&1, &1, Err, Res>):
4218 (p, r) = pr
4219 do IO<Result<&1, &1, Err, Res>>:
4220 pool.close(p)
4221 return r
4222
4223# fetch is pool.how on a fresh pool that closes afterwards.
4224def fetch.how(method: String, url: String, headers: Map<&2, List<&2, String>>, body: Bytes.Bytes, ms: U32, mode: Mode) -> IO(Result<&1, &1, Err, Res>):
4225 do IO<Result<&1, &1, Err, Res>>:
4226 pr : Pool & Result<&1, &1, Err, Res> <- pool.how(pool.new(), method, url, headers, body, ms, mode)
4227 fetch.end(pr)
4228
4229def fetch.with(method: String, url: String, headers: Map<&2, List<&2, String>>, body: Bytes.Bytes, ms: U32) -> IO(Result<&1, &1, Err, Res>):
4230 fetch.how(method, url, headers, body, ms, ModeFollow{})
4231
4232def fetch.cert.with(method: String, url: String, headers: Map<&2, List<&2, String>>, body: Bytes.Bytes, chain: String, key: String, ms: U32) -> IO(Result<&1, &1, Err, Res>):
4233 do IO<Result<&1, &1, Err, Res>>:
4234 pr : Pool & Result<&1, &1, Err, Res> <- pool.fetch.cert.with(pool.new(), method, url, headers, body, chain, key, ms)
4235 fetch.end(pr)
4236
4237def fetch.cert(method: String, url: String, headers: Map<&2, List<&2, String>>, body: Bytes.Bytes, chain: String, key: String) -> IO(Result<&1, &1, Err, Res>):
4238 fetch.cert.with(method, url, headers, body, chain, key, 30000)
4239
4240# fetch.with and a 30 s step timeout.
4241def fetch(method: String, url: String, headers: Map<&2, List<&2, String>>, body: Bytes.Bytes) -> IO(Result<&1, &1, Err, Res>):
4242 fetch.with(method, url, headers, body, 30000)
4243
4244def get(url: String) -> IO(Result<&1, &1, Err, Res>):
4245 fetch("GET", url, empty(), Bytes.new(0))
4246
4247# POST v as compact JSON, with content-type: application/json.
4248def post.json(url: String, v: Json.Val) -> IO(Result<&1, &1, Err, Res>):
4249 fetch("POST", url, set(empty(), "content-type", "application/json"), Json.encode.bytes(v))
4250
4251# Base URLs: resolve(base, ref) is ref against the absolute http(s) URL base (RFC 3986 §5.2),
4252# written back as a URL for fetch. None when base is not absolute or ref has another scheme.
4253def resolve.show(a: Url.Abs) -> String:
4254 Url.Abs{+scheme, host, port, +target} = a
4255 scheme ++ "://" ++ Url.host_field(Url.Abs{scheme, host, port, target}) ++ target
4256
4257def resolve.to(m: Maybe<&2, Url.Abs>) -> Maybe<&2, String>:
4258 match m:
4259 case None{}:
4260 None{}
4261 case Some{a}:
4262 Some{resolve.show(a)}
4263
4264def resolve.base(m: Maybe<&2, Url.Abs>, +ref: String) -> Maybe<&2, String>:
4265 match m:
4266 case None{}:
4267 None{}
4268 case Some{b}:
4269 resolve.to(Url.resolve(b, ref))
4270
4271def resolve(base: String, +ref: String) -> Maybe<&2, String>:
4272 resolve.base(Url.absolute(base), ref)
4273
4274# Retry. The wait before retry n (0 first) is 500 ms doubled n times, at most 30 s;
4275# its upper half is jitter r: backoff(n, r) = half + r mod (half + 1).
4276def retry.cap() -> U32:
4277 30000
4278
4279def retry.base(n: Nat) -> U32:
4280 match n:
4281 case 0n:
4282 500
4283 case 1n+p:
4284 U32.min((retry.base(p) * 2 : U32), retry.cap())
4285
4286def retry.backoff.half(+half: U32, +r: U32) -> U32:
4287 (half + (r % (half + 1)) : U32)
4288
4289def retry.backoff(n: Nat, +r: U32) -> U32:
4290 retry.backoff.half((retry.base(n) / 2 : U32), r)
4291
4292# ms clamped to 0 .. retry.cap().
4293def retry.after.ms(+ms: Int.I64) -> U32:
4294 Bool.pick(U32, Int.I64.is_neg(ms), 0,
4295 Bool.pick(U32, Int.I64.is_lt(ms, Int.I64.from_u32(retry.cap())), Int.I64.to_u32(ms), retry.cap()))
4296
4297def retry.after.date(m: Maybe<&2, Time.Instant>, now: Time.Instant) -> Maybe<&2, U32>:
4298 match m:
4299 case None{}:
4300 None{}
4301 case Some{date}:
4302 Some{retry.after.ms(Time.Duration.to_ms(Time.Instant.since(date, now)))}
4303
4304# More than 5 digits is past the cap, and would overflow parse_u32.
4305def retry.after.secs(+v: String, now: Time.Instant, n: Maybe<&2, U32>) -> Maybe<&2, U32>:
4306 match n:
4307 case None{}:
4308 retry.after.date(Time.http_date.parse(v), now)
4309 case Some{s}:
4310 Some{Bool.pick(U32, Nat.is_lt(5n, String.length(v)), retry.cap(), U32.min((s * 1000 : U32), retry.cap()))}
4311
4312# Retry-After (RFC 9110 §10.2.3) as ms from now, at most retry.cap(): delay-seconds, or an
4313# HTTP-date (a past date is 0). None when v is empty or neither form.
4314def retry.after(+v: String, now: Time.Instant) -> Maybe<&2, U32>:
4315 retry.after.secs(v, now, parse_u32(v))
4316
4317def retry.wait(m: Maybe<&2, U32>, n: Nat, +r: U32) -> U32:
4318 match m:
4319 case None{}:
4320 retry.backoff(n, r)
4321 case Some{ms}:
4322 ms
4323
4324# The wait before retry n: Retry-After v when it reads as a delay, else backoff with jitter r.
4325def retry.delay(+v: String, now: Time.Instant, n: Nat, +r: U32) -> U32:
4326 retry.wait(retry.after(v, now), n, r)
4327
4328# Statuses a later try may clear.
4329def retry.status(+s: U32) -> Bool:
4330 Bool.or(Bool.or(U32.is_eq(s, 408), U32.is_eq(s, 429)),
4331 Bool.or(Bool.or(U32.is_eq(s, 500), U32.is_eq(s, 502)), Bool.or(U32.is_eq(s, 503), U32.is_eq(s, 504))))
4332
4333# A refused connect or a timeout may clear; any other error would repeat.
4334def retry.fail(e: Err) -> Result<&1, &1, Err, Res> & Maybe<&2, String>:
4335 match e:
4336 case ErrConnect{code, why}:
4337 (Fail{ErrConnect{code, why}}, Some{""})
4338 case ErrTimeout{}:
4339 (Fail{ErrTimeout{}}, Some{""})
4340 case other:
4341 (Fail{other}, None{})
4342
4343def retry.res(res: Res) -> Result<&1, &1, Err, Res> & Maybe<&2, String>:
4344 Res{+status, +headers, body} = res
4345 (Done{Res{status, headers, body}}, Bool.pick(Maybe<&2, String>, retry.status(status), Some{header(headers, "retry-after")}, None{}))
4346
4347def retry.judge.try(r: Result<&1, &1, Err, Res>) -> Result<&1, &1, Err, Res> & Maybe<&2, String>:
4348 match r:
4349 case Fail{e}:
4350 retry.fail(e)
4351 case Done{res}:
4352 retry.res(res)
4353
4354# One try, judged: the result as it came, and Some{Retry-After value} ("" when absent)
4355# when an idempotent request may try again.
4356def retry.judge(idem: Bool, r: Result<&1, &1, Err, Res>) -> Result<&1, &1, Err, Res> & Maybe<&2, String>:
4357 match idem:
4358 case False{}:
4359 (r, None{})
4360 case True{}:
4361 retry.judge.try(r)
4362
4363# ponytail: a failed random source gives jitter 0, so the wait is the lower half.
4364def retry.jitter(r: Result<&1, &1, U32 & String, U32>) -> U32:
4365 match r:
4366 case Fail{e}:
4367 0
4368 case Done{x}:
4369 x
4370
4371def retry.sleep(+v: String, n: Nat) -> IO(Unit):
4372 do IO<Unit>:
4373 now : Time.Instant <- Time.now()
4374 rnd : Result<&1, &1, U32 & String, U32> <- IO.random_u32()
4375 IO.sleep(retry.delay(v, now, n, retry.jitter(rnd)))
4376
4377def retry.kept(body: Bytes.Bytes, j: Result<&1, &1, Err, Res> & Maybe<&2, String>) -> Bytes.Bytes & Result<&1, &1, Err, Res> & Maybe<&2, String>:
4378 (r, m) = j
4379 (body, r, m)
4380
4381# One fetch of the copy; the body comes back for the next try.
4382def retry.one(+idem: Bool, +method: String, +url: String, +headers: Map<&2, List<&2, String>>,
4383 r: Bytes.Bytes & Bytes.Bytes) -> IO(Bytes.Bytes & Result<&1, &1, Err, Res> & Maybe<&2, String>):
4384 (body, spare) = r
4385 do IO<Bytes.Bytes & Result<&1, &1, Err, Res> & Maybe<&2, String>>:
4386 got : Result<&1, &1, Err, Res> <- fetch(method, url, headers, spare)
4387 return retry.kept(body, retry.judge(idem, got))
4388
4389# left: retries still allowed. n: the retry to wait for next, 0 first.
4390def retry.go(left: Nat, +n: Nat, +idem: Bool, +method: String, +url: String,
4391 +headers: Map<&2, List<&2, String>>,
4392 t: Bytes.Bytes & Result<&1, &1, Err, Res> & Maybe<&2, String>) -> IO(Result<&1, &1, Err, Res>):
4393 match left:
4394 case 0n:
4395 (body, r, m) = t
4396 IO.pure(Result<&1, &1, Err, Res>, r)
4397 case 1n+p:
4398 (body, r, m) = t
4399 match m:
4400 case None{}:
4401 IO.pure(Result<&1, &1, Err, Res>, r)
4402 case Some{v}:
4403 do IO<Result<&1, &1, Err, Res>>:
4404 retry.sleep(v, n)
4405 tried : Bytes.Bytes & Result<&1, &1, Err, Res> & Maybe<&2, String> <-
4406 retry.one(idem, method, url, headers, Bytes.slice(body, 0, 4294967295))
4407 retry.go(p, 1n+n, idem, method, url, headers, tried)
4408
4409# fetch.retry(n, method, url, headers, body) is fetch, tried again up to n times while an
4410# idempotent method (GET, HEAD, OPTIONS, TRACE, PUT, DELETE) gets a connect error, a timeout,
4411# or 408, 429, 500, 502, 503, or 504. POST, PATCH and other methods get one try. It waits
4412# Retry-After (seconds or HTTP-date, at most 30 s) when given, else the backoff. When retries
4413# run out, the last response or error comes back as it was.
4414def retry.start(enabled: Bool, n: U32, +method: String, +url: String,
4415 +headers: Map<&2, List<&2, String>>, body: Bytes.Bytes) ->
4416 IO(Result<&1, &1, Err, Res>):
4417 match enabled:
4418 case False{}:
4419 fetch(method, url, headers, body)
4420 case True{}:
4421 do IO<Result<&1, &1, Err, Res>>:
4422 first : Bytes.Bytes & Result<&1, &1, Err, Res> & Maybe<&2, String> <-
4423 retry.one(True{}, method, url, headers, Bytes.slice(body, 0, 4294967295))
4424 retry.go(U32.to_nat(n), 0n, True{}, method, url, headers, first)
4425
4426def fetch.retry(+n: U32, +method: String, +url: String,
4427 +headers: Map<&2, List<&2, String>>, body: Bytes.Bytes) ->
4428 IO(Result<&1, &1, Err, Res>):
4429 retry.start(Bool.and(U32.is_ne(n, 0), pool.idempotent(method)),
4430 n, method, url, headers, body)
4431
4432# Streaming (a body read or sent in pieces). A decoded stream owns its decoders.
4433# What the next read returns: read more, a raw piece, a decoded piece, the end, or an error.
4434type Po is Type:
4435 PoNone{}
4436 PoPiece{b: Bytes.Bytes}
4437 PoReady{b: Bytes.Bytes}
4438 PoEnd{}
4439 PoBad{e: Err}
4440
4441type Stream is Type:
4442 Stream{tls: Bool, s: Socket, ms: U32, res: Res, rb: Rb, out: Po, decs: List<&1, Zlib.Decoder>}
4443
4444type Pc is Type:
4445 Pc{rb: Rb, out: Po}
4446
4447# A body piece, or none when empty: more reads the next piece, and not more is the end.
4448def pc.po(more: Bool, empty: Bool, b: Bytes.Bytes) -> Po:
4449 match empty:
4450 case True{}:
4451 Bool.pick(Po, more, PoNone{}, PoEnd{})
4452 case False{}:
4453 PoPiece{b}
4454
4455def pc.piece(more: Bool, +rb: Rb, b: Bytes.Bytes) -> Pc:
4456 Bytes.Bytes{+len, buf} = b
4457 Pc{rb, pc.po(more, U32.is_zero(len), Bytes.Bytes{len, buf})}
4458
4459def pc.fed.of(b: Bytes.Bytes, st: Rb) -> Pc:
4460 match st:
4461 case RbDone{}:
4462 pc.piece(False{}, RbDone{}, b)
4463 case RbBad{}:
4464 Pc{RbDone{}, PoBad{ErrBad{}}}
4465 case RbLen{n}:
4466 pc.piece(True{}, RbLen{n}, b)
4467 case RbChunk{st}:
4468 pc.piece(True{}, RbChunk{st}, b)
4469 case RbClose{}:
4470 pc.piece(True{}, RbClose{}, b)
4471
4472def pc.fed(bf: Bf) -> Pc:
4473 Bf{st, parts, rest} = bf
4474 pc.fed.of(rb.body(parts), st)
4475
4476# The body bytes that just arrived: what they add to the body, and how it ends.
4477def pc.of(rb: Rb, piece: Bytes.Bytes) -> Pc:
4478 pc.fed(rb.feed(rb, Nil{}, piece))
4479
4480# The server closed. Only a close-delimited body may end this way (RFC 9112 §8).
