1 # Fixed prepared HTTP applications and bounded affine dependency bundles. 2 import Base 3 import bend-kit-http@0.30.0.0/http.bend as Http 4 import bend-kit-router@0.2.0.0/router.bend as Router 5 import bend-kit-router@0.2.0.0/target.bend as Target 6 import bend-kit-json@0.5.1.0/json.bend as Json 7 import ./response.bend as Response 8 import ./input.bend as Input 9 import bend-kit-http@0.30.0.0/completion.bend as TransportCompletion 10 11 type ResponseError is Data: 12 InvalidResponse{} 13 InvalidRedirect{} 14 15 def validate.checked(valid: Bool, response: Http.Res) -> Result<&2, &1, ResponseError, Http.Res>: 16 match valid: 17 case True{}: 18 Done{response} 19 case False{}: 20 Fail{InvalidResponse{}} 21 22 def validate(response: Http.Res) -> Result<&2, &1, ResponseError, Http.Res>: 23 Http.Res{+status, +headers, body} = response 24 validate.checked(Response.valid(status, headers), Http.Res{status, headers, body}) 25 26 # The encoder is an explicit public projection, never record reflection. 27 def json(~T: Type, ~encode: T -> Json.Val, status: U32, value: T) -> Http.Res: 28 Http.Res{status, Http.set(Http.empty(), "content-type", "application/json"), Json.encode.bytes(encode(value))} 29 30 def text(status: U32, value: String) -> Http.Res: 31 Http.Res{status, Http.set(Http.empty(), "content-type", "text/plain; charset=utf-8"), Json.utf8(value)} 32 33 def raw(status: U32, body: Http.Body) -> Http.Res: 34 Http.Res{status, Http.empty(), body} 35 36 def empty(status: U32) -> Http.Res: 37 raw(status, Http.from_string("")) 38 39 def redirect.checked(valid: Bool, status: U32, location: String) -> Result<&2, &1, ResponseError, Http.Res>: 40 match valid: 41 case False{}: 42 Fail{InvalidRedirect{}} 43 case True{}: 44 Done{Http.Res{status, Http.set(Http.empty(), "location", location), Http.from_string("")}} 45 46 def redirect(+status: U32, +location: String) -> Result<&2, &1, ResponseError, Http.Res>: 47 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) 48 49 type Counts is Data: 50 Counts{capacity: Nat, in_use: Nat, completed: Nat, rejected: Nat} 51 52 type Outcome<-E: Data, -O: Data> is Data: 53 Success{value: O} 54 Expected{error: E} 55 Exhausted{} 56 Stopped{} 57 58 type CloseResult is Data: 59 Closed{} 60 Busy{counts: Counts} 61 62 type Message<-R: Type, -P: Data, -I: Data, -E: Data, -O: Data> is Type: 63 Submit{principal: P, input: I, reply: Chan(Outcome)} 64 Returned{resource: R} 65 Inspect{reply: Chan(Counts)} 66 Shutdown{reply: Chan(CloseResult)} 67 68 # Copy only this context, never the resources. The inbox bounds queued commands; 69 # callers must count blocked submissions inside their transport admission limit. 70 type Context<-R: Type, -P: Data, -I: Data, -E: Data, -O: Data> is Data: 71 Context{messages: Chan(Message)} 72 73 # The completion future has one affine owner; request contexts copy only inbox. 74 type Owner<-R: Type, -P: Data, -I: Data, -E: Data, -O: Data> is Type: 75 Owner{context: Context, finished: Chan(Unit)} 76 77 type OwnerClose<-R: Type, -P: Data, -I: Data, -E: Data, -O: Data> is Type: 78 OwnerClosed{} 79 OwnerBusy{owner: Owner, counts: Counts} 80 81 def owner.context(-R: Type, -P: Data, -I: Data, -E: Data, -O: Data, 82 owner: Owner 83 ) -> Owner & Context: 84 Owner{+context, finished} = owner 85 (Owner{context, finished}, context) 86 87 def outcome.value(-E: Data, -O: Data, result: Result<&2, &2, E, O>) -> Outcome: 88 match result: 89 case Fail{error}: 90 Expected{error} 91 case Done{value}: 92 Success{value} 93 94 # The resources return through the private owner protocol BEFORE a disposable 95 # caller reply. A closed caller reply cannot erase a handle or strand capacity. 96 def work.return(-R: Type, -P: Data, -I: Data, -E: Data, -O: Data, 97 messages: Chan(Message), reply: Chan(Outcome), 98 result: R & Result<&2, &2, E, O> 99 ) -> IO(Unit): 100 (returned, outcome) = result 101 do IO: 102 accepted : Bool <- Chan.send(Message, messages, Returned{returned}) 103 sent : Bool <- Chan.send(Outcome, reply, outcome.value(E, O, outcome)) 104 return Unit{} 105 106 def work(~R: Type, ~P: Data, ~I: Data, ~E: Data, ~O: Data, 107 ~handler: R -> P -> I -> IO(R & Result<&2, &2, E, O>), 108 resource: R, principal: P, input: I, 109 messages: Chan(Message), reply: Chan(Outcome) 110 ) -> IO(Unit): 111 do IO: 112 result : R & Result<&2, &2, E, O> <- handler(resource, principal, input) 113 work.return(R, P, I, E, O, messages, reply, result) 114 115 def dispose(~R: Type, ~destroy: R -> IO(Unit), resources: List) -> IO(Unit): 116 match resources: 117 case Nil{}: 118 IO.pure(Unit, Unit{}) 119 case Con{resource, rest}: 120 do IO: 121 destroy(resource) 122 dispose(~R, ~destroy, rest) 123 124 # Closing Base channels retains buffered messages. Drain them and answer stopped 125 # callers, rather than stranding accepted commands behind the close command. 126 def drain.message(~R: Type, ~P: Data, ~I: Data, ~E: Data, ~O: Data, 127 ~destroy: R -> IO(Unit), message: Message 128 ) -> IO(Unit): 129 match message: 130 case Submit{principal, input, reply}: 131 do IO: 132 sent : Bool <- Chan.send(Outcome, reply, Stopped{}) 133 return Unit{} 134 case Inspect{reply}: 135 Chan.close(Counts, reply) 136 case Shutdown{reply}: 137 do IO: 138 sent : Bool <- Chan.send(CloseResult, reply, Closed{}) 139 return Unit{} 140 case Returned{resource}: 141 destroy(resource) 142 143 def drain.step(~R: Type, ~P: Data, ~I: Data, ~E: Data, ~O: Data, 144 ~destroy: R -> IO(Unit), pending: Maybe<&1, Message>, 145 next: Unit -> IO(Unit) 146 ) -> IO(Unit): 147 match pending: 148 case None{}: 149 IO.pure(Unit, Unit{}) 150 case Some{message}: 151 do IO: 152 drain.message(~R, ~P, ~I, ~E, ~O, ~destroy, message) 153 next(Unit{}) 154 155 # The closed inbox contains at most room buffered messages. 156 def drain(~R: Type, ~P: Data, ~I: Data, ~E: Data, ~O: Data, 157 ~destroy: R -> IO(Unit), fuel: Nat, +messages: Chan(Message) 158 ) -> IO(Unit): 159 match fuel: 160 case 0n: 161 IO.pure(Unit, Unit{}) 162 case 1n+p: 163 do IO: 164 pending : Maybe<&1, Message> <- Chan.recv(Message, messages) 165 drain.step(~R, ~P, ~I, ~E, ~O, ~destroy, pending, u => drain(~R, ~P, ~I, ~E, ~O, ~destroy, p, messages)) 166 167 type OwnerStep<-R: Type, -P: Data, -I: Data, -E: Data, -O: Data> is Type: 168 Waiting{resources: List, counts: Counts} 169 Received{message: Message, counts: Counts, resources: List} 170 171 # IO.join closes a one-shot channel; the owner inbox must remain reusable. 172 def receive.value(-A: Type, value: Maybe<&1, A>) -> IO(A): 173 match value: 174 case None{}: 175 IO.die(A, 1, "camber internal channel closed unexpectedly") 176 case Some{message}: 177 IO.pure(A, message) 178 179 def receive(-A: Type, channel: Chan(A)) -> IO(A): 180 do IO: 181 value : Maybe<&1, A> <- Chan.recv(A, channel) 182 receive.value(A, value) 183 184 # Only idle close ends this loop. Busy close never waits on a stalled handler. 185 # @unsafe is solely the lifecycle receive loop, not a termination/proof claim. 