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 "gras/Msg/msg_private.h"
12 #include "gras/DataDesc/datadesc_interface.h"
13 #include "gras/Transport/transport_interface.h" /* gras_trp_chunk_send/recv */
14 #include "gras/Virtu/virtu_interface.h"
16 #define MIN(a,b) ((a) < (b) ? (a) : (b))
18 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(gras_msg,gras,"High level messaging");
20 xbt_set_t _gras_msgtype_set = NULL;
21 static char GRAS_header[6];
22 static char *make_namev(const char *name, short int ver);
25 * Creating procdata for this module
27 static void *gras_msg_procdata_new() {
28 gras_msg_procdata_t res = xbt_new(s_gras_msg_procdata_t,1);
30 res->msg_queue = xbt_dynar_new(sizeof(s_gras_msg_t), NULL);
31 res->cbl_list = xbt_dynar_new(sizeof(gras_cblist_t *),gras_cbl_free);
32 res->timers = xbt_dynar_new(sizeof(s_gras_timer_t), NULL);
38 * Freeing procdata for this module
40 static void gras_msg_procdata_free(void *data) {
41 gras_msg_procdata_t res = (gras_msg_procdata_t)data;
43 xbt_dynar_free(&( res->msg_queue ));
44 xbt_dynar_free(&( res->cbl_list ));
45 xbt_dynar_free(&( res->timers ));
51 void gras_msg_register() {
52 gras_procdata_add("gras_msg",gras_msg_procdata_new, gras_msg_procdata_free);
56 * Initialize this submodule.
58 void gras_msg_init(void) {
59 /* only initialize once */
60 if (_gras_msgtype_set != NULL)
63 VERB0("Initializing Msg");
65 _gras_msgtype_set = xbt_set_new();
67 memcpy(GRAS_header,"GRAS", 4);
68 GRAS_header[4]=GRAS_PROTOCOL_VERSION;
69 GRAS_header[5]=(char)GRAS_THISARCH;
73 * Finalize the msg module
78 xbt_set_free(&_gras_msgtype_set);
84 void gras_msgtype_free(void *t) {
85 gras_msgtype_t msgtype=(gras_msgtype_t)t;
95 * Returns the versionned name of the message. If the version is 0, that's
96 * the name unchanged. Pay attention to this before free'ing the result.
98 static char *make_namev(const char *name, short int ver) {
104 namev = (char*)xbt_malloc(strlen(name)+2+3+1);
107 sprintf(namev,"%s_v%d",name,ver);
112 /** @brief declare a new message type of the given name. It only accepts the given datadesc as payload
114 * @param name: name as it should be used for logging messages (must be uniq)
115 * @param payload: datadescription of the payload
117 void gras_msgtype_declare(const char *name,
118 gras_datadesc_type_t payload) {
119 gras_msgtype_declare_v(name, 0, payload);
122 /** @brief declare a new versionned message type of the given name and payload
124 * @param name: name as it should be used for logging messages (must be uniq)
125 * @param version: something like versionning symbol
126 * @param payload: datadescription of the payload
128 * Registers a message to the GRAS mechanism. Use this version instead of
129 * gras_msgtype_declare when you change the semantic or syntax of a message and
130 * want your programs to be able to deal with both versions. Internally, each
131 * will be handled as an independent message type, so you can register
132 * differents for each of them.
135 gras_msgtype_declare_v(const char *name,
137 gras_datadesc_type_t payload) {
140 gras_msgtype_t msgtype;
141 char *namev=make_namev(name,version);
144 WARN1("Message %s has NULL payload",name);
146 errcode = xbt_set_get_by_name(_gras_msgtype_set,
147 namev,(xbt_set_elm_t*)&msgtype);
149 if (errcode == no_error) {
150 VERB2("Re-register version %d of message '%s' (same payload, ignored).",
152 xbt_assert3(!gras_datadesc_type_cmp(msgtype->ctn_type, payload),
153 "Message %s re-registred with another payload (%s was %s)",
154 namev,gras_datadesc_get_name(payload),
155 gras_datadesc_get_name(msgtype->ctn_type));
157 return ; /* do really ignore it */
160 xbt_assert_error(mismatch_error); /* expect this error */
161 VERB3("Register version %d of message '%s' (payload: %s).",
162 version, name, gras_datadesc_get_name(payload));
164 msgtype = xbt_new(s_gras_msgtype_t,1);
165 msgtype->name = (namev == name ? strdup(name) : namev);
166 msgtype->name_len = strlen(namev);
167 msgtype->version = version;
168 msgtype->ctn_type = payload;
170 xbt_set_add(_gras_msgtype_set, (xbt_set_elm_t)msgtype,
174 /** @brief retrive an existing message type from its name. */
175 gras_msgtype_t gras_msgtype_by_name (const char *name) {
176 return gras_msgtype_by_namev(name,0);
179 /** @brief retrive an existing message type from its name and version. */
180 gras_msgtype_t gras_msgtype_by_namev(const char *name,
185 char *namev = make_namev(name,version);
187 errcode = xbt_set_get_by_name(_gras_msgtype_set, namev,
188 (xbt_set_elm_t*)&res);
189 if (errcode != no_error)
192 WARN1("msgtype_by_name(%s) returns NULL",namev);
199 /** \brief Send the data pointed by \a payload as a message of type
200 * \a msgtype to the peer \a sock */
202 gras_msg_send(gras_socket_t sock,
203 gras_msgtype_t msgtype,
207 static gras_datadesc_type_t string_type=NULL;
210 RAISE0(mismatch_error,
211 "Cannot send the NULL message (did msgtype_by_name fail?)");
214 string_type = gras_datadesc_by_name("string");
215 xbt_assert(string_type);
218 DEBUG3("send '%s' to %s:%d", msgtype->name,
219 gras_socket_peer_name(sock),gras_socket_peer_port(sock));
220 TRY(gras_trp_chunk_send(sock, GRAS_header, 6));
222 TRY(gras_datadesc_send(sock, string_type, &msgtype->name));
223 TRY(gras_datadesc_send(sock, msgtype->ctn_type, payload));
224 TRY(gras_trp_flush(sock));
229 * receive the next message on the given socket.