4481def pc.end(ok: Bool) -> Pc:
4482 match ok:
4483 case True{}:
4484 Pc{RbDone{}, PoEnd{}}
4485 case False{}:
4486 Pc{RbDone{}, PoBad{ErrBad{}}}
4487
4488def pc.eof(st: Rb) -> Pc:
4489 pc.end(rb.eof(st))
4490
4491def stream.mk(+tls: Bool, s: Socket, +ms: U32, res: Res, decs: List<&1, Zlib.Decoder>, pc: Pc) -> Stream:
4492 Pc{rb, out} = pc
4493 Stream{tls, s, ms, res, rb, out, decs}
4494
4495def stream.got.piece(+tls: Bool, s: Socket, +ms: U32, res: Res, decs: List<&1, Zlib.Decoder>, +rb: Rb, p: U32 & Array<U32>) -> Stream:
4496 (+len, buf) = p
4497 stream.mk(tls, s, ms, res, decs, Bool.pick(Pc, U32.is_zero(len), pc.eof(rb), pc.of(rb, Bytes.Bytes{len, buf})))
4498
4499def stream.got(+tls: Bool, +ms: U32, res: Res, decs: List<&1, Zlib.Decoder>, +rb: Rb, m: Socket & Result<&1, &1, U32 & String, U32 & Array<U32>>) -> Stream:
4500 (s, r) = m
4501 match r:
4502 case Fail{(+code, why)}:
4503 Stream{tls, s, ms, res, RbDone{}, PoBad{err.or_late(code, ErrRead{code, why})}, decs}
4504 case Done{p}:
4505 stream.got.piece(tls, s, ms, res, decs, rb, p)
4506
4507def stream.after(+rb: Rb) -> Po:
4508 match rb:
4509 case RbDone{}:
4510 PoEnd{}
4511 case RbBad{}:
4512 PoEnd{}
4513 case RbLen{n}:
4514 PoNone{}
4515 case RbChunk{st}:
4516 PoNone{}
4517 case RbClose{}:
4518 PoNone{}
4519
4520type Fed is Type:
4521 Fed{decs: List<&1, Zlib.Decoder>, body: Result<&1, &1, Err, Bytes.Bytes>}
4522
4523def stream.feed.received(done: List<&1, Zlib.Decoder>, m: Zlib.Decoder & Result<&1, &1, U32 & String, U32 & Array<U32>>) -> Fed:
4524 (d, r) = m
4525 match r:
4526 case Fail{e}:
4527 Fed{d <> done, Fail{ErrBad{}}}
4528 case Done{(+len, buf)}:
4529 Fed{d <> done, Done{Bytes.Bytes{len, buf}}}
4530
4531def stream.feed.step(st: Fed, d: Zlib.Decoder) -> IO(Fed):
4532 Fed{done, body} = st
4533 match body:
4534 case Fail{e}:
4535 IO.pure(Fed, Fed{d <> done, Fail{e}})
4536 case Done{b}:
4537 Bytes.Bytes{+len, buf} = b
4538 do IO<Fed>:
4539 m : Zlib.Decoder & Result<&1, &1, U32 & String, U32 & Array<U32>> <-
4540 Zlib.dec.feed.words(d, 16777216, len, buf)
4541 return stream.feed.received(done, m)
4542
4543def stream.feed.one(prev: IO(Fed), d: Zlib.Decoder) -> IO(Fed):
4544 do IO<Fed>:
4545 st : Fed <- prev
4546 stream.feed.step(st, d)
4547
4548def stream.feed.reverse(st: Fed) -> Fed:
4549 Fed{done, body} = st
4550 Fed{List.reverse(&1, Zlib.Decoder, done), body}
4551
4552def stream.feed.all(decs: List<&1, Zlib.Decoder>, b: Bytes.Bytes) -> IO(Fed):
4553 do IO<Fed>:
4554 st : Fed <- List.foldl(~&1, ~Zlib.Decoder, ~IO(Fed), ~stream.feed.one, decs,
4555 IO.pure(Fed, Fed{Nil{}, Done{b}}))
4556 return stream.feed.reverse(st)
4557
4558def stream.ready(empty: Bool, +rb: Rb, b: Bytes.Bytes) -> Po:
4559 match empty:
4560 case True{}:
4561 stream.after(rb)
4562 case False{}:
4563 PoReady{b}
4564
4565def stream.feed.got(+tls: Bool, s: Socket, +ms: U32, res: Res, +rb: Rb, st: Fed) -> Stream:
4566 Fed{decs, body} = st
4567 match body:
4568 case Fail{e}:
4569 Stream{tls, s, ms, res, rb, PoBad{e}, decs}
4570 case Done{b}:
4571 Bytes.Bytes{+len, buf} = b
4572 Stream{tls, s, ms, res, rb, stream.ready(U32.is_zero(len), rb, Bytes.Bytes{len, buf}), decs}
4573
4574def stream.feed.st(st: Stream, b: Bytes.Bytes) -> IO(Stream):
4575 Stream{+tls, s, +ms, res, +rb, out, decs} = st
4576 match decs:
4577 case Nil{}:
4578 IO.pure(Stream, Stream{tls, s, ms, res, rb, PoReady{b}, Nil{}})
4579 case Con{d, rest}:
4580 do IO<Stream>:
4581 fed : Fed <- stream.feed.all(Con{d, rest}, b)
4582 return stream.feed.got(tls, s, ms, res, rb, fed)
4583
4584def stream.finish.ok(r: Result<&1, &1, U32 & String, Unit>) -> Bool:
4585 match r:
4586 case Fail{e}:
4587 False{}
4588 case Done{u}:
4589 True{}
4590
4591def stream.finish(decs: List<&1, Zlib.Decoder>) -> IO(Bool):
4592 match decs:
4593 case Nil{}:
4594 IO.pure(Bool, True{})
4595 case Con{d, rest}:
4596 do IO<Bool>:
4597 r : Result<&1, &1, U32 & String, Unit> <- Zlib.dec.finish(d)
4598 tail : Bool <- stream.finish(rest)
4599 return Bool.and(stream.finish.ok(r), tail)
4600
4601def stream.ended(good: Bool, +tls: Bool, s: Socket, +ms: U32, res: Res, +rb: Rb) ->
4602 Stream & Result<&1, &1, Err, Maybe<&1, Bytes.Bytes>>:
4603 match good:
4604 case True{}:
4605 (Stream{tls, s, ms, res, rb, PoEnd{}, Nil{}}, Done{None{}})
4606 case False{}:
4607 (Stream{tls, s, ms, res, rb, PoBad{ErrBad{}}, Nil{}}, Fail{ErrBad{}})
4608
4609# The next piece of the body; None at the end. A piece is never empty.
4610@unsafe
4611def stream.read(st: Stream) -> IO(Stream & Result<&1, &1, Err, Maybe<&1, Bytes.Bytes>>):
4612 Stream{+tls, s, +ms, res, +rb, out, decs} = st
4613 match out:
4614 case PoPiece{b}:
4615 do IO<Stream & Result<&1, &1, Err, Maybe<&1, Bytes.Bytes>>>:
4616 next : Stream <- stream.feed.st(Stream{tls, s, ms, res, rb, PoNone{}, decs}, b)
4617 stream.read(next)
4618 case PoReady{b}:
4619 IO.pure(Stream & Result<&1, &1, Err, Maybe<&1, Bytes.Bytes>>,
4620 (Stream{tls, s, ms, res, rb, stream.after(rb), decs}, Done{Some{b}}))
4621 case PoEnd{}:
4622 do IO<Stream & Result<&1, &1, Err, Maybe<&1, Bytes.Bytes>>>:
4623 good : Bool <- stream.finish(decs)
4624 return stream.ended(good, tls, s, ms, res, rb)
4625 case PoBad{+e}:
4626 IO.pure(Stream & Result<&1, &1, Err, Maybe<&1, Bytes.Bytes>>,
4627 (Stream{tls, s, ms, res, rb, PoBad{e}, decs}, Fail{e}))
4628 case PoNone{}:
4629 do IO<Stream & Result<&1, &1, Err, Maybe<&1, Bytes.Bytes>>>:
4630 m : Socket & Result<&1, &1, U32 & String, U32 & Array<U32>> <- io.recv.words(tls, s, 65536, ms)
4631 stream.read(stream.got(tls, ms, res, decs, rb, m))
4632
4633# Status and headers. Its body is empty: read the body with stream.read.
4634def stream.res(st: Stream) -> Stream & Res:
4635 Stream{tls, s, ms, res, rb, out, decs} = st
4636 Res{+status, +headers, body} = res
4637 (Stream{tls, s, ms, Res{status, headers, body}, rb, out, decs}, Res{status, headers, Bytes.new(0)})
4638
4639def stream.close(st: Stream) -> IO(Unit):
4640 Stream{tls, s, ms, res, rb, out, decs} = st
4641 do IO<Unit>:
4642 good : Bool <- stream.finish(decs)
4643 io.close(tls, s)
4644
4645# Head read state: still scanning, cut short or bad, or the head with the bytes after it.
4646type Sh is Type:
4647 ShMore{buf: Bytes.Bytes, k: U32}
4648 ShBad{err: Maybe<&2, Err>}
4649 ShRes{res: Res, rb: Rb, rest: Bytes.Bytes}
4650
4651def sh.of(hs: Hs) -> Sh:
4652 match hs:
4653 case HsWait{buf, k}:
4654 ShMore{buf, k}
4655 case HsBad{}:
4656 ShBad{None{}}
4657 case HsSeek{buf, from, k}:
4658 ShBad{None{}}
4659 case HsRes{res, rb, rest}:
4660 ShRes{res, rb, rest}
4661
4662def sh.piece(+head: Bool, buf: Bytes.Bytes, +k: U32, p: U32 & Array<U32>) -> Sh:
4663 (+len, b) = p
4664 Bool.pick(Sh, U32.is_zero(len), ShBad{None{}}, sh.of(hs.more(head, k, buf, Bytes.Bytes{len, b})))
4665
4666def sh.next(+head: Bool, buf: Bytes.Bytes, +k: U32, m: Socket & Result<&1, &1, U32 & String, U32 & Array<U32>>) -> Socket & Sh:
4667 (s, r) = m
4668 match r:
4669 case Fail{(+code, why)}:
4670 (s, ShBad{Some{err.or_late(code, ErrRead{code, why})}})
4671 case Done{p}:
4672 (s, sh.piece(head, buf, k, p))
4673
4674def fetch.fail.of(r: Result<&1, &1, Err, Res>) -> Result<&1, &1, Err, Stream>:
4675 match r:
4676 case Fail{e}:
4677 Fail{e}
4678 case Done{res}:
4679 Fail{ErrBad{}}
4680
4681# Reads until the final head is in; the body bytes that came with it are the first piece.
4682@unsafe
4683def stream.head(+tls: Bool, +ms: U32, +head: Bool, st: Socket & Sh) -> IO(Result<&1, &1, Err, Stream>):
4684 (s, sh) = st
4685 match sh:
4686 case ShMore{buf, +k}:
4687 do IO<Result<&1, &1, Err, Stream>>:
4688 m : Socket & Result<&1, &1, U32 & String, U32 & Array<U32>> <- io.recv.words(tls, s, 65536, ms)
4689 stream.head(tls, ms, head, sh.next(head, buf, k, m))
4690 case ShBad{err}:
4691 do IO<Result<&1, &1, Err, Stream>>:
4692 r : Result<&1, &1, Err, Res> <- fetch.bad(tls, s, err)
4693 return fetch.fail.of(r)
4694 case ShRes{res, rb, rest}:
4695 IO.pure(Result<&1, &1, Err, Stream>, Done{stream.mk(tls, s, ms, res, Nil{}, pc.of(rb, rest))})
4696
4697def stream.sent(+tls: Bool, +ms: U32, +head: Bool, m: Socket & Result<&1, &1, U32 & String, Unit>) -> IO(Result<&1, &1, Err, Stream>):
4698 (s, r) = m
4699 match r:
4700 case Fail{(+code, why)}:
4701 do IO<Result<&1, &1, Err, Stream>>:
4702 io.close(tls, s)
4703 return Fail{err.or_late(code, ErrWrite{code, why})}
4704 case Done{u}:
4705 stream.head(tls, ms, head, (s, ShMore{Bytes.new(0), 0}))
4706
4707def stream.conn(r: Result<&1, &1, Err, Conn>, +ms: U32, +head: Bool, wire: Bytes.Bytes) -> IO(Result<&1, &1, Err, Stream>):
4708 match r:
4709 case Fail{e}:
4710 IO.pure(Result<&1, &1, Err, Stream>, Fail{e})
4711 case Done{c}:
4712 match c:
4713 case Conn{+tls, s}:
4714 do IO<Result<&1, &1, Err, Stream>>:
4715 sent : Socket & Result<&1, &1, U32 & String, Unit> <- io.send.bytes(tls, s, wire)
4716 stream.sent(tls, ms, head, sent)
4717 case ConnH2{s, client}:
4718 do IO<Result<&1, &1, Err, Stream>>:
4719 Wire.tls.close(s)
4720 return Fail{ErrBad{}}
4721
4722# One connection per stream; the request says close.
4723def stream.origin(+ms: U32, +head: Bool, wire: Bytes.Bytes, a: Url.Abs, known: Bool) -> IO(Result<&1, &1, Err, Stream>):
4724 Url.Abs{+scheme, +host, +port, target} = a
4725 match known:
4726 case False{}:
4727 IO.pure(Result<&1, &1, Err, Stream>, Fail{ErrUrl{}})
4728 case True{}:
4729 do IO<Result<&1, &1, Err, Stream>>:
4730 ips : List<&2, String> <- Dns.resolve.all(host)
4731 c : Result<&1, &1, Err, Conn> <- conn.open.all(String.eq(scheme, "https"), ms, host, port, ips, None{}, False{})
4732 stream.conn(c, ms, head, wire)
4733
4734def stream.one.of(+method: String, +url: Url.Abs, +headers: Map<&2, List<&2, String>>, +ms: U32, r: Bytes.Bytes & Bytes.Bytes) -> IO(Hop & Result<&1, &1, Err, Stream>):
4735 Url.Abs{scheme, host, port, +target} = url
4736 (body, wire) = r
4737 do IO<Hop & Result<&1, &1, Err, Stream>>:
4738 got : Result<&1, &1, Err, Stream> <- stream.origin(ms, String.eq(method, "HEAD"), encode_req.on(method, target, Url.host_field(url), headers, wire, True{}), url, pool.scheme.ok(url))
4739 return (Hop{method, url, headers, body}, got)
4740
4741# One request on its own connection. The hop comes back for the redirect.
4742def stream.one(h: Hop, +ms: U32) -> IO(Hop & Result<&1, &1, Err, Stream>):
4743 Hop{+method, +url, +headers, body} = h
4744 stream.one.of(method, url, headers, ms, Bytes.slice(body, 0, 4294967295))
4745
4746# Go: the next request. Drop: close this stream, then go on. Done: the answer.
4747type Sn is Type:
4748 SnGo{left: Nat, hop: Hop}
4749 SnDrop{st: Stream, next: Next}
4750 SnDone{r: Result<&1, &1, Err, Stream>}
4751
4752def sn.of(n: Next) -> Sn:
4753 match n:
4754 case NGo{l, h}:
4755 SnGo{l, h}
4756 case NStop{}:
4757 SnDone{Fail{ErrRedirect{}}}
4758 case NDone{m}:
4759 match m:
4760 case Fail{e}:
4761 SnDone{Fail{e}}
4762 case Done{r}:
4763 SnDone{Fail{ErrBad{}}}
4764
4765def stream.decide.n(st: Stream, n: Next) -> Sn:
4766 match n:
4767 case NDone{m}:
4768 SnDone{Done{st}}
4769 case NGo{l, h}:
4770 SnDrop{st, NGo{l, h}}
4771 case NStop{}:
4772 SnDrop{st, NStop{}}
4773
4774def stream.decide.of(+left: Nat, hop: Hop, sr: Stream & Res) -> Sn:
4775 (st, res) = sr
4776 stream.decide.n(st, fetch.decide(left, hop, Done{res}))
4777
4778def stream.decide(+left: Nat, x: Hop & Result<&1, &1, Err, Stream>) -> Sn:
4779 (hop, r) = x
4780 match r:
4781 case Fail{e}:
4782 SnDone{Fail{e}}
4783 case Done{st}:
4784 stream.decide.of(left, hop, stream.res(st))
4785
4786@unsafe
4787def stream.hops(+ms: U32, sn: Sn) -> IO(Result<&1, &1, Err, Stream>):
4788 match sn:
4789 case SnDone{r}:
4790 IO.pure(Result<&1, &1, Err, Stream>, r)
4791 case SnGo{+left, hop}:
4792 do IO<Result<&1, &1, Err, Stream>>:
4793 x : Hop & Result<&1, &1, Err, Stream> <- stream.one(hop, ms)
4794 stream.hops(ms, stream.decide(left, x))
4795 case SnDrop{st, next}:
4796 do IO<Result<&1, &1, Err, Stream>>:
4797 stream.close(st)
4798 stream.hops(ms, sn.of(next))
4799
4800type Opened is Type:
4801 Opened{decs: List<&1, Zlib.Decoder>, bad: Bool}
4802
4803def stream.open.got(st: Opened, r: Result<&1, &1, U32 & String, Zlib.Decoder>) -> Opened:
4804 Opened{decs, bad} = st
4805 match r:
4806 case Fail{e}:
4807 Opened{decs, True{}}
4808 case Done{d}:
4809 Opened{d <> decs, bad}
4810
4811def stream.open.add(st: Opened, m: IO(Result<&1, &1, U32 & String, Zlib.Decoder>)) -> IO(Opened):
4812 do IO<Opened>:
4813 r : Result<&1, &1, U32 & String, Zlib.Decoder> <- m
4814 return stream.open.got(st, r)
4815
4816def stream.open.zstd(zstd: Bool, st: Opened) -> IO(Opened):
4817 match zstd:
4818 case True{}:
4819 stream.open.add(st, Zlib.zstd.new())
4820 case False{}:
4821 IO.pure(Opened, st)
4822
4823def stream.open.br(br: Bool, +c: String, st: Opened) -> IO(Opened):
4824 match br:
4825 case True{}:
4826 stream.open.add(st, Zlib.brotli.new())
4827 case False{}:
4828 stream.open.zstd(String.eq(c, "zstd"), st)
4829
4830def stream.open.gz(gz: Bool, +c: String, st: Opened) -> IO(Opened):
4831 match gz:
4832 case True{}:
4833 stream.open.add(st, Zlib.inflate.new())
4834 case False{}:
4835 stream.open.br(String.eq(c, "br"), c, st)
4836
4837def stream.open.step(+c: String, st: Opened) -> IO(Opened):
4838 Opened{decs, bad} = st
4839 match bad:
4840 case True{}:
4841 IO.pure(Opened, Opened{decs, True{}})
4842 case False{}:
4843 stream.open.gz(Bool.or(String.eq(c, "gzip"), Bool.or(String.eq(c, "x-gzip"), String.eq(c, "deflate"))),
4844 c, Opened{decs, False{}})
4845
4846def stream.open.one(prev: IO(Opened), c: String) -> IO(Opened):
4847 do IO<Opened>:
4848 st : Opened <- prev
4849 stream.open.step(c, st)
4850
4851def stream.open.all(cs: List<&2, String>) -> IO(Opened):
4852 List.foldl(~&2, ~String, ~IO(Opened), ~stream.open.one, cs, IO.pure(Opened, Opened{Nil{}, False{}}))
4853
4854def stream.put.decs(st: Stream, decs: List<&1, Zlib.Decoder>) -> Stream:
4855 Stream{tls, s, ms, res, rb, out, old} = st
4856 Stream{tls, s, ms, res, rb, out, decs}
4857
4858def stream.init.opened(st: Stream, opened: Opened) -> IO(Result<&1, &1, Err, Stream>):
4859 Opened{decs, bad} = opened
4860 match bad:
4861 case True{}:
4862 do IO<Result<&1, &1, Err, Stream>>:
4863 stream.close(stream.put.decs(st, decs))
4864 return Fail{ErrBad{}}
4865 case False{}:
4866 IO.pure(Result<&1, &1, Err, Stream>, Done{stream.put.decs(st, List.reverse(&1, Zlib.Decoder, decs))})
4867
4868def stream.init.known(known: Bool, st: Stream, cs: List<&2, String>) -> IO(Result<&1, &1, Err, Stream>):
4869 match known:
4870 case False{}:
4871 IO.pure(Result<&1, &1, Err, Stream>, Done{st})
4872 case True{}:
4873 do IO<Result<&1, &1, Err, Stream>>:
4874 opened : Opened <- stream.open.all(cs)
4875 stream.init.opened(st, opened)
4876
4877def stream.init.st(+enc: String, st: Stream) -> IO(Result<&1, &1, Err, Stream>):
4878 Stream{tls, s, ms, res, rb, out, decs} = st
4879 Res{+status, +headers, body} = res
4880 +cs = List.reverse(&2, String, ce.split(fields(headers, "content-encoding")))
4881 stream.init.known(ce.known(cs, Con{"identity", Con{"x-gzip", ce.split(Con{enc, Nil{}})}}),
4882 Stream{tls, s, ms, Res{status, headers, body}, rb, out, decs}, cs)
4883
4884def stream.init(+enc: String, r: Result<&1, &1, Err, Stream>) -> IO(Result<&1, &1, Err, Stream>):
4885 match r:
4886 case Fail{e}:
4887 IO.pure(Result<&1, &1, Err, Stream>, Fail{e})
4888 case Done{st}:
4889 stream.init.st(enc, st)
4890
4891def stream.start(method: String, headers: Map<&2, List<&2, String>>, body: Bytes.Bytes, u: Maybe<&2, Url.Abs>) -> Sn:
4892 match u:
4893 case None{}:
4894 SnDone{Fail{ErrUrl{}}}
4895 case Some{a}:
4896 SnGo{20n, Hop{method, a, req.put(Map.to_list(&2, List<&2, String>, headers), empty()), body}}
4897
4898# Open a raw stream. Its body bytes and headers remain as sent.
