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/*
* 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.
*/
#ifndef MainThreadWebSocketChannel_h
#define MainThreadWebSocketChannel_h
#include "core/fileapi/FileError.h"
#include "core/fileapi/FileReaderLoaderClient.h"
#include "core/frame/ConsoleTypes.h"
#include "modules/websockets/WebSocketChannel.h"
#include "modules/websockets/WebSocketDeflateFramer.h"
#include "modules/websockets/WebSocketFrame.h"
#include "modules/websockets/WebSocketHandshake.h"
#include "modules/websockets/WebSocketPerMessageDeflate.h"
#include "platform/Timer.h"
#include "platform/network/SocketStreamHandleClient.h"
#include "wtf/Deque.h"
#include "wtf/Forward.h"
#include "wtf/PassOwnPtr.h"
#include "wtf/RefCounted.h"
#include "wtf/Vector.h"
#include "wtf/text/CString.h"
namespace WebCore {
class BlobDataHandle;
class Document;
class FileReaderLoader;
class SocketStreamHandle;
class SocketStreamError;
class WebSocketChannelClient;
class MainThreadWebSocketChannel : public RefCounted<MainThreadWebSocketChannel>, public SocketStreamHandleClient, public WebSocketChannel, public FileReaderLoaderClient {
WTF_MAKE_FAST_ALLOCATED;
public:
// You can specify the source file and the line number information
// explicitly by passing the last parameter.
// In the usual case, they are set automatically and you don't have to
// pass it.
static PassRefPtr<MainThreadWebSocketChannel> create(Document* document, WebSocketChannelClient* client, const String& sourceURL = String(), unsigned lineNumber = 0) { return adoptRef(new MainThreadWebSocketChannel(document, client, sourceURL, lineNumber)); }
virtual ~MainThreadWebSocketChannel();
bool send(const char* data, int length);
// WebSocketChannel functions.
virtual void connect(const KURL&, const String& protocol) OVERRIDE;
virtual String subprotocol() OVERRIDE;
virtual String extensions() OVERRIDE;
virtual WebSocketChannel::SendResult send(const String& message) OVERRIDE;
virtual WebSocketChannel::SendResult send(const ArrayBuffer&, unsigned byteOffset, unsigned byteLength) OVERRIDE;
virtual WebSocketChannel::SendResult send(PassRefPtr<BlobDataHandle>) OVERRIDE;
virtual unsigned long bufferedAmount() const OVERRIDE;
// Start closing handshake. Use the CloseEventCodeNotSpecified for the code
// argument to omit payload.
virtual void close(int code, const String& reason) OVERRIDE;
virtual void fail(const String& reason, MessageLevel, const String&, unsigned lineNumber) OVERRIDE;
using WebSocketChannel::fail;
virtual void disconnect() OVERRIDE;
virtual void suspend() OVERRIDE;
virtual void resume() OVERRIDE;
// SocketStreamHandleClient functions.
virtual void willOpenSocketStream(SocketStreamHandle*) OVERRIDE;
virtual void didOpenSocketStream(SocketStreamHandle*) OVERRIDE;
virtual void didCloseSocketStream(SocketStreamHandle*) OVERRIDE;
virtual void didReceiveSocketStreamData(SocketStreamHandle*, const char*, int) OVERRIDE;
virtual void didUpdateBufferedAmount(SocketStreamHandle*, size_t bufferedAmount) OVERRIDE;
virtual void didFailSocketStream(SocketStreamHandle*, const SocketStreamError&) OVERRIDE;
// FileReaderLoaderClient functions.
virtual void didStartLoading();
virtual void didReceiveData();
virtual void didFinishLoading();
virtual void didFail(FileError::ErrorCode);
using RefCounted<MainThreadWebSocketChannel>::ref;
using RefCounted<MainThreadWebSocketChannel>::deref;
protected:
// WebSocketChannel functions.
virtual void refWebSocketChannel() OVERRIDE { ref(); }
virtual void derefWebSocketChannel() OVERRIDE { deref(); }
private:
MainThreadWebSocketChannel(Document*, WebSocketChannelClient*, const String&, unsigned);
void disconnectHandle();
bool appendToBuffer(const char* data, size_t len);
void skipBuffer(size_t len);
// Repeats parsing data from m_buffer until instructed to stop.
void processBuffer();
// Parses a handshake response or one frame from m_buffer and processes it.
bool processOneItemFromBuffer();
void resumeTimerFired(Timer<MainThreadWebSocketChannel>*);
void startClosingHandshake(int code, const String& reason);
void closingTimerFired(Timer<MainThreadWebSocketChannel>*);
// Parses one frame from m_buffer and processes it.
bool processFrame();
// It is allowed to send a Blob as a binary frame if hybi-10 protocol is in use. Sending a Blob
// can be delayed because it must be read asynchronously. Other types of data (String or
// ArrayBuffer) may also be blocked by preceding sending request of a Blob.