232 gras_msg_recv(gras_socket_t sock,
233 gras_msgtype_t *msgtype,
238 static gras_datadesc_type_t string_type=NULL;
245 string_type=gras_datadesc_by_name("string");
246 xbt_assert(string_type);
249 TRY(gras_trp_chunk_recv(sock, header, 6));
250 for (cpt=0; cpt<4; cpt++)
251 if (header[cpt] != GRAS_header[cpt])
252 RAISE2(mismatch_error,"Incoming bytes do not look like a GRAS message (header='%.4s' not '%.4s')",header,GRAS_header);
253 if (header[4] != GRAS_header[4])
254 RAISE2(mismatch_error,"GRAS protocol mismatch (got %d, use %d)",
255 (int)header[4], (int)GRAS_header[4]);
256 r_arch = (int)header[5];
257 DEBUG2("Handle an incoming message using protocol %d (remote is %s)",
258 (int)header[4],gras_datadesc_arch_name(r_arch));
260 TRY(gras_datadesc_recv(sock, string_type, r_arch, &msg_name));
261 errcode = xbt_set_get_by_name(_gras_msgtype_set,
262 msg_name,(xbt_set_elm_t*)msgtype);
263 if (errcode != no_error)
265 "Got error %s while retrieving the type associated to messages '%s'",
266 xbt_error_name(errcode),msg_name);
267 /* FIXME: Survive unknown messages */
270 *payload_size=gras_datadesc_size((*msgtype)->ctn_type);
271 xbt_assert2(*payload_size > 0,
273 "Dynamic array as payload is forbided for now (FIXME?).",
274 "Reference to dynamic array is allowed.");
275 *payload = xbt_malloc(*payload_size);
276 TRY(gras_datadesc_recv(sock, (*msgtype)->ctn_type, r_arch, *payload));
281 /** \brief Waits for a message to come in over a given socket.
283 * @param timeout: How long should we wait for this message.
284 * @param msgt_want: type of awaited msg
285 * @param[out] expeditor: where to create a socket to answer the incomming message
286 * @param[out] payload: where to write the payload of the incomming message
287 * @return the error code (or no_error).
289 * Every message of another type received before the one waited will be queued
290 * and used by subsequent call to this function or gras_msg_handle().
293 gras_msg_wait(double timeout,
294 gras_msgtype_t msgt_want,
295 gras_socket_t *expeditor,
298 gras_msgtype_t msgt_got;
300 int payload_size_got;
303 gras_msg_procdata_t pd=(gras_msg_procdata_t)gras_libdata_get("gras_msg");
311 RAISE0(mismatch_error,
312 "Cannot wait for the NULL message (did msgtype_by_name fail?)");
314 VERB1("Waiting for message %s",msgt_want->name);
316 start = now = gras_os_time();
318 xbt_dynar_foreach(pd->msg_queue,cpt,msg){
319 if (msg.type->code == msgt_want->code) {
320 *expeditor = msg.expeditor;
321 memcpy(payload, msg.payload, msg.payload_size);
323 xbt_dynar_cursor_rm(pd->msg_queue, &cpt);
324 VERB0("The waited message was queued");
330 TRY(gras_trp_select(timeout - now + start, expeditor));
331 TRY(gras_msg_recv(*expeditor, &msgt_got, &payload_got, &payload_size_got));
332 if (msgt_got->code == msgt_want->code) {
333 memcpy(payload, payload_got, payload_size_got);
335 VERB0("Got waited message");
339 /* not expected msg type. Queue it for later */
340 msg.expeditor = *expeditor;
342 msg.payload = payload;
343 msg.payload_size = payload_size_got;
344 xbt_dynar_push(pd->msg_queue,&msg);
347 if (now - start + 0.001 < timeout) {
348 RAISE1(timeout_error,"Timeout while waiting for msg %s",msgt_want->name);
355 /** @brief Handle an incomming message or timer (or wait up to \a timeOut seconds)
357 * @param timeOut: How long to wait for incoming messages (in seconds)
358 * @return the error code (or no_error).
