3 ==================================================================================
4 Copyright (c) 2019-2020 Nokia
5 Copyright (c) 2018-2020 AT&T Intellectual Property.
7 Licensed under the Apache License, Version 2.0 (the "License") ;
8 you may not use this file except in compliance with the License.
9 You may obtain a copy of the License at
11 http://www.apache.org/licenses/LICENSE-2.0
13 Unless required by applicable law or agreed to in writing, software
14 distributed under the License is distributed on an "AS IS" BASIS,
15 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 See the License for the specific language governing permissions and
17 limitations under the License.
18 ==================================================================================
22 Mnemonic: rt_generic_static.c
23 Abstract: These are route table functions which are not specific to the
24 underlying protocol. rtable_static, and rtable_nng_static
25 have transport provider specific code.
27 This file must be included before the nng/nano specific file as
30 Author: E. Scott Daniels
34 #ifndef rt_generic_static_c
35 #define rt_generic_static_c
44 #include <sys/types.h>
50 #include <RIC_message_types.h> // needed for route manager messages
56 Passed to a symtab foreach callback to construct a list of pointers from
59 typedef struct thing_list {
60 int error; // if a realloc failed, this will be set
67 // ---- debugging/testing -------------------------------------------------------------------------
70 Dump some stats for an endpoint in the RT. This is generally called to
71 verify endpoints after a table load/change.
73 This is called by the for-each mechanism of the symtab and the prototype is
74 fixe; we don't really use some of the parms, but have dummy references to
75 keep sonar from complaining.
77 static void ep_stats( void* st, void* entry, char const* name, void* thing, void* vcounter ) {
81 if( (ep = (endpoint_t *) thing) == NULL ) {
85 if( (counter = (int *) vcounter) != NULL ) {
88 rmr_vlog( RMR_VL_DEBUG, "ep_stas: nil counter %p %p %p", st, entry, name ); // dummy refs
92 rmr_vlog_force( RMR_VL_DEBUG, "rt endpoint: target=%s open=%d\n", ep->name, ep->open );
96 Called to count meid entries in the table. The meid points to an 'owning' endpoint
97 so we can list what we find
99 See note in ep_stats about dummy refs.
101 static void meid_stats( void* st, void* entry, char const* name, void* thing, void* vcounter ) {
105 if( (ep = (endpoint_t *) thing) == NULL ) {
109 if( (counter = (int *) vcounter) != NULL ) {
112 rmr_vlog( RMR_VL_DEBUG, "meid_stas: nil counter %p %p %p", st, entry, name ); // dummy refs
115 rmr_vlog_force( RMR_VL_DEBUG, "meid=%s owner=%s open=%d\n", name, ep->name, ep->open );
119 Dump counts for an endpoint in the RT. The vid parm is assumed to point to
120 the 'source' information and is added to each message.
122 See note above about dummy references.
124 static void ep_counts( void* st, void* entry, char const* name, void* thing, void* vid ) {
128 if( (ep = (endpoint_t *) thing) == NULL ) {
129 rmr_vlog( RMR_VL_DEBUG, "ep_counts: nil thing %p %p %p", st, entry, name ); // dummy refs
133 if( (id = (char *) vid) == NULL ) {
137 rmr_vlog_force( RMR_VL_INFO, "sends: ts=%lld src=%s target=%s open=%d succ=%lld fail=%lld (hard=%lld soft=%lld)\n",
138 (long long) time( NULL ),
142 ep->scounts[EPSC_GOOD],
143 ep->scounts[EPSC_FAIL] + ep->scounts[EPSC_TRANS],
144 ep->scounts[EPSC_FAIL],
145 ep->scounts[EPSC_TRANS] );
