source: osgVisual/src/cluster/dataIO_clusterENet_implementation.cpp @ 67

#include "dataIO_clusterENet_implementation.h"

using namespace osgVisual;

int dataIO_clusterENet_implementation::activeENetInstances = 0;

dataIO_clusterENet_implementation::dataIO_clusterENet_implementation()
{
        std::cout << "Instantiated server class# "<< activeENetInstances << std::endl;
        serverInitialized = false;
        host = NULL;
        // Start ENet
        if (activeENetInstances++ == 0)
        {
                if( enet_initialize() != 0)
                {
                        std::cout <<  "An error occurred while initializing ENet." << std::endl;
                }
                else
                {
                        std::cout << "Starting ENet subsystem successful" << std::endl;
                }
        }
}

dataIO_clusterENet_implementation::~dataIO_clusterENet_implementation()
{
        // Delete Host Object if instantiated
        if(host)
                enet_host_destroy(host);

        // Stop ENet if it is the last element.
        if(--activeENetInstances == 0)
        {
                std::cout << "Close ENet subsystem" << std::endl;
                enet_deinitialize();
        }
        std::cout << "Destroyed server class# "<< activeENetInstances << std::endl;
}

bool dataIO_clusterENet_implementation::init(dataIO_clusterENet_implementation::role role_, unsigned short port_, int maxClients_, int maxChannels_, int maxInBandwidth_, int maxOutBandwidth_)
{
        port = port_;
        currentRole = role_;

        if(currentRole == dataIO_clusterENet_implementation::SERVER)
        {
                /* Bind the server to the default localhost.     */
                /* A specific host address can be specified by   */
                /* enet_address_set_host (& address, "x.x.x.x"); */

                address.host = ENET_HOST_ANY;
                /* Bind the server to port. */
                address.port = port;

                host = enet_host_create (& address /* the address to bind the server host to */, 
                                                                         maxClients_      /* allow up to 32 clients and/or outgoing connections */,
                                                                         maxChannels_      /* allow up to 2 channels to be used, 0 and 1 */,
                                                                         maxInBandwidth_      /* assume any amount of incoming bandwidth */,
                                                                         maxOutBandwidth_      /* assume any amount of outgoing bandwidth */);
                if (host == NULL)
                {
                        std::cout <<  "An error occurred while trying to create an ENet server." << std::endl;
                        return false;
                }
        }       // IF SERVER END

        if(currentRole == dataIO_clusterENet_implementation::CLIENT)
        {
                 host = enet_host_create (NULL /* create a client host */,
                                                                         maxClients_      /* allow up to 32 clients and/or outgoing connections */,
                                                                         maxChannels_      /* allow up to 2 channels to be used, 0 and 1 */,
                                                                         maxInBandwidth_      /* assume any amount of incoming bandwidth */,
                                                                         maxOutBandwidth_      /* assume any amount of outgoing bandwidth */);
                 if (host == NULL)
                {
                        std::cout <<  "An error occurred while trying to create an ENet client." << std::endl;
                        return false;
                }

        }       // IF CLIENT END

        serverInitialized = true;
        return true;
}

void dataIO_clusterENet_implementation::processEvents(int timeout_ms_)
{
        if(!serverInitialized)
                return;

        ENetEvent event;
        while(enet_host_service (host, & event, timeout_ms_) > 0)
        {
                switch (event.type)
                {
                        case ENET_EVENT_TYPE_CONNECT:
                                onConnect(&event);
                                break;

                        case ENET_EVENT_TYPE_RECEIVE:
                                onReceivePacket(&event);
                        
                                /* Clean up the packet now that we're done using it. */
                                enet_packet_destroy (event.packet);
                                break;

                        case ENET_EVENT_TYPE_DISCONNECT:
                                onDisconnect(&event);
                                break;
                        
                        case ENET_EVENT_TYPE_NONE:
                                // nothing to do
                                break;

                        default: 
                                std::cout << "Unknown Eventtype" << std::endl;
                }       // SWITCH CASE END
        }       // WHILE EVENT END

}

void dataIO_clusterENet_implementation::sendPacket( ENetPacket* packet_, enet_uint8 channelID_, unsigned int peerID_, bool autoFlush_ )
{
        // are connected peers available?
        if( peerList.size() == 0 )
        {
                std::cout << "dataIO_clusterENet_implementation::sendPacket() - ERROR: No connected peer available!" << std::endl;
                return;
        }

        // Client
        if(currentRole == dataIO_clusterENet_implementation::CLIENT)
        {
                enet_peer_send (peerList[0], channelID_, packet_);
        }

        // Server
        if(currentRole == dataIO_clusterENet_implementation::SERVER)
        {
                if(peerID_ < peerList.size())
                        enet_peer_send (peerList[peerID_], channelID_, packet_);
                else
                        std::cout << "dataIO_clusterENet_implementation::sendPacket() - ERROR: Peer #"<<peerID_<<" is not available, only peers 0-"<<(peerList.size()-1)<<" are connected!" << std::endl;
        }

        if(autoFlush_)
                enet_host_flush( host );
}

void dataIO_clusterENet_implementation::sendPacket( ENetPacket* packet_, enet_uint8 channelID_, std::string peerName_, bool autoFlush_ )
{
                // are connected peers available?
        if( peerList.size() == 0 )
        {
                std::cout << "dataIO_clusterENet_implementation::sendPacket() - ERROR: No connected peer available!" << std::endl;
                return;
        }