186 @unsafe def owner(~R: Type, ~P: Data, ~I: Data, ~E: Data, ~O: Data, 187 ~handler: R -> P -> I -> IO(R & Result<&2, &2, E, O>), ~destroy: R -> IO(Unit), 188 +messages: Chan(Message), +room: U32, step: OwnerStep 189 ) -> IO(Unit): 190 match step: 191 case Waiting{resources, counts}: 192 do IO: 193 message : Message <- receive(Message, messages) 194 owner(~R, ~P, ~I, ~E, ~O, ~handler, ~destroy, messages, room, Received{message, counts, resources}) 195 case Received{message, counts, resources}: 196 match message: 197 case Returned{resource}: 198 Counts{capacity, in_use, completed, rejected} = counts 199 owner(~R, ~P, ~I, ~E, ~O, ~handler, ~destroy, messages, room, Waiting{resource <> resources, Counts{capacity, Nat.sub(in_use, 1n), 1n+completed, rejected}}) 200 case Inspect{reply}: 201 Counts{+capacity, +in_use, +completed, +rejected} = counts 202 do IO: 203 sent : Bool <- Chan.send(Counts, reply, Counts{capacity, in_use, completed, rejected}) 204 owner(~R, ~P, ~I, ~E, ~O, ~handler, ~destroy, messages, room, Waiting{resources, Counts{capacity, in_use, completed, rejected}}) 205 case Shutdown{reply}: 206 Counts{+capacity, in_use, +completed, +rejected} = counts 207 match in_use: 208 case 0n: 209 do IO: 210 dispose(~R, ~destroy, resources) 211 Chan.close(Message, messages) 212 sent : Bool <- Chan.send(CloseResult, reply, Closed{}) 213 drain(~R, ~P, ~I, ~E, ~O, ~destroy, U32.to_nat(room), messages) 214 case 1n+ +p: 215 do IO: 216 sent : Bool <- Chan.send(CloseResult, reply, Busy{Counts{capacity, 1n+p, completed, rejected}}) 217 owner(~R, ~P, ~I, ~E, ~O, ~handler, ~destroy, messages, room, Waiting{resources, Counts{capacity, 1n+p, completed, rejected}}) 218 case Submit{principal, input, reply}: 219 Counts{capacity, in_use, completed, rejected} = counts 220 match resources: 221 case Nil{}: 222 do IO: 223 sent : Bool <- Chan.send(Outcome, reply, Exhausted{}) 224 owner(~R, ~P, ~I, ~E, ~O, ~handler, ~destroy, messages, room, Waiting{Nil{}, Counts{capacity, in_use, completed, 1n+rejected}}) 225 case Con{resource, rest}: 226 do IO: 227 IO.spawn(Unit, work(~R, ~P, ~I, ~E, ~O, ~handler, resource, principal, input, messages, reply)) 228 owner(~R, ~P, ~I, ~E, ~O, ~handler, ~destroy, messages, room, Waiting{rest, Counts{capacity, 1n+in_use, completed, rejected}}) 229 230 def build.step(~R: Type, ~E: Data, ~destroy: R -> IO(Unit), 231 result: Result<&2, &1, E, R>, resources: List, 232 next: List -> IO(Result<&2, &1, E, List>) 233 ) -> IO(Result<&2, &1, E, List>): 234 match result: 235 case Fail{error}: 236 do IO>>: 237 dispose(~R, ~destroy, resources) 238 return Fail{error} 239 case Done{resource}: 240 next(resource <> resources) 241 242 def build(~K: Data, ~R: Type, ~E: Data, ~create: K -> Nat -> IO(Result<&2, &1, E, R>), ~destroy: R -> IO(Unit), 243 remaining: Nat, +config: K, resources: List 244 ) -> IO(Result<&2, &1, E, List>): 245 match remaining: 246 case 0n: 247 IO.pure(Result<&2, &1, E, List>, Done{resources}) 248 case 1n+ +p: 249 do IO>>: 250 result : Result<&2, &1, E, R> <- create(config, p) 251 build.step(~R, ~E, ~destroy, result, resources, next => build(~K, ~R, ~E, ~create, ~destroy, p, config, next)) 252 253 def start.ready(~R: Type, ~P: Data, ~I: Data, ~E: Data, ~O: Data, 254 ~handler: R -> P -> I -> IO(R & Result<&2, &2, E, O>), ~destroy: R -> IO(Unit), 255 capacity: Nat, +room: U32, result: Result<&2, &1, E, List> 256 ) -> IO(Result<&2, &1, E, Owner>): 257 match result: 258 case Fail{error}: 259 IO.pure(Result<&2, &1, E, Owner>, Fail{error}) 260 case Done{resources}: 261 do IO>>: 262 channel : Chan(Message) <- Chan.new(Message, room) 263 +messages : Chan(Message) = channel 264 finished : Chan(Unit) <- IO.fork(Unit, owner(~R, ~P, ~I, ~E, ~O, ~handler, ~destroy, messages, room, Waiting{resources, Counts{capacity, 0n, 0n, 0n}})) 265 return Done{Owner{Context{messages}, finished}} 266 267 # The initializer closes partial handles within a failed bundle; start closes 268 # all prior whole bundles. No workers exist until the complete set opens. 269 def start(~K: Data, ~R: Type, ~P: Data, ~I: Data, ~E: Data, ~O: Data, 270 ~create: K -> Nat -> IO(Result<&2, &1, E, R>), 271 ~handler: R -> P -> I -> IO(R & Result<&2, &2, E, O>), ~destroy: R -> IO(Unit), 272 config: K, +capacity: Nat, room: U32 273 ) -> IO(Result<&2, &1, E, Owner>): 274 do IO>>: 275 result : Result<&2, &1, E, List> <- build(~K, ~R, ~E, ~create, ~destroy, capacity, config, Nil{}) 276 start.ready(~R, ~P, ~I, ~E, ~O, ~handler, ~destroy, capacity, room, result) 277 278 def submit(-R: Type, -P: Data, -I: Data, -E: Data, -O: Data, 279 context: Context, principal: P, input: I, reply: Chan(Outcome) 280 ) -> IO(Bool): 281 Context{messages} = context 282 Chan.send(Message, messages, Submit{principal, input, reply}) 283 284 def call.accepted(-E: Data, -O: Data, accepted: Bool, +reply: Chan(Outcome)) -> IO(Outcome): 285 match accepted: 286 case False{}: 287 do IO>: 288 Chan.close(Outcome, reply) 289 return Stopped{} 290 case True{}: 291 do IO>: 292 result : Outcome <- IO.join(Outcome, reply) 293 Chan.close(Outcome, reply) 294 return result 295 296 def call(-R: Type, -P: Data, -I: Data, -E: Data, -O: Data, 297 context: Context, principal: P, input: I 298 ) -> IO(Outcome): 299 do IO>: 300 channel : Chan(Outcome) <- Chan.new(Outcome, 1) 301 +reply : Chan(Outcome) = channel 302 accepted : Bool <- submit(R, P, I, E, O, context, principal, input, reply) 303 call.accepted(E, O, accepted, reply) 304 305 def inspect.value(value: Maybe<&1, Counts>) -> Maybe<&2, Counts>: 306 match value: 307 case None{}: 308 None{} 309 case Some{counts}: 310 Some{counts} 311 312 def inspect.sent(sent: Bool, +reply: Chan(Counts)) -> IO(Maybe<&2, Counts>): 313 match sent: 314 case False{}: 315 do IO>: 316 Chan.close(Counts, reply) 317 return None{} 318 case True{}: 319 do IO>: 320 value : Maybe<&1, Counts> <- Chan.recv(Counts, reply) 321 Chan.close(Counts, reply) 322 return inspect.value(value) 323 324 def inspect(-R: Type, -P: Data, -I: Data, -E: Data, -O: Data, context: Context) -> IO(Maybe<&2, Counts>): 325 Context{messages} = context 326 do IO>: 327 channel : Chan(Counts) <- Chan.new(Counts, 1) 328 +reply : Chan(Counts) = channel 329 sent : Bool <- Chan.send(Message, messages, Inspect{reply}) 330 inspect.sent(sent, reply) 331 332 def close.sent(sent: Bool, +reply: Chan(CloseResult)) -> IO(CloseResult): 333 match sent: 334 case False{}: 335 do IO: 336 Chan.close(CloseResult, reply) 337 return Closed{} 338 case True{}: 339 do IO: 340 value : CloseResult <- IO.join(CloseResult, reply) 341 Chan.close(CloseResult, reply) 342 return value 343 344 def close.join(-R: Type, -P: Data, -I: Data, -E: Data, -O: Data, 345 owner: Owner 346 ) -> IO(OwnerClose): 347 Owner{context, finished} = owner 348 do IO>: 349 IO.join(Unit, finished) 350 return OwnerClosed{} 351 352 def close.completed(-R: Type, -P: Data, -I: Data, -E: Data, -O: Data, 353 result: CloseResult, owner: Owner 354 ) -> IO(OwnerClose): 355 match result: 356 case Closed{}: 357 close.join(R, P, I, E, O, owner) 358 case Busy{counts}: 359 IO.pure(OwnerClose, OwnerBusy{owner, counts}) 360 361 # Stop external admissions before close. Busy preserves live context/capacity; 362 # retry after admitted operations finish. Stalled operations remain observable. 363 def close(-R: Type, -P: Data, -I: Data, -E: Data, -O: Data, owner: Owner) -> IO(OwnerClose): 364 Owner{Context{+messages}, finished} = owner 365 do IO>: 366 channel : Chan(CloseResult) <- Chan.new(CloseResult, 1) 367 +reply : Chan(CloseResult) = channel 368 sent : Bool <- Chan.send(Message, messages, Shutdown{reply}) 369 result : CloseResult <- close.sent(sent, reply) 370 close.completed(R, P, I, E, O, result, Owner{Context{messages}, finished}) 371 372 # Policies are prepared Data, not callbacks. Later lifecycle stages can consume 373 # these root-to-route declarations without splitting patterns or finding groups. 374 type Group<-P: Data> is Data: 375 Group{id: U32, ancestors: List<&2, U32>, policy: P} 376 377 type GroupPlan<-P: Data> is Data: 378 GroupPlan{ids: List<&2, U32>, policies: List<&2, P>} 379 380 type Route<-A: Data, -P: Data> is Data: 381 Route{method: String, pattern: String, action: A, groups: List<&2, U32>, policy: P} 382 383 type Endpoint<-A: Data, -P: Data> is Data: 384 Endpoint{action: A, policies: List<&2, P>} 385 386 type Application<-A: Data, -C: Data, -P: Data> is Data: 387 Application{table: Router.Table>, context: C, root: P, groups: List<&2, GroupPlan

