G4FRClientServer.cc

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// $Id: G4FRClientServer.cc 81905 2014-06-06 13:57:45Z gcosmo $
//
// Satoshi TANAKA, Wed Jul  3 14:14:29 JST 1996


//=================//
#ifdef G4VIS_BUILD_DAWN_DRIVER
//=================//

#include "G4VisManager.hh"
#include "G4FRClientServer.hh"

// #define DEBUG_CLIENT_SERVER

#include<sys/param.h>

        //----- const   
const  char     DEFAULT_SUN_PATH[]              = "FR_TMP3"        ;
const  int      DEFAULT_PORT_NUMBER             = 40701            ;
//const  char   FR_ENV_SERVER_HOST_NAME[]       = "G4DAWN_HOST_NAME" ; // moved to .hh
const  int      MAX_CONNECT_TRIAL               = 10               ;
const  char     FR_DEFAULT_HOST_NAME[]          = "localhost"      ;      

        //----- G4FRClientServer::G4FRClientServer ()
G4FRClientServer::G4FRClientServer ( char terminator , char end_line ) :  
        TERMINATOR ( terminator ) , 
        END_OF_LINE( end_line   ) ,
        fSocketFd  ( -1 )           
{ 
        SetSunPath    ( DEFAULT_SUN_PATH ) ; // for Unix domain
        SetPortNumber ( DEFAULT_PORT_NUMBER ) ;
        ClearReceivedMessage () ;
}


        //----- G4FRClientServer::ConnectUnix()
int G4FRClientServer::ConnectUnix()
{
                //----- local
        int                     flag_connected = 0 ; 
        struct sockaddr_un      server_address ;

                //----- make socket
        fSocketFd = socket( AF_UNIX, SOCK_STREAM, 0 );
        if( fSocketFd < 0 ) { Err("G4FRClientServer::ConnectUnix(),socket"); }

                //----- set server address
        memset( (char *)&server_address, '\0', sizeof(server_address)) ;
        server_address.sun_family = AF_UNIX ;
        strcpy( server_address.sun_path, SUN_PATH );

                //----- connection
        int     connection_status = -1  ;
        int     num_trial         = 0 ;
        while( connection_status < 0 && num_trial <= MAX_CONNECT_TRIAL ) {
                num_trial++ ; 
                connection_status = connect( fSocketFd, (struct sockaddr * )(&server_address), sizeof( server_address ) ) ;
                if( connection_status  <0 ) 
                {
#if defined DEBUG_CLIENT_SERVER
                        Err("G4FRClientServer::ConnectUnix(),connect => RETRY");
#endif
                        flag_connected = 0 ;
                } else {
                        flag_connected = 1 ;
                        break ;
                }

                sleep(1);
                
        } // while(connection_status...)

                //----- return status of connection
        return flag_connected ;

} // G4FRClientServer::ConnectUnix()


        //----- G4FRClientServer::Receive()
void    G4FRClientServer::Receive()
{
                //-----
        ClearReceivedMessage () ;
        if( recv( fSocketFd, fReceivedMessage, G4FRClientServer::RECV_BUFMAX , 0 ) < 0 ) 
        {
                Err("G4FRClientServer::Receive(), recv");
        }

#if defined DEBUG_CLIENT_SERVER
        if (G4VisManager::GetVerbosity() >= G4VisManager::errors)
          G4cout << ">>>>> receivedMessage = " << fReceivedMessage << G4endl;
#endif

}


        //----- G4FRClientServer::ReceiveLine()
void    G4FRClientServer::ReceiveLine()
{
                //----- local
        char    buf[1];
        int index = 0 ;

                //----- receive a line (until newline)
        memset(fReceivedMessage, '\0', RECV_BUFMAX) ;   
        while( read( fSocketFd, buf, 1 ) == 1 ) {
                fReceivedMessage[index++] = buf[0];
                if( IsEndOfLine(buf[0]) ) { break ;}
        }
} // G4FRClientServer::ReceiveLine()


        //----- G4FRClientServer::Send()
void    G4FRClientServer::Send()
{
        if( send( fSocketFd, fSendingMessage, strlen(fSendingMessage) , 0 ) < 0 ) 
        {
                Err("G4FRClientServer::Send(), send");
        }

#if defined DEBUG_CLIENT_SERVER
        if (G4VisManager::GetVerbosity() >= G4VisManager::errors)
          G4cout << "<<<<< SentMessage = " << fSendingMessage << G4endl;
#endif

} // G4FRClientServer::Send()


        //----- G4FRClientServer::Send( message )
void    G4FRClientServer::Send( const char* message ) 
{
        this->SetSendingMessage( message )      ;
        this->Send();

} // G4FRClientServer::Send( message )


