Source/modules/websockets/WorkerWebSocketChannel.cpp - chromium/blink - Git at Google

 /*
  * Copyright (C) 2011, 2012 Google Inc.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
  * copyright notice, this list of conditions and the following disclaimer
  * in the documentation and/or other materials provided with the
  * distribution.
  *     * Neither the name of Google Inc. nor the names of its
  * contributors may be used to endorse or promote products derived from
  * this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */

 #include "config.h"
 #include "modules/websockets/WorkerWebSocketChannel.h"

 #include "bindings/core/v8/ScriptCallStackFactory.h"
 #include "core/dom/CrossThreadTask.h"
 #include "core/dom/DOMArrayBuffer.h"
 #include "core/dom/Document.h"
 #include "core/dom/ExecutionContext.h"
 #include "core/dom/ExecutionContextTask.h"
 #include "core/fileapi/Blob.h"
 #include "core/inspector/ScriptCallFrame.h"
 #include "core/inspector/ScriptCallStack.h"
 #include "core/workers/WorkerGlobalScope.h"
 #include "core/workers/WorkerLoaderProxy.h"
 #include "core/workers/WorkerThread.h"
 #include "modules/websockets/DocumentWebSocketChannel.h"
 #include "platform/heap/SafePoint.h"
 #include "public/platform/Platform.h"
 #include "public/platform/WebWaitableEvent.h"
 #include "wtf/Assertions.h"
 #include "wtf/Functional.h"
 #include "wtf/MainThread.h"
 #include "wtf/text/CString.h"
 #include "wtf/text/WTFString.h"

 namespace blink {

 typedef WorkerWebSocketChannel::Bridge Bridge;
 typedef WorkerWebSocketChannel::Peer Peer;

 // Created and destroyed on the worker thread. All setters of this class are
 // called on the main thread, while all getters are called on the worker
 // thread. signalWorkerThread() must be called before any getters are called.
 class WebSocketChannelSyncHelper : public GarbageCollectedFinalized<WebSocketChannelSyncHelper> {
 public:
     static WebSocketChannelSyncHelper* create(PassOwnPtr<WebWaitableEvent> event)
     {
         return new WebSocketChannelSyncHelper(event);
     }

     ~WebSocketChannelSyncHelper()
     {
     }

     // All setters are called on the main thread.
     void setConnectRequestResult(bool connectRequestResult)
     {
         m_connectRequestResult = connectRequestResult;
     }

     // All getter are called on the worker thread.
     bool connectRequestResult() const
     {
         return m_connectRequestResult;
     }

     // This should be called after all setters are called and before any
     // getters are called.
     void signalWorkerThread()
     {
         m_event->signal();
     }
     void wait()
     {
         m_event->wait();
     }

     DEFINE_INLINE_TRACE() { }

 private:
     explicit WebSocketChannelSyncHelper(PassOwnPtr<WebWaitableEvent> event)
         : m_event(event)
         , m_connectRequestResult(false)
     {
     }

     OwnPtr<WebWaitableEvent> m_event;
     bool m_connectRequestResult;
 };

 WorkerWebSocketChannel::WorkerWebSocketChannel(WorkerGlobalScope& workerGlobalScope, WebSocketChannelClient* client, const String& sourceURL, unsigned lineNumber)
     : m_bridge(new Bridge(client, workerGlobalScope))
     , m_sourceURLAtConnection(sourceURL)
     , m_lineNumberAtConnection(lineNumber)
 {
     m_bridge->initialize(sourceURL, lineNumber);
 }

 WorkerWebSocketChannel::~WorkerWebSocketChannel()
 {
     ASSERT(!m_bridge);
 }

 bool WorkerWebSocketChannel::connect(const KURL& url, const String& protocol)
 {
     ASSERT(m_bridge);
     return m_bridge->connect(url, protocol);
 }

 void WorkerWebSocketChannel::send(const CString& message)
 {
     ASSERT(m_bridge);
     m_bridge->send(message);
 }

 void WorkerWebSocketChannel::send(const DOMArrayBuffer& binaryData, unsigned byteOffset, unsigned byteLength)
 {
     ASSERT(m_bridge);
     m_bridge->send(binaryData, byteOffset, byteLength);
 }

 void WorkerWebSocketChannel::send(PassRefPtr<BlobDataHandle> blobData)
 {
     ASSERT(m_bridge);
     m_bridge->send(blobData);
 }

 void WorkerWebSocketChannel::close(int code, const String& reason)
 {
     ASSERT(m_bridge);
     m_bridge->close(code, reason);
 }

 void WorkerWebSocketChannel::fail(const String& reason, MessageLevel level, const String& sourceURL, unsigned lineNumber)
 {
     if (!m_bridge)
         return;

