Reland 2:Geolocation: move from content/browser to device/

content/browser/geolocation/wifi_data_provider_chromeos.cc

-// 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 <stdint.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_task_runner()->PostTask(
-        FROM_HERE,
-        base::Bind(&WifiDataProviderChromeOs::DidWifiScanTask, this, new_data));
-  } else {
-    client_task_runner()->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_t age_ms = 0;
-  if (!chromeos::NetworkHandler::Get()->geolocation_handler()->
-      GetWifiAccessPoints(&access_points, &age_ms)) {
-    return false;
-  }
-  for (const auto& access_point : access_points) {
-    AccessPointData ap_data;
-    ap_data.mac_address = base::ASCIIToUTF16(access_point.mac_address);
-    ap_data.radio_signal_strength = access_point.signal_strength;
-    ap_data.channel = access_point.channel;
-    ap_data.signal_to_noise = access_point.signal_to_noise;
-    ap_data.ssid = base::UTF8ToUTF16(access_point.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