149 Dump stats for a route entry in the table.
151 static void rte_stats( void* st, void* entry, char const* name, void* thing, void* vcounter ) {
153 rtable_ent_t const* rte; // thing is really an rte
157 if( (rte = (rtable_ent_t *) thing) == NULL ) {
158 rmr_vlog( RMR_VL_DEBUG, "rte_stats: nil thing %p %p %p", st, entry, name ); // dummy refs
162 if( (counter = (int *) vcounter) != NULL ) {
166 mtype = rte->key & 0xffff;
167 sid = (int) (rte->key >> 32);
169 rmr_vlog_force( RMR_VL_DEBUG, "rte: key=%016lx mtype=%4d sid=%4d nrrg=%2d refs=%d\n", rte->key, mtype, sid, rte->nrrgroups, rte->refs );
173 Given a route table, cause some stats to be spit out.
175 static void rt_stats( route_table_t* rt ) {
179 rmr_vlog_force( RMR_VL_DEBUG, "rtstats: nil table\n" );
183 counter = (int *) malloc( sizeof( int ) );
185 rmr_vlog_force( RMR_VL_DEBUG, "route table stats:\n" );
186 rmr_vlog_force( RMR_VL_DEBUG, "route table endpoints:\n" );
187 rmr_sym_foreach_class( rt->ephash, RT_NAME_SPACE, ep_stats, counter ); // run endpoints (names) in the active table
188 rmr_vlog_force( RMR_VL_DEBUG, "rtable: %d known endpoints\n", *counter );
190 rmr_vlog_force( RMR_VL_DEBUG, "route table entries:\n" );
192 rmr_sym_foreach_class( rt->hash, RT_MT_SPACE, rte_stats, counter ); // run message type entries
193 rmr_vlog_force( RMR_VL_DEBUG, "rtable: %d mt entries in table\n", *counter );
195 rmr_vlog_force( RMR_VL_DEBUG, "route table meid map:\n" );
197 rmr_sym_foreach_class( rt->hash, RT_ME_SPACE, meid_stats, counter ); // run meid space
198 rmr_vlog_force( RMR_VL_DEBUG, "rtable: %d meids in map\n", *counter );
204 Given a route table, cause endpoint counters to be written to stderr. The id
205 parm is written as the "source" in the output.
207 static void rt_epcounts( route_table_t* rt, char* id ) {
209 rmr_vlog_force( RMR_VL_INFO, "endpoint: no counts: empty table\n" );
213 rmr_sym_foreach_class( rt->ephash, 1, ep_counts, id ); // run endpoints in the active table
217 static void dump_tables( uta_ctx_t *ctx ) {
218 if( ctx->old_rtable != NULL ) {
219 rmr_vlog_force( RMR_VL_DEBUG, "old route table: (ref_count=%d)\n", ctx->old_rtable->ref_count );
220 rt_stats( ctx->old_rtable );
222 rmr_vlog_force( RMR_VL_DEBUG, "old route table was empty\n" );
224 rmr_vlog_force( RMR_VL_DEBUG, "new route table:\n" );
225 rt_stats( ctx->rtable );
228 // ------------ route manager communication -------------------------------------------------
230 Send a request for a table update to the route manager. Updates come in
231 async, so send and go.
233 pctx is the private context for the thread; ctx is the application context
234 that we need to be able to send the application ID in case rt mgr needs to
235 use it to idenfity us.
237 Returns 0 if we were not able to send a request.
239 static int send_update_req( uta_ctx_t* pctx, uta_ctx_t* ctx ) {
243 if( ctx->rtg_whid < 0 ) {
247 smsg = rmr_alloc_msg( pctx, 1024 );
249 smsg->mtype = RMRRM_REQ_TABLE;
251 snprintf( smsg->payload, 1024, "%s ts=%ld\n", ctx->my_name, time( NULL ) );
252 rmr_vlog( RMR_VL_INFO, "rmr_rtc: requesting table: (%s) whid=%d\n", smsg->payload, ctx->rtg_whid );
253 smsg->len = strlen( smsg->payload ) + 1;
255 smsg = rmr_wh_send_msg( pctx, ctx->rtg_whid, smsg );
256 if( (state = smsg->state) != RMR_OK ) {
257 rmr_vlog( RMR_VL_INFO, "rmr_rtc: send failed: %d whid=%d\n", smsg->state, ctx->rtg_whid );
258 rmr_wh_close( ctx, ctx->rtg_whid ); // send failed, assume connection lost
262 rmr_free_msg( smsg );
269 Send an ack to the route table manager for a table ID that we are
270 processing. State is 1 for OK, and 0 for failed. Reason might
271 be populated if we know why there was a failure.
