Rewrite dbus code using sdbus-c++

internal/platform/implementation/linux/bluetooth_classic_socket.h

@@ -2,7 +2,9 @@
 #define PLATFORM_IMPL_LINUX_BLUETOOTH_SOCKET_H_
 
 #include <memory>
+#include <optional>
 
+#include <sdbus-c++/Types.h>
 #include <systemd/sd-bus.h>
 
 #include "internal/platform/byte_array.h"
@@ -14,7 +16,7 @@ namespace linux {
 
 class BluetoothInputStream : public InputStream {
 public:
-  BluetoothInputStream(int fd) { fd_ = fd; };
+  BluetoothInputStream(sdbus::UnixFd &fd) : fd_(fd){};
 
   ExceptionOr<ByteArray> Read(std::int64_t size) override;
   ExceptionOr<size_t> Skip(size_t offset) override;
@@ -23,33 +25,29 @@ public:
   Exception Close() override;
 
 private:
-  int fd_;
+  friend class BluetoothSocket;
+
+  std::optional<sdbus::UnixFd> fd_;
 };
 
 class BluetoothOutputStream : public OutputStream {
 public:
-  BluetoothOutputStream(int fd) { fd_ = fd; };
+  BluetoothOutputStream(sdbus::UnixFd &fd) : fd_(fd){};
 
   Exception Write(const ByteArray &data) override;
   Exception Flush() override;
   Exception Close() override;
 
 private:
-  int fd_;
+  friend class BluetoothSocket;
+
+  std::optional<sdbus::UnixFd> fd_;
 };
 
 class BluetoothSocket : public api::BluetoothSocket {
 public:
-  BluetoothSocket(api::BluetoothDevice &device,
-                  absl::string_view device_object_path,
-                  absl::string_view connected_profile_uuid, int fd)
-      : device_(device) {
-    fd_ = fd;
-    device_object_path_ = device_object_path;
-    connected_profile_uuid_ = connected_profile_uuid;
-    input_stream_ = BluetoothInputStream(fd_);
-    output_stream_ = BluetoothOutputStream(fd_);
-  }
+  BluetoothSocket(api::BluetoothDevice &device, sdbus::UnixFd fd)
+      : device_(device), output_stream_(fd), input_stream_(fd) {}
 
   InputStream &GetInputStream() override { return input_stream_; }
   OutputStream &GetOutputStream() override { return output_stream_; }
@@ -57,12 +55,9 @@ public:
   api::BluetoothDevice *GetRemoteDevice() override { return &device_; };
 
 private:
-  int fd_;
-  std::string device_object_path_;
   api::BluetoothDevice &device_;
-  std::string connected_profile_uuid_;
-  BluetoothInputStream input_stream_ = {-1};
-  BluetoothOutputStream output_stream_ = {-1};
+  BluetoothOutputStream output_stream_;
+  BluetoothInputStream input_stream_;
 };
 } // namespace linux
 } // namespace nearby