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 StartsWithASCII(path, kHIDBatteryPathPrefix, false) &&
  53       EndsWith(path, kHIDBatteryPathSuffix, false);
  54 }
  55
  56 std::string ExtractBluetoothAddress(const std::string& path) {
  57   int header_size = strlen(kHIDBatteryPathPrefix);
  58   int end_size = strlen(kHIDBatteryPathSuffix);
  59   int key_len = path.size() - header_size - end_size;
  60   if (key_len <= 0)
  61     return std::string();
  62   std::string reverse_address = path.substr(header_size, key_len);
  63   base::StringToLowerASCII(&reverse_address);
  64   std::vector<std::string> result;
  65   base::SplitString(reverse_address, ':', &result);
  66   std::reverse(result.begin(), result.end());
  67   std::string address = JoinString(result, ':');
  68   return address;
  69 }
  70
  71 class PeripheralBatteryNotificationDelegate : public NotificationDelegate {
  72  public:
  73   explicit PeripheralBatteryNotificationDelegate(const std::string& id)
  74       : id_(id) {}
  75
  76   // Overridden from NotificationDelegate:
  77   std::string id() const override { return id_; }
  78
  79  private:
  80   ~PeripheralBatteryNotificationDelegate() override {}
  81
  82   const std::string id_;
  83
  84   DISALLOW_COPY_AND_ASSIGN(PeripheralBatteryNotificationDelegate);
  85 };
  86
  87 }  // namespace
  88
  89 PeripheralBatteryObserver::PeripheralBatteryObserver()
  90     : testing_clock_(NULL),
  91       notification_profile_(NULL),
  92       weakptr_factory_(
  93           new base::WeakPtrFactory<PeripheralBatteryObserver>(this)) {
  94   DBusThreadManager::Get()->GetPowerManagerClient()->AddObserver(this);
  95   device::BluetoothAdapterFactory::GetAdapter(
  96       base::Bind(&PeripheralBatteryObserver::InitializeOnBluetoothReady,
  97                  weakptr_factory_->GetWeakPtr()));
  98 }
  99
 100 PeripheralBatteryObserver::~PeripheralBatteryObserver() {
 101   if (bluetooth_adapter_.get())
 102     bluetooth_adapter_->RemoveObserver(this);
 103   DBusThreadManager::Get()->GetPowerManagerClient()->RemoveObserver(this);
 104 }
 105
 106 void PeripheralBatteryObserver::PeripheralBatteryStatusReceived(
 107     const std::string& path,
 108     const std::string& name,
 109     int level) {
 110   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
 111   std::string address;
 112   if (IsBluetoothHIDBattery(path)) {
 113     // For HID bluetooth device, device address is used as key to index
 114     // BatteryInfo.
 115     address = ExtractBluetoothAddress(path);
 116   } else {
 117     LOG(ERROR) << "Unsupported battery path " << path;
 118     return;
 119   }
 120
 121   if (address.empty()) {
 122     LOG(ERROR) << "No valid battery address at path " << path;
 123     return;
 124   }
 125
 126   if (level < -1 || level > 100) {
 127     LOG(ERROR) << "Invalid battery level " << level
 128                << " for device " << name << " at path " << path;
 129     return;
 130   }
 131   // If unknown battery level received, cancel any existing notification.
 132   if (level == -1) {
 133     CancelNotification(address);
 134     return;
 135   }
 136
 137   // Post the notification in 2 cases:
 138   // 1. It's the first time the battery level is received, and it is
 139   //    below kLowBatteryLevel.
 140   // 2. The battery level is in record and it drops below kLowBatteryLevel.
 141   if (batteries_.find(address) == batteries_.end()) {
 142     BatteryInfo battery(name, level, base::TimeTicks());
 143     if (level <= kLowBatteryLevel) {
 144       if (PostNotification(address, battery))
 145         battery.last_notification_timestamp = testing_clock_ ?
