[WebSocket] bufferedAmount should not decrease inside a task.

Source/modules/websockets/WorkerThreadableWebSocketChannel.cpp

 /*
  * 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
@@ skipping 56 matching lines @@
 
     // All setters are called on the main thread.
     void setConnectRequestResult(bool connectRequestResult)
     {
         m_connectRequestResult = connectRequestResult;
     }
     void setSendRequestResult(WebSocketChannel::SendResult sendRequestResult)
     {
         m_sendRequestResult = sendRequestResult;
     }
-    void setBufferedAmount(unsigned long bufferedAmount)
-    {
-        m_bufferedAmount = bufferedAmount;
-    }
 
     // All getter are called on the worker thread.
     bool connectRequestResult() const
     {
         return m_connectRequestResult;
     }
     WebSocketChannel::SendResult sendRequestResult() const
     {
         return m_sendRequestResult;
     }
-    unsigned long bufferedAmount() const
-    {
-        return m_bufferedAmount;
-    }
 
     // This should be called after all setters are called and before any
     // getters are called.
     void signalWorkerThread()
     {
         m_event->signal();
     }
 
     blink::WebWaitableEvent* event() const
     {
         return m_event.get();
     }
 
 private:
     ThreadableWebSocketChannelSyncHelper(PassOwnPtr<blink::WebWaitableEvent> event)
         : m_event(event)
         , m_connectRequestResult(false)
         , m_sendRequestResult(WebSocketChannel::SendFail)
-        , m_bufferedAmount(0)
     {
     }
 
     OwnPtr<blink::WebWaitableEvent> m_event;
     bool m_connectRequestResult;
     WebSocketChannel::SendResult m_sendRequestResult;
-    unsigned long m_bufferedAmount;
 };
 
 WorkerThreadableWebSocketChannel::WorkerThreadableWebSocketChannel(WorkerGlobalScope& workerGlobalScope, WebSocketChannelClient* client, const String& sourceURL, unsigned lineNumber)
     : m_workerClientWrapper(ThreadableWebSocketChannelClientWrapper::create(client))
     , m_bridge(Bridge::create(m_workerClientWrapper, workerGlobalScope))
     , m_sourceURLAtConnection(sourceURL)
     , m_lineNumberAtConnection(lineNumber)
 {
     ASSERT(m_workerClientWrapper.get());
     m_bridge->initialize(sourceURL, lineNumber);
@@ skipping 26 matching lines @@
     return m_bridge->send(binaryData, byteOffset, byteLength);
 }
 
 WebSocketChannel::SendResult WorkerThreadableWebSocketChannel::send(PassRefPtr<BlobDataHandle> blobData)
 {
     if (!m_bridge)
         return WebSocketChannel::SendFail;
     return m_bridge->send(blobData);
 }
 
-unsigned long WorkerThreadableWebSocketChannel::bufferedAmount() const
-{
-    if (!m_bridge)
-        return 0;
-    return m_bridge->bufferedAmount();
-}
-
 void WorkerThreadableWebSocketChannel::close(int code, const String& reason)
 {
     if (m_bridge)
         m_bridge->close(code, reason);
 }
 
 void WorkerThreadableWebSocketChannel::fail(const String& reason, MessageLevel level, const String& sourceURL, unsigned lineNumber)
 {
     if (!m_bridge)
         return;
@@ skipping 106 matching lines @@
     ASSERT(isMainThread());
     if (!m_mainWebSocketChannel) {
         m_syncHelper->setSendRequestResult(WebSocketChannel::SendFail);
     } else {
         WebSocketChannel::SendResult sendRequestResult = m_mainWebSocketChannel->send(blobData);
         m_syncHelper->setSendRequestResult(sendRequestResult);
     }
     m_syncHelper->signalWorkerThread();
 }
 
-void WorkerThreadableWebSocketChannel::Peer::bufferedAmount()
-{
-    ASSERT(isMainThread());
-    if (!m_mainWebSocketChannel) {
-        m_syncHelper->setBufferedAmount(0);
-    } else {
-        unsigned long bufferedAmount = m_mainWebSocketChannel->bufferedAmount();
-        m_syncHelper->setBufferedAmount(bufferedAmount);
-    }
-    m_syncHelper->signalWorkerThread();
-}
-
 void WorkerThreadableWebSocketChannel::Peer::close(int code, const String& reason)
 {
     ASSERT(isMainThread());
     if (!m_mainWebSocketChannel)
         return;
     m_mainWebSocketChannel->close(code, reason);
 }
 
 void WorkerThreadableWebSocketChannel::Peer::fail(const String& reason, MessageLevel level, const String& sourceURL, unsigned lineNumber)
 {
@@ skipping 41 matching lines @@
     ASSERT_UNUSED(context, context->isWorkerGlobalScope());
     workerClientWrapper->didReceiveBinaryData(binaryData);
 }
 
 void WorkerThreadableWebSocketChannel::Peer::didReceiveBinaryData(PassOwnPtr<Vector<char> > binaryData)
 {
     ASSERT(isMainThread());
     m_loaderProxy.postTaskToWorkerGlobalScope(createCallbackTask(&workerGlobalScopeDidReceiveBinaryData, m_workerClientWrapper.get(), binaryData));
 }
 
-static void workerGlobalScopeDidUpdateBufferedAmount(ExecutionContext* context, PassRefPtrWillBeRawPtr<ThreadableWebSocketChannelClientWrapper> workerClientWrapper, unsigned long bufferedAmount)
+static void workerGlobalScopeDidConsumeBufferedAmount(ExecutionContext* context, PassRefPtrWillBeRawPtr<ThreadableWebSocketChannelClientWrapper> workerClientWrapper, unsigned long consumed)
 {
     ASSERT_UNUSED(context, context->isWorkerGlobalScope());
-    workerClientWrapper->didUpdateBufferedAmount(bufferedAmount);
+    workerClientWrapper->didConsumeBufferedAmount(consumed);
 }
 
