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Endpoint.kt
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Endpoint.kt
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/*
* Copyright 2014-2021 JetBrains s.r.o and contributors. Use of this source code is governed by the Apache 2.0 license.
*/
package io.ktor.client.engine.cio
import io.ktor.client.engine.*
import io.ktor.client.network.sockets.*
import io.ktor.client.plugins.*
import io.ktor.client.request.*
import io.ktor.client.utils.*
import io.ktor.http.*
import io.ktor.network.sockets.*
import io.ktor.network.tls.*
import io.ktor.util.*
import io.ktor.util.date.*
import io.ktor.utils.io.core.*
import kotlinx.atomicfu.*
import kotlinx.coroutines.*
import kotlinx.coroutines.channels.*
import kotlin.coroutines.*
internal class Endpoint(
private val host: String,
private val port: Int,
private val proxy: ProxyConfig?,
private val secure: Boolean,
private val config: CIOEngineConfig,
private val connectionFactory: ConnectionFactory,
override val coroutineContext: CoroutineContext,
private val onDone: () -> Unit
) : CoroutineScope, Closeable {
private val lastActivity = atomic(GMTDate())
private val connections: AtomicInt = atomic(0)
private val deliveryPoint: Channel<RequestTask> = Channel()
private val maxEndpointIdleTime: Long = 2 * config.endpoint.connectTimeout
private val timeout = launch(coroutineContext + CoroutineName("Endpoint timeout($host:$port)")) {
try {
while (true) {
val remaining = (lastActivity.value + maxEndpointIdleTime).timestamp - GMTDate().timestamp
if (remaining <= 0) {
break
}
delay(remaining)
}
} catch (_: Throwable) {
} finally {
deliveryPoint.close()
onDone()
}
}
suspend fun execute(
request: HttpRequestData,
callContext: CoroutineContext
): HttpResponseData {
lastActivity.value = GMTDate()
if (!config.pipelining || request.requiresDedicatedConnection()) {
return makeDedicatedRequest(request, callContext)
}
val response = CompletableDeferred<HttpResponseData>()
val task = RequestTask(request, response, callContext)
try {
makePipelineRequest(task)
return response.await()
} catch (cause: Throwable) {
task.response.completeExceptionally(cause)
throw cause
}
}
private suspend fun makePipelineRequest(task: RequestTask) {
if (deliveryPoint.trySend(task).isSuccess) return
val connections = connections.value
if (connections < config.endpoint.maxConnectionsPerRoute) {
try {
createPipeline(task.request)
} catch (cause: Throwable) {
task.response.completeExceptionally(cause)
throw cause
}
}
deliveryPoint.send(task)
}
@OptIn(InternalAPI::class)
private suspend fun makeDedicatedRequest(
request: HttpRequestData,
callContext: CoroutineContext
): HttpResponseData {
try {
val connection = connect(request)
val input = this@Endpoint.mapEngineExceptions(connection.input, request)
val originOutput = this@Endpoint.mapEngineExceptions(connection.output, request)
val output = originOutput.handleHalfClosed(
callContext,
config.endpoint.allowHalfClose
)
callContext[Job]!!.invokeOnCompletion { cause ->
val originCause = cause?.unwrapCancellationException()
try {
input.cancel(originCause)
originOutput.close(originCause)
connection.socket.close()
releaseConnection()
} catch (_: Throwable) {
}
}
val timeout = getRequestTimeout(request, config)
setupTimeout(callContext, request, timeout)
val requestTime = GMTDate()
writeRequest(request, output, callContext, proxy != null)
return readResponse(requestTime, request, input, originOutput, callContext)
} catch (cause: Throwable) {
throw cause.mapToKtor(request)
}
}
private suspend fun createPipeline(request: HttpRequestData) {
val connection = connect(request)
val pipeline = ConnectionPipeline(
config.endpoint.keepAliveTime,
