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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,145 @@ | ||
| // Copyright 2022-2023 The Connect Authors | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package com.connectrpc.http | ||
|
|
||
| import kotlinx.coroutines.withContext | ||
| import okio.Buffer | ||
| import java.util.concurrent.atomic.AtomicBoolean | ||
| import kotlin.coroutines.CoroutineContext | ||
|
|
||
| /** | ||
| * Stream represents the communications for a single streaming RPC. | ||
| * It can be used to send messages and to close the stream. Receiving | ||
| * messages is done via callbacks provided when the stream is created. | ||
| * | ||
| * See HTTPClientInterface#stream. | ||
| */ | ||
| interface Stream { | ||
| suspend fun send(buffer: Buffer): Result<Unit> | ||
|
|
||
| suspend fun sendClose() | ||
|
|
||
| suspend fun receiveClose() | ||
|
|
||
| fun isSendClosed(): Boolean | ||
|
|
||
| fun isReceiveClosed(): Boolean | ||
| } | ||
|
|
||
| /** | ||
| * Creates a new stream whose implementation of sending and | ||
| * closing is delegated to the given lambdas. | ||
| */ | ||
| fun Stream( | ||
| onSend: suspend (Buffer) -> Result<Unit>, | ||
| onSendClose: suspend () -> Unit = {}, | ||
| onReceiveClose: suspend () -> Unit = {}, | ||
| ): Stream { | ||
| val isSendClosed = AtomicBoolean() | ||
| val isReceiveClosed = AtomicBoolean() | ||
| return object : Stream { | ||
| override suspend fun send(buffer: Buffer): Result<Unit> { | ||
| if (isSendClosed()) { | ||
| return Result.failure(IllegalStateException("cannot send. underlying stream is closed")) | ||
| } | ||
| return try { | ||
| onSend(buffer) | ||
| } catch (e: Throwable) { | ||
| Result.failure(e) | ||
| } | ||
| } | ||
|
|
||
| override suspend fun sendClose() { | ||
| if (isSendClosed.compareAndSet(false, true)) { | ||
| onSendClose() | ||
| } | ||
| } | ||
|
|
||
| override suspend fun receiveClose() { | ||
| if (isReceiveClosed.compareAndSet(false, true)) { | ||
| try { | ||
| onReceiveClose() | ||
| } finally { | ||
| // When receive side is closed, the send side is | ||
| // implicitly closed as well. | ||
| // We don't use sendClose() because we don't want to | ||
| // invoke onSendClose() since that will try to actually | ||
| // half-close the HTTP stream, which will fail since | ||
| // closing the receive side cancels the entire thing. | ||
| isSendClosed.set(true) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| override fun isSendClosed(): Boolean { | ||
| return isSendClosed.get() | ||
| } | ||
|
|
||
| override fun isReceiveClosed(): Boolean { | ||
| return isReceiveClosed.get() | ||
| } | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * Returns a new stream that applies the given function to each | ||
| * buffer when send is called. The result of that function is | ||
| * what is passed along to the original stream. | ||
| */ | ||
| fun Stream.transform(apply: (Buffer) -> Buffer): Stream { | ||
| val delegate = this | ||
| return object : Stream { | ||
| override suspend fun send(buffer: Buffer): Result<Unit> { | ||
| return delegate.send(apply(buffer)) | ||
| } | ||
| override suspend fun sendClose() { | ||
| delegate.sendClose() | ||
| } | ||
| override suspend fun receiveClose() { | ||
| delegate.receiveClose() | ||
| } | ||
| override fun isSendClosed(): Boolean { | ||
| return delegate.isSendClosed() | ||
| } | ||
| override fun isReceiveClosed(): Boolean { | ||
| return delegate.isReceiveClosed() | ||
| } | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * Returns a new stream that dispatches suspending operations | ||
| * (sending and closing) using the given coroutine context. | ||
| */ | ||
| fun Stream.dispatchIn(context: CoroutineContext): Stream { | ||
| val delegate = this | ||
| return object : Stream { | ||
| override suspend fun send(buffer: Buffer): Result<Unit> = withContext(context) { | ||
| delegate.send(buffer) | ||
| } | ||
| override suspend fun sendClose() = withContext(context) { | ||
| delegate.sendClose() | ||
| } | ||
| override suspend fun receiveClose() = withContext(context) { | ||
| delegate.receiveClose() | ||
| } | ||
| override fun isSendClosed(): Boolean { | ||
| return delegate.isSendClosed() | ||
| } | ||
| override fun isReceiveClosed(): Boolean { | ||
| return delegate.isReceiveClosed() | ||
| } | ||
| } | ||
| } |
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