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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/web_resource/json_asynchronous_unpacker.h"
#include "base/command_line.h"
#include "chrome/browser/web_resource/web_resource_service.h"
#include "chrome/common/chrome_switches.h"
#include "chrome/common/chrome_utility_messages.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/utility_process_host.h"
#include "content/public/browser/utility_process_host_client.h"
using content::BrowserThread;
using content::UtilityProcessHost;
using content::UtilityProcessHostClient;
// This class coordinates a web resource unpack and parse task which is run in
// a separate process. Results are sent back to this class and routed to
// the WebResourceService.
class JSONAsynchronousUnpackerImpl
: public UtilityProcessHostClient,
public JSONAsynchronousUnpacker {
public:
explicit JSONAsynchronousUnpackerImpl(
JSONAsynchronousUnpackerDelegate* delegate)
: JSONAsynchronousUnpacker(delegate),
got_response_(false) {
}
virtual void Start(const std::string& json_data) OVERRIDE {
AddRef(); // balanced in Cleanup.
BrowserThread::ID thread_id;
CHECK(BrowserThread::GetCurrentThreadIdentifier(&thread_id));
BrowserThread::PostTask(
BrowserThread::IO, FROM_HERE,
base::Bind(
&JSONAsynchronousUnpackerImpl::StartProcessOnIOThread,
this, thread_id, json_data));
}
private:
virtual ~JSONAsynchronousUnpackerImpl() {}
// UtilityProcessHostClient.
virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE {
bool handled = true;
IPC_BEGIN_MESSAGE_MAP(JSONAsynchronousUnpackerImpl, message)
IPC_MESSAGE_HANDLER(ChromeUtilityHostMsg_UnpackWebResource_Succeeded,
OnUnpackWebResourceSucceeded)
IPC_MESSAGE_HANDLER(ChromeUtilityHostMsg_UnpackWebResource_Failed,
OnUnpackWebResourceFailed)
IPC_MESSAGE_UNHANDLED(handled = false)
IPC_END_MESSAGE_MAP()
return handled;
}
virtual void OnProcessCrashed(int exit_code) OVERRIDE {
if (got_response_)
return;
OnUnpackWebResourceFailed(
"Utility process crashed while trying to retrieve web resources.");
}
void OnUnpackWebResourceSucceeded(
const base::DictionaryValue& parsed_json) {
if (delegate_)
delegate_->OnUnpackFinished(parsed_json);
Cleanup();
}
void OnUnpackWebResourceFailed(const std::string& error_message) {
if (delegate_)
delegate_->OnUnpackError(error_message);
Cleanup();
}
// Release reference and set got_response_.
void Cleanup() {
DCHECK(!got_response_);
got_response_ = true;
Release();
}
void StartProcessOnIOThread(BrowserThread::ID thread_id,
const std::string& json_data) {
UtilityProcessHost* host = UtilityProcessHost::Create(
this, BrowserThread::GetMessageLoopProxyForThread(thread_id).get());
// TODO(mrc): get proper file path when we start using web resources
// that need to be unpacked.
host->Send(new ChromeUtilityMsg_UnpackWebResource(json_data));
}
// True if we got a response from the utility process and have cleaned up
// already.
bool got_response_;
};
JSONAsynchronousUnpacker* JSONAsynchronousUnpacker::Create(
JSONAsynchronousUnpackerDelegate* delegate) {
return new JSONAsynchronousUnpackerImpl(delegate);
}
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