//
// To address this situation, messages to be sent need to be stored in a queue. Whenever a new
// data frame is going to be sent, it first must go to the queue. Items in the queue are processed
// in the order they were put into the queue. Sending request of a Blob blocks further processing
// until the Blob is completely read and sent to the socket stream.
enum QueuedFrameType {
QueuedFrameTypeString,
QueuedFrameTypeVector,
QueuedFrameTypeBlob
};
struct QueuedFrame {
WebSocketFrame::OpCode opCode;
QueuedFrameType frameType;
// Only one of the following items is used, according to the value of frameType.
CString stringData;
Vector<char> vectorData;
RefPtr<BlobDataHandle> blobData;
};
void enqueueTextFrame(const CString&);
void enqueueRawFrame(WebSocketFrame::OpCode, const char* data, size_t dataLength);
void enqueueBlobFrame(WebSocketFrame::OpCode, PassRefPtr<BlobDataHandle>);
void failAsError(const String& reason) { fail(reason, ErrorMessageLevel, m_sourceURLAtConstruction, m_lineNumberAtConstruction); }
void processOutgoingFrameQueue();
void abortOutgoingFrameQueue();
enum OutgoingFrameQueueStatus {
// It is allowed to put a new item into the queue.
OutgoingFrameQueueOpen,
// Close frame has already been put into the queue but may not have been sent yet;
// m_handle->close() will be called as soon as the queue is cleared. It is not
// allowed to put a new item into the queue.
OutgoingFrameQueueClosing,
// Close frame has been sent or the queue was aborted. It is not allowed to put
// a new item to the queue.
OutgoingFrameQueueClosed
};
// In principle, this method is called only by processOutgoingFrameQueue().
// It does work necessary to build frames including Blob loading for queued
// data in order. Calling this method directly jumps in the process.
bool sendFrame(WebSocketFrame::OpCode, const char* data, size_t dataLength);
enum BlobLoaderStatus {
BlobLoaderNotStarted,
BlobLoaderStarted,
BlobLoaderFinished,
BlobLoaderFailed
};
enum ChannelState {
ChannelIdle,
ChannelClosing,
ChannelClosed
};
Document* m_document;
WebSocketChannelClient* m_client;
OwnPtr<WebSocketHandshake> m_handshake;
RefPtr<SocketStreamHandle> m_handle;
Vector<char> m_buffer;
Timer<MainThreadWebSocketChannel> m_resumeTimer;
bool m_suspended;
bool m_didFailOfClientAlreadyRun;
// Set to true iff this instance called disconnect() on m_handle.
bool m_hasCalledDisconnectOnHandle;
bool m_receivedClosingHandshake;
Timer<MainThreadWebSocketChannel> m_closingTimer;
ChannelState m_state;
bool m_shouldDiscardReceivedData;
unsigned long m_unhandledBufferedAmount;
unsigned long m_identifier; // m_identifier == 0 means that we could not obtain a valid identifier.
// Private members only for hybi-10 protocol.
bool m_hasContinuousFrame;
WebSocketFrame::OpCode m_continuousFrameOpCode;
Vector<char> m_continuousFrameData;
unsigned short m_closeEventCode;
String m_closeEventReason;
Deque<OwnPtr<QueuedFrame> > m_outgoingFrameQueue;
OutgoingFrameQueueStatus m_outgoingFrameQueueStatus;
// FIXME: Load two or more Blobs simultaneously for better performance.
OwnPtr<FileReaderLoader> m_blobLoader;
BlobLoaderStatus m_blobLoaderStatus;
// Source code position where construction happened. To be used to show a
// console message where no JS callstack info available.
String m_sourceURLAtConstruction;
unsigned m_lineNumberAtConstruction;
WebSocketPerMessageDeflate m_perMessageDeflate;
WebSocketDeflateFramer m_deflateFramer;
};
} // namespace WebCore
#endif // MainThreadWebSocketChannel_h
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