 146             testing_clock_->NowTicks() : base::TimeTicks::Now();
 147     }
 148     batteries_[address] = battery;
 149   } else {
 150     BatteryInfo* battery = &batteries_[address];
 151     battery->name = name;
 152     int old_level = battery->level;
 153     battery->level = level;
 154     if (old_level > kLowBatteryLevel && level <= kLowBatteryLevel) {
 155       if (PostNotification(address, *battery))
 156         battery->last_notification_timestamp = testing_clock_ ?
 157             testing_clock_->NowTicks() : base::TimeTicks::Now();
 158     }
 159   }
 160 }
 161
 162 void PeripheralBatteryObserver::DeviceChanged(device::BluetoothAdapter* adapter,
 163                                               device::BluetoothDevice* device) {
 164   if (!device->IsPaired())
 165     RemoveBattery(device->GetAddress());
 166 }
 167
 168 void PeripheralBatteryObserver::DeviceRemoved(device::BluetoothAdapter* adapter,
 169                                               device::BluetoothDevice* device) {
 170   RemoveBattery(device->GetAddress());
 171 }
 172
 173 void PeripheralBatteryObserver::InitializeOnBluetoothReady(
 174     scoped_refptr<device::BluetoothAdapter> adapter) {
 175   bluetooth_adapter_ = adapter;
 176   CHECK(bluetooth_adapter_.get());
 177   bluetooth_adapter_->AddObserver(this);
 178 }
 179
 180 void PeripheralBatteryObserver::RemoveBattery(const std::string& address) {
 181   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
 182   std::string address_lowercase = address;
 183   base::StringToLowerASCII(&address_lowercase);
 184   std::map<std::string, BatteryInfo>::iterator it =
 185       batteries_.find(address_lowercase);
 186   if (it != batteries_.end()) {
 187     batteries_.erase(it);
 188     CancelNotification(address_lowercase);
 189   }
 190 }
 191
 192 bool PeripheralBatteryObserver::PostNotification(const std::string& address,
 193                                                  const BatteryInfo& battery) {
 194   // Only post notification if kNotificationInterval seconds have passed since
 195   // last notification showed, avoiding the case where the battery level
 196   // oscillates around the threshold level.
 197   base::TimeTicks now = testing_clock_ ? testing_clock_->NowTicks() :
 198       base::TimeTicks::Now();
 199   if (now - battery.last_notification_timestamp <
 200       base::TimeDelta::FromSeconds(kNotificationIntervalSec))
 201     return false;
 202
 203   NotificationUIManager* notification_manager =
 204       g_browser_process->notification_ui_manager();
 205
 206   base::string16 string_text = l10n_util::GetStringFUTF16Int(
 207       IDS_ASH_LOW_PERIPHERAL_BATTERY_NOTIFICATION_TEXT,
 208       battery.level);
 209
 210   Notification notification(
 211       message_center::NOTIFICATION_TYPE_SIMPLE, GURL(kNotificationOriginUrl),
 212       base::UTF8ToUTF16(battery.name), string_text,
 213       ui::ResourceBundle::GetSharedInstance().GetImageNamed(
 214           IDR_NOTIFICATION_PERIPHERAL_BATTERY_LOW),
 215       message_center::NotifierId(GURL(kNotificationOriginUrl)),
 216       base::string16(), address, message_center::RichNotificationData(),
 217       new PeripheralBatteryNotificationDelegate(address));
 218
 219   notification.set_priority(message_center::SYSTEM_PRIORITY);
 220
 221   notification_profile_ = ProfileManager::GetPrimaryUserProfile();
 222   notification_manager->Add(notification, notification_profile_);
 223
 224   return true;
 225 }
 226
 227 void PeripheralBatteryObserver::CancelNotification(const std::string& address) {
 228   // If last_used_profile_ is NULL then no notification has been posted yet.
 229   if (notification_profile_) {
 230     g_browser_process->notification_ui_manager()->CancelById(
 231         address, NotificationUIManager::GetProfileID(notification_profile_));
 232   }
 233 }
 234
 235 }  // namespace chromeos