[Easy Unlock] Port the BluetoothConnection class to native code.

components/proximity_auth/bluetooth_connection.cc

+// 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 "components/proximity_auth/bluetooth_connection.h"
+
+#include "base/bind.h"
+#include "base/message_loop/message_loop.h"
+#include "base/numerics/safe_conversions.h"
+#include "components/proximity_auth/bluetooth_util.h"
+#include "components/proximity_auth/remote_device.h"
+#include "components/proximity_auth/wire_message.h"
+#include "device/bluetooth/bluetooth_adapter_factory.h"
+#include "device/bluetooth/bluetooth_device.h"
+#include "net/base/io_buffer.h"
+
+namespace proximity_auth {
+namespace {
+const int kReceiveBufferSizeBytes = 1024;
+}
+
+BluetoothConnection::BluetoothConnection(const RemoteDevice& remote_device,
+                                         const device::BluetoothUUID& uuid)
+    : Connection(remote_device), uuid_(uuid), weak_ptr_factory_(this) {
+}
+
+BluetoothConnection::~BluetoothConnection() {
+  Disconnect();
+}
+
+void BluetoothConnection::Connect() {
+  if (status() != DISCONNECTED) {
+    VLOG(1)
+        << "[BC] Ignoring attempt to connect a non-disconnected connection.";
+    return;
+  }
+
+  if (!device::BluetoothAdapterFactory::IsBluetoothAdapterAvailable()) {
+    VLOG(1)
+        << "[BC] Connection failed: Bluetooth is unsupported on this platform.";
+    return;
+  }
+
+  SetStatus(IN_PROGRESS);
+  device::BluetoothAdapterFactory::GetAdapter(
+      base::Bind(&BluetoothConnection::OnAdapterInitialized,
+                 weak_ptr_factory_.GetWeakPtr()));
+}
+
+void BluetoothConnection::Disconnect() {
+  if (status() == DISCONNECTED) {
+    VLOG(1)
+        << "[BC] Ignoring attempt to disconnect a non-connected connection.";
+    return;
+  }
+
+  // Set status as disconnected now, rather than after the socket closes, so
+  // this connection is not reused.
+  SetStatus(DISCONNECTED);
+  if (socket_.get()) {
+    socket_->Disconnect(base::Bind(&base::DoNothing));
+    socket_ = NULL;
+  }
+  if (adapter_.get()) {
+    adapter_->RemoveObserver(this);
+    adapter_ = NULL;
+  }
+}
+
+void BluetoothConnection::SendMessageImpl(scoped_ptr<WireMessage> message) {
+  DCHECK_EQ(status(), CONNECTED);
+
+  // Serialize the message.
+  std::string serialized_message = message->Serialize();
+  int message_length = base::checked_cast<int>(serialized_message.size());
+  scoped_refptr<net::IOBuffer> buffer = new net::IOBuffer(message_length);
+  memcpy(buffer->data(), serialized_message.c_str(), message_length);
+
+  // Send it.
