UdpLogger.h

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// Copyright CERN 2012 - Developed in collaboration with GSI
//
// UdpLogger.h: interface of a simple UDP Logger object.
//
//
// Author: FESA team
//
//  May 2007
//      - added to the FESA Framework for the DIAGNOSTIC protoyping
//
#ifndef __UdpLogger__H__
#define __UdpLogger__H__

#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>
#include <fcntl.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <errno.h>
#include <fesa-core/Exception/FesaException.h>

//UDP frame cannot exceed 8Kb.
//Loop is required for large udp frame (ie: diagnostic Config/State)
#define MAX_UDP_SEND_SIZE       8000 //less than (8*1024) just for security
namespace fesa
{

    class UdpLogger
    {

        private:
            // UDP socket
            int32_t udpSock;
            // UDP attributes
            struct sockaddr_in udpAttr;
            //connected mode = true: to receive ICMP "not reachable" if nobody is listening
            bool udpConn;

        public:
            UdpLogger(const char* hostname, unsigned short& port, const bool connectMode);
            ~UdpLogger();

            /* Send string message to UPD channel
             * . for perfomance aspect, the UdpLogger is not thread safe, it does not use synchonization mechanism.
             * . it's recommended to limit the message size to the network MTU (1480 bytes for Ethernet)
             * return -1 on failure (no listener)
             */
            int32_t sendStr(const char* msg);

    };
}

#endif // __UdpLogger__H__