Source/core/workers/Worker.cpp

/*
 * Copyright (C) 2008, 2010 Apple Inc. All Rights Reserved.
 * Copyright (C) 2009 Google Inc. All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``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 APPLE COMPUTER, INC. OR
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#include "config.h"
#include "core/workers/Worker.h"

#include "bindings/core/v8/ExceptionState.h"
#include "core/dom/Document.h"
#include "core/dom/ExceptionCode.h"
#include "core/events/MessageEvent.h"
#include "core/fetch/ResourceFetcher.h"
#include "core/inspector/InspectorInstrumentation.h"
#include "core/frame/LocalDOMWindow.h"
#include "core/frame/UseCounter.h"
#include "core/workers/WorkerGlobalScopeProxy.h"
#include "core/workers/WorkerGlobalScopeProxyProvider.h"
#include "core/workers/WorkerScriptLoader.h"
#include "core/workers/WorkerThread.h"
#include "wtf/MainThread.h"

namespace blink {

inline Worker::Worker(ExecutionContext* context)
    : AbstractWorker(context)
    , m_contextProxy(nullptr)
{
}

PassRefPtrWillBeRawPtr<Worker> Worker::create(ExecutionContext* context, const String& url, ExceptionState& exceptionState)
{
    ASSERT(isMainThread());
    Document* document = toDocument(context);
    UseCounter::count(context, UseCounter::WorkerStart);
    if (!document->page()) {
        exceptionState.throwDOMException(InvalidAccessError, "The context provided is invalid.");
        return nullptr;
    }
    WorkerGlobalScopeProxyProvider* proxyProvider = WorkerGlobalScopeProxyProvider::from(*document->page());
    ASSERT(proxyProvider);

    RefPtrWillBeRawPtr<Worker> worker = adoptRefWillBeNoop(new Worker(context));

    worker->suspendIfNeeded();

    KURL scriptURL = worker->resolveURL(url, exceptionState);
    if (scriptURL.isEmpty())
        return nullptr;

    worker->m_scriptLoader = WorkerScriptLoader::create();
    worker->m_scriptLoader->loadAsynchronously(*context, scriptURL, DenyCrossOriginRequests, worker.get());
    worker->m_contextProxy = proxyProvider->createWorkerGlobalScopeProxy(worker.get());
    return worker.release();
}

Worker::~Worker()
{
    ASSERT(isMainThread());
    if (!m_contextProxy)
        return;
    m_contextProxy->workerObjectDestroyed();
}

const AtomicString& Worker::interfaceName() const
{
    return EventTargetNames::Worker;
}

void Worker::postMessage(ExecutionContext*, PassRefPtr<SerializedScriptValue> message, const MessagePortArray* ports, ExceptionState& exceptionState)
{
    ASSERT(m_contextProxy);
    // Disentangle the port in preparation for sending it to the remote context.
    OwnPtr<MessagePortChannelArray> channels = MessagePort::disentanglePorts(ports, exceptionState);
    if (exceptionState.hadException())
        return;
    m_contextProxy->postMessageToWorkerGlobalScope(message, channels.release());
}

void Worker::terminate()
{
    if (m_contextProxy)
        m_contextProxy->terminateWorkerGlobalScope();
}

void Worker::stop()
{
    terminate();
}

bool Worker::hasPendingActivity() const
{
    // The worker context does not exist while loading, so we must ensure that the worker object is not collected, nor are its event listeners.
    return (m_contextProxy && m_contextProxy->hasPendingActivity()) || m_scriptLoader;
}

void Worker::didReceiveResponse(unsigned long identifier, const ResourceResponse&)
{
    InspectorInstrumentation::didReceiveScriptResponse(executionContext(), identifier);
}

void Worker::notifyFinished()
{
    if (m_scriptLoader->failed()) {
        dispatchEvent(Event::createCancelable(EventTypeNames::error));
    } else {
        ASSERT(m_contextProxy);
        WorkerThreadStartMode startMode = DontPauseWorkerGlobalScopeOnStart;
        if (InspectorInstrumentation::shouldPauseDedicatedWorkerOnStart(executionContext()))
            startMode = PauseWorkerGlobalScopeOnStart;
        m_contextProxy->startWorkerGlobalScope(m_scriptLoader->url(), executionContext()->userAgent(m_scriptLoader->url()), m_scriptLoader->script(), startMode);
        InspectorInstrumentation::scriptImported(executionContext(), m_scriptLoader->identifier(), m_scriptLoader->script());
    }
    m_scriptLoader = nullptr;
}

DEFINE_TRACE(Worker)
{
    AbstractWorker::trace(visitor);
}

} // namespace blink