4899def open.raw.with(method: String, url: String, headers: Map<&2, List<&2, String>>, body: Bytes.Bytes, +ms: U32) -> IO(Result<&1, &1, Err, Stream>):
4900 stream.hops(ms, stream.start(method, headers, body, Url.absolute(url)))
4901
4902def open.raw(method: String, url: String, headers: Map<&2, List<&2, String>>, body: Bytes.Bytes) -> IO(Result<&1, &1, Err, Stream>):
4903 open.raw.with(method, url, headers, body, 30000)
4904
4905def open.with.enc(+enc: String, method: String, url: String, headers: Map<&2, List<&2, String>>, body: Bytes.Bytes, +ms: U32) -> IO(Result<&1, &1, Err, Stream>):
4906 do IO<Result<&1, &1, Err, Stream>>:
4907 r : Result<&1, &1, Err, Stream> <-
4908 stream.hops(ms, stream.start(method, accept.enc(headers, enc), body, Url.absolute(url)))
4909 stream.init(enc, r)
4910
4911# Follow redirects, then decode each body piece by Content-Encoding. Unknown codings stay raw.
4912def open.with(method: String, url: String, headers: Map<&2, List<&2, String>>, body: Bytes.Bytes, +ms: U32) -> IO(Result<&1, &1, Err, Stream>):
4913 do IO<Result<&1, &1, Err, Stream>>:
4914 enc : String <- codings()
4915 open.with.enc(enc, method, url, headers, body, ms)
4916
4917def open(method: String, url: String, headers: Map<&2, List<&2, String>>, body: Bytes.Bytes) -> IO(Result<&1, &1, Err, Stream>):
4918 open.with(method, url, headers, body, 30000)
4919
4920# Upload: the request body sent in chunks (RFC 9112 §7.1). err: the first failed write.
4921type Up is Type:
4922 Up{tls: Bool, s: Socket, ms: U32, head: Bool, err: Maybe<&2, Err>}
4923
4924def hex.digit(+n: U32) -> Char:
4925 Chr{Bool.pick(U32, U32.is_lt(n, 10), (48 + n : U32), (87 + n : U32))}
4926
4927def hex.go(k: Nat, +n: U32, acc: String) -> String:
4928 match k:
4929 case 0n:
4930 acc
4931 case 1n+p:
4932 hex.go(p, U32.shrn(n, 4n), SCon{hex.digit(U32.and(n, 15)), acc})
4933
4934def hex.trim(+s: String) -> String:
4935 match s:
4936 case SNil{}:
4937 SNil{}
4938 case SCon{Chr{+c}, +t}:
4939 Bool.pick(String, Bool.and(U32.is_eq(c, 48), Bool.not(String.is_empty(t))), hex.trim(t), SCon{Chr{c}, t})
4940
4941def hex(+n: U32) -> String:
4942 hex.trim(hex.go(8n, n, ""))
4943
4944def up.sent(+tls: Bool, +ms: U32, +head: Bool, m: Socket & Result<&1, &1, U32 & String, Unit>) -> Up:
4945 (s, r) = m
4946 match r:
4947 case Fail{(+code, why)}:
4948 Up{tls, s, ms, head, Some{err.or_late(code, ErrWrite{code, why})}}
4949 case Done{u}:
4950 Up{tls, s, ms, head, None{}}
4951
4952def up.conn(r: Result<&1, &1, Err, Conn>, +ms: U32, +head: Bool, wire: String) -> IO(Result<&1, &1, Err, Up>):
4953 match r:
4954 case Fail{e}:
4955 IO.pure(Result<&1, &1, Err, Up>, Fail{e})
4956 case Done{c}:
4957 match c:
4958 case Conn{+tls, s}:
4959 do IO<Result<&1, &1, Err, Up>>:
4960 sent : Socket & Result<&1, &1, U32 & String, Unit> <- io.send.bytes(tls, s, Bytes.from_string(wire))
4961 return Done{up.sent(tls, ms, head, sent)}
4962 case ConnH2{s, client}:
4963 do IO<Result<&1, &1, Err, Up>>:
4964 Wire.tls.close(s)
4965 return Fail{ErrBad{}}
4966
4967def up.head(+method: String, +target: String, +hf: String, +headers: Map<&2, List<&2, String>>) -> String:
4968 request(method, target, set(set(set(req.put(Map.to_list(&2, List<&2, String>, headers), empty()), "host", hf), "connection", "close"), "transfer-encoding", "chunked"), "")
4969
4970def up.origin(+method: String, +ms: U32, headers: Map<&2, List<&2, String>>, a: Url.Abs, known: Bool) -> IO(Result<&1, &1, Err, Up>):
4971 Url.Abs{+scheme, +host, +port, +target} = a
4972 match known:
4973 case False{}:
4974 IO.pure(Result<&1, &1, Err, Up>, Fail{ErrUrl{}})
4975 case True{}:
4976 do IO<Result<&1, &1, Err, Up>>:
4977 ips : List<&2, String> <- Dns.resolve.all(host)
4978 c : Result<&1, &1, Err, Conn> <- conn.open.all(String.eq(scheme, "https"), ms, host, port, ips, None{}, False{})
4979 up.conn(c, ms, String.eq(method, "HEAD"), up.head(method, target, Url.host_field(a), headers))
4980
4981def up.url(+method: String, +ms: U32, headers: Map<&2, List<&2, String>>, u: Maybe<&2, Url.Abs>) -> IO(Result<&1, &1, Err, Up>):
4982 match u:
4983 case None{}:
4984 IO.pure(Result<&1, &1, Err, Up>, Fail{ErrUrl{}})
4985 case Some{+a}:
4986 up.origin(method, ms, headers, a, pool.scheme.ok(a))
4987
4988# Http.upload(method, url, headers) sends the head. A streamed body cannot be replayed, so redirects are not followed.
4989def upload.with(+method: String, url: String, headers: Map<&2, List<&2, String>>, +ms: U32) -> IO(Result<&1, &1, Err, Up>):
4990 up.url(method, ms, headers, Url.absolute(url))
4991
4992def upload(+method: String, url: String, headers: Map<&2, List<&2, String>>) -> IO(Result<&1, &1, Err, Up>):
4993 upload.with(method, url, headers, 30000)
4994
4995def up.wrote(+tls: Bool, +ms: U32, +head: Bool, m: Socket & Result<&1, &1, U32 & String, Unit>) -> Up & Result<&2, &2, Err, Unit>:
4996 (s, r) = m
4997 match r:
4998 case Fail{(+code, why)}:
4999 +e = err.or_late(code, ErrWrite{code, why})
5000 (Up{tls, s, ms, head, Some{e}}, Fail{e})
5001 case Done{u}:
5002 (Up{tls, s, ms, head, None{}}, Done{Unit{}})
5003
5004# One write per chunk, so the size line and the data do not wait on each other (Nagle).
5005def up.put(+tls: Bool, s: Socket, +ms: U32, +head: Bool, +len: U32, piece: Bytes.Bytes, skip: Bool) -> IO(Up & Result<&2, &2, Err, Unit>):
5006 match skip:
5007 case True{}:
5008 IO.pure(Up & Result<&2, &2, Err, Unit>, (Up{tls, s, ms, head, None{}}, Done{Unit{}}))
5009 case False{}:
5010 do IO<Up & Result<&2, &2, Err, Unit>>:
5011 sent : Socket & Result<&1, &1, U32 & String, Unit> <- io.send.bytes(tls, s, Bytes.concat(Con{Bytes.from_string(hex(len) ++ "\r\n"), Con{piece, Con{Bytes.from_string("\r\n"), Nil{}}}}))
5012 return up.wrote(tls, ms, head, sent)
5013
5014def up.chunk(+tls: Bool, s: Socket, +ms: U32, +head: Bool, piece: Bytes.Bytes) -> IO(Up & Result<&2, &2, Err, Unit>):
5015 Bytes.Bytes{+len, buf} = piece
5016 up.put(tls, s, ms, head, len, Bytes.Bytes{len, buf}, U32.is_zero(len))
5017
5018# One chunk. An empty piece sends nothing, since an empty chunk would end the body.
5019def upload.write(up: Up, piece: Bytes.Bytes) -> IO(Up & Result<&2, &2, Err, Unit>):
5020 Up{+tls, s, +ms, +head, err} = up
5021 match err:
5022 case Some{+e}:
5023 IO.pure(Up & Result<&2, &2, Err, Unit>, (Up{tls, s, ms, head, Some{e}}, Fail{e}))
5024 case None{}:
5025 up.chunk(tls, s, ms, head, piece)
5026
5027# Ends the body and returns the response as a stream.
5028def upload.finish(up: Up) -> IO(Result<&1, &1, Err, Stream>):
5029 Up{+tls, s, +ms, +head, err} = up
5030 match err:
5031 case Some{e}:
5032 do IO<Result<&1, &1, Err, Stream>>:
5033 io.close(tls, s)
5034 return Fail{e}
5035 case None{}:
5036 do IO<Result<&1, &1, Err, Stream>>:
5037 sent : Socket & Result<&1, &1, U32 & String, Unit> <- io.send.bytes(tls, s, Bytes.from_string("0\r\n\r\n"))
5038 stream.sent(tls, ms, head, sent)
5039
5040type ServerConfig is Data:
5041 ServerConfig{host: String, port: U32, body_bytes: U32, header_bytes: U32,
5042 connections: U32, requests: U32, buffered: U32, header_ms: U32, body_ms: U32,
5043 idle_ms: U32, write_ms: U32}
5044
5045# Shared framing settings; all live readers reserve admission before allocation.
5046type Limits is Data:
5047 Limits{body: Nat, headers: U32, header_ms: U32, body_ms: U32, idle_ms: U32, write_ms: U32}
5048
5049# Bytes.words rounds with len+3 in U32. A retained cap plus the fixed 65536
5050# receive overshoot must still fit before that addition, including temporary copies.
5051def limits.representable() -> U32:
5052 4294901756
5053
5054def limits.validate.ok(valid: Bool) -> IO(Unit):
5055 match valid:
5056 case True{}:
5057 IO.pure(Unit, Unit{})
5058 case False{}:
5059 IO.die(Unit, 22, "request cap plus 65536-byte recv overshoot and 3-byte packed rounding must fit U32")
5060
5061def limits.validate(+max: Nat) -> IO(Unit):
5062 limits.validate.ok(Nat.is_gt(max, 0n) && Nat.is_le(max, U32.to_nat(limits.representable())))
5063
5064def limits(max: Nat) -> Limits:
5065 Limits{max, 65536, 5000, 30000, 30000, 30000}
5066
5067def limits.config(config: ServerConfig) -> Limits:
5068 ServerConfig{host, port, body, headers, connections, requests, buffered, header_ms, body_ms, idle_ms, write_ms} = config
5069 Limits{U32.to_nat(body), headers, header_ms, body_ms, idle_ms, write_ms}
5070
5071# One absolute deadline, never replenished by progress.
5072type Phase is Data:
5073 Phase{kind: U32, until: Time.Duration}
5074
5075def phase.new(+kind: U32, ms: U32, now: Time.Duration) -> Phase:
5076 Phase{kind, Time.Duration.add(now, Time.Duration.of_ms(ms))}
5077
5078def phase.remaining(+until: Time.Duration, +now: Time.Duration) -> U32:
5079 Bool.pick(U32, Cmp.is_lt(Time.Duration.cmp(now, until)),
5080 U32.max(1, Int.I64.to_u32(Time.Duration.to_ms(Time.Duration.sub(until, now)))), 0)
5081
5082def bounded.sent(m: Socket & (U32 & Result<&1, &1, U32 & String, Unit>)) -> Socket & Result<&1, &1, U32 & String, Unit>:
5083 (s, (accepted, result)) = m
5084 (s, result)
5085
5086def bounded.send.ready(expired: Bool, s: Socket, b: Bytes.Bytes, ms: U32) -> IO(Socket & Result<&1, &1, U32 & String, Unit>):
5087 match expired:
5088 case True{}:
5089 IO.pure(Socket & Result<&1, &1, U32 & String, Unit>, (s, Fail{(60, "write deadline expired")}))
5090 case False{}:
5091 Bytes.Bytes{len, words} = b
5092 do IO<Socket & Result<&1, &1, U32 & String, Unit>>:
5093 sent : Socket & (U32 & Result<&1, &1, U32 & String, Unit>) <- Wire.send.words.deadline(s, len, words, ms)
5094 return bounded.sent(sent)
5095
5096def bounded.send(s: Socket, b: Bytes.Bytes, until: Time.Duration) -> IO(Socket & Result<&1, &1, U32 & String, Unit>):
5097 do IO<Socket & Result<&1, &1, U32 & String, Unit>>:
5098 now : Time.Duration <- Time.mono()
5099 +ms : U32 = phase.remaining(until, now)
5100 bounded.send.ready(U32.is_zero(ms), s, b, ms)
5101
5102def reply.bytes(res: Res, head: Bool, close: Bool) -> Bytes.Bytes:
5103 Res{+status, +headers, body} = res
5104 encode.on(Res{status, Bool.pick(Map<&2, List<&2, String>>, close, set(headers, "connection", "close"), headers), body}, head)
5105
5106def reply.fail.bytes(+status: U32) -> Res:
5107 Res{status, set(empty(), "connection", "close"), Bytes.from_string(reason(status))}
5108
5109def reply.drain.of(m: Socket & Result<&1, &1, U32 & String, U32 & Array<U32>>) -> Socket & Bool:
5110 (s, r) = m
5111 match r:
5112 case Fail{e}:
5113 (s, False{})
5114 case Done{data}:
5115 (len, words) = data
5116 (s, Bool.not(U32.is_zero(len)))
5117
5118# ponytail: cap drain at 32 MiB and 2.55 s; use socket half-close if larger peers need guaranteed delivery.
5119def reply.drain(n: Nat, alive: Bool, +until: Time.Duration, st: Socket & Bool) -> IO(Unit):
5120 match n:
5121 case 0n:
5122 (s, more) = st
5123 Socket.close(s)
5124 case 1n+p:
5125 match alive:
5126 case False{}:
5127 (s, more) = st
5128 Socket.close(s)
5129 case True{}:
5130 (s, more) = st
5131 match more:
5132 case False{}:
5133 Socket.close(s)
5134 case True{}:
5135 do IO<Unit>:
5136 got : Socket & Result<&1, &1, U32 & String, U32 & Array<U32>> <- Wire.recv.words(s, 65536, 50)
5137 now : Time.Duration <- Time.mono()
5138 reply.drain(p, Cmp.is_lt(Time.Duration.cmp(now, until)), until, reply.drain.of(got))
5139
5140def reply.sent.close(m: Socket & Result<&1, &1, U32 & String, Unit>) -> IO(Unit):
5141 (s, r) = m
5142 match r:
5143 case Fail{e}:
5144 Socket.close(s)
5145 case Done{u}:
5146 do IO<Unit>:
5147 now : Time.Duration <- Time.mono()
5148 reply.drain(U32.to_nat(512), True{}, Time.Duration.add(now, Time.Duration.of_ms(2500)), (s, True{}))
5149
5150def reply.sent.observe(observer: Completion.Receipt, status: U32,
5151 sent: Socket & Result<&1, &1, U32 & String, Unit>) -> IO(Unit):
5152 (socket, result) = sent
5153 match result:
5154 case Fail{(code, message)}:
5155 do IO<Unit>:
5156 Socket.close(socket)
5157 Completion.report(observer, status, Completion.WriteFailed{code, message})
5158 case Done{unit}:
5159 do IO<Unit>:
5160 reply.sent.close((socket, Done{unit}))
5161 Completion.report(observer, status, Completion.HostAccepted{})
5162
5163
5164def reply_fail(observer: Completion.Receipt, s: Socket, +status: U32, ms: U32) -> IO(Unit):
5165 do IO<Unit>:
5166 now : Time.Duration <- Time.mono()
5167 sent : Socket & Result<&1, &1, U32 & String, Unit> <-
5168 bounded.send(s, encode(reply.fail.bytes(status)), Time.Duration.add(now, Time.Duration.of_ms(ms)))
5169 reply.sent.observe(observer, status, sent)
5170
5171
5172# The head is parsed once, when it is whole. Body pieces are kept as they come and joined once.
5173type Sv is Type:
5174 SvHead{buf: Bytes.Bytes}
5175 SvLen{req: Req, v11: Bool, left: U32, parts: List<&1, Bytes.Bytes>}
5176 SvChunk{req: Req, v11: Bool, n: U32, st: Dc, parts: List<&1, Bytes.Bytes>}
5177
5178type InputOperation is Data:
5179 ReadInput{}
5180 SendContinue{}
5181
5182# More: read on, first answering 100 Continue when cont is set.
