1 files changed, 286 insertions, 0 deletions
diff --git a/chromeos/dbus/bluetooth_media_transport_client.cc b/chromeos/dbus/bluetooth_media_transport_client.cc
new file mode 100644
index 0000000..3117de2
--- /dev/null
+++ b/chromeos/dbus/bluetooth_media_transport_client.cc
@@ -0,0 +1,286 @@
+// Copyright 2014 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/bluetooth_media_transport_client.h"
+
+#include "base/bind.h"
+#include "base/logging.h"
+#include "base/memory/ref_counted.h"
+#include "base/observer_list.h"
+#include "dbus/bus.h"
+#include "dbus/message.h"
+#include "dbus/object_manager.h"
+#include "dbus/object_proxy.h"
+#include "third_party/cros_system_api/dbus/service_constants.h"
+
+namespace {
+
+// TODO(mcchou): Add these service constants into dbus/service_constants.h
+// later.
+const char kBluetoothMediaTransportInterface[] = "org.bluez.MediaTransport1";
+
+// Constants used to indicate exceptional error conditions.
+const char kNoResponseError[] = "org.chromium.Error.NoResponse";
+const char kUnexpectedResponse[] = "org.chromium.Error.UnexpectedResponse";
+
+// Method names of Media Transport interface.
+const char kAcquire[] = "Acquire";
+const char kTryAcquire[] = "TryAcquire";
+const char kRelease[] = "Release";
+
+}  // namespace
+
+namespace chromeos {
+
+// static
+const char BluetoothMediaTransportClient::kDeviceProperty[] = "Device";
+const char BluetoothMediaTransportClient::kUUIDProperty[] = "UUID";
+const char BluetoothMediaTransportClient::kCodecProperty[] = "Codec";
+const char BluetoothMediaTransportClient::kConfigurationProperty[] =
+    "Configuration";
+const char BluetoothMediaTransportClient::kStateProperty[] = "State";
+const char BluetoothMediaTransportClient::kDelayProperty[] = "Delay";
+const char BluetoothMediaTransportClient::kVolumeProperty[] = "Volume";
+
+// static
+const char BluetoothMediaTransportClient::kStateIdle[] = "idle";
+const char BluetoothMediaTransportClient::kStatePending[] = "pending";
+const char BluetoothMediaTransportClient::kStateActive[] = "active";
+
+BluetoothMediaTransportClient::Properties::Properties(
+    dbus::ObjectProxy* object_proxy,
+    const std::string& interface_name,
+    const PropertyChangedCallback& callback)
+    : dbus::PropertySet(object_proxy, interface_name, callback) {
+  RegisterProperty(kDeviceProperty, &device);
+  RegisterProperty(kUUIDProperty, &uuid);
+  RegisterProperty(kCodecProperty, &codec);
+  RegisterProperty(kConfigurationProperty, &configuration);
+  RegisterProperty(kStateProperty, &state);
+  RegisterProperty(kDelayProperty, &delay);
+  RegisterProperty(kVolumeProperty, &volume);
+}
+
+BluetoothMediaTransportClient::Properties::~Properties() {}
+
+class BluetoothMediaTransportClientImpl
+    : public BluetoothMediaTransportClient,
+      public dbus::ObjectManager::Interface {
+ public:
+  BluetoothMediaTransportClientImpl()
+      : object_manager_(nullptr), weak_ptr_factory_(this) {}
+
+  ~BluetoothMediaTransportClientImpl() override {
+    object_manager_->UnregisterInterface(kBluetoothMediaTransportInterface);
+  }
+
+  // dbus::ObjectManager::Interface overrides.
