3 /* messaging - Function related to messaging (code shared between RL and SG)*/
5 /* Copyright (c) 2003, 2004 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. */
11 #include "xbt/ex_interface.h"
12 #include "gras/Msg/msg_private.h"
13 #include "gras/Virtu/virtu_interface.h"
14 #include "gras/DataDesc/datadesc_interface.h"
15 #include "gras/Transport/transport_interface.h" /* gras_select */
16 #include "portable.h" /* execinfo when available to propagate exceptions */
19 #define MIN(a,b) ((a) < (b) ? (a) : (b))
22 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(gras_msg,gras,"High level messaging");
24 xbt_set_t _gras_msgtype_set = NULL;
25 static char *make_namev(const char *name, short int ver);
27 const char *e_gras_msg_kind_names[e_gras_msg_kind_count]=
28 {"UNKNOWN","ONEWAY","RPC call","RPC answer","RPC error"};
31 * Creating procdata for this module
33 static void *gras_msg_procdata_new() {
34 gras_msg_procdata_t res = xbt_new(s_gras_msg_procdata_t,1);
36 res->name = xbt_strdup("gras_msg");
38 res->msg_queue = xbt_dynar_new(sizeof(s_gras_msg_t), NULL);
39 res->cbl_list = xbt_dynar_new(sizeof(gras_cblist_t *),gras_cbl_free);
40 res->timers = xbt_dynar_new(sizeof(s_gras_timer_t), NULL);
46 * Freeing procdata for this module
48 static void gras_msg_procdata_free(void *data) {
49 gras_msg_procdata_t res = (gras_msg_procdata_t)data;
51 xbt_dynar_free(&( res->msg_queue ));
52 xbt_dynar_free(&( res->cbl_list ));
53 xbt_dynar_free(&( res->timers ));
62 int gras_msg_libdata_id;
63 void gras_msg_register() {
64 gras_msg_libdata_id = gras_procdata_add("gras_msg",gras_msg_procdata_new, gras_msg_procdata_free);
68 * Initialize this submodule.
70 void gras_msg_init(void) {
71 /* only initialize once */
72 if (_gras_msgtype_set != NULL)
75 VERB0("Initializing Msg");
77 _gras_msgtype_set = xbt_set_new();
79 memcpy(_GRAS_header,"GRAS", 4);
80 _GRAS_header[4]=GRAS_PROTOCOL_VERSION;
81 _GRAS_header[5]=(char)GRAS_THISARCH;
85 * Finalize the msg module
90 xbt_set_free(&_gras_msgtype_set);
96 void gras_msgtype_free(void *t) {
97 gras_msgtype_t msgtype=(gras_msgtype_t)t;
104 * Dump all declared message types (debugging purpose)
106 void gras_msgtype_dumpall(void) {
107 xbt_set_cursor_t cursor;
108 gras_msgtype_t msgtype=NULL;
110 INFO0("Dump of all registered messages:");
111 xbt_set_foreach(_gras_msgtype_set, cursor, msgtype) {
112 INFO6(" Message name: %s (v%d) %s; %s%s%s",
113 msgtype->name, msgtype->version, e_gras_msg_kind_names[msgtype->kind],
114 gras_datadesc_get_name(msgtype->ctn_type),
115 (msgtype->kind==e_gras_msg_kind_rpccall ? " -> ":""),
116 (msgtype->kind==e_gras_msg_kind_rpccall ? gras_datadesc_get_name(msgtype->answer_type) : ""));
124 * Returns the versionned name of the message. If the version is 0, that's
125 * the name unchanged. Pay attention to this before free'ing the result.
