tcp_client.cpp

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/*
 * Software License Agreement (BSD License)
 *
 * Copyright (c) 2011, Southwest Research Institute
 * Copyright (c) 2019, READY Robotics Corporation
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *      * Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *      * Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in the
 *      documentation and/or other materials provided with the distribution.
 *      * Neither the name of the Southwest Research Institute, nor the names
 *      of its contributors may be used to endorse or promote products derived
 *      from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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#ifndef FLATHEADERS
#include "simple_message/socket/tcp_client.h"
#include "simple_message/log_wrapper.h"
#else
#include "tcp_client.h"
#include "log_wrapper.h"
#endif

namespace industrial
{
namespace tcp_client
{

TcpClient::TcpClient()
{

}

TcpClient::~TcpClient()
{
  LOG_DEBUG("Destructing TCPClient");
}

bool TcpClient::init(char *buff, int port_num)
{
  addrinfo *result;
  addrinfo hints = {};

  if (!connectSocketHandle())
  {
    return false;
  }

  // Initialize address data structure
  memset(&this->sockaddr_, 0, sizeof(this->sockaddr_));
  this->sockaddr_.sin_family = AF_INET;


  // Check for 'buff' as hostname, and use that, otherwise assume IP address
  hints.ai_family = AF_INET;  // Allow IPv4
  hints.ai_socktype = SOCK_STREAM;  // TCP socket
  hints.ai_flags = 0;  // No flags
  hints.ai_protocol = 0;  // Any protocol
  hints.ai_canonname = NULL;
  hints.ai_addr = NULL;
  hints.ai_next = NULL;
  if (0 == GETADDRINFO(buff, NULL, &hints, &result))
  {
    this->sockaddr_ = *((sockaddr_in *)result->ai_addr);
  }
  else
  {
    this->sockaddr_.sin_addr.s_addr = INET_ADDR(buff);
  }
  this->sockaddr_.sin_port = HTONS(port_num);

  return true;
}

bool TcpClient::makeConnect()
{
  if (isConnected())
  {
    LOG_WARN("Tried to connect when socket already in connected state");
    return false;
  }

  if (!connectSocketHandle())
  {
    // Logging handled by connectSocketHandle()
    return false;
  }

  int rc = CONNECT(this->getSockHandle(), (sockaddr *)&sockaddr_, sizeof(sockaddr_));
  if (SOCKET_FAIL == rc)
  {
    logSocketError("Failed to connect to server", rc, errno);
    return false;
  }

  LOG_INFO("Connected to server");
  setConnected(true);

  return true;
}

bool TcpClient::connectSocketHandle()
{
  if (isConnected())
  {
    // Already connected, nothing to do
    return true;
  }

  int sock_handle = getSockHandle();

  if (sock_handle != SOCKET_FAIL)
  {
    // Handle is stale close old handle
    CLOSE(sock_handle);
  }

  sock_handle = SOCKET(AF_INET, SOCK_STREAM, 0);
  setSockHandle(sock_handle);
  if (SOCKET_FAIL == sock_handle)
  {
    LOG_ERROR("Failed to create socket");
    return false;
  }

  int disableNodeDelay = 1;
  // The set no delay disables the NAGEL algorithm
  if (SOCKET_FAIL == SET_NO_DELAY(sock_handle, disableNodeDelay))
  {
    LOG_WARN("Failed to set no socket delay, sending data can be delayed by up to 250ms");
  }
  return true;
}
} //tcp_client
} //industrial