273 Context should be the PRIVATE context that we use for messages
274 to route manger and NOT the user's context.
276 If a message buffere is passed we use that and use return to sender
277 assuming that this might be a response to a call and that is needed
278 to send back to the proper calling thread. If msg is nil, we allocate
281 static void send_rt_ack( uta_ctx_t* ctx, rmr_mbuf_t* smsg, char* table_id, int state, char* reason ) {
283 int payload_size = 1024;
285 if( ctx == NULL || ctx->rtg_whid < 0 ) {
289 if( ctx->flags & CFL_NO_RTACK ) { // don't ack if reading from file etc
294 smsg = rmr_realloc_payload( smsg, payload_size, FALSE, FALSE ); // ensure it's large enough to send a response
297 smsg = rmr_alloc_msg( ctx, payload_size );
301 smsg->mtype = RMRRM_TABLE_STATE;
303 snprintf( smsg->payload, payload_size-1, "%s %s %s\n", state == RMR_OK ? "OK" : "ERR",
304 table_id == NULL ? "<id-missing>" : table_id, reason == NULL ? "" : reason );
306 smsg->len = strlen( smsg->payload ) + 1;
308 rmr_vlog( RMR_VL_INFO, "rmr_rtc: sending table state: (%s) state=%d whid=%d table=%s\n", smsg->payload, state, ctx->rtg_whid, table_id );
310 smsg = rmr_rts_msg( ctx, smsg );
312 smsg = rmr_wh_send_msg( ctx, ctx->rtg_whid, smsg );
314 if( (state = smsg->state) != RMR_OK ) {
315 rmr_vlog( RMR_VL_WARN, "unable to send table state: %d\n", smsg->state );
316 rmr_wh_close( ctx, ctx->rtg_whid ); // send failed, assume connection lost
321 rmr_free_msg( smsg ); // if not our message we must free the leftovers
326 // ---- alarm generation --------------------------------------------------------------------------
329 Given the user's context (not the thread private context) look to see if the application isn't
330 working fast enough and we're dropping messages. If the drop counter has changed since the last
331 peeked, and we have not raised an alarm, then we will alarm. If the counter hasn't changed, then we
332 set a timer and if the counter still hasn't changed when it expires we will clear the alarm.
334 The private context is what we use to send so as not to interfere with the user flow.
336 static void alarm_if_drops( uta_ctx_t* uctx, uta_ctx_t* pctx ) {
337 static int alarm_raised = 0;
338 static int ok2clear = 0; // time that we can clear
339 static int lastd = 0; // the last counter value so we can compute delta
340 static int prob_id = 0; // problem ID we assume alarm manager handles dups between processes
342 rmr_vlog( RMR_VL_DEBUG, "checking for drops... raised=%d 0k2clear=%d lastd=%d probid=%d\n", alarm_raised, ok2clear, lastd, prob_id );
343 if( ! alarm_raised ) {
344 if( uctx->dcount - lastd == 0 ) { // not actively dropping, ok to do nothing
349 uta_alarm( pctx, ALARM_DROPS | ALARM_RAISE, prob_id, "application running slow; RMR is dropping messages" );
350 rmr_vlog( RMR_VL_INFO, "drop alarm raised" );
352 if( uctx->dcount - lastd != 0 ) { // still dropping or dropping again; we've alarmed so nothing to do
353 lastd = uctx->dcount;
354 ok2clear = 0; // reset the timer
358 if( ok2clear == 0 ) { // first round where not dropping
359 ok2clear = time( NULL ) + 60; // we'll clear the alarm in 60s
361 if( time( NULL ) > ok2clear ) { // things still stable after expiry
362 rmr_vlog( RMR_VL_INFO, "drop alarm cleared\n" );
364 uta_alarm( pctx, ALARM_DROPS | ALARM_CLEAR, prob_id++, "RMR message dropping has stopped" );
370 // ---- utility -----------------------------------------------------------------------------------
372 Little diddy to trim whitespace and trailing comments. Like shell, trailing comments
373 must be at the start of a word (i.e. must be immediatly preceeded by whitespace).
