device/bluetooth: Update characteristic value D-Bus bindings.

device/bluetooth/bluetooth_remote_gatt_characteristic_chromeos.cc

Index: device/bluetooth/bluetooth_remote_gatt_characteristic_chromeos.cc
diff --git a/device/bluetooth/bluetooth_remote_gatt_characteristic_chromeos.cc b/device/bluetooth/bluetooth_remote_gatt_characteristic_chromeos.cc
index 3d3e15ccf56ed198081d14c483bdca63186e0ed0..0a8a2253fb735501d18ce23f00cdf7a7467d0f70 100644
--- a/device/bluetooth/bluetooth_remote_gatt_characteristic_chromeos.cc
+++ b/device/bluetooth/bluetooth_remote_gatt_characteristic_chromeos.cc
@@ -6,7 +6,6 @@
 
 #include "base/logging.h"
 #include "base/strings/stringprintf.h"
-#include "chromeos/dbus/bluetooth_gatt_characteristic_client.h"
 #include "chromeos/dbus/dbus_thread_manager.h"
 #include "device/bluetooth/bluetooth_remote_gatt_descriptor_chromeos.h"
 #include "device/bluetooth/bluetooth_remote_gatt_service_chromeos.h"
@@ -37,6 +36,8 @@ BluetoothRemoteGattCharacteristicChromeOS::
           weak_ptr_factory_(this) {
   VLOG(1) << "Creating remote GATT characteristic with identifier: "
           << GetIdentifier() << ", UUID: " << GetUUID().canonical_value();
+  DBusThreadManager::Get()->GetBluetoothGattCharacteristicClient()->
+      AddObserver(this);
   DBusThreadManager::Get()->GetBluetoothGattDescriptorClient()->
       AddObserver(this);
 
@@ -53,6 +54,8 @@ BluetoothRemoteGattCharacteristicChromeOS::
     ~BluetoothRemoteGattCharacteristicChromeOS() {
   DBusThreadManager::Get()->GetBluetoothGattDescriptorClient()->
       RemoveObserver(this);
+  DBusThreadManager::Get()->GetBluetoothGattCharacteristicClient()->
+      RemoveObserver(this);
 
   // Clean up all the descriptors. There isn't much point in notifying service
   // observers for each descriptor that gets removed, so just delete them.
@@ -80,11 +83,7 @@ bool BluetoothRemoteGattCharacteristicChromeOS::IsLocal() const {
 
 const std::vector<uint8>&
 BluetoothRemoteGattCharacteristicChromeOS::GetValue() const {
-  BluetoothGattCharacteristicClient::Properties* properties =
-      DBusThreadManager::Get()->GetBluetoothGattCharacteristicClient()->
-          GetProperties(object_path_);
-  DCHECK(properties);
-  return properties->value.value();
+  return cached_value_;
 }
 
 device::BluetoothGattService*
@@ -173,14 +172,15 @@ void BluetoothRemoteGattCharacteristicChromeOS::ReadRemoteCharacteristic(
   VLOG(1) << "Sending GATT characteristic read request to characteristic: "
           << GetIdentifier() << ", UUID: " << GetUUID().canonical_value()
           << ".";
-  BluetoothGattCharacteristicClient::Properties* properties =
-      DBusThreadManager::Get()->GetBluetoothGattCharacteristicClient()->
-          GetProperties(object_path_);
-  DCHECK(properties);
-  properties->value.Get(
-      base::Bind(&BluetoothRemoteGattCharacteristicChromeOS::OnGetValue,
+
+  DBusThreadManager::Get()->GetBluetoothGattCharacteristicClient()->ReadValue(
+      object_path_,
+      base::Bind(&BluetoothRemoteGattCharacteristicChromeOS::OnValueSuccess,
                  weak_ptr_factory_.GetWeakPtr(),
-                 callback, error_callback));
+                 callback),
+      base::Bind(&BluetoothRemoteGattCharacteristicChromeOS::OnError,
+                 weak_ptr_factory_.GetWeakPtr(),
+                 error_callback));
 }
 
 void BluetoothRemoteGattCharacteristicChromeOS::WriteRemoteCharacteristic(
@@ -191,22 +191,27 @@ void BluetoothRemoteGattCharacteristicChromeOS::WriteRemoteCharacteristic(
           << GetIdentifier() << ", UUID: " << GetUUID().canonical_value()
           << ", with value: " << new_value << ".";
 
