camber.bend
bend-kit-camber@0.7.0.0 · 1,211 lines · 0 definitions
1# Fixed prepared HTTP applications and bounded affine dependency bundles.
2import Base
3import bend-kit-http@0.32.0.0/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@0.5.1.0/json.bend as Json
7import bend-kit-camber@0.7.0.0/response.bend as Response
8import bend-kit-camber@0.7.0.0/input.bend as Input
9import bend-kit-http@0.32.0.0/completion.bend as TransportCompletion
10import bend-kit-camber@0.7.0.0/notices.bend as Notices
11import bend-kit-time@0.1.2.1/time.bend as Time
12
13type ResponseError is Data:
14 InvalidResponse{}
15 InvalidRedirect{}
16
17def validate.checked(valid: Bool, response: Http.Res) -> Result<&2, &1, ResponseError, Http.Res>:
18 match valid:
19 case True{}:
20 Done{response}
21 case False{}:
22 Fail{InvalidResponse{}}
23
24def validate(response: Http.Res) -> Result<&2, &1, ResponseError, Http.Res>:
25 Http.Res{+status, +headers, body} = response
26 validate.checked(Response.valid(status, headers), Http.Res{status, headers, body})
27
28# The encoder is an explicit public projection, never record reflection.
29def json(~T: Type, ~encode: T -> Json.Val, status: U32, value: T) -> Http.Res:
30 Http.Res{status, Http.set(Http.empty(), "content-type", "application/json"), Json.encode.bytes(encode(value))}
31
32def text(status: U32, value: String) -> Http.Res:
33 Http.Res{status, Http.set(Http.empty(), "content-type", "text/plain; charset=utf-8"), Json.utf8(value)}
34
35def raw(status: U32, body: Http.Body) -> Http.Res:
36 Http.Res{status, Http.empty(), body}
37
38def empty(status: U32) -> Http.Res:
39 raw(status, Http.from_string(""))
40
41def redirect.checked(valid: Bool, status: U32, location: String) -> Result<&2, &1, ResponseError, Http.Res>:
42 match valid:
43 case False{}:
44 Fail{InvalidRedirect{}}
45 case True{}:
46 Done{Http.Res{status, Http.set(Http.empty(), "location", location), Http.from_string("")}}
47
48def redirect(+status: U32, +location: String) -> Result<&2, &1, ResponseError, Http.Res>:
49 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)
50
51type Counts is Data:
52 Counts{capacity: Nat, in_use: Nat, completed: Nat, rejected: Nat}
53
54type Outcome<-E: Data, -O: Data> is Data:
55 Success{value: O}
56 Expected{error: E}
57 Exhausted{}
58 Stopped{}
59
60type CloseResult is Data:
61 Closed{}
62 Busy{counts: Counts}
63
64type Message<-R: Type, -P: Data, -I: Data, -E: Data, -O: Data> is Type:
65 Submit{principal: P, input: I, reply: Chan(Outcome<E, O>)}
66 Returned{resource: R}
67 Inspect{reply: Chan(Counts)}
68 Shutdown{reply: Chan(CloseResult)}
69
70# Copy only this context, never the resources. The inbox bounds queued commands;
71# callers must count blocked submissions inside their transport admission limit.
72type Context<-R: Type, -P: Data, -I: Data, -E: Data, -O: Data> is Data:
73 Context{messages: Chan(Message<R, P, I, E, O>)}
74
75# The completion future has one affine owner; request contexts copy only inbox.
76type Owner<-R: Type, -P: Data, -I: Data, -E: Data, -O: Data> is Type:
77 Owner{context: Context<R, P, I, E, O>, finished: Chan(Unit)}
78
79type OwnerClose<-R: Type, -P: Data, -I: Data, -E: Data, -O: Data> is Type:
80 OwnerClosed{}
81 OwnerBusy{owner: Owner<R, P, I, E, O>, counts: Counts}
82
83def owner.context(-R: Type, -P: Data, -I: Data, -E: Data, -O: Data,
84 owner: Owner<R, P, I, E, O>
85) -> Owner<R, P, I, E, O> & Context<R, P, I, E, O>:
86 Owner{+context, finished} = owner
87 (Owner{context, finished}, context)
88
89def outcome.value(-E: Data, -O: Data, result: Result<&2, &2, E, O>) -> Outcome<E, O>:
90 match result:
91 case Fail{error}:
92 Expected{error}
93 case Done{value}:
94 Success{value}
95
96def dispose(~R: Type, ~destroy: R -> IO(Unit), resources: List<R>) -> IO(Unit):
97 match resources:
98 case Nil{}:
99 IO.pure(Unit, Unit{})
100 case Con{resource, rest}:
101 do IO<Unit>:
102 destroy(resource)
103 dispose(~R, ~destroy, rest)
104
105# Closing Base channels retains buffered messages. Drain them and answer stopped
106# callers, rather than stranding accepted commands behind the close command.
107def drain.message(~R: Type, ~P: Data, ~I: Data, ~E: Data, ~O: Data,
108 ~destroy: R -> IO(Unit), message: Message<R, P, I, E, O>
109) -> IO(Unit):
110 match message:
111 case Submit{principal, input, reply}:
112 do IO<Unit>:
113 sent : Result<&1, &1, Outcome<E, O>, Unit> <- Chan.send(Outcome<E, O>, reply, Stopped{})
114 return Unit{}
115 case Inspect{reply}:
116 Chan.close(Counts, reply)
117 case Shutdown{reply}:
118 do IO<Unit>:
119 sent : Result<&1, &1, CloseResult, Unit> <- Chan.send(CloseResult, reply, Closed{})
120 return Unit{}
121 case Returned{resource}:
122 destroy(resource)
123
124# The resources return through the private owner protocol BEFORE a disposable
125# caller reply. A closed caller reply cannot erase a handle or strand capacity.
126def work.returned(~R: Type, ~P: Data, ~I: Data, ~E: Data, ~O: Data,
127 ~destroy: R -> IO(Unit), accepted: Result<&1, &1, Message<R, P, I, E, O>, Unit>
128) -> IO(Unit):
129 match accepted:
130 case Fail{message}:
131 drain.message(~R, ~P, ~I, ~E, ~O, ~destroy, message)
132 case Done{u}:
133 IO.pure(Unit, Unit{})
134
135def work.return(~R: Type, ~P: Data, ~I: Data, ~E: Data, ~O: Data,
136 ~destroy: R -> IO(Unit),
137 messages: Chan(Message<R, P, I, E, O>), reply: Chan(Outcome<E, O>),
138 result: R & Result<&2, &2, E, O>
139) -> IO(Unit):
140 (returned, outcome) = result
141 do IO<Unit>:
142 accepted : Result<&1, &1, Message<R, P, I, E, O>, Unit> <- Chan.send(Message<R, P, I, E, O>, messages, Returned{returned})
143 work.returned(~R, ~P, ~I, ~E, ~O, ~destroy, accepted)
144 sent : Result<&1, &1, Outcome<E, O>, Unit> <- Chan.send(Outcome<E, O>, reply, outcome.value(E, O, outcome))
145 return Unit{}
146
147def work(~R: Type, ~P: Data, ~I: Data, ~E: Data, ~O: Data,
148 ~handler: R -> P -> I -> IO(R & Result<&2, &2, E, O>), ~destroy: R -> IO(Unit),
149 resource: R, principal: P, input: I,
150 messages: Chan(Message<R, P, I, E, O>), reply: Chan(Outcome<E, O>)
151) -> IO(Unit):
152 do IO<Unit>:
153 result : R & Result<&2, &2, E, O> <- handler(resource, principal, input)
154 work.return(~R, ~P, ~I, ~E, ~O, ~destroy, messages, reply, result)
155
156def drain.step(~R: Type, ~P: Data, ~I: Data, ~E: Data, ~O: Data,
157 ~destroy: R -> IO(Unit), pending: Maybe<&1, Message<R, P, I, E, O>>,
158 next: Unit -> IO(Unit)
159) -> IO(Unit):
160 match pending:
161 case None{}:
162 IO.pure(Unit, Unit{})
163 case Some{message}:
164 do IO<Unit>:
165 drain.message(~R, ~P, ~I, ~E, ~O, ~destroy, message)
166 next(Unit{})
167
168# The closed inbox contains at most room buffered messages.
169def drain(~R: Type, ~P: Data, ~I: Data, ~E: Data, ~O: Data,
170 ~destroy: R -> IO(Unit), fuel: Nat, +messages: Chan(Message<R, P, I, E, O>)
171) -> IO(Unit):
172 match fuel:
173 case 0n:
174 IO.pure(Unit, Unit{})
175 case 1n+p:
176 do IO<Unit>:
177 pending : Maybe<&1, Message<R, P, I, E, O>> <- Chan.recv(Message<R, P, I, E, O>, messages)
178 drain.step(~R, ~P, ~I, ~E, ~O, ~destroy, pending, u => drain(~R, ~P, ~I, ~E, ~O, ~destroy, p, messages))
179
180type OwnerStep<-R: Type, -P: Data, -I: Data, -E: Data, -O: Data> is Type:
181 Waiting{resources: List<R>, counts: Counts}
182 Received{message: Message<R, P, I, E, O>, counts: Counts, resources: List<R>}
183
184# IO.join closes a one-shot channel; the owner inbox must remain reusable.
