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Merge pull request #506 from naoh87/add_unary_client
add lightweight toUnary client runtime
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runtime/src/main/scala/fs2/grpc/client/internal/Fs2UnaryCallHandler.scala
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,160 @@ | ||
| /* | ||
| * 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. | ||
| */ | ||
|
|
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| package fs2.grpc.client.internal | ||
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| import cats.effect.Sync | ||
| import cats.effect.SyncIO | ||
| import cats.effect.syntax.all._ | ||
| import cats.effect.kernel.Async | ||
| import cats.effect.kernel.Outcome | ||
| import cats.effect.kernel.Ref | ||
| import cats.syntax.functor._ | ||
| import cats.syntax.flatMap._ | ||
| import fs2._ | ||
| import fs2.grpc.client.ClientOptions | ||
| import io.grpc._ | ||
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| private[client] object Fs2UnaryCallHandler { | ||
| sealed trait ReceiveState[R] | ||
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| object ReceiveState { | ||
| def init[F[_]: Sync, R]( | ||
| callback: Either[Throwable, R] => Unit, | ||
| pf: PartialFunction[StatusRuntimeException, Exception] | ||
| ): F[Ref[SyncIO, ReceiveState[R]]] = | ||
| Ref.in(new PendingMessage[R]({ | ||
| case r: Right[Throwable, R] => callback(r) | ||
| case Left(e: StatusRuntimeException) => callback(Left(pf.lift(e).getOrElse(e))) | ||
| case l: Left[Throwable, R] => callback(l) | ||
| })) | ||
| } | ||
|
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| class PendingMessage[R](callback: Either[Throwable, R] => Unit) extends ReceiveState[R] { | ||
| def receive(message: R): PendingHalfClose[R] = new PendingHalfClose(callback, message) | ||
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| def sendError(error: Throwable): SyncIO[ReceiveState[R]] = | ||
| SyncIO(callback(Left(error))).as(new Done[R]) | ||
| } | ||
|
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| class PendingHalfClose[R](callback: Either[Throwable, R] => Unit, message: R) extends ReceiveState[R] { | ||
| def sendError(error: Throwable): SyncIO[ReceiveState[R]] = | ||
| SyncIO(callback(Left(error))).as(new Done[R]) | ||
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| def done: SyncIO[ReceiveState[R]] = SyncIO(callback(Right(message))).as(new Done[R]) | ||
| } | ||
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| class Done[R] extends ReceiveState[R] | ||
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| private def mkListener[Response]( | ||
| state: Ref[SyncIO, ReceiveState[Response]] | ||
| ): ClientCall.Listener[Response] = | ||
| new ClientCall.Listener[Response] { | ||
| override def onMessage(message: Response): Unit = | ||
| state.get | ||
| .flatMap { | ||
| case expected: PendingMessage[Response] => | ||
| state.set(expected.receive(message)) | ||
| case current: PendingHalfClose[Response] => | ||
| current | ||
| .sendError( | ||
| Status.INTERNAL | ||
| .withDescription("More than one value received for unary call") | ||
| .asRuntimeException() | ||
| ) | ||
| .flatMap(state.set) | ||
| case _ => SyncIO.unit | ||
| } | ||
| .unsafeRunSync() | ||
|
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| override def onClose(status: Status, trailers: Metadata): Unit = { | ||
| if (status.isOk) { | ||
| state.get.flatMap { | ||
| case expected: PendingHalfClose[Response] => | ||
| expected.done.flatMap(state.set) | ||
| case current: PendingMessage[Response] => | ||
| current | ||
| .sendError( | ||
| Status.INTERNAL | ||
| .withDescription("No value received for unary call") | ||
| .asRuntimeException(trailers) | ||
| ) | ||
| .flatMap(state.set) | ||
| case _ => SyncIO.unit | ||
| } | ||
| } else { | ||
| state.get.flatMap { | ||
| case current: PendingHalfClose[Response] => | ||
| current.sendError(status.asRuntimeException(trailers)).flatMap(state.set) | ||
| case current: PendingMessage[Response] => | ||
| current.sendError(status.asRuntimeException(trailers)).flatMap(state.set) | ||
| case _ => SyncIO.unit | ||
| } | ||
| } | ||
| }.unsafeRunSync() | ||
| } | ||
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| def unary[F[_], Request, Response]( | ||
| call: ClientCall[Request, Response], | ||
| options: ClientOptions, | ||
| message: Request, | ||
| headers: Metadata | ||
| )(implicit F: Async[F]): F[Response] = F.async[Response] { cb => | ||
| ReceiveState.init(cb, options.errorAdapter).map { state => | ||
| call.start(mkListener[Response](state), headers) | ||
| // Initially ask for two responses from flow-control so that if a misbehaving server | ||
| // sends more than one responses, we can catch it and fail it in the listener. | ||
| call.request(2) | ||
| call.sendMessage(message) | ||
| call.halfClose() | ||
| Some(onCancel(call)) | ||
| } | ||
| } | ||
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| def stream[F[_], Request, Response]( | ||
| call: ClientCall[Request, Response], | ||
| options: ClientOptions, | ||
| messages: Stream[F, Request], | ||
| headers: Metadata | ||
| )(implicit F: Async[F]): F[Response] = F.async[Response] { cb => | ||
| ReceiveState.init(cb, options.errorAdapter).flatMap { state => | ||
| call.start(mkListener[Response](state), headers) | ||
| // Initially ask for two responses from flow-control so that if a misbehaving server | ||
| // sends more than one responses, we can catch it and fail it in the listener. | ||
| call.request(2) | ||
| messages | ||
| .map(call.sendMessage) | ||
| .compile | ||
| .drain | ||
| .guaranteeCase { | ||
| case Outcome.Succeeded(_) => F.delay(call.halfClose()) | ||
| case Outcome.Errored(e) => F.delay(call.cancel(e.getMessage, e)) | ||
| case Outcome.Canceled() => onCancel(call) | ||
| } | ||
| .start | ||
| .map(sending => Some(sending.cancel >> onCancel(call))) | ||
| } | ||
| } | ||
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| private def onCancel[F[_]](call: ClientCall[_, _])(implicit F: Async[F]): F[Unit] = | ||
| F.delay(call.cancel("call was cancelled", null)) | ||
|
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| } |
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