>} 388 389 type RegistrationError is Data: 390 RouteError{error: Router.Error} 391 InvalidGroups{groups: List<&2, U32>} 392 393 type Match<-P: Data> is Data: 394 Match{target: Target.Target, params: Map<&2, String>, groups: List<&2, U32>, method: String, pattern: String, policies: List<&2, P>} 395 396 def groups.equal(xs: List<&2, U32>, ys: List<&2, U32>) -> Bool: 397 match xs ys: 398 case Nil{} Nil{}: 399 True{} 400 case x <> xt y <> yt: 401 U32.is_eq(x, y) && groups.equal(xt, yt) 402 case _ _: 403 False{} 404 405 def group.pick(~P: Data, same: Bool, group: Group

, later: Unit -> Maybe<&2, Group

>) -> Maybe<&2, Group

>: 406 match same: 407 case True{}: 408 Some{group} 409 case False{}: 410 later(Unit{}) 411 412 def group.find(~P: Data, groups: List<&2, Group

>, +id: U32) -> Maybe<&2, Group

>: 413 match groups: 414 case Nil{}: 415 None{} 416 case Group{+here, ancestors, policy} <> rest: 417 group.pick(~P, U32.is_eq(here, id), Group{here, ancestors, policy}, u => group.find(~P, rest, id)) 418 419 def group.checked(~P: Data, same: Bool, policy: P) -> Maybe<&2, P>: 420 match same: 421 case False{}: 422 None{} 423 case True{}: 424 Some{policy} 425 426 def group.policy(~P: Data, found: Maybe<&2, Group

>, ancestors: List<&2, U32>) -> Maybe<&2, P>: 427 match found: 428 case None{}: 429 None{} 430 case Some{Group{id, expected, policy}}: 431 group.checked(~P, groups.equal(expected, ancestors), policy) 432 433 def groups.policies(~P: Data, ids: List<&2, U32>, +declared: List<&2, Group

>, +ancestors: List<&2, U32>) -> Maybe<&2, List<&2, P>>: 434 match ids: 435 case Nil{}: 436 Some{Nil{}} 437 case +id <> rest: 438 do Maybe<&2, List<&2, P>>: 439 policy : P <- group.policy(~P, group.find(~P, declared, id), ancestors) 440 policies : List<&2, P> <- groups.policies(~P, rest, declared, List.append(&2, U32, ancestors, [id])) 441 return policy <> policies 442 443 def groups.unique(~P: Data, found: Maybe<&2, Group

>) -> Bool: 444 match found: 445 case None{}: 446 True{} 447 case Some{group}: 448 False{} 449 450 def groups.valid(~P: Data, groups: List<&2, Group

>, +all: List<&2, Group

>) -> Bool: 451 match groups: 452 case Nil{}: 453 True{} 454 case Group{+id, +ancestors, policy} <> +rest: 455 chain = groups.policies(~P, List.append(&2, U32, ancestors, [id]), all, Nil{}) 456 groups.unique(~P, group.find(~P, rest, id)) && Maybe.is_some(&2, List<&2, P>, chain) && groups.valid(~P, rest, all) 457 458 def routes.policies(~P: Data, result: Maybe<&2, List<&2, P>>, ids: List<&2, U32>) -> Result<&2, &2, RegistrationError, List<&2, P>>: 459 match result: 460 case None{}: 461 Fail{InvalidGroups{ids}} 462 case Some{policies}: 463 Done{policies} 464 465 def routes.prepare(~A: Data, ~P: Data, routes: List<&2, Route>, +groups: List<&2, Group

