src/chrome/browser/chromeos/power/peripheral_battery_observer.cc

   1 // Copyright (c) 2013 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.
   4
   5 #include "chrome/browser/chromeos/power/peripheral_battery_observer.h"
   6
   7 #include <vector>
   8
   9 #include "ash/shell.h"
  10 #include "base/bind.h"
  11 #include "base/strings/string16.h"
  12 #include "base/strings/string_split.h"
  13 #include "base/strings/stringprintf.h"
  14 #include "base/strings/utf_string_conversions.h"
  15 #include "chrome/browser/browser_process.h"
  16 #include "chrome/browser/notifications/notification.h"
  17 #include "chrome/browser/notifications/notification_ui_manager.h"
  18 #include "chrome/browser/profiles/profile_manager.h"
  19 #include "chromeos/dbus/dbus_thread_manager.h"
  20 #include "content/public/browser/browser_thread.h"
  21 #include "device/bluetooth/bluetooth_adapter_factory.h"
  22 #include "device/bluetooth/bluetooth_device.h"
  23 #include "grit/ash_strings.h"
  24 #include "grit/theme_resources.h"
  25 #include "ui/base/l10n/l10n_util.h"
  26 #include "ui/base/resource/resource_bundle.h"
  27 #include "ui/gfx/image/image.h"
  28
  29 namespace chromeos {
  30
  31 namespace {
  32
  33 // When a peripheral device's battery level is <= kLowBatteryLevel, consider
  34 // it to be in low battery condition.
  35 const int kLowBatteryLevel = 15;
  36
  37 // Don't show 2 low battery notification within |kNotificationIntervalSec|
  38 // seconds.
  39 const int kNotificationIntervalSec = 60;
  40
  41 const char kNotificationOriginUrl[] = "chrome://peripheral-battery";
  42
  43 // HID Bluetooth device's battery sysfs entry path looks like
  44 // "/sys/class/power_supply/hid-AA:BB:CC:DD:EE:FF-battery".
  45 // Here the bluetooth address is showed in reverse order and its true
  46 // address "FF:EE:DD:CC:BB:AA".
  47 const char kHIDBatteryPathPrefix[] = "/sys/class/power_supply/hid-";
  48 const char kHIDBatteryPathSuffix[] = "-battery";
  49
  50 bool IsBluetoothHIDBattery(const std::string& path) {
  51   return StartsWithASCII(path, kHIDBatteryPathPrefix, false) &&
  52       EndsWith(path, kHIDBatteryPathSuffix, false);
  53 }
  54
  55 std::string ExtractBluetoothAddress(const std::string& path) {
  56   int header_size = strlen(kHIDBatteryPathPrefix);
  57   int end_size = strlen(kHIDBatteryPathSuffix);
  58   int key_len = path.size() - header_size - end_size;
  59   if (key_len <= 0)
  60     return std::string();
  61   std::string reverse_address = path.substr(header_size, key_len);
  62   StringToLowerASCII(&reverse_address);
  63   std::vector<std::string> result;
  64   base::SplitString(reverse_address, ':', &result);
  65   std::reverse(result.begin(), result.end());
  66   std::string address = JoinString(result, ':');
  67   return address;
  68 }
  69
  70 class PeripheralBatteryNotificationDelegate : public NotificationDelegate {
  71  public:
  72   explicit PeripheralBatteryNotificationDelegate(const std::string& id)
  73       : id_(id) {}
  74
  75   // Overridden from NotificationDelegate:
  76   virtual void Display() OVERRIDE {}
  77   virtual void Error() OVERRIDE {}
  78   virtual void Close(bool by_user) OVERRIDE {}
  79   virtual void Click() OVERRIDE {}
  80   virtual std::string id() const OVERRIDE { return id_; }
  81   // A NULL return value prevents loading image from URL. It is OK since our
  82   // implementation loads image from system resource bundle.
  83   virtual content::WebContents* GetWebContents() const OVERRIDE {
  84     return NULL;
  85   }
  86
  87  private:
  88   virtual ~PeripheralBatteryNotificationDelegate() {}
  89
  90   const std::string id_;
  91
  92   DISALLOW_COPY_AND_ASSIGN(PeripheralBatteryNotificationDelegate);
  93 };
  94
  95 }  // namespace
  96
  97 PeripheralBatteryObserver::PeripheralBatteryObserver()
  98     : testing_clock_(NULL),
  99       weakptr_factory_(
 100           new base::WeakPtrFactory<PeripheralBatteryObserver>(this)) {
 101   DBusThreadManager::Get()->GetPowerManagerClient()->AddObserver(this);
 102   device::BluetoothAdapterFactory::GetAdapter(
 103       base::Bind(&PeripheralBatteryObserver::InitializeOnBluetoothReady,
 104                  weakptr_factory_->GetWeakPtr()));
 105 }
 106
 107 PeripheralBatteryObserver::~PeripheralBatteryObserver() {
 108   if (bluetooth_adapter_.get())
 109     bluetooth_adapter_->RemoveObserver(this);
 110   DBusThreadManager::Get()->GetPowerManagerClient()->RemoveObserver(this);
 111 }
 112
 113 void PeripheralBatteryObserver::PeripheralBatteryStatusReceived(
 114     const std::string& path,
 115     const std::string& name,
 116     int level) {
 117   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
 118   std::string address;
 119   if (IsBluetoothHIDBattery(path)) {
 120     // For HID bluetooth device, device address is used as key to index
 121     // BatteryInfo.
