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      1 /*
      2  * Copyright (C) 2011, 2012 Google Inc.  All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #ifndef MainThreadWebSocketChannel_h
     32 #define MainThreadWebSocketChannel_h
     33 
     34 #include "core/fileapi/FileError.h"
     35 #include "core/fileapi/FileReaderLoaderClient.h"
     36 #include "core/frame/ConsoleTypes.h"
     37 #include "modules/websockets/WebSocketChannel.h"
     38 #include "modules/websockets/WebSocketDeflateFramer.h"
     39 #include "modules/websockets/WebSocketFrame.h"
     40 #include "modules/websockets/WebSocketHandshake.h"
     41 #include "modules/websockets/WebSocketPerMessageDeflate.h"
     42 #include "platform/Timer.h"
     43 #include "platform/network/SocketStreamHandleClient.h"
     44 #include "wtf/Deque.h"
     45 #include "wtf/Forward.h"
     46 #include "wtf/PassOwnPtr.h"
     47 #include "wtf/RefCounted.h"
     48 #include "wtf/Vector.h"
     49 #include "wtf/text/CString.h"
     50 
     51 namespace WebCore {
     52 
     53 class BlobDataHandle;
     54 class Document;
     55 class FileReaderLoader;
     56 class SocketStreamHandle;
     57 class SocketStreamError;
     58 class WebSocketChannelClient;
     59 
     60 class MainThreadWebSocketChannel : public RefCounted<MainThreadWebSocketChannel>, public SocketStreamHandleClient, public WebSocketChannel, public FileReaderLoaderClient {
     61     WTF_MAKE_FAST_ALLOCATED;
     62 public:
     63     // You can specify the source file and the line number information
     64     // explicitly by passing the last parameter.
     65     // In the usual case, they are set automatically and you don't have to
     66     // pass it.
     67     static PassRefPtr<MainThreadWebSocketChannel> create(Document* document, WebSocketChannelClient* client, const String& sourceURL = String(), unsigned lineNumber = 0) { return adoptRef(new MainThreadWebSocketChannel(document, client, sourceURL, lineNumber)); }
     68     virtual ~MainThreadWebSocketChannel();
     69 
     70     bool send(const char* data, int length);
     71 
     72     // WebSocketChannel functions.
     73     virtual void connect(const KURL&, const String& protocol) OVERRIDE;
     74     virtual String subprotocol() OVERRIDE;
     75     virtual String extensions() OVERRIDE;
     76     virtual WebSocketChannel::SendResult send(const String& message) OVERRIDE;
     77     virtual WebSocketChannel::SendResult send(const ArrayBuffer&, unsigned byteOffset, unsigned byteLength) OVERRIDE;
     78     virtual WebSocketChannel::SendResult send(PassRefPtr<BlobDataHandle>) OVERRIDE;
     79     virtual unsigned long bufferedAmount() const OVERRIDE;
     80     // Start closing handshake. Use the CloseEventCodeNotSpecified for the code
     81     // argument to omit payload.
     82     virtual void close(int code, const String& reason) OVERRIDE;
     83     virtual void fail(const String& reason, MessageLevel, const String&, unsigned lineNumber) OVERRIDE;
     84     using WebSocketChannel::fail;
     85     virtual void disconnect() OVERRIDE;
     86 
     87     virtual void suspend() OVERRIDE;
     88     virtual void resume() OVERRIDE;
     89 
     90     // SocketStreamHandleClient functions.
     91     virtual void willOpenSocketStream(SocketStreamHandle*) OVERRIDE;
     92     virtual void didOpenSocketStream(SocketStreamHandle*) OVERRIDE;
     93     virtual void didCloseSocketStream(SocketStreamHandle*) OVERRIDE;
     94     virtual void didReceiveSocketStreamData(SocketStreamHandle*, const char*, int) OVERRIDE;
     95     virtual void didUpdateBufferedAmount(SocketStreamHandle*, size_t bufferedAmount) OVERRIDE;
     96     virtual void didFailSocketStream(SocketStreamHandle*, const SocketStreamError&) OVERRIDE;
     97 
     98     // FileReaderLoaderClient functions.
     99     virtual void didStartLoading();
    100     virtual void didReceiveData();
    101     virtual void didFinishLoading();
    102     virtual void didFail(FileError::ErrorCode);
    103 
    104     using RefCounted<MainThreadWebSocketChannel>::ref;
    105     using RefCounted<MainThreadWebSocketChannel>::deref;
    106 
    107 protected:
    108     // WebSocketChannel functions.
    109     virtual void refWebSocketChannel() OVERRIDE { ref(); }
    110     virtual void derefWebSocketChannel() OVERRIDE { deref(); }
    111 
    112 private:
    113     MainThreadWebSocketChannel(Document*, WebSocketChannelClient*, const String&, unsigned);
    114 
    115     void disconnectHandle();
    116 
    117     bool appendToBuffer(const char* data, size_t len);
    118     void skipBuffer(size_t len);
    119     // Repeats parsing data from m_buffer until instructed to stop.
    120     void processBuffer();
    121     // Parses a handshake response or one frame from m_buffer and processes it.