        //----- G4FRClientServer::SendLine()
void    G4FRClientServer::SendLine( const char* message ) 
{
                //----- local
        int     smsg_length ;

                //----- set message to sending buf
        this->SetSendingMessage( message )      ;
        smsg_length = GetSendingMessageLength() ;

                //----- add newline if necessary
        if( !IsEndOfLine( fSendingMessage[ (smsg_length - 1)] ) ) {
                fSendingMessage[ smsg_length ]      = GetEndOfLine() ;
                fSendingMessage[ (smsg_length +1) ] = '\0' ;
                smsg_length = GetSendingMessageLength();
        }

                //----- send
        this->Send();

}// G4FRClientServer::SendLine()


        //----- G4FRClientServer::DisConnect()
void G4FRClientServer::DisConnect()
{
                //----- close connection
        if( shutdown(fSocketFd,2) < 0 ) { 
                Err("G4FRClientServer::DisConnect,shutdown");
        }
        close( fSocketFd );

        this->Clear();
}



        //----- G4FRClientServer::Clear()
void G4FRClientServer::Clear()
{
        unlink(SUN_PATH) ;
        fSocketFd = -1   ;
}


        //----- G4FRClientServer::ConnectINET()
int G4FRClientServer::ConnectINET()
{
                //----- local
        int                     flag_connected = 0 ;
        sockaddr_in             server_address ;
        char                    server_hostname[32] ;
        hostent*                server_host_p ;

                //----- make socket
        fSocketFd = socket( AF_INET, SOCK_STREAM, 0 );
        if( fSocketFd < 0 ) { 
#if defined DEBUG_CLIENT_SERVER
          Err("G4FRClientServer::ConnectINET(),socket"); 
#endif
        }

                //----- get IP address of server from its name
        if( getenv( FR_ENV_SERVER_HOST_NAME ) != NULL ) 
        {
                        //----- get server name
                strcpy( server_hostname, getenv( FR_ENV_SERVER_HOST_NAME ) );

                        //----- get IP address of server from its name,
                        //..... reading /etc/hosts
                server_host_p = gethostbyname( server_hostname ) ;
                        
                        //----- If the host specified by FR_ENV_SERVER_HOST_NAME
                        //.....  is not written in /etc/hosts, 
                        //...... server host is set to the same as the
                        //...... client host
                if( !server_host_p ) {
#if defined DEBUG_CLIENT_SERVER
                        Err("G4FRClientServer::ConnectINET(), gethostbyname");
#endif
                        server_host_p = gethostbyname( FR_DEFAULT_HOST_NAME ) ;
                }

        } else {
                        server_host_p = gethostbyname( FR_DEFAULT_HOST_NAME ) ;
        }



// #if defined DEBUG_CLIENT_SERVER
        if (G4VisManager::GetVerbosity() >= G4VisManager::errors)
          G4cout << "***** Trying connection to  " << server_hostname << G4endl;
// #endif 
        

                //----- connection and binding 
        memset( (char *)&server_address, '\0', sizeof(server_address)) ; 
                                // clear server_address
        server_address.sin_family = AF_INET ;
        server_address.sin_port   = htons( PORT_NUMBER );
        memcpy( (char *)(&server_address.sin_addr ), 
                (char *)( server_host_p->h_addr   ), 
                server_host_p->h_length             ); 

        int     connection_status = -1  ;
        int     num_trial         = 0 ;
        while( connection_status < 0 && num_trial <= MAX_CONNECT_TRIAL ) {
                num_trial++ ; 
                connection_status = connect( fSocketFd, (struct sockaddr * )(&server_address), sizeof( server_address ) ) ;
                if( connection_status  <0 ) 
                {
#if defined DEBUG_CLIENT_SERVER
                        Err("G4FRClientServer::ConnectINET(),connect => RETRY");
#endif 
                        flag_connected  = 0 ;
                } else {
                        flag_connected  = 1 ;
                        break ;
                }

                sleep(1);

        } // while(connection_status...)

                //----- return status of connection
        return flag_connected ;

} // G4FRClientServer::ConnectINET()


        //----- G4FRClientServer::WaitSendBack()
void    G4FRClientServer::WaitSendBack( const char* command_string ) 
{
                //----- wait for sending back
        while(1) { 
                this->ReceiveLine();

                if( !strncmp(   this->GetReceivedMessage(), \
                                command_string                , \
                                (strlen(command_string))       )   )
                {
                        break;
                } else {
                        sleep(2);
                }

        } // while

                //----- clear buffer to receive message
        this->ClearReceivedMessage();   

} // G4FRClientServer::WaitSendBack()

#endif // G4VIS_BUILD_DAWN_DRIVER