tcp_client.hpp

// MIT License
//
// Copyright (c) 2016-2017 Simon Ninon <simon.ninon@gmail.com>
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

#pragma once

#include <atomic>
#include <cstdint>
#include <mutex>
#include <queue>
#include <string>

#include <tacopie/network/io_service.hpp>
#include <tacopie/network/tcp_socket.hpp>
#include <tacopie/utils/typedefs.hpp>

namespace tacopie {

class tcp_client {
public:
  tcp_client(void);
  ~tcp_client(void);

  explicit tcp_client(tcp_socket&& socket);

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

public:
  bool operator==(const tcp_client& rhs) const;

  bool operator!=(const tcp_client& rhs) const;

public:
  const std::string& get_host(void) const;

  std::uint32_t get_port(void) const;

public:
  void connect(const std::string& host, std::uint32_t port, std::uint32_t timeout_msecs = 0);

  void disconnect(bool wait_for_removal = false);

  bool is_connected(void) const;

private:
  void call_disconnection_handler(void);

public:
  struct read_result {
    bool success;
    std::vector<char> buffer;
  };

  struct write_result {
    bool success;
    std::size_t size;
  };

public:
  typedef std::function<void(read_result&)> async_read_callback_t;

  typedef std::function<void(write_result&)> async_write_callback_t;

public:
  struct read_request {
    std::size_t size;
    async_read_callback_t async_read_callback;
  };

  struct write_request {
    std::vector<char> buffer;
    async_write_callback_t async_write_callback;
  };

public:
  void async_read(const read_request& request);

  void async_write(const write_request& request);

public:
  tacopie::tcp_socket& get_socket(void);

  const tacopie::tcp_socket& get_socket(void) const;

public:
  const std::shared_ptr<tacopie::io_service>& get_io_service(void) const;

public:
  typedef std::function<void()> disconnection_handler_t;

  void set_on_disconnection_handler(const disconnection_handler_t& disconnection_handler);

private:
  void on_read_available(fd_t fd);

  void on_write_available(fd_t fd);

private:
  void clear_read_requests(void);

  void clear_write_requests(void);

private:
  async_read_callback_t process_read(read_result& result);

  async_write_callback_t process_write(write_result& result);

private:
  std::shared_ptr<io_service> m_io_service;

  tacopie::tcp_socket m_socket;

  std::atomic<bool> m_is_connected = ATOMIC_VAR_INIT(false);

  std::queue<read_request> m_read_requests;
  std::queue<write_request> m_write_requests;

  std::mutex m_read_requests_mtx;
  std::mutex m_write_requests_mtx;

  disconnection_handler_t m_disconnection_handler;
};

} // namespace tacopie