+  pending_message_ = message.Pass();
+  base::WeakPtr<BluetoothConnection> weak_this = weak_ptr_factory_.GetWeakPtr();
+  socket_->Send(buffer,
+                message_length,
+                base::Bind(&BluetoothConnection::OnSend, weak_this),
+                base::Bind(&BluetoothConnection::OnSendError, weak_this));
+}
+
+void BluetoothConnection::DeviceRemoved(device::BluetoothAdapter* adapter,
+                                        device::BluetoothDevice* device) {
+  DCHECK_EQ(adapter, adapter_.get());
+  if (device->GetAddress() != remote_device().bluetooth_address)
+    return;
+
+  DCHECK_NE(status(), DISCONNECTED);
+  VLOG(1) << "[BC] Device disconnected...";
+  Disconnect();
+}
+
+void BluetoothConnection::ConnectToService(
+    device::BluetoothDevice* device,
+    const device::BluetoothUUID& uuid,
+    const device::BluetoothDevice::ConnectToServiceCallback& callback,
+    const device::BluetoothDevice::ConnectToServiceErrorCallback&
+        error_callback) {
+  bluetooth_util::ConnectToServiceInsecurely(
+      device, uuid, callback, error_callback);
+}
+
+void BluetoothConnection::StartReceive() {
+  base::WeakPtr<BluetoothConnection> weak_this = weak_ptr_factory_.GetWeakPtr();
+  socket_->Receive(kReceiveBufferSizeBytes,
+                   base::Bind(&BluetoothConnection::OnReceive, weak_this),
+                   base::Bind(&BluetoothConnection::OnReceiveError, weak_this));
+}
+
+void BluetoothConnection::OnAdapterInitialized(
+    scoped_refptr<device::BluetoothAdapter> adapter) {
+  const std::string address = remote_device().bluetooth_address;
+  device::BluetoothDevice* bluetooth_device = adapter->GetDevice(address);
+  if (!bluetooth_device) {
+    VLOG(1) << "[BC] Device with address " << address
+            << " is not known to the system Bluetooth daemon.";
+    Disconnect();
+    return;
+  }
+
+  adapter_ = adapter;
+  adapter_->AddObserver(this);
+
+  base::WeakPtr<BluetoothConnection> weak_this = weak_ptr_factory_.GetWeakPtr();
+  ConnectToService(
+      bluetooth_device,
+      uuid_,
+      base::Bind(&BluetoothConnection::OnConnected, weak_this),
+      base::Bind(&BluetoothConnection::OnConnectionError, weak_this));
+}
+
+void BluetoothConnection::OnConnected(
+    scoped_refptr<device::BluetoothSocket> socket) {
+  if (status() != IN_PROGRESS) {
+    // This case is reachable if the client of |this| connection called
+    // |Disconnect()| while the backing Bluetooth connection was pending.
+    DCHECK_EQ(status(), DISCONNECTED);
+    VLOG(1) << "[BC] Ignoring successful backend Bluetooth connection to an "
+            << "already disconnected logical connection.";
+    return;
+  }
+
+  VLOG(1) << "[BC] Connection established with "
+          << remote_device().bluetooth_address;
+  socket_ = socket;
+  SetStatus(CONNECTED);
+  StartReceive();
+}
+
+void BluetoothConnection::OnConnectionError(const std::string& error_message) {
+  VLOG(1) << "[BC] Connection failed: " << error_message;
+  Disconnect();
+}
+
+void BluetoothConnection::OnSend(int bytes_sent) {
+  VLOG(1) << "[BC] Successfully sent " << bytes_sent << " bytes.";
+  OnDidSendMessage(*pending_message_, true);
+  pending_message_.reset();
+}
+
+void BluetoothConnection::OnSendError(const std::string& error_message) {
+  VLOG(1) << "[BC] Error when sending bytes: " << error_message;
+  OnDidSendMessage(*pending_message_, false);
+  pending_message_.reset();
+
+  Disconnect();
+}
+
+void BluetoothConnection::OnReceive(int bytes_received,
+                                    scoped_refptr<net::IOBuffer> buffer) {
+  VLOG(1) << "[BC] Received " << bytes_received << " bytes.";
+  OnBytesReceived(std::string(buffer->data(), bytes_received));
+
+  // Post a task to delay the read until the socket is available, as
+  // calling StartReceive at this point would error with ERR_IO_PENDING.
+  base::MessageLoop::current()->PostTask(
+      FROM_HERE,
+      base::Bind(&BluetoothConnection::StartReceive,
+                 weak_ptr_factory_.GetWeakPtr()));
+}
+
+void BluetoothConnection::OnReceiveError(
+    device::BluetoothSocket::ErrorReason error_reason,
+    const std::string& error_message) {
+  VLOG(1) << "[BC] Error receiving bytes: " << error_message;
+
+  // Post a task to delay the read until the socket is available, as
+  // calling StartReceive at this point would error with ERR_IO_PENDING.
+  base::MessageLoop::current()->PostTask(
+      FROM_HERE,
+      base::Bind(&BluetoothConnection::StartReceive,
+                 weak_ptr_factory_.GetWeakPtr()));
+}
+
+}  // namespace proximity_auth