5183type Turn is Type:
5184 TurnClose{}
5185 TurnInputFailed{operation: InputOperation, code: U32, message: String}
5186 TurnFail{status: U32}
5187 TurnReq{req: Req, rest: Bytes.Bytes, v11: Bool}
5188 TurnMore{sv: Sv, cont: Bool}
5189
5190def serve.max() -> Nat:
5191 fetch.max()
5192
5193def sv.none() -> Sv:
5194 SvHead{Bytes.new(0)}
5195
5196def sv.body(req: Req, +v11: Bool, parts: List<&1, Bytes.Bytes>, rest: Bytes.Bytes) -> Turn:
5197 Req{method, path, headers, body} = req
5198 TurnReq{Req{method, path, headers, rb.body(parts)}, rest, v11}
5199
5200def sv.len.cut(req: Req, +v11: Bool, parts: List<&1, Bytes.Bytes>, +len: U32, +left: U32, r: Bytes.Bytes & Bytes.Bytes) -> Turn:
5201 (piece, last) = r
5202 sv.body(req, v11, Con{last, parts}, bytes.snd(Bytes.slice(piece, left, (len - left : U32))))
5203
5204def sv.len.have(short: Bool, req: Req, +v11: Bool, +left: U32, parts: List<&1, Bytes.Bytes>, +len: U32, piece: Bytes.Bytes) -> Turn:
5205 match short:
5206 case True{}:
5207 TurnMore{SvLen{req, v11, (left - len : U32), Con{piece, parts}}, False{}}
5208 case False{}:
5209 sv.len.cut(req, v11, parts, len, left, Bytes.slice(piece, 0, left))
5210
5211def sv.len(req: Req, +v11: Bool, +left: U32, parts: List<&1, Bytes.Bytes>, piece: Bytes.Bytes) -> Turn:
5212 Bytes.Bytes{+len, buf} = piece
5213 sv.len.have(U32.is_lt(len, left), req, v11, left, parts, len, Bytes.Bytes{len, buf})
5214
5215def sv.chunk.of(req: Req, +v11: Bool, +n: U32, c: Ck) -> Turn:
5216 Ck{st, parts, rest} = c
5217 match st:
5218 case DcDone{}:
5219 sv.body(req, v11, parts, rest)
5220 case DcBad{}:
5221 TurnFail{400}
5222 case DcSize{a, b}:
5223 TurnMore{SvChunk{req, v11, n, DcSize{a, b}, parts}, False{}}
5224 case DcExt{x}:
5225 TurnMore{SvChunk{req, v11, n, DcExt{x}, parts}, False{}}
5226 case DcSizeLf{x}:
5227 TurnMore{SvChunk{req, v11, n, DcSizeLf{x}, parts}, False{}}
5228 case DcData{k}:
5229 TurnMore{SvChunk{req, v11, n, DcData{k}, parts}, False{}}
5230 case DcDataCr{}:
5231 TurnMore{SvChunk{req, v11, n, DcDataCr{}, parts}, False{}}
5232 case DcDataLf{}:
5233 TurnMore{SvChunk{req, v11, n, DcDataLf{}, parts}, False{}}
5234 case DcTr{j}:
5235 TurnMore{SvChunk{req, v11, n, DcTr{j}, parts}, False{}}
5236
5237def sv.chunk.parts.cons(+len: U32, buf: Array<U32>, counted: List<&1, Bytes.Bytes> & Nat) -> List<&1, Bytes.Bytes> & Nat:
5238 (rest, n) = counted
5239 (Con{Bytes.Bytes{len, buf}, rest}, Nat.add(U32.to_nat(len), n))
5240
5241def sv.chunk.parts(xs: List<&1, Bytes.Bytes>, old: List<&1, Bytes.Bytes>) -> List<&1, Bytes.Bytes> & Nat:
5242 match xs:
5243 case Nil{}:
5244 (old, 0n)
5245 case Con{b, tail}:
5246 Bytes.Bytes{+len, buf} = b
5247 sv.chunk.parts.cons(len, buf, sv.chunk.parts(tail, old))
5248
5249def sv.chunk.cap(big: Bool, req: Req, +v11: Bool, n: U32, st: Dc, parts: List<&1, Bytes.Bytes>, rest: Bytes.Bytes) -> Turn:
5250 match big:
5251 case True{}:
5252 TurnFail{413}
5253 case False{}:
5254 sv.chunk.of(req, v11, n, Ck{st, parts, rest})
5255
5256def sv.chunk.counted(+max: Nat, req: Req, v11: Bool, n: U32, st: Dc, rest: Bytes.Bytes, counted: List<&1, Bytes.Bytes> & Nat) -> Turn:
5257 (parts, size) = counted
5258 +total = Nat.add(U32.to_nat(n), size)
5259 sv.chunk.cap(Nat.is_lt(max, total) || Nat.is_lt(U32.to_nat(4294967295), total), req, v11,
5260 U32.from_nat(total), st, parts, rest)
5261
5262def sv.chunk.decoded(max: Nat, req: Req, v11: Bool, n: U32, old: List<&1, Bytes.Bytes>, c: Ck) -> Turn:
5263 Ck{st, parts, rest} = c
5264 sv.chunk.counted(max, req, v11, n, st, rest, sv.chunk.parts(parts, old))
5265
5266def sv.chunk(+max: Nat, req: Req, +v11: Bool, +n: U32, st: Dc, parts: List<&1, Bytes.Bytes>, piece: Bytes.Bytes) -> Turn:
5267 sv.chunk.decoded(max, req, v11, n, parts, ck(piece, st, Nil{}))
5268
5269# RFC 9110 §10.1.1: answer 100 Continue only when the body is still to come.
5270def sv.cont(want: Bool, t: Turn) -> Turn:
5271 match t:
5272 case TurnMore{sv, c}:
5273 TurnMore{sv, want}
5274 case TurnClose{}:
5275 TurnClose{}
5276 case TurnInputFailed{operation, code, message}:
5277 TurnInputFailed{operation, code, message}
5278 case TurnFail{s}:
5279 TurnFail{s}
5280 case TurnReq{req, rest, v11}:
5281 TurnReq{req, rest, v11}
5282
5283def sv.cl.k(big: Bool, req: Req, +v11: Bool, +k: U32, rest: Bytes.Bytes) -> Turn:
5284 match big:
5285 case True{}:
5286 TurnFail{413}
5287 case False{}:
5288 sv.len(req, v11, k, Nil{}, rest)
5289
5290def sv.cl(+max: Nat, req: Req, +v11: Bool, rest: Bytes.Bytes, n: Maybe<&2, U32>) -> Turn:
5291 match n:
5292 case None{}:
5293 TurnFail{400}
5294 case Some{+k}:
5295 sv.cl.k(Nat.is_lt(max, U32.to_nat(k)), req, v11, k, rest)
5296
5297def sv.frame(+max: Nat, req: Req, +v11: Bool, rest: Bytes.Bytes, te: Bool) -> Turn:
5298 Req{method, path, +headers, body} = req
5299 match te:
5300 case True{}:
5301 sv.chunk(max, Req{method, path, headers, body}, v11, 0, dc.start(), Nil{}, rest)
5302 case False{}:
5303 sv.cl(max, Req{method, path, headers, body}, v11, rest, parse_u32(header(headers, "content-length")))
5304
5305def sv.expects(+v11: Bool, +headers: Map<&2, List<&2, String>>) -> Bool:
5306 Bool.and(v11, String.eq(String.to_lower(header(headers, "expect")), "100-continue"))
5307
5308def sv.got.head(+max: Nat, +v11: Bool, rest: Bytes.Bytes, req: Req) -> Turn:
5309 Req{method, path, +headers, body} = req
5310 sv.cont(sv.expects(v11, headers), sv.frame(max, Req{method, path, headers, body}, v11, rest, has_header(headers, "transfer-encoding")))
5311
5312def sv.parsed(+max: Nat, +v11: Bool, rest: Bytes.Bytes, g: Got) -> Turn:
5313 match g:
5314 case GotBad{}:
5315 TurnFail{400}
5316 case GotMore{}:
5317 TurnFail{400}
5318 case GotReq{req}:
5319 TurnReq{req, rest, v11}
5320 case GotHead{req}:
5321 sv.got.head(max, v11, rest, req)
5322
5323def sv.split(+max: Nat, +hlen: U32, +len: U32, r: Bytes.Bytes & Bytes.Bytes) -> Turn:
5324 (buf, hb) = r
5325 +head = Bytes.to_string(hb)
5326 sv.parsed(max, req.v11(head), bytes.snd(Bytes.slice(buf, hlen, (len - hlen : U32))), parse.got(head))
5327
5328def sv.hit.none(big: Bool, buf: Bytes.Bytes) -> Turn:
5329 match big:
5330 case True{}:
5331 TurnFail{431}
5332 case False{}:
5333 TurnMore{SvHead{buf}, False{}}
5334
5335def sv.hit.some(big: Bool, +max: Nat, +hlen: U32, +len: U32, buf: Bytes.Bytes) -> Turn:
5336 match big:
5337 case True{}:
5338 TurnFail{431}
5339 case False{}:
5340 sv.split(max, hlen, len, Bytes.slice(buf, 0, hlen))
5341
5342# RFC 6585 §5: refuse a head over the configured byte limit.
5343def sv.hit(+max: Nat, +headers: U32, +len: U32, buf: Bytes.Bytes, at: Maybe<&2, U32>) -> Turn:
5344 match at:
5345 case None{}:
5346 sv.hit.none(U32.is_lt(headers, len), buf)
5347 case Some{+i}:
5348 +hlen = (i + 4 : U32)
5349 sv.hit.some(U32.is_lt(headers, hlen), max, hlen, len, buf)
5350
5351def sv.seek.of(+max: Nat, +headers: U32, +len: U32, +from: U32, buf: Bytes.Bytes, r: Bytes.Bytes & Maybe<&2, U32>) -> Turn:
5352 (tail, m) = r
5353 sv.hit(max, headers, len, buf, found.at(from, m))
5354
5355def sv.seek(+max: Nat, +headers: U32, +len: U32, +from: U32, r: Bytes.Bytes & Bytes.Bytes) -> Turn:
5356 (buf, tail) = r
5357 sv.seek.of(max, headers, len, from, buf, Bytes.find(tail, "\r\n\r\n"))
5358
5359# Only the new bytes, and the 3 before them, can finish the blank line.
5360def sv.head.at(+max: Nat, +headers: U32, +from: U32, buf: Bytes.Bytes) -> Turn:
5361 Bytes.Bytes{+len, b} = buf
5362 sv.seek(max, headers, len, from, Bytes.slice(Bytes.Bytes{len, b}, from, (len - from : U32)))
5363
5364def sv.head(+max: Nat, +headers: U32, buf: Bytes.Bytes, piece: Bytes.Bytes) -> Turn:
5365 Bytes.Bytes{+ol, ob} = buf
5366 sv.head.at(max, headers, Bool.pick(U32, U32.is_lt(ol, 3), 0, (ol - 3 : U32)), Bytes.append(Bytes.Bytes{ol, ob}, piece))
5367
5368def sv.closed.pick(empty: Bool) -> Turn:
5369 match empty:
5370 case True{}:
5371 TurnClose{}
5372 case False{}:
5373 TurnFail{400}
5374
5375def sv.closed.head(buf: Bytes.Bytes) -> Turn:
5376 Bytes.Bytes{+len, b} = buf
5377 sv.closed.pick(U32.is_eq(len, 0))
5378
5379# A close mid-request is a request cut short (RFC 9112 §8).
5380def sv.step(closed: Bool, +max: Nat, +headers: U32, sv: Sv, piece: Bytes.Bytes) -> Turn:
5381 match closed:
5382 case True{}:
5383 match sv:
5384 case SvHead{buf}:
5385 sv.closed.head(buf)
5386 case SvLen{req, v11, left, parts}:
5387 TurnFail{400}
5388 case SvChunk{req, v11, n, st, parts}:
5389 TurnFail{400}
5390 case False{}:
5391 match sv:
5392 case SvHead{buf}:
5393 sv.head(max, headers, buf, piece)
5394 case SvLen{req, +v11, +left, parts}:
5395 sv.len(req, v11, left, parts, piece)
5396 case SvChunk{req, +v11, +n, st, parts}:
5397 sv.chunk(max, req, v11, n, st, parts, piece)
5398
5399def sv.frame.req(t: Turn) -> Maybe<&1, String & String>:
5400 match t:
5401 case TurnReq{req, rest, v11}:
5402 Req{method, path, headers, body} = req
5403 Some{(Bytes.to_string(body), Bytes.to_string(rest))}
5404 case TurnMore{sv, c}:
5405 None{}
5406 case TurnFail{s}:
5407 None{}
5408 case TurnClose{}:
5409 None{}
5410 case TurnInputFailed{operation, code, message}:
5411 None{}
5412
5413def sv.frame.go(xs: List<&2, String>, t: Turn) -> Maybe<&1, String & String>:
5414 match xs:
5415 case Nil{}:
5416 sv.frame.req(t)
5417 case Con{+x, rest}:
5418 match t:
5419 case TurnMore{sv, c}:
5420 sv.frame.go(rest, sv.step(False{}, serve.max(), 65536, sv, Bytes.from_string(x)))
5421 case TurnReq{req, r, v11}:
5422 sv.frame.req(TurnReq{req, r, v11})
5423 case TurnFail{s}:
5424 None{}
5425 case TurnClose{}:
5426 None{}
5427 case TurnInputFailed{operation, code, message}:
5428 None{}
5429
5430# The body and the bytes after it, once the pieces make a whole request; None otherwise.
5431def serve.frame(xs: List<&2, String>) -> Maybe<&1, String & String>:
5432 sv.frame.go(xs, TurnMore{sv.none(), False{}})
5433
5434def talk.piece(settings: Limits, sv: Sv, p: U32 & Array<U32>) -> Turn:
5435 Limits{max, headers, hm, bm, im, wm} = settings
5436 (+len, buf) = p
5437 sv.step(U32.is_eq(len, 0), max, headers, sv, Bytes.Bytes{len, buf})
5438
5439def talk.next(settings: Limits, sv: Sv, m: Socket & Result<&1, &1, U32 & String, U32 & Array<U32>>) -> Socket & Turn:
5440 (s, r) = m
5441 match r:
5442 case Fail{(+code, message)}:
5443 (s, Bool.pick(Turn, err.late(code), TurnFail{408}, TurnInputFailed{ReadInput{}, code, message}))
5444 case Done{p}:
5445 (s, talk.piece(settings, sv, p))
5446
5447def talk.after.pick(empty: Bool, settings: Limits, rest: Bytes.Bytes) -> Turn:
5448 match empty:
5449 case True{}:
5450 TurnMore{sv.none(), False{}}
5451 case False{}:
5452 Limits{max, headers, hm, bm, im, wm} = settings
5453 sv.step(False{}, max, headers, sv.none(), rest)
5454
5455def talk.after.rest(settings: Limits, rest: Bytes.Bytes, s: Socket) -> Socket & Turn:
5456 Bytes.Bytes{+len, buf} = rest
5457 (s, talk.after.pick(U32.is_eq(len, 0), settings, Bytes.Bytes{len, buf}))
5458
5459def talk.after.keep(keep: Bool, settings: Limits, rest: Bytes.Bytes, s: Socket) -> Socket & Turn:
5460 match keep:
5461 case False{}:
5462 (s, TurnClose{})
5463 case True{}:
5464 talk.after.rest(settings, rest, s)
5465
5466def talk.after(settings: Limits, keep: Bool, rest: Bytes.Bytes, m: Socket & Result<&1, &1, U32 & String, Unit>) -> (Socket & Turn) & Completion.Outcome:
5467 (s, r) = m
5468 match r:
5469 case Fail{(code, message)}:
5470 ((s, TurnClose{}), Completion.WriteFailed{code, message})
5471 case Done{u}:
5472 (talk.after.keep(keep, settings, rest, s), Completion.HostAccepted{})
5473
5474def talk.send(+settings: Limits, s: Socket, rest: Bytes.Bytes, +headers: Map<&2, List<&2, String>>, v11: Bool, +head: Bool, res: Res) -> IO((Socket & Turn) & Completion.Outcome):
5475 Limits{max, cap, hm, bm, im, wm} = settings
5476 Res{+status, +rh, body} = res
5477 +keep = serve.keep(headers, v11, status, rh)
5478 do IO<(Socket & Turn) & Completion.Outcome>:
5479 now : Time.Duration <- Time.mono()
5480 sent : Socket & Result<&1, &1, U32 & String, Unit> <-
5481 bounded.send(s, reply.bytes(Res{status, rh, body}, head, Bool.not(keep)), Time.Duration.add(now, Time.Duration.of_ms(wm)))
5482 return talk.after(settings, keep, rest, sent)
5483
5484def talk.completed.connection(outcome: Completion.Outcome, next: Socket & Turn) -> IO(Maybe<&1, Socket & Turn>):
5485 match outcome:
5486 case Completion.HostAccepted{}:
5487 (socket, turn) = next
5488 IO.pure(Maybe<&1, Socket & Turn>, Some{(socket, turn)})
5489 case Completion.WriteFailed{code, message}:
5490 (socket, turn) = next
5491 do IO<Maybe<&1, Socket & Turn>>:
5492 Socket.close(socket)
5493 return None{}
5494 case Completion.IncompleteResponse{}:
5495 (socket, turn) = next
5496 do IO<Maybe<&1, Socket & Turn>>:
5497 Socket.close(socket)
5498 return None{}
5499
5500def talk.completed(observer: Completion.Receipt, receipt: Completion.Receipt, +status: U32,
5501 sent: (Socket & Turn) & Completion.Outcome) -> IO(Maybe<&1, Socket & Turn>):
5502 (next, outcome) = sent
5503 +observed = {outcome : Completion.Outcome}
5504 do IO<Maybe<&1, Socket & Turn>>:
5505 remaining : Maybe<&1, Socket & Turn> <- talk.completed.connection(observed, next)
5506 Completion.report(observer, status, observed)
5507 Completion.report(receipt, status, observed)
5508 return remaining
5509
5510def talk.respond(observer: Completion.Receipt, +settings: Limits, s: Socket, rest: Bytes.Bytes,
5511 headers: Map<&2, List<&2, String>>, v11: Bool, head: Bool, reply: Reply) -> IO(Maybe<&1, Socket & Turn>):
5512 Reply{Res{+status, rh, body}, receipt} = reply
5513 do IO<Maybe<&1, Socket & Turn>>:
5514 sent : (Socket & Turn) & Completion.Outcome <- talk.send(settings, s, rest, headers, v11, head, Res{status, rh, body})
5515 talk.completed(observer, receipt, status, sent)
5516
5517def talk.cont(cont: Bool, s: Socket, ms: U32) -> IO(Socket & Result<&1, &1, U32 & String, Unit>):
5518 match cont:
5519 case False{}:
5520 IO.pure(Socket & Result<&1, &1, U32 & String, Unit>, (s, Done{Unit{}}))
5521 case True{}:
5522 do IO<Socket & Result<&1, &1, U32 & String, Unit>>:
5523 now : Time.Duration <- Time.mono()
5524 bounded.send(s, Bytes.from_string("HTTP/1.1 100 Continue\r\n\r\n"), Time.Duration.add(now, Time.Duration.of_ms(ms)))
5525
5526def phase.head(empty: Bool, settings: Limits, now: Time.Duration) -> Phase:
5527 match empty:
5528 case True{}:
5529 Limits{max, cap, hm, bm, im, wm} = settings
5530 phase.new(0, im, now)
5531 case False{}:
5532 Limits{max, cap, hm, bm, im, wm} = settings
5533 phase.new(1, hm, now)
5534
5535def phase.start(settings: Limits, sv: Sv, now: Time.Duration) -> Phase & Sv:
5536 Limits{max, cap, hm, bm, im, wm} = settings
5537 match sv:
5538 case SvHead{buf}:
5539 Bytes.Bytes{+len, words} = buf
5540 (phase.head(U32.is_zero(len), Limits{max, cap, hm, bm, im, wm}, now), SvHead{Bytes.Bytes{len, words}})
5541 case SvLen{req, v11, left, parts}:
5542 (phase.new(2, bm, now), SvLen{req, v11, left, parts})
5543 case SvChunk{req, v11, n, st, parts}:
5544 (phase.new(2, bm, now), SvChunk{req, v11, n, st, parts})
5545
5546def phase.select(settings: Limits, sv: Sv, now: Time.Duration, previous: Maybe<&2, Phase>) -> Phase & Sv:
5547 match previous:
5548 case None{}:
5549 phase.start(settings, sv, now)
5550 case Some{phase}:
5551 (phase, sv)
5552
5553# Buffered pipelined headers have already ended before upload callbacks run.
