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/*
* 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 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
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "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 THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#if ENABLE(SHARED_WORKERS)
#include "DefaultSharedWorkerRepository.h"
#include "ActiveDOMObject.h"
#include "MessagePort.h"
#include "NotImplemented.h"
#include "PlatformString.h"
#include "SecurityOrigin.h"
#include "SecurityOriginHash.h"
#include "SharedWorker.h"
#include "SharedWorkerContext.h"
#include "SharedWorkerThread.h"
#include "WorkerLoaderProxy.h"
#include "WorkerScriptLoader.h"
#include "WorkerScriptLoaderClient.h"
#include <wtf/Threading.h>
namespace WebCore {
class SharedWorkerProxy : public ThreadSafeShared<SharedWorkerProxy>, public WorkerLoaderProxy {
public:
static PassRefPtr<SharedWorkerProxy> create(const String& name, const KURL& url) { return adoptRef(new SharedWorkerProxy(name, url)); }
void setThread(PassRefPtr<SharedWorkerThread> thread) { m_thread = thread; }
SharedWorkerThread* thread() { return m_thread.get(); }
bool closing() const { return m_closing; }
KURL url() const { return m_url.copy(); }
String name() const { return m_name.copy(); }
// WorkerLoaderProxy
// FIXME: Implement WorkerLoaderProxy APIs by proxying to an active document.
virtual void postTaskToLoader(PassRefPtr<ScriptExecutionContext::Task>) { notImplemented(); }
virtual void postTaskForModeToWorkerContext(PassRefPtr<ScriptExecutionContext::Task>, const String&) { notImplemented(); }
// Updates the list of the worker's documents, per section 4.5 of the WebWorkers spec.
void addToWorkerDocuments(ScriptExecutionContext*);
private:
SharedWorkerProxy(const String& name, const KURL&);
bool m_closing;
String m_name;
KURL m_url;
RefPtr<SharedWorkerThread> m_thread;
};
SharedWorkerProxy::SharedWorkerProxy(const String& name, const KURL& url)
: m_closing(false)
, m_name(name.copy())
, m_url(url.copy())
{
}
void SharedWorkerProxy::addToWorkerDocuments(ScriptExecutionContext* context)
{
// Nested workers are not yet supported, so passed-in context should always be a Document.
ASSERT(context->isDocument());
// FIXME: track referring documents so we can shutdown the thread when the last one exits and remove the proxy from the cache.
}
class SharedWorkerConnectTask : public ScriptExecutionContext::Task {
public:
static PassRefPtr<SharedWorkerConnectTask> create(PassOwnPtr<MessagePortChannel> channel)
{
return adoptRef(new SharedWorkerConnectTask(channel));
}
private:
SharedWorkerConnectTask(PassOwnPtr<MessagePortChannel> channel)
: m_channel(channel)
{
}
virtual void performTask(ScriptExecutionContext* scriptContext)
{
RefPtr<MessagePort> port = MessagePort::create(*scriptContext);
port->entangle(m_channel.release());
ASSERT(scriptContext->isWorkerContext());
WorkerContext* workerContext = static_cast<WorkerContext*>(scriptContext);
ASSERT(workerContext->isSharedWorkerContext());
workerContext->toSharedWorkerContext()->dispatchConnect(port);
}
OwnPtr<MessagePortChannel> m_channel;
};
// Loads the script on behalf of a worker.
class SharedWorkerScriptLoader : public RefCounted<SharedWorkerScriptLoader>, public ActiveDOMObject, private WorkerScriptLoaderClient {
public:
SharedWorkerScriptLoader(PassRefPtr<SharedWorker>, PassOwnPtr<MessagePortChannel>, PassRefPtr<SharedWorkerProxy>);
void load(const KURL&);
private:
// WorkerScriptLoaderClient callback
virtual void notifyFinished();
RefPtr<SharedWorker> m_worker;
OwnPtr<MessagePortChannel> m_port;
RefPtr<SharedWorkerProxy> m_proxy;
OwnPtr<WorkerScriptLoader> m_scriptLoader;
};
SharedWorkerScriptLoader::SharedWorkerScriptLoader(PassRefPtr<SharedWorker> worker, PassOwnPtr<MessagePortChannel> port, PassRefPtr<SharedWorkerProxy> proxy)
: ActiveDOMObject(worker->scriptExecutionContext(), this)
, m_worker(worker)
, m_port(port)
, m_proxy(proxy)
{
}
void SharedWorkerScriptLoader::load(const KURL& url)
{
// Mark this object as active for the duration of the load.
