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