+
+  dbus::PropertySet* CreateProperties(
+      dbus::ObjectProxy* object_proxy,
+      const dbus::ObjectPath& object_path,
+      const std::string& interface_name) override {
+    Properties* properties = new Properties(
+        object_proxy, interface_name,
+        base::Bind(&BluetoothMediaTransportClientImpl::OnPropertyChanged,
+                   weak_ptr_factory_.GetWeakPtr(), object_path));
+    return properties;
+  }
+
+  void ObjectAdded(const dbus::ObjectPath& object_path,
+                   const std::string& interface_name) override {
+    VLOG(1) << "Remote Media Transport added: " << object_path.value();
+    FOR_EACH_OBSERVER(BluetoothMediaTransportClient::Observer, observers_,
+                      MediaTransportAdded(object_path));
+  }
+
+  void ObjectRemoved(const dbus::ObjectPath& object_path,
+                     const std::string& interface_name) override {
+    VLOG(1) << "Remote Media Transport removed: " << object_path.value();
+    FOR_EACH_OBSERVER(BluetoothMediaTransportClient::Observer, observers_,
+                      MediaTransportRemoved(object_path));
+  }
+
+  // BluetoothMediaTransportClient overrides.
+
+  void AddObserver(BluetoothMediaTransportClient::Observer* observer) override {
+    DCHECK(observer);
+    observers_.AddObserver(observer);
+  }
+
+  void RemoveObserver(
+      BluetoothMediaTransportClient::Observer* observer) override {
+    DCHECK(observer);
+    observers_.RemoveObserver(observer);
+  }
+
+  Properties* GetProperties(const dbus::ObjectPath& object_path) override {
+    DCHECK(object_manager_);
+    return static_cast<Properties*>(object_manager_->GetProperties(
+        object_path, kBluetoothMediaTransportInterface));
+  }
+
+  void Acquire(const dbus::ObjectPath& object_path,
+               const AcquireCallback& callback,
+               const ErrorCallback& error_callback) override {
+    VLOG(1) << "Acquire - transport: " << object_path.value();
+
+    DCHECK(object_manager_);
+
+    dbus::MethodCall method_call(kBluetoothMediaTransportInterface, kAcquire);
+
+    // Get object proxy.
+    scoped_refptr<dbus::ObjectProxy> object_proxy(
+        object_manager_->GetObjectProxy(object_path));
+
+    // Call Acquire method of Media Transport interface.
+    object_proxy->CallMethodWithErrorCallback(
+        &method_call, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
+        base::Bind(&BluetoothMediaTransportClientImpl::OnAcquireSuccess,
+                   weak_ptr_factory_.GetWeakPtr(), callback, error_callback),
+        base::Bind(&BluetoothMediaTransportClientImpl::OnError,
+                   weak_ptr_factory_.GetWeakPtr(), error_callback));
+  }
+
+  void TryAcquire(const dbus::ObjectPath& object_path,
+                  const AcquireCallback& callback,
+                  const ErrorCallback& error_callback) override {
+    VLOG(1) << "TryAcquire - transport: " << object_path.value();
+
+    DCHECK(object_manager_);
+
+    dbus::MethodCall method_call(kBluetoothMediaTransportInterface,
+                                 kTryAcquire);
+
+    // Get object proxy.
+    scoped_refptr<dbus::ObjectProxy> object_proxy(
+        object_manager_->GetObjectProxy(object_path));
+
+    // Call TryAcquire method of Media Transport interface.
+    object_proxy->CallMethodWithErrorCallback(
+        &method_call, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
+        base::Bind(&BluetoothMediaTransportClientImpl::OnAcquireSuccess,
+                   weak_ptr_factory_.GetWeakPtr(), callback, error_callback),
+        base::Bind(&BluetoothMediaTransportClientImpl::OnError,
+                   weak_ptr_factory_.GetWeakPtr(), error_callback));
+  }
+
+  void Release(const dbus::ObjectPath& object_path,
+               const base::Closure& callback,
+               const ErrorCallback& error_callback) override {
+    VLOG(1) << "Release - transport: " << object_path.value();
+
+    DCHECK(object_manager_);
+
+    dbus::MethodCall method_call(kBluetoothMediaTransportInterface, kRelease);
+
+    // Get object proxy.
+    scoped_refptr<dbus::ObjectProxy> object_proxy(
+        object_manager_->GetObjectProxy(object_path));
+
+    // Call TryAcquire method of Media Transport interface.
