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CurlMultiApiHandler.kt
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CurlMultiApiHandler.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.curl.internal
import io.ktor.client.engine.curl.*
import io.ktor.client.plugins.*
import io.ktor.utils.io.core.*
import kotlinx.atomicfu.locks.*
import kotlinx.cinterop.*
import kotlinx.coroutines.*
import libcurl.*
private class RequestHolder(
val responseCompletable: CompletableDeferred<CurlSuccess>,
val requestWrapper: StableRef<CurlRequestBodyData>,
val responseWrapper: StableRef<CurlResponseBodyData>,
) {
fun dispose() {
requestWrapper.dispose()
responseWrapper.dispose()
}
}
internal class CurlMultiApiHandler : Closeable {
private val activeHandles = mutableMapOf<EasyHandle, RequestHolder>()
private val cancelledHandles = mutableSetOf<Pair<EasyHandle, Throwable>>()
private val multiHandle: MultiHandle = curl_multi_init()
?: @Suppress("DEPRECATION") throw CurlRuntimeException("Could not initialize curl multi handle")
private val easyHandlesToUnpauseLock = SynchronizedObject()
private val easyHandlesToUnpause = mutableListOf<EasyHandle>()
override fun close() {
for ((handle, holder) in activeHandles) {
curl_multi_remove_handle(multiHandle, handle).verify()
curl_easy_cleanup(handle)
holder.dispose()
}
activeHandles.clear()
curl_multi_cleanup(multiHandle).verify()
}
fun scheduleRequest(request: CurlRequestData, deferred: CompletableDeferred<CurlSuccess>): EasyHandle {
val easyHandle = curl_easy_init()
?: throw @Suppress("DEPRECATION") CurlIllegalStateException("Could not initialize an easy handle")
val bodyStartedReceiving = CompletableDeferred<Unit>()
val responseData = CurlResponseBuilder(request)
val responseDataRef = responseData.asStablePointer()
val responseWrapper = CurlResponseBodyData(
body = responseData.bodyChannel,
callContext = request.executionContext,
bodyStartedReceiving = bodyStartedReceiving,
onUnpause = {
synchronized(easyHandlesToUnpauseLock) {
easyHandlesToUnpause.add(easyHandle)
}
curl_multi_wakeup(multiHandle)
}
).asStablePointer()
bodyStartedReceiving.invokeOnCompletion {
val result = collectSuccessResponse(easyHandle) ?: return@invokeOnCompletion
activeHandles[easyHandle]!!.responseCompletable.complete(result)
}
setupMethod(easyHandle, request.method, request.contentLength)
val requestWrapper = setupUploadContent(easyHandle, request)
val requestHolder = RequestHolder(
deferred,
requestWrapper.asStableRef(),
responseWrapper.asStableRef()
)
activeHandles[easyHandle] = requestHolder
easyHandle.apply {
option(CURLOPT_URL, request.url)
option(CURLOPT_HTTPHEADER, request.headers)
option(CURLOPT_HEADERFUNCTION, staticCFunction(::onHeadersReceived))
option(CURLOPT_HEADERDATA, responseDataRef)
option(CURLOPT_WRITEFUNCTION, staticCFunction(::onBodyChunkReceived))
option(CURLOPT_WRITEDATA, responseWrapper)
option(CURLOPT_PRIVATE, responseDataRef)
option(CURLOPT_ACCEPT_ENCODING, "")
request.connectTimeout?.let {
if (it != HttpTimeout.INFINITE_TIMEOUT_MS) {
option(CURLOPT_CONNECTTIMEOUT_MS, request.connectTimeout)
} else {
option(CURLOPT_CONNECTTIMEOUT_MS, Long.MAX_VALUE)
}
}
request.proxy?.let { proxy ->
option(CURLOPT_PROXY, proxy.toString())
option(CURLOPT_SUPPRESS_CONNECT_HEADERS, 1L)
if (request.forceProxyTunneling) {
option(CURLOPT_HTTPPROXYTUNNEL, 1L)
}
}
if (!request.sslVerify) {
option(CURLOPT_SSL_VERIFYPEER, 0L)
option(CURLOPT_SSL_VERIFYHOST, 0L)
}
}
curl_multi_add_handle(multiHandle, easyHandle).verify()
return easyHandle
}
internal fun cancelRequest(easyHandle: EasyHandle, cause: Throwable) {
cancelledHandles += Pair(easyHandle, cause)
curl_multi_remove_handle(multiHandle, easyHandle).verify()
}
internal fun perform() {
if (activeHandles.isEmpty()) return
memScoped {
val transfersRunning = alloc<IntVar>()
do {
synchronized(easyHandlesToUnpauseLock) {
var handle = easyHandlesToUnpause.removeFirstOrNull()
while (handle != null) {
curl_easy_pause(handle, CURLPAUSE_CONT)
handle = easyHandlesToUnpause.removeFirstOrNull()
}
}
curl_multi_perform(multiHandle, transfersRunning.ptr).verify()
if (transfersRunning.value != 0) {
curl_multi_poll(multiHandle, null, 0.toUInt(), 10000, null).verify()
}
if (transfersRunning.value < activeHandles.size) {
handleCompleted()
}
} while (transfersRunning.value != 0)
}
}
internal fun hasHandlers(): Boolean = activeHandles.isNotEmpty()
private fun setupMethod(
easyHandle: EasyHandle,
method: String,
size: Long
) {
easyHandle.apply {
when (method) {
"GET" -> option(CURLOPT_HTTPGET, 1L)
"PUT" -> option(CURLOPT_PUT, 1L)
"POST" -> {
option(CURLOPT_POST, 1L)
option(CURLOPT_POSTFIELDSIZE, size)
}
"HEAD" -> option(CURLOPT_NOBODY, 1L)
else -> {
if (size > 0) option(CURLOPT_POST, 1L)
option(CURLOPT_CUSTOMREQUEST, method)
}
}
}
}
private fun setupUploadContent(easyHandle: EasyHandle, request: CurlRequestData): COpaquePointer {
val requestPointer = CurlRequestBodyData(
body = request.content,
callContext = request.executionContext,
onUnpause = {
synchronized(easyHandlesToUnpauseLock) {
easyHandlesToUnpause.add(easyHandle)
}
curl_multi_wakeup(multiHandle)
}
).asStablePointer()
easyHandle.apply {
option(CURLOPT_READDATA, requestPointer)
option(CURLOPT_READFUNCTION, staticCFunction(::onBodyChunkRequested))
option(CURLOPT_INFILESIZE_LARGE, request.contentLength)
}
return requestPointer
}
private fun handleCompleted() {
for (cancellation in cancelledHandles) {
val cancelled = processCancelledEasyHandle(cancellation.first, cancellation.second)
val handler = activeHandles.remove(cancellation.first)!!