185def receive.value(-A: Type, value: Maybe<&1, A>) -> IO(A):
186 match value:
187 case None{}:
188 IO.die(A, 1, "camber internal channel closed unexpectedly")
189 case Some{message}:
190 IO.pure(A, message)
191
192def receive(-A: Type, channel: Chan(A)) -> IO(A):
193 do IO<A>:
194 value : Maybe<&1, A> <- Chan.recv(A, channel)
195 receive.value(A, value)
196
197# Only idle close ends this loop. Busy close never waits on a stalled handler.
198# @unsafe is solely the lifecycle receive loop, not a termination/proof claim.
199@unsafe def owner(~R: Type, ~P: Data, ~I: Data, ~E: Data, ~O: Data,
200 ~handler: R -> P -> I -> IO(R & Result<&2, &2, E, O>), ~destroy: R -> IO(Unit),
201 +messages: Chan(Message<R, P, I, E, O>), +room: U32, step: OwnerStep<R, P, I, E, O>
202) -> IO(Unit):
203 match step:
204 case Waiting{resources, counts}:
205 do IO<Unit>:
206 message : Message<R, P, I, E, O> <- receive(Message<R, P, I, E, O>, messages)
207 owner(~R, ~P, ~I, ~E, ~O, ~handler, ~destroy, messages, room, Received{message, counts, resources})
208 case Received{message, counts, resources}:
209 match message:
210 case Returned{resource}:
211 Counts{capacity, in_use, completed, rejected} = counts
212 owner(~R, ~P, ~I, ~E, ~O, ~handler, ~destroy, messages, room, Waiting{resource <> resources, Counts{capacity, Nat.sub(in_use, 1n), 1n+completed, rejected}})
213 case Inspect{reply}:
214 Counts{+capacity, +in_use, +completed, +rejected} = counts
215 do IO<Unit>:
216 sent : Result<&1, &1, Counts, Unit> <- Chan.send(Counts, reply, Counts{capacity, in_use, completed, rejected})
217 owner(~R, ~P, ~I, ~E, ~O, ~handler, ~destroy, messages, room, Waiting{resources, Counts{capacity, in_use, completed, rejected}})
218 case Shutdown{reply}:
219 Counts{+capacity, in_use, +completed, +rejected} = counts
220 match in_use:
221 case 0n:
222 do IO<Unit>:
223 dispose(~R, ~destroy, resources)
224 Chan.close(Message<R, P, I, E, O>, messages)
225 sent : Result<&1, &1, CloseResult, Unit> <- Chan.send(CloseResult, reply, Closed{})
226 drain(~R, ~P, ~I, ~E, ~O, ~destroy, U32.to_nat(room), messages)
227 case 1n+ +p:
228 do IO<Unit>:
229 sent : Result<&1, &1, CloseResult, Unit> <- Chan.send(CloseResult, reply, Busy{Counts{capacity, 1n+p, completed, rejected}})
230 owner(~R, ~P, ~I, ~E, ~O, ~handler, ~destroy, messages, room, Waiting{resources, Counts{capacity, 1n+p, completed, rejected}})
231 case Submit{principal, input, reply}:
232 Counts{capacity, in_use, completed, rejected} = counts
233 match resources:
234 case Nil{}:
235 do IO<Unit>:
236 sent : Result<&1, &1, Outcome<E, O>, Unit> <- Chan.send(Outcome<E, O>, reply, Exhausted{})
237 owner(~R, ~P, ~I, ~E, ~O, ~handler, ~destroy, messages, room, Waiting{Nil{}, Counts{capacity, in_use, completed, 1n+rejected}})
238 case Con{resource, rest}:
239 do IO<Unit>:
240 IO.spawn(Unit, work(~R, ~P, ~I, ~E, ~O, ~handler, ~destroy, resource, principal, input, messages, reply))
241 owner(~R, ~P, ~I, ~E, ~O, ~handler, ~destroy, messages, room, Waiting{rest, Counts{capacity, 1n+in_use, completed, rejected}})
242
243def build.step(~R: Type, ~E: Data, ~destroy: R -> IO(Unit),
244 result: Result<&2, &1, E, R>, resources: List<R>,
245 next: List<R> -> IO(Result<&2, &1, E, List<R>>)
246) -> IO(Result<&2, &1, E, List<R>>):
247 match result:
248 case Fail{error}:
249 do IO<Result<&2, &1, E, List<R>>>:
250 dispose(~R, ~destroy, resources)
251 return Fail{error}
252 case Done{resource}:
253 next(resource <> resources)
254
255def build(~K: Data, ~R: Type, ~E: Data, ~create: K -> Nat -> IO(Result<&2, &1, E, R>), ~destroy: R -> IO(Unit),
256 remaining: Nat, +config: K, resources: List<R>
257) -> IO(Result<&2, &1, E, List<R>>):
258 match remaining:
259 case 0n:
260 IO.pure(Result<&2, &1, E, List<R>>, Done{resources})
261 case 1n+ +p:
262 do IO<Result<&2, &1, E, List<R>>>:
263 result : Result<&2, &1, E, R> <- create(config, p)
264 build.step(~R, ~E, ~destroy, result, resources, next => build(~K, ~R, ~E, ~create, ~destroy, p, config, next))
265
266def start.ready(~R: Type, ~P: Data, ~I: Data, ~E: Data, ~O: Data,
267 ~handler: R -> P -> I -> IO(R & Result<&2, &2, E, O>), ~destroy: R -> IO(Unit),
268 capacity: Nat, +room: U32, result: Result<&2, &1, E, List<R>>
269) -> IO(Result<&2, &1, E, Owner<R, P, I, E, O>>):
270 match result:
271 case Fail{error}:
272 IO.pure(Result<&2, &1, E, Owner<R, P, I, E, O>>, Fail{error})
273 case Done{resources}:
274 do IO<Result<&2, &1, E, Owner<R, P, I, E, O>>>:
275 channel : Chan(Message<R, P, I, E, O>) <- Chan.new(Message<R, P, I, E, O>, room)
276 +messages : Chan(Message<R, P, I, E, O>) = channel
277 finished : Chan(Unit) <- IO.fork(Unit, owner(~R, ~P, ~I, ~E, ~O, ~handler, ~destroy, messages, room, Waiting{resources, Counts{capacity, 0n, 0n, 0n}}))
278 return Done{Owner{Context{messages}, finished}}
279
280# The initializer closes partial handles within a failed bundle; start closes
281# all prior whole bundles. No workers exist until the complete set opens.