>, +root: P) -> Result<&2, &2, RegistrationError, List<&2, Router.Entry>>>: 466 match routes: 467 case Nil{}: 468 Done{Nil{}} 469 case Route{method, pattern, action, +ids, policy} <> rest: 470 do Result<&2, &2, RegistrationError, List<&2, Router.Entry>>>: 471 policies : List<&2, P> <- routes.policies(~P, groups.policies(~P, ids, groups, Nil{}), ids) 472 entries : List<&2, Router.Entry>> <- routes.prepare(~A, ~P, rest, groups, root) 473 return Router.Entry{method, pattern, Endpoint{action, root <> List.append(&2, P, policies, [policy])}, ids} <> entries 474 475 def groups.prepare(~P: Data, groups: List<&2, Group

>, +all: List<&2, Group

>) -> Result<&2, &2, RegistrationError, List<&2, GroupPlan

>>: 476 match groups: 477 case Nil{}: 478 Done{Nil{}} 479 case Group{id, ancestors, policy} <> rest: 480 +ids = List.append(&2, U32, ancestors, [id]) 481 do Result<&2, &2, RegistrationError, List<&2, GroupPlan

>>: 482 policies : List<&2, P> <- routes.policies(~P, groups.policies(~P, ids, all, Nil{}), ids) 483 plans : List<&2, GroupPlan

> <- groups.prepare(~P, rest, all) 484 return GroupPlan{ids, policies} <> plans 485 486 def groups.select(~P: Data, same: Bool, policies: List<&2, P>, later: Unit -> List<&2, P>) -> List<&2, P>: 487 match same: 488 case True{}: policies 489 case False{}: later(Unit{}) 490 491 def groups.prepared(~P: Data, plans: List<&2, GroupPlan

>, +ids: List<&2, U32>) -> List<&2, P>: 492 match plans: 493 case Nil{}: 494 Nil{} 495 case GroupPlan{here, policies} <> rest: 496 groups.select(~P, groups.equal(here, ids), policies, u => groups.prepared(~P, rest, ids)) 497 498 def application.table(~A: Data, ~C: Data, ~P: Data, result: Result<&2, &2, Router.Error, Router.Table>>, context: C, root: P, groups: List<&2, GroupPlan

>) -> Result<&2, &2, RegistrationError, Application>: 499 match result: 500 case Fail{error}: 501 Fail{RouteError{error}} 502 case Done{table}: 503 Done{Application{table, context, root, groups}} 504 505 def application.valid(~A: Data, ~C: Data, ~P: Data, valid: Bool, routes: List<&2, Route>, +groups: List<&2, Group

>, context: C, +root: P) -> Result<&2, &2, RegistrationError, Application>: 506 match valid: 507 case False{}: 508 Fail{InvalidGroups{Nil{}}} 509 case True{}: 510 do Result<&2, &2, RegistrationError, Application>: 511 entries : List<&2, Router.Entry>> <- routes.prepare(~A, ~P, routes, groups, root) 512 plans : List<&2, GroupPlan

> <- groups.prepare(~P, groups, groups) 513 application.table(~A, ~C, ~P, Router.prepare(~Endpoint, entries), context, root, plans) 514 515 # Construction is pure and fallible; no listener or owner is started here. 516 def application(~A: Data, ~C: Data, ~P: Data, routes: List<&2, Route>, +groups: List<&2, Group