127 static char *make_namev(const char *name, short int ver) {
133 namev = (char*)xbt_malloc(strlen(name)+2+3+1);
136 sprintf(namev,"%s_v%d",name,ver);
141 /* Internal function doing the crude work of registering messages */
143 gras_msgtype_declare_ext(const char *name,
145 e_gras_msg_kind_t kind,
146 gras_datadesc_type_t payload_request,
147 gras_datadesc_type_t payload_answer) {
149 gras_msgtype_t msgtype=NULL;
150 char *namev=make_namev(name,version);
151 volatile int found = 0;
155 msgtype = (gras_msgtype_t)xbt_set_get_by_name(_gras_msgtype_set,namev);
158 if (e.category != not_found_error)
164 VERB2("Re-register version %d of message '%s' (same kind & payload, ignored).",
166 xbt_assert3(msgtype->kind == kind,
167 "Message %s re-registered as a %s (it was known as a %s)",
168 namev,e_gras_msg_kind_names[kind],e_gras_msg_kind_names[msgtype->kind]);
169 xbt_assert3(!gras_datadesc_type_cmp(msgtype->ctn_type, payload_request),
170 "Message %s re-registred with another payload (%s was %s)",
171 namev,gras_datadesc_get_name(payload_request),
172 gras_datadesc_get_name(msgtype->ctn_type));
174 xbt_assert3(!gras_datadesc_type_cmp(msgtype->answer_type, payload_answer),
175 "Message %s re-registred with another answer payload (%s was %s)",
176 namev,gras_datadesc_get_name(payload_answer),
177 gras_datadesc_get_name(msgtype->answer_type));
179 return ; /* do really ignore it */
183 VERB4("Register version %d of message '%s' "
184 "(payload: %s; answer payload: %s).",
185 version, name, gras_datadesc_get_name(payload_request),
186 gras_datadesc_get_name(payload_answer));
188 msgtype = xbt_new(s_gras_msgtype_t,1);
189 msgtype->name = (namev == name ? strdup(name) : namev);
190 msgtype->name_len = strlen(namev);
191 msgtype->version = version;
192 msgtype->kind = kind;
193 msgtype->ctn_type = payload_request;
194 msgtype->answer_type = payload_answer;
196 xbt_set_add(_gras_msgtype_set, (xbt_set_elm_t)msgtype,
201 /** @brief declare a new message type of the given name. It only accepts the given datadesc as payload
203 * @param name: name as it should be used for logging messages (must be uniq)
204 * @param payload: datadescription of the payload
206 void gras_msgtype_declare(const char *name,
207 gras_datadesc_type_t payload) {
208 gras_msgtype_declare_ext(name, 0, e_gras_msg_kind_oneway, payload, NULL);
213 /** @brief declare a new versionned message type of the given name and payload
215 * @param name: name as it should be used for logging messages (must be uniq)
216 * @param version: something like versionning symbol
217 * @param payload: datadescription of the payload
219 * Registers a message to the GRAS mechanism. Use this version instead of
220 * gras_msgtype_declare when you change the semantic or syntax of a message and
221 * want your programs to be able to deal with both versions. Internally, each
222 * will be handled as an independent message type, so you can register
223 * differents for each of them.
226 gras_msgtype_declare_v(const char *name,
228 gras_datadesc_type_t payload) {
230 gras_msgtype_declare_ext(name, version,
231 e_gras_msg_kind_oneway, payload, NULL);
234 /** @brief retrieve an existing message type from its name (raises an exception if it does not exist). */
235 gras_msgtype_t gras_msgtype_by_name (const char *name) {
236 return gras_msgtype_by_namev(name,0);
238 /** @brief retrieve an existing message type from its name (or NULL if it does not exist). */
239 gras_msgtype_t gras_msgtype_by_name_or_null (const char *name) {
241 gras_msgtype_t res = NULL;
244 res = gras_msgtype_by_namev(name,0);
252 /** @brief retrieve an existing message type from its name and version. */
253 gras_msgtype_t gras_msgtype_by_namev(const char *name,
255 gras_msgtype_t res = NULL;
256 char *namev = make_namev(name,version);
257 volatile int found=0;
261 res = (gras_msgtype_t)xbt_set_get_by_name(_gras_msgtype_set, namev);
267 THROW1(not_found_error,0,"No registred message of that name: %s",name);
274 /** @brief retrieve an existing message type from its name and version. */
275 gras_msgtype_t gras_msgtype_by_id(int id) {
276 return (gras_msgtype_t)xbt_set_get_by_id(_gras_msgtype_set, id);
279 /** \brief Waits for a message to come in over a given socket.
