Connection.h
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/*
* Copyright (c) TrueBrain
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
#pragma once
#include "TrueMQTT.h"
#include <string>
#include <map>
#include <netdb.h>
#include <thread>
#include <vector>
// Some definitions to make future cross-platform work easier.
#define SOCKET int
#define INVALID_SOCKET -1
#define closesocket close
class Connection
{
public:
Connection(TrueMQTT::Client::LogLevel log_level,
const std::function<void(TrueMQTT::Client::LogLevel, std::string)> logger,
const std::function<void(TrueMQTT::Client::Error, std::string)> error_callback,
const std::function<void(bool)> connection_change_callback,
const std::string &host,
int port);
~Connection();
private:
void run();
void resolve();
bool try_next_address();
void connect(addrinfo *address);
bool connect_to_any();
std::string addrinfo_to_string(addrinfo *address);
enum class State
{
RESOLVING,
CONNECTING,
CONNECTED,
BACKOFF,
};
TrueMQTT::Client::LogLevel log_level;
const std::function<void(TrueMQTT::Client::LogLevel, std::string)> logger;
const std::function<void(TrueMQTT::Client::Error, std::string)> m_error_callback;
const std::function<void(bool)> m_connection_change_callback;
const std::string &m_host; ///< The hostname or IP address to connect to.
int m_port; ///< The port to connect to.
State m_state = State::RESOLVING;
std::thread m_thread; ///< Current thread used to run this connection.
addrinfo *m_host_resolved = nullptr; ///< Address info of the hostname, once looked up.
std::vector<addrinfo *> m_addresses = {}; ///< List of addresses to try to connect to.
size_t m_address_current = 0; ///< Index of the address we are currently trying to connect to.
std::chrono::steady_clock::time_point m_last_attempt = {}; ///< Time of the last attempt to connect to the current address.
std::vector<SOCKET> m_sockets = {}; ///< List of sockets we are currently trying to connect to.
std::map<SOCKET, addrinfo *> m_socket_to_address = {}; ///< Map of sockets to the address they are trying to connect to.
SOCKET m_socket = INVALID_SOCKET; ///< The socket we are currently connected with, or INVALID_SOCKET if not connected.
};