3 /* gras message exchanges */
5 /* Copyright (c) 2003, 2004, 2005, 2006, 2007 Martin Quinson. */
6 /* All rights reserved. */
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. */
12 #include "xbt/ex_interface.h"
13 #include "gras/Msg/msg_private.h"
14 #include "gras/Virtu/virtu_interface.h"
15 #include "gras/Transport/transport_interface.h" /* gras_select */
17 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(gras_msg);
21 const char *e_gras_msg_kind_names[e_gras_msg_kind_count]=
22 {"UNKNOWN","ONEWAY","RPC call","RPC answer","RPC error"};
25 /** \brief Waits for a message to come in over a given socket.
27 * @param timeout: How long should we wait for this message.
28 * @param msgt_want: type of awaited msg (or NULL if I'm enclined to accept any message)
29 * @param expe_want: awaited expeditot (match on hostname, not port; NULL if not relevant)
30 * @param filter: function returning true or false when passed a payload. Messages for which it returns false are not selected. (NULL if not relevant)
31 * @param filter_ctx: context passed as second argument of the filter (a pattern to match?)
32 * @param[out] msg_got: where to write the message we got
34 * Every message of another type received before the one waited will be queued
35 * and used by subsequent call to this function or gras_msg_handle().
39 gras_msg_wait_ext_(double timeout,
41 gras_msgtype_t msgt_want,
42 gras_socket_t expe_want,
43 gras_msg_filter_t filter,
50 gras_msg_procdata_t pd=
51 (gras_msg_procdata_t)gras_libdata_by_id(gras_msg_libdata_id);
54 xbt_assert0(msg_got,"msg_got is an output parameter");
56 start = gras_os_time();
57 VERB1("Waiting for message '%s'",msgt_want?msgt_want->name:"(any)");
59 xbt_dynar_foreach(pd->msg_waitqueue,cpt,msg){
60 if ( ( !msgt_want || (msg.type->code == msgt_want->code))
61 && (!expe_want || (!strcmp( gras_socket_peer_name(msg.expe),
62 gras_socket_peer_name(expe_want))))
63 && (!filter || filter(&msg,filter_ctx))) {
65 memcpy(msg_got,&msg,sizeof(s_gras_msg_t));
66 xbt_dynar_cursor_rm(pd->msg_waitqueue, &cpt);
67 VERB0("The waited message was queued");
72 xbt_dynar_foreach(pd->msg_queue,cpt,msg){
73 if ( ( !msgt_want || (msg.type->code == msgt_want->code))
74 && (!expe_want || (!strcmp( gras_socket_peer_name(msg.expe),
75 gras_socket_peer_name(expe_want))))
76 && (!filter || filter(&msg,filter_ctx))) {
78 memcpy(msg_got,&msg,sizeof(s_gras_msg_t));
79 xbt_dynar_cursor_rm(pd->msg_queue, &cpt);
80 VERB0("The waited message was queued");
89 restart_receive: /* Goto here when the receive of a message failed */
92 memset(&msg,sizeof(msg),0);
95 xbt_queue_shift_timed(pd->msg_received,&msg,timeout ? timeout - now + start : 0);
97 msg.expe = gras_trp_select(timeout ? timeout - now + start : 0);
98 gras_msg_recv(msg.expe, &msg);
101 if (e.category == system_error &&
102 !strncmp("Socket closed by remote side",e.msg,
103 strlen("Socket closed by remote side"))) {
111 goto restart_receive;
113 DEBUG0("Got a message from the socket");
115 if ( ( !msgt_want || (msg.type->code == msgt_want->code))
116 && (!expe_want || (!strcmp( gras_socket_peer_name(msg.expe),
117 gras_socket_peer_name(expe_want))))
118 && (!filter || filter(&msg,filter_ctx))) {
120 memcpy(msg_got,&msg,sizeof(s_gras_msg_t));
121 DEBUG0("Message matches expectations. Use it.");
124 DEBUG0("Message does not match expectations. Queue it.");
126 /* not expected msg type. Queue it for later */
127 xbt_dynar_push(pd->msg_queue,&msg);
130 if (now - start + 0.001 > timeout) {
131 THROW1(timeout_error, now-start+0.001-timeout,
132 "Timeout while waiting for msg '%s'",
133 msgt_want?msgt_want->name:"(any)");
139 /** \brief Waits for a message to come in over a given socket.
141 * @param timeout: How long should we wait for this message.
142 * @param msgt_want: type of awaited msg
143 * @param[out] expeditor: where to create a socket to answer the incomming message
144 * @param[out] payload: where to write the payload of the incomming message
145 * @return the error code (or no_error).
