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implement non-blocking unary request server runtime
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98 changes: 98 additions & 0 deletions
98
runtime/src/main/scala/fs2/grpc/server/internal/Fs2ServerCall.scala
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,98 @@ | ||
| /* | ||
| * Copyright (c) 2018 Gary Coady / Fs2 Grpc Developers | ||
| * | ||
| * Permission is hereby granted, free of charge, to any person obtaining a copy of | ||
| * this software and associated documentation files (the "Software"), to deal in | ||
| * the Software without restriction, including without limitation the rights to | ||
| * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of | ||
| * the Software, and to permit persons to whom the Software is furnished to do so, | ||
| * subject to the following conditions: | ||
| * | ||
| * The above copyright notice and this permission notice shall be included in all | ||
| * copies or substantial portions of the Software. | ||
| * | ||
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS | ||
| * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR | ||
| * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER | ||
| * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | ||
| * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. | ||
| */ | ||
|
|
||
| package fs2.grpc.server.internal | ||
|
|
||
| import cats.effect._ | ||
| import cats.effect.std.Dispatcher | ||
| import fs2._ | ||
| import fs2.grpc.server.ServerCallOptions | ||
| import io.grpc._ | ||
|
|
||
| private[server] object Fs2ServerCall { | ||
| type Cancel = SyncIO[Unit] | ||
|
|
||
| def setup[I, O]( | ||
| options: ServerCallOptions, | ||
| call: ServerCall[I, O] | ||
| ): SyncIO[Fs2ServerCall[I, O]] = | ||
| SyncIO { | ||
| call.setMessageCompression(options.messageCompression) | ||
| options.compressor.map(_.name).foreach(call.setCompression) | ||
| new Fs2ServerCall[I, O](call) | ||
| } | ||
| } | ||
|
|
||
| private[server] final class Fs2ServerCall[Request, Response]( | ||
| call: ServerCall[Request, Response] | ||
| ) { | ||
|
|
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| import Fs2ServerCall.Cancel | ||
|
|
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| def stream[F[_]](response: Stream[F, Response], dispatcher: Dispatcher[F])(implicit F: Sync[F]): SyncIO[Cancel] = | ||
| run( | ||
| response.pull.peek1 | ||
| .flatMap { | ||
| case Some((_, stream)) => | ||
| Pull.suspend { | ||
| call.sendHeaders(new Metadata()) | ||
| stream.map(call.sendMessage).pull.echo | ||
| } | ||
| case None => Pull.done | ||
| } | ||
| .stream | ||
| .compile | ||
| .drain, | ||
| dispatcher | ||
| ) | ||
|
|
||
| def unary[F[_]](response: F[Response], dispatcher: Dispatcher[F])(implicit F: Sync[F]): SyncIO[Cancel] = | ||
| run( | ||
| F.map(response) { message => | ||
| call.sendHeaders(new Metadata()) | ||
| call.sendMessage(message) | ||
| }, | ||
| dispatcher | ||
| ) | ||
|
|
||
| def request(n: Int): SyncIO[Unit] = | ||
| SyncIO(call.request(n)) | ||
|
|
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| def close(status: Status, metadata: Metadata): SyncIO[Unit] = | ||
| SyncIO(call.close(status, metadata)) | ||
|
|
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| private def run[F[_]](completed: F[Unit], dispatcher: Dispatcher[F])(implicit F: Sync[F]): SyncIO[Cancel] = { | ||
| SyncIO { | ||
| val cancel = dispatcher.unsafeRunCancelable(F.guaranteeCase(completed) { | ||
| case Outcome.Succeeded(_) => close(Status.OK, new Metadata()).to[F] | ||
| case Outcome.Errored(e) => handleError(e).to[F] | ||
| case Outcome.Canceled() => close(Status.CANCELLED, new Metadata()).to[F] | ||
| }) | ||
| SyncIO(cancel()).void | ||
| } | ||
| } | ||
|
|
||
| private def handleError(t: Throwable): SyncIO[Unit] = t match { | ||
| case ex: StatusException => close(ex.getStatus, Option(ex.getTrailers).getOrElse(new Metadata())) | ||
| case ex: StatusRuntimeException => close(ex.getStatus, Option(ex.getTrailers).getOrElse(new Metadata())) | ||
| case ex => close(Status.INTERNAL.withDescription(ex.getMessage).withCause(ex), new Metadata()) | ||
| } | ||
| } |
128 changes: 128 additions & 0 deletions
128
runtime/src/main/scala/fs2/grpc/server/internal/Fs2UnaryServerCallHandler.scala
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,128 @@ | ||
| /* | ||
| * Copyright (c) 2018 Gary Coady / Fs2 Grpc Developers | ||
| * | ||
| * Permission is hereby granted, free of charge, to any person obtaining a copy of | ||
| * this software and associated documentation files (the "Software"), to deal in | ||
| * the Software without restriction, including without limitation the rights to | ||
| * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of | ||
| * the Software, and to permit persons to whom the Software is furnished to do so, | ||
| * subject to the following conditions: | ||
| * | ||
| * The above copyright notice and this permission notice shall be included in all | ||
| * copies or substantial portions of the Software. | ||
| * | ||
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS | ||
| * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR | ||
| * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER | ||
| * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | ||
| * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. | ||
| */ | ||
|
|
||
| package fs2.grpc.server.internal | ||
|
|
||
| import cats.effect.Async | ||
| import cats.effect.Ref | ||
| import cats.effect.Sync | ||
| import cats.effect.SyncIO | ||
| import cats.effect.std.Dispatcher | ||
| import fs2.grpc.server.ServerCallOptions | ||
| import fs2.grpc.server.ServerOptions | ||
| import io.grpc._ | ||
|
|
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| private[server] object Fs2UnaryServerCallHandler { | ||
|
|
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| import Fs2ServerCall.Cancel | ||
|
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| sealed trait CallerState[A] | ||
| object CallerState { | ||
| def init[A](cb: A => SyncIO[Cancel]): SyncIO[Ref[SyncIO, CallerState[A]]] = | ||
| Ref[SyncIO].of[CallerState[A]](PendingMessage(cb)) | ||
| } | ||
| case class PendingMessage[A](callback: A => SyncIO[Cancel]) extends CallerState[A] { | ||
| def receive(a: A): PendingHalfClose[A] = PendingHalfClose(callback, a) | ||
| } | ||
| case class PendingHalfClose[A](callback: A => SyncIO[Cancel], received: A) extends CallerState[A] { | ||
| def call(): SyncIO[Called[A]] = callback(received).map(Called.apply) | ||
| } | ||
| case class Called[A](cancel: Cancel) extends CallerState[A] | ||
| case class Cancelled[A]() extends CallerState[A] | ||
|
|
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| private def mkListener[Request, Response]( | ||
| call: Fs2ServerCall[Request, Response], | ||
| state: Ref[SyncIO, CallerState[Request]] | ||
| ): ServerCall.Listener[Request] = | ||
| new ServerCall.Listener[Request] { | ||
| override def onCancel(): Unit = | ||
| state.get | ||
| .flatMap { | ||
| case Called(cancel) => cancel >> state.set(Cancelled()) | ||
| case _ => SyncIO.unit | ||
| } | ||
| .unsafeRunSync() | ||
|
|
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| override def onMessage(message: Request): Unit = | ||
| state.get | ||
| .flatMap { | ||
| case s: PendingMessage[Request] => | ||
| state.set(s.receive(message)) | ||
| case _: PendingHalfClose[Request] => | ||
| sendError(Status.INTERNAL.withDescription("Too many requests")) | ||
| case _ => | ||
| SyncIO.unit | ||
| } | ||
| .unsafeRunSync() | ||
|
|
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| override def onHalfClose(): Unit = | ||
| state.get | ||
| .flatMap { | ||
| case s: PendingHalfClose[Request] => | ||
| s.call().flatMap(state.set) | ||
| case _: PendingMessage[Request] => | ||
| sendError(Status.INTERNAL.withDescription("Half-closed without a request")) | ||
| case _ => | ||
| SyncIO.unit | ||
| } | ||
| .unsafeRunSync() | ||
|
|
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| private def sendError(status: Status): SyncIO[Unit] = | ||
| state.set(Cancelled()) >> call.close(status, new Metadata()) | ||
| } | ||
|
|
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| def unary[F[_]: Sync, Request, Response]( | ||
| impl: (Request, Metadata) => F[Response], | ||
| options: ServerOptions, | ||
| dispatcher: Dispatcher[F] | ||
| ): ServerCallHandler[Request, Response] = | ||
| new ServerCallHandler[Request, Response] { | ||
| private val opt = options.callOptionsFn(ServerCallOptions.default) | ||
|
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| def startCall(call: ServerCall[Request, Response], headers: Metadata): ServerCall.Listener[Request] = | ||
| startCallSync(call, opt)(call => req => call.unary(impl(req, headers), dispatcher)).unsafeRunSync() | ||
| } | ||
|
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| def stream[F[_]: Sync, Request, Response]( | ||
| impl: (Request, Metadata) => fs2.Stream[F, Response], | ||
| options: ServerOptions, | ||
| dispatcher: Dispatcher[F] | ||
| ): ServerCallHandler[Request, Response] = | ||
| new ServerCallHandler[Request, Response] { | ||
| private val opt = options.callOptionsFn(ServerCallOptions.default) | ||
|
|
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| def startCall(call: ServerCall[Request, Response], headers: Metadata): ServerCall.Listener[Request] = | ||
| startCallSync(call, opt)(call => req => call.stream(impl(req, headers), dispatcher)).unsafeRunSync() | ||
| } | ||
|
|
||
| private def startCallSync[F[_], Request, Response]( | ||
| call: ServerCall[Request, Response], | ||
| options: ServerCallOptions | ||
| )(f: Fs2ServerCall[Request, Response] => Request => SyncIO[Cancel]): SyncIO[ServerCall.Listener[Request]] = { | ||
| for { | ||
| call <- Fs2ServerCall.setup(options, call) | ||
| // We expect only 1 request, but we ask for 2 requests here so that if a misbehaving client | ||
| // sends more than 1 requests, ServerCall will catch it. | ||
| _ <- call.request(2) | ||
| state <- CallerState.init(f(call)) | ||
| } yield mkListener[Request, Response](call, state) | ||
| } | ||
| } |
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