handler.responseCompletable.completeExceptionally(cancelled.cause)
handler.dispose()
}
cancelledHandles.clear()
memScoped {
do {
val messagesLeft = alloc<IntVar>()
val messagePtr = curl_multi_info_read(multiHandle, messagesLeft.ptr)
val message = messagePtr?.pointed ?: continue
val easyHandle = message.easy_handle
?: @Suppress("DEPRECATION")
throw CurlIllegalStateException("Got a null easy handle from the message")
try {
val result = processCompletedEasyHandle(message.msg, easyHandle, message.data.result)
val deferred = activeHandles[easyHandle]!!.responseCompletable
if (deferred.isCompleted) {
// already completed with partial response
continue
}
when (result) {
is CurlSuccess -> deferred.complete(result)
is CurlFail -> deferred.completeExceptionally(result.cause)
}
} finally {
activeHandles.remove(easyHandle)!!.dispose()
}
} while (messagesLeft.value != 0)
}
}
private fun processCancelledEasyHandle(easyHandle: EasyHandle, cause: Throwable): CurlFail = memScoped {
try {
val responseDataRef = alloc<COpaquePointerVar>()
easyHandle.apply { getInfo(CURLINFO_PRIVATE, responseDataRef.ptr) }
val responseBuilder = responseDataRef.value!!.fromCPointer<CurlResponseBuilder>()
try {
return CurlFail(cause)
} finally {
responseBuilder.bodyChannel.close(cause)
responseBuilder.headersBytes.release()
}
} finally {
curl_multi_remove_handle(multiHandle, easyHandle).verify()
curl_easy_cleanup(easyHandle)
}
}
private fun processCompletedEasyHandle(
message: CURLMSG?,
easyHandle: EasyHandle,
result: CURLcode
): CurlResponseData = memScoped {
try {
val responseDataRef = alloc<COpaquePointerVar>()
val httpStatusCode = alloc<LongVar>()
easyHandle.apply {
getInfo(CURLINFO_RESPONSE_CODE, httpStatusCode.ptr)
getInfo(CURLINFO_PRIVATE, responseDataRef.ptr)
}
val responseBuilder = responseDataRef.value!!.fromCPointer<CurlResponseBuilder>()
try {
collectFailedResponse(message, responseBuilder.request, result, httpStatusCode.value)
?: collectSuccessResponse(easyHandle)!!
} finally {
responseBuilder.bodyChannel.close(null)
responseBuilder.headersBytes.release()
}
} finally {
curl_multi_remove_handle(multiHandle, easyHandle).verify()
curl_easy_cleanup(easyHandle)
}
}
private fun collectFailedResponse(
message: CURLMSG?,
request: CurlRequestData,
result: CURLcode,
httpStatusCode: Long
): CurlFail? {
curl_slist_free_all(request.headers)
if (message != CURLMSG.CURLMSG_DONE) {
return CurlFail(
@Suppress("DEPRECATION")
CurlIllegalStateException("Request $request failed: $message")
)
}
if (httpStatusCode != 0L) {
return null
}
if (result == CURLE_OPERATION_TIMEDOUT) {
return CurlFail(ConnectTimeoutException(request.url, request.connectTimeout))
}
val errorMessage = curl_easy_strerror(result)?.toKStringFromUtf8()
if (result == CURLE_PEER_FAILED_VERIFICATION) {
return CurlFail(
@Suppress("DEPRECATION")
CurlIllegalStateException(
"TLS verification failed for request: $request. Reason: $errorMessage"
)
)
}
return CurlFail(
@Suppress("DEPRECATION")
CurlIllegalStateException("Connection failed for request: $request. Reason: $errorMessage")
)
}
private fun collectSuccessResponse(easyHandle: EasyHandle): CurlSuccess? = memScoped {
val responseDataRef = alloc<COpaquePointerVar>()
val httpProtocolVersion = alloc<LongVar>()
val httpStatusCode = alloc<LongVar>()
easyHandle.apply {
getInfo(CURLINFO_RESPONSE_CODE, httpStatusCode.ptr)
getInfo(CURLINFO_PRIVATE, responseDataRef.ptr)
}
if (httpStatusCode.value == 0L) {
// if error happened, it will be handled in collectCompleted
return@memScoped null
}
val responseBuilder = responseDataRef.value!!.fromCPointer<CurlResponseBuilder>()
with(responseBuilder) {
val headers = headersBytes.build().readBytes()
CurlSuccess(
httpStatusCode.value.toInt(),
httpProtocolVersion.value.toUInt(),
headers,
bodyChannel
)
}
}
fun wakeup() {
curl_multi_wakeup(multiHandle)
}
}