config.endpoint.pipelineMaxSize,
connection,
proxy != null,
deliveryPoint,
coroutineContext
)
pipeline.pipelineContext.invokeOnCompletion { releaseConnection() }
}
private suspend fun connect(requestData: HttpRequestData): Connection {
val connectAttempts = config.endpoint.connectAttempts
val (connectTimeout, socketTimeout) = retrieveTimeouts(requestData)
var timeoutFails = 0
connections.incrementAndGet()
try {
repeat(connectAttempts) {
val address = InetSocketAddress(host, port)
val connect: suspend CoroutineScope.() -> Socket = {
connectionFactory.connect(address) {
this.socketTimeout = socketTimeout
}
}
val socket = when (connectTimeout) {
HttpTimeout.INFINITE_TIMEOUT_MS -> connect()
else -> {
val connection = withTimeoutOrNull(connectTimeout, connect)
if (connection == null) {
timeoutFails++
return@repeat
}
connection
}
}
val connection = socket.connection()
if (!secure) return@connect connection
try {
if (proxy?.type == ProxyType.HTTP) {
startTunnel(requestData, connection.output, connection.input)
}
val tlsSocket = connection.tls(coroutineContext) {
takeFrom(config.https)
serverName = serverName ?: address.hostname
}
return tlsSocket.connection()
} catch (cause: Throwable) {
try {
socket.close()
} catch (_: Throwable) {
}
connectionFactory.release(address)
throw cause
}
}
} catch (cause: Throwable) {
connections.decrementAndGet()
throw cause
}
connections.decrementAndGet()
throw getTimeoutException(connectAttempts, timeoutFails, requestData)
}
/**
* Defines the exact type of exception based on [connectAttempts] and [timeoutFails].
*/
private fun getTimeoutException(
connectAttempts: Int,
timeoutFails: Int,
request: HttpRequestData
): Exception = when (timeoutFails) {
connectAttempts -> ConnectTimeoutException(request)
else -> FailToConnectException()
}
/**
* Takes timeout attributes from [config] and [HttpTimeout.HttpTimeoutCapabilityConfiguration] and returns a pair of
* connection timeout and socket timeout to be applied.
*/
private fun retrieveTimeouts(requestData: HttpRequestData): Pair<Long, Long> {
val default = config.endpoint.connectTimeout to config.endpoint.socketTimeout
val timeoutAttributes = requestData.getCapabilityOrNull(HttpTimeout)
?: return default
val socketTimeout = timeoutAttributes.socketTimeoutMillis ?: config.endpoint.socketTimeout
val connectTimeout = timeoutAttributes.connectTimeoutMillis ?: config.endpoint.connectTimeout
return connectTimeout to socketTimeout
}
private fun releaseConnection() {
val address = InetSocketAddress(host, port)
connectionFactory.release(address)
connections.decrementAndGet()
}
override fun close() {
timeout.cancel()
}
}
@OptIn(DelicateCoroutinesApi::class)
private fun setupTimeout(callContext: CoroutineContext, request: HttpRequestData, timeout: Long) {
if (timeout == HttpTimeout.INFINITE_TIMEOUT_MS || timeout == 0L) return
val timeoutJob = GlobalScope.launch {
delay(timeout)
callContext.job.cancel("Request is timed out", HttpRequestTimeoutException(request))
}
callContext.job.invokeOnCompletion {
timeoutJob.cancel()
}
}
@Suppress("KDocMissingDocumentation")
public class FailToConnectException : Exception("Connect timed out or retry attempts exceeded")
internal expect fun Throwable.mapToKtor(request: HttpRequestData): Throwable
@OptIn(InternalAPI::class)
internal fun getRequestTimeout(
request: HttpRequestData,
engineConfig: CIOEngineConfig
): Long {
/**
* The request timeout is handled by the plugin and disabled for the WebSockets.
*/
val isWebSocket = request.url.protocol.isWebsocket()
if (request.getCapabilityOrNull(HttpTimeout) != null || isWebSocket || request.isUpgradeRequest()) {
return HttpTimeout.INFINITE_TIMEOUT_MS
}
return engineConfig.requestTimeout
}