375 static char* clip( char* buf ) {
378 while( *buf && isspace( *buf ) ) { // skip leading whitespace
382 if( (tok = strchr( buf, '#' )) != NULL ) {
384 return buf; // just push back; leading comment sym handled there
387 if( isspace( *(tok-1) ) ) {
392 for( tok = buf + (strlen( buf ) - 1); tok > buf && isspace( *tok ); tok-- ); // trim trailing spaces too
399 This accepts a pointer to a nil terminated string, and ensures that there is a
400 newline as the last character. If there is not, a new buffer is allocated and
401 the newline is added. If a new buffer is allocated, the buffer passed in is
402 freed. The function returns a pointer which the caller should use, and must
403 free. In the event of an error, a nil pointer is returned.
405 static char* ensure_nlterm( char* buf ) {
413 nb = buf; // default to returning original as is
420 if( *buf != '\n' ) { // not a newline; realloc
421 rmr_vlog( RMR_VL_WARN, "rmr buf_check: input buffer was not newline terminated (file missing final \\n?)\n" );
422 nb = strdup( " \n" );
429 if( buf[len-1] != '\n' ) { // not newline terminated, realloc
430 rmr_vlog( RMR_VL_WARN, "rmr buf_check: input buffer was not newline terminated (file missing final \\n?)\n" );
431 if( (nb = (char *) malloc( sizeof( char ) * (len + 2) )) != NULL ) {
432 memcpy( nb, buf, len );
433 *(nb+len) = '\n'; // insert \n and nil into the two extra bytes we allocated
445 Roll the new table into the active and the active into the old table. We
446 must have the lock on the active table to do this. It's possible that there
447 is no active table (first load), so we have to account for that (no locking).
449 static void roll_tables( uta_ctx_t* ctx ) {
451 if( ctx->new_rtable == NULL || ctx->new_rtable->error ) {
452 rmr_vlog( RMR_VL_WARN, "new route table NOT rolled in: nil pointer or error indicated\n" );
453 ctx->old_rtable = ctx->new_rtable;
454 ctx->new_rtable = NULL;
458 if( ctx->rtable != NULL ) { // initially there isn't one, so must check!
459 pthread_mutex_lock( ctx->rtgate ); // must hold lock to move to active
460 ctx->old_rtable = ctx->rtable; // currently active becomes old and allowed to 'drain'
461 ctx->rtable = ctx->new_rtable; // one we've been adding to becomes active
462 pthread_mutex_unlock( ctx->rtgate );
464 ctx->old_rtable = NULL; // ensure there isn't an old reference
465 ctx->rtable = ctx->new_rtable; // make new the active one
468 ctx->new_rtable = NULL;
472 Given a thing list, extend the array of pointers by 1/2 of the current
473 number allocated. If we cannot realloc an array, then we set the error
474 flag. Unlikely, but will prevent a crash, AND will prevent us from
475 trying to use the table since we couldn't capture everything.
477 static void extend_things( thing_list_t* tl ) {
486 old_alloc = tl->nalloc; // capture current things
487 old_things = tl->things;
488 old_names = tl->names;
490 tl->nalloc += tl->nalloc/2; // new allocation size
492 tl->things = (void **) malloc( sizeof( void * ) * tl->nalloc ); // allocate larger arrays
493 tl->names = (const char **) malloc( sizeof( char * ) * tl->nalloc );
495 if( tl->things == NULL || tl->names == NULL ){ // if either failed, then set error
500 memcpy( tl->things, old_things, sizeof( void * ) * old_alloc );
501 memcpy( tl->names, old_names, sizeof( void * ) * old_alloc );
507 // ------------ entry update functions ---------------------------------------------------------------
509 Given a message type create a route table entry and add to the hash keyed on the
510 message type. Once in the hash, endpoints can be added with uta_add_ep. Size
511 is the number of group slots to allocate in the entry.