281 * @param timeout: How long should we wait for this message.
282 * @param msgt_want: type of awaited msg (or NULL if I'm enclined to accept any message)
283 * @param expe_want: awaited expeditot (match on hostname, not port; NULL if not relevant)
284 * @param filter: function returning true or false when passed a payload. Messages for which it returns false are not selected. (NULL if not relevant)
285 * @param filter_ctx: context passed as second argument of the filter (a pattern to match?)
286 * @param[out] msg_got: where to write the message we got
288 * Every message of another type received before the one waited will be queued
289 * and used by subsequent call to this function or gras_msg_handle().
293 gras_msg_wait_ext(double timeout,
295 gras_msgtype_t msgt_want,
296 gras_socket_t expe_want,
297 gras_msg_filter_t filter,
300 gras_msg_t msg_got) {
304 gras_msg_procdata_t pd=(gras_msg_procdata_t)gras_libdata_by_id(gras_msg_libdata_id);
307 xbt_assert0(msg_got,"msg_got is an output parameter");
309 start = gras_os_time();
310 VERB1("Waiting for message '%s'",msgt_want?msgt_want->name:"(any)");
312 xbt_dynar_foreach(pd->msg_queue,cpt,msg){
313 if ( ( !msgt_want || (msg.type->code == msgt_want->code))
314 && (!expe_want || (!strcmp( gras_socket_peer_name(msg.expe),
315 gras_socket_peer_name(expe_want))))
316 && (!filter || filter(&msg,filter_ctx))) {
318 memcpy(msg_got,&msg,sizeof(s_gras_msg_t));
319 xbt_dynar_cursor_rm(pd->msg_queue, &cpt);
320 VERB0("The waited message was queued");
329 restart_receive: /* Goto here when the receive of a message failed */
332 memset(&msg,sizeof(msg),0);
335 msg.expe = gras_trp_select(timeout ? timeout - now + start : 0);
336 gras_msg_recv(msg.expe, &msg);
338 if (e.category == system_error &&
339 !strncmp("Socket closed by remote side",e.msg,
340 strlen("Socket closed by remote side"))) {
348 goto restart_receive;
350 DEBUG0("Got a message from the socket");
352 if ( ( !msgt_want || (msg.type->code == msgt_want->code))
353 && (!expe_want || (!strcmp( gras_socket_peer_name(msg.expe),
354 gras_socket_peer_name(expe_want))))
355 && (!filter || filter(&msg,filter_ctx))) {
357 memcpy(msg_got,&msg,sizeof(s_gras_msg_t));
358 DEBUG0("Message matches expectations. Use it.");
361 DEBUG0("Message does not match expectations. Queue it.");
363 /* not expected msg type. Queue it for later */
364 xbt_dynar_push(pd->msg_queue,&msg);
367 if (now - start + 0.001 > timeout) {
368 THROW1(timeout_error, now-start+0.001-timeout,
369 "Timeout while waiting for msg '%s'",
370 msgt_want?msgt_want->name:"(any)");
376 /** \brief Waits for a message to come in over a given socket.
378 * @param timeout: How long should we wait for this message.
379 * @param msgt_want: type of awaited msg
380 * @param[out] expeditor: where to create a socket to answer the incomming message
381 * @param[out] payload: where to write the payload of the incomming message
382 * @return the error code (or no_error).
384 * Every message of another type received before the one waited will be queued
385 * and used by subsequent call to this function or gras_msg_handle().