     RefPtrWillBeRawPtr<ScriptCallStack> callStack = currentScriptCallStack(1);
     if (callStack && callStack->size())  {
         // In order to emulate the ConsoleMessage behavior,
         // we should ignore the specified url and line number if
         // we can get the JavaScript context.
         m_bridge->fail(reason, level, callStack->at(0).sourceURL(), callStack->at(0).lineNumber());
     } else if (sourceURL.isEmpty() && !lineNumber) {
         // No information is specified by the caller - use the url
         // and the line number at the connection.
         m_bridge->fail(reason, level, m_sourceURLAtConnection, m_lineNumberAtConnection);
     } else {
         // Use the specified information.
         m_bridge->fail(reason, level, sourceURL, lineNumber);
     }
 }

 void WorkerWebSocketChannel::disconnect()
 {
     m_bridge->disconnect();
     m_bridge.clear();
 }

 DEFINE_TRACE(WorkerWebSocketChannel)
 {
     visitor->trace(m_bridge);
     WebSocketChannel::trace(visitor);
 }

 Peer::Peer(Bridge* bridge, PassRefPtr<WorkerLoaderProxy> loaderProxy, WebSocketChannelSyncHelper* syncHelper)
     : m_bridge(bridge)
     , m_loaderProxy(loaderProxy)
     , m_mainWebSocketChannel(nullptr)
     , m_syncHelper(syncHelper)
 {
     ASSERT(!isMainThread());
 }

 Peer::~Peer()
 {
     ASSERT(!isMainThread());
 }

 void Peer::initialize(const String& sourceURL, unsigned lineNumber, ExecutionContext* context)
 {
     ASSERT(isMainThread());
     Document* document = toDocument(context);
     m_mainWebSocketChannel = DocumentWebSocketChannel::create(document, this, sourceURL, lineNumber);
     m_syncHelper->signalWorkerThread();
 }

 void Peer::connect(const KURL& url, const String& protocol)
 {
     ASSERT(isMainThread());
     ASSERT(m_syncHelper);
     if (!m_mainWebSocketChannel) {
         m_syncHelper->setConnectRequestResult(false);
     } else {
         bool connectRequestResult = m_mainWebSocketChannel->connect(url, protocol);
         m_syncHelper->setConnectRequestResult(connectRequestResult);
     }
     m_syncHelper->signalWorkerThread();
 }

 void Peer::sendTextAsCharVector(PassOwnPtr<Vector<char>> data)
 {
     ASSERT(isMainThread());
     if (m_mainWebSocketChannel)
         m_mainWebSocketChannel->sendTextAsCharVector(data);
 }

 void Peer::sendBinaryAsCharVector(PassOwnPtr<Vector<char>> data)
 {
     ASSERT(isMainThread());
     if (m_mainWebSocketChannel)
         m_mainWebSocketChannel->sendBinaryAsCharVector(data);
 }

 void Peer::sendBlob(PassRefPtr<BlobDataHandle> blobData)
 {
     ASSERT(isMainThread());
     if (m_mainWebSocketChannel)
         m_mainWebSocketChannel->send(blobData);
 }

 void Peer::close(int code, const String& reason)
 {
     ASSERT(isMainThread());
     ASSERT(m_syncHelper);
     if (!m_mainWebSocketChannel)
         return;
     m_mainWebSocketChannel->close(code, reason);
 }

 void Peer::fail(const String& reason, MessageLevel level, const String& sourceURL, unsigned lineNumber)
 {
     ASSERT(isMainThread());
     ASSERT(m_syncHelper);
     if (!m_mainWebSocketChannel)
         return;
     m_mainWebSocketChannel->fail(reason, level, sourceURL, lineNumber);
 }

 void Peer::disconnect()
 {
     ASSERT(isMainThread());
     ASSERT(m_syncHelper);
     if (m_mainWebSocketChannel) {
         m_mainWebSocketChannel->disconnect();
         m_mainWebSocketChannel = nullptr;
     }
     m_syncHelper->signalWorkerThread();
 }

 static void workerGlobalScopeDidConnect(Bridge* bridge, const String& subprotocol, const String& extensions, ExecutionContext* context)
 {
     ASSERT_UNUSED(context, context->isWorkerGlobalScope());
     if (bridge->client())
         bridge->client()->didConnect(subprotocol, extensions);
 }

