source: code/branches/tutorial/src/network/ClientConnection.cc @ 2103

/*
*   ORXONOX - the hottest 3D action shooter ever to exist
*
*
*   License notice:
*
*   This program is free software; you can redistribute it and/or
*   modify it under the terms of the GNU General Public License
*   as published by the Free Software Foundation; either version 2
*   of the License, or (at your option) any later version.
*
*   This program is distributed in the hope that it will be useful,
*   but WITHOUT ANY WARRANTY; without even the implied warranty of
*   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
*   GNU General Public License for more details.
*
*   You should have received a copy of the GNU General Public License
*   along with this program; if not, write to the Free Software
*   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
*
*   Author:
*      Oliver Scheuss, (C) 2007
*   Co-authors:
*      ...
*
*/

//
// C++ Interface: ClientConnection
//
// Description: The Class ClientConnection manages the servers conenctions to the clients.
// each connection is provided by a new process. communication between master process and
// connection processes is provided by ...
//
//
// Author:  Oliver Scheuss
//

#include <iostream>
// boost.thread library for multithreading support
#include <boost/thread/thread.hpp>
#include <boost/bind.hpp>

#include "util/Sleep.h"
#include "ClientConnection.h"

namespace network
{
  static boost::thread_group network_threads;

  ClientConnection::ClientConnection(int port, std::string address) {
    quit=false;
    server=NULL;
    enet_address_set_host(&serverAddress, address.c_str());
    serverAddress.port = NETWORK_PORT;
    established=false;
  }

  ClientConnection::ClientConnection(int port, const char *address) {
    quit=false;
    server=NULL;
    enet_address_set_host(&serverAddress, address);
    serverAddress.port = NETWORK_PORT;
    established=false;
  }

  bool ClientConnection::waitEstablished(int milisec) {
    for(int i=0; i<=milisec && !established; i++)
      usleep(1000);

    return established;
  }


  ENetPacket *ClientConnection::getPacket(ENetAddress &address) {
    if(!buffer.isEmpty()) {
      //std::cout << "###BUFFER IS NOT EMPTY###" << std::endl;
      return buffer.pop(address);
    }
    else{
      return NULL;
    }
  }

  ENetPacket *ClientConnection::getPacket() {
    ENetAddress address;
    return getPacket(address);
  }

  bool ClientConnection::queueEmpty() {
    return buffer.isEmpty();
  }

  bool ClientConnection::createConnection() {
    network_threads.create_thread(boost::bind(boost::mem_fn(&ClientConnection::receiverThread), this));
    // wait 10 seconds for the connection to be established
    return waitEstablished(10000);
  }

  bool ClientConnection::closeConnection() {
    quit=true;
    network_threads.join_all();
    established=false;
    return true;
  }


  bool ClientConnection::addPacket(ENetPacket *packet) {
    if(server==NULL)
      return false;
    if(enet_peer_send(server, 1, packet)!=0)
      return false;
    return true;
  }

  bool ClientConnection::sendPackets(ENetEvent *event) {
    if(server==NULL)
      return false;
    if(enet_host_service(client, event, NETWORK_SEND_WAIT)>=0){
      return true;}
    else
      return false;
  }

  bool ClientConnection::sendPackets() {
    ENetEvent event;
    if(server==NULL)
      return false;
    if(enet_host_service(client, &event, NETWORK_SEND_WAIT)>=0){
      return true;}
    else
      return false;
  }

  void ClientConnection::receiverThread() {
    // what about some error-handling here ?
    enet_initialize();
    atexit(enet_deinitialize);
    ENetEvent event;
    client = enet_host_create(NULL, NETWORK_CLIENT_MAX_CONNECTIONS, 0, 0);
    if(client==NULL)
      // add some error handling here ==========================
      quit=true;
    //connect to the server
    if(!establishConnection()){
      quit=true;
      return;
    }
    //main loop
    while(!quit){
      //std::cout << "connection loop" << std::endl;
      if(enet_host_service(client, &event, NETWORK_CLIENT_TIMEOUT)<0){
        // we should never reach this point
        quit=true;
        // add some error handling here ========================
      }
      switch(event.type){
        // log handling ================
      case ENET_EVENT_TYPE_CONNECT:
      case ENET_EVENT_TYPE_RECEIVE:
        //std::cout << "got packet" << std::endl;
        processData(&event);
        break;
      case ENET_EVENT_TYPE_DISCONNECT:
        quit=true;
        // server closed the connection
        return;
        break;
      case ENET_EVENT_TYPE_NONE:
        continue;
      }
    }
    // now disconnect

    if(!disconnectConnection())
      // if disconnecting failed destroy conn.
      enet_peer_reset(server);
    return;
  }

  bool ClientConnection::disconnectConnection() {
    ENetEvent event;
    enet_peer_disconnect(server, 0);
    while(enet_host_service(client, &event, NETWORK_CLIENT_TIMEOUT) > 0){
      switch (event.type)
      {
      case ENET_EVENT_TYPE_NONE:
      case ENET_EVENT_TYPE_CONNECT:
      case ENET_EVENT_TYPE_RECEIVE:
        enet_packet_destroy(event.packet);
        break;
      case ENET_EVENT_TYPE_DISCONNECT:
        return true;
      }
    }
    enet_peer_reset(server);
    return false;
  }

  bool ClientConnection::establishConnection() {
    ENetEvent event;
    // connect to peer
    server = enet_host_connect(client, &serverAddress, NETWORK_CLIENT_CHANNELS);
    if(server==NULL)
      // error handling
      return false;
    // handshake
    if(enet_host_service(client, &event, NETWORK_CLIENT_TIMEOUT)>0 && event.type == ENET_EVENT_TYPE_CONNECT){
      established=true;
      return true;
    }
    else
      return false;
  }

  bool ClientConnection::processData(ENetEvent *event) {
    //std::cout << "got packet, pushing to queue" << std::endl;
    // just add packet to the buffer
    // this can be extended with some preprocessing
    return buffer.push(event);
  }

}