513 static rtable_ent_t* uta_add_rte( route_table_t* rt, uint64_t key, int nrrgroups ) {
515 rtable_ent_t* old_rte; // entry which was already in the table for the key
521 if( (rte = (rtable_ent_t *) malloc( sizeof( *rte ) )) == NULL ) {
522 rmr_vlog( RMR_VL_ERR, "rmr_add_rte: malloc failed for entry\n" );
525 memset( rte, 0, sizeof( *rte ) );
529 if( nrrgroups < 0 ) { // zero is allowed as %meid entries have no groups
534 if( (rte->rrgroups = (rrgroup_t **) malloc( sizeof( rrgroup_t * ) * nrrgroups )) == NULL ) {
538 memset( rte->rrgroups, 0, sizeof( rrgroup_t *) * nrrgroups );
540 rte->rrgroups = NULL;
543 rte->nrrgroups = nrrgroups;
545 if( (old_rte = rmr_sym_pull( rt->hash, key )) != NULL ) {
546 del_rte( NULL, NULL, NULL, old_rte, NULL ); // dec the ref counter and trash if unreferenced
549 rmr_sym_map( rt->hash, key, rte ); // add to hash using numeric mtype as key
551 if( DEBUG ) rmr_vlog( RMR_VL_DEBUG, "route table entry created: k=%llx groups=%d\n", (long long) key, nrrgroups );
556 This accepts partially parsed information from an rte or mse record sent by route manager or read from
558 ts_field is the msg-type,sender field
559 subid is the integer subscription id
560 rr_field is the endpoint information for round robening message over
562 If all goes well, this will add an RTE to the table under construction.
564 The ts_field is checked to see if we should ingest this record. We ingest if one of
566 there is no sender info (a generic entry for all)
567 there is sender and our host:port matches one of the senders
568 the sender info is an IP address that matches one of our IP addresses
570 static void build_entry( uta_ctx_t* ctx, char* ts_field, uint32_t subid, char* rr_field, int vlevel ) {
571 rtable_ent_t* rte; // route table entry added
574 uint64_t key = 0; // the symtab key will be mtype or sub_id+mtype
578 int ngtoks; // number of tokens in the group list
579 int grp; // index into group list
580 int cgidx; // contiguous group index (prevents the addition of a contiguous group without ep)
581 int has_ep = FALSE; // indicates if an endpoint was added in a given round robin group
583 ts_field = clip( ts_field ); // ditch extra whitespace and trailing comments
584 rr_field = clip( rr_field );
586 if( ((tok = strchr( ts_field, ',' )) == NULL ) || // no sender names (generic entry for all)
587 (uta_has_str( ts_field, ctx->my_name, ',', 127) >= 0) || // our name is in the list
588 has_myip( ts_field, ctx->ip_list, ',', 127 ) ) { // the list has one of our IP addresses
590 key = build_rt_key( subid, atoi( ts_field ) );
592 if( DEBUG > 1 || (vlevel > 1) ) rmr_vlog_force( RMR_VL_DEBUG, "create rte for mtype=%s subid=%d key=%lx\n", ts_field, subid, key );
594 if( (ngtoks = uta_tokenise( rr_field, gtokens, 64, ';' )) > 0 ) { // split round robin groups
595 if( strcmp( gtokens[0], "%meid" ) == 0 ) {
596 ngtoks = 0; // special indicator that uses meid to find endpoint, no rrobin
598 rte = uta_add_rte( ctx->new_rtable, key, ngtoks ); // get/create entry for this key
599 rte->mtype = atoi( ts_field ); // capture mtype for debugging
601 for( grp = 0, cgidx = 0; grp < ngtoks; grp++ ) {
602 if( (ntoks = uta_rmip_tokenise( gtokens[grp], ctx->ip_list, tokens, 64, ',' )) > 0 ) { // remove any references to our ip addrs
603 for( i = 0; i < ntoks; i++ ) {
604 if( strcmp( tokens[i], ctx->my_name ) != 0 ) { // don't add if it is us -- cannot send to ourself
605 if( DEBUG > 1 || (vlevel > 1)) rmr_vlog_force( RMR_VL_DEBUG, "add endpoint ts=%s %s\n", ts_field, tokens[i] );
606 uta_add_ep( ctx->new_rtable, rte, tokens[i], cgidx );
611 cgidx++; // only increment to the next contiguous group if the current one has at least one endpoint
618 if( DEBUG || (vlevel > 2) ) {
619 rmr_vlog_force( RMR_VL_DEBUG, "build entry: ts_entry not of form msg-type,sender: %s\n", ts_field );
625 Trash_entry takes a partially parsed record from the input and
626 will delete the entry if the sender,mtype matches us or it's a
627 generic mtype. The refernce in the new table is removed and the
628 refcounter for the actual rte is decreased. If that ref count is
629 0 then the memory is freed (handled byh the del_rte call).
