camber.bend
bend-kit-camber@0.11.0.0 · 1,280 lines · 0 definitions
1# Fixed prepared HTTP applications and bounded affine dependency bundles.
2import Base
3import bend-kit-http@0.35.0.0/http.bend as Http
4import bend-kit-router@0.2.0.0/router.bend as Router
5import bend-kit-router@0.2.0.0/target.bend as Target
6import bend-kit-json@0.6.1.1/json.bend as Json
7import bend-kit-camber@0.11.0.0/response.bend as Response
8import bend-kit-camber@0.11.0.0/input.bend as Input
9import bend-kit-http@0.35.0.0/completion.bend as TransportCompletion
10import bend-kit-camber@0.11.0.0/notices.bend as Notices
11import bend-kit-time@0.2.0.0/time.bend as Time
12import bend-kit-resources@0.1.0.0/resources.bend as Res
13
14type ResponseError is Data:
15 InvalidResponse{}
16 InvalidRedirect{}
17
18def validate.checked(valid: Bool, response: Http.Res) -> Result<&2, &1, ResponseError, Http.Res>:
19 match valid:
20 case True{}:
21 Done{response}
22 case False{}:
23 Fail{InvalidResponse{}}
24
25def validate(response: Http.Res) -> Result<&2, &1, ResponseError, Http.Res>:
26 Http.Res{+status, +headers, body} = response
27 validate.checked(Response.valid(status, headers), Http.Res{status, headers, body})
28
29# The encoder is an explicit public projection, never record reflection.
30def json(~T: Type, ~encode: T -> Json.Val, status: U32, value: T) -> Http.Res:
31 Http.Res{status, Http.set(Http.empty(), "content-type", "application/json"), Json.encode.bytes(encode(value))}
32
33def text(status: U32, value: String) -> Http.Res:
34 Http.Res{status, Http.set(Http.empty(), "content-type", "text/plain; charset=utf-8"), Json.utf8(value)}
35
36def raw(status: U32, body: Http.Body) -> Http.Res:
37 Http.Res{status, Http.empty(), body}
38
39def empty(status: U32) -> Http.Res:
40 raw(status, Http.from_string(""))
41
42def redirect.checked(valid: Bool, status: U32, location: String) -> Result<&2, &1, ResponseError, Http.Res>:
43 match valid:
44 case False{}:
45 Fail{InvalidRedirect{}}
46 case True{}:
47 Done{Http.Res{status, Http.set(Http.empty(), "location", location), Http.from_string("")}}
48
49def redirect(+status: U32, +location: String) -> Result<&2, &1, ResponseError, Http.Res>:
50 redirect.checked((U32.is_eq(status, 301) || U32.is_eq(status, 302) || U32.is_eq(status, 303) || U32.is_eq(status, 307) || U32.is_eq(status, 308)) && Bool.not(String.eq(location, "")) && Response.value(location), status, location)
51
52type Counts is Data:
53 Counts{capacity: Nat, in_use: Nat, completed: Nat, rejected: Nat}
54
55type Outcome<-E: Data, -O: Data> is Data:
56 Success{value: O}
57 Expected{error: E}
58 Exhausted{}
59 Stopped{}
60
61type CloseResult is Data:
62 Closed{}
63 Busy{counts: Counts}
64
65type Message<-R: Type, -P: Data, -I: Data, -E: Data, -O: Data> is Type:
66 Submit{principal: P, input: I, reply: Chan(Outcome<E, O>)}
67 Returned{resource: R}
68 Inspect{reply: Chan(Counts)}
69 Shutdown{reply: Chan(CloseResult)}
70
71# Copy only this context, never the resources. The inbox bounds queued commands;
72# callers must count blocked submissions inside their transport admission limit.
73type Context<-R: Type, -P: Data, -I: Data, -E: Data, -O: Data> is Data:
74 Context{messages: Chan(Message<R, P, I, E, O>)}
75
76# The completion future has one affine owner; request contexts copy only inbox.
77type Owner<-R: Type, -P: Data, -I: Data, -E: Data, -O: Data> is Type:
78 Owner{context: Context<R, P, I, E, O>, finished: Chan(Unit)}
79
80type OwnerClose<-R: Type, -P: Data, -I: Data, -E: Data, -O: Data> is Type:
81 OwnerClosed{}
82 OwnerBusy{owner: Owner<R, P, I, E, O>, counts: Counts}
83
84def owner.context(-R: Type, -P: Data, -I: Data, -E: Data, -O: Data,
85 owner: Owner<R, P, I, E, O>
86) -> Owner<R, P, I, E, O> & Context<R, P, I, E, O>:
87 Owner{+context, finished} = owner
88 (Owner{context, finished}, context)
89
90def outcome.value(-E: Data, -O: Data, result: Result<&2, &2, E, O>) -> Outcome<E, O>:
91 match result:
92 case Fail{error}:
93 Expected{error}
94 case Done{value}:
95 Success{value}
96
97def dispose(~R: Type, ~destroy: R -> IO(Unit), resources: List<R>) -> IO(Unit):
98 match resources:
99 case Nil{}:
100 IO.pure(Unit, Unit{})
101 case Con{resource, rest}:
102 do IO<Unit>:
103 destroy(resource)
104 dispose(~R, ~destroy, rest)
105
106# Closing Base channels retains buffered messages. Drain them and answer stopped
107# callers, rather than stranding accepted commands behind the close command.
108def drain.message(~R: Type, ~P: Data, ~I: Data, ~E: Data, ~O: Data,
109 ~destroy: R -> IO(Unit), message: Message<R, P, I, E, O>
110) -> IO(Unit):
111 match message:
112 case Submit{principal, input, reply}:
113 do IO<Unit>:
114 sent : Result<&1, &1, Outcome<E, O>, Unit> <- Chan.send(Outcome<E, O>, reply, Stopped{})
115 return Unit{}
116 case Inspect{reply}:
117 Chan.close(Counts, reply)
118 case Shutdown{reply}:
119 do IO<Unit>:
120 sent : Result<&1, &1, CloseResult, Unit> <- Chan.send(CloseResult, reply, Closed{})
121 return Unit{}
122 case Returned{resource}:
123 destroy(resource)
124
125# The resources return through the private owner protocol BEFORE a disposable
126# caller reply. A closed caller reply cannot erase a handle or strand capacity.
127def work.returned(~R: Type, ~P: Data, ~I: Data, ~E: Data, ~O: Data,
128 ~destroy: R -> IO(Unit), accepted: Result<&1, &1, Message<R, P, I, E, O>, Unit>
129) -> IO(Unit):
130 match accepted:
131 case Fail{message}:
132 drain.message(~R, ~P, ~I, ~E, ~O, ~destroy, message)
133 case Done{u}:
134 IO.pure(Unit, Unit{})
135
136def work.return(~R: Type, ~P: Data, ~I: Data, ~E: Data, ~O: Data,
137 ~destroy: R -> IO(Unit),
138 messages: Chan(Message<R, P, I, E, O>), reply: Chan(Outcome<E, O>),
139 result: R & Result<&2, &2, E, O>
140) -> IO(Unit):
141 (returned, outcome) = result
142 do IO<Unit>:
143 accepted : Result<&1, &1, Message<R, P, I, E, O>, Unit> <- Chan.send(Message<R, P, I, E, O>, messages, Returned{returned})
144 work.returned(~R, ~P, ~I, ~E, ~O, ~destroy, accepted)
145 sent : Result<&1, &1, Outcome<E, O>, Unit> <- Chan.send(Outcome<E, O>, reply, outcome.value(E, O, outcome))
146 return Unit{}
147
148def work(~R: Type, ~P: Data, ~I: Data, ~E: Data, ~O: Data,
149 ~handler: R -> P -> I -> IO(R & Result<&2, &2, E, O>), ~destroy: R -> IO(Unit),
150 resource: R, principal: P, input: I,
151 messages: Chan(Message<R, P, I, E, O>), reply: Chan(Outcome<E, O>)
152) -> IO(Unit):
153 do IO<Unit>:
154 result : R & Result<&2, &2, E, O> <- handler(resource, principal, input)
155 work.return(~R, ~P, ~I, ~E, ~O, ~destroy, messages, reply, result)
156
157def drain.step(~R: Type, ~P: Data, ~I: Data, ~E: Data, ~O: Data,
158 ~destroy: R -> IO(Unit), pending: Maybe<&1, Message<R, P, I, E, O>>,
159 next: Unit -> IO(Unit)
160) -> IO(Unit):
161 match pending:
162 case None{}:
163 IO.pure(Unit, Unit{})
164 case Some{message}:
165 do IO<Unit>:
166 drain.message(~R, ~P, ~I, ~E, ~O, ~destroy, message)
167 next(Unit{})
168
169# The closed inbox contains at most room buffered messages.
170def drain(~R: Type, ~P: Data, ~I: Data, ~E: Data, ~O: Data,
171 ~destroy: R -> IO(Unit), fuel: Nat, +messages: Chan(Message<R, P, I, E, O>)
172) -> IO(Unit):
173 match fuel:
174 case 0n:
175 IO.pure(Unit, Unit{})
176 case 1n+p:
177 do IO<Unit>:
178 pending : Maybe<&1, Message<R, P, I, E, O>> <- Chan.recv(Message<R, P, I, E, O>, messages)
179 drain.step(~R, ~P, ~I, ~E, ~O, ~destroy, pending, u => drain(~R, ~P, ~I, ~E, ~O, ~destroy, p, messages))
180
181# Every lent resource holds one pool unit, and all lent units join in one grant.
