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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 "chrome/common/chrome_features.h"
#include "chrome/common/pref_names.h"
#include "components/pref_registry/pref_registry_syncable.h"
#include "components/prefs/pref_service.h"
#include "content/public/browser/browser_thread.h"
#include "net/base/network_change_notifier.h"
namespace chrome_browser_net {
namespace {
// Since looking up preferences and current network connection are presumably
// both cheap, we do not cache them here.
NetworkPredictionStatus CanPrefetchAndPrerender(
int network_prediction_options) {
switch (network_prediction_options) {
case NETWORK_PREDICTION_ALWAYS:
case NETWORK_PREDICTION_WIFI_ONLY:
if (base::FeatureList::IsEnabled(
features::kPredictivePrefetchingAllowedOnAllConnectionTypes) ||
!net::NetworkChangeNotifier::IsConnectionCellular(
net::NetworkChangeNotifier::GetConnectionType())) {
return NetworkPredictionStatus::ENABLED;
}
return NetworkPredictionStatus::DISABLED_DUE_TO_NETWORK;
default:
DCHECK_EQ(NETWORK_PREDICTION_NEVER, network_prediction_options);
return NetworkPredictionStatus::DISABLED_ALWAYS;
}
}
bool CanPreresolveAndPreconnect(int network_prediction_options) {
// DNS preresolution and TCP preconnect are performed even on cellular
// networks if the user setting is WIFI_ONLY.
return network_prediction_options != NETWORK_PREDICTION_NEVER;
}
} // namespace
void RegisterPredictionOptionsProfilePrefs(
user_prefs::PrefRegistrySyncable* registry) {
registry->RegisterIntegerPref(
prefs::kNetworkPredictionOptions,
NETWORK_PREDICTION_DEFAULT,
user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
}
NetworkPredictionStatus CanPrefetchAndPrerenderUI(PrefService* prefs) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
DCHECK(prefs);
return CanPrefetchAndPrerender(
prefs->GetInteger(prefs::kNetworkPredictionOptions));
}
bool CanPreresolveAndPreconnectUI(PrefService* prefs) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
DCHECK(prefs);
return CanPreresolveAndPreconnect(
prefs->GetInteger(prefs::kNetworkPredictionOptions));
}
} // namespace chrome_browser_net
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