5554def phase.body(previous: Maybe<&2, Phase>, settings: Limits, now: Time.Duration) -> Phase:
5555 match previous:
5556 case Some{phase}:
5557 phase
5558 case None{}:
5559 Limits{max, cap, hm, bm, im, wm} = settings
5560 phase.new(2, bm, now)
5561
5562def phase.after(+settings: Limits, +now: Time.Duration, +phase: Phase, t: Turn) -> Turn & Phase:
5563 Limits{max, cap, hm, bm, im, wm} = settings
5564 Phase{+kind, until} = phase
5565 match t:
5566 case TurnMore{sv, cont}:
5567 match sv:
5568 case SvHead{buf}:
5569 (TurnMore{SvHead{buf}, cont}, Bool.pick(Phase, U32.is_zero(kind), phase.new(1, hm, now), phase))
5570 case SvLen{req, v11, left, parts}:
5571 (TurnMore{SvLen{req, v11, left, parts}, cont}, Bool.pick(Phase, U32.is_eq(kind, 2), phase, phase.new(2, bm, now)))
5572 case SvChunk{req, v11, n, st, parts}:
5573 (TurnMore{SvChunk{req, v11, n, st, parts}, cont}, Bool.pick(Phase, U32.is_eq(kind, 2), phase, phase.new(2, bm, now)))
5574 case TurnReq{req, rest, v11}:
5575 (TurnReq{req, rest, v11}, phase)
5576 case TurnFail{+status}:
5577 (Bool.pick(Turn, U32.is_zero(kind) && U32.is_eq(status, 408), TurnClose{}, TurnFail{status}), phase)
5578 case TurnClose{}:
5579 (TurnClose{}, phase)
5580 case TurnInputFailed{operation, code, message}:
5581 (TurnInputFailed{operation, code, message}, phase)
5582
5583def phase.expired(phase: Phase) -> Turn:
5584 Phase{kind, until} = phase
5585 Bool.pick(Turn, U32.is_zero(kind), TurnClose{}, TurnFail{408})
5586
5587def talk.received.state(s: Socket, next: Turn & Phase) -> (Socket & Turn) & Phase:
5588 (t, p) = next
5589 ((s, t), p)
5590
5591def talk.received.phase(settings: Limits, phase: Phase, now: Time.Duration, next: Socket & Turn) -> (Socket & Turn) & Phase:
5592 (s, t) = next
5593 talk.received.state(s, phase.after(settings, now, phase, t))
5594
5595def talk.received.late(expired: Bool, +settings: Limits, +phase: Phase, now: Time.Duration, sv: Sv, m: Socket & Result<&1, &1, U32 & String, U32 & Array<U32>>) -> (Socket & Turn) & Phase:
5596 match expired:
5597 case True{}:
5598 (s, r) = m
5599 ((s, phase.expired(phase)), phase)
5600 case False{}:
5601 talk.received.phase(settings, phase, now, talk.next(settings, sv, m))
5602
5603# A real host read slice returns its socket; no raced operation is abandoned.
5604# The original absolute phase survives slice timeouts and stop observations.
5605# Admitted streamed uploads retain their state and finish; unadmitted input closes.
5606def talk.read.running(held: Bool, inbox: Chan(Admission.Command)) -> IO(Bool):
5607 match held:
5608 case True{}: IO.pure(Bool, True{})
5609 case False{}: Admission.running(inbox)
5610
5611type ReadStep is Type:
5612 ReadChecking{socket: Socket, state: Sv, phase: Phase}
5613 ReadAllowed{running: Bool, socket: Socket, state: Sv, phase: Phase}
5614 ReadBudget{ms: U32, socket: Socket, state: Sv, phase: Phase}
5615 ReadReceived{state: Sv, phase: Phase, now: Time.Duration,
5616 result: Socket & Result<&1, &1, U32 & String, U32 & Array<U32>>}
5617 ReadFailed{retry: Bool, socket: Socket, state: Sv, phase: Phase,
5618 now: Time.Duration, error: U32 & String}
5619
5620# One state machine owns the socket through each actual host return.
5621@unsafe
5622def talk.read.loop(+inbox: Chan(Admission.Command), +held: Bool, +settings: Limits,
5623 step: ReadStep) -> IO((Socket & Turn) & Phase):
5624 match step:
5625 case ReadChecking{s, sv, phase}:
5626 do IO<(Socket & Turn) & Phase>:
5627 running : Bool <- talk.read.running(held, inbox)
5628 talk.read.loop(inbox, held, settings, ReadAllowed{running, s, sv, phase})
5629 case ReadAllowed{running, s, sv, +phase}:
5630 match running:
5631 case False{}:
5632 IO.pure((Socket & Turn) & Phase, ((s, TurnClose{}), phase))
5633 case True{}:
5634 Phase{kind, until} = phase
5635 do IO<(Socket & Turn) & Phase>:
5636 now : Time.Duration <- Time.mono()
5637 +ms : U32 = phase.remaining(until, now)
5638 talk.read.loop(inbox, held, settings,
5639 ReadBudget{Bool.pick(U32, held, ms, U32.min(ms, 50)), s, sv, phase})
5640 case ReadBudget{ms, s, sv, +phase}:
5641 match ms:
5642 case 0:
5643 IO.pure((Socket & Turn) & Phase, ((s, phase.expired(phase)), phase))
5644 case _:
5645 do IO<(Socket & Turn) & Phase>:
5646 got : Socket & Result<&1, &1, U32 & String, U32 & Array<U32>> <- Wire.recv.words(s, 65536, ms)
5647 now : Time.Duration <- Time.mono()
5648 talk.read.loop(inbox, held, settings, ReadReceived{sv, phase, now, got})
5649 case ReadReceived{sv, +phase, +now, got}:
5650 Phase{kind, until} = phase
5651 (s, result) = got
5652 match result:
5653 case Fail{(+code, message)}:
5654 talk.read.loop(inbox, held, settings,
5655 ReadFailed{err.late(code) && Cmp.is_lt(Time.Duration.cmp(now, until)), s, sv, phase, now, (code, message)})
5656 case Done{packed}:
5657 IO.pure((Socket & Turn) & Phase,
5658 talk.received.late(Bool.not(Cmp.is_lt(Time.Duration.cmp(now, until))), settings, phase, now, sv, (s, Done{packed})))
5659 case ReadFailed{retry, s, sv, +phase, +now, error}:
5660 match retry:
5661 case True{}:
5662 talk.read.loop(inbox, held, settings, ReadChecking{s, sv, phase})
5663 case False{}:
5664 Phase{kind, until} = phase
5665 IO.pure((Socket & Turn) & Phase,
5666 talk.received.late(Bool.not(Cmp.is_lt(Time.Duration.cmp(now, until))), settings, phase, now, sv, (s, Fail{error})))
5667
5668def talk.read(+inbox: Chan(Admission.Command), held: Bool, +settings: Limits, sv: Sv, phase: Phase, m: Socket & Result<&1, &1, U32 & String, Unit>) -> IO((Socket & Turn) & Phase):
5669 (s, r) = m
5670 match r:
5671 case Fail{(code, message)}:
5672 IO.pure((Socket & Turn) & Phase, ((s, TurnInputFailed{SendContinue{}, code, message}), phase))
5673 case Done{u}:
5674 talk.read.loop(inbox, held, settings, ReadChecking{s, sv, phase})
5675
5676def talk.recv.selected(+inbox: Chan(Admission.Command), held: Bool, +settings: Limits, s: Socket, cont: Bool, selected: Phase & Sv) -> IO((Socket & Turn) & Phase):
5677 Limits{max, cap, hm, bm, im, wm} = settings
5678 (phase, state) = selected
5679 do IO<(Socket & Turn) & Phase>:
5680 sent : Socket & Result<&1, &1, U32 & String, Unit> <- talk.cont(cont, s, wm)
5681 talk.read(inbox, held, settings, state, phase, sent)
5682
5683def talk.recv(+inbox: Chan(Admission.Command), held: Bool, +settings: Limits, s: Socket, sv: Sv, cont: Bool, previous: Maybe<&2, Phase>) -> IO((Socket & Turn) & Phase):
5684 do IO<(Socket & Turn) & Phase>:
5685 now : Time.Duration <- Time.mono()
5686 talk.recv.selected(inbox, held, settings, s, cont, phase.select(settings, sv, now, previous))
5687
5688type Serving is Type:
5689 Serving{connection: Socket & Turn, phase: Maybe<&2, Phase>}
5690
5691def talk.state(received: (Socket & Turn) & Phase) -> Serving:
5692 (connection, phase) = received
5693 Serving{connection, Some{phase}}
5694
5695def serve.write.state(after: Maybe<&1, Socket & Turn>) -> Maybe<&1, Serving>:
5696 match after:
5697 case None{}:
5698 None{}
5699 case Some{connection}:
5700 Some{Serving{connection, None{}}}
5701
5702# A buffered-work unit owns one connection's incomplete request, decoded body,
5703# and pipelined remainder from before its first recv until the task really returns.
5704# ponytail: idle sockets also reserve buffer units; split idle/read leases if idle utilization matters.
5705def admission.done(+inbox: Chan(Admission.Command), operation: IO(Unit)) -> IO(Unit):
5706 do IO<Unit>:
5707 operation
5708 Admission.give(inbox, 0)
5709
5710def admission.head(req: Req) -> Bool:
5711 Req{method, path, headers, body} = req
5712 String.eq(method, "HEAD")
5713
5714def admission.turn.head(turn: Turn) -> Bool:
5715 match turn:
5716 case TurnReq{req, rest, v11}:
5717 admission.head(req)
5718 case TurnMore{sv, cont}:
5719 match sv:
5720 case SvHead{buf}:
5721 False{}
5722 case SvLen{req, v11, left, parts}:
5723 admission.head(req)
5724 case SvChunk{req, v11, n, state, parts}:
5725 admission.head(req)
5726 case TurnFail{status}:
5727 False{}
5728 case TurnClose{}:
5729 False{}
5730 case TurnInputFailed{operation, code, message}:
5731 False{}
5732
5733# This rejection has parsed metadata, so normal HEAD body suppression still applies.
5734def admission.reject(observer: Completion.Receipt, s: Socket, head: Bool, ms: U32) -> IO(Unit):
5735 do IO<Unit>:
5736 now : Time.Duration <- Time.mono()
5737 sent : Socket & Result<&1, &1, U32 & String, Unit> <-
5738 bounded.send(s, reply.bytes(reply.fail.bytes(503), head, True{}), Time.Duration.add(now, Time.Duration.of_ms(ms)))
5739 reply.sent.observe(observer, 503, sent)
5740
5741def admission.request(
5742 ~C: Data, ~h: C -> Req -> IO(Reply), ~observe: C -> U32 -> Completion.Outcome -> IO(Unit),
5743 admitted: Bool, +inbox: Chan(Admission.Command), +context: C, +settings: Limits, s: Socket, req: Req, rest: Bytes.Bytes, v11: Bool
5744) -> IO(Maybe<&1, Socket & Turn>):
5745 match admitted:
5746 case False{}:
5747 Limits{max, cap, hm, bm, im, wm} = settings
5748 do IO<Maybe<&1, Socket & Turn>>:
5749 admission.reject(Completion.Observed{status => outcome => observe(context, status, outcome)}, s, admission.head(req), wm)
5750 return None{}
5751 case True{}:
5752 Req{+method, path, +headers, body} = req
5753 do IO<Maybe<&1, Socket & Turn>>:
5754 res : Reply <- h(context, Req{method, path, headers, body})
5755 next : Maybe<&1, Socket & Turn> <- talk.respond(Completion.Observed{status => outcome => observe(context, status, outcome)}, settings, s, rest, headers, v11, String.eq(method, "HEAD"), res)
5756 Admission.give(inbox, 1)
5757 return next
5758
5759
5760@unsafe
5761def talk(~C: Data, ~h: C -> Req -> IO(Reply), ~observe: C -> U32 -> Completion.Outcome -> IO(Unit), +context: C, +settings: Limits, +inbox: Chan(Admission.Command), st: Maybe<&1, Serving>) -> IO(Unit):
5762 Limits{max, cap, hm, bm, im, wm} = settings
5763 match st:
5764 case None{}:
5765 IO.pure(Unit, Unit{})
5766 case Some{Serving{(s, t), phase}}:
5767 match t:
5768 case TurnMore{sv, cont}:
5769 do IO<Unit>:
5770 received : (Socket & Turn) & Phase <- talk.recv(inbox, False{}, settings, s, sv, cont, phase)
5771 talk(~C, ~h, ~observe, context, settings, inbox, Some{talk.state(received)})
5772 case TurnReq{req, rest, v11}:
5773 do IO<Unit>:
5774 admitted : Bool <- Admission.take(inbox, 1)
5775 next : Maybe<&1, Socket & Turn> <- admission.request(~C, ~h, ~observe, admitted, inbox, context, settings, s, req, rest, v11)
5776 talk(~C, ~h, ~observe, context, settings, inbox, serve.write.state(next))
5777 case TurnFail{status}:
5778 reply_fail(Completion.Observed{status => outcome => observe(context, status, outcome)}, s, status, wm)
5779 case TurnClose{}:
5780 Socket.close(s)
5781 case TurnInputFailed{operation, code, message}:
5782 Socket.close(s)
5783
5784def conn.admitted(~h: Req -> IO(Reply), ~observe: U32 -> Completion.Outcome -> IO(Unit), admitted: Bool, +settings: Limits, +inbox: Chan(Admission.Command), l: Listener, s: Socket) -> IO(Listener):
5785 match admitted:
5786 case False{}:
5787 do IO<Listener>:
5788 Socket.close(s)
5789 return l
5790 case True{}:
5791 do IO<Listener>:
5792 IO.spawn(Unit, admission.done(inbox, talk(~Unit, ~(context => req => h(req)), ~(context => status => outcome => observe(status, outcome)), Unit{}, settings, inbox,
5793 Some{Serving{(s, TurnMore{sv.none(), False{}}), None{}}})))
5794 return l
5795
5796def conn(~h: Req -> IO(Reply), ~observe: U32 -> Completion.Outcome -> IO(Unit), +settings: Limits, +inbox: Chan(Admission.Command), m: Listener & Result<&1, &1, U32 & String, Socket>) -> IO(Listener):
5797 (l, r) = m
5798 do IO<Listener>:
5799 s : Socket <- IO.pass(Socket, r)
5800 admitted : Bool <- Admission.take(inbox, 0)
5801 conn.admitted(~h, ~observe, admitted, settings, inbox, l, s)
5802
5803# Finite positive settings, not zero/unlimited sentinels.