 122     address = ExtractBluetoothAddress(path);
 123   } else {
 124     LOG(ERROR) << "Unsupported battery path " << path;
 125     return;
 126   }
 127
 128   if (address.empty()) {
 129     LOG(ERROR) << "No valid battery address at path " << path;
 130     return;
 131   }
 132
 133   if (level < -1 || level > 100) {
 134     LOG(ERROR) << "Invalid battery level " << level
 135                << " for device " << name << " at path " << path;
 136     return;
 137   }
 138   // If unknown battery level received, cancel any existing notification.
 139   if (level == -1) {
 140     CancelNotification(address);
 141     return;
 142   }
 143
 144   // Post the notification in 2 cases:
 145   // 1. It's the first time the battery level is received, and it is
 146   //    below kLowBatteryLevel.
 147   // 2. The battery level is in record and it drops below kLowBatteryLevel.
 148   if (batteries_.find(address) == batteries_.end()) {
 149     BatteryInfo battery(name, level, base::TimeTicks());
 150     if (level <= kLowBatteryLevel) {
 151       if (PostNotification(address, battery))
 152         battery.last_notification_timestamp = testing_clock_ ?
 153             testing_clock_->NowTicks() : base::TimeTicks::Now();
 154     }
 155     batteries_[address] = battery;
 156   } else {
 157     BatteryInfo* battery = &batteries_[address];
 158     battery->name = name;
 159     int old_level = battery->level;
 160     battery->level = level;
 161     if (old_level > kLowBatteryLevel && level <= kLowBatteryLevel) {
 162       if (PostNotification(address, *battery))
 163         battery->last_notification_timestamp = testing_clock_ ?
 164             testing_clock_->NowTicks() : base::TimeTicks::Now();
 165     }
 166   }
 167 }
 168
 169 void PeripheralBatteryObserver::DeviceChanged(device::BluetoothAdapter* adapter,
 170                                               device::BluetoothDevice* device) {
 171   if (!device->IsPaired())
 172     RemoveBattery(device->GetAddress());
 173 }
 174
 175 void PeripheralBatteryObserver::DeviceRemoved(device::BluetoothAdapter* adapter,
 176                                               device::BluetoothDevice* device) {
 177   RemoveBattery(device->GetAddress());
 178 }
 179
 180 void PeripheralBatteryObserver::InitializeOnBluetoothReady(
 181     scoped_refptr<device::BluetoothAdapter> adapter) {
 182   bluetooth_adapter_ = adapter;
 183   CHECK(bluetooth_adapter_.get());
 184   bluetooth_adapter_->AddObserver(this);
 185 }
 186
 187 void PeripheralBatteryObserver::RemoveBattery(const std::string& address) {
 188   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
 189   std::string address_lowercase = address;
 190   StringToLowerASCII(&address_lowercase);
 191   std::map<std::string, BatteryInfo>::iterator it =
 192       batteries_.find(address_lowercase);
 193   if (it != batteries_.end()) {
 194     batteries_.erase(it);
 195     CancelNotification(address_lowercase);
 196   }
 197 }
 198
 199 bool PeripheralBatteryObserver::PostNotification(const std::string& address,
 200                                                  const BatteryInfo& battery) {
 201   // Only post notification if kNotificationInterval seconds have passed since
 202   // last notification showed, avoiding the case where the battery level
 203   // oscillates around the threshold level.
 204   base::TimeTicks now = testing_clock_ ? testing_clock_->NowTicks() :
 205       base::TimeTicks::Now();
 206   if (now - battery.last_notification_timestamp <
 207       base::TimeDelta::FromSeconds(kNotificationIntervalSec))
 208     return false;
 209
 210   NotificationUIManager* notification_manager =
 211       g_browser_process->notification_ui_manager();
 212
 213   base::string16 string_text = l10n_util::GetStringFUTF16Int(
 214       IDS_ASH_LOW_PERIPHERAL_BATTERY_NOTIFICATION_TEXT,
 215       battery.level);
 216
 217   Notification notification(
 218       // TODO(mukai): add SYSTEM priority and use here.
 219       GURL(kNotificationOriginUrl),
 220       ui::ResourceBundle::GetSharedInstance().GetImageNamed(
 221           IDR_NOTIFICATION_PERIPHERAL_BATTERY_LOW),
 222       base::UTF8ToUTF16(battery.name),
 223       string_text,
 224       blink::WebTextDirectionDefault,
 225       base::string16(),
 226       base::UTF8ToUTF16(address),
 227       new PeripheralBatteryNotificationDelegate(address));
 228
 229   notification_manager->Add(
 230       notification,
 231       ProfileManager::GetPrimaryUserProfile());
 232
 233   return true;
 234 }
 235
 236 void PeripheralBatteryObserver::CancelNotification(const std::string& address) {
 237   g_browser_process->notification_ui_manager()->CancelById(address);
 238 }
 239
 240 }  // namespace chromeos