 void Peer::didConnect(const String& subprotocol, const String& extensions)
 {
     ASSERT(isMainThread());
     m_loaderProxy->postTaskToWorkerGlobalScope(createCrossThreadTask(&workerGlobalScopeDidConnect, m_bridge, subprotocol, extensions));
 }

 static void workerGlobalScopeDidReceiveTextMessage(Bridge* bridge, const String& payload, ExecutionContext* context)
 {
     ASSERT_UNUSED(context, context->isWorkerGlobalScope());
     if (bridge->client())
         bridge->client()->didReceiveTextMessage(payload);
 }

 void Peer::didReceiveTextMessage(const String& payload)
 {
     ASSERT(isMainThread());
     m_loaderProxy->postTaskToWorkerGlobalScope(createCrossThreadTask(&workerGlobalScopeDidReceiveTextMessage, m_bridge, payload));
 }

 static void workerGlobalScopeDidReceiveBinaryMessage(Bridge* bridge, PassOwnPtr<Vector<char>> payload, ExecutionContext* context)
 {
     ASSERT_UNUSED(context, context->isWorkerGlobalScope());
     if (bridge->client())
         bridge->client()->didReceiveBinaryMessage(payload);
 }

 void Peer::didReceiveBinaryMessage(PassOwnPtr<Vector<char>> payload)
 {
     ASSERT(isMainThread());
     m_loaderProxy->postTaskToWorkerGlobalScope(createCrossThreadTask(&workerGlobalScopeDidReceiveBinaryMessage, m_bridge, payload));
 }

 static void workerGlobalScopeDidConsumeBufferedAmount(Bridge* bridge, uint64_t consumed, ExecutionContext* context)
 {
     ASSERT_UNUSED(context, context->isWorkerGlobalScope());
     if (bridge->client())
         bridge->client()->didConsumeBufferedAmount(consumed);
 }

 void Peer::didConsumeBufferedAmount(uint64_t consumed)
 {
     ASSERT(isMainThread());
     m_loaderProxy->postTaskToWorkerGlobalScope(createCrossThreadTask(&workerGlobalScopeDidConsumeBufferedAmount, m_bridge, consumed));
 }

 static void workerGlobalScopeDidStartClosingHandshake(Bridge* bridge, ExecutionContext* context)
 {
     ASSERT_UNUSED(context, context->isWorkerGlobalScope());
     if (bridge->client())
         bridge->client()->didStartClosingHandshake();
 }

 void Peer::didStartClosingHandshake()
 {
     ASSERT(isMainThread());
     m_loaderProxy->postTaskToWorkerGlobalScope(createCrossThreadTask(&workerGlobalScopeDidStartClosingHandshake, m_bridge));
 }

 static void workerGlobalScopeDidClose(Bridge* bridge, WebSocketChannelClient::ClosingHandshakeCompletionStatus closingHandshakeCompletion, unsigned short code, const String& reason, ExecutionContext* context)
 {
     ASSERT_UNUSED(context, context->isWorkerGlobalScope());
     if (bridge->client())
         bridge->client()->didClose(closingHandshakeCompletion, code, reason);
 }

 void Peer::didClose(ClosingHandshakeCompletionStatus closingHandshakeCompletion, unsigned short code, const String& reason)
 {
     ASSERT(isMainThread());
     if (m_mainWebSocketChannel) {
         m_mainWebSocketChannel->disconnect();
         m_mainWebSocketChannel = nullptr;
     }
     m_loaderProxy->postTaskToWorkerGlobalScope(createCrossThreadTask(&workerGlobalScopeDidClose, m_bridge, closingHandshakeCompletion, code, reason));
 }

 static void workerGlobalScopeDidError(Bridge* bridge, ExecutionContext* context)
 {
     ASSERT_UNUSED(context, context->isWorkerGlobalScope());
     if (bridge->client())
         bridge->client()->didError();
 }

 void Peer::didError()
 {
     ASSERT(isMainThread());
     m_loaderProxy->postTaskToWorkerGlobalScope(createCrossThreadTask(&workerGlobalScopeDidError, m_bridge));
 }

 DEFINE_TRACE(Peer)
 {
     visitor->trace(m_bridge);
     visitor->trace(m_mainWebSocketChannel);
     visitor->trace(m_syncHelper);
     WebSocketChannelClient::trace(visitor);
 }