5804type StartupError is Data:
5805 InvalidConfig{}
5806 BindError{code: U32, message: String}
5807
5808# Application-owned affine dependencies never enter this transport owner.
5809type Server<-C: Data> is Type:
5810 Server{listener: Listener, context: C, config: ServerConfig, admission: Chan(Admission.Command), drained: Chan(Admission.Counts)}
5811
5812def server.config(host: String, port: U32) -> ServerConfig:
5813 ServerConfig{host, port, 16777216, 65536, 128, 128, 128, 5000, 30000, 30000, 30000}
5814
5815def server.config.with(host: String, port: U32, max: Nat) -> ServerConfig:
5816 ServerConfig{host, port, U32.from_nat(max), 65536, 128, 128, 128, 5000, 30000, 30000, 30000}
5817
5818# Host deadline effects use signed 32-bit milliseconds.
5819def server.deadline.valid(+ms: U32) -> Bool:
5820 U32.is_gt(ms, 0) && U32.is_le(ms, 2147483647)
5821
5822def server.config.valid(config: ServerConfig) -> Bool:
5823 ServerConfig{host, port, +body, +headers, connections, requests, buffered, header_ms, body_ms, idle_ms, write_ms} = config
5824 U32.is_le(port, 65535) && U32.is_gt(body, 0) && U32.is_le(body, limits.representable()) &&
5825 U32.is_gt(headers, 0) && U32.is_le(headers, limits.representable()) &&
5826 U32.is_gt(connections, 0) && U32.is_gt(requests, 0) && U32.is_gt(buffered, 0) &&
5827 server.deadline.valid(header_ms) && server.deadline.valid(body_ms) &&
5828 server.deadline.valid(idle_ms) && server.deadline.valid(write_ms)
5829
5830def server.opened(~C: Data, ~O: Type, owner: O, listener: Listener, context: C,
5831 config: ServerConfig, opened: Chan(Admission.Command) & Chan(Admission.Counts)) -> IO(O & Result<&2, &1, StartupError, Server<C>>):
5832 (inbox, drained) = opened
5833 IO.pure(O & Result<&2, &1, StartupError, Server<C>>, (owner, Done{Server{listener, context, config, inbox, drained}}))
5834
5835def server.started(~C: Data, ~O: Type, context: C, owner: O, +config: ServerConfig, result: Result<&1, &1, U32 & String, Listener>) -> IO(O & Result<&2, &1, StartupError, Server<C>>):
5836 ServerConfig{host, port, body, headers, connections, requests, buffered, hm, bm, im, wm} = config
5837 match result:
5838 case Fail{error}:
5839 (code, message) = error
5840 IO.pure(O & Result<&2, &1, StartupError, Server<C>>, (owner, Fail{BindError{code, message}}))
5841 case Done{listener}:
5842 do IO<O & Result<&2, &1, StartupError, Server<C>>>:
5843 opened : Chan(Admission.Command) & Chan(Admission.Counts) <- Admission.open.owner(Admission.Caps{connections, requests, buffered})
5844 server.opened(~C, ~O, owner, listener, context, config, opened)
5845
5846def server.start.valid(~C: Data, ~O: Type, valid: Bool, context: C, owner: O, +config: ServerConfig) -> IO(O & Result<&2, &1, StartupError, Server<C>>):
5847 match valid:
5848 case False{}:
5849 IO.pure(O & Result<&2, &1, StartupError, Server<C>>, (owner, Fail{InvalidConfig{}}))
5850 case True{}:
5851 ServerConfig{host, port, body, headers, connections, requests, buffered, header_ms, body_ms, idle_ms, write_ms} = config
5852 do IO<O & Result<&2, &1, StartupError, Server<C>>>:
5853 result : Result<&1, &1, U32 & String, Listener> <- TCP.listen(host, port)
5854 server.started(~C, ~O, context, owner, config, result)
5855
5856# Done is the readiness signal: TCP.listen has installed an accepting socket.
5857# Both branches return the preopened application owner unchanged.
5858def server.start(~C: Data, ~O: Type, context: C, owner: O, +config: ServerConfig) -> IO(O & Result<&2, &1, StartupError, Server<C>>):
5859 server.start.valid(~C, ~O, server.config.valid(config), context, owner, config)
5860
5861
5862# Copyable read-only observations remain usable while server.run owns the listener.
5863type ServerStats is Data:
5864 ServerStats{inbox: Chan(Admission.Command)}
5865
5866type ServerCounts is Data:
5867 ServerCounts{connections: U32, active: U32, buffered: U32,
5868 connection_high: U32, active_high: U32, buffered_high: U32,
5869 connection_rejected: Nat, active_rejected: Nat, buffered_rejected: Nat}
5870
5871def server.observer(~C: Data, server: Server<C>) -> Server<C> & ServerStats:
5872 Server{listener, context, config, +inbox, drained} = server
5873 (Server{listener, context, config, inbox, drained}, ServerStats{inbox})
5874
5875def server.counts(counts: Maybe<&2, Admission.Counts>) -> Maybe<&2, ServerCounts>:
5876 match counts:
5877 case None{}:
5878 None{}
5879 case Some{Admission.Counts{c, a, b, ch, ah, bh, cr, ar, br}}:
5880 Some{ServerCounts{c, a, b, ch, ah, bh, cr, ar, br}}
5881
5882# None means accounting has closed after the listener and its retained operations.
5883# This is not a drain result or a per-response write outcome.
5884def server.stats(observer: ServerStats) -> IO(Maybe<&2, ServerCounts>):
5885 ServerStats{inbox} = observer
5886 do IO<Maybe<&2, ServerCounts>>:
5887 counts : Maybe<&2, Admission.Counts> <- Admission.snapshot(inbox)
5888 return server.counts(counts)
5889
5890type ServerControl is Data:
5891 ServerControl{inbox: Chan(Admission.Command)}
5892
5893# Stop linearizes in Admission. It requests quiescence, never attests drain.
5894def server.control(~C: Data, server: Server<C>) -> Server<C> & ServerControl:
5895 Server{listener, context, config, +inbox, drained} = server
5896 (Server{listener, context, config, inbox, drained}, ServerControl{inbox})
5897
5898def server.stop(control: ServerControl) -> IO(Bool):
5899 ServerControl{inbox} = control
5900 Admission.quiesce(inbox)
5901
5902def server.final.counts(counts: Admission.Counts) -> ServerCounts:
5903 Admission.Counts{c, a, b, ch, ah, bh, cr, ar, br} = counts
5904 ServerCounts{c, a, b, ch, ah, bh, cr, ar, br}
5905
5906# Only the listener owner closes it, after the current accept really returns.
5907# Joining the controller waits for every real operation, including callbacks.
5908def server.close(~C: Data, server: Server<C>) -> IO(ServerCounts):
5909 Server{listener, context, config, +inbox, drained} = server
5910 do IO<ServerCounts>:
5911 requested : Bool <- Admission.quiesce(inbox)
5912 Listener.close(listener)
5913 Admission.close(inbox)
5914 counts : Admission.Counts <- IO.join(Admission.Counts, drained)
5915 return server.final.counts(counts)
5916
5917type ServerExit is Data:
5918 ServerStopped{counts: ServerCounts}
5919 ServerAcceptFailed{code: U32, message: String, counts: ServerCounts}
5920
5921def server.finished(stopped: Bool, error: U32 & String, counts: ServerCounts) -> ServerExit:
5922 match stopped:
5923 case True{}:
5924 ServerStopped{counts}
5925 case False{}:
5926 (code, message) = error
5927 ServerAcceptFailed{code, message, counts}
5928
5929def server.finish(~C: Data, stopped: Bool, error: U32 & String, server: Server<C>) -> IO(ServerExit):
5930 do IO<ServerExit>:
5931 counts : ServerCounts <- server.close(~C, server)
5932 return server.finished(stopped, error, counts)
5933
5934def server.admitted(~C: Data, ~operation: C -> Limits -> Chan(Admission.Command) -> Socket -> IO(Unit), admitted: Bool, +context: C, +config: ServerConfig, +inbox: Chan(Admission.Command), drained: Chan(Admission.Counts), listener: Listener, socket: Socket) -> IO(Server<C> & Result<&1, &1, U32 & String, Chan(Unit)>):
5935 match admitted:
5936 case False{}:
5937 do IO<Server<C> & Result<&1, &1, U32 & String, Chan(Unit)>>:
5938 Socket.close(socket)
5939 return (Server{listener, context, config, inbox, drained}, Fail{(11, "transport capacity exhausted")})
5940 case True{}:
5941 do IO<Server<C> & Result<&1, &1, U32 & String, Chan(Unit)>>:
5942 finished : Chan(Unit) <- IO.fork(Unit, admission.done(inbox, operation(context, limits.config(config), inbox, socket)))
5943 return (Server{listener, context, config, inbox, drained}, Done{finished})
5944
5945def server.accepted(~C: Data, ~operation: C -> Limits -> Chan(Admission.Command) -> Socket -> IO(Unit), +context: C, +config: ServerConfig, +inbox: Chan(Admission.Command), drained: Chan(Admission.Counts), result: Listener & Result<&1, &1, U32 & String, Socket>) -> IO(Server<C> & Result<&1, &1, U32 & String, Chan(Unit)>):
5946 (listener, got) = result
5947 match got:
5948 case Fail{error}:
5949 IO.pure(Server<C> & Result<&1, &1, U32 & String, Chan(Unit)>, (Server{listener, context, config, inbox, drained}, Fail{error}))
5950 case Done{socket}:
5951 do IO<Server<C> & Result<&1, &1, U32 & String, Chan(Unit)>>:
5952 admitted : Bool <- Admission.take(inbox, 0)
5953 server.admitted(~C, ~operation, admitted, context, config, inbox, drained, listener, socket)
5954
5955# One accepting step, so the caller retains explicit listener ownership.
5956type AcceptStep<-C: Data> is Type:
5957 AcceptChecking{server: Server<C>}
5958 AcceptAllowed{running: Bool, server: Server<C>}
5959 AcceptReceived{result: Server<C> & Result<&1, &1, U32 & String, Chan(Unit)>}
5960 AcceptFailed{retry: Bool, server: Server<C>, error: U32 & String}
5961
5962@unsafe
5963def server.accept.loop(~C: Data, ~operation: C -> Limits -> Chan(Admission.Command) -> Socket -> IO(Unit),
5964 step: AcceptStep<C>) -> IO(Server<C> & Result<&1, &1, U32 & String, Chan(Unit)>):
5965 match step:
5966 case AcceptChecking{server}:
5967 Server{listener, context, config, +inbox, drained} = server
5968 do IO<Server<C> & Result<&1, &1, U32 & String, Chan(Unit)>>:
5969 running : Bool <- Admission.running(inbox)
5970 server.accept.loop(~C, ~operation, AcceptAllowed{running, Server{listener, context, config, inbox, drained}})
5971 case AcceptAllowed{running, server}:
5972 match running:
5973 case False{}:
5974 IO.pure(Server<C> & Result<&1, &1, U32 & String, Chan(Unit)>, (server, Fail{(0, "server stopped")}))
5975 case True{}:
5976 Server{listener, context, config, inbox, drained} = server
5977 do IO<Server<C> & Result<&1, &1, U32 & String, Chan(Unit)>>:
5978 result : Listener & Result<&1, &1, U32 & String, Socket> <- Wire.accept.deadline(listener, 50)
5979 accepted : Server<C> & Result<&1, &1, U32 & String, Chan(Unit)> <-
5980 server.accepted(~C, ~operation, context, config, inbox, drained, result)
5981 server.accept.loop(~C, ~operation, AcceptReceived{accepted})
5982 case AcceptReceived{accepted}:
5983 (server, result) = accepted
5984 match result:
5985 case Fail{(+code, message)}:
5986 server.accept.loop(~C, ~operation, AcceptFailed{err.late(code), server, (code, message)})
5987 case Done{finished}:
5988 IO.pure(Server<C> & Result<&1, &1, U32 & String, Chan(Unit)>, (server, Done{finished}))
5989 case AcceptFailed{retry, server, error}:
5990 match retry:
5991 case True{}: server.accept.loop(~C, ~operation, AcceptChecking{server})
5992 case False{}: IO.pure(Server<C> & Result<&1, &1, U32 & String, Chan(Unit)>, (server, Fail{error}))
5993
5994def server.accept.operation(~C: Data, ~operation: C -> Limits -> Chan(Admission.Command) -> Socket -> IO(Unit),
5995 server: Server<C>) -> IO(Server<C> & Result<&1, &1, U32 & String, Chan(Unit)>):
5996 server.accept.loop(~C, ~operation, AcceptChecking{server})
5997
5998def server.accept(~C: Data, ~h: C -> Req -> IO(Reply), ~observe: C -> U32 -> Completion.Outcome -> IO(Unit), server: Server<C>) -> IO(Server<C> & Result<&1, &1, U32 & String, Chan(Unit)>):
5999 server.accept.operation(~C,
6000 ~(context => settings => inbox => socket => talk(~C, ~h, ~observe, context, settings, inbox,
6001 Some{Serving{(socket, TurnMore{sv.none(), False{}}), None{}}})), server)
6002
6003def error.stopped(error: U32 & String) -> Bool:
6004 (code, message) = error
6005 U32.is_zero(code) && String.eq(message, "server stopped")
6006
6007type ServerLoop<-C: Data> is Type:
6008 ServerListening{server: Server<C>}
6009 ServerAccepted{result: Server<C> & Result<&1, &1, U32 & String, Chan(Unit)>}
6010 ServerFailed{retry: Bool, server: Server<C>, error: U32 & String}
6011
6012def error.capacity(error: U32 & String) -> Bool:
6013 (code, message) = error
6014 U32.is_eq(code, 11) && String.eq(message, "transport capacity exhausted")
6015
6016
6017# A single recursive state machine avoids recursion hidden inside a template.
6018@unsafe
6019def server.run.loop(~C: Data, ~operation: C -> Limits -> Chan(Admission.Command) -> Socket -> IO(Unit), step: ServerLoop<C>) -> IO(ServerExit):
6020 match step:
6021 case ServerListening{server}:
6022 do IO<ServerExit>:
6023 result : Server<C> & Result<&1, &1, U32 & String, Chan(Unit)> <- server.accept.operation(~C, ~operation, server)
6024 server.run.loop(~C, ~operation, ServerAccepted{result})
6025 case ServerAccepted{accepted}:
6026 (server, result) = accepted
6027 match result:
6028 case Fail{+error}:
6029 server.run.loop(~C, ~operation, ServerFailed{error.capacity(error), server, error})
6030 case Done{finished}:
6031 do IO<ServerExit>:
6032 Chan.close(Unit, finished)
6033 server.run.loop(~C, ~operation, ServerListening{server})
6034 case ServerFailed{retry, server, +error}:
6035 match retry:
6036 case True{}:
6037 server.run.loop(~C, ~operation, ServerListening{server})
6038 case False{}:
6039 server.finish(~C, error.stopped(error), error, server)
6040
6041def server.run(~C: Data, ~h: C -> Req -> IO(Reply), ~observe: C -> U32 -> Completion.Outcome -> IO(Unit), server: Server<C>) -> IO(ServerExit):
6042 server.run.loop(~C,
6043 ~(context => settings => inbox => socket => talk(~C, ~h, ~observe, context, settings, inbox,
6044 Some{Serving{(socket, TurnMore{sv.none(), False{}}), None{}}})), ServerListening{server})
6045
6046# Convenience wrappers use the same owner and observe its actual exit/drain.
6047def server.exited(result: ServerExit) -> IO(Unit):
6048 match result:
6049 case ServerStopped{counts}: IO.pure(Unit, Unit{})
6050 case ServerAcceptFailed{code, message, counts}: IO.die(Unit, code, message)
6051
6052def server.start.failed(error: StartupError) -> IO(Unit):
6053 match error:
6054 case InvalidConfig{}: IO.die(Unit, 22, "invalid server configuration")
6055 case BindError{code, message}: IO.die(Unit, code, message)
6056
6057def serve.config.result(result: Result<&2, &2, StartupError, Unit>) -> IO(Unit):
6058 match result:
6059 case Fail{error}: server.start.failed(error)
6060 case Done{unit}: IO.pure(Unit, unit)
6061
6062def serve.stream.nonempty(~S: Type, ~piece: S -> Bytes.Bytes -> IO(S & Bool), empty: Bool, state: S, b: Bytes.Bytes) -> IO(S & Bool):
6063 match empty:
6064 case True{}:
6065 IO.pure(S & Bool, (state, False{}))
6066 case False{}:
6067 piece(state, b)
6068
6069# The piece callback returns True to discard the rest of this request body.
