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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.
// Provides wifi scan API binding for chromeos, using proprietary APIs.
#include "chrome/browser/geolocation/wifi_data_provider_chromeos.h"
#include "base/utf_string_conversions.h"
#include "chrome/browser/chromeos/cros/cros_library.h"
#include "chrome/browser/chromeos/cros/network_library.h"
#include "content/browser/browser_thread.h"
namespace {
// The time periods between successive polls of the wifi data.
const int kDefaultPollingIntervalMilliseconds = 10 * 1000; // 10s
const int kNoChangePollingIntervalMilliseconds = 2 * 60 * 1000; // 2 mins
const int kTwoNoChangePollingIntervalMilliseconds = 10 * 60 * 1000; // 10 mins
const int kNoWifiPollingIntervalMilliseconds = 20 * 1000; // 20s
WifiDataProviderImplBase* ChromeOSFactoryFunction() {
return new WifiDataProviderChromeOs();
}
// This global class forces code that links in this file to use that as a data
// provider instead of the default Linux provider.
class RegisterChromeOSWifiDataProvider {
public:
RegisterChromeOSWifiDataProvider() {
WifiDataProvider::SetFactory(ChromeOSFactoryFunction);
}
};
RegisterChromeOSWifiDataProvider g_force_chrome_os_provider;
} // namespace
namespace chromeos {
namespace {
// Wifi API binding to network_library.h, to allow reuse of the polling behavior
// defined in WifiDataProviderCommon.
class NetworkLibraryWlanApi : public WifiDataProviderCommon::WlanApiInterface {
public:
// Does not transfer ownership, |lib| must remain valid for lifetime of
// this object.
explicit NetworkLibraryWlanApi(NetworkLibrary* lib);
~NetworkLibraryWlanApi();
// WifiDataProviderCommon::WlanApiInterface
bool GetAccessPointData(WifiData::AccessPointDataSet* data);
private:
NetworkLibrary* network_library_;
DISALLOW_COPY_AND_ASSIGN(NetworkLibraryWlanApi);
};
NetworkLibraryWlanApi::NetworkLibraryWlanApi(NetworkLibrary* lib)
: network_library_(lib) {
DCHECK(network_library_ != NULL);
}
NetworkLibraryWlanApi::~NetworkLibraryWlanApi() {
}
bool NetworkLibraryWlanApi::GetAccessPointData(
WifiData::AccessPointDataSet* result) {
WifiAccessPointVector access_points;
if (!network_library_->GetWifiAccessPoints(&access_points))
return false;
for (WifiAccessPointVector::const_iterator i = access_points.begin();
i != access_points.end(); ++i) {
AccessPointData ap_data;
ap_data.mac_address = ASCIIToUTF16(i->mac_address);
ap_data.radio_signal_strength = i->signal_strength;
ap_data.channel = i->channel;
ap_data.signal_to_noise = i->signal_to_noise;
ap_data.ssid = UTF8ToUTF16(i->name);
result->insert(ap_data);
}
return !result->empty() || network_library_->wifi_enabled();
}
} // namespace
} // namespace chromeos
WifiDataProviderChromeOs::WifiDataProviderChromeOs() : started_(false) {
}
WifiDataProviderChromeOs::~WifiDataProviderChromeOs() {
}
bool WifiDataProviderChromeOs::StartDataProvider() {
DCHECK(CalledOnClientThread());
DCHECK(polling_policy_ == NULL);
polling_policy_.reset(NewPollingPolicy());
DCHECK(polling_policy_ != NULL);
ScheduleStart();
return true;
}
void WifiDataProviderChromeOs::StopDataProvider() {
DCHECK(CalledOnClientThread());
polling_policy_.reset();
ScheduleStop();
}
bool WifiDataProviderChromeOs::GetData(WifiData* data) {
DCHECK(CalledOnClientThread());
DCHECK(data);
*data = wifi_data_;
return is_first_scan_complete_;
}
WifiDataProviderCommon::WlanApiInterface*
WifiDataProviderChromeOs::NewWlanApi(chromeos::NetworkLibrary* lib) {
return new chromeos::NetworkLibraryWlanApi(lib);
}
WifiDataProviderCommon::WlanApiInterface*
WifiDataProviderChromeOs::NewWlanApi() {
chromeos::CrosLibrary* cros_lib = chromeos::CrosLibrary::Get();
DCHECK(cros_lib);
if (!cros_lib->EnsureLoaded())
return NULL;
return NewWlanApi(cros_lib->GetNetworkLibrary());
}
PollingPolicyInterface* WifiDataProviderChromeOs::NewPollingPolicy() {
return new GenericPollingPolicy<kDefaultPollingIntervalMilliseconds,
kNoChangePollingIntervalMilliseconds,
kTwoNoChangePollingIntervalMilliseconds,
kNoWifiPollingIntervalMilliseconds>;
}
void WifiDataProviderChromeOs::DoStartTaskOnUIThread() {
CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
wlan_api_.reset(NewWlanApi());
if (wlan_api_ == NULL) {
client_loop()->PostTask(FROM_HERE, NewRunnableMethod(
this, &WifiDataProviderChromeOs::DidStartFailed));
return;
}
DoWifiScanTaskOnUIThread();
}
void WifiDataProviderChromeOs::DoStopTaskOnUIThread() {
CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
wlan_api_.reset();
}
void WifiDataProviderChromeOs::DidStartFailed() {
CHECK(CalledOnClientThread());
// Error! Can't do scans, so don't try and schedule one.
