3 /* ping - ping/pong demo of GRAS features */
5 /* Copyright (c) 2003, 2004, 2005 Martin Quinson. All rights reserved. */
7 /* This program is free software; you can redistribute it and/or modify it
8 * under the terms of the license (GNU LGPL) which comes with this package. */
12 XBT_LOG_NEW_DEFAULT_CATEGORY(Ping,"Messages specific to this example");
14 /* register messages which may be sent (common to client and server) */
15 static void register_messages(void) {
16 gras_msgtype_declare("ping", gras_datadesc_by_name("int"));
17 gras_msgtype_declare("pong", gras_datadesc_by_name("int"));
20 /* Function prototypes */
21 int server (int argc,char *argv[]);
22 int client (int argc,char *argv[]);
24 /* **********************************************************************
26 * **********************************************************************/
28 /* Global private data */
35 static int server_cb_ping_handler(gras_socket_t expeditor,
39 /* 1. Get the payload into the msg variable */
40 int msg=*(int*)payload_data;
42 /* 2. Retrieve the server's state (globals) */
44 server_data_t *globals=(server_data_t*)gras_userdata_get();
45 globals->endcondition = 0;
47 /* 3. Log which client connected */
48 INFO3(">>>>>>>> Got message PING(%d) from %s:%d <<<<<<<<",
50 gras_socket_peer_name(expeditor), gras_socket_peer_port(expeditor));
52 /* 4. Change the value of the msg variable */
54 /* 5. Send it back as payload of a pong message to the expeditor */
56 gras_msg_send(expeditor, gras_msgtype_by_name("pong"), &msg);
58 /* 6. Deal with errors: add some details to the exception */
60 gras_socket_close(globals->sock);
61 RETHROW0("Unable answer with PONG: %s");
64 INFO0(">>>>>>>> Answered with PONG(4321) <<<<<<<<");
66 /* 7. Set the endcondition boolean to true (and make sure the server stops after receiving it). */
67 globals->endcondition = 1;
69 /* 8. Make sure we don't leak sockets */
70 gras_socket_close(expeditor);
72 /* 9. Tell GRAS that we consummed this message */
74 } /* end_of_server_cb_ping_handler */
76 int server (int argc,char *argv[]) {
77 server_data_t *globals;
81 /* 1. Init the GRAS infrastructure and declare my globals */
82 gras_init(&argc,argv);
83 globals=gras_userdata_new(server_data_t);
85 /* 2. Get the port I should listen on from the command line, if specified */
90 INFO1("Launch server (port=%d)", port);
92 /* 3. Create my master socket */
93 globals->sock = gras_socket_server(port);
95 /* 4. Register the known messages. This function is called twice here, but it's because
96 this file also acts as regression test, no need to do so yourself of course. */
98 register_messages(); /* just to make sure it works ;) */
100 /* 5. Register my callback */
101 gras_cb_register(gras_msgtype_by_name("ping"),&server_cb_ping_handler);
103 INFO1(">>>>>>>> Listening on port %d <<<<<<<<", gras_socket_my_port(globals->sock));
104 globals->endcondition=0;
106 /* 6. Wait up to 10 minutes for an incomming message to handle */
107 gras_msg_handle(600.0);
109 /* 7. Housekeeping */
110 if (!globals->endcondition)
111 WARN0("An error occured, the endcondition was not set by the callback");
113 /* 8. Free the allocated resources, and shut GRAS down */
114 gras_socket_close(globals->sock);
120 } /* end_of_server */
122 /* **********************************************************************
124 * **********************************************************************/
126 /* Function prototypes */
128 int client(int argc,char *argv[]) {
130 gras_socket_t toserver; /* peer */
135 const char *host = "127.0.0.1";
138 /* 1. Init the GRAS's infrastructure */
139 gras_init(&argc, argv);
141 /* 2. Get the server's address. The command line override defaults when specified */
147 INFO2("Launch client (server on %s:%d)",host,port);
149 /* 3. Wait for the server startup */
152 /* 4. Create a socket to speak to the server */
154 toserver=gras_socket_client(host,port);
156 RETHROW0("Unable to connect to the server: %s");
158 INFO2("Connected to %s:%d.",host,port);
161 /* 5. Register the messages.
162 See, it doesn't have to be done completely at the beginning, only before use */
165 /* 6. Keep the user informed of what's going on */
166 INFO2(">>>>>>>> Connected to server which is on %s:%d <<<<<<<<",
167 gras_socket_peer_name(toserver),gras_socket_peer_port(toserver));
169 /* 7. Prepare and send the ping message to the server */
172 gras_msg_send(toserver, gras_msgtype_by_name("ping"), &ping);
174 gras_socket_close(toserver);
175 RETHROW0("Failed to send PING to server: %s");
177 INFO3(">>>>>>>> Message PING(%d) sent to %s:%d <<<<<<<<",
179 gras_socket_peer_name(toserver),gras_socket_peer_port(toserver));
181 /* 8. Wait for the answer from the server, and deal with issues */
183 gras_msg_wait(6000,gras_msgtype_by_name("pong"),
186 gras_socket_close(toserver);
187 RETHROW0("Why can't I get my PONG message like everyone else: %s");
190 /* 9. Keep the user informed of what's going on, again */
191 INFO3(">>>>>>>> Got PONG(%d) from %s:%d <<<<<<<<",
193 gras_socket_peer_name(from),gras_socket_peer_port(from));
195 /* 10. Free the allocated resources, and shut GRAS down */
196 gras_socket_close(toserver);
200 } /* end_of_client */