--- /dev/null
+#include "ping.h"
+
+
+XBT_LOG_NEW_DEFAULT_CATEGORY(Ping,"Messages specific to this example");
+
+/* Global private data */
+typedef struct {
+ gras_socket_t sock;
+ int endcondition;
+} server_data_t;
+
+
+/* register messages which may be sent (common to client and server) */
+void ping_register_messages(void) {
+ gras_msgtype_declare("ping", gras_datadesc_by_name("int"));
+ gras_msgtype_declare("pong", gras_datadesc_by_name("int"));
+ INFO0("Messages registered");
+}
+
+static int server_cb_ping_handler(gras_msg_cb_ctx_t ctx, void* payload) {
+
+ xbt_ex_t e;
+ /* 1. Get the payload into the msg variable, and retrieve my caller */
+ int msg=*(int*)payload;
+ gras_socket_t expeditor = gras_msg_cb_ctx_from(ctx);
+
+ /* 2. Retrieve the server's state (globals) */
+
+ server_data_t *globals=(server_data_t*)gras_userdata_get();
+ globals->endcondition = 0;
+
+ /* 3. Log which client connected */
+ INFO3(">>>>>>>> Got message PING(%d) from %s:%d <<<<<<<<",
+ msg,
+ gras_socket_peer_name(expeditor), gras_socket_peer_port(expeditor));
+
+ /* 4. Change the value of the msg variable */
+ msg = 4321;
+ /* 5. Send it back as payload of a pong message to the expeditor */
+ TRY {
+ gras_msg_send(expeditor, "pong", &msg);
+
+ /* 6. Deal with errors: add some details to the exception */
+ } CATCH(e) {
+ gras_socket_close(globals->sock);
+ RETHROW0("Unable answer with PONG: %s");
+ }
+
+ INFO0(">>>>>>>> Answered with PONG(4321) <<<<<<<<");
+
+ /* 7. Set the endcondition boolean to true (and make sure the server stops after receiving it). */
+ globals->endcondition = 1;
+
+ /* 8. Make sure we don't leak sockets */
+ gras_socket_close(expeditor);
+
+ /* 9. Tell GRAS that we consummed this message */
+ return 0;
+} /* end_of_server_cb_ping_handler */
+
+int server (int argc,char *argv[]) {
+ server_data_t *globals;
+
+ int port = 4000;
+
+ /* 1. Init the GRAS infrastructure and declare my globals */
+ gras_init(&argc,argv);
+ globals=gras_userdata_new(server_data_t);
+
+ /* 2. Get the port I should listen on from the command line, if specified */
+ if (argc == 2) {
+ port=atoi(argv[1]);
+ }
+
+ INFO1("Launch server (port=%d)", port);
+
+ /* 3. Create my master socket */
+ globals->sock = gras_socket_server(port);
+
+ /* 4. Register the known messages. This function is called twice here, but it's because
+ this file also acts as regression test, no need to do so yourself of course. */
+ ping_register_messages();
+ ping_register_messages(); /* just to make sure it works ;) */
+
+ /* 5. Register my callback */
+ gras_cb_register("ping",&server_cb_ping_handler);
+
+ INFO1(">>>>>>>> Listening on port %d <<<<<<<<", gras_socket_my_port(globals->sock));
+ globals->endcondition=0;
+
+ /* 6. Wait up to 10 minutes for an incomming message to handle */
+ gras_msg_handle(60.0);
+
+ /* 7. Housekeeping */
+ if (!globals->endcondition)
+ WARN0("An error occured, the endcondition was not set by the callback");
+
+ /* 8. Free the allocated resources, and shut GRAS down */
+ gras_socket_close(globals->sock);
+ free(globals);
+ gras_exit();
+
+ INFO0("Done.");
+ return 0;
+} /* end_of_server */
+
+
+int client(int argc,char *argv[]) {
+ xbt_ex_t e;
+ gras_socket_t toserver=NULL; /* peer */
+
+ gras_socket_t from;
+ int ping, pong;
+
+ const char *host = "127.0.0.1";
+ int port = 4000;
+
+ /* 1. Init the GRAS's infrastructure */
+ gras_init(&argc, argv);
+
+ /* 2. Get the server's address. The command line override defaults when specified */
+ if (argc == 3) {
+ host=argv[1];
+ port=atoi(argv[2]);
+ }
+
+ INFO2("Launch client (server on %s:%d)",host,port);
+
+ /* 3. Wait for the server startup */
+ gras_os_sleep(1);
+
+ /* 4. Create a socket to speak to the server */
+ TRY {
+ toserver=gras_socket_client(host,port);
+ } CATCH(e) {
+ RETHROW0("Unable to connect to the server: %s");
+ }
+ INFO2("Connected to %s:%d.",host,port);
+
+
+ /* 5. Register the messages.
+ See, it doesn't have to be done completely at the beginning, only before use */
+ ping_register_messages();
+
+ /* 6. Keep the user informed of what's going on */
+ INFO2(">>>>>>>> Connected to server which is on %s:%d <<<<<<<<",
+ gras_socket_peer_name(toserver),gras_socket_peer_port(toserver));
+
+ /* 7. Prepare and send the ping message to the server */
+ ping = 1234;
+ TRY {
+ gras_msg_send(toserver, "ping", &ping);
+ } CATCH(e) {
+ gras_socket_close(toserver);
+ RETHROW0("Failed to send PING to server: %s");
+ }
+ INFO3(">>>>>>>> Message PING(%d) sent to %s:%d <<<<<<<<",
+ ping,
+ gras_socket_peer_name(toserver),gras_socket_peer_port(toserver));
+
+ /* 8. Wait for the answer from the server, and deal with issues */
+ TRY {
+ gras_msg_wait(6000,"pong", &from,&pong);
+ } CATCH(e) {
+ gras_socket_close(toserver);
+ RETHROW0("Why can't I get my PONG message like everyone else: %s");
+ }
+
+ /* 9. Keep the user informed of what's going on, again */
+ INFO3(">>>>>>>> Got PONG(%d) from %s:%d <<<<<<<<",
+ pong,
+ gras_socket_peer_name(from),gras_socket_peer_port(from));
+
+ /* 10. Free the allocated resources, and shut GRAS down */
+ gras_socket_close(toserver);
+ gras_exit();
+ INFO0("Done.");
+ return 0;
+} /* end_of_client */
