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// Copyright (c) 2011 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/web_resource_service.h"
#include "base/bind.h"
#include "base/command_line.h"
#include "base/string_number_conversions.h"
#include "base/string_util.h"
#include "base/time.h"
#include "base/utf_string_conversions.h"
#include "base/values.h"
#include "chrome/browser/browser_process.h"
#include "chrome/browser/prefs/pref_service.h"
#include "chrome/common/chrome_switches.h"
#include "chrome/common/chrome_utility_messages.h"
#include "chrome/common/web_resource/web_resource_unpacker.h"
#include "content/browser/renderer_host/resource_dispatcher_host.h"
#include "content/browser/utility_process_host.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/common/url_fetcher.h"
#include "googleurl/src/gurl.h"
#include "net/base/load_flags.h"
#include "net/url_request/url_request_status.h"
using content::BrowserThread;
// 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 WebResourceService::UnpackerClient : public UtilityProcessHost::Client {
public:
explicit UnpackerClient(WebResourceService* web_resource_service)
: web_resource_service_(web_resource_service),
resource_dispatcher_host_(ResourceDispatcherHost::Get()),
got_response_(false) {
}
void Start(const std::string& json_data) {
AddRef(); // balanced in Cleanup.
// TODO(willchan): Look for a better signal of whether we're in a unit test
// or not. Using |resource_dispatcher_host_| for this is pretty lame.
// If we don't have a resource_dispatcher_host_, assume we're in
// a test and run the unpacker directly in-process.
bool use_utility_process =
resource_dispatcher_host_ != NULL &&
!CommandLine::ForCurrentProcess()->HasSwitch(switches::kSingleProcess);
if (use_utility_process) {
BrowserThread::ID thread_id;
CHECK(BrowserThread::GetCurrentThreadIdentifier(&thread_id));
BrowserThread::PostTask(
BrowserThread::IO, FROM_HERE,
base::Bind(&UnpackerClient::StartProcessOnIOThread,
this, thread_id, json_data));
} else {
WebResourceUnpacker unpacker(json_data);
if (unpacker.Run()) {
OnUnpackWebResourceSucceeded(*unpacker.parsed_json());
} else {
OnUnpackWebResourceFailed(unpacker.error_message());
}
}
}
private:
virtual ~UnpackerClient() {}
// UtilityProcessHost::Client
virtual bool OnMessageReceived(const IPC::Message& message) {
bool handled = true;
IPC_BEGIN_MESSAGE_MAP(WebResourceService::UnpackerClient, 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) {
if (got_response_)
return;
OnUnpackWebResourceFailed(
"Utility process crashed while trying to retrieve web resources.");
}
void OnUnpackWebResourceSucceeded(
const DictionaryValue& parsed_json) {
web_resource_service_->Unpack(parsed_json);
Cleanup();
}
void OnUnpackWebResourceFailed(const std::string& error_message) {
LOG(ERROR) << error_message;
Cleanup();
}
// Release reference and set got_response_.
void Cleanup() {
DCHECK(!got_response_);
got_response_ = true;
web_resource_service_->EndFetch();
Release();
}
void StartProcessOnIOThread(BrowserThread::ID thread_id,
const std::string& json_data) {
UtilityProcessHost* host = new UtilityProcessHost(this, thread_id);
host->set_use_linux_zygote(true);
// TODO(mrc): get proper file path when we start using web resources
// that need to be unpacked.
host->Send(new ChromeUtilityMsg_UnpackWebResource(json_data));
}
scoped_refptr<WebResourceService> web_resource_service_;
// Owned by the global browser process.
ResourceDispatcherHost* resource_dispatcher_host_;
// True if we got a response from the utility process and have cleaned up
// already.
bool got_response_;
};
WebResourceService::WebResourceService(
PrefService* prefs,
const char* web_resource_server,
bool apply_locale_to_url,
const char* last_update_time_pref_name,
int start_fetch_delay_ms,
int cache_update_delay_ms)
: prefs_(prefs),
ALLOW_THIS_IN_INITIALIZER_LIST(weak_ptr_factory_(this)),
in_fetch_(false),
web_resource_server_(web_resource_server),
apply_locale_to_url_(apply_locale_to_url),
last_update_time_pref_name_(last_update_time_pref_name),
start_fetch_delay_ms_(start_fetch_delay_ms),
cache_update_delay_ms_(cache_update_delay_ms) {
DCHECK(prefs);
}
WebResourceService::~WebResourceService() { }
void WebResourceService::EndFetch() {
in_fetch_ = false;
}
void WebResourceService::StartAfterDelay() {
int64 delay = start_fetch_delay_ms_;
// Check whether we have ever put a value in the web resource cache;
// if so, pull it out and see if it's time to update again.
if (prefs_->HasPrefPath(last_update_time_pref_name_)) {
std::string last_update_pref =
prefs_->GetString(last_update_time_pref_name_);
if (!last_update_pref.empty()) {
double last_update_value;
base::StringToDouble(last_update_pref, &last_update_value);
int64 ms_until_update = cache_update_delay_ms_ -
static_cast<int64>((base::Time::Now() - base::Time::FromDoubleT(
last_update_value)).InMilliseconds());
// Wait at least |start_fetch_delay_ms_|.
if (ms_until_update > start_fetch_delay_ms_)
delay = ms_until_update;
}
}
// Start fetch and wait for UpdateResourceCache.
ScheduleFetch(delay);
}
// Delay initial load of resource data into cache so as not to interfere
// with startup time.
void WebResourceService::ScheduleFetch(int64 delay_ms) {
MessageLoop::current()->PostDelayedTask(
FROM_HERE,
base::Bind(&WebResourceService::StartFetch,
weak_ptr_factory_.GetWeakPtr()),
delay_ms);
}
// Initializes the fetching of data from the resource server. Data
// load calls OnURLFetchComplete.
void WebResourceService::StartFetch() {
// First, put our next cache load on the MessageLoop.
ScheduleFetch(cache_update_delay_ms_);
// Set cache update time in preferences.
prefs_->SetString(last_update_time_pref_name_,
base::DoubleToString(base::Time::Now().ToDoubleT()));
// If we are still fetching data, exit.
if (in_fetch_)
return;
in_fetch_ = true;
// Balanced in OnURLFetchComplete.
AddRef();
std::string web_resource_server = web_resource_server_;
if (apply_locale_to_url_) {
std::string locale = g_browser_process->GetApplicationLocale();
web_resource_server.append(locale);
}
url_fetcher_.reset(content::URLFetcher::Create(
GURL(web_resource_server), content::URLFetcher::GET, this));
// Do not let url fetcher affect existing state in system context
// (by setting cookies, for example).
url_fetcher_->SetLoadFlags(net::LOAD_DISABLE_CACHE |
net::LOAD_DO_NOT_SAVE_COOKIES);
net::URLRequestContextGetter* url_request_context_getter =
g_browser_process->system_request_context();
url_fetcher_->SetRequestContext(url_request_context_getter);
url_fetcher_->Start();
}
void WebResourceService::OnURLFetchComplete(const content::URLFetcher* source) {
// Delete the URLFetcher when this function exits.
scoped_ptr<content::URLFetcher> clean_up_fetcher(url_fetcher_.release());
// Don't parse data if attempt to download was unsuccessful.
// Stop loading new web resource data, and silently exit.
if (!source->GetStatus().is_success() || (source->GetResponseCode() != 200))
return;
std::string data;
source->GetResponseAsString(&data);
// UnpackerClient releases itself.
UnpackerClient* client = new UnpackerClient(this);
client->Start(data);
Release();
}
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