is_first_scan_complete_ = true;
}
void WifiDataProviderChromeOs::DoWifiScanTaskOnUIThread() {
CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
// This method could be scheduled after a DoStopTaskOnUIThread.
if (!wlan_api_.get())
return;
WifiData new_data;
if (!wlan_api_->GetAccessPointData(&new_data.access_point_data)) {
client_loop()->PostTask(FROM_HERE, NewRunnableMethod(
this, &WifiDataProviderChromeOs::DidWifiScanTaskNoResults));
} else {
client_loop()->PostTask(FROM_HERE, NewRunnableMethod(
this, &WifiDataProviderChromeOs::DidWifiScanTask,
new_data));
}
}
void WifiDataProviderChromeOs::DidWifiScanTaskNoResults() {
DCHECK(CalledOnClientThread());
// Schedule next scan if started (StopDataProvider could have been called
// in between DoWifiScanTaskOnUIThread and this method).
if (started_)
ScheduleNextScan(polling_policy_->NoWifiInterval());
MaybeNotifyListeners(false);
}
void WifiDataProviderChromeOs::DidWifiScanTask(const WifiData& new_data) {
DCHECK(CalledOnClientThread());
bool update_available = wifi_data_.DiffersSignificantly(new_data);
wifi_data_ = new_data;
// Schedule next scan if started (StopDataProvider could have been called
// in between DoWifiScanTaskOnUIThread and this method).
if (started_) {
polling_policy_->UpdatePollingInterval(update_available);
ScheduleNextScan(polling_policy_->PollingInterval());
}
MaybeNotifyListeners(update_available);
}
void WifiDataProviderChromeOs::MaybeNotifyListeners(bool update_available) {
if (update_available || !is_first_scan_complete_) {
is_first_scan_complete_ = true;
NotifyListeners();
}
}
void WifiDataProviderChromeOs::ScheduleNextScan(int interval) {
DCHECK(CalledOnClientThread());
DCHECK(started_);
BrowserThread::PostDelayedTask(
BrowserThread::UI,
FROM_HERE,
NewRunnableMethod(this,
&WifiDataProviderChromeOs::DoWifiScanTaskOnUIThread),
interval);
}
void WifiDataProviderChromeOs::ScheduleStop() {
DCHECK(CalledOnClientThread());
DCHECK(started_);
started_ = false;
BrowserThread::PostTask(
BrowserThread::UI,
FROM_HERE,
NewRunnableMethod(this,
&WifiDataProviderChromeOs::DoStopTaskOnUIThread));
}
void WifiDataProviderChromeOs::ScheduleStart() {
DCHECK(CalledOnClientThread());
DCHECK(!started_);
started_ = true;
// Perform first scan ASAP regardless of the polling policy. If this scan
// fails we'll retry at a rate in line with the polling policy.
BrowserThread::PostTask(
BrowserThread::UI,
FROM_HERE,
NewRunnableMethod(this,
&WifiDataProviderChromeOs::DoStartTaskOnUIThread));
}
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