6070def serve.stream.one(~S: Type, ~piece: S -> Bytes.Bytes -> IO(S & Bool), drop: Bool, state: S, b: Bytes.Bytes) -> IO(S & Bool):
6071 match drop:
6072 case True{}:
6073 IO.pure(S & Bool, (state, True{}))
6074 case False{}:
6075 Bytes.Bytes{+len, buf} = b
6076 serve.stream.nonempty(~S, ~piece, U32.is_eq(len, 0), state, Bytes.Bytes{len, buf})
6077
6078def serve.stream.parts(~S: Type, ~piece: S -> Bytes.Bytes -> IO(S & Bool), xs: List<&1, Bytes.Bytes>, st: S & Bool) -> IO(S & Bool):
6079 match xs:
6080 case Nil{}:
6081 IO.pure(S & Bool, st)
6082 case Con{b, rest}:
6083 (state, drop) = st
6084 do IO<S & Bool>:
6085 next : S & Bool <- serve.stream.one(~S, ~piece, drop, state, b)
6086 serve.stream.parts(~S, ~piece, rest, next)
6087
6088def serve.stream.feed(~S: Type, ~start: Req -> IO(S), ~piece: S -> Bytes.Bytes -> IO(S & Bool), req: Req, m: Maybe<&1, S & Bool>, parts: List<&1, Bytes.Bytes>) -> IO(S & Bool):
6089 match m:
6090 case None{}:
6091 do IO<S & Bool>:
6092 state : S <- start(req)
6093 serve.stream.parts(~S, ~piece, parts, (state, False{}))
6094 case Some{st}:
6095 serve.stream.parts(~S, ~piece, parts, st)
6096
6097def serve.stream.respond(~S: Type, ~finish: S -> IO(Reply), ~observe: U32 -> Completion.Outcome -> IO(Unit), +settings: Limits, s: Socket, rest: Bytes.Bytes, +headers: Map<&2, List<&2, String>>, v11: Bool, +method: String, st: S & Bool) -> IO(Maybe<&1, Socket & Turn>):
6098 (state, dropped) = st
6099 do IO<Maybe<&1, Socket & Turn>>:
6100 res : Reply <- finish(state)
6101 talk.respond(Completion.Observed{status => outcome => observe(status, outcome)}, settings, s, rest, headers, v11, String.eq(method, "HEAD"), res)
6102
6103def admission.ready(t: Turn) -> Bool & Turn:
6104 match t:
6105 case TurnReq{req, rest, v11}:
6106 (True{}, TurnReq{req, rest, v11})
6107 case TurnMore{sv, cont}:
6108 match sv:
6109 case SvHead{buf}:
6110 (False{}, TurnMore{SvHead{buf}, cont})
6111 case SvLen{req, v11, left, parts}:
6112 (True{}, TurnMore{SvLen{req, v11, left, parts}, cont})
6113 case SvChunk{req, v11, n, state, parts}:
6114 (True{}, TurnMore{SvChunk{req, v11, n, state, parts}, cont})
6115 case TurnFail{status}:
6116 (False{}, TurnFail{status})
6117 case TurnClose{}:
6118 (False{}, TurnClose{})
6119 case TurnInputFailed{operation, code, message}:
6120 (False{}, TurnInputFailed{operation, code, message})
6121
6122def admission.give.held(held: Bool, inbox: Chan(Admission.Command)) -> IO(Unit):
6123 match held:
6124 case False{}:
6125 IO.pure(Unit, Unit{})
6126 case True{}:
6127 Admission.give(inbox, 1)
6128
6129type StreamServing<-S: Type> is Type:
6130 StreamCheck{held: Bool, connection: Serving, state: Maybe<&1, S & Bool>}
6131 StreamReady{held: Bool, ready: Bool, connection: Serving, state: Maybe<&1, S & Bool>}
6132 StreamChecked{held: Bool, admitted: Bool, connection: Serving, state: Maybe<&1, S & Bool>}
6133 StreamDone{}
6134
6135def serve.stream.after(~S: Type, next: Maybe<&1, Socket & Turn>) -> StreamServing<S>:
6136 match next:
6137 case None{}:
6138 StreamDone{}
6139 case Some{connection}:
6140 StreamCheck{False{}, Serving{connection, None{}}, None{}}
6141
6142def serve.stream.ready(~S: Type, held: Bool, socket: Socket, phase: Maybe<&2, Phase>,
6143 state: Maybe<&1, S & Bool>, result: Bool & Turn) -> StreamServing<S>:
6144 (ready, turn) = result
6145 StreamReady{held, ready, Serving{(socket, turn), phase}, state}
6146
6147def admission.stream.take(needed: Bool, inbox: Chan(Admission.Command)) -> IO(Bool):
6148 match needed:
6149 case False{}:
6150 IO.pure(Bool, True{})
6151 case True{}:
6152 Admission.take(inbox, 1)
6153
6154type StreamAbort is Data:
6155 StreamClosed{}
6156 StreamFailed{status: U32}
6157 StreamInputFailed{operation: InputOperation, code: U32, message: String}
6158
6159# The application consumes its real affine state on unsuccessful upload paths.
6160# An abort that does not return remains admitted work, not a fabricated drain.
6161def serve.stream.abort(~S: Type, ~abort: S -> StreamAbort -> IO(Unit),
6162 reason: StreamAbort, state: Maybe<&1, S & Bool>) -> IO(Unit):
6163 match state:
6164 case None{}: IO.pure(Unit, Unit{})
6165 case Some{pair}:
6166 (value, dropped) = pair
6167 abort(value, reason)
6168
6169# One recursive state machine keeps template callbacks out of mutual recursion.
6170@unsafe
6171def serve.stream.talk(
6172 ~S: Type, ~start: Req -> IO(S), ~piece: S -> Bytes.Bytes -> IO(S & Bool),
6173 ~finish: S -> IO(Reply), ~abort: S -> StreamAbort -> IO(Unit), ~observe: U32 -> Completion.Outcome -> IO(Unit), +settings: Limits, +inbox: Chan(Admission.Command), step: StreamServing<S>
6174) -> IO(Unit):
6175 Limits{max, cap, hm, bm, im, wm} = settings
6176 match step:
6177 case StreamDone{}:
6178 IO.pure(Unit, Unit{})
6179 case StreamCheck{held, connection, state}:
6180 Serving{(socket, turn), phase} = connection
6181 serve.stream.talk(~S, ~start, ~piece, ~finish, ~abort, ~observe, settings, inbox,
6182 serve.stream.ready(~S, held, socket, phase, state, admission.ready(turn)))
6183 case StreamReady{+held, +ready, connection, state}:
6184 do IO<Unit>:
6185 admitted : Bool <- admission.stream.take(Bool.not(held) && ready, inbox)
6186 serve.stream.talk(~S, ~start, ~piece, ~finish, ~abort, ~observe, settings, inbox,
6187 StreamChecked{held || ready, admitted, connection, state})
6188 case StreamChecked{+held, admitted, connection, m}:
6189 match admitted:
6190 case False{}:
6191 Serving{(socket, turn), phase} = connection
6192 do IO<Unit>:
6193 serve.stream.abort(~S, ~abort, StreamFailed{503}, m)
6194 admission.reject(Completion.Observed{status => outcome => observe(status, outcome)}, socket, admission.turn.head(turn), wm)
6195 case True{}:
6196 Serving{(s, t), phase} = connection
6197 match t:
6198 case TurnClose{}:
6199 do IO<Unit>:
6200 Socket.close(s)
6201 serve.stream.abort(~S, ~abort, StreamClosed{}, m)
6202 admission.give.held(held, inbox)
6203 case TurnInputFailed{operation, code, message}:
6204 do IO<Unit>:
6205 Socket.close(s)
6206 serve.stream.abort(~S, ~abort, StreamInputFailed{operation, code, message}, m)
6207 admission.give.held(held, inbox)
6208 case TurnFail{+status}:
6209 do IO<Unit>:
6210 serve.stream.abort(~S, ~abort, StreamFailed{status}, m)
6211 reply_fail(Completion.Observed{status => outcome => observe(status, outcome)}, s, status, wm)
6212 admission.give.held(held, inbox)
6213 case TurnReq{req, rest, v11}:
6214 Req{+method, path, +headers, body} = req
6215 do IO<Unit>:
6216 next : S & Bool <- serve.stream.feed(~S, ~start, ~piece,
6217 Req{method, path, headers, Bytes.new(0)}, m, [body])
6218 after : Maybe<&1, Socket & Turn> <- serve.stream.respond(~S, ~finish, ~observe, settings, s, rest, headers, v11, method, next)
6219 Admission.give(inbox, 1)
6220 serve.stream.talk(~S, ~start, ~piece, ~finish, ~abort, ~observe, settings, inbox,
6221 serve.stream.after(~S, after))
6222 case TurnMore{sv, cont}:
6223 match sv:
6224 case SvHead{buf}:
6225 do IO<Unit>:
6226 received : (Socket & Turn) & Phase <- talk.recv(inbox, held, settings, s, SvHead{buf}, cont, phase)
6227 serve.stream.talk(~S, ~start, ~piece, ~finish, ~abort, ~observe, settings, inbox,
6228 StreamCheck{held, talk.state(received), m})
6229 case SvLen{req, +v11, +left, parts}:
6230 Req{+method, +path, +headers, body} = req
6231 do IO<Unit>:
6232 now : Time.Duration <- Time.mono()
6233 reading : Phase = phase.body(phase, settings, now)
6234 next : S & Bool <- serve.stream.feed(~S, ~start, ~piece,
6235 Req{method, path, headers, body}, m, List.reverse(&1, Bytes.Bytes, parts))
6236 received : (Socket & Turn) & Phase <- talk.recv(inbox, held, settings, s,
6237 SvLen{Req{method, path, headers, Bytes.new(0)}, v11, left, Nil{}}, cont, Some{reading})
6238 serve.stream.talk(~S, ~start, ~piece, ~finish, ~abort, ~observe, settings, inbox,
6239 StreamCheck{held, talk.state(received), Some{next}})
6240 case SvChunk{req, +v11, +n, st, parts}:
6241 Req{+method, +path, +headers, body} = req
6242 do IO<Unit>:
6243 now : Time.Duration <- Time.mono()
6244 reading : Phase = phase.body(phase, settings, now)
6245 next : S & Bool <- serve.stream.feed(~S, ~start, ~piece,
6246 Req{method, path, headers, body}, m, List.reverse(&1, Bytes.Bytes, parts))
6247 received : (Socket & Turn) & Phase <- talk.recv(inbox, held, settings, s,
6248 SvChunk{Req{method, path, headers, Bytes.new(0)}, v11, n, st, Nil{}}, cont, Some{reading})
6249 serve.stream.talk(~S, ~start, ~piece, ~finish, ~abort, ~observe, settings, inbox,
6250 StreamCheck{held, talk.state(received), Some{next}})
6251
6252
6253def server.stream.run(
6254 ~S: Type, ~start: Req -> IO(S), ~piece: S -> Bytes.Bytes -> IO(S & Bool),
6255 ~finish: S -> IO(Reply), ~abort: S -> StreamAbort -> IO(Unit), ~observe: U32 -> Completion.Outcome -> IO(Unit), server: Server<Unit>
6256) -> IO(ServerExit):
6257 server.run.loop(~Unit,
6258 ~(context => settings => inbox => socket =>
6259 serve.stream.talk(~S, ~start, ~piece, ~finish, ~abort, ~observe, settings, inbox,
6260 StreamCheck{False{}, Serving{(socket, TurnMore{sv.none(), False{}}), None{}}, None{}})),
6261 ServerListening{server})
6262
6263def serve.stream.started(
6264 ~S: Type, ~start: Req -> IO(S), ~piece: S -> Bytes.Bytes -> IO(S & Bool), ~finish: S -> IO(Reply), ~abort: S -> StreamAbort -> IO(Unit), ~observe: U32 -> Completion.Outcome -> IO(Unit),
6265 result: Unit & Result<&2, &1, StartupError, Server<Unit>>
6266) -> IO(Result<&2, &2, StartupError, Unit>):
6267 (owner, got) = result
6268 match got:
6269 case Fail{error}:
6270 IO.pure(Result<&2, &2, StartupError, Unit>, Fail{error})
6271 case Done{server}:
6272 do IO<Result<&2, &2, StartupError, Unit>>:
6273 exited : ServerExit <- server.stream.run(~S, ~start, ~piece, ~finish, ~abort, ~observe, server)
6274 server.exited(exited)
6275 return Done{Unit{}}
6276
6277def serve.stream.config(
6278 ~S: Type, ~start: Req -> IO(S), ~piece: S -> Bytes.Bytes -> IO(S & Bool), ~finish: S -> IO(Reply), ~abort: S -> StreamAbort -> IO(Unit), ~observe: U32 -> Completion.Outcome -> IO(Unit),
6279 config: ServerConfig
6280) -> IO(Result<&2, &2, StartupError, Unit>):
6281 do IO<Result<&2, &2, StartupError, Unit>>:
6282 started : Unit & Result<&2, &1, StartupError, Server<Unit>> <- server.start(~Unit, ~Unit, Unit{}, Unit{}, config)
6283 serve.stream.started(~S, ~start, ~piece, ~finish, ~abort, ~observe, started)
6284
6285type WriterMode is Data:
6286 WriteKnown{left: U32}
6287 WriteChunk{}
6288 WriteNone{}
6289
6290type Writer is Type:
6291 Writer{s: Maybe<&1, Socket>, mode: WriterMode, until: Time.Duration, outcome: Completion.Outcome}
6292
6293type WriteHead<-S: Type> is Type:
6294 WriteHead{status: U32, headers: Map<&2, List<&2, String>>, length: Maybe<&2, U32>, state: S, receipt: Completion.Receipt}
6295
6296def writer.sent(+mode: WriterMode, +until: Time.Duration, m: Socket & Result<&1, &1, U32 & String, Unit>) -> IO(Writer):
6297 (s, r) = m
6298 match r:
6299 case Fail{(code, message)}:
6300 do IO<Writer>:
6301 Socket.close(s)
6302 return Writer{None{}, mode, until, Completion.WriteFailed{code, message}}
6303 case Done{u}:
6304 IO.pure(Writer, Writer{Some{s}, mode, until, Completion.HostAccepted{}})
6305
6306def writer.raw(w: Writer, b: Bytes.Bytes) -> IO(Writer):
6307 Writer{socket, +mode, +until, outcome} = w
6308 match socket:
6309 case None{}:
6310 IO.pure(Writer, Writer{None{}, mode, until, outcome})
6311 case Some{s}:
6312 do IO<Writer>:
6313 sent : Socket & Result<&1, &1, U32 & String, Unit> <- bounded.send(s, b, until)
6314 writer.sent(mode, until, sent)
6315
6316def writer.chunk(s: Socket, b: Bytes.Bytes, +len: U32, until: Time.Duration) -> IO(Writer):
6317 do IO<Writer>:
6318 head : Writer <- writer.raw(Writer{Some{s}, WriteChunk{}, until, Completion.HostAccepted{}}, Bytes.from_string(hex(len) ++ "\r\n"))
6319 data : Writer <- writer.raw(head, b)
6320 writer.raw(data, Bytes.from_string("\r\n"))
6321
6322def writer.known(ok: Bool, s: Socket, +left: U32, len: U32, b: Bytes.Bytes, +until: Time.Duration) -> IO(Writer):
6323 match ok:
6324 case False{}:
6325 do IO<Writer>:
6326 Socket.close(s)
6327 return Writer{None{}, WriteKnown{left}, until, Completion.IncompleteResponse{}}
6328 case True{}:
6329 writer.raw(Writer{Some{s}, WriteKnown{(left - len : U32)}, until, Completion.HostAccepted{}}, b)
6330
6331def writer.chunk.go(empty: Bool, s: Socket, b: Bytes.Bytes, len: U32, until: Time.Duration) -> IO(Writer):
6332 match empty:
6333 case True{}:
6334 IO.pure(Writer, Writer{Some{s}, WriteChunk{}, until, Completion.HostAccepted{}})
6335 case False{}:
6336 writer.chunk(s, b, len, until)
6337
6338def writer.write.mode(s: Socket, mode: WriterMode, b: Bytes.Bytes, until: Time.Duration) -> IO(Writer):
6339 match mode:
6340 case WriteNone{}:
6341 IO.pure(Writer, Writer{Some{s}, WriteNone{}, until, Completion.HostAccepted{}})
6342 case WriteKnown{+left}:
6343 Bytes.Bytes{+len, buf} = b
6344 writer.known(U32.is_le(len, left), s, left, len, Bytes.Bytes{len, buf}, until)
6345 case WriteChunk{}:
6346 Bytes.Bytes{+len, buf} = b
6347 writer.chunk.go(U32.is_zero(len), s, Bytes.Bytes{len, buf}, len, until)
6348
6349def writer.write(w: Writer, b: Bytes.Bytes) -> IO(Writer):
6350 Writer{socket, mode, until, outcome} = w
6351 match socket:
6352 case None{}:
6353 IO.pure(Writer, Writer{None{}, mode, until, outcome})
6354 case Some{s}:
6355 writer.write.mode(s, mode, b, until)
6356
6357def writer.result(w: Writer) -> Maybe<&1, Socket> & Completion.Outcome:
6358 Writer{socket, mode, until, outcome} = w
6359 (socket, outcome)
6360
6361def writer.finish.known(complete: Bool, s: Socket) -> IO(Maybe<&1, Socket> & Completion.Outcome):
6362 match complete:
6363 case True{}:
6364 IO.pure(Maybe<&1, Socket> & Completion.Outcome, (Some{s}, Completion.HostAccepted{}))
6365 case False{}:
6366 do IO<Maybe<&1, Socket> & Completion.Outcome>:
6367 Socket.close(s)
6368 return (None{}, Completion.IncompleteResponse{})
6369
6370def writer.finish.mode(s: Socket, mode: WriterMode, until: Time.Duration) -> IO(Maybe<&1, Socket> & Completion.Outcome):
6371 match mode:
6372 case WriteNone{}:
6373 IO.pure(Maybe<&1, Socket> & Completion.Outcome, (Some{s}, Completion.HostAccepted{}))
6374 case WriteKnown{left}:
6375 writer.finish.known(U32.is_zero(left), s)
6376 case WriteChunk{}:
6377 do IO<Maybe<&1, Socket> & Completion.Outcome>:
