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// Copyright 2014 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/prediction_options.h"
#include "base/logging.h"
#include "base/prefs/pref_service.h"
#include "chrome/browser/profiles/profile_io_data.h"
#include "chrome/common/pref_names.h"
#include "components/pref_registry/pref_registry_syncable.h"
#include "content/public/browser/browser_thread.h"
#include "net/base/network_change_notifier.h"
namespace {
// Since looking up preferences and current network connection are presumably
// both cheap, we do not cache them here.
bool CanPrefetchAndPrerender(int network_prediction_options,
bool network_prediction_enabled) {
switch (network_prediction_options) {
case chrome_browser_net::NETWORK_PREDICTION_ALWAYS:
return true;
case chrome_browser_net::NETWORK_PREDICTION_WIFI_ONLY:
return !net::NetworkChangeNotifier::IsConnectionCellular(
net::NetworkChangeNotifier::GetConnectionType());
case chrome_browser_net::NETWORK_PREDICTION_NEVER:
return false;
case chrome_browser_net::NETWORK_PREDICTION_UNSET:
return network_prediction_enabled;
default:
NOTREACHED() << "Unknown kNetworkPredictionOptions value.";
return false;
}
}
bool CanPreresolveAndPreconnect(int network_prediction_options,
bool network_prediction_enabled) {
switch (network_prediction_options) {
case chrome_browser_net::NETWORK_PREDICTION_ALWAYS:
return true;
// DNS preresolution and TCP preconnect are performed even on cellular
// networks if the user setting is WIFI_ONLY.
case chrome_browser_net::NETWORK_PREDICTION_WIFI_ONLY:
return true;
case chrome_browser_net::NETWORK_PREDICTION_NEVER:
return false;
case chrome_browser_net::NETWORK_PREDICTION_UNSET:
return network_prediction_enabled;
default:
NOTREACHED() << "Unknown kNetworkPredictionOptions value.";
return false;
}
}
} // namespace
namespace chrome_browser_net {
void RegisterPredictionOptionsProfilePrefs(
user_prefs::PrefRegistrySyncable* registry) {
registry->RegisterIntegerPref(
prefs::kNetworkPredictionOptions,
chrome_browser_net::NETWORK_PREDICTION_UNSET,
user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
}
void MigrateNetworkPredictionUserPrefs(PrefService* pref_service) {
// Nothing to do if the user or this migration code has already set the new
// preference.
if (pref_service->GetUserPrefValue(prefs::kNetworkPredictionOptions))
return;
// Nothing to do if the user has not set the old preference.
const base::Value* network_prediction_enabled =
pref_service->GetUserPrefValue(prefs::kNetworkPredictionEnabled);
if (!network_prediction_enabled)
return;
bool value = false;
if (network_prediction_enabled->GetAsBoolean(&value)) {
pref_service->SetInteger(
prefs::kNetworkPredictionOptions,
value ? chrome_browser_net::NETWORK_PREDICTION_WIFI_ONLY
: chrome_browser_net::NETWORK_PREDICTION_NEVER);
}
}
bool CanPrefetchAndPrerenderIO(ProfileIOData* profile_io_data) {
DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::IO));
DCHECK(profile_io_data);
return CanPrefetchAndPrerender(
profile_io_data->network_prediction_options()->GetValue(),
profile_io_data->network_prediction_enabled()->GetValue());
}
bool CanPrefetchAndPrerenderUI(PrefService* prefs) {
DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
DCHECK(prefs);
return CanPrefetchAndPrerender(
prefs->GetInteger(prefs::kNetworkPredictionOptions),
prefs->GetBoolean(prefs::kNetworkPredictionEnabled));
}
bool CanPredictNetworkActionsUI(PrefService* prefs) {
return CanPrefetchAndPrerenderUI(prefs);
}
bool CanPreresolveAndPreconnectIO(ProfileIOData* profile_io_data) {
DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::IO));
DCHECK(profile_io_data);
return CanPreresolveAndPreconnect(
profile_io_data->network_prediction_options()->GetValue(),
profile_io_data->network_prediction_enabled()->GetValue());
}
bool CanPreresolveAndPreconnectUI(PrefService* prefs) {
DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
DCHECK(prefs);
return CanPreresolveAndPreconnect(
prefs->GetInteger(prefs::kNetworkPredictionOptions),
prefs->GetBoolean(prefs::kNetworkPredictionEnabled));
}
} // namespace chrome_browser_net
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