-void WorkerThreadableWebSocketChannel::Peer::didUpdateBufferedAmount(unsigned long bufferedAmount)
+void WorkerThreadableWebSocketChannel::Peer::didConsumeBufferedAmount(unsigned long consumed)
 {
     ASSERT(isMainThread());
-    m_loaderProxy.postTaskToWorkerGlobalScope(createCallbackTask(&workerGlobalScopeDidUpdateBufferedAmount, m_workerClientWrapper.get(), bufferedAmount));
+    m_loaderProxy.postTaskToWorkerGlobalScope(createCallbackTask(&workerGlobalScopeDidConsumeBufferedAmount, m_workerClientWrapper.get(), consumed));
 }
 
 static void workerGlobalScopeDidStartClosingHandshake(ExecutionContext* context, PassRefPtrWillBeRawPtr<ThreadableWebSocketChannelClientWrapper> workerClientWrapper)
 {
     ASSERT_UNUSED(context, context->isWorkerGlobalScope());
     workerClientWrapper->didStartClosingHandshake();
 }
 
 void WorkerThreadableWebSocketChannel::Peer::didStartClosingHandshake()
 {
     ASSERT(isMainThread());
     m_loaderProxy.postTaskToWorkerGlobalScope(createCallbackTask(&workerGlobalScopeDidStartClosingHandshake, m_workerClientWrapper.get()));
 }
 
-static void workerGlobalScopeDidClose(ExecutionContext* context, PassRefPtrWillBeRawPtr<ThreadableWebSocketChannelClientWrapper> workerClientWrapper, unsigned long unhandledBufferedAmount, WebSocketChannelClient::ClosingHandshakeCompletionStatus closingHandshakeCompletion, unsigned short code, const String& reason)
+static void workerGlobalScopeDidClose(ExecutionContext* context, PassRefPtrWillBeRawPtr<ThreadableWebSocketChannelClientWrapper> workerClientWrapper, WebSocketChannelClient::ClosingHandshakeCompletionStatus closingHandshakeCompletion, unsigned short code, const String& reason)
 {
     ASSERT_UNUSED(context, context->isWorkerGlobalScope());
-    workerClientWrapper->didClose(unhandledBufferedAmount, closingHandshakeCompletion, code, reason);
+    workerClientWrapper->didClose(closingHandshakeCompletion, code, reason);
 }
 
-void WorkerThreadableWebSocketChannel::Peer::didClose(unsigned long unhandledBufferedAmount, ClosingHandshakeCompletionStatus closingHandshakeCompletion, unsigned short code, const String& reason)
+void WorkerThreadableWebSocketChannel::Peer::didClose(ClosingHandshakeCompletionStatus closingHandshakeCompletion, unsigned short code, const String& reason)
 {
     ASSERT(isMainThread());
     m_mainWebSocketChannel = nullptr;
-    m_loaderProxy.postTaskToWorkerGlobalScope(createCallbackTask(&workerGlobalScopeDidClose, m_workerClientWrapper.get(), unhandledBufferedAmount, closingHandshakeCompletion, code, reason));
+    m_loaderProxy.postTaskToWorkerGlobalScope(createCallbackTask(&workerGlobalScopeDidClose, m_workerClientWrapper.get(), closingHandshakeCompletion, code, reason));
 }
 
 static void workerGlobalScopeDidReceiveMessageError(ExecutionContext* context, PassRefPtrWillBeRawPtr<ThreadableWebSocketChannelClientWrapper> workerClientWrapper)
 {
     ASSERT_UNUSED(context, context->isWorkerGlobalScope());
     workerClientWrapper->didReceiveMessageError();
 }
 
 void WorkerThreadableWebSocketChannel::Peer::didReceiveMessageError()
 {
@@ skipping 77 matching lines @@
     if (hasTerminatedPeer())
         return WebSocketChannel::SendFail;
 
     RefPtr<Bridge> protect(this);
     if (!waitForMethodCompletion(CallClosureTask::create(bind(&Peer::sendBlob, m_peer, data))))
         return WebSocketChannel::SendFail;
 
     return m_syncHelper->sendRequestResult();
 }
 
-unsigned long WorkerThreadableWebSocketChannel::Bridge::bufferedAmount()
-{
-    if (hasTerminatedPeer())
-        return 0;
-
-    RefPtr<Bridge> protect(this);
-    if (!waitForMethodCompletion(CallClosureTask::create(bind(&Peer::bufferedAmount, m_peer))))
-        return 0;
-
-    return m_syncHelper->bufferedAmount();
-}
-
 void WorkerThreadableWebSocketChannel::Bridge::close(int code, const String& reason)
 {
     if (hasTerminatedPeer())
         return;
 
     m_loaderProxy.postTaskToLoader(CallClosureTask::create(bind(&Peer::close, m_peer, code, reason.isolatedCopy())));
 }
 
 void WorkerThreadableWebSocketChannel::Bridge::fail(const String& reason, MessageLevel level, const String& sourceURL, unsigned lineNumber)
 {
@@ skipping 38 matching lines @@
     m_loaderProxy.postTaskToLoader(CallClosureTask::create(bind(&Peer::destroy, m_peer)));
     // Peer::destroy() deletes m_peer and then m_syncHelper will be released.
     // We must not touch m_syncHelper any more.
     m_syncHelper = 0;
 
     // We won't use this any more.
     m_workerGlobalScope = nullptr;
 }
 
 } // namespace WebCore