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// Copyright (c) 2012 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 "content/browser/geolocation/wifi_data_provider_chromeos.h"
#include "base/bind.h"
#include "base/strings/utf_string_conversions.h"
#include "chromeos/network/geolocation_handler.h"
#include "content/browser/geolocation/wifi_data_provider_manager.h"
#include "content/public/browser/browser_thread.h"
namespace content {
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
} // namespace
WifiDataProviderChromeOs::WifiDataProviderChromeOs()
: started_(false), is_first_scan_complete_(false) {
}
WifiDataProviderChromeOs::~WifiDataProviderChromeOs() {
}
void WifiDataProviderChromeOs::StartDataProvider() {
DCHECK(CalledOnClientThread());
DCHECK(polling_policy_ == NULL);
polling_policy_.reset(
new GenericWifiPollingPolicy<kDefaultPollingIntervalMilliseconds,
kNoChangePollingIntervalMilliseconds,
kTwoNoChangePollingIntervalMilliseconds,
kNoWifiPollingIntervalMilliseconds>);
ScheduleStart();
}
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_;
}
void WifiDataProviderChromeOs::DoStartTaskOnUIThread() {
CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
DoWifiScanTaskOnUIThread();
}
void WifiDataProviderChromeOs::DoWifiScanTaskOnUIThread() {
CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
// This method could be scheduled after a ScheduleStop.
if (!started_)
return;
WifiData new_data;
if (GetAccessPointData(&new_data.access_point_data)) {
client_loop()->PostTask(
FROM_HERE,
base::Bind(&WifiDataProviderChromeOs::DidWifiScanTask, this, new_data));
} else {
client_loop()->PostTask(
FROM_HERE,
base::Bind(&WifiDataProviderChromeOs::DidWifiScanTaskNoResults, this));
}
}
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());
}
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());
}
if (update_available || !is_first_scan_complete_) {
is_first_scan_complete_ = true;
RunCallbacks();
}
}
void WifiDataProviderChromeOs::ScheduleNextScan(int interval) {
DCHECK(CalledOnClientThread());
DCHECK(started_);
BrowserThread::PostDelayedTask(
BrowserThread::UI,
FROM_HERE,
base::Bind(&WifiDataProviderChromeOs::DoWifiScanTaskOnUIThread, this),
base::TimeDelta::FromMilliseconds(interval));
}
void WifiDataProviderChromeOs::ScheduleStop() {
DCHECK(CalledOnClientThread());
DCHECK(started_);
started_ = false;
}
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,
base::Bind(&WifiDataProviderChromeOs::DoStartTaskOnUIThread, this));
}
bool WifiDataProviderChromeOs::GetAccessPointData(
WifiData::AccessPointDataSet* result) {
// If wifi isn't enabled, we've effectively completed the task.
// Return true to indicate an empty access point list.
if (!chromeos::NetworkHandler::Get()->geolocation_handler()->wifi_enabled())
return true;
chromeos::WifiAccessPointVector access_points;
int64 age_ms = 0;
if (!chromeos::NetworkHandler::Get()->geolocation_handler()->
GetWifiAccessPoints(&access_points, &age_ms)) {
return false;
}
for (chromeos::WifiAccessPointVector::const_iterator i
= access_points.begin();
i != access_points.end(); ++i) {
AccessPointData ap_data;
ap_data.mac_address = base::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 = base::UTF8ToUTF16(i->ssid);
result->insert(ap_data);
}
// If the age is significantly longer than our long polling time, assume the
// data is stale and return false which will trigger a faster update.
if (age_ms > kTwoNoChangePollingIntervalMilliseconds * 2)
return false;
return true;
}
// static
WifiDataProvider* WifiDataProviderManager::DefaultFactoryFunction() {
return new WifiDataProviderChromeOs();
}
} // namespace content
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