182type Ledger is Type:
183 Ledger{pool: Res.Pool, lent: Res.Grant, completed: Nat, rejected: Nat}
184
185def ledger.open(capacity: Nat) -> Ledger:
186 Ledger{Res.new(0n, capacity), Res.Grant{0n, 0n}, 0n, 0n}
187
188def ledger.counts(ledger: Ledger) -> Counts & Ledger:
189 Ledger{+pool, lent, +completed, +rejected} = ledger
190 (Counts{Res.capacity(pool), Res.reserved(pool), completed, rejected}, Ledger{pool, lent, completed, rejected})
191
192def ledger.refuse(ledger: Ledger) -> Ledger:
193 Ledger{pool, lent, completed, rejected} = ledger
194 Ledger{pool, lent, completed, 1n+rejected}
195
196def ledger.joined(combined: Res.Combine, pool: Res.Pool, completed: Nat, rejected: Nat) -> Maybe<&1, Ledger>:
197 match combined:
198 case Res.Joined{grant}:
199 Some{Ledger{pool, grant, completed, rejected}}
200 case Res.Apart{first, second}:
201 None{}
202
203def ledger.took(reserved: Res.Reserve, lent: Res.Grant, completed: Nat, rejected: Nat) -> Maybe<&1, Ledger>:
204 match reserved:
205 case Res.Took{pool, grant}:
206 ledger.joined(Res.combine(lent, grant), pool, completed, rejected)
207 case Res.Refused{pool}:
208 None{}
209
210# None means the pool has no free unit for a resource the owner still holds.
211def ledger.lend(ledger: Ledger) -> Maybe<&1, Ledger>:
212 Ledger{pool, lent, completed, rejected} = ledger
213 ledger.took(Res.reserve(pool, 1n), lent, completed, rejected)
214
215def ledger.released(released: Res.Release, rest: Res.Grant, completed: Nat, rejected: Nat) -> Maybe<&1, Ledger>:
216 match released:
217 case Res.Released{pool}:
218 Some{Ledger{pool, rest, 1n+completed, rejected}}
219 case Res.Kept{pool, grant}:
220 None{}
221
222def ledger.split(parts: Res.Split, pool: Res.Pool, completed: Nat, rejected: Nat) -> Maybe<&1, Ledger>:
223 match parts:
224 case Res.Parts{one, rest}:
225 ledger.released(Res.release(pool, one), rest, completed, rejected)
226 case Res.Whole{grant}:
227 None{}
228
229# None means a return with no matching lend.
230def ledger.give(ledger: Ledger) -> Maybe<&1, Ledger>:
231 Ledger{pool, lent, completed, rejected} = ledger
232 ledger.split(Res.split(lent, 1n), pool, completed, rejected)
233
234def ledger.must(booked: Maybe<&1, Ledger>, text: String) -> IO(Ledger):
235 match booked:
236 case None{}:
237 IO.die(Ledger, 1, text)
238 case Some{ledger}:
239 IO.pure(Ledger, ledger)
240
241type OwnerStep<-R: Type, -P: Data, -I: Data, -E: Data, -O: Data> is Type:
242 Waiting{resources: List<R>, ledger: Ledger}
243 Received{message: Message<R, P, I, E, O>, ledger: Ledger, resources: List<R>}
244 Counted{reply: Chan(Counts), counted: Counts & Ledger, resources: List<R>}
245 Closing{reply: Chan(CloseResult), counted: Counts & Ledger, resources: List<R>}
246
247# IO.join closes a one-shot channel; the owner inbox must remain reusable.
248def receive.value(-A: Type, value: Maybe<&1, A>) -> IO(A):
249 match value:
250 case None{}:
251 IO.die(A, 1, "camber internal channel closed unexpectedly")
252 case Some{message}:
253 IO.pure(A, message)
254
255def receive(-A: Type, channel: Chan(A)) -> IO(A):
256 do IO<A>:
257 value : Maybe<&1, A> <- Chan.recv(A, channel)
258 receive.value(A, value)
259
260# Only idle close ends this loop. Busy close never waits on a stalled handler.
261# @unsafe is solely the lifecycle receive loop, not a termination/proof claim.
262@unsafe def owner(~R: Type, ~P: Data, ~I: Data, ~E: Data, ~O: Data,
263 ~handler: R -> P -> I -> IO(R & Result<&2, &2, E, O>), ~destroy: R -> IO(Unit),
264 +messages: Chan(Message<R, P, I, E, O>), +room: U32, step: OwnerStep<R, P, I, E, O>
265) -> IO(Unit):
266 match step:
267 case Waiting{resources, ledger}:
268 do IO<Unit>:
269 message : Message<R, P, I, E, O> <- receive(Message<R, P, I, E, O>, messages)
270 owner(~R, ~P, ~I, ~E, ~O, ~handler, ~destroy, messages, room, Received{message, ledger, resources})
271 case Counted{reply, counted, resources}:
272 (counts, kept) = counted
273 do IO<Unit>:
274 sent : Result<&1, &1, Counts, Unit> <- Chan.send(Counts, reply, counts)
275 owner(~R, ~P, ~I, ~E, ~O, ~handler, ~destroy, messages, room, Waiting{resources, kept})
276 case Closing{reply, counted, resources}:
277 (counts, kept) = counted
278 Counts{+capacity, in_use, +completed, +rejected} = counts
279 match in_use:
280 case 0n:
281 do IO<Unit>:
282 dispose(~R, ~destroy, resources)
283 Chan.close(Message<R, P, I, E, O>, messages)
284 sent : Result<&1, &1, CloseResult, Unit> <- Chan.send(CloseResult, reply, Closed{})
285 drain(~R, ~P, ~I, ~E, ~O, ~destroy, U32.to_nat(room), messages)
286 case 1n+p:
287 do IO<Unit>:
288 sent : Result<&1, &1, CloseResult, Unit> <- Chan.send(CloseResult, reply, Busy{Counts{capacity, 1n+p, completed, rejected}})
289 owner(~R, ~P, ~I, ~E, ~O, ~handler, ~destroy, messages, room, Waiting{resources, kept})
290 case Received{message, ledger, resources}:
291 match message:
292 case Returned{resource}:
293 do IO<Unit>:
294 given : Ledger <- ledger.must(ledger.give(ledger), "camber: a resource returned without a matching submit")
295 owner(~R, ~P, ~I, ~E, ~O, ~handler, ~destroy, messages, room, Waiting{resource <> resources, given})
296 case Inspect{reply}:
297 owner(~R, ~P, ~I, ~E, ~O, ~handler, ~destroy, messages, room, Counted{reply, ledger.counts(ledger), resources})
298 case Shutdown{reply}:
299 owner(~R, ~P, ~I, ~E, ~O, ~handler, ~destroy, messages, room, Closing{reply, ledger.counts(ledger), resources})
300 case Submit{principal, input, reply}:
301 match resources:
302 case Nil{}:
303 do IO<Unit>:
304 sent : Result<&1, &1, Outcome<E, O>, Unit> <- Chan.send(Outcome<E, O>, reply, Exhausted{})
305 owner(~R, ~P, ~I, ~E, ~O, ~handler, ~destroy, messages, room, Waiting{Nil{}, ledger.refuse(ledger)})
306 case Con{resource, rest}:
307 do IO<Unit>:
308 lent : Ledger <- ledger.must(ledger.lend(ledger), "camber: a held resource found no free pool unit")
309 IO.spawn(Unit, work(~R, ~P, ~I, ~E, ~O, ~handler, ~destroy, resource, principal, input, messages, reply))
310 owner(~R, ~P, ~I, ~E, ~O, ~handler, ~destroy, messages, room, Waiting{rest, lent})
311
312def build.step(~R: Type, ~E: Data, ~destroy: R -> IO(Unit),
313 result: Result<&2, &1, E, R>, resources: List<R>,
314 next: List<R> -> IO(Result<&2, &1, E, List<R>>)
315) -> IO(Result<&2, &1, E, List<R>>):
316 match result:
317 case Fail{error}:
318 do IO<Result<&2, &1, E, List<R>>>:
319 dispose(~R, ~destroy, resources)
320 return Fail{error}
321 case Done{resource}:
322 next(resource <> resources)
323
324def build(~K: Data, ~R: Type, ~E: Data, ~create: K -> Nat -> IO(Result<&2, &1, E, R>), ~destroy: R -> IO(Unit),
325 remaining: Nat, +config: K, resources: List<R>
326) -> IO(Result<&2, &1, E, List<R>>):
327 match remaining:
328 case 0n:
329 IO.pure(Result<&2, &1, E, List<R>>, Done{resources})
330 case 1n+ +p:
331 do IO<Result<&2, &1, E, List<R>>>:
332 result : Result<&2, &1, E, R> <- create(config, p)
333 build.step(~R, ~E, ~destroy, result, resources, next => build(~K, ~R, ~E, ~create, ~destroy, p, config, next))
334
335def start.ready(~R: Type, ~P: Data, ~I: Data, ~E: Data, ~O: Data,
336 ~handler: R -> P -> I -> IO(R & Result<&2, &2, E, O>), ~destroy: R -> IO(Unit),
337 capacity: Nat, +room: U32, result: Result<&2, &1, E, List<R>>
338) -> IO(Result<&2, &1, E, Owner<R, P, I, E, O>>):
339 match result:
340 case Fail{error}:
341 IO.pure(Result<&2, &1, E, Owner<R, P, I, E, O>>, Fail{error})
342 case Done{resources}:
343 do IO<Result<&2, &1, E, Owner<R, P, I, E, O>>>:
344 channel : Chan(Message<R, P, I, E, O>) <- Chan.new(Message<R, P, I, E, O>, room)
345 +messages : Chan(Message<R, P, I, E, O>) = channel
346 finished : Chan(Unit) <- IO.fork(Unit, owner(~R, ~P, ~I, ~E, ~O, ~handler, ~destroy, messages, room, Waiting{resources, ledger.open(capacity)}))
347 return Done{Owner{Context{messages}, finished}}
348
349# The initializer closes partial handles within a failed bundle; start closes
350# all prior whole bundles. No workers exist until the complete set opens.
