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// Copyright 2015 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.
#include "chromeos/dbus/amplifier_client.h"
#include "base/bind.h"
#include "base/memory/weak_ptr.h"
#include "base/message_loop/message_loop.h"
#include "base/observer_list.h"
#include "dbus/bus.h"
#include "dbus/message.h"
#include "dbus/object_path.h"
#include "dbus/object_proxy.h"
namespace chromeos {
namespace {
// TODO(benchan): Move these DBus constants to system_api.
namespace amplifier {
const char kAmplifierInterface[] = "org.chromium.Amplifier";
const char kAmplifierServiceName[] = "org.chromium.Amplifier";
const char kAmplifierServicePath[] = "/org/chromium/Amplifier";
const char kInitializeMethod[] = "Initialize";
const char kSetStandbyModeMethod[] = "SetStandbyMode";
const char kSetVolumeMethod[] = "SetVolume";
const char kErrorSignal[] = "Error";
} // namespace amplifier
void OnBoolDBusMethod(const BoolDBusMethodCallback& callback,
dbus::Response* response) {
if (!response) {
callback.Run(DBUS_METHOD_CALL_FAILURE, false);
return;
}
dbus::MessageReader reader(response);
bool result;
if (!reader.PopBool(&result)) {
callback.Run(DBUS_METHOD_CALL_FAILURE, false);
return;
}
callback.Run(DBUS_METHOD_CALL_SUCCESS, result);
}
void OnVoidDBusMethod(const VoidDBusMethodCallback& callback,
dbus::Response* response) {
callback.Run(response ? DBUS_METHOD_CALL_SUCCESS : DBUS_METHOD_CALL_FAILURE);
}
// The AmplifierClient implementation.
class AmplifierClientImpl : public AmplifierClient {
public:
AmplifierClientImpl()
: proxy_(nullptr), signal_connected_(false), weak_ptr_factory_(this) {}
~AmplifierClientImpl() override {}
// DBusClient overrides:
void Init(dbus::Bus* bus) override;
// AmplifierClient overrides:
void AddObserver(Observer* observer) override;
void RemoveObserver(Observer* observer) override;
void Initialize(const BoolDBusMethodCallback& callback) override;
void SetStandbyMode(bool standby,
const VoidDBusMethodCallback& callback) override;
void SetVolume(double db_spl,
const VoidDBusMethodCallback& callback) override;
private:
// Handles Error signal and notifies |observers_|.
void OnError(dbus::Signal* signal);
// Handles the result of signal connection setup.
void OnSignalConnected(const std::string& interface,
const std::string& signal,
bool succeeded);
dbus::ObjectProxy* proxy_;
// True when |proxy_| has been connected to the Error signal.
bool signal_connected_;
// List of observers interested in event notifications from us.
base::ObserverList<Observer> observers_;
// Note: This should remain the last member so it'll be destroyed and
// invalidate its weak pointers before any other members are destroyed.
base::WeakPtrFactory<AmplifierClientImpl> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(AmplifierClientImpl);
};
void AmplifierClientImpl::Init(dbus::Bus* bus) {
proxy_ =
bus->GetObjectProxy(amplifier::kAmplifierServiceName,
dbus::ObjectPath(amplifier::kAmplifierServicePath));
DCHECK(proxy_);
}
void AmplifierClientImpl::AddObserver(Observer* observer) {
DCHECK(observer);
if (!signal_connected_ && proxy_) {
signal_connected_ = true;
proxy_->ConnectToSignal(amplifier::kAmplifierInterface,
amplifier::kErrorSignal,
base::Bind(&AmplifierClientImpl::OnError,
weak_ptr_factory_.GetWeakPtr()),
base::Bind(&AmplifierClientImpl::OnSignalConnected,
weak_ptr_factory_.GetWeakPtr()));
}
observers_.AddObserver(observer);
}
void AmplifierClientImpl::RemoveObserver(Observer* observer) {
DCHECK(observer);
observers_.RemoveObserver(observer);
}
void AmplifierClientImpl::Initialize(const BoolDBusMethodCallback& callback) {
dbus::MethodCall method_call(amplifier::kAmplifierInterface,
amplifier::kInitializeMethod);
DCHECK(proxy_);
proxy_->CallMethod(&method_call, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
base::Bind(&OnBoolDBusMethod, callback));
}
void AmplifierClientImpl::SetStandbyMode(
bool standby,
const VoidDBusMethodCallback& callback) {
dbus::MethodCall method_call(amplifier::kAmplifierInterface,
amplifier::kSetStandbyModeMethod);
dbus::MessageWriter writer(&method_call);
writer.AppendBool(standby);
DCHECK(proxy_);
proxy_->CallMethod(&method_call, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
base::Bind(&OnVoidDBusMethod, callback));
}
void AmplifierClientImpl::SetVolume(double db_spl,
const VoidDBusMethodCallback& callback) {
dbus::MethodCall method_call(amplifier::kAmplifierInterface,
amplifier::kSetVolumeMethod);
dbus::MessageWriter writer(&method_call);
writer.AppendDouble(db_spl);
DCHECK(proxy_);
proxy_->CallMethod(&method_call, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
base::Bind(&OnVoidDBusMethod, callback));
}
void AmplifierClientImpl::OnError(dbus::Signal* signal) {
dbus::MessageReader reader(signal);
int32 error_code = 0;
if (!reader.PopInt32(&error_code)) {
LOG(ERROR) << "Invalid signal: " << signal->ToString();
return;
}
FOR_EACH_OBSERVER(Observer, observers_, OnError(error_code));
}
void AmplifierClientImpl::OnSignalConnected(const std::string& interface,
const std::string& signal,
bool succeeded) {
LOG_IF(ERROR, !succeeded) << "Connect to " << interface << " " << signal
<< " failed.";
}
} // anonymous namespace
AmplifierClient::AmplifierClient() {
}
AmplifierClient::~AmplifierClient() {
}
// static
AmplifierClient* AmplifierClient::Create() {
return new AmplifierClientImpl();
}
} // namespace chromeos
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