282def start(~K: Data, ~R: Type, ~P: Data, ~I: Data, ~E: Data, ~O: Data,
283 ~create: K -> Nat -> IO(Result<&2, &1, E, R>),
284 ~handler: R -> P -> I -> IO(R & Result<&2, &2, E, O>), ~destroy: R -> IO(Unit),
285 config: K, +capacity: Nat, room: U32
286) -> IO(Result<&2, &1, E, Owner<R, P, I, E, O>>):
287 do IO<Result<&2, &1, E, Owner<R, P, I, E, O>>>:
288 result : Result<&2, &1, E, List<R>> <- build(~K, ~R, ~E, ~create, ~destroy, capacity, config, Nil{})
289 start.ready(~R, ~P, ~I, ~E, ~O, ~handler, ~destroy, capacity, room, result)
290
291def submit(-R: Type, -P: Data, -I: Data, -E: Data, -O: Data,
292 context: Context<R, P, I, E, O>, principal: P, input: I, reply: Chan(Outcome<E, O>)
293) -> IO(Result<&1, &1, Message<R, P, I, E, O>, Unit>):
294 Context{messages} = context
295 do IO<Result<&1, &1, Message<R, P, I, E, O>, Unit>>:
296 sent : Result<&1, &1, Message<R, P, I, E, O>, Unit> <- Chan.send(Message<R, P, I, E, O>, messages, Submit{principal, input, reply})
297 return sent
298
299def call.accepted(-T: Type, -E: Data, -O: Data, accepted: Result<&1, &1, T, Unit>, +reply: Chan(Outcome<E, O>)) -> IO(Outcome<E, O>):
300 match accepted:
301 case Fail{v}:
302 do IO<Outcome<E, O>>:
303 Chan.close(Outcome<E, O>, reply)
304 return Stopped{}
305 case Done{u}:
306 do IO<Outcome<E, O>>:
307 result : Outcome<E, O> <- IO.join(Outcome<E, O>, reply)
308 Chan.close(Outcome<E, O>, reply)
309 return result
310
311def call(-R: Type, -P: Data, -I: Data, -E: Data, -O: Data,
312 context: Context<R, P, I, E, O>, principal: P, input: I
313) -> IO(Outcome<E, O>):
314 do IO<Outcome<E, O>>:
315 channel : Chan(Outcome<E, O>) <- Chan.new(Outcome<E, O>, 1)
316 +reply : Chan(Outcome<E, O>) = channel
317 accepted : Result<&1, &1, Message<R, P, I, E, O>, Unit> <- submit(R, P, I, E, O, context, principal, input, reply)
318 call.accepted(Message<R, P, I, E, O>, E, O, accepted, reply)
319
320def inspect.value(value: Maybe<&1, Counts>) -> Maybe<&2, Counts>:
321 match value:
322 case None{}:
323 None{}
324 case Some{counts}:
325 Some{counts}
326
327def inspect.sent(-T: Type, sent: Result<&1, &1, T, Unit>, +reply: Chan(Counts)) -> IO(Maybe<&2, Counts>):
328 match sent:
329 case Fail{v}:
330 do IO<Maybe<&2, Counts>>:
331 Chan.close(Counts, reply)
332 return None{}
333 case Done{u}:
334 do IO<Maybe<&2, Counts>>:
335 value : Maybe<&1, Counts> <- Chan.recv(Counts, reply)
336 Chan.close(Counts, reply)
337 return inspect.value(value)
338
339def inspect(-R: Type, -P: Data, -I: Data, -E: Data, -O: Data, context: Context<R, P, I, E, O>) -> IO(Maybe<&2, Counts>):
340 Context{messages} = context
341 do IO<Maybe<&2, Counts>>:
342 channel : Chan(Counts) <- Chan.new(Counts, 1)
343 +reply : Chan(Counts) = channel
344 sent : Result<&1, &1, Message<R, P, I, E, O>, Unit> <- Chan.send(Message<R, P, I, E, O>, messages, Inspect{reply})
345 inspect.sent(Message<R, P, I, E, O>, sent, reply)
346
347def close.sent(-T: Type, sent: Result<&1, &1, T, Unit>, +reply: Chan(CloseResult)) -> IO(CloseResult):
348 match sent:
349 case Fail{v}:
350 do IO<CloseResult>:
351 Chan.close(CloseResult, reply)
352 return Closed{}
353 case Done{u}:
354 do IO<CloseResult>:
355 value : CloseResult <- IO.join(CloseResult, reply)
356 Chan.close(CloseResult, reply)
357 return value
358
359def close.join(-R: Type, -P: Data, -I: Data, -E: Data, -O: Data,
360 owner: Owner<R, P, I, E, O>
361) -> IO(OwnerClose<R, P, I, E, O>):
362 Owner{context, finished} = owner
363 do IO<OwnerClose<R, P, I, E, O>>:
364 IO.join(Unit, finished)
365 return OwnerClosed{}
366
367def close.completed(-R: Type, -P: Data, -I: Data, -E: Data, -O: Data,
368 result: CloseResult, owner: Owner<R, P, I, E, O>
369) -> IO(OwnerClose<R, P, I, E, O>):
370 match result:
371 case Closed{}:
372 close.join(R, P, I, E, O, owner)
373 case Busy{counts}:
374 IO.pure(OwnerClose<R, P, I, E, O>, OwnerBusy{owner, counts})
375
376# Stop external admissions before close. Busy preserves live context/capacity;
377# retry after admitted operations finish. Stalled operations remain observable.
378def 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>):
379 Owner{Context{+messages}, finished} = owner
380 do IO<OwnerClose<R, P, I, E, O>>:
381 channel : Chan(CloseResult) <- Chan.new(CloseResult, 1)
382 +reply : Chan(CloseResult) = channel
383 sent : Result<&1, &1, Message<R, P, I, E, O>, Unit> <- Chan.send(Message<R, P, I, E, O>, messages, Shutdown{reply})
384 result : CloseResult <- close.sent(Message<R, P, I, E, O>, sent, reply)
385 close.completed(R, P, I, E, O, result, Owner{Context{messages}, finished})
386
387# Policies are prepared Data, not callbacks. Later lifecycle stages can consume
388# these root-to-route declarations without splitting patterns or finding groups.
389type Group<-P: Data> is Data:
390 Group{id: U32, ancestors: List<&2, U32>, policy: P}
391
392type GroupPlan<-P: Data> is Data:
393 GroupPlan{ids: List<&2, U32>, policies: List<&2, P>}
394
395type Route<-A: Data, -P: Data> is Data:
396 Route{method: String, pattern: String, action: A, groups: List<&2, U32>, policy: P}
397
398type Endpoint<-A: Data, -P: Data> is Data:
399 Endpoint{action: A, policies: List<&2, P>}
400
401type Application<-A: Data, -C: Data, -P: Data> is Data:
402 Application{table: Router.Table<Endpoint<A, P>>, context: C, root: P, groups: List<&2, GroupPlan<P>>}
403
404type RegistrationError is Data:
405 RouteError{error: Router.Error}
406 InvalidGroups{groups: List<&2, U32>}
407
408type Match<-P: Data> is Data:
409 Match{target: Target.Target, params: Map<&2, String>, groups: List<&2, U32>, method: String, pattern: String, policies: List<&2, P>}
410
411def groups.equal(xs: List<&2, U32>, ys: List<&2, U32>) -> Bool:
412 match xs ys:
413 case Nil{} Nil{}:
414 True{}
415 case x <> xt y <> yt:
416 U32.is_eq(x, y) && groups.equal(xt, yt)
417 case _ _:
418 False{}
419
420def group.pick(~P: Data, same: Bool, group: Group<P>, later: Unit -> Maybe<&2, Group<P>>) -> Maybe<&2, Group<P>>:
421 match same:
422 case True{}:
423 Some{group}
424 case False{}:
425 later(Unit{})
426
427def group.find(~P: Data, groups: List<&2, Group<P>>, +id: U32) -> Maybe<&2, Group<P>>:
428 match groups:
429 case Nil{}:
430 None{}
431 case Group{+here, ancestors, policy} <> rest:
432 group.pick(~P, U32.is_eq(here, id), Group{here, ancestors, policy}, u => group.find(~P, rest, id))
433
434def group.checked(~P: Data, same: Bool, policy: P) -> Maybe<&2, P>:
435 match same:
436 case False{}:
437 None{}
438 case True{}:
439 Some{policy}
440
441def group.policy(~P: Data, found: Maybe<&2, Group<P>>, ancestors: List<&2, U32>) -> Maybe<&2, P>:
442 match found:
443 case None{}:
444 None{}
445 case Some{Group{id, expected, policy}}:
446 group.checked(~P, groups.equal(expected, ancestors), policy)
447
448def groups.policies(~P: Data, ids: List<&2, U32>, +declared: List<&2, Group<P>>, +ancestors: List<&2, U32>) -> Maybe<&2, List<&2, P>>:
449 match ids:
450 case Nil{}:
451 Some{Nil{}}
452 case +id <> rest:
453 do Maybe<&2, List<&2, P>>:
454 policy : P <- group.policy(~P, group.find(~P, declared, id), ancestors)
455 policies : List<&2, P> <- groups.policies(~P, rest, declared, List.append(&2, U32, ancestors, [id]))
456 return policy <> policies
457
458def groups.unique(~P: Data, found: Maybe<&2, Group<P>>) -> Bool:
459 match found:
460 case None{}:
461 True{}
462 case Some{group}:
463 False{}
464
465def groups.valid(~P: Data, groups: List<&2, Group<P>>, +all: List<&2, Group<P>>) -> Bool:
466 match groups:
467 case Nil{}:
468 True{}
469 case Group{+id, +ancestors, policy} <> +rest:
470 chain = groups.policies(~P, List.append(&2, U32, ancestors, [id]), all, Nil{})
471 groups.unique(~P, group.find(~P, rest, id)) && Maybe.is_some(&2, List<&2, P>, chain) && groups.valid(~P, rest, all)
472
473def routes.policies(~P: Data, result: Maybe<&2, List<&2, P>>, ids: List<&2, U32>) -> Result<&2, &2, RegistrationError, List<&2, P>>:
474 match result:
475 case None{}:
476 Fail{InvalidGroups{ids}}
477 case Some{policies}:
478 Done{policies}
479
480def 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>>>>:
481 match routes:
482 case Nil{}:
483 Done{Nil{}}
484 case Route{method, pattern, action, +ids, policy} <> rest:
485 do Result<&2, &2, RegistrationError, List<&2, Router.Entry<Endpoint<A, P>>>>:
486 policies : List<&2, P> <- routes.policies(~P, groups.policies(~P, ids, groups, Nil{}), ids)
487 entries : List<&2, Router.Entry<Endpoint<A, P>>> <- routes.prepare(~A, ~P, rest, groups, root)
488 return Router.Entry{method, pattern, Endpoint{action, root <> List.append(&2, P, policies, [policy])}, ids} <> entries
489
490def groups.prepare(~P: Data, groups: List<&2, Group<P>>, +all: List<&2, Group<P>>) -> Result<&2, &2, RegistrationError, List<&2, GroupPlan<P>>>:
491 match groups:
492 case Nil{}:
493 Done{Nil{}}
494 case Group{id, ancestors, policy} <> rest:
495 +ids = List.append(&2, U32, ancestors, [id])
496 do Result<&2, &2, RegistrationError, List<&2, GroupPlan<P>>>:
497 policies : List<&2, P> <- routes.policies(~P, groups.policies(~P, ids, all, Nil{}), ids)
498 plans : List<&2, GroupPlan<P>> <- groups.prepare(~P, rest, all)
499 return GroupPlan{ids, policies} <> plans
500
501def groups.select(~P: Data, same: Bool, policies: List<&2, P>, later: Unit -> List<&2, P>) -> List<&2, P>:
502 match same:
503 case True{}: policies
504 case False{}: later(Unit{})
505
506def groups.prepared(~P: Data, plans: List<&2, GroupPlan<P>>, +ids: List<&2, U32>) -> List<&2, P>:
507 match plans:
508 case Nil{}:
509 Nil{}
510 case GroupPlan{here, policies} <> rest:
511 groups.select(~P, groups.equal(here, ids), policies, u => groups.prepared(~P, rest, ids))
512
513def 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>>:
514 match result:
515 case Fail{error}:
516 Fail{RouteError{error}}
517 case Done{table}:
518 Done{Application{table, context, root, groups}}
519
520def 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>>:
521 match valid:
522 case False{}:
523 Fail{InvalidGroups{Nil{}}}
524 case True{}:
525 do Result<&2, &2, RegistrationError, Application<A, C, P>>:
526 entries : List<&2, Router.Entry<Endpoint<A, P>>> <- routes.prepare(~A, ~P, routes, groups, root)
527 plans : List<&2, GroupPlan<P>> <- groups.prepare(~P, groups, groups)
528 application.table(~A, ~C, ~P, Router.prepare(~Endpoint<A, P>, entries), context, root, plans)
529
530# Construction is pure and fallible; no listener or owner is started here.