147 * Every message of another type received before the one waited will be queued
148 * and used by subsequent call to this function or gras_msg_handle().
151 gras_msg_wait_(double timeout,
152 gras_msgtype_t msgt_want,
153 gras_socket_t *expeditor,
157 gras_msg_wait_ext_(timeout,
158 msgt_want, NULL, NULL, NULL,
161 if (msgt_want->ctn_type) {
163 "Message type '%s' convey a payload you must accept",
166 xbt_assert1(!payload,
167 "No payload was declared for message type '%s'",
172 memcpy(payload,msg.payl,msg.payl_size);
177 *expeditor = msg.expe;
180 static int gras_msg_wait_or_filter(gras_msg_t msg, void *ctx) {
181 xbt_dynar_t dyn=(xbt_dynar_t)ctx;
182 int res = xbt_dynar_member(dyn,msg->type);
184 VERB1("Got matching message (type=%s)",msg->type->name);
186 VERB0("Got message not matching our expectations");
189 /** \brief Waits for a message to come in over a given socket.
191 * @param timeout: How long should we wait for this message.
192 * @param msgt_want: a dynar containing all accepted message type
193 * @param[out] ctx: the context of received message (in case it's a RPC call we want to answer to)
194 * @param[out] msgt_got: indice in the dynar of the type of the received message
195 * @param[out] payload: where to write the payload of the incomming message
196 * @return the error code (or no_error).
198 * Every message of a type not in the accepted list received before the one
199 * waited will be queued and used by subsequent call to this function or
202 * If you are interested in the context, pass the address of a s_gras_msg_cb_ctx_t variable.
204 void gras_msg_wait_or(double timeout,
205 xbt_dynar_t msgt_want,
206 gras_msg_cb_ctx_t *ctx,
211 VERB1("Wait %f seconds for several message types",timeout);
212 gras_msg_wait_ext_(timeout,
214 &gras_msg_wait_or_filter, (void*)msgt_want,
217 if (msg.type->ctn_type) {
219 "Message type '%s' convey a payload you must accept",
221 } /* don't check the other side since some of the types may have a payload */
223 if (payload && msg.type->ctn_type) {
224 memcpy(payload,msg.payl,msg.payl_size);
229 *ctx=gras_msg_cb_ctx_new(msg.expe, msg.type, msg.ID,
230 (msg.kind == e_gras_msg_kind_rpccall), 60);
233 *msgt_got = xbt_dynar_search(msgt_want,msg.type);
237 /** \brief Send the data pointed by \a payload as a message of type
238 * \a msgtype to the peer \a sock */
240 gras_msg_send_(gras_socket_t sock,
241 gras_msgtype_t msgtype,
244 if (msgtype->ctn_type) {
246 "Message type '%s' convey a payload you must provide",
249 xbt_assert1(!payload,
250 "No payload was declared for message type '%s'",
254 DEBUG2("Send a oneway message of type '%s'. Payload=%p",
255 msgtype->name,payload);
256 gras_msg_send_ext(sock, e_gras_msg_kind_oneway,0, msgtype, payload);
257 VERB2("Sent a oneway message of type '%s'. Payload=%p",
258 msgtype->name,payload);
261 /** @brief Handle all messages arriving within the given period
263 * @param period: How long to wait for incoming messages (in seconds)
265 * Messages are dealed with just like gras_msg_handle() would do. The
266 * difference is that gras_msg_handle() handles at most one message (or wait up
267 * to timeout second when no message arrives) while this function handles any
268 * amount of messages, and lasts the given period in any case.
271 gras_msg_handleall(double period) {
273 double begin=gras_os_time();
279 if (period - now + begin > 0)
280 gras_msg_handle(period - now + begin);
282 if (e.category != timeout_error)
283 RETHROW0("Error while waiting for messages: %s");
286 } while (now - begin < period);
289 /** @brief Handle an incomming message or timer (or wait up to \a timeOut seconds)
291 * @param timeOut: How long to wait for incoming messages (in seconds)
292 * @return the error code (or no_error).
294 * Any message arriving in the given interval is passed to the callbacks.
296 * @sa gras_msg_handleall().