388 gras_msg_wait(double timeout,
389 gras_msgtype_t msgt_want,
390 gras_socket_t *expeditor,
394 gras_msg_wait_ext(timeout,
395 msgt_want, NULL, NULL, NULL,
398 if (msgt_want->ctn_type) {
400 "Message type '%s' convey a payload you must accept",
403 xbt_assert1(!payload,
404 "No payload was declared for message type '%s'",
409 memcpy(payload,msg.payl,msg.payl_size);
414 *expeditor = msg.expe;
417 static int gras_msg_wait_or_filter(gras_msg_t msg, void *ctx) {
418 xbt_dynar_t dyn=(xbt_dynar_t)ctx;
419 int res = xbt_dynar_member(dyn,msg->type);
421 VERB1("Got matching message (type=%s)",msg->type->name);
423 VERB0("Got message not matching our expectations");
426 /** \brief Waits for a message to come in over a given socket.
428 * @param timeout: How long should we wait for this message.
429 * @param msgt_want: a dynar containing all accepted message type
430 * @param[out] ctx: the context of received message (in case it's a RPC call we want to answer to)
431 * @param[out] msgt_got: indice in the dynar of the type of the received message
432 * @param[out] payload: where to write the payload of the incomming message
433 * @return the error code (or no_error).
435 * Every message of a type not in the accepted list received before the one
436 * waited will be queued and used by subsequent call to this function or
439 * If you are interested in the context, pass the address of a s_gras_msg_cb_ctx_t variable.
441 void gras_msg_wait_or(double timeout,
442 xbt_dynar_t msgt_want,
443 gras_msg_cb_ctx_t *ctx,
448 VERB1("Wait %f seconds for several message types",timeout);
449 gras_msg_wait_ext(timeout,
451 &gras_msg_wait_or_filter, (void*)msgt_want,
454 if (msg.type->ctn_type) {
456 "Message type '%s' convey a payload you must accept",
458 } /* don't check the other side since some of the types may have a payload */
460 if (payload && msg.type->ctn_type) {
461 memcpy(payload,msg.payl,msg.payl_size);
466 *ctx=gras_msg_cb_ctx_new(msg.expe, msg.type, msg.ID,
467 (msg.kind == e_gras_msg_kind_rpccall), 60);
470 *msgt_got = xbt_dynar_search(msgt_want,msg.type);
474 /** \brief Send the data pointed by \a payload as a message of type
475 * \a msgtype to the peer \a sock */
477 gras_msg_send(gras_socket_t sock,
478 gras_msgtype_t msgtype,
481 if (msgtype->ctn_type) {
483 "Message type '%s' convey a payload you must provide",
486 xbt_assert1(!payload,
487 "No payload was declared for message type '%s'",
491 DEBUG2("Send a oneway message of type '%s'. Payload=%p",
492 msgtype->name,payload);
493 gras_msg_send_ext(sock, e_gras_msg_kind_oneway,0, msgtype, payload);
494 VERB2("Sent a oneway message of type '%s'. Payload=%p",
495 msgtype->name,payload);
498 /** @brief Handle all messages arriving within the given period
500 * @param period: How long to wait for incoming messages (in seconds)
502 * Messages are dealed with just like gras_msg_handle() would do. The
503 * difference is that gras_msg_handle() handles at most one message (or wait up
504 * to timeout second when no message arrives) while this function handles any
505 * amount of messages, and lasts the given period in any case.
508 gras_msg_handleall(double period) {
510 double begin=gras_os_time();
516 if (period - now + begin > 0)
517 gras_msg_handle(period - now + begin);
519 if (e.category != timeout_error)
520 RETHROW0("Error while waiting for messages: %s");
523 } while (now - begin < period);
526 /** @brief Handle an incomming message or timer (or wait up to \a timeOut seconds)
528 * @param timeOut: How long to wait for incoming messages (in seconds)
529 * @return the error code (or no_error).
531 * Messages are passed to the callbacks. See also gras_msg_handleall().
