/*

 * Copyright (C) 2009, 2010 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

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 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

#include "config.h"

#if ENABLE(WORKERS)

#include "WorkerThreadableLoader.h"

#include "CrossThreadTask.h"

#include "ResourceError.h"

#include "ResourceRequest.h"

#include "ResourceResponse.h"

#include "ThreadableLoader.h"

#include "WorkerContext.h"

#include "WorkerLoaderProxy.h"

#include "WorkerThread.h"

#include <wtf/OwnPtr.h>

#include <wtf/Threading.h>

#include <wtf/Vector.h>

using namespace std;

namespace WebCore {

static const char loadResourceSynchronouslyMode[] = "loadResourceSynchronouslyMode";

WorkerThreadableLoader::WorkerThreadableLoader(WorkerContext* workerContext, ThreadableLoaderClient* client, const String& taskMode, const ResourceRequest& request, const ThreadableLoaderOptions& options)

    : m_workerContext(workerContext)

    , m_workerClientWrapper(ThreadableLoaderClientWrapper::create(client))

    , m_bridge(*(new MainThreadBridge(m_workerClientWrapper, m_workerContext->thread()->workerLoaderProxy(), taskMode, request, options)))

{

}

WorkerThreadableLoader::~WorkerThreadableLoader()

{

    m_bridge.destroy();

}

void WorkerThreadableLoader::loadResourceSynchronously(WorkerContext* workerContext, const ResourceRequest& request, ThreadableLoaderClient& client, const ThreadableLoaderOptions& options)

{

    WorkerRunLoop& runLoop = workerContext->thread()->runLoop();

    // Create a unique mode just for this synchronous resource load.

    String mode = loadResourceSynchronouslyMode;

    mode.append(String::number(runLoop.createUniqueId()));

    RefPtr<WorkerThreadableLoader> loader = WorkerThreadableLoader::create(workerContext, &client, mode, request, options);

    MessageQueueWaitResult result = MessageQueueMessageReceived;

    while (!loader->done() && result != MessageQueueTerminated)

        result = runLoop.runInMode(workerContext, mode);

    if (!loader->done() && result == MessageQueueTerminated)

        loader->cancel();

}

void WorkerThreadableLoader::cancel()

{

    m_bridge.cancel();

}

WorkerThreadableLoader::MainThreadBridge::MainThreadBridge(PassRefPtr<ThreadableLoaderClientWrapper> workerClientWrapper, WorkerLoaderProxy& loaderProxy, const String& taskMode,

                                                           const ResourceRequest& request, const ThreadableLoaderOptions& options)

    : m_workerClientWrapper(workerClientWrapper)

    , m_loaderProxy(loaderProxy)

    , m_taskMode(taskMode.crossThreadString())

{

    ASSERT(m_workerClientWrapper.get());

    m_loaderProxy.postTaskToLoader(createCallbackTask(&MainThreadBridge::mainThreadCreateLoader, this, request, options));

}

WorkerThreadableLoader::MainThreadBridge::~MainThreadBridge()

{

}

void WorkerThreadableLoader::MainThreadBridge::mainThreadCreateLoader(ScriptExecutionContext* context, MainThreadBridge* thisPtr, PassOwnPtr<CrossThreadResourceRequestData> requestData, ThreadableLoaderOptions options)

{

    ASSERT(isMainThread());

    ASSERT(context->isDocument());

    // FIXME: the created loader has no knowledge of the origin of the worker doing the load request.

    // Basically every setting done in SubresourceLoader::create (including the contents of addExtraFieldsToRequest)

    // needs to be examined for how it should take into account a different originator.

    OwnPtr<ResourceRequest> request(ResourceRequest::adopt(requestData));

    // FIXME: If the a site requests a local resource, then this will return a non-zero value but the sync path

    // will return a 0 value.  Either this should return 0 or the other code path should do a callback with

    // a failure.

    thisPtr->m_mainThreadLoader = ThreadableLoader::create(context, thisPtr, *request, options);

    ASSERT(thisPtr->m_mainThreadLoader);

}

void WorkerThreadableLoader::MainThreadBridge::mainThreadDestroy(ScriptExecutionContext* context, MainThreadBridge* thisPtr)

{

    ASSERT(isMainThread());

    ASSERT_UNUSED(context, context->isDocument());

    delete thisPtr;

}

void WorkerThreadableLoader::MainThreadBridge::destroy()

{

    // Ensure that no more client callbacks are done in the worker context's thread.

    clearClientWrapper();

    // "delete this" and m_mainThreadLoader::deref() on the worker object's thread.

    m_loaderProxy.postTaskToLoader(createCallbackTask(&MainThreadBridge::mainThreadDestroy, this));

}

void WorkerThreadableLoader::MainThreadBridge::mainThreadCancel(ScriptExecutionContext* context, MainThreadBridge* thisPtr)

{

    ASSERT(isMainThread());

    ASSERT_UNUSED(context, context->isDocument());

    if (!thisPtr->m_mainThreadLoader)

        return;

    thisPtr->m_mainThreadLoader->cancel();

    thisPtr->m_mainThreadLoader = 0;

}

void WorkerThreadableLoader::MainThreadBridge::cancel()

{

    m_loaderProxy.postTaskToLoader(createCallbackTask(&MainThreadBridge::mainThreadCancel, this));

    ThreadableLoaderClientWrapper* clientWrapper = m_workerClientWrapper.get();

    if (!clientWrapper->done()) {

        // If the client hasn't reached a termination state, then transition it by sending a cancellation error.