>, context: C, root: P) -> Result<&2, &2, RegistrationError, Application>: 517 application.valid(~A, ~C, ~P, groups.valid(~P, groups, groups), routes, groups, context, root) 518 519 def describe(~A: Data, ~C: Data, ~P: Data, app: Application) -> List<&2, Router.Description>: 520 Application{table, context, root, groups} = app 521 Router.describe(~Endpoint, table) 522 523 # A closed template can run repeatedly; an affine callback registry cannot. 524 def plain(~handler: Http.Req -> IO(Http.Res), req: Http.Req) -> IO(Result<&2, &1, ResponseError, Http.Res>): 525 do IO>: 526 response : Http.Res <- handler(req) 527 return validate(response) 528 529 type Policy<-H: Data> is Data: 530 Policy{id: U32, before: List<&2, H>, transforms: List<&2, H>} 531 532 def policy(~H: Data, id: U32, before: List<&2, H>, transforms: List<&2, H>) -> Policy: 533 Policy{id, before, List.reverse(&2, H, transforms)} 534 535 type Metadata is Data: 536 Metadata{method: String, target: String, headers: Map<&2, List<&2, String>>} 537 538 type Error<-E: Data> is Data: 539 ApplicationError{error: E} 540 Framework{status: U32, allow: String} 541 ResponseInvalid{} 542 543 # Adapt reusable input status failures to the existing one-pass dispatch mapper. 544 def input(~I: Type, ~E: Data, outcome: Result<&2, &1, U32, I>) -> Result<&2, &1, Error, I>: 545 match outcome: 546 case Fail{status}: Fail{Framework{status, ""}} 547 case Done{value}: Done{value} 548 549 def execute.decoded(~I: Type, ~S: Type, ~K: Data, ~E: Data, 550 ~handler: S -> K -> I -> IO(S & Result<&2, &1, Error, Http.Res>), 551 outcome: Result<&2, &1, Error, I>, state: S, config: K 552 ) -> IO(S & Result<&2, &1, Error, Http.Res>): 553 match outcome: 554 case Fail{error}: IO.pure(S & Result<&2, &1, Error, Http.Res>, (state, Fail{error})) 555 case Done{value}: handler(state, config, value) 556 557 # An executor, not a second dispatcher: call from dispatch's run template, after 558 # all applicable before hooks. Only validated typed input reaches business IO. 559 def execute(~I: Type, ~S: Type, ~K: Data, ~E: Data, ~H: Data, 560 ~decoder: K -> Match> -> Http.Req -> Result<&2, &1, Error, I>, 561 ~handler: S -> K -> I -> IO(S & Result<&2, &1, Error, Http.Res>), 562 state: S, +config: K, selected: Match>, req: Http.Req 563 ) -> IO(S & Result<&2, &1, Error, Http.Res>): 564 execute.decoded(~I, ~S, ~K, ~E, ~handler, decoder(config, selected, req), state, config) 565 566 type Step<-S: Type, -E: Data> is Type: 567 Continue{state: S} 568 Early{state: S, response: Http.Res} 569 Reject{state: S, error: Error} 570 571 type Completion<-S: Type, -H: Data> is Type: 572 Completed{state: S, response: Http.Res, entered: List<&2, Policy>, mapped: Bool, stopped: Bool} 573 574 # Application completion only: no socket write, duration, or peer-receipt claim. 575 def minimal() -> Http.Res: 576 empty(500) 577 578 def problem.allow(add: Bool, headers: Map<&2, List<&2, String>>, allow: String) -> Map<&2, List<&2, String>>: 579 match add: 580 case True{}: Http.set(headers, "allow", allow) 581 case False{}: headers 582 583 def problem.response(allow: String, response: Http.Res) -> Http.Res: 584 Http.Res{+status, headers, body} = response 585 Http.Res{status, problem.allow(U32.is_eq(status, 405), Http.set(headers, "content-type", "application/problem+json"), allow), body} 586 587 def problem(+status: U32, title: String, allow: String) -> Http.Res: 588 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))})]})) 589 590 def default.error(~E: Data, error: Error) -> Http.Res: 591 match error: 592 case Framework{status, allow}: 593 match status: 594 case 400: 595 problem(400, "Bad Request", allow) 596 case 404: 597 problem(404, "Not Found", allow) 598 case 405: 599 problem(405, "Method Not Allowed", allow) 600 case 415: 601 problem(415, "Unsupported Media Type", allow) 602 case _: 603 minimal() 604 case _: 605 minimal() 606 607 def default.mapper(~S: Type, ~K: Data, ~E: Data, state: S, config: K, error: Error) -> IO(S & Result<&2, &1, Error, Http.Res>): 608 IO.pure(S & Result<&2, &1, Error, Http.Res>, (state, Done{default.error(~E, error)})) 609 610 def mapped.checked(~S: Type, ~H: Data, state: S, entered: List<&2, Policy>, stopped: Bool, result: Result<&2, &1, ResponseError, Http.Res>) -> Completion: 611 match result: 612 case Fail{error}: 613 Completed{state, minimal(), entered, True{}, True{}} 614 case Done{response}: 615 Completed{state, response, entered, True{}, stopped} 616 617 def mapped.result(~S: Type, ~E: Data, ~H: Data, entered: List<&2, Policy>, stopped: Bool, result: S & Result<&2, &1, Error, Http.Res>) -> Completion: 618 (state, outcome) = result 619 match outcome: 620 case Fail{error}: 621 Completed{state, minimal(), entered, True{}, True{}} 622 case Done{response}: 623 mapped.checked(~S, ~H, state, entered, stopped, validate(response)) 624 625 def failed(~S: Type, ~K: Data, ~E: Data, ~H: Data, 626 ~mapper: S -> K -> Error -> IO(S & Result<&2, &1, Error, Http.Res>), 627 mapped: Bool, state: S, config: K, error: Error, entered: List<&2, Policy>, stopped: Bool 628 ) -> IO(Completion): 629 match mapped: 630 case True{}: 631 IO.pure(Completion, Completed{state, minimal(), entered, True{}, True{}}) 632 case False{}: 633 do IO>: 634 result : S & Result<&2, &1, Error, Http.Res> <- mapper(state, config, error) 635 return mapped.result(~S, ~E, ~H, entered, stopped, result) 636 637 def result(~S: Type, ~K: Data, ~E: Data, ~H: Data, 638 ~mapper: S -> K -> Error -> IO(S & Result<&2, &1, Error, Http.Res>), 639 config: K, entered: List<&2, Policy>, outcome: S & Result<&2, &1, Error, Http.Res> 640 ) -> IO(Completion): 641 (state, response) = outcome 642 match response: 643 case Fail{error}: 644 failed(~S, ~K, ~E, ~H, ~mapper, False{}, state, config, error, entered, False{}) 645 case Done{res}: 646 IO.pure(Completion, Completed{state, res, entered, False{}, False{}}) 647 648 def before.next(~S: Type, ~E: Data, step: Step, next: S -> IO(Step)) -> IO(Step): 649 match step: 650 case Continue{state}: 651 next(state) 652 case Early{state, response}: 653 IO.pure(Step, Early{state, response}) 654 case Reject{state, error}: 655 IO.pure(Step, Reject{state, error}) 656 657 def before(~S: Type, ~K: Data, ~E: Data, ~H: Data, 658 ~hook: H -> S -> K -> Metadata -> IO(Step), 659 hooks: List<&2, H>, state: S, +config: K, +meta: Metadata 660 ) -> IO(Step): 661 match hooks: 662 case Nil{}: 663 IO.pure(Step, Continue{state}) 664 case h <> rest: 665 do IO>: 666 step : Step <- hook(h, state, config, meta) 667 before.next(~S, ~E, step, s => before(~S, ~K, ~E, ~H, ~hook, rest, s, config, meta)) 668 669 def transformed(~S: Type, ~K: Data, ~E: Data, ~H: Data, 670 ~mapper: S -> K -> Error -> IO(S & Result<&2, &1, Error, Http.Res>), 671 config: K, entered: List<&2, Policy>, mapped: Bool, outcome: S & Result<&2, &1, Error, Http.Res> 672 ) -> IO(Completion): 673 (state, response) = outcome 674 match response: 675 case Fail{error}: 676 failed(~S, ~K, ~E, ~H, ~mapper, mapped, state, config, error, entered, True{}) 677 case Done{res}: 678 IO.pure(Completion, Completed{state, res, entered, mapped, False{}}) 679 680 def transforms(~S: Type, ~K: Data, ~E: Data, ~H: Data, 681 ~hook: H -> S -> K -> Http.Res -> IO(S & Result<&2, &1, Error, Http.Res>), 682 ~mapper: S -> K -> Error -> IO(S & Result<&2, &1, Error, Http.Res>), 683 hooks: List<&2, H>, +config: K, completion: Completion 684 ) -> IO(Completion): 685 match hooks: 686 case Nil{}: 687 IO.pure(Completion, completion) 688 case h <> rest: 689 match completion: 690 case Completed{state, response, entered, mapped, True{}}: 691 IO.pure(Completion, Completed{state, response, entered, mapped, True{}}) 692 case Completed{state, response, +entered, +mapped, False{}}: 693 do IO>: 694 changed : S & Result<&2, &1, Error, Http.Res> <- hook(h, state, config, response) 695 next : Completion <- transformed(~S, ~K, ~E, ~H, ~mapper, config, entered, mapped, changed) 696 transforms(~S, ~K, ~E, ~H, ~hook, ~mapper, rest, config, next) 697 698 def entered.step(~S: Type, ~K: Data, ~E: Data, ~H: Data, 699 ~mapper: S -> K -> Error -> IO(S & Result<&2, &1, Error, Http.Res>), 700 config: K, entered: List<&2, Policy>, body: Http.Body, step: Step, next: S -> List<&2, Policy> -> Http.Body -> IO(Completion) 701 ) -> IO(Completion): 702 match step: 703 case Continue{state}: 704 next(state, entered, body) 705 case Early{state, response}: 706 IO.pure(Completion, Completed{state, response, entered, False{}, False{}}) 707 case Reject{state, error}: 708 failed(~S, ~K, ~E, ~H, ~mapper, False{}, state, config, error, entered, False{}) 709 710 def scopes(~S: Type, ~K: Data, ~E: Data, ~H: Data, 711 ~before_hook: H -> S -> K -> Metadata -> IO(Step), 712 ~after_hook: H -> S -> K -> Http.Res -> IO(S & Result<&2, &1, Error, Http.Res>), 713 ~mapper: S -> K -> Error -> IO(S & Result<&2, &1, Error, Http.Res>), 714 policies: List<&2, Policy>, state: S, +config: K, +meta: Metadata, entered: List<&2, Policy>, body: Http.Body, 715 next: S -> List<&2, Policy> -> Http.Body -> IO(Completion) 716 ) -> IO(Completion): 717 match policies: 718 case Nil{}: 719 next(state, entered, body) 720 case Policy{+id, +hooks, +unwind} <> rest: 721 scope = {Policy{id, hooks, unwind} : Policy} 722 do IO>: 723 step : Step <- before(~S, ~K, ~E, ~H, ~before_hook, hooks, state, config, meta) 724 inner : Completion <- 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)) 725 transforms(~S, ~K, ~E, ~H, ~after_hook, ~mapper, unwind, config, inner) 726 727 def finish.checked(~S: Type, ~K: Data, ~E: Data, ~H: Data, 728 ~mapper: S -> K -> Error -> IO(S & Result<&2, &1, Error, Http.Res>), 729 state: S, config: K, entered: List<&2, Policy>, mapped: Bool, stopped: Bool, checked: Result<&2, &1, ResponseError, Http.Res> 730 ) -> IO(Completion): 731 match checked: 732 case Done{response}: 733 IO.pure(Completion, Completed{state, response, entered, mapped, stopped}) 734 case Fail{error}: 735 failed(~S, ~K, ~E, ~H, ~mapper, mapped, state, config, ResponseInvalid{}, entered, True{}) 736 737 def finish(~S: Type, ~K: Data, ~E: Data, ~H: Data, 738 ~mapper: S -> K -> Error -> IO(S & Result<&2, &1, Error, Http.Res>), 739 config: K, completion: Completion 740 ) -> IO(Completion): 741 Completed{state, response, entered, mapped, stopped} = completion 742 finish.checked(~S, ~K, ~E, ~H, ~mapper, state, config, entered, mapped, stopped, validate(response)) 743 744 def policies.tail(~H: Data, policies: List<&2, Policy>) -> List<&2, Policy>: 745 match policies: 746 case Nil{}: 747 Nil{} 748 case root <> rest: 749 rest 750 751 752 def endpoint(~A: Data, ~S: Type, ~K: Data, ~E: Data, ~H: Data, 753 ~run: A -> S -> K -> Match> -> Http.Req -> IO(S & Result<&2, &1, Error, Http.Res>), 754 ~mapper: S -> K -> Error -> IO(S & Result<&2, &1, Error, Http.Res>), 755 action: A, state: S, +config: K, selected: Match>, meta: Metadata, entered: List<&2, Policy>, body: Http.Body 756 ) -> IO(Completion): 757 Metadata{method, target, headers} = meta 758 do IO>: 759 outcome : S & Result<&2, &1, Error, Http.Res> <- run(action, state, config, selected, Http.Req{method, target, headers, body}) 760 result(~S, ~K, ~E, ~H, ~mapper, config, entered, outcome) 761 762 def framework(~S: Type, ~K: Data, ~E: Data, ~H: Data, 763 ~mapper: S -> K -> Error -> IO(S & Result<&2, &1, Error, Http.Res>), 764 +status: U32, allow: String, state: S, config: K, entered: List<&2, Policy>, body: Http.Body 765 ) -> IO(Completion): 766 match status: 767 case 204: 768 IO.pure(Completion, Completed{state, Http.Res{204, Http.set(Http.empty(), "allow", allow), Http.from_string("")}, entered, False{}, False{}}) 769 case _: 770 failed(~S, ~K, ~E, ~H, ~mapper, False{}, state, config, Framework{status, allow}, entered, False{}) 771 772 def choice(~A: Data, ~S: Type, ~K: Data, ~E: Data, ~H: Data, 773 ~before_hook: H -> S -> K -> Metadata -> IO(Step), 774 ~after_hook: H -> S -> K -> Http.Res -> IO(S & Result<&2, &1, Error, Http.Res>), 775 ~run: A -> S -> K -> Match> -> Http.Req -> IO(S & Result<&2, &1, Error, Http.Res>), 776 ~mapper: S -> K -> Error -> IO(S & Result<&2, &1, Error, Http.Res>), 777 selected: Router.Choice>>, target: Target.Target, 778 groups: List<&2, GroupPlan>>, state: S, +config: K, +meta: Metadata, entered: List<&2, Policy>, body: Http.Body 779 ) -> IO(Completion): 780 match selected: 781 case Router.NotFound{}: 782 framework(~S, ~K, ~E, ~H, ~mapper, 404, "", state, config, entered, body) 783 case Router.MethodMissing{ids, allow}: 784 policies = groups.prepared(~Policy, groups, ids) 785 scopes(~S, ~K, ~E, ~H, ~before_hook, ~after_hook, ~mapper, policies, state, config, meta, entered, body, 786 s => entered => b => framework(~S, ~K, ~E, ~H, ~mapper, 405, allow, s, config, entered, b)) 787 case Router.Options{ids, allow}: 788 policies = groups.prepared(~Policy, groups, ids) 789 scopes(~S, ~K, ~E, ~H, ~before_hook, ~after_hook, ~mapper, policies, state, config, meta, entered, body, 790 s => entered => b => framework(~S, ~K, ~E, ~H, ~mapper, 204, allow, s, config, entered, b)) 791 case Router.Found{Endpoint{action, +policies}, params, ids, method, pattern}: 792 selected = {Match{target, params, ids, method, pattern, policies} : Match>} 793 scopes(~S, ~K, ~E, ~H, ~before_hook, ~after_hook, ~mapper, policies.tail(~H, policies), state, config, meta, entered, body, 794 s => entered => b => endpoint(~A, ~S, ~K, ~E, ~H, ~run, ~mapper, action, s, config, selected, meta, entered, b)) 795 796 def metadata.authority(authority: Maybe<&2, String>, meta: Metadata) -> Metadata: 797 match authority: 798 case None{}: 799 meta 800 case Some{host}: 801 Metadata{method, target, headers} = meta 802 Metadata{method, target, Http.set(headers, "host", host)} 803 804 def resolved(~A: Data, ~S: Type, ~K: Data, ~E: Data, ~H: Data, 805 ~before_hook: H -> S -> K -> Metadata -> IO(Step), 806 ~after_hook: H -> S -> K -> Http.Res -> IO(S & Result<&2, &1, Error, Http.Res>), 807 ~run: A -> S -> K -> Match> -> Http.Req -> IO(S & Result<&2, &1, Error, Http.Res>), 808 ~mapper: S -> K -> Error -> IO(S & Result<&2, &1, Error, Http.Res>), 809 outcome: Result<&2, &2, Router.Error, Router.Resolved>>>, 810 groups: List<&2, GroupPlan>>, state: S, config: K, meta: Metadata, entered: List<&2, Policy>, body: Http.Body 811 ) -> IO(Completion): 812 match outcome: 813 case