 Bridge::Bridge(WebSocketChannelClient* client, WorkerGlobalScope& workerGlobalScope)
     : m_client(client)
     , m_workerGlobalScope(workerGlobalScope)
     , m_loaderProxy(m_workerGlobalScope->thread()->workerLoaderProxy())
     , m_syncHelper(WebSocketChannelSyncHelper::create(adoptPtr(Platform::current()->createWaitableEvent())))
     , m_peer(new Peer(this, m_loaderProxy, m_syncHelper))
 {
 }

 Bridge::~Bridge()
 {
     ASSERT(!m_peer);
 }

 void Bridge::initialize(const String& sourceURL, unsigned lineNumber)
 {
     if (!waitForMethodCompletion(createCrossThreadTask(&Peer::initialize, m_peer.get(), sourceURL, lineNumber))) {
         // The worker thread has been signalled to shutdown before method completion.
         disconnect();
     }
 }

 bool Bridge::connect(const KURL& url, const String& protocol)
 {
     if (!m_peer)
         return false;

     if (!waitForMethodCompletion(createCrossThreadTask(&Peer::connect, m_peer.get(), url, protocol)))
         return false;

     return m_syncHelper->connectRequestResult();
 }

 void Bridge::send(const CString& message)
 {
     ASSERT(m_peer);
     OwnPtr<Vector<char>> data = adoptPtr(new Vector<char>(message.length()));
     if (message.length())
         memcpy(data->data(), static_cast<const char*>(message.data()), message.length());

     m_loaderProxy->postTaskToLoader(createCrossThreadTask(&Peer::sendTextAsCharVector, m_peer.get(), data.release()));
 }

 void Bridge::send(const DOMArrayBuffer& binaryData, unsigned byteOffset, unsigned byteLength)
 {
     ASSERT(m_peer);
     // ArrayBuffer isn't thread-safe, hence the content of ArrayBuffer is copied into Vector<char>.
     OwnPtr<Vector<char>> data = adoptPtr(new Vector<char>(byteLength));
     if (binaryData.byteLength())
         memcpy(data->data(), static_cast<const char*>(binaryData.data()) + byteOffset, byteLength);

     m_loaderProxy->postTaskToLoader(createCrossThreadTask(&Peer::sendBinaryAsCharVector, m_peer.get(), data.release()));
 }

 void Bridge::send(PassRefPtr<BlobDataHandle> data)
 {
     ASSERT(m_peer);
     m_loaderProxy->postTaskToLoader(createCrossThreadTask(&Peer::sendBlob, m_peer.get(), data));
 }

 void Bridge::close(int code, const String& reason)
 {
     ASSERT(m_peer);
     m_loaderProxy->postTaskToLoader(createCrossThreadTask(&Peer::close, m_peer.get(), code, reason));
 }

 void Bridge::fail(const String& reason, MessageLevel level, const String& sourceURL, unsigned lineNumber)
 {
     ASSERT(m_peer);
     m_loaderProxy->postTaskToLoader(createCrossThreadTask(&Peer::fail, m_peer.get(), reason, level, sourceURL, lineNumber));
 }

 void Bridge::disconnect()
 {
     if (!m_peer)
         return;

     waitForMethodCompletion(createCrossThreadTask(&Peer::disconnect, m_peer.get()));
     // Here |m_peer| is detached from the main thread and we can delete it.

     m_client = nullptr;
     m_peer = nullptr;
     m_syncHelper = nullptr;
     // We won't use this any more.
     m_workerGlobalScope.clear();
 }

 // Caller of this function should hold a reference to the bridge, because this function may call WebSocket::didClose() in the end,
 // which causes the bridge to get disconnected from the WebSocket and deleted if there is no other reference.
 bool Bridge::waitForMethodCompletion(PassOwnPtr<ExecutionContextTask> task)
 {
     ASSERT(m_workerGlobalScope);
     ASSERT(m_syncHelper);

     m_loaderProxy->postTaskToLoader(task);

     // We wait for the syncHelper event even if a shutdown event is fired.
     // See https://codereview.chromium.org/267323004/#msg43 for why we need to wait this.
     SafePointScope scope(ThreadState::HeapPointersOnStack);
     m_syncHelper->wait();
     // This is checking whether a shutdown event is fired or not.
     return !m_workerGlobalScope->thread()->terminated();
 }

 DEFINE_TRACE(Bridge)
 {
     visitor->trace(m_client);
     visitor->trace(m_workerGlobalScope);
     visitor->trace(m_syncHelper);
     visitor->trace(m_peer);
 }