        // Client
        if(currentRole == dataIO_clusterENet_implementation::CLIENT)
        {
                enet_peer_send (peerList[0], channelID_, packet_);
        }

        // Server
        if(currentRole == dataIO_clusterENet_implementation::SERVER)
        {
                int peerID_=-1;
                for(unsigned int i=0;i<peerList.size();i++)     // Search peer
                {
                        if( *((std::string*)peerList[i]->data) == peerName_ )
                        {
                                peerID_ = i;
                                break;
                        }
                }
                if( peerID_ >= 0 && peerID_ < (int)peerList.size())
                        enet_peer_send (peerList[peerID_], channelID_, packet_);
                else
                        std::cout << "dataIO_clusterENet_implementation::sendPacket() - ERROR: Peer #"<<peerID_<<" is not available, only peers 0-"<<(peerList.size()-1)<<" are connected!" << std::endl;
        }

        if(autoFlush_)
                enet_host_flush( host );
}

void dataIO_clusterENet_implementation::broadcastPacket( enet_uint8 channelID_, ENetPacket* packet_, bool autoFlush_ )
{
        if(currentRole != dataIO_clusterENet_implementation::SERVER)
                return;

        enet_host_broadcast( host, channelID_, packet_ );
        if(autoFlush_)
                enet_host_flush( host );
}

bool dataIO_clusterENet_implementation::connectTo( const char* remoteAddr_, int connectTimeout_ms_, int clientInfo_,  int channelToAlloc_ )
{
        if(currentRole != dataIO_clusterENet_implementation::CLIENT)
                return false;

        ENetAddress address;
        enet_address_set_host (& address, remoteAddr_);
    address.port = port;

        
        ENetPeer* tmpPeer = enet_host_connect( host, &address, channelToAlloc_, clientInfo_ );    // host, remote address, number of channels, describing data.
   
    if (tmpPeer == NULL)
    {
                std::cout << "No available peers for initiating an ENet connection." << std::endl;
       return false;
    }
    
    /* Wait up to 5 seconds for the connection attempt to succeed. */
    if (enet_host_service (host, & event, connectTimeout_ms_) > 0
                && event.type == ENET_EVENT_TYPE_CONNECT)
    {
                peerList.push_back( tmpPeer );
                std::cout << "Connection to " << remoteAddr_ << ":"<<port<<" succeeded." << std::endl;
                // Note down peers remote IP.
                char *hostIP = new char[20];
                enet_address_get_host_ip( &address, hostIP, 20 );
                tmpPeer->data = hostIP;

                return true;
    }
    else
    {
        /* Either the n seconds are up or a disconnect event was */
        /* received. Reset the peer in the event the n seconds   */
        /* had run out without any significant event.            */
        enet_peer_reset (tmpPeer);

                std::cout << "Connection to " << remoteAddr_ << ":"<<port<<" failed." << std::endl;
                return false;
    }
}

void dataIO_clusterENet_implementation::onReceivePacket(ENetEvent* event_)
{
                std::string datastring;
                datastring.assign((char*)(event_->packet->data), event_->packet->dataLength);   
                std::cout << "A packet of length "<<event_->packet->dataLength<<" containing "<<datastring<<" was received from "<<datastring<<" on channel "<<(int)(event_->channelID)<<std::endl;
                datastring+=std::string("answer");

                ENetPacket * packet = enet_packet_create (datastring.c_str(), 
                                                                                                  datastring.size(), 
                                                                                                  ENET_PACKET_FLAG_RELIABLE);
                
                // Send answer
                sendPacket( packet, 0, 0, true);
}

void dataIO_clusterENet_implementation::onConnect(ENetEvent* event_)
{
        /* Get connect remote IP */
        char *hostIP = new char[20];
        enet_address_get_host_ip(&(event_->peer->address), hostIP, 20);

        /* debug output */
        std::cout << "A new client connected from "<<hostIP<<"." << std::endl; 
                
        /* Store any relevant client information here. */
        event_->peer ->data = hostIP;   

        /* note peer for duplex usage of the connection */
        peerList.push_back(event_->peer);       
}

void dataIO_clusterENet_implementation::onDisconnect(ENetEvent* event_)
{
        // remove peer pionter from peerList
        int foundOn = -1;
        for(unsigned int i=0;i<peerList.size();i++)
        {
                if(peerList[0] == event_->peer)
                {
                        peerList.erase(peerList.begin()+i);
                        break;
                }
        }


        if(currentRole == dataIO_clusterENet_implementation::SERVER)
        {
                std::cout << "Client " << (char*)event_->peer->data << " disconnected." << std::endl;

                /* Reset the peer's client information. */
                delete event_->peer->data;
                event_->peer->data = NULL;
        }

        if(currentRole == dataIO_clusterENet_implementation::CLIENT)
        {
                std::cout << "Server "<< (char*)event_->peer->data<<"disconnected." << std::endl;

                // Reset the server information
                delete event_->peer->data;
                event_->peer->data = NULL;
        }
}