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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/net/net_pref_observer.h"
#include "base/bind.h"
#include "base/task.h"
#include "chrome/browser/net/predictor.h"
#include "chrome/browser/prefs/pref_service.h"
#include "chrome/browser/prerender/prerender_manager.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/common/chrome_notification_types.h"
#include "chrome/common/pref_names.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/notification_details.h"
#include "net/http/http_stream_factory.h"
#include "net/url_request/url_request_throttler_manager.h"
using content::BrowserThread;
namespace {
// Callback function to call the set_enforce_throttling member on the
// URLRequestThrottlerManager singleton.
void SetEnforceThrottlingOnThrottlerManager(bool enforce) {
net::URLRequestThrottlerManager::GetInstance()->set_enforce_throttling(
enforce);
}
}
NetPrefObserver::NetPrefObserver(PrefService* prefs,
prerender::PrerenderManager* prerender_manager,
chrome_browser_net::Predictor* predictor)
: prerender_manager_(prerender_manager),
predictor_(predictor) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
DCHECK(prefs);
DCHECK(predictor);
network_prediction_enabled_.Init(prefs::kNetworkPredictionEnabled, prefs,
this);
spdy_disabled_.Init(prefs::kDisableSpdy, prefs, this);
http_throttling_enabled_.Init(prefs::kHttpThrottlingEnabled, prefs, this);
ApplySettings(NULL);
}
NetPrefObserver::~NetPrefObserver() {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
}
void NetPrefObserver::Observe(int type,
const content::NotificationSource& source,
const content::NotificationDetails& details) {
DCHECK_EQ(type, chrome::NOTIFICATION_PREF_CHANGED);
std::string* pref_name = content::Details<std::string>(details).ptr();
ApplySettings(pref_name);
}
void NetPrefObserver::ApplySettings(const std::string* pref_name) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
predictor_->EnablePredictor(*network_prediction_enabled_);
if (prerender_manager_)
prerender_manager_->set_enabled(*network_prediction_enabled_);
net::HttpStreamFactory::set_spdy_enabled(!*spdy_disabled_);
if (!pref_name || *pref_name == prefs::kHttpThrottlingEnabled) {
BrowserThread::PostTask(
BrowserThread::IO, FROM_HERE,
base::Bind(&SetEnforceThrottlingOnThrottlerManager,
*http_throttling_enabled_));
}
}
// static
void NetPrefObserver::RegisterPrefs(PrefService* prefs) {
prefs->RegisterBooleanPref(prefs::kNetworkPredictionEnabled,
true,
PrefService::SYNCABLE_PREF);
prefs->RegisterBooleanPref(prefs::kDisableSpdy,
false,
PrefService::UNSYNCABLE_PREF);
prefs->RegisterBooleanPref(prefs::kHttpThrottlingEnabled,
true,
PrefService::UNSYNCABLE_PREF);
// TODO(joi): This pref really means "user has not explicitly turned
// anti-DDoS throttling on or off". Rename it soon (2011/8/26) or
// remove it altogether (more likely).
prefs->RegisterBooleanPref(prefs::kHttpThrottlingMayExperiment,
true,
PrefService::UNSYNCABLE_PREF);
// For users who created their profile while throttling was off by
// default, but have never explicitly turned it on or off, we turn
// it on which is the new default.
if (prefs->GetBoolean(prefs::kHttpThrottlingMayExperiment)) {
prefs->SetBoolean(prefs::kHttpThrottlingEnabled, true);
}
}
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