 } // namespace blink
	/*
	* Copyright (C) 2011, 2012 Google Inc. All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions are
	* met:
	*
	* * Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* * Redistributions in binary form must reproduce the above
	* copyright notice, this list of conditions and the following disclaimer
	* in the documentation and/or other materials provided with the
	* distribution.
	* * Neither the name of Google Inc. nor the names of its
	* contributors may be used to endorse or promote products derived from
	* this software without specific prior written permission.
	*
	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*/

	#include "config.h"
	#include "modules/websockets/WorkerWebSocketChannel.h"

	#include "bindings/core/v8/ScriptCallStackFactory.h"
	#include "core/dom/CrossThreadTask.h"
	#include "core/dom/DOMArrayBuffer.h"
	#include "core/dom/Document.h"
	#include "core/dom/ExecutionContext.h"
	#include "core/dom/ExecutionContextTask.h"
	#include "core/fileapi/Blob.h"
	#include "core/inspector/ScriptCallFrame.h"
	#include "core/inspector/ScriptCallStack.h"
	#include "core/workers/WorkerGlobalScope.h"
	#include "core/workers/WorkerLoaderProxy.h"
	#include "core/workers/WorkerThread.h"
	#include "modules/websockets/DocumentWebSocketChannel.h"
	#include "platform/heap/SafePoint.h"
	#include "public/platform/Platform.h"
	#include "public/platform/WebWaitableEvent.h"
	#include "wtf/Assertions.h"
	#include "wtf/Functional.h"
	#include "wtf/MainThread.h"
	#include "wtf/text/CString.h"
	#include "wtf/text/WTFString.h"

	namespace blink {

	typedef WorkerWebSocketChannel::Bridge Bridge;
	typedef WorkerWebSocketChannel::Peer Peer;

	// Created and destroyed on the worker thread. All setters of this class are
	// called on the main thread, while all getters are called on the worker
	// thread. signalWorkerThread() must be called before any getters are called.
	class WebSocketChannelSyncHelper : public GarbageCollectedFinalized<WebSocketChannelSyncHelper> {
	public:
	static WebSocketChannelSyncHelper* create(PassOwnPtr<WebWaitableEvent> event)
	{
	return new WebSocketChannelSyncHelper(event);
	}

	~WebSocketChannelSyncHelper()
	{
	}

	// All setters are called on the main thread.
	void setConnectRequestResult(bool connectRequestResult)
	{
	m_connectRequestResult = connectRequestResult;
	}

	// All getter are called on the worker thread.
	bool connectRequestResult() const
	{
	return m_connectRequestResult;
	}

	// This should be called after all setters are called and before any
	// getters are called.
	void signalWorkerThread()
	{
	m_event->signal();
	}
	void wait()
	{
	m_event->wait();
	}

	DEFINE_INLINE_TRACE() { }

	private:
	explicit WebSocketChannelSyncHelper(PassOwnPtr<WebWaitableEvent> event)
	: m_event(event)
	, m_connectRequestResult(false)
	{
	}

	OwnPtr<WebWaitableEvent> m_event;
	bool m_connectRequestResult;
	};

	WorkerWebSocketChannel::WorkerWebSocketChannel(WorkerGlobalScope& workerGlobalScope, WebSocketChannelClient* client, const String& sourceURL, unsigned lineNumber)
	: m_bridge(new Bridge(client, workerGlobalScope))
	, m_sourceURLAtConnection(sourceURL)
	, m_lineNumberAtConnection(lineNumber)
	{
	m_bridge->initialize(sourceURL, lineNumber);
	}

	WorkerWebSocketChannel::~WorkerWebSocketChannel()
	{
	ASSERT(!m_bridge);
	}

	bool WorkerWebSocketChannel::connect(const KURL& url, const String& protocol)
	{
	ASSERT(m_bridge);
	return m_bridge->connect(url, protocol);
	}

	void WorkerWebSocketChannel::send(const CString& message)
	{
	ASSERT(m_bridge);
	m_bridge->send(message);
	}

	void WorkerWebSocketChannel::send(const DOMArrayBuffer& binaryData, unsigned byteOffset, unsigned byteLength)
	{
	ASSERT(m_bridge);
	m_bridge->send(binaryData, byteOffset, byteLength);
	}

	void WorkerWebSocketChannel::send(PassRefPtr<BlobDataHandle> blobData)
	{
	ASSERT(m_bridge);
	m_bridge->send(blobData);
	}

	void WorkerWebSocketChannel::close(int code, const String& reason)
	{
	ASSERT(m_bridge);
	m_bridge->close(code, reason);
	}

	void WorkerWebSocketChannel::fail(const String& reason, MessageLevel level, const String& sourceURL, unsigned lineNumber)
	{
	if (!m_bridge)
	return;

