host/frontend/vnc_server/tcp_socket.h

#ifndef DEVICE_GOOGLE_GCE_GCE_UTILS_GCE_VNC_SERVER_TCPSOCKET_H_
#define DEVICE_GOOGLE_GCE_GCE_UTILS_GCE_VNC_SERVER_TCPSOCKET_H_

#include "vnc_utils.h"

#include <cstddef>
#include <cstdint>
#include <mutex>

#include <unistd.h>

namespace avd {
namespace vnc {

class ServerSocket;

// Recv and Send wait until all data has been received or sent.
// Send is thread safe in this regard, Recv is not.
class ClientSocket {
 public:
  ClientSocket(ClientSocket&& other) : fd_{other.fd_} {}

  ClientSocket& operator=(ClientSocket&& other) {
    fd_ = other.fd_;
    return *this;
  }

  ClientSocket(const ClientSocket&) = delete;
  ClientSocket& operator=(const ClientSocket&) = delete;

  Message Recv(std::size_t length);
  ssize_t Send(const std::uint8_t* data, std::size_t size);
  ssize_t Send(const Message& message);

  template <std::size_t N>
  ssize_t Send(const std::uint8_t (&data)[N]) {
    return Send(data, N);
  }

  bool closed() const { return other_side_closed_; }

 private:
  friend ServerSocket;
  explicit ClientSocket(avd::SharedFD fd) : fd_(fd) {}

  avd::SharedFD fd_;
  bool other_side_closed_{};
  std::mutex send_lock_;
};

class ServerSocket {
 public:
  explicit ServerSocket(int port);

  ServerSocket(const ServerSocket&) = delete;
  ServerSocket& operator=(const ServerSocket&) = delete;

  ClientSocket Accept();

 private:
  avd::SharedFD fd_;
};

}  // namespace vnc
}  // namespace avd

#endif