Fail{error}: 814 framework(~S, ~K, ~E, ~H, ~mapper, 400, "", state, config, entered, body) 815 case Done{Router.Resolved{+target, selected}}: 816 Target.Target{segments, query, authority, star} = target 817 choice(~A, ~S, ~K, ~E, ~H, ~before_hook, ~after_hook, ~run, ~mapper, selected, target, groups, state, config, metadata.authority(authority, meta), entered, body) 818 819 def dispatch(~A: Data, ~S: Type, ~K: Data, ~E: Data, ~H: Data, 820 ~before_hook: H -> S -> K -> Metadata -> IO(Step), 821 ~after_hook: H -> S -> K -> Http.Res -> IO(S & Result<&2, &1, Error, Http.Res>), 822 ~run: A -> S -> K -> Match> -> Http.Req -> IO(S & Result<&2, &1, Error, Http.Res>), 823 ~mapper: S -> K -> Error -> IO(S & Result<&2, &1, Error, Http.Res>), 824 app: Application>, state: S, req: Http.Req 825 ) -> IO(Completion): 826 Application{table, +config, root, groups} = app 827 Http.Req{+method, +path, +headers, body} = req 828 +meta = {Metadata{method, path, headers} : Metadata} 829 do IO>: 830 completion : Completion <- scopes(~S, ~K, ~E, ~H, ~before_hook, ~after_hook, ~mapper, [root], state, config, meta, Nil{}, body, 831 s => entered => b => resolved(~A, ~S, ~K, ~E, ~H, ~before_hook, ~after_hook, ~run, ~mapper, 832 Router.resolve(~Endpoint>, table, method, path), groups, s, config, meta, entered, b)) 833 finish(~S, ~K, ~E, ~H, ~mapper, config, completion) 834 835 # The wrapper owns both pipes until its admitted operation really returns. 836 # Only disposable HTTP packed buffers cross them, never external handles. 837 type BufferedRequest is Data: 838 BufferedRequest{metadata: Metadata, body: Chan(Http.Body), response: Chan(Http.Res)} 839 840 type ApplicationReport<-H: Data> is Data: 841 Dispatched{entered: List<&2, Policy>, mapped: Bool, stopped: Bool} 842 CapacityRejected{} 843 844 type ServingContext<-A: Data, -S: Type, -K: Data, -H: Data> is Data: 845 ServingContext{application: Application>, 846 owner: Context>, BufferedRequest, Unit, ApplicationReport>} 847 848 type Server<-A: Data, -S: Type, -K: Data, -H: Data> is Type: 849 Server{transport: Http.Server>, 850 owner: Owner>, BufferedRequest, Unit, ApplicationReport>} 851 852 type StartupError is Data: 853 RegistrationFailed{error: RegistrationError} 854 TransportFailed{error: Http.StartupError} 855 EmptyBundles{} 856 857 type ServerExit<-A: Data, -S: Type, -K: Data, -H: Data> is Type: 858 ServerExit{transport: Http.ServerExit, application: OwnerClose>, BufferedRequest, Unit, ApplicationReport>} 859 860 def server.config(port: U32) -> Http.ServerConfig: 861 Http.ServerConfig{"127.0.0.1", port, 1048576, 65536, 128, 128, 128, 5000, 30000, 30000, 30000} 862 863 def server.bundles.cons(~S: Type, resource: S, counted: List & Nat) -> List & Nat: 864 (returned, count) = counted 865 (resource <> returned, 1n+count) 866 867 def server.bundles(~S: Type, resources: List) -> List & Nat: 868 match resources: 869 case Nil{}: (Nil{}, 0n) 870 case resource <> rest: 871 server.bundles.cons(~S, resource, server.bundles(~S, rest)) 872 873 def server.work.completed(~S: Type, ~H: Data, response_channel: Chan(Http.Res), 874 completion: Completion 875 ) -> IO(S & Result<&2, &2, Unit, ApplicationReport>): 876 Completed{state, response, entered, mapped, stopped} = completion 877 do IO>>: 878 sent : Bool <- Chan.send(Http.Res, response_channel, response) 879 return (state, Done{Dispatched{entered, mapped, stopped}}) 880 881 def server.work(~A: Data, ~S: Type, ~K: Data, ~E: Data, ~H: Data, 882 ~before_hook: H -> S -> K -> Metadata -> IO(Step), 883 ~after_hook: H -> S -> K -> Http.Res -> IO(S & Result<&2, &1, Error, Http.Res>), 884 ~run: A -> S -> K -> Match> -> Http.Req -> IO(S & Result<&2, &1, Error, Http.Res>), 885 ~mapper: S -> K -> Error -> IO(S & Result<&2, &1, Error, Http.Res>), 886 state: S, app: Application>, input: BufferedRequest 887 ) -> IO(S & Result<&2, &2, Unit, ApplicationReport>): 888 BufferedRequest{Metadata{method, target, headers}, body_channel, response_channel} = input 889 do IO>>: 890 body : Http.Body <- receive(Http.Body, body_channel) 891 completion : Completion <- dispatch(~A, ~S, ~K, ~E, ~H, ~before_hook, ~after_hook, ~run, ~mapper, 892 app, state, Http.Req{method, target, headers, body}) 893 server.work.completed(~S, ~H, response_channel, completion) 894 895 def server.response(~H: Data, 896 ~done: TransportCompletion.Completion> -> IO(Unit), 897 outcome: Outcome>, +body: Chan(Http.Body), +response: Chan(Http.Res) 898 ) -> IO(Http.Reply): 899 match outcome: 900 case Success{report}: 901 do IO: 902 result : Http.Res <- receive(Http.Res, response) 903 Chan.close(Http.Body, body) 904 Chan.close(Http.Res, response) 905 return Http.reply.complete(~ApplicationReport, ~done, report, result) 906 case _: 907 do IO: 908 # Closing alone retains buffered values in Base. Consume the rejected 909 # body before closing; the single room1 send has already completed. 910 discarded : Http.Body <- receive(Http.Body, body) 911 Chan.close(Http.Body, body) 912 Chan.close(Http.Res, response) 913 return Http.reply.complete(~ApplicationReport, ~done, CapacityRejected{}, 914 Http.Res{503, Http.set(Http.empty(), "connection", "close"), Http.from_string("")}) 915 916 def server.handle(~A: Data, ~S: Type, ~K: Data, ~H: Data, 917 ~done: TransportCompletion.Completion> -> IO(Unit), 918 context: ServingContext, req: Http.Req 919 ) -> IO(Http.Reply): 920 ServingContext{app, owner} = context 921 Http.Req{method, target, headers, body} = req 922 do IO: 923 +body_channel : Chan(Http.Body) <- Chan.new(Http.Body, 1) 924 +response_channel : Chan(Http.Res) <- Chan.new(Http.Res, 1) 925 sent : Bool <- Chan.send(Http.Body, body_channel, body) 926 outcome : Outcome> <- call(S, Application>, BufferedRequest, Unit, ApplicationReport, 927 owner, app, BufferedRequest{Metadata{method, target, headers}, body_channel, response_channel}) 928 server.response(~H, ~done, outcome, body_channel, response_channel) 929 930 931 def server.started(~A: Data, ~S: Type, ~K: Data, ~H: Data, 932 ~work: S -> Application> -> BufferedRequest -> IO(S & Result<&2, &2, Unit, ApplicationReport>), 933 ~destroy: S -> IO(Unit), 934 +context: Context>, BufferedRequest, Unit, ApplicationReport>, 935 room: U32, capacity: Nat, 936 started: List & Result<&2, &1, Http.StartupError, Http.Server>> 937 ) -> IO(Result<&2, &1, StartupError, Server>): 938 Context{+messages} = context 939 (resources, result) = started 940 match result: 941 case Fail{error}: 942 do IO>>: 943 dispose(~S, ~destroy, resources) 944 Chan.close(Message>, BufferedRequest, Unit, ApplicationReport>, messages) 945 return Fail{TransportFailed{error}} 946 case Done{transport}: 947 do IO>>: 948 finished : Chan(Unit) <- IO.fork(Unit, owner(~S, ~Application>, ~BufferedRequest, ~Unit, ~ApplicationReport, 949 ~work, ~destroy, messages, room, Waiting{resources, Counts{capacity, 0n, 0n, 0n}})) 950 return Done{Server{transport, Owner{Context{messages}, finished}}} 951 952 def server.prepared(~A: Data, ~S: Type, ~K: Data, ~H: Data, 953 ~work: S -> Application> -> BufferedRequest -> IO(S & Result<&2, &2, Unit, ApplicationReport>), 954 ~destroy: S -> IO(Unit), app: Application>, +config: Http.ServerConfig, resources: List & Nat 955 ) -> IO(Result<&2, &1, StartupError, Server>): 956 Http.ServerConfig{host, port, body, headers, connections, requests, +buffered, hm, bm, im, wm} = config 957 (bundles, capacity) = resources 958 match capacity: 959 case 0n: 960 do IO>>: 961 dispose(~S, ~destroy, bundles) 962 return Fail{EmptyBundles{}} 963 case 1n+ +rest: 964 do IO>>: 965 messages : Chan(Message>, BufferedRequest, Unit, ApplicationReport>) <- 966 Chan.new(Message>, BufferedRequest, Unit, ApplicationReport>, buffered) 967 +context : Context>, BufferedRequest, Unit, ApplicationReport> = Context{messages} 968 started : List & Result<&2, &1, Http.StartupError, Http.Server>> <- 969 Http.server.start(~ServingContext, ~List, ServingContext{app, context}, bundles, config) 970 server.started(~A, ~S, ~K, ~H, ~work, ~destroy, context, buffered, 1n+rest, started) 971 972 def server.valid(~A: Data, ~S: Type, ~K: Data, ~H: Data, 973 ~work: S -> Application> -> BufferedRequest -> IO(S & Result<&2, &2, Unit, ApplicationReport>), 974 ~destroy: S -> IO(Unit), valid: Bool, app: Application>, config: Http.ServerConfig, resources: List 975 ) -> IO(Result<&2, &1, StartupError, Server>): 976 match valid: 977 case False{}: 978 do IO>>: 979 dispose(~S, ~destroy, resources) 980 return Fail{TransportFailed{Http.InvalidConfig{}}} 981 case True{}: 982 server.prepared(~A, ~S, ~K, ~H, ~work, ~destroy, app, config, server.bundles(~S, resources)) 983 984 def server.registered(~A: Data, ~S: Type, ~K: Data, ~H: Data, 985 ~work: S -> Application> -> BufferedRequest -> IO(S & Result<&2, &2, Unit, ApplicationReport>), 986 ~destroy: S -> IO(Unit), registration: Result<&2, &2, RegistrationError, Application>>, 987 +config: Http.ServerConfig, resources: List 988 ) -> IO(Result<&2, &1, StartupError, Server>): 989 match registration: 990 case Fail{error}: 991 do IO>>: 992 dispose(~S, ~destroy, resources) 993 return Fail{RegistrationFailed{error}} 994 case Done{app}: 995 server.valid(~A, ~S, ~K, ~H, ~work, ~destroy, Http.server.config.valid(config), app, config, resources) 996 997 def server.start(~A: Data, ~S: Type, ~K: Data, ~E: Data, ~H: Data, 998 ~before_hook: H -> S -> K -> Metadata -> IO(Step), 999 ~after_hook: H -> S -> K -> Http.Res -> IO(S & Result<&2, &1, Error, Http.Res>), 1000 ~run: A -> S -> K -> Match> -> Http.Req -> IO(S & Result<&2, &1, Error, Http.Res>), 1001 ~mapper: S -> K -> Error -> IO(S & Result<&2, &1, Error, Http.Res>), 1002 ~destroy: S -> IO(Unit), 1003 registration: Result<&2, &2, RegistrationError, Application>>, 1004 config: Http.ServerConfig, resources: List 1005 ) -> IO(Result<&2, &1, StartupError, Server>): 1006 server.registered(~A, ~S, ~K, ~H, 1007 ~(state => app => input => server.work(~A, ~S, ~K, ~E, ~H, ~before_hook, ~after_hook, ~run, ~mapper, state, app, input)), 1008 ~destroy, registration, config, resources) 1009 1010 def server.control.result(~A: Data, ~S: Type, ~K: Data, ~H: Data, 1011 controlled: Http.Server> & Http.ServerControl, 1012 owner: Owner>, BufferedRequest, Unit, ApplicationReport> 1013 ) -> Server & Http.ServerControl: 1014 (returned, control) = controlled 1015 (Server{returned, owner}, control) 1016 1017 def server.control(~A: Data, ~S: Type, ~K: Data, ~H: Data, server: Server) -> Server & Http.ServerControl: 1018 Server{transport, owner} = server 1019 server.control.result(~A, ~S, ~K, ~H, Http.server.control(~ServingContext, transport), owner) 1020 1021 def server.observer.result(~A: Data, ~S: Type, ~K: Data, ~H: Data, 1022 observed: Http.Server> & Http.ServerStats, 1023 owner: Owner>, BufferedRequest, Unit, ApplicationReport> 1024 ) -> Server & Http.ServerStats: 1025 (returned, stats) = observed 1026 (Server{returned, owner}, stats) 1027 1028 def server.observer(~A: Data, ~S: Type, ~K: Data, ~H: Data, server: Server) -> Server & Http.ServerStats: 1029 Server{transport, owner} = server 1030 server.observer.result(~A, ~S, ~K, ~H, Http.server.observer(~ServingContext, transport), owner) 1031 1032 def server.dependencies(~A: Data, ~S: Type, ~K: Data, ~H: Data, server: Server 1033 ) -> Server & Context>, BufferedRequest, Unit, ApplicationReport>: 1034 Server{transport, Owner{+context, finished}} = server 1035 (Server{transport, Owner{context, finished}}, context) 1036 1037 def server.run(~A: Data, ~S: Type, ~K: Data, ~H: Data, 1038 ~done: TransportCompletion.Completion> -> IO(Unit), 1039 ~observe: U32 -> TransportCompletion.Outcome -> IO(Unit), 1040 server: Server 1041 ) -> IO(ServerExit): 1042 Server{transport, owner} = server 1043 do IO>: 1044 exited : Http.ServerExit <- Http.server.run(~ServingContext, 1045 ~(context => req => server.handle(~A, ~S, ~K, ~H, ~done, context, req)), 1046 ~(context => status => outcome => observe(status, outcome)), transport) 1047 closed : OwnerClose>, BufferedRequest, Unit, ApplicationReport> <- close(S, Application>, BufferedRequest, Unit, ApplicationReport, owner) 1048 return ServerExit{exited, closed} 1049 1050 # Without starting the run loop, the caller still explicitly drains transport 1051 # and joins application cleanup. A stop request alone is never completion. 1052 def server.close(~A: Data, ~S: Type, ~K: Data, ~H: Data, server: Server) -> IO(ServerExit): 1053 Server{transport, owner} = server 1054 do IO>: 1055 counts : Http.ServerCounts <- Http.server.close(~ServingContext, transport) 1056 closed : OwnerClose>, BufferedRequest, Unit, ApplicationReport> <- close(S, Application>, BufferedRequest, Unit, ApplicationReport, owner) 1057 return ServerExit{Http.ServerStopped{counts}, closed} 1058 1059 def serve.started(~A: Data, ~S: Type, ~K: Data, ~H: Data, 1060 ~done: TransportCompletion.Completion> -> IO(Unit), 1061 ~observe: U32 -> TransportCompletion.Outcome -> IO(Unit), 1062 started: Result<&2, &1, StartupError, Server> 1063 ) -> IO(Result<&2, &1, StartupError, ServerExit>): 1064 match started: 1065 case Fail{error}: IO.pure(Result<&2, &1, StartupError, ServerExit>, Fail{error}) 1066 case Done{server}: 1067 do IO>>: 1068 exited : ServerExit <- server.run(~A, ~S, ~K, ~H, ~done, ~observe, server) 1069 return Done{exited} 1070 1071 # Owners that need readiness/control use server.start then server.run instead. 1072 def serve(~A: Data, ~S: Type, ~K: Data, ~E: Data, ~H: Data, 1073 ~before_hook: H -> S -> K -> Metadata -> IO(Step), 1074 ~after_hook: H -> S -> K -> Http.Res -> IO(S & Result<&2, &1, Error, Http.Res>), 1075 ~run: A -> S -> K -> Match> -> Http.Req -> IO(S & Result<&2, &1, Error, Http.Res>), 1076 ~mapper: S -> K -> Error -> IO(S & Result<&2, &1, Error, Http.Res>), 1077 ~destroy: S -> IO(Unit), 1078 ~done: TransportCompletion.Completion> -> IO(Unit), 1079 ~observe: U32 -> TransportCompletion.Outcome -> IO(Unit), 1080 registration: Result<&2, &2, RegistrationError, Application>>, 1081 config: Http.ServerConfig, resources: List 1082 ) -> IO(Result<&2, &1, StartupError, ServerExit>): 1083 do IO>>: 1084 started : Result<&2, &1, StartupError, Server> <- 1085 server.start(~A, ~S, ~K, ~E, ~H, ~before_hook, ~after_hook, ~run, ~mapper, ~destroy, registration, config, resources) 1086 serve.started(~A, ~S, ~K, ~H, ~done, ~observe, started)