534 gras_msg_handle(double timeOut) {
543 gras_msg_procdata_t pd=(gras_msg_procdata_t)gras_libdata_by_id(gras_msg_libdata_id);
544 gras_cblist_t *list=NULL;
546 s_gras_msg_cb_ctx_t ctx;
548 int timerexpected, timeouted;
551 VERB1("Handling message within the next %.2fs",timeOut);
553 untiltimer = gras_msg_timer_handle();
554 DEBUG1("Next timer in %f sec", untiltimer);
555 if (untiltimer == 0.0) {
556 /* A timer was already elapsed and handled */
559 if (untiltimer != -1.0) {
561 timeOut = MIN(timeOut, untiltimer);
566 /* get a message (from the queue or from the net) */
568 if (xbt_dynar_length(pd->msg_queue)) {
569 DEBUG0("Get a message from the queue");
570 xbt_dynar_shift(pd->msg_queue,&msg);
573 msg.expe = gras_trp_select(timeOut);
575 if (e.category != timeout_error)
583 /* FIXME: if not the right kind, queue it and recall ourself or goto >:-) */
584 gras_msg_recv(msg.expe, &msg);
585 DEBUG1("Received a msg from the socket kind:%s",
586 e_gras_msg_kind_names[msg.kind]);
589 RETHROW4("Error while receiving a message on select()ed socket %p to [%s]%s:%d: %s",
591 gras_socket_peer_proc(msg.expe),gras_socket_peer_name(msg.expe),
592 gras_socket_peer_port(msg.expe));
600 /* A timer elapsed before the arrival of any message even if we select()ed a bit */
601 untiltimer = gras_msg_timer_handle();
602 if (untiltimer == 0.0) {
603 /* we served a timer, we're done */
606 xbt_assert1(untiltimer>0, "Negative timer (%f). I'm 'puzzeled'", untiltimer);
607 WARN1("No timer elapsed, in contrary to expectations (next in %f sec)",
609 THROW1(timeout_error,0,
610 "No timer elapsed, in contrary to expectations (next in %f sec)",
615 /* select timeouted, and no timer elapsed. Nothing to do */
616 THROW1(timeout_error, 0, "No new message or timer (delay was %f)",
622 /* A message was already there or arrived in the meanwhile. handle it */
623 xbt_dynar_foreach(pd->cbl_list,cpt,list) {
624 if (list->id == msg.type->code) {
631 INFO3("No callback for the incomming '%s' message (from %s:%d). Discarded.",
633 gras_socket_peer_name(msg.expe),gras_socket_peer_port(msg.expe));
634 WARN0("FIXME: gras_datadesc_free not implemented => leaking the payload");
638 ctx.expeditor = msg.expe;
640 ctx.msgtype = msg.type;
641 ctx.answer_due = (msg.kind == e_gras_msg_kind_rpccall);
644 case e_gras_msg_kind_oneway:
645 case e_gras_msg_kind_rpccall:
648 xbt_dynar_foreach(list->cbs,cpt,cb) {
650 DEBUG4("Use the callback #%d (@%p) for incomming msg %s (payload_size=%d)",
651 cpt+1,cb,msg.type->name,msg.payl_size);
652 if ((*cb)(&ctx,msg.payl)) {
653 /* cb handled the message */
661 if (msg.type->kind == e_gras_msg_kind_rpccall) {
662 /* The callback raised an exception, propagate it on the network */
663 if (!e.remote) { /* the exception is born on this machine */
664 e.host = (char*)gras_os_myname();
665 xbt_ex_setup_backtrace(&e);
667 VERB5("Propagate %s exception ('%s') from '%s' RPC cb back to %s:%d",
668 (e.remote ? "remote" : "local"),
671 gras_socket_peer_name(msg.expe),
672 gras_socket_peer_port(msg.expe));
673 gras_msg_send_ext(msg.expe, e_gras_msg_kind_rpcerror,
674 msg.ID, msg.type, &e);