360 * Messages are passed to the callbacks.
363 gras_msg_handle(double timeOut) {
371 gras_socket_t expeditor;
374 gras_msgtype_t msgtype;
376 gras_msg_procdata_t pd=(gras_msg_procdata_t)gras_libdata_get("gras_msg");
377 gras_cblist_t *list=NULL;
382 VERB1("Handling message within the next %.2fs",timeOut);
384 untiltimer = gras_msg_timer_handle();
385 DEBUG2("[%.0f] Next timer in %f sec", gras_os_time(), untiltimer);
386 if (untiltimer == 0.0) {
387 /* A timer was already elapsed and handled */
390 if (untiltimer != -1.0) {
392 timeOut = MIN(timeOut, untiltimer);
397 /* get a message (from the queue or from the net) */
398 if (xbt_dynar_length(pd->msg_queue)) {
399 DEBUG0("Get a message from the queue");
400 xbt_dynar_shift(pd->msg_queue,&msg);
401 expeditor = msg.expeditor;
403 payload = msg.payload;
406 errcode = gras_trp_select(timeOut, &expeditor);
407 if (errcode != no_error && errcode != timeout_error)
409 if (errcode != timeout_error)
410 TRY(gras_msg_recv(expeditor, &msgtype, &payload, &payload_size));
413 if (errcode == timeout_error ) {
416 /* A timer elapsed before the arrival of any message even if we select()ed a bit */
417 untiltimer = gras_msg_timer_handle();
418 if (untiltimer == 0.0) {
421 xbt_assert1(untiltimer>0, "Negative timer (%f). I'm puzzeled", untiltimer);
422 ERROR1("No timer elapsed, in contrary to expectations (next in %f sec)",
424 return timeout_error;
428 /* select timeouted, and no timer elapsed. Nothing to do */
429 return timeout_error;
434 /* A message was already there or arrived in the meanwhile. handle it */
435 xbt_dynar_foreach(pd->cbl_list,cpt,list) {
436 if (list->id == msgtype->code) {
443 INFO1("No callback for the incomming '%s' message. Discarded.",
445 WARN0("FIXME: gras_datadesc_free not implemented => leaking the payload");
449 xbt_dynar_foreach(list->cbs,cpt,cb) {
450 VERB3("Use the callback #%d (@%p) for incomming msg %s",
451 cpt+1,cb,msgtype->name);
452 if ((*cb)(expeditor,payload)) {
453 /* cb handled the message */
459 INFO1("Message '%s' refused by all registered callbacks", msgtype->name);
460 WARN0("FIXME: gras_datadesc_free not implemented => leaking the payload");
461 return mismatch_error;
465 gras_cbl_free(void *data){
466 gras_cblist_t *list=*(void**)data;
468 xbt_dynar_free(&( list->cbs ));
473 /** \brief Bind the given callback to the given message type
475 * Several callbacks can be attached to a given message type. The lastly added one will get the message first, and
476 * if it returns false, the message will be passed to the second one.
477 * And so on until one of the callbacks accepts the message.
480 gras_cb_register(gras_msgtype_t msgtype,
482 gras_msg_procdata_t pd=(gras_msg_procdata_t)gras_libdata_get("gras_msg");
483 gras_cblist_t *list=NULL;
486 DEBUG2("Register %p as callback to %s",cb,msgtype->name);
488 /* search the list of cb for this message on this host (creating if NULL) */
489 xbt_dynar_foreach(pd->cbl_list,cpt,list) {
490 if (list->id == msgtype->code) {
497 /* First cb? Create room */
498 list = xbt_new(gras_cblist_t,1);
499 list->id = msgtype->code;
500 list->cbs = xbt_dynar_new(sizeof(gras_msg_cb_t), NULL);
501 xbt_dynar_push(pd->cbl_list,&list);
504 /* Insert the new one into the set */
505 xbt_dynar_insert_at(list->cbs,0,&cb);
508 /** \brief Unbind the given callback from the given message type */
510 gras_cb_unregister(gras_msgtype_t msgtype,
513 gras_msg_procdata_t pd=(gras_msg_procdata_t)gras_libdata_get("gras_msg");
515 gras_msg_cb_t cb_cpt;
519 /* search the list of cb for this message on this host */
520 xbt_dynar_foreach(pd->cbl_list,cpt,list) {
521 if (list->id == msgtype->code) {
528 /* Remove it from the set */
530 xbt_dynar_foreach(list->cbs,cpt,cb_cpt) {
532 xbt_dynar_cursor_rm(list->cbs, &cpt);
538 VERB1("Ignoring removal of unexisting callback to msg id %d",