531def 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>>:
532 application.valid(~A, ~C, ~P, groups.valid(~P, groups, groups), routes, groups, context, root)
533
534def describe(~A: Data, ~C: Data, ~P: Data, app: Application<A, C, P>) -> List<&2, Router.Description>:
535 Application{table, context, root, groups} = app
536 Router.describe(~Endpoint<A, P>, table)
537
538# A closed template can run repeatedly; an affine callback registry cannot.
539def plain(~handler: Http.Req -> IO(Http.Res), req: Http.Req) -> IO(Result<&2, &1, ResponseError, Http.Res>):
540 do IO<Result<&2, &1, ResponseError, Http.Res>>:
541 response : Http.Res <- handler(req)
542 return validate(response)
543
544type Policy<-H: Data> is Data:
545 Policy{id: U32, before: List<&2, H>, transforms: List<&2, H>}
546
547def policy(~H: Data, id: U32, before: List<&2, H>, transforms: List<&2, H>) -> Policy<H>:
548 Policy{id, before, List.reverse(&2, H, transforms)}
549
550type Metadata is Data:
551 Metadata{method: String, target: String, headers: Map<&2, List<&2, String>>}
552
553type Error<-E: Data> is Data:
554 ApplicationError{error: E}
555 Framework{status: U32, allow: String}
556 ResponseInvalid{}
557
558# Adapt reusable input status failures to the existing one-pass dispatch mapper.
559def input(~I: Type, ~E: Data, outcome: Result<&2, &1, U32, I>) -> Result<&2, &1, Error<E>, I>:
560 match outcome:
561 case Fail{status}: Fail{Framework{status, ""}}
562 case Done{value}: Done{value}
563
564def execute.decoded(~I: Type, ~S: Type, ~K: Data, ~E: Data,
565 ~handler: S -> K -> I -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
566 outcome: Result<&2, &1, Error<E>, I>, state: S, config: K
567) -> IO(S & Result<&2, &1, Error<E>, Http.Res>):
568 match outcome:
569 case Fail{error}: IO.pure(S & Result<&2, &1, Error<E>, Http.Res>, (state, Fail{error}))
570 case Done{value}: handler(state, config, value)
571
572# An executor, not a second dispatcher: call from dispatch's run template, after
573# all applicable before hooks. Only validated typed input reaches business IO.
574def execute(~I: Type, ~S: Type, ~K: Data, ~E: Data, ~H: Data,
575 ~decoder: K -> Match<Policy<H>> -> Http.Req -> Result<&2, &1, Error<E>, I>,
576 ~handler: S -> K -> I -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
577 state: S, +config: K, selected: Match<Policy<H>>, req: Http.Req
578) -> IO(S & Result<&2, &1, Error<E>, Http.Res>):
579 execute.decoded(~I, ~S, ~K, ~E, ~handler, decoder(config, selected, req), state, config)
580
581type Step<-S: Type, -E: Data> is Type:
582 Continue{state: S}
583 Early{state: S, response: Http.Res}
584 Reject{state: S, error: Error<E>}
585
586type Completion<-S: Type, -H: Data> is Type:
587 Completed{state: S, response: Http.Res, entered: List<&2, Policy<H>>, mapped: Bool, stopped: Bool}
588
589# Application completion only: no socket write, duration, or peer-receipt claim.
590def minimal() -> Http.Res:
591 empty(500)
592
593def problem.allow(add: Bool, headers: Map<&2, List<&2, String>>, allow: String) -> Map<&2, List<&2, String>>:
594 match add:
595 case True{}: Http.set(headers, "allow", allow)
596 case False{}: headers
597
598def problem.response(allow: String, response: Http.Res) -> Http.Res:
599 Http.Res{+status, headers, body} = response
600 Http.Res{status, problem.allow(U32.is_eq(status, 405), Http.set(headers, "content-type", "application/problem+json"), allow), body}
601
602def problem(+status: U32, title: String, allow: String) -> Http.Res:
603 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))})]}))
604
605def default.error(~E: Data, error: Error<E>) -> Http.Res:
606 match error:
607 case Framework{status, allow}:
608 match status:
609 case 400:
610 problem(400, "Bad Request", allow)
611 case 404:
612 problem(404, "Not Found", allow)
613 case 405:
614 problem(405, "Method Not Allowed", allow)
615 case 415:
616 problem(415, "Unsupported Media Type", allow)
617 case _:
618 minimal()
619 case _:
620 minimal()
621
622def default.mapper(~S: Type, ~K: Data, ~E: Data, state: S, config: K, error: Error<E>) -> IO(S & Result<&2, &1, Error<E>, Http.Res>):
623 IO.pure(S & Result<&2, &1, Error<E>, Http.Res>, (state, Done{default.error(~E, error)}))
624
625def 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>:
626 match result:
627 case Fail{error}:
628 Completed{state, minimal(), entered, True{}, True{}}
629 case Done{response}:
630 Completed{state, response, entered, True{}, stopped}
631
632def 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>:
633 (state, outcome) = result
634 match outcome:
635 case Fail{error}:
636 Completed{state, minimal(), entered, True{}, True{}}
637 case Done{response}:
638 mapped.checked(~S, ~H, state, entered, stopped, validate(response))
639
640def failed(~S: Type, ~K: Data, ~E: Data, ~H: Data,
641 ~mapper: S -> K -> Error<E> -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
642 mapped: Bool, state: S, config: K, error: Error<E>, entered: List<&2, Policy<H>>, stopped: Bool
643) -> IO(Completion<S, H>):
644 match mapped:
645 case True{}:
646 IO.pure(Completion<S, H>, Completed{state, minimal(), entered, True{}, True{}})
647 case False{}:
648 do IO<Completion<S, H>>:
649 result : S & Result<&2, &1, Error<E>, Http.Res> <- mapper(state, config, error)
650 return mapped.result(~S, ~E, ~H, entered, stopped, result)
651
652def result(~S: Type, ~K: Data, ~E: Data, ~H: Data,
653 ~mapper: S -> K -> Error<E> -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
654 config: K, entered: List<&2, Policy<H>>, outcome: S & Result<&2, &1, Error<E>, Http.Res>
655) -> IO(Completion<S, H>):
656 (state, response) = outcome
657 match response:
658 case Fail{error}:
659 failed(~S, ~K, ~E, ~H, ~mapper, False{}, state, config, error, entered, False{})
660 case Done{res}:
661 IO.pure(Completion<S, H>, Completed{state, res, entered, False{}, False{}})
662
663def before.next(~S: Type, ~E: Data, step: Step<S, E>, next: S -> IO(Step<S, E>)) -> IO(Step<S, E>):
664 match step:
665 case Continue{state}:
666 next(state)
667 case Early{state, response}:
668 IO.pure(Step<S, E>, Early{state, response})
669 case Reject{state, error}:
670 IO.pure(Step<S, E>, Reject{state, error})
671
672def before(~S: Type, ~K: Data, ~E: Data, ~H: Data,
673 ~hook: H -> S -> K -> Metadata -> IO(Step<S, E>),
674 hooks: List<&2, H>, state: S, +config: K, +meta: Metadata
675) -> IO(Step<S, E>):
676 match hooks:
677 case Nil{}:
678 IO.pure(Step<S, E>, Continue{state})
679 case h <> rest:
680 do IO<Step<S, E>>:
681 step : Step<S, E> <- hook(h, state, config, meta)
682 before.next(~S, ~E, step, s => before(~S, ~K, ~E, ~H, ~hook, rest, s, config, meta))
683
684def transformed(~S: Type, ~K: Data, ~E: Data, ~H: Data,
685 ~mapper: S -> K -> Error<E> -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
686 config: K, entered: List<&2, Policy<H>>, mapped: Bool, outcome: S & Result<&2, &1, Error<E>, Http.Res>
687) -> IO(Completion<S, H>):
688 (state, response) = outcome
689 match response:
690 case Fail{error}:
691 failed(~S, ~K, ~E, ~H, ~mapper, mapped, state, config, error, entered, True{})
692 case Done{res}:
693 IO.pure(Completion<S, H>, Completed{state, res, entered, mapped, False{}})
694
695def transforms(~S: Type, ~K: Data, ~E: Data, ~H: Data,
696 ~hook: H -> S -> K -> Http.Res -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
697 ~mapper: S -> K -> Error<E> -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
698 hooks: List<&2, H>, +config: K, completion: Completion<S, H>
699) -> IO(Completion<S, H>):
700 match hooks:
701 case Nil{}:
702 IO.pure(Completion<S, H>, completion)
703 case h <> rest:
704 match completion:
705 case Completed{state, response, entered, mapped, True{}}:
706 IO.pure(Completion<S, H>, Completed{state, response, entered, mapped, True{}})
707 case Completed{state, response, +entered, +mapped, False{}}:
708 do IO<Completion<S, H>>:
709 changed : S & Result<&2, &1, Error<E>, Http.Res> <- hook(h, state, config, response)
710 next : Completion<S, H> <- transformed(~S, ~K, ~E, ~H, ~mapper, config, entered, mapped, changed)
711 transforms(~S, ~K, ~E, ~H, ~hook, ~mapper, rest, config, next)
712
713def entered.step(~S: Type, ~K: Data, ~E: Data, ~H: Data,
714 ~mapper: S -> K -> Error<E> -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
715 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>)
716) -> IO(Completion<S, H>):
717 match step:
718 case Continue{state}:
719 next(state, entered, body)
720 case Early{state, response}:
721 IO.pure(Completion<S, H>, Completed{state, response, entered, False{}, False{}})
722 case Reject{state, error}:
723 failed(~S, ~K, ~E, ~H, ~mapper, False{}, state, config, error, entered, False{})
724
725def scopes(~S: Type, ~K: Data, ~E: Data, ~H: Data,
726 ~before_hook: H -> S -> K -> Metadata -> IO(Step<S, E>),
727 ~after_hook: H -> S -> K -> Http.Res -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
728 ~mapper: S -> K -> Error<E> -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
729 policies: List<&2, Policy<H>>, state: S, +config: K, +meta: Metadata, entered: List<&2, Policy<H>>, body: Http.Body,
730 next: S -> List<&2, Policy<H>> -> Http.Body -> IO(Completion<S, H>)
731) -> IO(Completion<S, H>):
732 match policies:
733 case Nil{}:
734 next(state, entered, body)
735 case Policy{+id, +hooks, +unwind} <> rest:
736 scope = {Policy{id, hooks, unwind} : Policy<H>}
737 do IO<Completion<S, H>>:
738 step : Step<S, E> <- before(~S, ~K, ~E, ~H, ~before_hook, hooks, state, config, meta)
739 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))
740 transforms(~S, ~K, ~E, ~H, ~after_hook, ~mapper, unwind, config, inner)
741
742def finish.checked(~S: Type, ~K: Data, ~E: Data, ~H: Data,
743 ~mapper: S -> K -> Error<E> -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
744 state: S, config: K, entered: List<&2, Policy<H>>, mapped: Bool, stopped: Bool, checked: Result<&2, &1, ResponseError, Http.Res>
745) -> IO(Completion<S, H>):
746 match checked:
747 case Done{response}:
748 IO.pure(Completion<S, H>, Completed{state, response, entered, mapped, stopped})
749 case Fail{error}:
750 failed(~S, ~K, ~E, ~H, ~mapper, mapped, state, config, ResponseInvalid{}, entered, True{})
751
752def finish(~S: Type, ~K: Data, ~E: Data, ~H: Data,
753 ~mapper: S -> K -> Error<E> -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
754 config: K, completion: Completion<S, H>
755) -> IO(Completion<S, H>):
756 Completed{state, response, entered, mapped, stopped} = completion
757 finish.checked(~S, ~K, ~E, ~H, ~mapper, state, config, entered, mapped, stopped, validate(response))
758
759def policies.tail(~H: Data, policies: List<&2, Policy<H>>) -> List<&2, Policy<H>>:
760 match policies:
761 case Nil{}:
762 Nil{}
763 case root <> rest:
764 rest
765
766
767def endpoint(~A: Data, ~S: Type, ~K: Data, ~E: Data, ~H: Data,
768 ~run: A -> S -> K -> Match<Policy<H>> -> Http.Req -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
769 ~mapper: S -> K -> Error<E> -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
770 action: A, state: S, +config: K, selected: Match<Policy<H>>, meta: Metadata, entered: List<&2, Policy<H>>, body: Http.Body
771) -> IO(Completion<S, H>):
772 Metadata{method, target, headers} = meta
773 do IO<Completion<S, H>>:
774 outcome : S & Result<&2, &1, Error<E>, Http.Res> <- run(action, state, config, selected, Http.Req{method, target, headers, body})
775 result(~S, ~K, ~E, ~H, ~mapper, config, entered, outcome)
776
777def framework(~S: Type, ~K: Data, ~E: Data, ~H: Data,
778 ~mapper: S -> K -> Error<E> -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
779 +status: U32, allow: String, state: S, config: K, entered: List<&2, Policy<H>>, body: Http.Body
780) -> IO(Completion<S, H>):
781 match status:
782 case 204:
783 IO.pure(Completion<S, H>, Completed{state, Http.Res{204, Http.set(Http.empty(), "allow", allow), Http.from_string("")}, entered, False{}, False{}})
784 case _:
785 failed(~S, ~K, ~E, ~H, ~mapper, False{}, state, config, Framework{status, allow}, entered, False{})
786
787def choice(~A: Data, ~S: Type, ~K: Data, ~E: Data, ~H: Data,
788 ~before_hook: H -> S -> K -> Metadata -> IO(Step<S, E>),
789 ~after_hook: H -> S -> K -> Http.Res -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
790 ~run: A -> S -> K -> Match<Policy<H>> -> Http.Req -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
791 ~mapper: S -> K -> Error<E> -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
792 selected: Router.Choice<Endpoint<A, Policy<H>>>, target: Target.Target,
793 groups: List<&2, GroupPlan<Policy<H>>>, state: S, +config: K, +meta: Metadata, entered: List<&2, Policy<H>>, body: Http.Body
794) -> IO(Completion<S, H>):
795 match selected:
796 case Router.NotFound{}:
797 framework(~S, ~K, ~E, ~H, ~mapper, 404, "", state, config, entered, body)
798 case Router.MethodMissing{ids, allow}:
799 policies = groups.prepared(~Policy<H>, groups, ids)
800 scopes(~S, ~K, ~E, ~H, ~before_hook, ~after_hook, ~mapper, policies, state, config, meta, entered, body,
801 s => entered => b => framework(~S, ~K, ~E, ~H, ~mapper, 405, allow, s, config, entered, b))
802 case Router.Options{ids, allow}:
803 policies = groups.prepared(~Policy<H>, groups, ids)
804 scopes(~S, ~K, ~E, ~H, ~before_hook, ~after_hook, ~mapper, policies, state, config, meta, entered, body,
805 s => entered => b => framework(~S, ~K, ~E, ~H, ~mapper, 204, allow, s, config, entered, b))
806 case Router.Found{Endpoint{action, +policies}, params, ids, method, pattern}:
807 selected = {Match{target, params, ids, method, pattern, policies} : Match<Policy<H>>}
808 scopes(~S, ~K, ~E, ~H, ~before_hook, ~after_hook, ~mapper, policies.tail(~H, policies), state, config, meta, entered, body,
809 s => entered => b => endpoint(~A, ~S, ~K, ~E, ~H, ~run, ~mapper, action, s, config, selected, meta, entered, b))
810
811def metadata.authority(authority: Maybe<&2, String>, meta: Metadata) -> Metadata:
812 match authority:
813 case None{}:
814 meta
815 case Some{host}:
816 Metadata{method, target, headers} = meta
817 Metadata{method, target, Http.set(headers, "host", host)}
818
819def resolved(~A: Data, ~S: Type, ~K: Data, ~E: Data, ~H: Data,
820 ~before_hook: H -> S -> K -> Metadata -> IO(Step<S, E>),
821 ~after_hook: H -> S -> K -> Http.Res -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
822 ~run: A -> S -> K -> Match<Policy<H>> -> Http.Req -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
823 ~mapper: S -> K -> Error<E> -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
824 outcome: Result<&2, &2, Router.Error, Router.Resolved<Endpoint<A, Policy<H>>>>,
825 groups: List<&2, GroupPlan<Policy<H>>>, state: S, config: K, meta: Metadata, entered: List<&2, Policy<H>>, body: Http.Body
826) -> IO(Completion<S, H>):
827 match outcome:
828 case Fail{error}:
829 framework(~S, ~K, ~E, ~H, ~mapper, 400, "", state, config, entered, body)
830 case Done{Router.Resolved{+target, selected}}:
831 Target.Target{segments, query, authority, star} = target
832 choice(~A, ~S, ~K, ~E, ~H, ~before_hook, ~after_hook, ~run, ~mapper, selected, target, groups, state, config, metadata.authority(authority, meta), entered, body)
