1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 // Provides wifi scan API binding for chromeos, using proprietary APIs.
7 #include "content/browser/geolocation/wifi_data_provider_chromeos.h"
10 #include "base/strings/utf_string_conversions.h"
11 #include "chromeos/network/geolocation_handler.h"
12 #include "content/browser/geolocation/wifi_data_provider_manager.h"
13 #include "content/public/browser/browser_thread.h"
19 // The time periods between successive polls of the wifi data.
20 const int kDefaultPollingIntervalMilliseconds = 10 * 1000; // 10s
21 const int kNoChangePollingIntervalMilliseconds = 2 * 60 * 1000; // 2 mins
22 const int kTwoNoChangePollingIntervalMilliseconds = 10 * 60 * 1000; // 10 mins
23 const int kNoWifiPollingIntervalMilliseconds = 20 * 1000; // 20s
27 WifiDataProviderChromeOs::WifiDataProviderChromeOs() : started_(false) {
30 WifiDataProviderChromeOs::~WifiDataProviderChromeOs() {
33 void WifiDataProviderChromeOs::StartDataProvider() {
34 DCHECK(CalledOnClientThread());
36 DCHECK(polling_policy_ == NULL);
37 polling_policy_.reset(
38 new GenericWifiPollingPolicy<kDefaultPollingIntervalMilliseconds,
39 kNoChangePollingIntervalMilliseconds,
40 kTwoNoChangePollingIntervalMilliseconds,
41 kNoWifiPollingIntervalMilliseconds>);
46 void WifiDataProviderChromeOs::StopDataProvider() {
47 DCHECK(CalledOnClientThread());
49 polling_policy_.reset();
53 bool WifiDataProviderChromeOs::GetData(WifiData* data) {
54 DCHECK(CalledOnClientThread());
57 return is_first_scan_complete_;
60 void WifiDataProviderChromeOs::DoStartTaskOnUIThread() {
61 CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
62 DoWifiScanTaskOnUIThread();
65 void WifiDataProviderChromeOs::DoWifiScanTaskOnUIThread() {
66 CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
68 // This method could be scheduled after a ScheduleStop.
74 if (GetAccessPointData(&new_data.access_point_data)) {
75 client_loop()->PostTask(
77 base::Bind(&WifiDataProviderChromeOs::DidWifiScanTask, this, new_data));
79 client_loop()->PostTask(
81 base::Bind(&WifiDataProviderChromeOs::DidWifiScanTaskNoResults, this));
85 void WifiDataProviderChromeOs::DidWifiScanTaskNoResults() {
86 DCHECK(CalledOnClientThread());
87 // Schedule next scan if started (StopDataProvider could have been called
88 // in between DoWifiScanTaskOnUIThread and this method).
90 ScheduleNextScan(polling_policy_->NoWifiInterval());
93 void WifiDataProviderChromeOs::DidWifiScanTask(const WifiData& new_data) {
94 DCHECK(CalledOnClientThread());
95 bool update_available = wifi_data_.DiffersSignificantly(new_data);
96 wifi_data_ = new_data;
97 // Schedule next scan if started (StopDataProvider could have been called
98 // in between DoWifiScanTaskOnUIThread and this method).
100 polling_policy_->UpdatePollingInterval(update_available);
101 ScheduleNextScan(polling_policy_->PollingInterval());
104 if (update_available || !is_first_scan_complete_) {
105 is_first_scan_complete_ = true;
110 void WifiDataProviderChromeOs::ScheduleNextScan(int interval) {
111 DCHECK(CalledOnClientThread());
113 BrowserThread::PostDelayedTask(
116 base::Bind(&WifiDataProviderChromeOs::DoWifiScanTaskOnUIThread, this),
117 base::TimeDelta::FromMilliseconds(interval));
120 void WifiDataProviderChromeOs::ScheduleStop() {
121 DCHECK(CalledOnClientThread());
126 void WifiDataProviderChromeOs::ScheduleStart() {
127 DCHECK(CalledOnClientThread());
130 // Perform first scan ASAP regardless of the polling policy. If this scan
131 // fails we'll retry at a rate in line with the polling policy.
132 BrowserThread::PostTask(
135 base::Bind(&WifiDataProviderChromeOs::DoStartTaskOnUIThread, this));
138 bool WifiDataProviderChromeOs::GetAccessPointData(
139 WifiData::AccessPointDataSet* result) {
140 // If wifi isn't enabled, we've effectively completed the task.
141 // Return true to indicate an empty access point list.
142 if (!chromeos::NetworkHandler::Get()->geolocation_handler()->wifi_enabled())
145 chromeos::WifiAccessPointVector access_points;
147 if (!chromeos::NetworkHandler::Get()->geolocation_handler()->
148 GetWifiAccessPoints(&access_points, &age_ms)) {
151 for (chromeos::WifiAccessPointVector::const_iterator i
152 = access_points.begin();
153 i != access_points.end(); ++i) {
154 AccessPointData ap_data;
155 ap_data.mac_address = base::ASCIIToUTF16(i->mac_address);
156 ap_data.radio_signal_strength = i->signal_strength;
157 ap_data.channel = i->channel;
158 ap_data.signal_to_noise = i->signal_to_noise;
159 ap_data.ssid = base::UTF8ToUTF16(i->ssid);
160 result->insert(ap_data);
162 // If the age is significantly longer than our long polling time, assume the
163 // data is stale and return false which will trigger a faster update.
164 if (age_ms > kTwoNoChangePollingIntervalMilliseconds * 2)
170 WifiDataProvider* WifiDataProviderManager::DefaultFactoryFunction() {
171 return new WifiDataProviderChromeOs();
174 } // namespace content