ASSERT(!hasPendingActivity());
m_scriptLoader = new WorkerScriptLoader();
m_scriptLoader->loadAsynchronously(scriptExecutionContext(), url, DenyCrossOriginRedirect, this);
// Stay alive until the load finishes.
setPendingActivity(this);
}
void SharedWorkerScriptLoader::notifyFinished()
{
// Hand off the just-loaded code to the repository to start up the worker thread.
if (m_scriptLoader->failed())
m_worker->dispatchLoadErrorEvent();
else
DefaultSharedWorkerRepository::instance().workerScriptLoaded(*m_proxy, scriptExecutionContext()->userAgent(m_scriptLoader->url()), m_scriptLoader->script(), m_port.release());
// This frees this object - must be the last action in this function.
unsetPendingActivity(this);
}
DefaultSharedWorkerRepository& DefaultSharedWorkerRepository::instance()
{
AtomicallyInitializedStatic(DefaultSharedWorkerRepository*, instance = new DefaultSharedWorkerRepository);
return *instance;
}
void DefaultSharedWorkerRepository::workerScriptLoaded(SharedWorkerProxy& proxy, const String& userAgent, const String& workerScript, PassOwnPtr<MessagePortChannel> port)
{
MutexLocker lock(m_lock);
if (proxy.closing())
return;
// Another loader may have already started up a thread for this proxy - if so, just send a connect to the pre-existing thread.
if (!proxy.thread()) {
RefPtr<SharedWorkerThread> thread = SharedWorkerThread::create(proxy.name(), proxy.url(), userAgent, workerScript, proxy);
proxy.setThread(thread);
thread->start();
}
proxy.thread()->runLoop().postTask(SharedWorkerConnectTask::create(port));
}
void SharedWorkerRepository::connect(PassRefPtr<SharedWorker> worker, PassOwnPtr<MessagePortChannel> port, const KURL& url, const String& name, ExceptionCode& ec)
{
DefaultSharedWorkerRepository::instance().connectToWorker(worker, port, url, name, ec);
}
void DefaultSharedWorkerRepository::connectToWorker(PassRefPtr<SharedWorker> worker, PassOwnPtr<MessagePortChannel> port, const KURL& url, const String& name, ExceptionCode& ec)
{
MutexLocker lock(m_lock);
ASSERT(worker->scriptExecutionContext()->securityOrigin()->canAccess(SecurityOrigin::create(url).get()));
// Fetch a proxy corresponding to this SharedWorker.
RefPtr<SharedWorkerProxy> proxy = getProxy(name, url);
proxy->addToWorkerDocuments(worker->scriptExecutionContext());
if (proxy->url() != url) {
// Proxy already existed under alternate URL - return an error.
ec = URL_MISMATCH_ERR;
return;
}
// If proxy is already running, just connect to it - otherwise, kick off a loader to load the script.
if (proxy->thread())
proxy->thread()->runLoop().postTask(SharedWorkerConnectTask::create(port));
else {
RefPtr<SharedWorkerScriptLoader> loader = adoptRef(new SharedWorkerScriptLoader(worker, port.release(), proxy.release()));
loader->load(url);
}
}
// Creates a new SharedWorkerProxy or returns an existing one from the repository. Must only be called while the repository mutex is held.
PassRefPtr<SharedWorkerProxy> DefaultSharedWorkerRepository::getProxy(const String& name, const KURL& url)
{
// Look for an existing worker, and create one if it doesn't exist.
// Items in the cache are freed on another thread, so copy the URL before creating the origin, to make sure no references to external strings linger.
RefPtr<SecurityOrigin> origin = SecurityOrigin::create(url.copy());
SharedWorkerNameMap* nameMap = m_cache.get(origin);
if (!nameMap) {
nameMap = new SharedWorkerNameMap();
m_cache.set(origin, nameMap);
}
RefPtr<SharedWorkerProxy> proxy = nameMap->get(name);
if (!proxy.get()) {
proxy = SharedWorkerProxy::create(name, url);
nameMap->set(proxy->name(), proxy);
}
return proxy;
}
DefaultSharedWorkerRepository::DefaultSharedWorkerRepository()
{
}
DefaultSharedWorkerRepository::~DefaultSharedWorkerRepository()
{
}
} // namespace WebCore
#endif // ENABLE(SHARED_WORKERS)
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