631 static void trash_entry( uta_ctx_t* ctx, char* ts_field, uint32_t subid, int vlevel ) {
632 rtable_ent_t* rte; // route table entry to be 'deleted'
635 uint64_t key = 0; // the symtab key will be mtype or sub_id+mtype
638 if( ctx == NULL || ctx->new_rtable == NULL || ctx->new_rtable->hash == NULL ) {
642 ts_field = clip( ts_field ); // ditch extra whitespace and trailing comments
644 if( ((tok = strchr( ts_field, ',' )) == NULL ) || // no sender names (generic entry for all)
645 (uta_has_str( ts_field, ctx->my_name, ',', 127) >= 0) || // our name is in the list
646 has_myip( ts_field, ctx->ip_list, ',', 127 ) ) { // the list has one of our IP addresses
648 key = build_rt_key( subid, atoi( ts_field ) );
649 rte = rmr_sym_pull( ctx->new_rtable->hash, key ); // get it
651 if( DEBUG || (vlevel > 1) ) {
652 rmr_vlog_force( RMR_VL_DEBUG, "delete rte for mtype=%s subid=%d key=%08lx\n", ts_field, subid, key );
654 rmr_sym_ndel( ctx->new_rtable->hash, key ); // clear from the new table
655 del_rte( NULL, NULL, NULL, rte, NULL ); // clean up the memory: reduce ref and free if ref == 0
657 if( DEBUG || (vlevel > 1) ) {
658 rmr_vlog_force( RMR_VL_DEBUG, "delete could not find rte for mtype=%s subid=%d key=%lx\n", ts_field, subid, key );
662 if( DEBUG ) rmr_vlog( RMR_VL_DEBUG, "delete rte skipped: %s\n", ts_field );
666 // -------------------------- parse functions --------------------------------------------------
669 Given the tokens from an mme_ar (meid add/replace) entry, add the entries.
670 the 'owner' which should be the dns name or IP address of an enpoint
671 the meid_list is a space separated list of me IDs
673 This function assumes the caller has vetted the pointers as needed.
675 For each meid in the list, an entry is pushed into the hash which references the owner
676 endpoint such that when the meid is used to route a message it references the endpoint
679 static void parse_meid_ar( route_table_t* rtab, char* owner, char* meid_list, int vlevel ) {
685 endpoint_t* ep; // endpoint struct for the owner
687 owner = clip( owner ); // ditch extra whitespace and trailing comments
688 meid_list = clip( meid_list );
690 ntoks = uta_tokenise( meid_list, tokens, 128, ' ' );
691 for( i = 0; i < ntoks; i++ ) {
692 if( (ep = rt_ensure_ep( rtab, owner )) != NULL ) {
693 state = rmr_sym_put( rtab->hash, tokens[i], RT_ME_SPACE, ep ); // slam this one in if new; replace if there
694 if( DEBUG || (vlevel > 1) ) rmr_vlog_force( RMR_VL_DEBUG, "parse_meid_ar: add/replace meid: %s owned by: %s state=%d\n", tokens[i], owner, state );
696 rmr_vlog( RMR_VL_WARN, "rmr parse_meid_ar: unable to create an endpoint for owner: %s", owner );
702 Given the tokens from an mme_del, delete the listed meid entries from the new
703 table. The list is a space separated list of meids.