351def start(~K: Data, ~R: Type, ~P: Data, ~I: Data, ~E: Data, ~O: Data,
352 ~create: K -> Nat -> IO(Result<&2, &1, E, R>),
353 ~handler: R -> P -> I -> IO(R & Result<&2, &2, E, O>), ~destroy: R -> IO(Unit),
354 config: K, +capacity: Nat, room: U32
355) -> IO(Result<&2, &1, E, Owner<R, P, I, E, O>>):
356 do IO<Result<&2, &1, E, Owner<R, P, I, E, O>>>:
357 result : Result<&2, &1, E, List<R>> <- build(~K, ~R, ~E, ~create, ~destroy, capacity, config, Nil{})
358 start.ready(~R, ~P, ~I, ~E, ~O, ~handler, ~destroy, capacity, room, result)
359
360def submit(-R: Type, -P: Data, -I: Data, -E: Data, -O: Data,
361 context: Context<R, P, I, E, O>, principal: P, input: I, reply: Chan(Outcome<E, O>)
362) -> IO(Result<&1, &1, Message<R, P, I, E, O>, Unit>):
363 Context{messages} = context
364 do IO<Result<&1, &1, Message<R, P, I, E, O>, Unit>>:
365 sent : Result<&1, &1, Message<R, P, I, E, O>, Unit> <- Chan.send(Message<R, P, I, E, O>, messages, Submit{principal, input, reply})
366 return sent
367
368def call.accepted(-T: Type, -E: Data, -O: Data, accepted: Result<&1, &1, T, Unit>, +reply: Chan(Outcome<E, O>)) -> IO(Outcome<E, O>):
369 match accepted:
370 case Fail{v}:
371 do IO<Outcome<E, O>>:
372 Chan.close(Outcome<E, O>, reply)
373 return Stopped{}
374 case Done{u}:
375 do IO<Outcome<E, O>>:
376 result : Outcome<E, O> <- IO.join(Outcome<E, O>, reply)
377 Chan.close(Outcome<E, O>, reply)
378 return result
379
380def call(-R: Type, -P: Data, -I: Data, -E: Data, -O: Data,
381 context: Context<R, P, I, E, O>, principal: P, input: I
382) -> IO(Outcome<E, O>):
383 do IO<Outcome<E, O>>:
384 channel : Chan(Outcome<E, O>) <- Chan.new(Outcome<E, O>, 1)
385 +reply : Chan(Outcome<E, O>) = channel
386 accepted : Result<&1, &1, Message<R, P, I, E, O>, Unit> <- submit(R, P, I, E, O, context, principal, input, reply)
387 call.accepted(Message<R, P, I, E, O>, E, O, accepted, reply)
388
389def inspect.value(value: Maybe<&1, Counts>) -> Maybe<&2, Counts>:
390 match value:
391 case None{}:
392 None{}
393 case Some{counts}:
394 Some{counts}
395
396def inspect.sent(-T: Type, sent: Result<&1, &1, T, Unit>, +reply: Chan(Counts)) -> IO(Maybe<&2, Counts>):
397 match sent:
398 case Fail{v}:
399 do IO<Maybe<&2, Counts>>:
400 Chan.close(Counts, reply)
401 return None{}
402 case Done{u}:
403 do IO<Maybe<&2, Counts>>:
404 value : Maybe<&1, Counts> <- Chan.recv(Counts, reply)
405 Chan.close(Counts, reply)
406 return inspect.value(value)
407
408def inspect(-R: Type, -P: Data, -I: Data, -E: Data, -O: Data, context: Context<R, P, I, E, O>) -> IO(Maybe<&2, Counts>):
409 Context{messages} = context
410 do IO<Maybe<&2, Counts>>:
411 channel : Chan(Counts) <- Chan.new(Counts, 1)
412 +reply : Chan(Counts) = channel
413 sent : Result<&1, &1, Message<R, P, I, E, O>, Unit> <- Chan.send(Message<R, P, I, E, O>, messages, Inspect{reply})
414 inspect.sent(Message<R, P, I, E, O>, sent, reply)
415
416def close.sent(-T: Type, sent: Result<&1, &1, T, Unit>, +reply: Chan(CloseResult)) -> IO(CloseResult):
417 match sent:
418 case Fail{v}:
419 do IO<CloseResult>:
420 Chan.close(CloseResult, reply)
421 return Closed{}
422 case Done{u}:
423 do IO<CloseResult>:
424 value : CloseResult <- IO.join(CloseResult, reply)
425 Chan.close(CloseResult, reply)
426 return value
427
428def close.join(-R: Type, -P: Data, -I: Data, -E: Data, -O: Data,
429 owner: Owner<R, P, I, E, O>
430) -> IO(OwnerClose<R, P, I, E, O>):
431 Owner{context, finished} = owner
432 do IO<OwnerClose<R, P, I, E, O>>:
433 IO.join(Unit, finished)
434 return OwnerClosed{}
435
436def close.completed(-R: Type, -P: Data, -I: Data, -E: Data, -O: Data,
437 result: CloseResult, owner: Owner<R, P, I, E, O>
438) -> IO(OwnerClose<R, P, I, E, O>):
439 match result:
440 case Closed{}:
441 close.join(R, P, I, E, O, owner)
442 case Busy{counts}:
443 IO.pure(OwnerClose<R, P, I, E, O>, OwnerBusy{owner, counts})
444
445# Stop external admissions before close. Busy preserves live context/capacity;
446# retry after admitted operations finish. Stalled operations remain observable.
447def close(-R: Type, -P: Data, -I: Data, -E: Data, -O: Data, owner: Owner<R, P, I, E, O>) -> IO(OwnerClose<R, P, I, E, O>):
448 Owner{Context{+messages}, finished} = owner
449 do IO<OwnerClose<R, P, I, E, O>>:
450 channel : Chan(CloseResult) <- Chan.new(CloseResult, 1)
451 +reply : Chan(CloseResult) = channel
452 sent : Result<&1, &1, Message<R, P, I, E, O>, Unit> <- Chan.send(Message<R, P, I, E, O>, messages, Shutdown{reply})
453 result : CloseResult <- close.sent(Message<R, P, I, E, O>, sent, reply)
454 close.completed(R, P, I, E, O, result, Owner{Context{messages}, finished})
455
456# Policies are prepared Data, not callbacks. Later lifecycle stages can consume
457# these root-to-route declarations without splitting patterns or finding groups.
458type Group<-P: Data> is Data:
459 Group{id: U32, ancestors: List<&2, U32>, policy: P}
460
461type GroupPlan<-P: Data> is Data:
462 GroupPlan{ids: List<&2, U32>, policies: List<&2, P>}
463
464type Route<-A: Data, -P: Data> is Data:
465 Route{method: String, pattern: String, action: A, groups: List<&2, U32>, policy: P}
466
467type Endpoint<-A: Data, -P: Data> is Data:
468 Endpoint{action: A, policies: List<&2, P>}
469
470type Application<-A: Data, -C: Data, -P: Data> is Data:
471 Application{table: Router.Table<Endpoint<A, P>>, context: C, root: P, groups: List<&2, GroupPlan<P>>}
472
473type RegistrationError is Data:
474 RouteError{error: Router.Error}
475 InvalidGroups{groups: List<&2, U32>}
476
477type Match<-P: Data> is Data:
478 Match{target: Target.Target, params: Map<&2, String>, groups: List<&2, U32>, method: String, pattern: String, policies: List<&2, P>}
479
480def groups.equal(xs: List<&2, U32>, ys: List<&2, U32>) -> Bool:
481 match xs ys:
482 case Nil{} Nil{}:
483 True{}
484 case x <> xt y <> yt:
485 U32.is_eq(x, y) && groups.equal(xt, yt)
486 case _ _:
487 False{}
488
489def group.pick(~P: Data, same: Bool, group: Group<P>, later: Unit -> Maybe<&2, Group<P>>) -> Maybe<&2, Group<P>>:
490 match same:
491 case True{}:
492 Some{group}
493 case False{}:
494 later(Unit{})
495
496def group.find(~P: Data, groups: List<&2, Group<P>>, +id: U32) -> Maybe<&2, Group<P>>:
497 match groups:
498 case Nil{}:
499 None{}
500 case Group{+here, ancestors, policy} <> rest:
501 group.pick(~P, U32.is_eq(here, id), Group{here, ancestors, policy}, u => group.find(~P, rest, id))
502
503def group.checked(~P: Data, same: Bool, policy: P) -> Maybe<&2, P>:
504 match same:
505 case False{}:
506 None{}
507 case True{}:
508 Some{policy}
509
510def group.policy(~P: Data, found: Maybe<&2, Group<P>>, ancestors: List<&2, U32>) -> Maybe<&2, P>:
511 match found:
512 case None{}:
513 None{}
514 case Some{Group{id, expected, policy}}:
515 group.checked(~P, groups.equal(expected, ancestors), policy)
516
517def groups.policies(~P: Data, ids: List<&2, U32>, +declared: List<&2, Group<P>>, +ancestors: List<&2, U32>) -> Maybe<&2, List<&2, P>>:
518 match ids:
519 case Nil{}:
520 Some{Nil{}}
521 case +id <> rest:
522 do Maybe<&2, List<&2, P>>:
523 policy : P <- group.policy(~P, group.find(~P, declared, id), ancestors)
524 policies : List<&2, P> <- groups.policies(~P, rest, declared, List.append(&2, U32, ancestors, [id]))
525 return policy <> policies
526
527def groups.unique(~P: Data, found: Maybe<&2, Group<P>>) -> Bool:
528 match found:
529 case None{}:
530 True{}
531 case Some{group}:
532 False{}
533
534def groups.valid(~P: Data, groups: List<&2, Group<P>>, +all: List<&2, Group<P>>) -> Bool:
535 match groups:
536 case Nil{}:
537 True{}
538 case Group{+id, +ancestors, policy} <> +rest:
539 chain = groups.policies(~P, List.append(&2, U32, ancestors, [id]), all, Nil{})
540 groups.unique(~P, group.find(~P, rest, id)) && Maybe.is_some(&2, List<&2, P>, chain) && groups.valid(~P, rest, all)
541
542def routes.policies(~P: Data, result: Maybe<&2, List<&2, P>>, ids: List<&2, U32>) -> Result<&2, &2, RegistrationError, List<&2, P>>:
543 match result:
544 case None{}:
545 Fail{InvalidGroups{ids}}
546 case Some{policies}:
547 Done{policies}
548
549def routes.prepare(~A: Data, ~P: Data, routes: List<&2, Route<A, P>>, +groups: List<&2, Group<P>>, +root: P) -> Result<&2, &2, RegistrationError, List<&2, Router.Entry<Endpoint<A, P>>>>:
550 match routes:
551 case Nil{}:
552 Done{Nil{}}
553 case Route{method, pattern, action, +ids, policy} <> rest:
554 do Result<&2, &2, RegistrationError, List<&2, Router.Entry<Endpoint<A, P>>>>:
555 policies : List<&2, P> <- routes.policies(~P, groups.policies(~P, ids, groups, Nil{}), ids)
556 entries : List<&2, Router.Entry<Endpoint<A, P>>> <- routes.prepare(~A, ~P, rest, groups, root)
557 return Router.Entry{method, pattern, Endpoint{action, root <> List.append(&2, P, policies, [policy])}, ids} <> entries
558
559def groups.prepare(~P: Data, groups: List<&2, Group<P>>, +all: List<&2, Group<P>>) -> Result<&2, &2, RegistrationError, List<&2, GroupPlan<P>>>:
560 match groups:
561 case Nil{}:
562 Done{Nil{}}
563 case Group{id, ancestors, policy} <> rest:
564 +ids = List.append(&2, U32, ancestors, [id])
565 do Result<&2, &2, RegistrationError, List<&2, GroupPlan<P>>>:
566 policies : List<&2, P> <- routes.policies(~P, groups.policies(~P, ids, all, Nil{}), ids)
567 plans : List<&2, GroupPlan<P>> <- groups.prepare(~P, rest, all)
568 return GroupPlan{ids, policies} <> plans
569
570def groups.select(~P: Data, same: Bool, policies: List<&2, P>, later: Unit -> List<&2, P>) -> List<&2, P>:
571 match same:
572 case True{}: policies
573 case False{}: later(Unit{})
574
575def groups.prepared(~P: Data, plans: List<&2, GroupPlan<P>>, +ids: List<&2, U32>) -> List<&2, P>:
576 match plans:
577 case Nil{}:
578 Nil{}
579 case GroupPlan{here, policies} <> rest:
580 groups.select(~P, groups.equal(here, ids), policies, u => groups.prepared(~P, rest, ids))
581
582def application.table(~A: Data, ~C: Data, ~P: Data, result: Result<&2, &2, Router.Error, Router.Table<Endpoint<A, P>>>, context: C, root: P, groups: List<&2, GroupPlan<P>>) -> Result<&2, &2, RegistrationError, Application<A, C, P>>:
583 match result:
584 case Fail{error}:
585 Fail{RouteError{error}}
586 case Done{table}:
587 Done{Application{table, context, root, groups}}
588
589def application.valid(~A: Data, ~C: Data, ~P: Data, valid: Bool, routes: List<&2, Route<A, P>>, +groups: List<&2, Group<P>>, context: C, +root: P) -> Result<&2, &2, RegistrationError, Application<A, C, P>>:
590 match valid:
591 case False{}:
592 Fail{InvalidGroups{Nil{}}}
593 case True{}:
594 do Result<&2, &2, RegistrationError, Application<A, C, P>>:
595 entries : List<&2, Router.Entry<Endpoint<A, P>>> <- routes.prepare(~A, ~P, routes, groups, root)
596 plans : List<&2, GroupPlan<P>> <- groups.prepare(~P, groups, groups)
597 application.table(~A, ~C, ~P, Router.prepare(~Endpoint<A, P>, entries), context, root, plans)
598
599# Construction is pure and fallible; no listener or owner is started here.
600def application(~A: Data, ~C: Data, ~P: Data, routes: List<&2, Route<A, P>>, +groups: List<&2, Group<P>>, context: C, root: P) -> Result<&2, &2, RegistrationError, Application<A, C, P>>:
601 application.valid(~A, ~C, ~P, groups.valid(~P, groups, groups), routes, groups, context, root)
602
603def describe(~A: Data, ~C: Data, ~P: Data, app: Application<A, C, P>) -> List<&2, Router.Description>:
604 Application{table, context, root, groups} = app
605 Router.describe(~Endpoint<A, P>, table)
606
607# A closed template can run repeatedly; an affine callback registry cannot.
608def plain(~handler: Http.Req -> IO(Http.Res), req: Http.Req) -> IO(Result<&2, &1, ResponseError, Http.Res>):
609 do IO<Result<&2, &1, ResponseError, Http.Res>>:
610 response : Http.Res <- handler(req)
611 return validate(response)
612
613type Policy<-H: Data> is Data:
614 Policy{id: U32, before: List<&2, H>, transforms: List<&2, H>}
615
616def policy(~H: Data, id: U32, before: List<&2, H>, transforms: List<&2, H>) -> Policy<H>:
617 Policy{id, before, List.reverse(&2, H, transforms)}
618
619type Metadata is Data:
620 Metadata{method: String, target: String, headers: Map<&2, List<&2, String>>}
621
622type Error<-E: Data> is Data:
623 ApplicationError{error: E}
624 Framework{status: U32, allow: String}
625 ResponseInvalid{}
626
627# Adapt reusable input status failures to the existing one-pass dispatch mapper.
628def input(~I: Type, ~E: Data, outcome: Result<&2, &1, U32, I>) -> Result<&2, &1, Error<E>, I>:
629 match outcome:
630 case Fail{status}: Fail{Framework{status, ""}}
631 case Done{value}: Done{value}
632
633def execute.decoded(~I: Type, ~S: Type, ~K: Data, ~E: Data,
634 ~handler: S -> K -> I -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
635 outcome: Result<&2, &1, Error<E>, I>, state: S, config: K
636) -> IO(S & Result<&2, &1, Error<E>, Http.Res>):
637 match outcome:
638 case Fail{error}: IO.pure(S & Result<&2, &1, Error<E>, Http.Res>, (state, Fail{error}))
639 case Done{value}: handler(state, config, value)
640
641# An executor, not a second dispatcher: call from dispatch's run template, after
642# all applicable before hooks. Only validated typed input reaches business IO.
643def execute(~I: Type, ~S: Type, ~K: Data, ~E: Data, ~H: Data,
644 ~decoder: K -> Match<Policy<H>> -> Http.Req -> Result<&2, &1, Error<E>, I>,
645 ~handler: S -> K -> I -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
646 state: S, +config: K, selected: Match<Policy<H>>, req: Http.Req
647) -> IO(S & Result<&2, &1, Error<E>, Http.Res>):
648 execute.decoded(~I, ~S, ~K, ~E, ~handler, decoder(config, selected, req), state, config)
649
650type Step<-S: Type, -E: Data> is Type:
651 Continue{state: S}
652 Early{state: S, response: Http.Res}
653 Reject{state: S, error: Error<E>}
654
655type Completion<-S: Type, -H: Data> is Type:
656 Completed{state: S, response: Http.Res, entered: List<&2, Policy<H>>, mapped: Bool, stopped: Bool}
657
658# Application completion only: no socket write, duration, or peer-receipt claim.