    122     bool processOneItemFromBuffer();
    123     void resumeTimerFired(Timer<MainThreadWebSocketChannel>*);
    124     void startClosingHandshake(int code, const String& reason);
    125     void closingTimerFired(Timer<MainThreadWebSocketChannel>*);
    126 
    127     // Parses one frame from m_buffer and processes it.
    128     bool processFrame();
    129 
    130     // It is allowed to send a Blob as a binary frame if hybi-10 protocol is in use. Sending a Blob
    131     // can be delayed because it must be read asynchronously. Other types of data (String or
    132     // ArrayBuffer) may also be blocked by preceding sending request of a Blob.
    133     //
    134     // To address this situation, messages to be sent need to be stored in a queue. Whenever a new
    135     // data frame is going to be sent, it first must go to the queue. Items in the queue are processed
    136     // in the order they were put into the queue. Sending request of a Blob blocks further processing
    137     // until the Blob is completely read and sent to the socket stream.
    138     enum QueuedFrameType {
    139         QueuedFrameTypeString,
    140         QueuedFrameTypeVector,
    141         QueuedFrameTypeBlob
    142     };
    143     struct QueuedFrame {
    144         WebSocketFrame::OpCode opCode;
    145         QueuedFrameType frameType;
    146         // Only one of the following items is used, according to the value of frameType.
    147         CString stringData;
    148         Vector<char> vectorData;
    149         RefPtr<BlobDataHandle> blobData;
    150     };
    151     void enqueueTextFrame(const CString&);
    152     void enqueueRawFrame(WebSocketFrame::OpCode, const char* data, size_t dataLength);
    153     void enqueueBlobFrame(WebSocketFrame::OpCode, PassRefPtr<BlobDataHandle>);
    154 
    155     void failAsError(const String& reason) { fail(reason, ErrorMessageLevel, m_sourceURLAtConstruction, m_lineNumberAtConstruction); }
    156     void processOutgoingFrameQueue();
    157     void abortOutgoingFrameQueue();
    158 
    159     enum OutgoingFrameQueueStatus {
    160         // It is allowed to put a new item into the queue.
    161         OutgoingFrameQueueOpen,
    162         // Close frame has already been put into the queue but may not have been sent yet;
    163         // m_handle->close() will be called as soon as the queue is cleared. It is not
    164         // allowed to put a new item into the queue.
    165         OutgoingFrameQueueClosing,
    166         // Close frame has been sent or the queue was aborted. It is not allowed to put
    167         // a new item to the queue.
    168         OutgoingFrameQueueClosed
    169     };
    170 
    171     // In principle, this method is called only by processOutgoingFrameQueue().
    172     // It does work necessary to build frames including Blob loading for queued
    173     // data in order. Calling this method directly jumps in the process.
    174     bool sendFrame(WebSocketFrame::OpCode, const char* data, size_t dataLength);
    175 
    176     enum BlobLoaderStatus {
    177         BlobLoaderNotStarted,
    178         BlobLoaderStarted,
    179         BlobLoaderFinished,
    180         BlobLoaderFailed
    181     };
    182 
    183     enum ChannelState {
    184         ChannelIdle,
    185         ChannelClosing,
    186         ChannelClosed
    187     };
    188 
    189     Document* m_document;
    190     WebSocketChannelClient* m_client;
    191     OwnPtr<WebSocketHandshake> m_handshake;
    192     RefPtr<SocketStreamHandle> m_handle;
    193     Vector<char> m_buffer;
    194 
    195     Timer<MainThreadWebSocketChannel> m_resumeTimer;
    196     bool m_suspended;
    197     bool m_didFailOfClientAlreadyRun;
    198     // Set to true iff this instance called disconnect() on m_handle.
    199     bool m_hasCalledDisconnectOnHandle;
    200     bool m_receivedClosingHandshake;
    201     Timer<MainThreadWebSocketChannel> m_closingTimer;
    202     ChannelState m_state;
    203     bool m_shouldDiscardReceivedData;
    204     unsigned long m_unhandledBufferedAmount;
    205 
    206     unsigned long m_identifier; // m_identifier == 0 means that we could not obtain a valid identifier.
    207 
    208     // Private members only for hybi-10 protocol.
    209     bool m_hasContinuousFrame;
    210     WebSocketFrame::OpCode m_continuousFrameOpCode;
    211     Vector<char> m_continuousFrameData;
    212     unsigned short m_closeEventCode;
    213     String m_closeEventReason;
    214 
    215     Deque<OwnPtr<QueuedFrame> > m_outgoingFrameQueue;
    216     OutgoingFrameQueueStatus m_outgoingFrameQueueStatus;
    217 
    218     // FIXME: Load two or more Blobs simultaneously for better performance.
    219     OwnPtr<FileReaderLoader> m_blobLoader;
    220     BlobLoaderStatus m_blobLoaderStatus;
    221 
    222     // Source code position where construction happened. To be used to show a
    223     // console message where no JS callstack info available.
    224     String m_sourceURLAtConstruction;
    225     unsigned m_lineNumberAtConstruction;
    226 
    227     WebSocketPerMessageDeflate m_perMessageDeflate;
    228 
    229     WebSocketDeflateFramer m_deflateFramer;
    230 };
    231 
    232 } // namespace WebCore
    233 
    234 #endif // MainThreadWebSocketChannel_h
    235