3 /* rpc - demo of the RPC features in GRAS */
5 /* Copyright (c) 2006 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(Rpc,"Messages specific to this example");
14 int err=0; /* to make the message of the raised exception more informative and
15 even be able to follow their propagation from server to client*/
17 /* register messages which may be sent (common to client and server) */
18 static void register_messages(void) {
19 gras_msgtype_declare_rpc("plain ping",
20 gras_datadesc_by_name("int"),
21 gras_datadesc_by_name("int"));
23 gras_msgtype_declare_rpc("raise exception", NULL, NULL);
24 gras_msgtype_declare_rpc("forward exception", NULL, NULL);
25 gras_msgtype_declare("kill",NULL);
28 /* Function prototypes */
29 int server (int argc,char *argv[]);
30 int forwarder (int argc,char *argv[]);
31 int client (int argc,char *argv[]);
33 static void exception_raising(void) {
34 THROW1(unknown_error,42,"Some error we will catch on client side %d",err++);
36 static void exception_catching(void) {
48 THROW0(unknown_error,0,"Didn't got the remote exception!");
50 xbt_assert2(e.category == unknown_error, "Got wrong category: %d (instead of %d)",
51 e.category,unknown_error);
52 xbt_assert1(e.value == 42, "Got wrong value: %d (!=42)", e.value);
53 xbt_assert1(!strncmp(e.msg,"Some error we will catch on client side",
54 strlen("Some error we will catch on client side")),
55 "Got wrong message: %s", e.msg);
60 /* **********************************************************************
62 * **********************************************************************/
65 int client(int argc,char *argv[]) {
67 gras_socket_t toserver=NULL; /* peer */
68 gras_socket_t toforwarder=NULL; /* peer */
70 memset(&e,0,sizeof(xbt_ex_t));
75 const char *host = "127.0.0.1";
78 /* 1. Init the GRAS's infrastructure */
79 gras_init(&argc, argv);
81 /* 2. Get the server's address. The command line override defaults when specified */
86 INFO2("Launch client (server on %s:%d)",host,port);
90 /* 3. Wait for the server & forwarder startup */
93 /* 4. Create a socket to speak to the server */
96 toserver=gras_socket_client(host,port);
97 toforwarder=gras_socket_client(argv[3],atoi(argv[4]));
99 RETHROW0("Unable to connect to the server: %s");
101 INFO2("Connected to %s:%d.",host,port);
104 /* 5. Register the messages.
105 See, it doesn't have to be done completely at the beginning,
106 but only before use */
107 exception_catching();
110 /* 6. Keep the user informed of what's going on */
111 INFO2("Connected to server which is on %s:%d ",
112 gras_socket_peer_name(toserver),gras_socket_peer_port(toserver));
114 /* 7. Prepare and send the ping message to the server */
117 exception_catching();
118 gras_msg_rpccall(toserver, 6000.0,
119 gras_msgtype_by_name("plain ping"), &ping, &pong);
121 gras_socket_close(toserver);
122 RETHROW0("Failed to execute a PING rpc on the server: %s");
124 exception_catching();
126 /* 8. Keep the user informed of what's going on, again */
127 INFO4("The answer to PING(%d) on %s:%d is PONG(%d) ",
129 gras_socket_peer_name(toserver),gras_socket_peer_port(toserver),
132 /* 9. Call a RPC which raises an exception (to test exception propagation) */
133 INFO0("Call the exception raising RPC");
135 gras_msg_rpccall(toserver, 6000.0,
136 gras_msgtype_by_name("raise exception"), NULL, NULL);
139 xbt_assert2(e.category == unknown_error,
140 "Got wrong category: %d (instead of %d)",
141 e.category,unknown_error);
142 xbt_assert1(e.value == 42, "Got wrong value: %d (!=42)", e.value);
143 xbt_assert1(!strncmp(e.msg,"Some error we will catch on client side",
144 strlen("Some error we will catch on client side")),
145 "Got wrong message: %s", e.msg);
146 INFO0("Got the expected exception when calling the exception raising RPC");
151 THROW0(unknown_error,0,"Didn't got the remote exception!");
153 INFO0("Called the exception raising RPC");
154 exception_catching();
157 for (i=0; i<5; i++) {
159 INFO1("Call the exception raising RPC (i=%d)",i);
161 gras_msg_rpccall(toserver, 6000.0,
162 gras_msgtype_by_name("raise exception"), NULL, NULL);
168 THROW0(unknown_error,0,"Didn't got the remote exception!");
173 /* 9. Call a RPC which raises an exception (to test that exception propagation works) */
175 INFO1("Call the exception raising RPC on the forwarder (i=%d)",i);
177 gras_msg_rpccall(toforwarder, 6000.0,
178 gras_msgtype_by_name("forward exception"), NULL, NULL);
183 THROW0(unknown_error,0,"Didn't got the remote exception!");
185 xbt_assert1(e.value == 42, "Got wrong value: %d (!=42)", e.value);
186 xbt_assert1(!strncmp(e.msg,"Some error we will catch on client side",
187 strlen("Some error we will catch on client side")),
188 "Got wrong message: %s", e.msg);
189 xbt_assert2(e.category == unknown_error,
190 "Got wrong category: %d (instead of %d)",
191 e.category,unknown_error);
192 INFO0("Got the expected exception when calling the exception raising RPC");
194 exception_catching();
197 gras_msg_send(toserver,gras_msgtype_by_name("kill"),NULL);