+    object_proxy->CallMethodWithErrorCallback(
+        &method_call, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
+        base::Bind(&BluetoothMediaTransportClientImpl::OnSuccess,
+                   weak_ptr_factory_.GetWeakPtr(), callback),
+        base::Bind(&BluetoothMediaTransportClientImpl::OnError,
+                   weak_ptr_factory_.GetWeakPtr(), error_callback));
+  }
+
+ protected:
+  void Init(dbus::Bus* bus) override {
+    DCHECK(bus);
+    object_manager_ = bus->GetObjectManager(
+        bluetooth_object_manager::kBluetoothObjectManagerServiceName,
+        dbus::ObjectPath(
+            bluetooth_object_manager::kBluetoothObjectManagerServicePath));
+    object_manager_->RegisterInterface(kBluetoothMediaTransportInterface, this);
+  }
+
+ private:
+  // Called by dbus::PropertySet when a property value is changed.
+  void OnPropertyChanged(const dbus::ObjectPath& object_path,
+                         const std::string& property_name) {
+    VLOG(1) << "Name of the changed property: " << property_name;
+
+    // Dispatches the change to the corresponding property-changed handler.
+    FOR_EACH_OBSERVER(
+        BluetoothMediaTransportClient::Observer, observers_,
+        MediaTransportPropertyChanged(object_path, property_name));
+  }
+
+  // Called when a response for successful method call is received.
+  void OnSuccess(const base::Closure& callback, dbus::Response* response) {
+    DCHECK(response);
+    callback.Run();
+  }
+
+  // Called when a response for |Acquire|/|TryAcquire| method call is received.
+  void OnAcquireSuccess(const AcquireCallback& callback,
+                        const ErrorCallback& error_callback,
+                        dbus::Response* response) {
+    DCHECK(response);
+
+    dbus::FileDescriptor fd;
+    uint16_t read_mtu;
+    uint16_t write_mtu;
+
+    // Parse the response.
+    dbus::MessageReader reader(response);
+    if (reader.PopFileDescriptor(&fd) && reader.PopUint16(&read_mtu) &&
+        reader.PopUint16(&write_mtu)) {
+      fd.CheckValidity();
+      DCHECK(fd.is_valid());
+
+      VLOG(1) << "OnAcquireSuccess - fd: " << fd.value()
+              << ", read MTU: " << read_mtu << ", write MTU: " << write_mtu;
+
+      // The ownership of the file descriptor is transferred to the user
+      // application.
+      callback.Run(&fd, read_mtu, write_mtu);
+      return;
+    }
+
+    error_callback.Run(
+        kUnexpectedResponse,
+        "Failed to retrieve file descriptor, read MTU and write MTU.");
+  }
+
+  // Called when a response for a failed method call is received.
+  void OnError(const ErrorCallback& error_callback,
+               dbus::ErrorResponse* response) {
+    DCHECK(response);
+
+    // Error response has optional error message argument.
+    std::string error_name;
+    std::string error_message;
+    if (response) {
+      dbus::MessageReader reader(response);
+      error_name = response->GetErrorName();
+      reader.PopString(&error_message);
+    } else {
+      error_name = kNoResponseError;
+    }
+    error_callback.Run(error_name, error_message);
+  }
+
+  dbus::ObjectManager* object_manager_;
+
+  // List of observers interested in event notifications from us.
+  base::ObserverList<BluetoothMediaTransportClient::Observer> observers_;
+
+  base::WeakPtrFactory<BluetoothMediaTransportClientImpl> weak_ptr_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(BluetoothMediaTransportClientImpl);
+};
+
+BluetoothMediaTransportClient::BluetoothMediaTransportClient() {}
+
+BluetoothMediaTransportClient::~BluetoothMediaTransportClient() {}
+
+BluetoothMediaTransportClient* BluetoothMediaTransportClient::Create() {
+  return new BluetoothMediaTransportClientImpl();
+}
+
+}  // namespace chromeos