659def minimal() -> Http.Res:
660 empty(500)
661
662def problem.allow(add: Bool, headers: Map<&2, List<&2, String>>, allow: String) -> Map<&2, List<&2, String>>:
663 match add:
664 case True{}: Http.set(headers, "allow", allow)
665 case False{}: headers
666
667def problem.response(allow: String, response: Http.Res) -> Http.Res:
668 Http.Res{+status, headers, body} = response
669 Http.Res{status, problem.allow(U32.is_eq(status, 405), Http.set(headers, "content-type", "application/problem+json"), allow), body}
670
671def problem(+status: U32, title: String, allow: String) -> Http.Res:
672 problem.response(allow, json(~Json.Val, ~(x => x), status, Json.Obj{[(Json.utf8("type"), Json.Str{Json.utf8("about:blank")}), (Json.utf8("title"), Json.Str{Json.utf8(title)}), (Json.utf8("status"), Json.Num{Json.utf8(U32.show(status))})]}))
673
674def default.error(~E: Data, error: Error<E>) -> Http.Res:
675 match error:
676 case Framework{status, allow}:
677 match status:
678 case 400:
679 problem(400, "Bad Request", allow)
680 case 404:
681 problem(404, "Not Found", allow)
682 case 405:
683 problem(405, "Method Not Allowed", allow)
684 case 415:
685 problem(415, "Unsupported Media Type", allow)
686 case _:
687 minimal()
688 case _:
689 minimal()
690
691def default.mapper(~S: Type, ~K: Data, ~E: Data, state: S, config: K, error: Error<E>) -> IO(S & Result<&2, &1, Error<E>, Http.Res>):
692 IO.pure(S & Result<&2, &1, Error<E>, Http.Res>, (state, Done{default.error(~E, error)}))
693
694def mapped.checked(~S: Type, ~H: Data, state: S, entered: List<&2, Policy<H>>, stopped: Bool, result: Result<&2, &1, ResponseError, Http.Res>) -> Completion<S, H>:
695 match result:
696 case Fail{error}:
697 Completed{state, minimal(), entered, True{}, True{}}
698 case Done{response}:
699 Completed{state, response, entered, True{}, stopped}
700
701def mapped.result(~S: Type, ~E: Data, ~H: Data, entered: List<&2, Policy<H>>, stopped: Bool, result: S & Result<&2, &1, Error<E>, Http.Res>) -> Completion<S, H>:
702 (state, outcome) = result
703 match outcome:
704 case Fail{error}:
705 Completed{state, minimal(), entered, True{}, True{}}
706 case Done{response}:
707 mapped.checked(~S, ~H, state, entered, stopped, validate(response))
708
709def failed(~S: Type, ~K: Data, ~E: Data, ~H: Data,
710 ~mapper: S -> K -> Error<E> -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
711 mapped: Bool, state: S, config: K, error: Error<E>, entered: List<&2, Policy<H>>, stopped: Bool
712) -> IO(Completion<S, H>):
713 match mapped:
714 case True{}:
715 IO.pure(Completion<S, H>, Completed{state, minimal(), entered, True{}, True{}})
716 case False{}:
717 do IO<Completion<S, H>>:
718 result : S & Result<&2, &1, Error<E>, Http.Res> <- mapper(state, config, error)
719 return mapped.result(~S, ~E, ~H, entered, stopped, result)
720
721def result(~S: Type, ~K: Data, ~E: Data, ~H: Data,
722 ~mapper: S -> K -> Error<E> -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
723 config: K, entered: List<&2, Policy<H>>, outcome: S & Result<&2, &1, Error<E>, Http.Res>
724) -> IO(Completion<S, H>):
725 (state, response) = outcome
726 match response:
727 case Fail{error}:
728 failed(~S, ~K, ~E, ~H, ~mapper, False{}, state, config, error, entered, False{})
729 case Done{res}:
730 IO.pure(Completion<S, H>, Completed{state, res, entered, False{}, False{}})
731
732def before.next(~S: Type, ~E: Data, step: Step<S, E>, next: S -> IO(Step<S, E>)) -> IO(Step<S, E>):
733 match step:
734 case Continue{state}:
735 next(state)
736 case Early{state, response}:
737 IO.pure(Step<S, E>, Early{state, response})
738 case Reject{state, error}:
739 IO.pure(Step<S, E>, Reject{state, error})
740
741def before(~S: Type, ~K: Data, ~E: Data, ~H: Data,
742 ~hook: H -> S -> K -> Metadata -> IO(Step<S, E>),
743 hooks: List<&2, H>, state: S, +config: K, +meta: Metadata
744) -> IO(Step<S, E>):
745 match hooks:
746 case Nil{}:
747 IO.pure(Step<S, E>, Continue{state})
748 case h <> rest:
749 do IO<Step<S, E>>:
750 step : Step<S, E> <- hook(h, state, config, meta)
751 before.next(~S, ~E, step, s => before(~S, ~K, ~E, ~H, ~hook, rest, s, config, meta))
752
753def transformed(~S: Type, ~K: Data, ~E: Data, ~H: Data,
754 ~mapper: S -> K -> Error<E> -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
755 config: K, entered: List<&2, Policy<H>>, mapped: Bool, outcome: S & Result<&2, &1, Error<E>, Http.Res>
756) -> IO(Completion<S, H>):
757 (state, response) = outcome
758 match response:
759 case Fail{error}:
760 failed(~S, ~K, ~E, ~H, ~mapper, mapped, state, config, error, entered, True{})
761 case Done{res}:
762 IO.pure(Completion<S, H>, Completed{state, res, entered, mapped, False{}})
763
764def transforms(~S: Type, ~K: Data, ~E: Data, ~H: Data,
765 ~hook: H -> S -> K -> Http.Res -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
766 ~mapper: S -> K -> Error<E> -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
767 hooks: List<&2, H>, +config: K, completion: Completion<S, H>
768) -> IO(Completion<S, H>):
769 match hooks:
770 case Nil{}:
771 IO.pure(Completion<S, H>, completion)
772 case h <> rest:
773 match completion:
774 case Completed{state, response, entered, mapped, True{}}:
775 IO.pure(Completion<S, H>, Completed{state, response, entered, mapped, True{}})
776 case Completed{state, response, +entered, +mapped, False{}}:
777 do IO<Completion<S, H>>:
778 changed : S & Result<&2, &1, Error<E>, Http.Res> <- hook(h, state, config, response)
779 next : Completion<S, H> <- transformed(~S, ~K, ~E, ~H, ~mapper, config, entered, mapped, changed)
780 transforms(~S, ~K, ~E, ~H, ~hook, ~mapper, rest, config, next)
781
782def entered.step(~S: Type, ~K: Data, ~E: Data, ~H: Data,
783 ~mapper: S -> K -> Error<E> -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
784 config: K, entered: List<&2, Policy<H>>, body: Http.Body, step: Step<S, E>, next: S -> List<&2, Policy<H>> -> Http.Body -> IO(Completion<S, H>)
785) -> IO(Completion<S, H>):
786 match step:
787 case Continue{state}:
788 next(state, entered, body)
789 case Early{state, response}:
790 IO.pure(Completion<S, H>, Completed{state, response, entered, False{}, False{}})
791 case Reject{state, error}:
792 failed(~S, ~K, ~E, ~H, ~mapper, False{}, state, config, error, entered, False{})
793
794def scopes(~S: Type, ~K: Data, ~E: Data, ~H: Data,
795 ~before_hook: H -> S -> K -> Metadata -> IO(Step<S, E>),
796 ~after_hook: H -> S -> K -> Http.Res -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
797 ~mapper: S -> K -> Error<E> -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
798 policies: List<&2, Policy<H>>, state: S, +config: K, +meta: Metadata, entered: List<&2, Policy<H>>, body: Http.Body,
799 next: S -> List<&2, Policy<H>> -> Http.Body -> IO(Completion<S, H>)
800) -> IO(Completion<S, H>):
801 match policies:
802 case Nil{}:
803 next(state, entered, body)
804 case Policy{+id, +hooks, +unwind} <> rest:
805 scope = {Policy{id, hooks, unwind} : Policy<H>}
806 do IO<Completion<S, H>>:
807 step : Step<S, E> <- before(~S, ~K, ~E, ~H, ~before_hook, hooks, state, config, meta)
808 inner : Completion<S, H> <- entered.step(~S, ~K, ~E, ~H, ~mapper, config, scope <> entered, body, step, s => ids => b => scopes(~S, ~K, ~E, ~H, ~before_hook, ~after_hook, ~mapper, rest, s, config, meta, ids, b, next))
809 transforms(~S, ~K, ~E, ~H, ~after_hook, ~mapper, unwind, config, inner)
810
811def finish.checked(~S: Type, ~K: Data, ~E: Data, ~H: Data,
812 ~mapper: S -> K -> Error<E> -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
813 state: S, config: K, entered: List<&2, Policy<H>>, mapped: Bool, stopped: Bool, checked: Result<&2, &1, ResponseError, Http.Res>
814) -> IO(Completion<S, H>):
815 match checked:
816 case Done{response}:
817 IO.pure(Completion<S, H>, Completed{state, response, entered, mapped, stopped})
818 case Fail{error}:
819 failed(~S, ~K, ~E, ~H, ~mapper, mapped, state, config, ResponseInvalid{}, entered, True{})
820
821def finish(~S: Type, ~K: Data, ~E: Data, ~H: Data,
822 ~mapper: S -> K -> Error<E> -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
823 config: K, completion: Completion<S, H>
824) -> IO(Completion<S, H>):
825 Completed{state, response, entered, mapped, stopped} = completion
826 finish.checked(~S, ~K, ~E, ~H, ~mapper, state, config, entered, mapped, stopped, validate(response))
827
828def policies.tail(~H: Data, policies: List<&2, Policy<H>>) -> List<&2, Policy<H>>:
829 match policies:
830 case Nil{}:
831 Nil{}
832 case root <> rest:
833 rest
834
835
836def endpoint(~A: Data, ~S: Type, ~K: Data, ~E: Data, ~H: Data,
