Example10_NetChat.cpp

/*--------------------------------------------
   Examples - CRM32Pro SDK - Roberto Prieto
   Copyright (C) 2001-2011 MegaStorm Systems
  --------------------------------------------

  Example 10: using INetwork on Non-Authoritative mode
  ----------------------------------------------------
  - Initialize CRM32Pro and SDL.
  - Printing help on console.
  - Use of log system.
  - Initializing network system.
  - Using Non-Authoritative Server Mode.
  - Each instance run as server or as client.
  - Simple chat.
  - Exiting using the right way ;)

  This example is totally free and can be used without 
any restriction but there is not any warranty for its usage.
Please, do not forget to include a copy of all the library licenses
located at /licenses directory if you distribute or share it.

Roberto Prieto
contact@megastormsystems.com
http://www.megastormsystems.com
*/

// ---Includes---
#include "CRM32Pro.h" 

// ---Defines---
#define EXAMPLE_VERSION "Example 10: INetwork on Non-Authoritative mode"

// ---Prototypes---
void ExecuteClient(char *server,char *myname);
void ExecuteServer();
int ReadLine(void *);
void PrintHelp(char *sErrMsg = NULL);

// ---Global vars---
int done; // Used by "ReadLine()" thread to finalize

// -------------MAIN FUNCTION----------------
int main(int argc,char **argv)
{          
    Uint8       bMode = 0;

    // -Print help without any arguments-
    if(argc < 2) 
    {
        PrintHelp();
        return 1;
    }

    // -Get arguments from command line-
    if(!strcmp(argv[1],"-s")) 
    {
        // Run as server
        bMode = 1;  
        // Log system initialize
        ILogSystem.Init("NetChatServer.log",LOG_CONSOLE | LOG_FILE,LOG_NORMAL,EXAMPLE_VERSION);
    }
    else if(!strcmp(argv[1],"-c"))
    {
        if(argc > 2) 
        {
            // Run as client
            bMode = 2; 
            // Log system initialize
            ILogSystem.Init("NetChatClient.log",LOG_CONSOLE | LOG_FILE,LOG_NORMAL,EXAMPLE_VERSION);
        }
    }

    // -Are the arguments OK?-
    if(bMode == 0) 
    {
        PrintHelp("\n Error: invalid arguments\n");
        return 1;
    }

    // -CRM32Pro and SDL initialize- 
    if(CRM32Pro.Init(0) < 0)
    {
        ILogSystem.Msg(LOG_NORMAL," · [LOG] - Could not initialize CRM32Pro: %s\n",SDL_GetError());
        return 1;
    }

    // -Interfaz network initialize-        
    if(!INetwork->Init(LOG_CONSOLE | LOG_FILE))
    {
        ILogSystem.Msg(LOG_NORMAL," · [LOG] - Could not initialize INetworkSystem\n");
        CRM32Pro.Quit();
        return 1;
    }

    // -Execute a server or a client-
    if(bMode == 1) ExecuteServer();
    else 
    {
        // Look for a client name
        if(argc > 3) ExecuteClient(argv[2],argv[3]);
        // Or use a default one
        else ExecuteClient(argv[2],"Anonymous");
    }

    // -Exiting..-   
    INetwork->Quit();
    CRM32Pro.Quit();
    return 0;
}

// -------------------CLIENT STUFF-----------------------
// -Execution of a client-
void ExecuteClient(char *server,char *myname)
{
    char       *buff = NULL; 
    Uint32 size = 0, result = 0;
    SDL_Thread *ReadLineT = NULL;

    // -Trying to connect to server on port 2200 with password 1001-
    if(!INetwork->ConnectTo(server,2200,myname,1001)) return;

    // -Using a thread, we can send/receive data at the same "time"-
    // We have a little chat ;)
    ReadLineT = SDL_CreateThread(ReadLine,NULL);                  

    // -Main Loop-
    done = 0;

    while(!done)
    {      
        // Have we received data?
        result = INetwork->ReceiveData(&buff,&size);              
        switch(result)
        {
        case INETWORK_ERROR:
            puts("Error detected!");
        case INETWORK_CLOSE:
            puts("Closing application. Press ENTER to finish");
            // With done = 1, the reading thread should finish by itself
            done = 1; 
            // Waiting for the end of our reading thread                                
            SDL_WaitThread(ReadLineT,NULL);
            ReadLineT = NULL;
            break;
        case INETWORK_NEWCLIENT:
            ILogSystem.Msg(LOG_NORMAL,"[New client '%s' connected]\n",buff);
            break;
        case INETWORK_QUITCLIENT:
            ILogSystem.Msg(LOG_NORMAL,"['%s' client has quitted]\n",buff);
            break;
        case INETWORK_PING:
            break;
        case INETWORK_CLIENTSINFO:
            ILogSystem.Msg(LOG_NORMAL,"[Clients information updated]\n");
            break;
        case INETWORK_DATA:
            ILogSystem.Msg(LOG_NORMAL,":%s(%dbytes)\n",buff,size); 
            break;
        }
        // Delete received data (if any)
        INetwork->FreeData(buff);
        // Your code...we only wait 250ms
        SDL_Delay(250);
    }
    // It's not necessary to kill our thread because it finishes by itself with done=1
}

