chromeos/dbus/amplifier_client.cc

   1 // Copyright 2015 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 "chromeos/dbus/amplifier_client.h"
   6
   7 #include "base/bind.h"
   8 #include "base/memory/weak_ptr.h"
   9 #include "base/message_loop/message_loop.h"
  10 #include "base/observer_list.h"
  11 #include "dbus/bus.h"
  12 #include "dbus/message.h"
  13 #include "dbus/object_path.h"
  14 #include "dbus/object_proxy.h"
  15
  16 namespace chromeos {
  17 namespace {
  18
  19 // TODO(benchan): Move these DBus constants to system_api.
  20 namespace amplifier {
  21
  22 const char kAmplifierInterface[] = "org.chromium.Amplifier";
  23 const char kAmplifierServiceName[] = "org.chromium.Amplifier";
  24 const char kAmplifierServicePath[] = "/org/chromium/Amplifier";
  25 const char kInitializeMethod[] = "Initialize";
  26 const char kSetStandbyModeMethod[] = "SetStandbyMode";
  27 const char kSetVolumeMethod[] = "SetVolume";
  28 const char kErrorSignal[] = "Error";
  29
  30 }  // namespace amplifier
  31
  32 void OnBoolDBusMethod(const BoolDBusMethodCallback& callback,
  33                       dbus::Response* response) {
  34   if (!response) {
  35     callback.Run(DBUS_METHOD_CALL_FAILURE, false);
  36     return;
  37   }
  38
  39   dbus::MessageReader reader(response);
  40   bool result;
  41   if (!reader.PopBool(&result)) {
  42     callback.Run(DBUS_METHOD_CALL_FAILURE, false);
  43     return;
  44   }
  45
  46   callback.Run(DBUS_METHOD_CALL_SUCCESS, result);
  47 }
  48
  49 void OnVoidDBusMethod(const VoidDBusMethodCallback& callback,
  50                       dbus::Response* response) {
  51   callback.Run(response ? DBUS_METHOD_CALL_SUCCESS : DBUS_METHOD_CALL_FAILURE);
  52 }
  53
  54 // The AmplifierClient implementation.
  55 class AmplifierClientImpl : public AmplifierClient {
  56  public:
  57   AmplifierClientImpl()
  58       : proxy_(nullptr), signal_connected_(false), weak_ptr_factory_(this) {}
  59
  60   ~AmplifierClientImpl() override {}
  61
  62   // DBusClient overrides:
  63   void Init(dbus::Bus* bus) override;
  64
  65   // AmplifierClient overrides:
  66   void AddObserver(Observer* observer) override;
  67   void RemoveObserver(Observer* observer) override;
  68   void Initialize(const BoolDBusMethodCallback& callback) override;
  69   void SetStandbyMode(bool standby,
  70                       const VoidDBusMethodCallback& callback) override;
  71   void SetVolume(double db_spl,
  72                  const VoidDBusMethodCallback& callback) override;
  73
  74  private:
  75   // Handles Error signal and notifies |observers_|.
  76   void OnError(dbus::Signal* signal);
  77
  78   // Handles the result of signal connection setup.
  79   void OnSignalConnected(const std::string& interface,
  80                          const std::string& signal,
  81                          bool succeeded);
  82
  83   dbus::ObjectProxy* proxy_;
  84
  85   // True when |proxy_| has been connected to the Error signal.
  86   bool signal_connected_;
  87
  88   // List of observers interested in event notifications from us.
  89   base::ObserverList<Observer> observers_;
  90
  91   // Note: This should remain the last member so it'll be destroyed and
  92   // invalidate its weak pointers before any other members are destroyed.
  93   base::WeakPtrFactory<AmplifierClientImpl> weak_ptr_factory_;
  94
  95   DISALLOW_COPY_AND_ASSIGN(AmplifierClientImpl);
  96 };
  97
  98 void AmplifierClientImpl::Init(dbus::Bus* bus) {
  99   proxy_ =
 100       bus->GetObjectProxy(amplifier::kAmplifierServiceName,
 101                           dbus::ObjectPath(amplifier::kAmplifierServicePath));
 102   DCHECK(proxy_);
 103 }
 104
 105 void AmplifierClientImpl::AddObserver(Observer* observer) {
 106   DCHECK(observer);
 107   if (!signal_connected_ && proxy_) {
 108     signal_connected_ = true;
 109     proxy_->ConnectToSignal(amplifier::kAmplifierInterface,
 110                             amplifier::kErrorSignal,
 111                             base::Bind(&AmplifierClientImpl::OnError,
 112                                        weak_ptr_factory_.GetWeakPtr()),
 113                             base::Bind(&AmplifierClientImpl::OnSignalConnected,
 114                                        weak_ptr_factory_.GetWeakPtr()));
 115   }
 116   observers_.AddObserver(observer);
 117 }
 118
 119 void AmplifierClientImpl::RemoveObserver(Observer* observer) {
 120   DCHECK(observer);
 121   observers_.RemoveObserver(observer);
 122 }
 123
 124 void AmplifierClientImpl::Initialize(const BoolDBusMethodCallback& callback) {
 125   dbus::MethodCall method_call(amplifier::kAmplifierInterface,
 126                                amplifier::kInitializeMethod);
 127   DCHECK(proxy_);
 128   proxy_->CallMethod(&method_call, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
 129                      base::Bind(&OnBoolDBusMethod, callback));
 130 }
 131
 132 void AmplifierClientImpl::SetStandbyMode(
 133     bool standby,
 134     const VoidDBusMethodCallback& callback) {
 135   dbus::MethodCall method_call(amplifier::kAmplifierInterface,
 136                                amplifier::kSetStandbyModeMethod);
 137   dbus::MessageWriter writer(&method_call);
 138   writer.AppendBool(standby);
 139   DCHECK(proxy_);
 140   proxy_->CallMethod(&method_call, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
 141                      base::Bind(&OnVoidDBusMethod, callback));
 142 }
 143
 144 void AmplifierClientImpl::SetVolume(double db_spl,
 145                                     const VoidDBusMethodCallback& callback) {
 146   dbus::MethodCall method_call(amplifier::kAmplifierInterface,
 147                                amplifier::kSetVolumeMethod);
 148   dbus::MessageWriter writer(&method_call);
 149   writer.AppendDouble(db_spl);
 150   DCHECK(proxy_);
 151   proxy_->CallMethod(&method_call, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
 152                      base::Bind(&OnVoidDBusMethod, callback));
 153 }
 154
 155 void AmplifierClientImpl::OnError(dbus::Signal* signal) {
 156   dbus::MessageReader reader(signal);
 157   int32 error_code = 0;
 158   if (!reader.PopInt32(&error_code)) {
 159     LOG(ERROR) << "Invalid signal: " << signal->ToString();
 160     return;
 161   }
 162   FOR_EACH_OBSERVER(Observer, observers_, OnError(error_code));
 163 }
 164
 165 void AmplifierClientImpl::OnSignalConnected(const std::string& interface,
 166                                             const std::string& signal,
 167                                             bool succeeded) {
 168   LOG_IF(ERROR, !succeeded) << "Connect to " << interface << " " << signal
 169                             << " failed.";
 170 }
 171
 172 }  // anonymous namespace
 173
 174 AmplifierClient::AmplifierClient() {
 175 }
 176
 177 AmplifierClient::~AmplifierClient() {
 178 }
 179
 180 // static
 181 AmplifierClient* AmplifierClient::Create() {
 182   return new AmplifierClientImpl();
 183 }
 184
 185 }  // namespace chromeos