-  // Permission and bonding are handled by BlueZ so no need check it here.
-  if (new_value.empty()) {
-    VLOG(1) << "Nothing to write.";
-    error_callback.Run();
-    return;
-  }
-
-  BluetoothGattCharacteristicClient::Properties* properties =
-      DBusThreadManager::Get()->GetBluetoothGattCharacteristicClient()->
-          GetProperties(object_path_);
-  DCHECK(properties);
-  properties->value.Set(
+  DBusThreadManager::Get()->GetBluetoothGattCharacteristicClient()->WriteValue(
+      object_path_,
       new_value,
-      base::Bind(&BluetoothRemoteGattCharacteristicChromeOS::OnSetValue,
+      callback,
+      base::Bind(&BluetoothRemoteGattCharacteristicChromeOS::OnError,
                  weak_ptr_factory_.GetWeakPtr(),
-                 callback, error_callback));
+                 error_callback));
+}
+
+void BluetoothRemoteGattCharacteristicChromeOS::GattCharacteristicValueUpdated(
+    const dbus::ObjectPath& object_path,
+    const std::vector<uint8>& value) {
+  if (object_path != object_path_)
+    return;
+
+  cached_value_ = value;
+
+  VLOG(1) << "GATT characteristic value has changed: " << object_path.value()
+          << ": " << value;
+  DCHECK(service_);
+  service_->NotifyCharacteristicValueChanged(this, value);
 }
 
 void BluetoothRemoteGattCharacteristicChromeOS::GattDescriptorAdded(
@@ -287,36 +292,25 @@ void BluetoothRemoteGattCharacteristicChromeOS::GattDescriptorPropertyChanged(
       this, iter->second, properties->value.value());
 }
 
-void BluetoothRemoteGattCharacteristicChromeOS::OnGetValue(
+void BluetoothRemoteGattCharacteristicChromeOS::OnValueSuccess(
     const ValueCallback& callback,
-    const ErrorCallback& error_callback,
-    bool success) {
-  if (!success) {
-    VLOG(1) << "Failed to read the value from the remote characteristic.";
-    error_callback.Run();
-    return;
-  }
+    const std::vector<uint8>& value) {
+  VLOG(1) << "Characteristic value read: " << value;
+  cached_value_ = value;
 
-  VLOG(1) << "Read value of remote characteristic.";
-  BluetoothGattCharacteristicClient::Properties* properties =
-      DBusThreadManager::Get()->GetBluetoothGattCharacteristicClient()->
-          GetProperties(object_path_);
-  DCHECK(properties);
-  callback.Run(properties->value.value());
+  DCHECK(service_);
+  service_->NotifyCharacteristicValueChanged(this, cached_value_);
+
+  callback.Run(value);
 }
 
-void BluetoothRemoteGattCharacteristicChromeOS::OnSetValue(
-    const base::Closure& callback,
+void BluetoothRemoteGattCharacteristicChromeOS::OnError(
     const ErrorCallback& error_callback,
-    bool success) {
-  if (!success) {
-    VLOG(1) << "Failed to write the value of remote characteristic.";
-    error_callback.Run();
-    return;
-  }
-
-  VLOG(1) << "Wrote value of remote characteristic.";
-  callback.Run();
+    const std::string& error_name,
+    const std::string& error_message) {
+  VLOG(1) << "Operation failed: " << error_name << ", message: "
+          << error_message;
+  error_callback.Run();
 }
 
 }  // namespace chromeos