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, 20 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 21 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 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/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 WebCore { 45 46 inline Worker::Worker(ExecutionContext* context) 47 : AbstractWorker(context) 48 , m_contextProxy(0) 49 { 50 ScriptWrappable::init(this); 51 } 52 53 PassRefPtrWillBeRawPtr<Worker> Worker::create(ExecutionContext* context, const String& url, ExceptionState& exceptionState) 54 { 55 ASSERT(isMainThread()); 56 Document* document = toDocument(context); 57 UseCounter::count(context, UseCounter::WorkerStart); 58 if (!document->page()) { 59 exceptionState.throwDOMException(InvalidAccessError, "The context provided is invalid."); 60 return nullptr; 61 } 62 WorkerGlobalScopeProxyProvider* proxyProvider = WorkerGlobalScopeProxyProvider::from(*document->page()); 63 ASSERT(proxyProvider); 64 65 RefPtrWillBeRawPtr<Worker> worker = adoptRefWillBeRefCountedGarbageCollected(new Worker(context)); 66 67 worker->suspendIfNeeded(); 68 69 KURL scriptURL = worker->resolveURL(url, exceptionState); 70 if (scriptURL.isEmpty()) 71 return nullptr; 72 73 // The worker context does not exist while loading, so we must ensure that the worker object is not collected, nor are its event listeners. 74 worker->setPendingActivity(worker.get()); 75 76 worker->m_scriptLoader = WorkerScriptLoader::create(); 77 worker->m_scriptLoader->loadAsynchronously(*context, scriptURL, DenyCrossOriginRequests, worker.get()); 78 worker->m_contextProxy = proxyProvider->createWorkerGlobalScopeProxy(worker.get()); 79 return worker.release(); 80 } 81 82 Worker::~Worker() 83 { 84 ASSERT(isMainThread()); 85 ASSERT(executionContext()); // The context is protected by worker context proxy, so it cannot be destroyed while a Worker exists. 86 if (m_contextProxy) 87 m_contextProxy->workerObjectDestroyed(); 88 } 89 90 const AtomicString& Worker::interfaceName() const 91 { 92 return EventTargetNames::Worker; 93 } 94 95 void Worker::postMessage(PassRefPtr<SerializedScriptValue> message, const MessagePortArray* ports, ExceptionState& exceptionState) 96 { 97 // Disentangle the port in preparation for sending it to the remote context. 98 OwnPtr<MessagePortChannelArray> channels = MessagePort::disentanglePorts(ports, exceptionState); 99 if (exceptionState.hadException()) 100 return; 101 m_contextProxy->postMessageToWorkerGlobalScope(message, channels.release()); 102 } 103 104 void Worker::terminate() 105 { 106 if (m_contextProxy) 107 m_contextProxy->terminateWorkerGlobalScope(); 108 } 109 110 void Worker::stop() 111 { 112 terminate(); 113 } 114 115 bool Worker::hasPendingActivity() const 116 { 117 return m_contextProxy->hasPendingActivity() || ActiveDOMObject::hasPendingActivity(); 118 } 119 120 void Worker::didReceiveResponse(unsigned long identifier, const ResourceResponse&) 121 { 122 InspectorInstrumentation::didReceiveScriptResponse(executionContext(), identifier); 123 } 124 125 void Worker::notifyFinished() 126 { 127 if (m_scriptLoader->failed()) { 128 dispatchEvent(Event::createCancelable(EventTypeNames::error)); 129 } else { 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 unsetPendingActivity(this); 139 } 140 141 void Worker::trace(Visitor* visitor) 142 { 143 AbstractWorker::trace(visitor); 144 } 145 146 } // namespace WebCore 147