679 RETHROW0("Callback raised an exception: %s");
682 xbt_assert0(!(ctx.answer_due),
683 "RPC callback didn't call gras_msg_rpcreturn");
686 THROW1(mismatch_error,0,
687 "Message '%s' refused by all registered callbacks", msg.type->name);
688 /* FIXME: gras_datadesc_free not implemented => leaking the payload */
692 case e_gras_msg_kind_rpcanswer:
693 INFO1("Unexpected RPC answer discarded (type: %s)", msg.type->name);
694 WARN0("FIXME: gras_datadesc_free not implemented => leaking the payload");
697 case e_gras_msg_kind_rpcerror:
698 INFO1("Unexpected RPC error discarded (type: %s)", msg.type->name);
699 WARN0("FIXME: gras_datadesc_free not implemented => leaking the payload");
703 THROW1(unknown_error,0,
704 "Cannot handle messages of kind %d yet",msg.type->kind);
710 gras_cbl_free(void *data){
711 gras_cblist_t *list=*(void**)data;
713 xbt_dynar_free(&( list->cbs ));
718 /** \brief Bind the given callback to the given message type
720 * Several callbacks can be attached to a given message type. The lastly added one will get the message first, and
721 * if it returns false, the message will be passed to the second one.
722 * And so on until one of the callbacks accepts the message.
725 gras_cb_register(gras_msgtype_t msgtype,
727 gras_msg_procdata_t pd=(gras_msg_procdata_t)gras_libdata_by_id(gras_msg_libdata_id);
728 gras_cblist_t *list=NULL;
731 DEBUG2("Register %p as callback to '%s'",cb,msgtype->name);
733 /* search the list of cb for this message on this host (creating if NULL) */
734 xbt_dynar_foreach(pd->cbl_list,cpt,list) {
735 if (list->id == msgtype->code) {
742 /* First cb? Create room */
743 list = xbt_new(gras_cblist_t,1);
744 list->id = msgtype->code;
745 list->cbs = xbt_dynar_new(sizeof(gras_msg_cb_t), NULL);
746 xbt_dynar_push(pd->cbl_list,&list);
749 /* Insert the new one into the set */
750 xbt_dynar_insert_at(list->cbs,0,&cb);
753 /** \brief Unbind the given callback from the given message type */
755 gras_cb_unregister(gras_msgtype_t msgtype,
758 gras_msg_procdata_t pd=(gras_msg_procdata_t)gras_libdata_by_id(gras_msg_libdata_id);
760 gras_msg_cb_t cb_cpt;
764 /* search the list of cb for this message on this host */
765 xbt_dynar_foreach(pd->cbl_list,cpt,list) {
766 if (list->id == msgtype->code) {
773 /* Remove it from the set */
775 xbt_dynar_foreach(list->cbs,cpt,cb_cpt) {
777 xbt_dynar_cursor_rm(list->cbs, &cpt);
783 VERB1("Ignoring removal of unexisting callback to msg id %d",
787 /** \brief Retrieve the expeditor of the message */
788 gras_socket_t gras_msg_cb_ctx_from(gras_msg_cb_ctx_t ctx) {
789 return ctx->expeditor;
791 /* \brief Creates a new message exchange context (user should never have to) */
792 gras_msg_cb_ctx_t gras_msg_cb_ctx_new(gras_socket_t expe,
793 gras_msgtype_t msgtype,
794 unsigned long int ID,
797 gras_msg_cb_ctx_t res=xbt_new(s_gras_msg_cb_ctx_t,1);
798 res->expeditor = expe;
799 res->msgtype = msgtype;
801 res->timeout = timeout;
802 res->answer_due = answer_due;
806 /* \brief Frees a message exchange context
808 * This function is mainly useful with \ref gras_msg_wait_or, ie seldom.
810 void gras_msg_cb_ctx_free(gras_msg_cb_ctx_t ctx) {