837 ~run: A -> S -> K -> Match<Policy<H>> -> Http.Req -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
838 ~mapper: S -> K -> Error<E> -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
839 action: A, state: S, +config: K, selected: Match<Policy<H>>, meta: Metadata, entered: List<&2, Policy<H>>, body: Http.Body
840) -> IO(Completion<S, H>):
841 Metadata{method, target, headers} = meta
842 do IO<Completion<S, H>>:
843 outcome : S & Result<&2, &1, Error<E>, Http.Res> <- run(action, state, config, selected, Http.Req{method, target, headers, body})
844 result(~S, ~K, ~E, ~H, ~mapper, config, entered, outcome)
845
846def framework(~S: Type, ~K: Data, ~E: Data, ~H: Data,
847 ~mapper: S -> K -> Error<E> -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
848 +status: U32, allow: String, state: S, config: K, entered: List<&2, Policy<H>>, body: Http.Body
849) -> IO(Completion<S, H>):
850 match status:
851 case 204:
852 IO.pure(Completion<S, H>, Completed{state, Http.Res{204, Http.set(Http.empty(), "allow", allow), Http.from_string("")}, entered, False{}, False{}})
853 case _:
854 failed(~S, ~K, ~E, ~H, ~mapper, False{}, state, config, Framework{status, allow}, entered, False{})
855
856def choice(~A: Data, ~S: Type, ~K: Data, ~E: Data, ~H: Data,
857 ~before_hook: H -> S -> K -> Metadata -> IO(Step<S, E>),
858 ~after_hook: H -> S -> K -> Http.Res -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
859 ~run: A -> S -> K -> Match<Policy<H>> -> Http.Req -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
860 ~mapper: S -> K -> Error<E> -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
861 selected: Router.Choice<Endpoint<A, Policy<H>>>, target: Target.Target,
862 groups: List<&2, GroupPlan<Policy<H>>>, state: S, +config: K, +meta: Metadata, entered: List<&2, Policy<H>>, body: Http.Body
863) -> IO(Completion<S, H>):
864 match selected:
865 case Router.NotFound{}:
866 framework(~S, ~K, ~E, ~H, ~mapper, 404, "", state, config, entered, body)
867 case Router.MethodMissing{ids, allow}:
868 policies = groups.prepared(~Policy<H>, groups, ids)
869 scopes(~S, ~K, ~E, ~H, ~before_hook, ~after_hook, ~mapper, policies, state, config, meta, entered, body,
870 s => entered => b => framework(~S, ~K, ~E, ~H, ~mapper, 405, allow, s, config, entered, b))
871 case Router.Options{ids, allow}:
872 policies = groups.prepared(~Policy<H>, groups, ids)
873 scopes(~S, ~K, ~E, ~H, ~before_hook, ~after_hook, ~mapper, policies, state, config, meta, entered, body,
874 s => entered => b => framework(~S, ~K, ~E, ~H, ~mapper, 204, allow, s, config, entered, b))
875 case Router.Found{Endpoint{action, +policies}, params, ids, method, pattern}:
876 selected = {Match{target, params, ids, method, pattern, policies} : Match<Policy<H>>}
877 scopes(~S, ~K, ~E, ~H, ~before_hook, ~after_hook, ~mapper, policies.tail(~H, policies), state, config, meta, entered, body,
878 s => entered => b => endpoint(~A, ~S, ~K, ~E, ~H, ~run, ~mapper, action, s, config, selected, meta, entered, b))
879
880def metadata.authority(authority: Maybe<&2, String>, meta: Metadata) -> Metadata:
881 match authority:
882 case None{}:
883 meta
884 case Some{host}:
885 Metadata{method, target, headers} = meta
886 Metadata{method, target, Http.set(headers, "host", host)}
887
888def resolved(~A: Data, ~S: Type, ~K: Data, ~E: Data, ~H: Data,
889 ~before_hook: H -> S -> K -> Metadata -> IO(Step<S, E>),
890 ~after_hook: H -> S -> K -> Http.Res -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
891 ~run: A -> S -> K -> Match<Policy<H>> -> Http.Req -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
892 ~mapper: S -> K -> Error<E> -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
893 outcome: Result<&2, &2, Router.Error, Router.Resolved<Endpoint<A, Policy<H>>>>,
894 groups: List<&2, GroupPlan<Policy<H>>>, state: S, config: K, meta: Metadata, entered: List<&2, Policy<H>>, body: Http.Body
895) -> IO(Completion<S, H>):
896 match outcome:
897 case Fail{error}:
898 framework(~S, ~K, ~E, ~H, ~mapper, 400, "", state, config, entered, body)
899 case Done{Router.Resolved{+target, selected}}:
900 Target.Target{segments, query, authority, star} = target
901 choice(~A, ~S, ~K, ~E, ~H, ~before_hook, ~after_hook, ~run, ~mapper, selected, target, groups, state, config, metadata.authority(authority, meta), entered, body)
902
903def dispatch.application(~A: Data, ~S: Type, ~K: Data, ~E: Data, ~H: Data,
904 ~before_hook: H -> S -> K -> Metadata -> IO(Step<S, E>),
905 ~after_hook: H -> S -> K -> Http.Res -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
906 ~run: A -> S -> K -> Match<Policy<H>> -> Http.Req -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
907 ~mapper: S -> K -> Error<E> -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
908 app: Application<A, K, Policy<H>>, state: S, req: Http.Req
909) -> IO(Completion<S, H>):
910 Application{table, +config, root, groups} = app
911 Http.Req{+method, +path, +headers, body} = req
912 +meta = {Metadata{method, path, headers} : Metadata}
913 do IO<Completion<S, H>>:
914 completion : Completion<S, H> <- scopes(~S, ~K, ~E, ~H, ~before_hook, ~after_hook, ~mapper, [root], state, config, meta, Nil{}, body,
915 s => entered => b => resolved(~A, ~S, ~K, ~E, ~H, ~before_hook, ~after_hook, ~run, ~mapper,
916 Router.resolve(~Endpoint<A, Policy<H>>, table, method, path), groups, s, config, meta, entered, b))
917 finish(~S, ~K, ~E, ~H, ~mapper, config, completion)
918
919def access.disabled(~K: Data, config: K) -> Notices.Access:
920 Notices.Disabled{}
921
922def notice.ignore(~N: Data, ~H: Data, ~E: Data, observer: N, policy: Policy<H>, notice: Notices.Notice) -> IO(Result<&2, &2, E, Unit>):
923 IO.pure(Result<&2, &2, E, Unit>, Done{Unit{}})
924
925def notice.error.ignore(~N: Data, ~E: Data, observer: N, error: E) -> IO(Unit):
926 IO.pure(Unit, Unit{})
927
928def notice.result(~N: Data, ~E: Data, ~report: N -> E -> IO(Unit), observer: N, result: Result<&2, &2, E, Unit>) -> IO(Unit):
929 match result:
930 case Done{unit}: IO.pure(Unit, Unit{})
931 case Fail{error}: report(observer, error)
932
933def notices(~N: Data, ~H: Data, ~E: Data,
934 ~notify: N -> Policy<H> -> Notices.Notice -> IO(Result<&2, &2, E, Unit>),
935 ~report: N -> E -> IO(Unit),
936 entered: List<&2, Policy<H>>, +observer: N, +notice: Notices.Notice
937) -> IO(Unit):
938 match entered:
939 case Nil{}: IO.pure(Unit, Unit{})
940 case policy <> rest:
941 do IO<Unit>:
942 result : Result<&2, &2, E, Unit> <- notify(observer, policy, notice)
943 notice.result(~N, ~E, ~report, observer, result)
944 notices(~N, ~H, ~E, ~notify, ~report, rest, observer, notice)
945
946def dispatch.completed(~S: Type, ~N: Data, ~H: Data, ~E: Data,
947 ~notify: N -> Policy<H> -> Notices.Notice -> IO(Result<&2, &2, E, Unit>),
948 ~report: N -> E -> IO(Unit),
949 observer: N, access: Notices.Access, started: Time.Duration, completion: Completion<S, H>
950) -> IO(Completion<S, H>):
951 Completed{state, Http.Res{+status, headers, body}, +entered, +mapped, +stopped} = completion
952 do IO<Completion<S, H>>:
953 ended : Time.Duration <- Time.mono()
954 +notice : Notices.Notice = Notices.Notice{status, Time.Duration.sub(ended, started), mapped, stopped, Notices.ApplicationOnly{}}
955 notices(~N, ~H, ~E, ~notify, ~report, entered, observer, notice)
956 Notices.access(access, notice)
957 return Completed{state, Http.Res{status, headers, body}, entered, mapped, stopped}
958
959# The same application pipeline is used live; only this boundary emits direct notices.
960def dispatch(~A: Data, ~S: Type, ~K: Data, ~E: Data, ~H: Data, ~N: Data,
961 ~before_hook: H -> S -> K -> Metadata -> IO(Step<S, E>),
962 ~after_hook: H -> S -> K -> Http.Res -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
963 ~run: A -> S -> K -> Match<Policy<H>> -> Http.Req -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
964 ~mapper: S -> K -> Error<E> -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
965 ~notify: N -> Policy<H> -> Notices.Notice -> IO(Result<&2, &2, E, Unit>),
966 ~report: N -> E -> IO(Unit),
967 observer: N, access: Notices.Access, app: Application<A, K, Policy<H>>, state: S, req: Http.Req
968) -> IO(Completion<S, H>):
969 do IO<Completion<S, H>>:
970 started : Time.Duration <- Time.mono()
971 completion : Completion<S, H> <- dispatch.application(~A, ~S, ~K, ~E, ~H, ~before_hook, ~after_hook, ~run, ~mapper, app, state, req)
972 dispatch.completed(~S, ~N, ~H, ~E, ~notify, ~report, observer, access, started, completion)
973
974# The wrapper owns both pipes until its admitted operation really returns.
975# Only disposable HTTP packed buffers cross them, never external handles.