705 The meids in the hash reference endpoints which are never deleted and so
706 the only thing that we need to do here is to remove the meid from the hash.
708 This function assumes the caller has vetted the pointers as needed.
710 static void parse_meid_del( route_table_t* rtab, char* meid_list, int vlevel ) {
716 if( rtab->hash == NULL ) {
720 meid_list = clip( meid_list );
722 ntoks = uta_tokenise( meid_list, tokens, 128, ' ' );
723 for( i = 0; i < ntoks; i++ ) {
724 rmr_sym_del( rtab->hash, tokens[i], RT_ME_SPACE ); // and it only took my little finger to blow it away!
725 if( DEBUG || (vlevel > 1) ) rmr_vlog_force( RMR_VL_DEBUG, "parse_meid_del: meid deleted: %s\n", tokens[i] );
730 Parse a partially parsed meid record. Tokens[0] should be one of:
731 meid_map, mme_ar, mme_del.
733 pctx is the private context needed to return an ack/nack using the provided
734 message buffer with the route managers address info.
736 static void meid_parser( uta_ctx_t* ctx, uta_ctx_t* pctx, rmr_mbuf_t* mbuf, char** tokens, int ntoks, int vlevel ) {
739 if( tokens == NULL || ntoks < 1 ) {
740 return; // silent but should never happen
743 if( ntoks < 2 ) { // must have at least two for any valid request record
744 rmr_vlog( RMR_VL_ERR, "meid_parse: not enough tokens on %s record\n", tokens[0] );
748 if( strcmp( tokens[0], "meid_map" ) == 0 ) { // start or end of the meid map update
749 tokens[1] = clip( tokens[1] );
750 if( *(tokens[1]) == 's' ) {
751 if( ctx->new_rtable != NULL ) { // one in progress? this forces it out
752 if( DEBUG > 1 || (vlevel > 1) ) rmr_vlog_force( RMR_VL_DEBUG, "meid map start: dropping incomplete table\n" );
753 uta_rt_drop( ctx->new_rtable );
754 ctx->new_rtable = NULL;
755 send_rt_ack( pctx, mbuf, ctx->table_id, !RMR_OK, "table not complete" ); // nack the one that was pending as and never made it
758 if( ctx->table_id != NULL ) {
759 free( ctx->table_id );
762 ctx->table_id = strdup( clip( tokens[2] ) );
764 ctx->table_id = NULL;
767 ctx->new_rtable = prep_new_rt( ctx, ALL ); // start with a clone of everything (mtype, endpoint refs and meid)
768 ctx->new_rtable->mupdates = 0;
770 if( DEBUG || (vlevel > 1) ) rmr_vlog_force( RMR_VL_DEBUG, "meid_parse: meid map start found\n" );
772 if( strcmp( tokens[1], "end" ) == 0 ) { // wrap up the table we were building
773 if( ntoks > 2 ) { // meid_map | end | <count> |??? given
774 if( ctx->new_rtable->mupdates != atoi( tokens[2] ) ) { // count they added didn't match what we received
775 rmr_vlog( RMR_VL_ERR, "meid_parse: meid map update had wrong number of records: received %d expected %s\n",
776 ctx->new_rtable->mupdates, tokens[2] );
777 snprintf( wbuf, sizeof( wbuf ), "missing table records: expected %s got %d\n", tokens[2], ctx->new_rtable->updates );
778 send_rt_ack( pctx, mbuf, ctx->table_id, !RMR_OK, wbuf );
779 uta_rt_drop( ctx->new_rtable );
780 ctx->new_rtable = NULL;
784 if( DEBUG ) rmr_vlog( RMR_VL_DEBUG, "meid_parse: meid map update ended; found expected number of entries: %s\n", tokens[2] );
787 if( ctx->new_rtable ) {
788 roll_tables( ctx ); // roll active to old, and new to active with proper locking