833
834def dispatch.application(~A: Data, ~S: Type, ~K: Data, ~E: Data, ~H: Data,
835 ~before_hook: H -> S -> K -> Metadata -> IO(Step<S, E>),
836 ~after_hook: H -> S -> K -> Http.Res -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
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 app: Application<A, K, Policy<H>>, state: S, req: Http.Req
840) -> IO(Completion<S, H>):
841 Application{table, +config, root, groups} = app
842 Http.Req{+method, +path, +headers, body} = req
843 +meta = {Metadata{method, path, headers} : Metadata}
844 do IO<Completion<S, H>>:
845 completion : Completion<S, H> <- scopes(~S, ~K, ~E, ~H, ~before_hook, ~after_hook, ~mapper, [root], state, config, meta, Nil{}, body,
846 s => entered => b => resolved(~A, ~S, ~K, ~E, ~H, ~before_hook, ~after_hook, ~run, ~mapper,
847 Router.resolve(~Endpoint<A, Policy<H>>, table, method, path), groups, s, config, meta, entered, b))
848 finish(~S, ~K, ~E, ~H, ~mapper, config, completion)
849
850def access.disabled(~K: Data, config: K) -> Notices.Access:
851 Notices.Disabled{}
852
853def notice.ignore(~N: Data, ~H: Data, ~E: Data, observer: N, policy: Policy<H>, notice: Notices.Notice) -> IO(Result<&2, &2, E, Unit>):
854 IO.pure(Result<&2, &2, E, Unit>, Done{Unit{}})
855
856def notice.error.ignore(~N: Data, ~E: Data, observer: N, error: E) -> IO(Unit):
857 IO.pure(Unit, Unit{})
858
859def notice.result(~N: Data, ~E: Data, ~report: N -> E -> IO(Unit), observer: N, result: Result<&2, &2, E, Unit>) -> IO(Unit):
860 match result:
861 case Done{unit}: IO.pure(Unit, Unit{})
862 case Fail{error}: report(observer, error)
863
864def notices(~N: Data, ~H: Data, ~E: Data,
865 ~notify: N -> Policy<H> -> Notices.Notice -> IO(Result<&2, &2, E, Unit>),
866 ~report: N -> E -> IO(Unit),
867 entered: List<&2, Policy<H>>, +observer: N, +notice: Notices.Notice
868) -> IO(Unit):
869 match entered:
870 case Nil{}: IO.pure(Unit, Unit{})
871 case policy <> rest:
872 do IO<Unit>:
873 result : Result<&2, &2, E, Unit> <- notify(observer, policy, notice)
874 notice.result(~N, ~E, ~report, observer, result)
875 notices(~N, ~H, ~E, ~notify, ~report, rest, observer, notice)
876
877def dispatch.completed(~S: Type, ~N: Data, ~H: Data, ~E: Data,
878 ~notify: N -> Policy<H> -> Notices.Notice -> IO(Result<&2, &2, E, Unit>),
879 ~report: N -> E -> IO(Unit),
880 observer: N, access: Notices.Access, started: Time.Duration, completion: Completion<S, H>
881) -> IO(Completion<S, H>):
882 Completed{state, Http.Res{+status, headers, body}, +entered, +mapped, +stopped} = completion
883 do IO<Completion<S, H>>:
884 ended : Time.Duration <- Time.mono()
885 +notice : Notices.Notice = Notices.Notice{status, Time.Duration.sub(ended, started), mapped, stopped, Notices.ApplicationOnly{}}
886 notices(~N, ~H, ~E, ~notify, ~report, entered, observer, notice)
887 Notices.access(access, notice)
888 return Completed{state, Http.Res{status, headers, body}, entered, mapped, stopped}
889
890# The same application pipeline is used live; only this boundary emits direct notices.
891def dispatch(~A: Data, ~S: Type, ~K: Data, ~E: Data, ~H: Data, ~N: Data,
892 ~before_hook: H -> S -> K -> Metadata -> IO(Step<S, E>),
893 ~after_hook: H -> S -> K -> Http.Res -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
894 ~run: A -> S -> K -> Match<Policy<H>> -> Http.Req -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
895 ~mapper: S -> K -> Error<E> -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
896 ~notify: N -> Policy<H> -> Notices.Notice -> IO(Result<&2, &2, E, Unit>),
897 ~report: N -> E -> IO(Unit),
898 observer: N, access: Notices.Access, app: Application<A, K, Policy<H>>, state: S, req: Http.Req
899) -> IO(Completion<S, H>):
900 do IO<Completion<S, H>>:
901 started : Time.Duration <- Time.mono()
902 completion : Completion<S, H> <- dispatch.application(~A, ~S, ~K, ~E, ~H, ~before_hook, ~after_hook, ~run, ~mapper, app, state, req)
903 dispatch.completed(~S, ~N, ~H, ~E, ~notify, ~report, observer, access, started, completion)
904
905# The wrapper owns both pipes until its admitted operation really returns.
906# Only disposable HTTP packed buffers cross them, never external handles.
907type BufferedRequest is Data:
908 BufferedRequest{metadata: Metadata, body: Chan(Http.Body), response: Chan(Http.Res)}
909
910type ApplicationReport<-H: Data> is Data:
911 Dispatched{entered: List<&2, Policy<H>>, mapped: Bool, stopped: Bool}
912 CapacityRejected{}
913
914type ServingContext<-A: Data, -S: Type, -K: Data, -H: Data> is Data:
915 ServingContext{application: Application<A, K, Policy<H>>,
916 owner: Context<S, Application<A, K, Policy<H>>, BufferedRequest, Unit, ApplicationReport<H>>}
917
918type Server<-A: Data, -S: Type, -K: Data, -H: Data> is Type:
919 Server{transport: Http.Server<ServingContext<A, S, K, H>>,
920 owner: Owner<S, Application<A, K, Policy<H>>, BufferedRequest, Unit, ApplicationReport<H>>}
921
922type StartupError is Data:
923 RegistrationFailed{error: RegistrationError}
924 TransportFailed{error: Http.StartupError}
925 EmptyBundles{}
926
927type ServerExit<-A: Data, -S: Type, -K: Data, -H: Data> is Type:
928 ServerExit{transport: Http.ServerExit, application: OwnerClose<S, Application<A, K, Policy<H>>, BufferedRequest, Unit, ApplicationReport<H>>}
929
930def server.config(port: U32) -> Http.ServerConfig:
931 Http.ServerConfig{"127.0.0.1", port, 1048576, 65536, 128, 128, 128, 5000, 30000, 30000, 30000}
932
933def server.bundles.cons(~S: Type, resource: S, counted: List<S> & Nat) -> List<S> & Nat:
934 (returned, count) = counted
935 (resource <> returned, 1n+count)
936
937def server.bundles(~S: Type, resources: List<S>) -> List<S> & Nat:
938 match resources:
939 case Nil{}: (Nil{}, 0n)
940 case resource <> rest:
941 server.bundles.cons(~S, resource, server.bundles(~S, rest))
942
943def server.work.completed(~S: Type, ~H: Data, response_channel: Chan(Http.Res),
944 completion: Completion<S, H>
945) -> IO(S & Result<&2, &2, Unit, ApplicationReport<H>>):
946 Completed{state, response, entered, mapped, stopped} = completion
947 do IO<S & Result<&2, &2, Unit, ApplicationReport<H>>>:
948 sent : Result<&1, &1, Http.Res, Unit> <- Chan.send(Http.Res, response_channel, response)
949 return (state, Done{Dispatched{entered, mapped, stopped}})
950
951def server.work(~A: Data, ~S: Type, ~K: Data, ~E: Data, ~H: Data,
952 ~before_hook: H -> S -> K -> Metadata -> IO(Step<S, E>),
953 ~after_hook: H -> S -> K -> Http.Res -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
954 ~run: A -> S -> K -> Match<Policy<H>> -> Http.Req -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
955 ~mapper: S -> K -> Error<E> -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
956 state: S, app: Application<A, K, Policy<H>>, input: BufferedRequest
957) -> IO(S & Result<&2, &2, Unit, ApplicationReport<H>>):
958 BufferedRequest{Metadata{method, target, headers}, body_channel, response_channel} = input
959 do IO<S & Result<&2, &2, Unit, ApplicationReport<H>>>:
960 body : Http.Body <- receive(Http.Body, body_channel)
961 completion : Completion<S, H> <- dispatch.application(~A, ~S, ~K, ~E, ~H, ~before_hook, ~after_hook, ~run, ~mapper,
962 app, state, Http.Req{method, target, headers, body})
963 server.work.completed(~S, ~H, response_channel, completion)
964
965type NoticePayload<-K: Data, -H: Data> is Data:
966 NoticePayload{config: K, started: Time.Duration, application: ApplicationReport<H>}
967
968def server.notified(~K: Data, ~H: Data, ~E: Data,
969 ~notify: K -> Policy<H> -> Notices.Notice -> IO(Result<&2, &2, E, Unit>),