976type BufferedRequest is Data:
977 BufferedRequest{metadata: Metadata, body: Chan(Http.Body), response: Chan(Http.Res)}
978
979type ApplicationReport<-H: Data> is Data:
980 Dispatched{entered: List<&2, Policy<H>>, mapped: Bool, stopped: Bool}
981 CapacityRejected{}
982
983type ServingContext<-A: Data, -S: Type, -K: Data, -H: Data> is Data:
984 ServingContext{application: Application<A, K, Policy<H>>,
985 owner: Context<S, Application<A, K, Policy<H>>, BufferedRequest, Unit, ApplicationReport<H>>}
986
987type Server<-A: Data, -S: Type, -K: Data, -H: Data> is Type:
988 Server{transport: Http.Server<ServingContext<A, S, K, H>>,
989 owner: Owner<S, Application<A, K, Policy<H>>, BufferedRequest, Unit, ApplicationReport<H>>}
990
991type StartupError is Data:
992 RegistrationFailed{error: RegistrationError}
993 TransportFailed{error: Http.StartupError}
994 EmptyBundles{}
995
996type ServerExit<-A: Data, -S: Type, -K: Data, -H: Data> is Type:
997 ServerExit{transport: Http.ServerExit, application: OwnerClose<S, Application<A, K, Policy<H>>, BufferedRequest, Unit, ApplicationReport<H>>}
998
999def server.config(port: U32) -> Http.ServerConfig:
1000 Http.ServerConfig{"127.0.0.1", port, 1048576, 65536, 128, 128, 128, 5000, 30000, 30000, 30000}
1001
1002def server.bundles.cons(~S: Type, resource: S, counted: List<S> & Nat) -> List<S> & Nat:
1003 (returned, count) = counted
1004 (resource <> returned, 1n+count)
1005
1006def server.bundles(~S: Type, resources: List<S>) -> List<S> & Nat:
1007 match resources:
1008 case Nil{}: (Nil{}, 0n)
1009 case resource <> rest:
1010 server.bundles.cons(~S, resource, server.bundles(~S, rest))
1011
1012def server.work.completed(~S: Type, ~H: Data, response_channel: Chan(Http.Res),
1013 completion: Completion<S, H>
1014) -> IO(S & Result<&2, &2, Unit, ApplicationReport<H>>):
1015 Completed{state, response, entered, mapped, stopped} = completion
1016 do IO<S & Result<&2, &2, Unit, ApplicationReport<H>>>:
1017 sent : Result<&1, &1, Http.Res, Unit> <- Chan.send(Http.Res, response_channel, response)
1018 return (state, Done{Dispatched{entered, mapped, stopped}})
1019
1020def server.work(~A: Data, ~S: Type, ~K: Data, ~E: Data, ~H: Data,
1021 ~before_hook: H -> S -> K -> Metadata -> IO(Step<S, E>),
1022 ~after_hook: H -> S -> K -> Http.Res -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
1023 ~run: A -> S -> K -> Match<Policy<H>> -> Http.Req -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
1024 ~mapper: S -> K -> Error<E> -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
1025 state: S, app: Application<A, K, Policy<H>>, input: BufferedRequest
1026) -> IO(S & Result<&2, &2, Unit, ApplicationReport<H>>):
1027 BufferedRequest{Metadata{method, target, headers}, body_channel, response_channel} = input
1028 do IO<S & Result<&2, &2, Unit, ApplicationReport<H>>>:
1029 body : Http.Body <- receive(Http.Body, body_channel)
1030 completion : Completion<S, H> <- dispatch.application(~A, ~S, ~K, ~E, ~H, ~before_hook, ~after_hook, ~run, ~mapper,
1031 app, state, Http.Req{method, target, headers, body})
1032 server.work.completed(~S, ~H, response_channel, completion)
1033
1034type NoticePayload<-K: Data, -H: Data> is Data:
1035 NoticePayload{config: K, started: Time.Duration, application: ApplicationReport<H>}
1036
1037def server.notified(~K: Data, ~H: Data, ~E: Data,
1038 ~notify: K -> Policy<H> -> Notices.Notice -> IO(Result<&2, &2, E, Unit>),
1039 ~report: K -> E -> IO(Unit), ~access: K -> Notices.Access,
1040 ~done: TransportCompletion.Completion<ApplicationReport<H>> -> IO(Unit),
1041 +config: K, +notice: Notices.Notice, application: ApplicationReport<H>,
1042 status: U32, outcome: TransportCompletion.Outcome
1043) -> IO(Unit):
1044 match application:
1045 case Dispatched{+entered, +mapped, +stopped}:
1046 do IO<Unit>:
1047 notices(~K, ~H, ~E, ~notify, ~report, entered, config, notice)
1048 Notices.access(access(config), notice)
1049 done(TransportCompletion.Completion{Dispatched{entered, mapped, stopped}, status, outcome})
1050 case CapacityRejected{}:
1051 do IO<Unit>:
1052 Notices.access(access(config), notice)
1053 done(TransportCompletion.Completion{CapacityRejected{}, status, outcome})
1054
1055def server.completed.report(~K: Data, ~H: Data, ~E: Data,
1056 ~notify: K -> Policy<H> -> Notices.Notice -> IO(Result<&2, &2, E, Unit>),
1057 ~report: K -> E -> IO(Unit), ~access: K -> Notices.Access,
1058 ~done: TransportCompletion.Completion<ApplicationReport<H>> -> IO(Unit),
1059 config: K, duration: Time.Duration, application: ApplicationReport<H>, +status: U32, +outcome: TransportCompletion.Outcome
1060) -> IO(Unit):
1061 match application:
1062 case Dispatched{+entered, +mapped, +stopped}:
1063 server.notified(~K, ~H, ~E, ~notify, ~report, ~access, ~done, config,
1064 Notices.Notice{status, duration, mapped, stopped, Notices.Transport{outcome}}, Dispatched{entered, mapped, stopped}, status, outcome)
1065 case CapacityRejected{}:
1066 server.notified(~K, ~H, ~E, ~notify, ~report, ~access, ~done, config,
1067 Notices.Notice{status, duration, False{}, False{}, Notices.Transport{outcome}}, CapacityRejected{}, status, outcome)
1068
1069def server.completed(~K: Data, ~H: Data, ~E: Data,
1070 ~notify: K -> Policy<H> -> Notices.Notice -> IO(Result<&2, &2, E, Unit>),
1071 ~report: K -> E -> IO(Unit), ~access: K -> Notices.Access,
1072 ~done: TransportCompletion.Completion<ApplicationReport<H>> -> IO(Unit),
1073 completion: TransportCompletion.Completion<NoticePayload<K, H>>
1074) -> IO(Unit):
1075 TransportCompletion.Completion{NoticePayload{config, started, +application}, +status, +outcome} = completion
1076 do IO<Unit>:
1077 ended : Time.Duration <- Time.mono()
1078 server.completed.report(~K, ~H, ~E, ~notify, ~report, ~access, ~done, config, Time.Duration.sub(ended, started), application, status, outcome)
1079
1080def server.response(~K: Data, ~H: Data,
1081 ~done: TransportCompletion.Completion<NoticePayload<K, H>> -> IO(Unit),
1082 config: K, started: Time.Duration, outcome: Outcome<Unit, ApplicationReport<H>>, +body: Chan(Http.Body), +response: Chan(Http.Res)
1083) -> IO(Http.Reply):
1084 match outcome:
1085 case Success{report}:
1086 do IO<Http.Reply>:
1087 result : Http.Res <- receive(Http.Res, response)
1088 Chan.close(Http.Body, body)
1089 Chan.close(Http.Res, response)
1090 return Http.reply.complete(~NoticePayload<K, H>, ~done, NoticePayload{config, started, report}, result)
1091 case _:
1092 do IO<Http.Reply>:
1093 # Closing alone retains buffered values in Base. Consume the rejected
1094 # body before closing; the single room1 send has already completed.
1095 discarded : Http.Body <- receive(Http.Body, body)
1096 Chan.close(Http.Body, body)
1097 Chan.close(Http.Res, response)
1098 return Http.reply.complete(~NoticePayload<K, H>, ~done, NoticePayload{config, started, CapacityRejected{}},
1099 Http.Res{503, Http.set(Http.empty(), "connection", "close"), Http.from_string("")})
1100
1101def server.handle(~A: Data, ~S: Type, ~K: Data, ~H: Data,
1102 ~done: TransportCompletion.Completion<NoticePayload<K, H>> -> IO(Unit),
1103 context: ServingContext<A, S, K, H>, req: Http.Req
1104) -> IO(Http.Reply):
1105 ServingContext{+app, owner} = context
1106 Application{table, config, root, groups} = app
1107 Http.Req{method, target, headers, body} = req
1108 do IO<Http.Reply>:
1109 started : Time.Duration <- Time.mono()
1110 +body_channel : Chan(Http.Body) <- Chan.new(Http.Body, 1)
1111 +response_channel : Chan(Http.Res) <- Chan.new(Http.Res, 1)
1112 sent : Result<&1, &1, Http.Body, Unit> <- Chan.send(Http.Body, body_channel, body)
1113 outcome : Outcome<Unit, ApplicationReport<H>> <- call(S, Application<A, K, Policy<H>>, BufferedRequest, Unit, ApplicationReport<H>,
1114 owner, app, BufferedRequest{Metadata{method, target, headers}, body_channel, response_channel})
1115 server.response(~K, ~H, ~done, config, started, outcome, body_channel, response_channel)
1116
1117
1118def server.started(~A: Data, ~S: Type, ~K: Data, ~H: Data,
1119 ~work: S -> Application<A, K, Policy<H>> -> BufferedRequest -> IO(S & Result<&2, &2, Unit, ApplicationReport<H>>),
1120 ~destroy: S -> IO(Unit),
1121 +context: Context<S, Application<A, K, Policy<H>>, BufferedRequest, Unit, ApplicationReport<H>>,
1122 room: U32, capacity: Nat,
1123 started: List<S> & Result<&2, &1, Http.StartupError, Http.Server<ServingContext<A, S, K, H>>>
1124) -> IO(Result<&2, &1, StartupError, Server<A, S, K, H>>):
1125 Context{+messages} = context
1126 (resources, result) = started
1127 match result:
1128 case Fail{error}:
1129 do IO<Result<&2, &1, StartupError, Server<A, S, K, H>>>:
1130 dispose(~S, ~destroy, resources)
1131 Chan.close(Message<S, Application<A, K, Policy<H>>, BufferedRequest, Unit, ApplicationReport<H>>, messages)
1132 return Fail{TransportFailed{error}}
1133 case Done{transport}:
1134 do IO<Result<&2, &1, StartupError, Server<A, S, K, H>>>:
1135 finished : Chan(Unit) <- IO.fork(Unit, owner(~S, ~Application<A, K, Policy<H>>, ~BufferedRequest, ~Unit, ~ApplicationReport<H>,
1136 ~work, ~destroy, messages, room, Waiting{resources, ledger.open(capacity)}))
1137 return Done{Server{transport, Owner{Context{messages}, finished}}}
1138
1139def server.prepared(~A: Data, ~S: Type, ~K: Data, ~H: Data,
