src/third_party/WebKit/Source/core/workers/Worker.cpp

   1 /*
   2  * Copyright (C) 2008, 2010 Apple Inc. All Rights Reserved.
   3  * Copyright (C) 2009 Google Inc. All Rights Reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
  15  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  17  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
  18  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  19  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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  22  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  24  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  *
  26  */
  27
  28 #include "config.h"
  29 #include "core/workers/Worker.h"
  30
  31 #include "bindings/core/v8/ExceptionState.h"
  32 #include "core/dom/Document.h"
  33 #include "core/events/MessageEvent.h"
  34 #include "core/fetch/ResourceFetcher.h"
  35 #include "core/inspector/InspectorInstrumentation.h"
  36 #include "core/frame/LocalDOMWindow.h"
  37 #include "core/frame/UseCounter.h"
  38 #include "core/workers/WorkerGlobalScopeProxy.h"
  39 #include "core/workers/WorkerGlobalScopeProxyProvider.h"
  40 #include "core/workers/WorkerScriptLoader.h"
  41 #include "core/workers/WorkerThread.h"
  42 #include "wtf/MainThread.h"
  43
  44 namespace blink {
  45
  46 inline Worker::Worker(ExecutionContext* context)
  47     : AbstractWorker(context)
  48     , m_contextProxy(nullptr)
  49 {
  50 }
  51
  52 PassRefPtrWillBeRawPtr<Worker> Worker::create(ExecutionContext* context, const String& url, ExceptionState& exceptionState)
  53 {
  54     ASSERT(isMainThread());
  55     Document* document = toDocument(context);
  56     UseCounter::count(context, UseCounter::WorkerStart);
  57     if (!document->page()) {
  58         exceptionState.throwDOMException(InvalidAccessError, "The context provided is invalid.");
  59         return nullptr;
  60     }
  61     WorkerGlobalScopeProxyProvider* proxyProvider = WorkerGlobalScopeProxyProvider::from(*document->page());
  62     ASSERT(proxyProvider);
  63
  64     RefPtrWillBeRawPtr<Worker> worker = adoptRefWillBeNoop(new Worker(context));
  65
  66     worker->suspendIfNeeded();
  67
  68     KURL scriptURL = worker->resolveURL(url, exceptionState);
  69     if (scriptURL.isEmpty())
  70         return nullptr;
  71
  72     worker->m_scriptLoader = WorkerScriptLoader::create();
  73     worker->m_scriptLoader->loadAsynchronously(*context, scriptURL, DenyCrossOriginRequests, worker.get());
  74     worker->m_contextProxy = proxyProvider->createWorkerGlobalScopeProxy(worker.get());
  75     return worker.release();
  76 }
  77
  78 Worker::~Worker()
  79 {
  80     ASSERT(isMainThread());
  81     if (!m_contextProxy)
  82         return;
  83     ASSERT(executionContext()); // The context is protected by worker context proxy, so it cannot be destroyed while a Worker exists.
  84     m_contextProxy->workerObjectDestroyed();
  85 }
  86
  87 const AtomicString& Worker::interfaceName() const
  88 {
  89     return EventTargetNames::Worker;
  90 }
  91
  92 void Worker::postMessage(ExecutionContext*, PassRefPtr<SerializedScriptValue> message, const MessagePortArray* ports, ExceptionState& exceptionState)
  93 {
  94     ASSERT(m_contextProxy);
  95     // Disentangle the port in preparation for sending it to the remote context.
  96     OwnPtr<MessagePortChannelArray> channels = MessagePort::disentanglePorts(ports, exceptionState);
  97     if (exceptionState.hadException())
  98         return;
  99     m_contextProxy->postMessageToWorkerGlobalScope(message, channels.release());
 100 }
 101
 102 void Worker::terminate()
 103 {
 104     if (m_contextProxy)
 105         m_contextProxy->terminateWorkerGlobalScope();
 106 }
 107
 108 void Worker::stop()
 109 {
 110     terminate();
 111 }
 112
 113 bool Worker::hasPendingActivity() const
 114 {
 115     // The worker context does not exist while loading, so we must ensure that the worker object is not collected, nor are its event listeners.
 116     return (m_contextProxy && m_contextProxy->hasPendingActivity()) || m_scriptLoader;
 117 }
 118
 119 void Worker::didReceiveResponse(unsigned long identifier, const ResourceResponse&)
 120 {
 121     InspectorInstrumentation::didReceiveScriptResponse(executionContext(), identifier);
 122 }
 123
 124 void Worker::notifyFinished()
 125 {
 126     if (m_scriptLoader->failed()) {
 127         dispatchEvent(Event::createCancelable(EventTypeNames::error));
 128     } else {
 129         ASSERT(m_contextProxy);
 130         WorkerThreadStartMode startMode = DontPauseWorkerGlobalScopeOnStart;
 131         if (InspectorInstrumentation::shouldPauseDedicatedWorkerOnStart(executionContext()))
 132             startMode = PauseWorkerGlobalScopeOnStart;
 133         m_contextProxy->startWorkerGlobalScope(m_scriptLoader->url(), executionContext()->userAgent(m_scriptLoader->url()), m_scriptLoader->script(), startMode);
 134         InspectorInstrumentation::scriptImported(executionContext(), m_scriptLoader->identifier(), m_scriptLoader->script());
 135     }
 136     m_scriptLoader = nullptr;
 137 }
 138
 139 void Worker::trace(Visitor* visitor)
 140 {
 141     AbstractWorker::trace(visitor);
 142 }
 143
 144 } // namespace blink