	RefPtrWillBeRawPtr<ScriptCallStack> callStack = currentScriptCallStack(1);
	if (callStack && callStack->size()) {
	// In order to emulate the ConsoleMessage behavior,
	// we should ignore the specified url and line number if
	// we can get the JavaScript context.
	m_bridge->fail(reason, level, callStack->at(0).sourceURL(), callStack->at(0).lineNumber());
	} else if (sourceURL.isEmpty() && !lineNumber) {
	// No information is specified by the caller - use the url
	// and the line number at the connection.
	m_bridge->fail(reason, level, m_sourceURLAtConnection, m_lineNumberAtConnection);
	} else {
	// Use the specified information.
	m_bridge->fail(reason, level, sourceURL, lineNumber);
	}
	}

	void WorkerWebSocketChannel::disconnect()
	{
	m_bridge->disconnect();
	m_bridge.clear();
	}

	DEFINE_TRACE(WorkerWebSocketChannel)
	{
	visitor->trace(m_bridge);
	WebSocketChannel::trace(visitor);
	}

	Peer::Peer(Bridge* bridge, PassRefPtr<WorkerLoaderProxy> loaderProxy, WebSocketChannelSyncHelper* syncHelper)
	: m_bridge(bridge)
	, m_loaderProxy(loaderProxy)
	, m_mainWebSocketChannel(nullptr)
	, m_syncHelper(syncHelper)
	{
	ASSERT(!isMainThread());
	}

	Peer::~Peer()
	{
	ASSERT(!isMainThread());
	}

	void Peer::initialize(const String& sourceURL, unsigned lineNumber, ExecutionContext* context)
	{
	ASSERT(isMainThread());
	Document* document = toDocument(context);
	m_mainWebSocketChannel = DocumentWebSocketChannel::create(document, this, sourceURL, lineNumber);
	m_syncHelper->signalWorkerThread();
	}

	void Peer::connect(const KURL& url, const String& protocol)
	{
	ASSERT(isMainThread());
	ASSERT(m_syncHelper);
	if (!m_mainWebSocketChannel) {
	m_syncHelper->setConnectRequestResult(false);
	} else {
	bool connectRequestResult = m_mainWebSocketChannel->connect(url, protocol);
	m_syncHelper->setConnectRequestResult(connectRequestResult);
	}
	m_syncHelper->signalWorkerThread();
	}

	void Peer::sendTextAsCharVector(PassOwnPtr<Vector<char>> data)
	{
	ASSERT(isMainThread());
	if (m_mainWebSocketChannel)
	m_mainWebSocketChannel->sendTextAsCharVector(data);
	}

	void Peer::sendBinaryAsCharVector(PassOwnPtr<Vector<char>> data)
	{
	ASSERT(isMainThread());
	if (m_mainWebSocketChannel)
	m_mainWebSocketChannel->sendBinaryAsCharVector(data);
	}

	void Peer::sendBlob(PassRefPtr<BlobDataHandle> blobData)
	{
	ASSERT(isMainThread());
	if (m_mainWebSocketChannel)
	m_mainWebSocketChannel->send(blobData);
	}

	void Peer::close(int code, const String& reason)
	{
	ASSERT(isMainThread());
	ASSERT(m_syncHelper);
	if (!m_mainWebSocketChannel)
	return;
	m_mainWebSocketChannel->close(code, reason);
	}

	void Peer::fail(const String& reason, MessageLevel level, const String& sourceURL, unsigned lineNumber)
	{
	ASSERT(isMainThread());
	ASSERT(m_syncHelper);
	if (!m_mainWebSocketChannel)
	return;
	m_mainWebSocketChannel->fail(reason, level, sourceURL, lineNumber);
	}

	void Peer::disconnect()
	{
	ASSERT(isMainThread());
	ASSERT(m_syncHelper);
	if (m_mainWebSocketChannel) {
	m_mainWebSocketChannel->disconnect();
	m_mainWebSocketChannel = nullptr;
	}
	m_syncHelper->signalWorkerThread();
	}

	static void workerGlobalScopeDidConnect(Bridge* bridge, const String& subprotocol, const String& extensions, ExecutionContext* context)
	{
	ASSERT_UNUSED(context, context->isWorkerGlobalScope());
	if (bridge->client())
	bridge->client()->didConnect(subprotocol, extensions);
	}