198 gras_msg_send(toforwarder,gras_msgtype_by_name("kill"),NULL);
200 /* 11. Cleanup the place before leaving */
201 gras_socket_close(toserver);
202 gras_socket_close(toforwarder);
206 } /* end_of_client */
209 /* **********************************************************************
211 * **********************************************************************/
213 gras_socket_t server;
215 } s_forward_data_t, *forward_data_t;
217 static int forwarder_cb_kill(gras_msg_cb_ctx_t ctx,
218 void *payload_data) {
219 forward_data_t fdata=gras_userdata_get();
224 static int forwarder_cb_forward_ex(gras_msg_cb_ctx_t ctx,
225 void *payload_data) {
226 forward_data_t fdata=gras_userdata_get();
228 gras_msg_rpccall(fdata->server, 60,
229 gras_msgtype_by_name("raise exception"),NULL,NULL);
233 int forwarder (int argc,char *argv[]) {
234 gras_socket_t mysock;
236 forward_data_t fdata;
238 gras_init(&argc,argv);
240 xbt_assert(argc == 4);
242 fdata=gras_userdata_new(s_forward_data_t);
246 INFO1("Launch forwarder (port=%d)", port);
247 mysock = gras_socket_server(port);
249 gras_os_sleep(1); /* wait for the server to be ready */
250 fdata->server=gras_socket_client(argv[2],atoi(argv[3]));
253 gras_cb_register(gras_msgtype_by_name("forward exception"),
254 &forwarder_cb_forward_ex);
255 gras_cb_register(gras_msgtype_by_name("kill"),
258 while (!fdata->done) {
259 gras_msg_handle(600.0);
262 gras_socket_close(mysock);
263 gras_socket_close(fdata->server);
270 /* **********************************************************************
272 * **********************************************************************/
274 gras_socket_t server;
276 } s_server_data_t, *server_data_t;
278 static int server_cb_kill(gras_msg_cb_ctx_t ctx,
279 void *payload_data) {
280 server_data_t sdata=gras_userdata_get();
285 static int server_cb_raise_ex(gras_msg_cb_ctx_t ctx,
286 void *payload_data) {
291 static int server_cb_ping(gras_msg_cb_ctx_t ctx,
292 void *payload_data) {
294 /* 1. Get the payload into the msg variable, and retrieve who called us */
295 int msg=*(int*)payload_data;
296 gras_socket_t expeditor = gras_msg_cb_ctx_from(ctx);
298 /* 2. Log which client connected */
299 INFO3("Got message PING(%d) from %s:%d ",
301 gras_socket_peer_name(expeditor), gras_socket_peer_port(expeditor));
303 /* 4. Change the value of the msg variable */
306 /* 5. Return as result */
307 gras_msg_rpcreturn(6000,ctx,&msg);
308 INFO0("Answered with PONG(4321)");
310 /* 6. Cleanups, if any */
312 /* 7. Tell GRAS that we consummed this message */
314 } /* end_of_server_cb_ping */
317 int server (int argc,char *argv[]) {
318 gras_socket_t mysock;
323 /* 1. Init the GRAS infrastructure */
324 gras_init(&argc,argv);
326 /* 2. Get the port I should listen on from the command line, if specified */
330 sdata=gras_userdata_new(s_server_data_t);
333 INFO1("Launch server (port=%d)", port);
335 /* 3. Create my master socket */
336 mysock = gras_socket_server(port);
338 /* 4. Register the known messages and register my callback */
340 gras_cb_register(gras_msgtype_by_name("plain ping"),&server_cb_ping);
341 gras_cb_register(gras_msgtype_by_name("raise exception"),&server_cb_raise_ex);
342 gras_cb_register(gras_msgtype_by_name("kill"),&server_cb_kill);
344 INFO1("Listening on port %d ", gras_socket_my_port(mysock));
346 /* 5. Wait for the ping incomming messages */
348 /** \bug if the server is gone before the forwarder tries to connect,
349 it dies awfully with the following message. The problem stands somewhere
350 at the interface between the gras_socket_t and the msg mess. There is thus
351 no way for me to dive into this before this interface is rewritten
352 ==15875== Invalid read of size 4
353 ==15875== at 0x408B805: find_port (transport_plugin_sg.c:68)
354 ==15875== by 0x408BD64: gras_trp_sg_socket_client (transport_plugin_sg.c:115)
355 ==15875== by 0x404A38B: gras_socket_client_ext (transport.c:255)
356 ==15875== by 0x404A605: gras_socket_client (transport.c:288)
357 ==15875== by 0x804B49D: forwarder (rpc.c:245)
358 ==15875== by 0x80491FB: launch_forwarder (_rpc_simulator.c:52)
359 ==15875== by 0x406780B: __context_wrapper (context.c:164)
360 ==15875== by 0x41A6CB3: pthread_start_thread (manager.c:310)
361 ==15875== by 0x42AA549: clone (clone.S:119)
362 ==15875== Address 0x433B49C is 44 bytes inside a block of size 48 free'd
363 ==15875== at 0x401CF46: free (vg_replace_malloc.c:235)
364 ==15875== by 0x408F1FA: gras_process_exit (sg_process.c:117)
365 ==15875== by 0x4049386: gras_exit (gras.c:64)
366 ==15875== by 0x804B936: server (rpc.c:345)
367 ==15875== by 0x80492B1: launch_server (_rpc_simulator.c:69)
368 ==15875== by 0x406780B: __context_wrapper (context.c:164)
369 ==15875== by 0x41A6CB3: pthread_start_thread (manager.c:310)
370 ==15875== by 0x42AA549: clone (clone.S:119)
372 while (!sdata->done) {
373 gras_msg_handle(600.0);
374 exception_catching();
377 /* 8. Free the allocated resources, and shut GRAS down */
379 gras_socket_close(mysock);
384 } /* end_of_server */