// -Our thread to read a line and send it-
#define MAXLEN (1*1024) // 1 KB - adequate for text!
int ReadLine(void *data)
{          
    char     message[MAXLEN];
    Uint32   len = 0, nc,i;
    char    *str;
    sClientInfo *cInfo;
    strcpy(message,"");

    // ---Main loop---
    while(!done)
    {
        strcpy(message,"");      
        // As we are not using a non blocking read method, quite probably we will have to press ENTER
        // to finish this thread, but the user will be informed on that case 
        fgets(message,1024,stdin);
        len = (int)strlen(message);      
        SDL_Delay(250);
        if((len) && (!done))
        {
            message[len - 1] = '\0';

            // -With '1', query to close this client-
            if(message[0] == '1') INetwork->QueryKillClient();

            // -With '2', query to close the server (and all clients)
            else if(message[0] == '2') INetwork->QueryKillServer();

            // -With '3', query a list of current clients with updated information
            else if(message[0] == '3') INetwork->QueryClientsInfo();

            // -With '4', send raw data to server-
#define HOW_KB 32*1024
            else if(message[0] == '4')
            {
                len = HOW_KB;
                str = new char[len];        
                memset(str,0,len);
                ILogSystem.Msg(LOG_NORMAL,"[Sending a block of %dKb raw data]\n",len / 1024);                                                                                              
                INetwork->SendData(str,len);
                delete str;                                                  
            }

            // -With '5', show our local clients information table-
            else if(message[0] == '5')
            {
                nc = INetwork->GetClientsInfo(&cInfo);
                ILogSystem.Msg(LOG_NORMAL," Number of clients: %d\n",nc);
                for(i = 0; i < nc; i++)
                {
                    ILogSystem.Msg(LOG_NORMAL,"Client '%s' - IP '%d.%d.%d.%d' - Current %dms - Average %dms.\n",
                        cInfo[i].szName,cInfo[i].IP >> 24,(cInfo[i].IP >> 16) & 0xff, (cInfo[i].IP >> 8) & 0xff,
                        cInfo[i].IP & 0xff, cInfo[i].iLatency, cInfo[i].iLatencyAvg);
                }

            }

            // -With '6', show current statistic-
            else if(message[0] == '6')
            {
                INetwork->Info();
            }

            // -Send a text line-
            else
            {                                          
                ILogSystem.Msg(LOG_NORMAL,"[Sending a text line of %d bytes]\n",len);                                                                                           
                INetwork->SendData(message,len);
            }
        }  
    }
    return 1;
}


// -------------------Server STUFF-----------------------
// -Execution of a server-
void ExecuteServer()
{
    // Create a dedicatedserver listening on port 2200 and with 1001 as password
    if(!INetwork->CreateServer(2200,1001,1)) return;
}

// --------------------Help STUFF------------------------
// -Print help-
void PrintHelp(char *sErrMsg)
{
    printf("-----------------------------------------------------------\n");
    printf("                 CRM32Pro SDK - HelpScreen\n    %s\n",EXAMPLE_VERSION);
    printf("-----------------------------------------------------------\n\n");
    printf(" Use:\n");
    printf("   -  'NetChat -s' to run as server\n");
    printf("   -  'NetChat -c ServerIP [my_name]' to connect to a server\n\n");
    printf(" Once you are connected to a server, you can press [ENTER]\n");
    printf(" key to send any text to others clients.\n");
    printf(" There are a few words that are reserved internally:\n");
    printf("  > '1' the client wants to exit\n");
    printf("  > '2' the client wants to close the server\n");
    printf("  > '3' the client has asked for info about clients(including itself)\n");
    printf("  > '4' the client sends a raw block data of %dKB\n",HOW_KB/1024);
    printf("  > '5' the client dumps the local clients information\n");
    printf("  > '6' the client shows the current statistics\n");
    if(sErrMsg != NULL) printf("%s",sErrMsg);
    else printf("\n");
    puts("Press [ENTER] key to continue");
    getchar();
}