examples/ping/ping.c

   1 /* $Id$ */
   2
   3 /* ping - ping/pong demo of GRAS features                                   */
   4
   5 /* Authors: Martin Quinson                                                  */
   6 /* Copyright (C) 2003 the OURAGAN project.                                  */
   7
   8 /* This program is free software; you can redistribute it and/or modify it
   9    under the terms of the license (GNU LGPL) which comes with this package. */
  10
  11 #include <stdio.h>
  12 #include <stdlib.h>
  13 #include <signal.h>
  14
  15 #include <gras.h>
  16
  17 GRAS_LOG_NEW_DEFAULT_CATEGORY(Ping);
  18
  19 /* **********************************************************************
  20  * Comon code
  21  * **********************************************************************/
  22
  23 typedef struct {
  24   int dummy;
  25 } msg_ping_t;
  26
  27 /* Function prototypes */
  28 gras_error_t register_messages(void);
  29
  30 /* Code */
  31 gras_error_t register_messages(void) {
  32   gras_error_t errcode;
  33   gras_msgtype_t *msg_t; /* FIXME: not needed */
  34
  35   TRY(gras_msgtype_declare("ping", gras_datadesc_by_name("int"), &msg_t));
  36   TRY(gras_msgtype_declare("pong", gras_datadesc_by_name("int"), &msg_t));
  37
  38   return no_error;
  39 }
  40
  41 /* **********************************************************************
  42  * Server code
  43  * **********************************************************************/
  44
  45 /* Global private data */
  46 typedef struct {
  47   gras_socket_t *sock;
  48   int endcondition;
  49 } server_data_t;
  50
  51 /* Function prototypes */
  52 int server_cb_ping_handler(gras_socket_t        *expeditor,
  53                            void                 *payload_data);
  54 int server (int argc,char *argv[]);
  55
  56
  57 int server_cb_ping_handler(gras_socket_t        *expeditor,
  58                            void                 *payload_data) {
  59
  60   gras_error_t errcode;
  61   int msg=*(int*)payload_data;
  62   gras_msgtype_t *pong_t=NULL;
  63
  64   server_data_t *g=(server_data_t*)gras_userdata_get();
  65
  66   g->endcondition = 0;
  67   INFO3("SERVER: >>>>>>>> Got message PING(%d) from %s:%d <<<<<<<<",
  68         msg,
  69         gras_socket_peer_name(expeditor),
  70         gras_socket_peer_port(expeditor));
  71
  72   msg = 4321;
  73   TRY(gras_msgtype_by_name("pong",&pong_t));
  74   errcode = gras_msg_send(expeditor, pong_t, &msg);
  75
  76   if (errcode != no_error) {
  77     ERROR1("SERVER: Unable answer with PONG: %s\n", gras_error_name(errcode));
  78     gras_socket_close(g->sock);
  79     return 1;
  80   }
  81
  82   INFO0("SERVER: >>>>>>>> Answed with PONG(4321) <<<<<<<<");
  83   g->endcondition = 1;
  84   gras_socket_close(expeditor);
  85   return 1;
  86 }
  87
  88 int server (int argc,char *argv[]) {
  89   gras_error_t errcode;
  90   server_data_t *g=gras_userdata_new(server_data_t);
  91   gras_msgtype_t *ping_msg=NULL;
  92
  93   int port = 4000;
  94
  95   if (argc == 2) {
  96     port=atoi(argv[1]);
  97   }
  98
  99   INFO1("Launch server (port=%d)", port);
 100
 101   if ((errcode=gras_socket_server(port,&(g->sock)))) {
 102     CRITICAL1("Error %s encountered while opening the server socket",
 103               gras_error_name(errcode));
 104     return 1;
 105   }
 106
 107   TRYFAIL(register_messages());
 108   TRYFAIL(register_messages());
 109   TRYFAIL(gras_msgtype_by_name("ping",&ping_msg));
 110   TRYFAIL(gras_cb_register(ping_msg,&server_cb_ping_handler));
 111
 112   INFO1("SERVER: >>>>>>>> Listening on port %d <<<<<<<<",
 113         gras_socket_my_port(g->sock));
 114   g->endcondition=0;
 115
 116   while (1) {
 117     errcode = gras_msg_handle(10.0);
 118     if (errcode != no_error && errcode != timeout_error)
 119       return errcode;
 120     if (g->endcondition)
 121       break;
 122   }
 123
 124   if (!gras_if_RL())
 125     gras_sleep(5,0);
 126   INFO0("SERVER: Done.");
 127   gras_socket_close(g->sock);
 128   free(g);
 129   return no_error;
 130 }
 131
 132 /* **********************************************************************
 133  * Client code
 134  * **********************************************************************/
 135
 136 /* Global private data */
 137 typedef struct {
 138   gras_socket_t *sock;
 139 } client_data_t;
 140
 141 /* Function prototypes */
 142 int client (int argc,char *argv[]);
 143
 144 int client(int argc,char *argv[]) {
 145   gras_error_t errcode;
 146   client_data_t *g=gras_userdata_new(client_data_t);
 147
 148   gras_socket_t  *from;
 149   int ping, pong;
 150   gras_msgtype_t *msg_ping_type, *msg_pong_type;
 151
 152   const char *host = "127.0.0.1";
 153         int   port = 4000;
 154
 155   msg_ping_type = msg_pong_type = NULL;
 156
 157   if (argc == 3) {
 158     host=argv[1];
 159     port=atoi(argv[2]);
 160   }
 161
 162   fprintf(stderr,"Launch client (server on %s:%d)",host,port);
 163   if (!gras_if_RL())
 164     gras_sleep(5,0); /* Wait for the server to be setup */
 165   if ((errcode=gras_socket_client(host,port,&(g->sock)))) {
 166     ERROR1("Client: Unable to connect to the server. Got %s",
 167            gras_error_name(errcode));
 168     return 1;
 169   }
 170   INFO2("Client: Connected to %s:%d.",host,port);
 171
 172
 173   TRY(register_messages());
 174   TRY(gras_msgtype_by_name("ping",&msg_ping_type));
 175   TRY(gras_msgtype_by_name("pong",&msg_pong_type));
 176
 177   INFO2("Client: >>>>>>>> Connected to server which is on %s:%d <<<<<<<<",
 178         gras_socket_peer_name(g->sock),gras_socket_peer_port(g->sock));
 179
 180   ping = 1234;
 181   errcode = gras_msg_send(g->sock, msg_ping_type, &ping);
 182   if (errcode != no_error) {
 183     fprintf(stderr, "Client: Unable send PING to server (%s)\n",
 184             gras_error_name(errcode));
 185     gras_socket_close(g->sock);
 186     return 1;
 187   }
 188   INFO3("Client: >>>>>>>> Message PING(%d) sent to %s:%d <<<<<<<<",
 189         ping,
 190         gras_socket_peer_name(g->sock),gras_socket_peer_port(g->sock));
 191
 192   if ((errcode=gras_msg_wait(6000,
 193                              msg_pong_type,&from,&pong))) {
 194     ERROR1("Client: Why can't I get my PONG message like everyone else (%s)?",
 195            gras_error_name(errcode));
 196     gras_socket_close(g->sock);
 197     return 1;
 198   }
 199
 200   INFO3("Client: >>>>>>>> Got PONG(%d) got from %s:%d <<<<<<<<",
 201         pong,
 202         gras_socket_peer_name(from),gras_socket_peer_port(from));
 203
 204   gras_socket_close(g->sock);
 205   free(g);
 206   INFO0("Client: Done.");
 207   return 0;
 208 }