299 gras_msg_handle(double timeOut) {
308 gras_msg_procdata_t pd=(gras_msg_procdata_t)gras_libdata_by_id(gras_msg_libdata_id);
309 gras_cblist_t *list=NULL;
311 s_gras_msg_cb_ctx_t ctx;
313 int timerexpected, timeouted;
316 VERB1("Handling message within the next %.2fs",timeOut);
318 untiltimer = gras_msg_timer_handle();
319 DEBUG1("Next timer in %f sec", untiltimer);
320 if (untiltimer == 0.0) {
321 /* A timer was already elapsed and handled */
324 if (untiltimer != -1.0) {
326 timeOut = MIN(timeOut, untiltimer);
331 /* get a message (from the queue or from the net) */
333 if (xbt_dynar_length(pd->msg_queue)) {
334 DEBUG0("Get a message from the queue");
335 xbt_dynar_shift(pd->msg_queue,&msg);
338 xbt_queue_shift_timed(pd->msg_received,&msg,timeOut);
339 // msg.expe = gras_trp_select(timeOut);
341 if (e.category != timeout_error)
351 /* A timer elapsed before the arrival of any message even if we select()ed a bit */
352 untiltimer = gras_msg_timer_handle();
353 if (untiltimer == 0.0) {
354 /* we served a timer, we're done */
357 xbt_assert1(untiltimer>0, "Negative timer (%f). I'm 'puzzeled'", untiltimer);
358 WARN1("No timer elapsed, in contrary to expectations (next in %f sec)",
360 THROW1(timeout_error,0,
361 "No timer elapsed, in contrary to expectations (next in %f sec)",
366 /* select timeouted, and no timer elapsed. Nothing to do */
367 THROW1(timeout_error, 0, "No new message or timer (delay was %f)",
373 /* A message was already there or arrived in the meanwhile. handle it */
374 xbt_dynar_foreach(pd->cbl_list,cpt,list) {
375 if (list->id == msg.type->code) {
382 INFO3("No callback for message '%s' from %s:%d. Queue it for later gras_msg_wait() use.",
384 gras_socket_peer_name(msg.expe),gras_socket_peer_port(msg.expe));
385 xbt_dynar_push(pd->msg_waitqueue,&msg);
386 return; /* FIXME: maybe we should call ourselves again until the end of the timer or a proper msg is got */
389 ctx.expeditor = msg.expe;
391 ctx.msgtype = msg.type;
392 ctx.answer_due = (msg.kind == e_gras_msg_kind_rpccall);
395 case e_gras_msg_kind_oneway:
396 case e_gras_msg_kind_rpccall:
399 xbt_dynar_foreach(list->cbs,cpt,cb) {
401 DEBUG4("Use the callback #%d (@%p) for incomming msg %s (payload_size=%d)",
402 cpt+1,cb,msg.type->name,msg.payl_size);
403 if (!(*cb)(&ctx,msg.payl)) {
404 /* cb handled the message */
412 if (msg.type->kind == e_gras_msg_kind_rpccall) {
413 char *old_file=e.file;
414 /* The callback raised an exception, propagate it on the network */
416 /* Make sure we reduce the file name to its basename to avoid issues in tests */
417 char *new_file=strrchr(e.file,'/');
420 /* the exception is born on this machine */
421 e.host = (char*)gras_os_myname();
422 xbt_ex_setup_backtrace(&e);
424 VERB5("Propagate %s exception ('%s') from '%s' RPC cb back to %s:%d",
425 (e.remote ? "remote" : "local"),
428 gras_socket_peer_name(msg.expe),
429 gras_socket_peer_port(msg.expe));
430 gras_msg_send_ext(msg.expe, e_gras_msg_kind_rpcerror,
431 msg.ID, msg.type, &e);
437 RETHROW0("Callback raised an exception: %s");
441 xbt_assert1(! ctx.answer_due,
442 "Bug in user code: RPC callback to message '%s' didn't call gras_msg_rpcreturn",msg.type->name);
444 CRITICAL1("BUGS BOTH IN USER CODE (RPC callback to message '%s' didn't call gras_msg_rpcreturn) "
445 "AND IN SIMGRID (process wasn't killed by an assert)",msg.type->name);
447 THROW1(mismatch_error,0,
448 "Message '%s' refused by all registered callbacks", msg.type->name);
449 /* FIXME: gras_datadesc_free not implemented => leaking the payload */
453 case e_gras_msg_kind_rpcanswer:
454 INFO1("Unexpected RPC answer discarded (type: %s)", msg.type->name);
455 WARN0("FIXME: gras_datadesc_free not implemented => leaking the payload");
458 case e_gras_msg_kind_rpcerror:
459 INFO1("Unexpected RPC error discarded (type: %s)", msg.type->name);
460 WARN0("FIXME: gras_datadesc_free not implemented => leaking the payload");
464 THROW1(unknown_error,0,
465 "Cannot handle messages of kind %d yet",msg.type->kind);