        // Note: no more client callbacks will be done after this method -- the clearClientWrapper() call ensures that.

        ResourceError error(String(), 0, String(), String());

        error.setIsCancellation(true);

        clientWrapper->didFail(error);

    }

    clearClientWrapper();

}

void WorkerThreadableLoader::MainThreadBridge::clearClientWrapper()

{

    m_workerClientWrapper->clearClient();

}

static void workerContextDidSendData(ScriptExecutionContext* context, RefPtr<ThreadableLoaderClientWrapper> workerClientWrapper, unsigned long long bytesSent, unsigned long long totalBytesToBeSent)

{

    ASSERT_UNUSED(context, context->isWorkerContext());

    workerClientWrapper->didSendData(bytesSent, totalBytesToBeSent);

}

void WorkerThreadableLoader::MainThreadBridge::didSendData(unsigned long long bytesSent, unsigned long long totalBytesToBeSent)

{

    m_loaderProxy.postTaskForModeToWorkerContext(createCallbackTask(&workerContextDidSendData, m_workerClientWrapper, bytesSent, totalBytesToBeSent), m_taskMode);

}

static void workerContextDidReceiveResponse(ScriptExecutionContext* context, RefPtr<ThreadableLoaderClientWrapper> workerClientWrapper, PassOwnPtr<CrossThreadResourceResponseData> responseData)

{

    ASSERT_UNUSED(context, context->isWorkerContext());

    OwnPtr<ResourceResponse> response(ResourceResponse::adopt(responseData));

    workerClientWrapper->didReceiveResponse(*response);

}

void WorkerThreadableLoader::MainThreadBridge::didReceiveResponse(const ResourceResponse& response)

{

    m_loaderProxy.postTaskForModeToWorkerContext(createCallbackTask(&workerContextDidReceiveResponse, m_workerClientWrapper, response), m_taskMode);

}

static void workerContextDidReceiveData(ScriptExecutionContext* context, RefPtr<ThreadableLoaderClientWrapper> workerClientWrapper, PassOwnPtr<Vector<char> > vectorData)

{

    ASSERT_UNUSED(context, context->isWorkerContext());

    workerClientWrapper->didReceiveData(vectorData->data(), vectorData->size());

}

void WorkerThreadableLoader::MainThreadBridge::didReceiveData(const char* data, int lengthReceived)

{

    OwnPtr<Vector<char> > vector(new Vector<char>(lengthReceived)); // needs to be an OwnPtr for usage with createCallbackTask.

    memcpy(vector->data(), data, lengthReceived);

    m_loaderProxy.postTaskForModeToWorkerContext(createCallbackTask(&workerContextDidReceiveData, m_workerClientWrapper, vector.release()), m_taskMode);

}

static void workerContextDidFinishLoading(ScriptExecutionContext* context, RefPtr<ThreadableLoaderClientWrapper> workerClientWrapper, unsigned long identifier)

{

    ASSERT_UNUSED(context, context->isWorkerContext());

    workerClientWrapper->didFinishLoading(identifier);

}

void WorkerThreadableLoader::MainThreadBridge::didFinishLoading(unsigned long identifier)

{

    m_loaderProxy.postTaskForModeToWorkerContext(createCallbackTask(&workerContextDidFinishLoading, m_workerClientWrapper, identifier), m_taskMode);

}

static void workerContextDidFail(ScriptExecutionContext* context, RefPtr<ThreadableLoaderClientWrapper> workerClientWrapper, const ResourceError& error)

{

    ASSERT_UNUSED(context, context->isWorkerContext());

    workerClientWrapper->didFail(error);

}

void WorkerThreadableLoader::MainThreadBridge::didFail(const ResourceError& error)

{

    m_loaderProxy.postTaskForModeToWorkerContext(createCallbackTask(&workerContextDidFail, m_workerClientWrapper, error), m_taskMode);

}

static void workerContextDidFailRedirectCheck(ScriptExecutionContext* context, RefPtr<ThreadableLoaderClientWrapper> workerClientWrapper)

{

    ASSERT_UNUSED(context, context->isWorkerContext());

    workerClientWrapper->didFailRedirectCheck();

}

void WorkerThreadableLoader::MainThreadBridge::didFailRedirectCheck()

{

    m_loaderProxy.postTaskForModeToWorkerContext(createCallbackTask(&workerContextDidFailRedirectCheck, m_workerClientWrapper), m_taskMode);

}

static void workerContextDidReceiveAuthenticationCancellation(ScriptExecutionContext* context, RefPtr<ThreadableLoaderClientWrapper> workerClientWrapper, PassOwnPtr<CrossThreadResourceResponseData> responseData)

{

    ASSERT_UNUSED(context, context->isWorkerContext());

    OwnPtr<ResourceResponse> response(ResourceResponse::adopt(responseData));

    workerClientWrapper->didReceiveAuthenticationCancellation(*response);

}

void WorkerThreadableLoader::MainThreadBridge::didReceiveAuthenticationCancellation(const ResourceResponse& response)

{

    m_loaderProxy.postTaskForModeToWorkerContext(createCallbackTask(&workerContextDidReceiveAuthenticationCancellation, m_workerClientWrapper, response), m_taskMode);

}

} // namespace WebCore

#endif // ENABLE(WORKERS)