6378 end : Writer <- writer.raw(Writer{Some{s}, WriteChunk{}, until, Completion.HostAccepted{}}, Bytes.from_string("0\r\n\r\n"))
6379 return writer.result(end)
6380
6381def writer.finish(w: Writer) -> IO(Maybe<&1, Socket> & Completion.Outcome):
6382 Writer{socket, mode, until, outcome} = w
6383 match socket:
6384 case None{}:
6385 IO.pure(Maybe<&1, Socket> & Completion.Outcome, (None{}, outcome))
6386 case Some{s}:
6387 writer.finish.mode(s, mode, until)
6388
6389def writer.header.one(m: Map<&2, List<&2, String>>, +key: String, vs: List<&2, String>, framing: Bool) -> Map<&2, List<&2, String>>:
6390 match framing:
6391 case True{}:
6392 m
6393 case False{}:
6394 Map.set(&2, List<&2, String>, m, key, vs)
6395
6396def writer.headers(xs: List<&2, Sigma<&2, &2, String, _ => List<&2, String>>>, m: Map<&2, List<&2, String>>) -> Map<&2, List<&2, String>>:
6397 match xs:
6398 case Nil{}:
6399 m
6400 case (k, vs) <> rest:
6401 +key = String.to_lower(k)
6402 +framing = Bool.or(String.eq(key, "content-length"), String.eq(key, "transfer-encoding"))
6403 writer.headers(rest, writer.header.one(m, key, vs, framing))
6404
6405def writer.plan.body(headers: Map<&2, List<&2, String>>, length: Maybe<&2, U32>) -> WriterMode & Map<&2, List<&2, String>>:
6406 match length:
6407 case Some{+n}:
6408 (WriteKnown{n}, set(headers, "content-length", U32.show(n)))
6409 case None{}:
6410 (WriteChunk{}, set(headers, "transfer-encoding", "chunked"))
6411
6412def writer.plan(nobody: Bool, headers: Map<&2, List<&2, String>>, length: Maybe<&2, U32>) -> WriterMode & Map<&2, List<&2, String>>:
6413 match nobody:
6414 case True{}:
6415 (WriteNone{}, headers)
6416 case False{}:
6417 writer.plan.body(headers, length)
6418
6419def serve.write.after(settings: Limits, keep: Bool, rest: Bytes.Bytes, socket: Maybe<&1, Socket>) -> Maybe<&1, Socket & Turn>:
6420 match socket:
6421 case None{}:
6422 None{}
6423 case Some{s}:
6424 Some{talk.after.keep(keep, settings, rest, s)}
6425
6426def serve.write.completed(observer: Completion.Receipt, receipt: Completion.Receipt, +status: U32,
6427 settings: Limits, keep: Bool, rest: Bytes.Bytes, result: Maybe<&1, Socket> & Completion.Outcome) -> IO(Maybe<&1, Socket & Turn>):
6428 (socket, outcome) = result
6429 +observed = {outcome : Completion.Outcome}
6430 do IO<Maybe<&1, Socket & Turn>>:
6431 Completion.report(observer, status, observed)
6432 Completion.report(receipt, status, observed)
6433 return serve.write.after(settings, keep, rest, socket)
6434
6435def serve.write.returned(observer: Completion.Receipt, status: U32, settings: Limits, keep: Bool,
6436 rest: Bytes.Bytes, result: Writer & Completion.Receipt) -> IO(Maybe<&1, Socket & Turn>):
6437 (writer, receipt) = result
6438 do IO<Maybe<&1, Socket & Turn>>:
6439 done : Maybe<&1, Socket> & Completion.Outcome <- writer.finish(writer)
6440 serve.write.completed(observer, receipt, status, settings, keep, rest, done)
6441
6442def serve.write.finish(observer: Completion.Receipt, receipt: Completion.Receipt, status: U32,
6443 settings: Limits, keep: Bool, rest: Bytes.Bytes, w: Writer) -> IO(Maybe<&1, Socket & Turn>):
6444 serve.write.returned(observer, status, settings, keep, rest, (w, receipt))
6445
6446def serve.write.body(~S: Type, ~write: S -> Writer -> Completion.Receipt -> IO(Writer & Completion.Receipt), ~dispose: S -> IO(Unit),
6447 observer: Completion.Receipt, receipt: Completion.Receipt, status: U32, settings: Limits,
6448 keep: Bool, rest: Bytes.Bytes, state: S, s: Socket, mode: WriterMode, suppress: Bool, until: Time.Duration) -> IO(Maybe<&1, Socket & Turn>):
6449 match suppress:
6450 case True{}:
6451 do IO<Maybe<&1, Socket & Turn>>:
6452 dispose(state)
6453 serve.write.finish(observer, receipt, status, settings, keep, rest, Writer{Some{s}, WriteNone{}, until, Completion.HostAccepted{}})
6454 case False{}:
6455 do IO<Maybe<&1, Socket & Turn>>:
6456 result : Writer & Completion.Receipt <- write(state, Writer{Some{s}, mode, until, Completion.HostAccepted{}}, receipt)
6457 serve.write.returned(observer, status, settings, keep, rest, result)
6458
6459def serve.write.open(~S: Type, ~write: S -> Writer -> Completion.Receipt -> IO(Writer & Completion.Receipt), ~dispose: S -> IO(Unit),
6460 observer: Completion.Receipt, receipt: Completion.Receipt, +status: U32, settings: Limits,
6461 keep: Bool, rest: Bytes.Bytes, state: S, mode: WriterMode, suppress: Bool, until: Time.Duration,
6462 m: Socket & Result<&1, &1, U32 & String, Unit>) -> IO(Maybe<&1, Socket & Turn>):
6463 (s, r) = m
6464 match r:
6465 case Fail{(code, message)}:
6466 +failure = {Completion.WriteFailed{code, message} : Completion.Outcome}
6467 do IO<Maybe<&1, Socket & Turn>>:
6468 Socket.close(s)
6469 dispose(state)
6470 Completion.report(observer, status, failure)
6471 Completion.report(receipt, status, failure)
6472 return None{}
6473 case Done{u}:
6474 serve.write.body(~S, ~write, ~dispose, observer, receipt, status, settings, keep, rest, state, s, mode, suppress, until)
6475
6476def writer.connection(keep: Bool, headers: Map<&2, List<&2, String>>) -> Map<&2, List<&2, String>>:
6477 match keep:
6478 case True{}:
6479 headers
6480 case False{}:
6481 set(headers, "connection", "close")
6482
6483def serve.write.send.plan(
6484 ~S: Type, ~write: S -> Writer -> Completion.Receipt -> IO(Writer & Completion.Receipt), ~dispose: S -> IO(Unit),
6485 observer: Completion.Receipt, receipt: Completion.Receipt, +settings: Limits, s: Socket, rest: Bytes.Bytes,
6486 +keep: Bool, +head: Bool, +status: U32, state: S, plan: WriterMode & Map<&2, List<&2, String>>
6487) -> IO(Maybe<&1, Socket & Turn>):
6488 Limits{max, cap, hm, bm, im, wm} = settings
6489 (mode, headers) = plan
6490 sent_headers = writer.connection(keep, headers)
6491 do IO<Maybe<&1, Socket & Turn>>:
6492 now : Time.Duration <- Time.mono()
6493 +until : Time.Duration = Time.Duration.add(now, Time.Duration.of_ms(wm))
6494 sent : Socket & Result<&1, &1, U32 & String, Unit> <-
6495 bounded.send(s, Bytes.from_string(response(status, sent_headers, "")), until)
6496 serve.write.open(~S, ~write, ~dispose, observer, receipt, status, settings, keep, rest, state, mode,
6497 frame.nobody(status, head), until, sent)
6498
6499def serve.write.send(
6500 ~S: Type, ~write: S -> Writer -> Completion.Receipt -> IO(Writer & Completion.Receipt), ~dispose: S -> IO(Unit), observer: Completion.Receipt, settings: Limits, s: Socket, rest: Bytes.Bytes,
6501 +headers: Map<&2, List<&2, String>>, v11: Bool, +head: Bool, out: WriteHead<S>
6502) -> IO(Maybe<&1, Socket & Turn>):
6503 WriteHead{+status, rh, length, state, receipt} = out
6504 +normalized = writer.headers(Map.to_list(&2, List<&2, String>, rh), empty())
6505 +keep = serve.keep(headers, v11, status, normalized)
6506 serve.write.send.plan(~S, ~write, ~dispose, observer, receipt, settings, s, rest, keep, head, status, state,
6507 writer.plan(frame.nobody(status, False{}), normalized, length))
6508
6509def admission.write(
6510 ~S: Type, ~start: Req -> IO(WriteHead<S>), ~write: S -> Writer -> Completion.Receipt -> IO(Writer & Completion.Receipt), ~dispose: S -> IO(Unit), ~observe: U32 -> Completion.Outcome -> IO(Unit),
6511 admitted: Bool, +inbox: Chan(Admission.Command), +settings: Limits,
6512 s: Socket, req: Req, rest: Bytes.Bytes, v11: Bool
6513) -> IO(Maybe<&1, Socket & Turn>):
6514 match admitted:
6515 case False{}:
6516 Limits{max, cap, hm, bm, im, wm} = settings
6517 do IO<Maybe<&1, Socket & Turn>>:
6518 admission.reject(Completion.Observed{status => outcome => observe(status, outcome)}, s, admission.head(req), wm)
6519 return None{}
6520 case True{}:
6521 Req{+method, path, +headers, body} = req
6522 do IO<Maybe<&1, Socket & Turn>>:
6523 out : WriteHead<S> <- start(Req{method, path, headers, body})
6524 after : Maybe<&1, Socket & Turn> <- serve.write.send(~S, ~write, ~dispose, Completion.Observed{status => outcome => observe(status, outcome)}, settings, s, rest, headers, v11, String.eq(method, "HEAD"), out)
6525 Admission.give(inbox, 1)
6526 return after
6527
6528@unsafe
6529def serve.write.talk(
6530 ~S: Type, ~start: Req -> IO(WriteHead<S>), ~write: S -> Writer -> Completion.Receipt -> IO(Writer & Completion.Receipt), ~dispose: S -> IO(Unit), ~observe: U32 -> Completion.Outcome -> IO(Unit),
6531 +settings: Limits, +inbox: Chan(Admission.Command), st: Maybe<&1, Serving>
6532) -> IO(Unit):
6533 Limits{max, cap, hm, bm, im, wm} = settings
6534 match st:
6535 case None{}:
6536 IO.pure(Unit, Unit{})
6537 case Some{Serving{(s, t), phase}}:
6538 match t:
6539 case TurnMore{sv, cont}:
6540 do IO<Unit>:
6541 received : (Socket & Turn) & Phase <- talk.recv(inbox, False{}, settings, s, sv, cont, phase)
6542 serve.write.talk(~S, ~start, ~write, ~dispose, ~observe, settings, inbox, Some{talk.state(received)})
6543 case TurnReq{req, rest, v11}:
6544 do IO<Unit>:
6545 admitted : Bool <- Admission.take(inbox, 1)
6546 after : Maybe<&1, Socket & Turn> <- admission.write(~S, ~start, ~write, ~dispose, ~observe, admitted, inbox, settings, s, req, rest, v11)
6547 serve.write.talk(~S, ~start, ~write, ~dispose, ~observe, settings, inbox, serve.write.state(after))
6548 case TurnFail{status}:
6549 reply_fail(Completion.Observed{status => outcome => observe(status, outcome)}, s, status, wm)
6550 case TurnClose{}:
6551 Socket.close(s)
6552 case TurnInputFailed{operation, code, message}:
6553 Socket.close(s)
6554
6555def server.write.run(
6556 ~S: Type, ~start: Req -> IO(WriteHead<S>),
6557 ~write: S -> Writer -> Completion.Receipt -> IO(Writer & Completion.Receipt),
6558 ~dispose: S -> IO(Unit),
6559 ~observe: U32 -> Completion.Outcome -> IO(Unit), server: Server<Unit>
6560) -> IO(ServerExit):
6561 server.run.loop(~Unit,
6562 ~(context => settings => inbox => socket =>
6563 serve.write.talk(~S, ~start, ~write, ~dispose, ~observe, settings, inbox,
6564 Some{Serving{(socket, TurnMore{sv.none(), False{}}), None{}}})),
6565 ServerListening{server})
6566
6567def serve.write.started(
6568 ~S: Type, ~start: Req -> IO(WriteHead<S>), ~write: S -> Writer -> Completion.Receipt -> IO(Writer & Completion.Receipt), ~dispose: S -> IO(Unit), ~observe: U32 -> Completion.Outcome -> IO(Unit),
6569 result: Unit & Result<&2, &1, StartupError, Server<Unit>>
6570) -> IO(Result<&2, &2, StartupError, Unit>):
6571 (owner, got) = result
6572 match got:
6573 case Fail{error}:
6574 IO.pure(Result<&2, &2, StartupError, Unit>, Fail{error})
6575 case Done{server}:
6576 do IO<Result<&2, &2, StartupError, Unit>>:
6577 exited : ServerExit <- server.write.run(~S, ~start, ~write, ~dispose, ~observe, server)
6578 server.exited(exited)
6579 return Done{Unit{}}
6580
6581def serve.write.config(
6582 ~S: Type, ~start: Req -> IO(WriteHead<S>), ~write: S -> Writer -> Completion.Receipt -> IO(Writer & Completion.Receipt), ~dispose: S -> IO(Unit), ~observe: U32 -> Completion.Outcome -> IO(Unit), config: ServerConfig
6583) -> IO(Result<&2, &2, StartupError, Unit>):
6584 do IO<Result<&2, &2, StartupError, Unit>>:
6585 started : Unit & Result<&2, &1, StartupError, Server<Unit>> <- server.start(~Unit, ~Unit, Unit{}, Unit{}, config)
6586 serve.write.started(~S, ~start, ~write, ~dispose, ~observe, started)
6587
6588def serve.started(~h: Req -> IO(Reply), ~observe: U32 -> Completion.Outcome -> IO(Unit),
6589 started: Unit & Result<&2, &1, StartupError, Server<Unit>>) -> IO(Unit):
6590 (owner, result) = started
6591 match result:
6592 case Fail{error}: server.start.failed(error)
6593 case Done{server}:
6594 do IO<Unit>:
6595 exited : ServerExit <- server.run(~Unit, ~(context => req => h(req)),
6596 ~(context => status => outcome => observe(status, outcome)), server)
6597 server.exited(exited)
6598
6599def serve.on.with(~h: Req -> IO(Reply), ~observe: U32 -> Completion.Outcome -> IO(Unit), host: String, +port: U32, +max: Nat) -> IO(Unit):
6600 do IO<Unit>:
6601 limits.validate(max)
6602 started : Unit & Result<&2, &1, StartupError, Server<Unit>> <-
6603 server.start(~Unit, ~Unit, Unit{}, Unit{}, server.config.with(host, port, max))
6604 serve.started(~h, ~observe, started)
6605
6606def serve.on(~h: Req -> IO(Reply), ~observe: U32 -> Completion.Outcome -> IO(Unit), host: String, +port: U32) -> IO(Unit):
6607 serve.on.with(~h, ~observe, host, port, serve.max())
6608
6609def serve.with(~h: Req -> IO(Reply), ~observe: U32 -> Completion.Outcome -> IO(Unit), +port: U32, +max: Nat) -> IO(Unit):
6610 serve.on.with(~h, ~observe, "0.0.0.0", port, max)
6611
6612def serve(~h: Req -> IO(Reply), ~observe: U32 -> Completion.Outcome -> IO(Unit), +port: U32) -> IO(Unit):
6613 serve.with(~h, ~observe, port, serve.max())
6614
6615def serve.stream.on.with(
6616 ~S: Type, ~start: Req -> IO(S), ~piece: S -> Bytes.Bytes -> IO(S & Bool),
6617 ~finish: S -> IO(Reply), ~abort: S -> StreamAbort -> IO(Unit), ~observe: U32 -> Completion.Outcome -> IO(Unit), host: String, +port: U32, +max: Nat
6618) -> IO(Unit):
6619 do IO<Unit>:
6620 limits.validate(max)
6621 result : Result<&2, &2, StartupError, Unit> <-
6622 serve.stream.config(~S, ~start, ~piece, ~finish, ~abort, ~observe, server.config.with(host, port, max))
6623 serve.config.result(result)
6624
6625def serve.stream.with(
6626 ~S: Type, ~start: Req -> IO(S), ~piece: S -> Bytes.Bytes -> IO(S & Bool),
6627 ~finish: S -> IO(Reply), ~abort: S -> StreamAbort -> IO(Unit), ~observe: U32 -> Completion.Outcome -> IO(Unit), +port: U32, +max: Nat
6628) -> IO(Unit):
6629 serve.stream.on.with(~S, ~start, ~piece, ~finish, ~abort, ~observe, "0.0.0.0", port, max)
6630
6631def serve.write.on.with(
6632 ~S: Type, ~start: Req -> IO(WriteHead<S>), ~write: S -> Writer -> Completion.Receipt -> IO(Writer & Completion.Receipt), ~dispose: S -> IO(Unit), ~observe: U32 -> Completion.Outcome -> IO(Unit),
6633 host: String, +port: U32, +max: Nat
6634) -> IO(Unit):
6635 do IO<Unit>:
6636 limits.validate(max)
6637 result : Result<&2, &2, StartupError, Unit> <-
6638 serve.write.config(~S, ~start, ~write, ~dispose, ~observe, server.config.with(host, port, max))
6639 serve.config.result(result)
6640
6641def serve.write.with(
6642 ~S: Type, ~start: Req -> IO(WriteHead<S>), ~write: S -> Writer -> Completion.Receipt -> IO(Writer & Completion.Receipt), ~dispose: S -> IO(Unit), ~observe: U32 -> Completion.Outcome -> IO(Unit),
6643 +port: U32, +max: Nat
6644) -> IO(Unit):
6645 serve.write.on.with(~S, ~start, ~write, ~dispose, ~observe, "0.0.0.0", port, max)