	void Peer::didConnect(const String& subprotocol, const String& extensions)
	{
	ASSERT(isMainThread());
	m_loaderProxy->postTaskToWorkerGlobalScope(createCrossThreadTask(&workerGlobalScopeDidConnect, m_bridge, subprotocol, extensions));
	}

	static void workerGlobalScopeDidReceiveTextMessage(Bridge* bridge, const String& payload, ExecutionContext* context)
	{
	ASSERT_UNUSED(context, context->isWorkerGlobalScope());
	if (bridge->client())
	bridge->client()->didReceiveTextMessage(payload);
	}

	void Peer::didReceiveTextMessage(const String& payload)
	{
	ASSERT(isMainThread());
	m_loaderProxy->postTaskToWorkerGlobalScope(createCrossThreadTask(&workerGlobalScopeDidReceiveTextMessage, m_bridge, payload));
	}

	static void workerGlobalScopeDidReceiveBinaryMessage(Bridge* bridge, PassOwnPtr<Vector<char>> payload, ExecutionContext* context)
	{
	ASSERT_UNUSED(context, context->isWorkerGlobalScope());
	if (bridge->client())
	bridge->client()->didReceiveBinaryMessage(payload);
	}

	void Peer::didReceiveBinaryMessage(PassOwnPtr<Vector<char>> payload)
	{
	ASSERT(isMainThread());
	m_loaderProxy->postTaskToWorkerGlobalScope(createCrossThreadTask(&workerGlobalScopeDidReceiveBinaryMessage, m_bridge, payload));
	}

	static void workerGlobalScopeDidConsumeBufferedAmount(Bridge* bridge, uint64_t consumed, ExecutionContext* context)
	{
	ASSERT_UNUSED(context, context->isWorkerGlobalScope());
	if (bridge->client())
	bridge->client()->didConsumeBufferedAmount(consumed);
	}

	void Peer::didConsumeBufferedAmount(uint64_t consumed)
	{
	ASSERT(isMainThread());
	m_loaderProxy->postTaskToWorkerGlobalScope(createCrossThreadTask(&workerGlobalScopeDidConsumeBufferedAmount, m_bridge, consumed));
	}

	static void workerGlobalScopeDidStartClosingHandshake(Bridge* bridge, ExecutionContext* context)
	{
	ASSERT_UNUSED(context, context->isWorkerGlobalScope());
	if (bridge->client())
	bridge->client()->didStartClosingHandshake();
	}

	void Peer::didStartClosingHandshake()
	{
	ASSERT(isMainThread());
	m_loaderProxy->postTaskToWorkerGlobalScope(createCrossThreadTask(&workerGlobalScopeDidStartClosingHandshake, m_bridge));
	}

	static void workerGlobalScopeDidClose(Bridge* bridge, WebSocketChannelClient::ClosingHandshakeCompletionStatus closingHandshakeCompletion, unsigned short code, const String& reason, ExecutionContext* context)
	{
	ASSERT_UNUSED(context, context->isWorkerGlobalScope());
	if (bridge->client())
	bridge->client()->didClose(closingHandshakeCompletion, code, reason);
	}

	void Peer::didClose(ClosingHandshakeCompletionStatus closingHandshakeCompletion, unsigned short code, const String& reason)
	{
	ASSERT(isMainThread());
	if (m_mainWebSocketChannel) {
	m_mainWebSocketChannel->disconnect();
	m_mainWebSocketChannel = nullptr;
	}
	m_loaderProxy->postTaskToWorkerGlobalScope(createCrossThreadTask(&workerGlobalScopeDidClose, m_bridge, closingHandshakeCompletion, code, reason));
	}

	static void workerGlobalScopeDidError(Bridge* bridge, ExecutionContext* context)
	{
	ASSERT_UNUSED(context, context->isWorkerGlobalScope());
	if (bridge->client())
	bridge->client()->didError();
	}

	void Peer::didError()
	{
	ASSERT(isMainThread());
	m_loaderProxy->postTaskToWorkerGlobalScope(createCrossThreadTask(&workerGlobalScopeDidError, m_bridge));
	}

	DEFINE_TRACE(Peer)
	{
	visitor->trace(m_bridge);
	visitor->trace(m_mainWebSocketChannel);
	visitor->trace(m_syncHelper);
	WebSocketChannelClient::trace(visitor);
	}