1140 ~work: S -> Application<A, K, Policy<H>> -> BufferedRequest -> IO(S & Result<&2, &2, Unit, ApplicationReport<H>>),
1141 ~destroy: S -> IO(Unit), app: Application<A, K, Policy<H>>, +config: Http.ServerConfig, resources: List<S> & Nat
1142) -> IO(Result<&2, &1, StartupError, Server<A, S, K, H>>):
1143 Http.ServerConfig{host, port, body, headers, connections, requests, +buffered, hm, bm, im, wm} = config
1144 (bundles, capacity) = resources
1145 match capacity:
1146 case 0n:
1147 do IO<Result<&2, &1, StartupError, Server<A, S, K, H>>>:
1148 dispose(~S, ~destroy, bundles)
1149 return Fail{EmptyBundles{}}
1150 case 1n+ +rest:
1151 do IO<Result<&2, &1, StartupError, Server<A, S, K, H>>>:
1152 messages : Chan(Message<S, Application<A, K, Policy<H>>, BufferedRequest, Unit, ApplicationReport<H>>) <-
1153 Chan.new(Message<S, Application<A, K, Policy<H>>, BufferedRequest, Unit, ApplicationReport<H>>, buffered)
1154 +context : Context<S, Application<A, K, Policy<H>>, BufferedRequest, Unit, ApplicationReport<H>> = Context{messages}
1155 started : List<S> & Result<&2, &1, Http.StartupError, Http.Server<ServingContext<A, S, K, H>>> <-
1156 Http.server.start(~ServingContext<A, S, K, H>, ~List<S>, ServingContext{app, context}, bundles, config)
1157 server.started(~A, ~S, ~K, ~H, ~work, ~destroy, context, buffered, 1n+rest, started)
1158
1159def server.valid(~A: Data, ~S: Type, ~K: Data, ~H: Data,
1160 ~work: S -> Application<A, K, Policy<H>> -> BufferedRequest -> IO(S & Result<&2, &2, Unit, ApplicationReport<H>>),
1161 ~destroy: S -> IO(Unit), valid: Bool, app: Application<A, K, Policy<H>>, config: Http.ServerConfig, resources: List<S>
1162) -> IO(Result<&2, &1, StartupError, Server<A, S, K, H>>):
1163 match valid:
1164 case False{}:
1165 do IO<Result<&2, &1, StartupError, Server<A, S, K, H>>>:
1166 dispose(~S, ~destroy, resources)
1167 return Fail{TransportFailed{Http.InvalidConfig{}}}
1168 case True{}:
1169 server.prepared(~A, ~S, ~K, ~H, ~work, ~destroy, app, config, server.bundles(~S, resources))
1170
1171def server.registered(~A: Data, ~S: Type, ~K: Data, ~H: Data,
1172 ~work: S -> Application<A, K, Policy<H>> -> BufferedRequest -> IO(S & Result<&2, &2, Unit, ApplicationReport<H>>),
1173 ~destroy: S -> IO(Unit), registration: Result<&2, &2, RegistrationError, Application<A, K, Policy<H>>>,
1174 +config: Http.ServerConfig, resources: List<S>
1175) -> IO(Result<&2, &1, StartupError, Server<A, S, K, H>>):
1176 match registration:
1177 case Fail{error}:
1178 do IO<Result<&2, &1, StartupError, Server<A, S, K, H>>>:
1179 dispose(~S, ~destroy, resources)
1180 return Fail{RegistrationFailed{error}}
1181 case Done{app}:
1182 server.valid(~A, ~S, ~K, ~H, ~work, ~destroy, Http.server.config.valid(config), app, config, resources)
1183
1184def server.start(~A: Data, ~S: Type, ~K: Data, ~E: Data, ~H: Data,
1185 ~before_hook: H -> S -> K -> Metadata -> IO(Step<S, E>),
1186 ~after_hook: H -> S -> K -> Http.Res -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
1187 ~run: A -> S -> K -> Match<Policy<H>> -> Http.Req -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
1188 ~mapper: S -> K -> Error<E> -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
1189 ~destroy: S -> IO(Unit),
1190 registration: Result<&2, &2, RegistrationError, Application<A, K, Policy<H>>>,
1191 config: Http.ServerConfig, resources: List<S>
1192) -> IO(Result<&2, &1, StartupError, Server<A, S, K, H>>):
1193 server.registered(~A, ~S, ~K, ~H,
1194 ~(state => app => input => server.work(~A, ~S, ~K, ~E, ~H, ~before_hook, ~after_hook, ~run, ~mapper, state, app, input)),
1195 ~destroy, registration, config, resources)
1196
1197def server.control.result(~A: Data, ~S: Type, ~K: Data, ~H: Data,
1198 controlled: Http.Server<ServingContext<A, S, K, H>> & Http.ServerControl,
1199 owner: Owner<S, Application<A, K, Policy<H>>, BufferedRequest, Unit, ApplicationReport<H>>
1200) -> Server<A, S, K, H> & Http.ServerControl:
1201 (returned, control) = controlled
1202 (Server{returned, owner}, control)
1203
1204def server.control(~A: Data, ~S: Type, ~K: Data, ~H: Data, server: Server<A, S, K, H>) -> Server<A, S, K, H> & Http.ServerControl:
1205 Server{transport, owner} = server
1206 server.control.result(~A, ~S, ~K, ~H, Http.server.control(~ServingContext<A, S, K, H>, transport), owner)
1207
1208def server.observer.result(~A: Data, ~S: Type, ~K: Data, ~H: Data,
1209 observed: Http.Server<ServingContext<A, S, K, H>> & Http.ServerStats,
1210 owner: Owner<S, Application<A, K, Policy<H>>, BufferedRequest, Unit, ApplicationReport<H>>
1211) -> Server<A, S, K, H> & Http.ServerStats:
1212 (returned, stats) = observed
1213 (Server{returned, owner}, stats)
1214
1215def server.observer(~A: Data, ~S: Type, ~K: Data, ~H: Data, server: Server<A, S, K, H>) -> Server<A, S, K, H> & Http.ServerStats:
1216 Server{transport, owner} = server
1217 server.observer.result(~A, ~S, ~K, ~H, Http.server.observer(~ServingContext<A, S, K, H>, transport), owner)
1218
1219def server.dependencies(~A: Data, ~S: Type, ~K: Data, ~H: Data, server: Server<A, S, K, H>
1220) -> Server<A, S, K, H> & Context<S, Application<A, K, Policy<H>>, BufferedRequest, Unit, ApplicationReport<H>>:
1221 Server{transport, Owner{+context, finished}} = server
1222 (Server{transport, Owner{context, finished}}, context)
1223
1224def server.run(~A: Data, ~S: Type, ~K: Data, ~H: Data, ~E: Data,
1225 ~done: TransportCompletion.Completion<ApplicationReport<H>> -> IO(Unit),
1226 ~observe: U32 -> TransportCompletion.Outcome -> IO(Unit),
1227 ~notify: K -> Policy<H> -> Notices.Notice -> IO(Result<&2, &2, E, Unit>),
1228 ~report: K -> E -> IO(Unit), ~access: K -> Notices.Access,
1229 server: Server<A, S, K, H>
1230) -> IO(ServerExit<A, S, K, H>):
1231 Server{transport, owner} = server
1232 do IO<ServerExit<A, S, K, H>>:
1233 exited : Http.ServerExit <- Http.server.run(~ServingContext<A, S, K, H>,
1234 ~(context => req => server.handle(~A, ~S, ~K, ~H,
1235 ~(completion => server.completed(~K, ~H, ~E, ~notify, ~report, ~access, ~done, completion)), context, req)),
1236 ~(context => status => outcome => observe(status, outcome)), transport)
1237 closed : OwnerClose<S, Application<A, K, Policy<H>>, BufferedRequest, Unit, ApplicationReport<H>> <- close(S, Application<A, K, Policy<H>>, BufferedRequest, Unit, ApplicationReport<H>, owner)
1238 return ServerExit{exited, closed}
1239
1240# Without starting the run loop, the caller still explicitly drains transport
1241# and joins application cleanup. A stop request alone is never completion.
1242def server.close(~A: Data, ~S: Type, ~K: Data, ~H: Data, server: Server<A, S, K, H>) -> IO(ServerExit<A, S, K, H>):
1243 Server{transport, owner} = server
1244 do IO<ServerExit<A, S, K, H>>:
1245 counts : Http.ServerCounts <- Http.server.close(~ServingContext<A, S, K, H>, transport)
1246 closed : OwnerClose<S, Application<A, K, Policy<H>>, BufferedRequest, Unit, ApplicationReport<H>> <- close(S, Application<A, K, Policy<H>>, BufferedRequest, Unit, ApplicationReport<H>, owner)
1247 return ServerExit{Http.ServerStopped{counts}, closed}
1248
1249def serve.started(~A: Data, ~S: Type, ~K: Data, ~H: Data, ~E: Data,
1250 ~done: TransportCompletion.Completion<ApplicationReport<H>> -> IO(Unit),
1251 ~observe: U32 -> TransportCompletion.Outcome -> IO(Unit),
1252 ~notify: K -> Policy<H> -> Notices.Notice -> IO(Result<&2, &2, E, Unit>),
1253 ~report: K -> E -> IO(Unit), ~access: K -> Notices.Access,
1254 started: Result<&2, &1, StartupError, Server<A, S, K, H>>
1255) -> IO(Result<&2, &1, StartupError, ServerExit<A, S, K, H>>):
1256 match started:
1257 case Fail{error}: IO.pure(Result<&2, &1, StartupError, ServerExit<A, S, K, H>>, Fail{error})
1258 case Done{server}:
1259 do IO<Result<&2, &1, StartupError, ServerExit<A, S, K, H>>>:
1260 exited : ServerExit<A, S, K, H> <- server.run(~A, ~S, ~K, ~H, ~E, ~done, ~observe, ~notify, ~report, ~access, server)
1261 return Done{exited}
1262
1263# Owners that need readiness/control use server.start then server.run instead.
1264def serve(~A: Data, ~S: Type, ~K: Data, ~E: Data, ~H: Data,
1265 ~before_hook: H -> S -> K -> Metadata -> IO(Step<S, E>),
1266 ~after_hook: H -> S -> K -> Http.Res -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
1267 ~run: A -> S -> K -> Match<Policy<H>> -> Http.Req -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
1268 ~mapper: S -> K -> Error<E> -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
1269 ~destroy: S -> IO(Unit),
1270 ~done: TransportCompletion.Completion<ApplicationReport<H>> -> IO(Unit),
1271 ~observe: U32 -> TransportCompletion.Outcome -> IO(Unit),
1272 ~notify: K -> Policy<H> -> Notices.Notice -> IO(Result<&2, &2, E, Unit>),
1273 ~report: K -> E -> IO(Unit), ~access: K -> Notices.Access,
1274 registration: Result<&2, &2, RegistrationError, Application<A, K, Policy<H>>>,
1275 config: Http.ServerConfig, resources: List<S>
1276) -> IO(Result<&2, &1, StartupError, ServerExit<A, S, K, H>>):
1277 do IO<Result<&2, &1, StartupError, ServerExit<A, S, K, H>>>:
1278 started : Result<&2, &1, StartupError, Server<A, S, K, H>> <-
1279 server.start(~A, ~S, ~K, ~E, ~H, ~before_hook, ~after_hook, ~run, ~mapper, ~destroy, registration, config, resources)
1280 serve.started(~A, ~S, ~K, ~H, ~E, ~done, ~observe, ~notify, ~report, ~access, started)