970 ~report: K -> E -> IO(Unit), ~access: K -> Notices.Access,
971 ~done: TransportCompletion.Completion<ApplicationReport<H>> -> IO(Unit),
972 +config: K, +notice: Notices.Notice, application: ApplicationReport<H>,
973 status: U32, outcome: TransportCompletion.Outcome
974) -> IO(Unit):
975 match application:
976 case Dispatched{+entered, +mapped, +stopped}:
977 do IO<Unit>:
978 notices(~K, ~H, ~E, ~notify, ~report, entered, config, notice)
979 Notices.access(access(config), notice)
980 done(TransportCompletion.Completion{Dispatched{entered, mapped, stopped}, status, outcome})
981 case CapacityRejected{}:
982 do IO<Unit>:
983 Notices.access(access(config), notice)
984 done(TransportCompletion.Completion{CapacityRejected{}, status, outcome})
985
986def server.completed.report(~K: Data, ~H: Data, ~E: Data,
987 ~notify: K -> Policy<H> -> Notices.Notice -> IO(Result<&2, &2, E, Unit>),
988 ~report: K -> E -> IO(Unit), ~access: K -> Notices.Access,
989 ~done: TransportCompletion.Completion<ApplicationReport<H>> -> IO(Unit),
990 config: K, duration: Time.Duration, application: ApplicationReport<H>, +status: U32, +outcome: TransportCompletion.Outcome
991) -> IO(Unit):
992 match application:
993 case Dispatched{+entered, +mapped, +stopped}:
994 server.notified(~K, ~H, ~E, ~notify, ~report, ~access, ~done, config,
995 Notices.Notice{status, duration, mapped, stopped, Notices.Transport{outcome}}, Dispatched{entered, mapped, stopped}, status, outcome)
996 case CapacityRejected{}:
997 server.notified(~K, ~H, ~E, ~notify, ~report, ~access, ~done, config,
998 Notices.Notice{status, duration, False{}, False{}, Notices.Transport{outcome}}, CapacityRejected{}, status, outcome)
999
1000def server.completed(~K: Data, ~H: Data, ~E: Data,
1001 ~notify: K -> Policy<H> -> Notices.Notice -> IO(Result<&2, &2, E, Unit>),
1002 ~report: K -> E -> IO(Unit), ~access: K -> Notices.Access,
1003 ~done: TransportCompletion.Completion<ApplicationReport<H>> -> IO(Unit),
1004 completion: TransportCompletion.Completion<NoticePayload<K, H>>
1005) -> IO(Unit):
1006 TransportCompletion.Completion{NoticePayload{config, started, +application}, +status, +outcome} = completion
1007 do IO<Unit>:
1008 ended : Time.Duration <- Time.mono()
1009 server.completed.report(~K, ~H, ~E, ~notify, ~report, ~access, ~done, config, Time.Duration.sub(ended, started), application, status, outcome)
1010
1011def server.response(~K: Data, ~H: Data,
1012 ~done: TransportCompletion.Completion<NoticePayload<K, H>> -> IO(Unit),
1013 config: K, started: Time.Duration, outcome: Outcome<Unit, ApplicationReport<H>>, +body: Chan(Http.Body), +response: Chan(Http.Res)
1014) -> IO(Http.Reply):
1015 match outcome:
1016 case Success{report}:
1017 do IO<Http.Reply>:
1018 result : Http.Res <- receive(Http.Res, response)
1019 Chan.close(Http.Body, body)
1020 Chan.close(Http.Res, response)
1021 return Http.reply.complete(~NoticePayload<K, H>, ~done, NoticePayload{config, started, report}, result)
1022 case _:
1023 do IO<Http.Reply>:
1024 # Closing alone retains buffered values in Base. Consume the rejected
1025 # body before closing; the single room1 send has already completed.
1026 discarded : Http.Body <- receive(Http.Body, body)
1027 Chan.close(Http.Body, body)
1028 Chan.close(Http.Res, response)
1029 return Http.reply.complete(~NoticePayload<K, H>, ~done, NoticePayload{config, started, CapacityRejected{}},
1030 Http.Res{503, Http.set(Http.empty(), "connection", "close"), Http.from_string("")})
1031
1032def server.handle(~A: Data, ~S: Type, ~K: Data, ~H: Data,
1033 ~done: TransportCompletion.Completion<NoticePayload<K, H>> -> IO(Unit),
1034 context: ServingContext<A, S, K, H>, req: Http.Req
1035) -> IO(Http.Reply):
1036 ServingContext{+app, owner} = context
1037 Application{table, config, root, groups} = app
1038 Http.Req{method, target, headers, body} = req
1039 do IO<Http.Reply>:
1040 started : Time.Duration <- Time.mono()
1041 +body_channel : Chan(Http.Body) <- Chan.new(Http.Body, 1)
1042 +response_channel : Chan(Http.Res) <- Chan.new(Http.Res, 1)
1043 sent : Result<&1, &1, Http.Body, Unit> <- Chan.send(Http.Body, body_channel, body)
1044 outcome : Outcome<Unit, ApplicationReport<H>> <- call(S, Application<A, K, Policy<H>>, BufferedRequest, Unit, ApplicationReport<H>,
1045 owner, app, BufferedRequest{Metadata{method, target, headers}, body_channel, response_channel})
1046 server.response(~K, ~H, ~done, config, started, outcome, body_channel, response_channel)
1047
1048
1049def server.started(~A: Data, ~S: Type, ~K: Data, ~H: Data,
1050 ~work: S -> Application<A, K, Policy<H>> -> BufferedRequest -> IO(S & Result<&2, &2, Unit, ApplicationReport<H>>),
1051 ~destroy: S -> IO(Unit),
1052 +context: Context<S, Application<A, K, Policy<H>>, BufferedRequest, Unit, ApplicationReport<H>>,
1053 room: U32, capacity: Nat,
1054 started: List<S> & Result<&2, &1, Http.StartupError, Http.Server<ServingContext<A, S, K, H>>>
1055) -> IO(Result<&2, &1, StartupError, Server<A, S, K, H>>):
1056 Context{+messages} = context
1057 (resources, result) = started
1058 match result:
1059 case Fail{error}:
1060 do IO<Result<&2, &1, StartupError, Server<A, S, K, H>>>:
1061 dispose(~S, ~destroy, resources)
1062 Chan.close(Message<S, Application<A, K, Policy<H>>, BufferedRequest, Unit, ApplicationReport<H>>, messages)
1063 return Fail{TransportFailed{error}}
1064 case Done{transport}:
1065 do IO<Result<&2, &1, StartupError, Server<A, S, K, H>>>:
1066 finished : Chan(Unit) <- IO.fork(Unit, owner(~S, ~Application<A, K, Policy<H>>, ~BufferedRequest, ~Unit, ~ApplicationReport<H>,
1067 ~work, ~destroy, messages, room, Waiting{resources, Counts{capacity, 0n, 0n, 0n}}))
1068 return Done{Server{transport, Owner{Context{messages}, finished}}}
1069
1070def server.prepared(~A: Data, ~S: Type, ~K: Data, ~H: Data,
1071 ~work: S -> Application<A, K, Policy<H>> -> BufferedRequest -> IO(S & Result<&2, &2, Unit, ApplicationReport<H>>),
1072 ~destroy: S -> IO(Unit), app: Application<A, K, Policy<H>>, +config: Http.ServerConfig, resources: List<S> & Nat
1073) -> IO(Result<&2, &1, StartupError, Server<A, S, K, H>>):
1074 Http.ServerConfig{host, port, body, headers, connections, requests, +buffered, hm, bm, im, wm} = config
1075 (bundles, capacity) = resources
1076 match capacity:
1077 case 0n:
1078 do IO<Result<&2, &1, StartupError, Server<A, S, K, H>>>:
1079 dispose(~S, ~destroy, bundles)
1080 return Fail{EmptyBundles{}}
1081 case 1n+ +rest:
1082 do IO<Result<&2, &1, StartupError, Server<A, S, K, H>>>:
1083 messages : Chan(Message<S, Application<A, K, Policy<H>>, BufferedRequest, Unit, ApplicationReport<H>>) <-
1084 Chan.new(Message<S, Application<A, K, Policy<H>>, BufferedRequest, Unit, ApplicationReport<H>>, buffered)
1085 +context : Context<S, Application<A, K, Policy<H>>, BufferedRequest, Unit, ApplicationReport<H>> = Context{messages}
1086 started : List<S> & Result<&2, &1, Http.StartupError, Http.Server<ServingContext<A, S, K, H>>> <-
1087 Http.server.start(~ServingContext<A, S, K, H>, ~List<S>, ServingContext{app, context}, bundles, config)
1088 server.started(~A, ~S, ~K, ~H, ~work, ~destroy, context, buffered, 1n+rest, started)
1089
1090def server.valid(~A: Data, ~S: Type, ~K: Data, ~H: Data,
1091 ~work: S -> Application<A, K, Policy<H>> -> BufferedRequest -> IO(S & Result<&2, &2, Unit, ApplicationReport<H>>),
1092 ~destroy: S -> IO(Unit), valid: Bool, app: Application<A, K, Policy<H>>, config: Http.ServerConfig, resources: List<S>
1093) -> IO(Result<&2, &1, StartupError, Server<A, S, K, H>>):
1094 match valid:
1095 case False{}:
1096 do IO<Result<&2, &1, StartupError, Server<A, S, K, H>>>:
1097 dispose(~S, ~destroy, resources)
1098 return Fail{TransportFailed{Http.InvalidConfig{}}}
1099 case True{}:
1100 server.prepared(~A, ~S, ~K, ~H, ~work, ~destroy, app, config, server.bundles(~S, resources))
1101
1102def server.registered(~A: Data, ~S: Type, ~K: Data, ~H: Data,
1103 ~work: S -> Application<A, K, Policy<H>> -> BufferedRequest -> IO(S & Result<&2, &2, Unit, ApplicationReport<H>>),
1104 ~destroy: S -> IO(Unit), registration: Result<&2, &2, RegistrationError, Application<A, K, Policy<H>>>,
1105 +config: Http.ServerConfig, resources: List<S>
1106) -> IO(Result<&2, &1, StartupError, Server<A, S, K, H>>):
1107 match registration:
1108 case Fail{error}:
1109 do IO<Result<&2, &1, StartupError, Server<A, S, K, H>>>:
1110 dispose(~S, ~destroy, resources)
1111 return Fail{RegistrationFailed{error}}
1112 case Done{app}:
1113 server.valid(~A, ~S, ~K, ~H, ~work, ~destroy, Http.server.config.valid(config), app, config, resources)
1114
1115def server.start(~A: Data, ~S: Type, ~K: Data, ~E: Data, ~H: Data,
1116 ~before_hook: H -> S -> K -> Metadata -> IO(Step<S, E>),
1117 ~after_hook: H -> S -> K -> Http.Res -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
1118 ~run: A -> S -> K -> Match<Policy<H>> -> Http.Req -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
1119 ~mapper: S -> K -> Error<E> -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
1120 ~destroy: S -> IO(Unit),
1121 registration: Result<&2, &2, RegistrationError, Application<A, K, Policy<H>>>,
1122 config: Http.ServerConfig, resources: List<S>
1123) -> IO(Result<&2, &1, StartupError, Server<A, S, K, H>>):
1124 server.registered(~A, ~S, ~K, ~H,
1125 ~(state => app => input => server.work(~A, ~S, ~K, ~E, ~H, ~before_hook, ~after_hook, ~run, ~mapper, state, app, input)),
1126 ~destroy, registration, config, resources)
1127
1128def server.control.result(~A: Data, ~S: Type, ~K: Data, ~H: Data,
1129 controlled: Http.Server<ServingContext<A, S, K, H>> & Http.ServerControl,
1130 owner: Owner<S, Application<A, K, Policy<H>>, BufferedRequest, Unit, ApplicationReport<H>>
1131) -> Server<A, S, K, H> & Http.ServerControl:
1132 (returned, control) = controlled
1133 (Server{returned, owner}, control)
1134
1135def server.control(~A: Data, ~S: Type, ~K: Data, ~H: Data, server: Server<A, S, K, H>) -> Server<A, S, K, H> & Http.ServerControl:
1136 Server{transport, owner} = server
1137 server.control.result(~A, ~S, ~K, ~H, Http.server.control(~ServingContext<A, S, K, H>, transport), owner)
1138
1139def server.observer.result(~A: Data, ~S: Type, ~K: Data, ~H: Data,
1140 observed: Http.Server<ServingContext<A, S, K, H>> & Http.ServerStats,
1141 owner: Owner<S, Application<A, K, Policy<H>>, BufferedRequest, Unit, ApplicationReport<H>>
1142) -> Server<A, S, K, H> & Http.ServerStats:
1143 (returned, stats) = observed
1144 (Server{returned, owner}, stats)
1145
1146def server.observer(~A: Data, ~S: Type, ~K: Data, ~H: Data, server: Server<A, S, K, H>) -> Server<A, S, K, H> & Http.ServerStats:
1147 Server{transport, owner} = server
1148 server.observer.result(~A, ~S, ~K, ~H, Http.server.observer(~ServingContext<A, S, K, H>, transport), owner)
1149
1150def server.dependencies(~A: Data, ~S: Type, ~K: Data, ~H: Data, server: Server<A, S, K, H>
1151) -> Server<A, S, K, H> & Context<S, Application<A, K, Policy<H>>, BufferedRequest, Unit, ApplicationReport<H>>:
1152 Server{transport, Owner{+context, finished}} = server
1153 (Server{transport, Owner{context, finished}}, context)
1154
1155def server.run(~A: Data, ~S: Type, ~K: Data, ~H: Data, ~E: Data,
1156 ~done: TransportCompletion.Completion<ApplicationReport<H>> -> IO(Unit),
1157 ~observe: U32 -> TransportCompletion.Outcome -> IO(Unit),
1158 ~notify: K -> Policy<H> -> Notices.Notice -> IO(Result<&2, &2, E, Unit>),
1159 ~report: K -> E -> IO(Unit), ~access: K -> Notices.Access,
1160 server: Server<A, S, K, H>
1161) -> IO(ServerExit<A, S, K, H>):
1162 Server{transport, owner} = server
1163 do IO<ServerExit<A, S, K, H>>:
1164 exited : Http.ServerExit <- Http.server.run(~ServingContext<A, S, K, H>,
1165 ~(context => req => server.handle(~A, ~S, ~K, ~H,
1166 ~(completion => server.completed(~K, ~H, ~E, ~notify, ~report, ~access, ~done, completion)), context, req)),
1167 ~(context => status => outcome => observe(status, outcome)), transport)
1168 closed : OwnerClose<S, Application<A, K, Policy<H>>, BufferedRequest, Unit, ApplicationReport<H>> <- close(S, Application<A, K, Policy<H>>, BufferedRequest, Unit, ApplicationReport<H>, owner)
1169 return ServerExit{exited, closed}
1170
1171# Without starting the run loop, the caller still explicitly drains transport
1172# and joins application cleanup. A stop request alone is never completion.
1173def server.close(~A: Data, ~S: Type, ~K: Data, ~H: Data, server: Server<A, S, K, H>) -> IO(ServerExit<A, S, K, H>):
1174 Server{transport, owner} = server
1175 do IO<ServerExit<A, S, K, H>>:
1176 counts : Http.ServerCounts <- Http.server.close(~ServingContext<A, S, K, H>, transport)
1177 closed : OwnerClose<S, Application<A, K, Policy<H>>, BufferedRequest, Unit, ApplicationReport<H>> <- close(S, Application<A, K, Policy<H>>, BufferedRequest, Unit, ApplicationReport<H>, owner)
1178 return ServerExit{Http.ServerStopped{counts}, closed}
1179
1180def serve.started(~A: Data, ~S: Type, ~K: Data, ~H: Data, ~E: Data,
1181 ~done: TransportCompletion.Completion<ApplicationReport<H>> -> IO(Unit),
1182 ~observe: U32 -> TransportCompletion.Outcome -> IO(Unit),
1183 ~notify: K -> Policy<H> -> Notices.Notice -> IO(Result<&2, &2, E, Unit>),
1184 ~report: K -> E -> IO(Unit), ~access: K -> Notices.Access,
1185 started: Result<&2, &1, StartupError, Server<A, S, K, H>>
1186) -> IO(Result<&2, &1, StartupError, ServerExit<A, S, K, H>>):
1187 match started:
1188 case Fail{error}: IO.pure(Result<&2, &1, StartupError, ServerExit<A, S, K, H>>, Fail{error})
1189 case Done{server}:
1190 do IO<Result<&2, &1, StartupError, ServerExit<A, S, K, H>>>:
1191 exited : ServerExit<A, S, K, H> <- server.run(~A, ~S, ~K, ~H, ~E, ~done, ~observe, ~notify, ~report, ~access, server)
1192 return Done{exited}
1193
1194# Owners that need readiness/control use server.start then server.run instead.
1195def serve(~A: Data, ~S: Type, ~K: Data, ~E: Data, ~H: Data,
1196 ~before_hook: H -> S -> K -> Metadata -> IO(Step<S, E>),
1197 ~after_hook: H -> S -> K -> Http.Res -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
1198 ~run: A -> S -> K -> Match<Policy<H>> -> Http.Req -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
1199 ~mapper: S -> K -> Error<E> -> IO(S & Result<&2, &1, Error<E>, Http.Res>),
1200 ~destroy: S -> IO(Unit),
1201 ~done: TransportCompletion.Completion<ApplicationReport<H>> -> IO(Unit),
1202 ~observe: U32 -> TransportCompletion.Outcome -> IO(Unit),
1203 ~notify: K -> Policy<H> -> Notices.Notice -> IO(Result<&2, &2, E, Unit>),
1204 ~report: K -> E -> IO(Unit), ~access: K -> Notices.Access,
1205 registration: Result<&2, &2, RegistrationError, Application<A, K, Policy<H>>>,
1206 config: Http.ServerConfig, resources: List<S>
1207) -> IO(Result<&2, &1, StartupError, ServerExit<A, S, K, H>>):
1208 do IO<Result<&2, &1, StartupError, ServerExit<A, S, K, H>>>:
1209 started : Result<&2, &1, StartupError, Server<A, S, K, H>> <-
1210 server.start(~A, ~S, ~K, ~E, ~H, ~before_hook, ~after_hook, ~run, ~mapper, ~destroy, registration, config, resources)
1211 serve.started(~A, ~S, ~K, ~H, ~E, ~done, ~observe, ~notify, ~report, ~access, started)