	Bridge::Bridge(WebSocketChannelClient* client, WorkerGlobalScope& workerGlobalScope)
	: m_client(client)
	, m_workerGlobalScope(workerGlobalScope)
	, m_loaderProxy(m_workerGlobalScope->thread()->workerLoaderProxy())
	, m_syncHelper(WebSocketChannelSyncHelper::create(adoptPtr(Platform::current()->createWaitableEvent())))
	, m_peer(new Peer(this, m_loaderProxy, m_syncHelper))
	{
	}

	Bridge::~Bridge()
	{
	ASSERT(!m_peer);
	}

	void Bridge::initialize(const String& sourceURL, unsigned lineNumber)
	{
	if (!waitForMethodCompletion(createCrossThreadTask(&Peer::initialize, m_peer.get(), sourceURL, lineNumber))) {
	// The worker thread has been signalled to shutdown before method completion.
	disconnect();
	}
	}

	bool Bridge::connect(const KURL& url, const String& protocol)
	{
	if (!m_peer)
	return false;

	if (!waitForMethodCompletion(createCrossThreadTask(&Peer::connect, m_peer.get(), url, protocol)))
	return false;

	return m_syncHelper->connectRequestResult();
	}

	void Bridge::send(const CString& message)
	{
	ASSERT(m_peer);
	OwnPtr<Vector<char>> data = adoptPtr(new Vector<char>(message.length()));
	if (message.length())
	memcpy(data->data(), static_cast<const char*>(message.data()), message.length());

	m_loaderProxy->postTaskToLoader(createCrossThreadTask(&Peer::sendTextAsCharVector, m_peer.get(), data.release()));
	}

	void Bridge::send(const DOMArrayBuffer& binaryData, unsigned byteOffset, unsigned byteLength)
	{
	ASSERT(m_peer);
	// ArrayBuffer isn't thread-safe, hence the content of ArrayBuffer is copied into Vector<char>.
	OwnPtr<Vector<char>> data = adoptPtr(new Vector<char>(byteLength));
	if (binaryData.byteLength())
	memcpy(data->data(), static_cast<const char*>(binaryData.data()) + byteOffset, byteLength);

	m_loaderProxy->postTaskToLoader(createCrossThreadTask(&Peer::sendBinaryAsCharVector, m_peer.get(), data.release()));
	}

	void Bridge::send(PassRefPtr<BlobDataHandle> data)
	{
	ASSERT(m_peer);
	m_loaderProxy->postTaskToLoader(createCrossThreadTask(&Peer::sendBlob, m_peer.get(), data));
	}

	void Bridge::close(int code, const String& reason)
	{
	ASSERT(m_peer);
	m_loaderProxy->postTaskToLoader(createCrossThreadTask(&Peer::close, m_peer.get(), code, reason));
	}

	void Bridge::fail(const String& reason, MessageLevel level, const String& sourceURL, unsigned lineNumber)
	{
	ASSERT(m_peer);
	m_loaderProxy->postTaskToLoader(createCrossThreadTask(&Peer::fail, m_peer.get(), reason, level, sourceURL, lineNumber));
	}

	void Bridge::disconnect()
	{
	if (!m_peer)
	return;

	waitForMethodCompletion(createCrossThreadTask(&Peer::disconnect, m_peer.get()));
	// Here \|m_peer\| is detached from the main thread and we can delete it.

	m_client = nullptr;
	m_peer = nullptr;
	m_syncHelper = nullptr;
	// We won't use this any more.
	m_workerGlobalScope.clear();
	}

	// Caller of this function should hold a reference to the bridge, because this function may call WebSocket::didClose() in the end,
	// which causes the bridge to get disconnected from the WebSocket and deleted if there is no other reference.
	bool Bridge::waitForMethodCompletion(PassOwnPtr<ExecutionContextTask> task)
	{
	ASSERT(m_workerGlobalScope);
	ASSERT(m_syncHelper);

	m_loaderProxy->postTaskToLoader(task);

	// We wait for the syncHelper event even if a shutdown event is fired.
	// See https://codereview.chromium.org/267323004/#msg43 for why we need to wait this.
	SafePointScope scope(ThreadState::HeapPointersOnStack);
	m_syncHelper->wait();
	// This is checking whether a shutdown event is fired or not.
	return !m_workerGlobalScope->thread()->terminated();
	}

	DEFINE_TRACE(Bridge)
	{
	visitor->trace(m_client);
	visitor->trace(m_workerGlobalScope);
	visitor->trace(m_syncHelper);
	visitor->trace(m_peer);
	}

	} // namespace blink