789 if( DEBUG > 1 || (vlevel > 1) ) rmr_vlog_force( RMR_VL_DEBUG, "end of meid map noticed\n" );
790 send_rt_ack( pctx, mbuf, ctx->table_id, RMR_OK, NULL );
793 if( ctx->old_rtable != NULL ) {
794 rmr_vlog_force( RMR_VL_DEBUG, "old route table: (ref_count=%d)\n", ctx->old_rtable->ref_count );
795 rt_stats( ctx->old_rtable );
797 rmr_vlog_force( RMR_VL_DEBUG, "old route table was empty\n" );
799 rmr_vlog_force( RMR_VL_DEBUG, "new route table:\n" );
800 rt_stats( ctx->rtable );
803 if( DEBUG ) rmr_vlog( RMR_VL_DEBUG, "end of meid map noticed, but one was not started!\n" );
804 ctx->new_rtable = NULL;
812 if( ! ctx->new_rtable ) { // for any other mmap entries, there must be a table in progress or we punt
813 if( DEBUG ) rmr_vlog( RMR_VL_DEBUG, "meid update/delte (%s) encountered, but table update not started\n", tokens[0] );
817 if( strcmp( tokens[0], "mme_ar" ) == 0 ) {
818 if( ntoks < 3 || tokens[1] == NULL || tokens[2] == NULL ) {
819 rmr_vlog( RMR_VL_ERR, "meid_parse: mme_ar record didn't have enough tokens found %d\n", ntoks );
822 parse_meid_ar( ctx->new_rtable, tokens[1], tokens[2], vlevel );
823 ctx->new_rtable->mupdates++;
827 if( strcmp( tokens[0], "mme_del" ) == 0 ) { // ntoks < 2 already validated
828 parse_meid_del( ctx->new_rtable, tokens[1], vlevel );
829 ctx->new_rtable->mupdates++;
835 This will close the current table snarf file (in *.inc) and open a new one.
836 The curent one is renamed. The final file name is determined by the setting of
837 RMR_SNARF_RT, and if not set then the variable RMR_SEED_RT is used and given
838 an additional extension of .snarf. If neither seed or snarf environment vars are
839 set then this does nothing.
841 If this is called before the tmp snarf file is opened, then this just opens the file.
843 static void cycle_snarfed_rt( uta_ctx_t* ctx ) {
844 static int ok2warn = 0; // some warnings squelched on first call
846 char* seed_fname; // the filename from env
847 char tfname[512]; // temp fname
848 char wfname[512]; // working buffer for filename
849 char* snarf_fname = NULL; // prevent overlay of the static table if snarf_rt not given
855 if( (snarf_fname = getenv( ENV_STASH_RT )) == NULL ) { // specific place to stash the rt not given
856 if( (seed_fname = getenv( ENV_SEED_RT )) != NULL ) { // no seed, we leave in the default file
857 memset( wfname, 0, sizeof( wfname ) );
858 snprintf( wfname, sizeof( wfname ) - 1, "%s.stash", seed_fname );
859 snarf_fname = wfname;
863 if( snarf_fname == NULL ) {
867 memset( tfname, 0, sizeof( tfname ) );
868 snprintf( tfname, sizeof( tfname ) -1, "%s.inc", snarf_fname ); // must ensure tmp file is moveable
870 if( ctx->snarf_rt_fd >= 0 ) {
871 char* msg= "### captured from route manager\n";
872 write( ctx->snarf_rt_fd, msg, strlen( msg ) );
873 if( close( ctx->snarf_rt_fd ) < 0 ) {
874 rmr_vlog( RMR_VL_WARN, "rmr_rtc: unable to close working rt snarf file: %s\n", strerror( errno ) );
878 if( unlink( snarf_fname ) < 0 && ok2warn ) { // first time through this can fail and we ignore it
879 rmr_vlog( RMR_VL_WARN, "rmr_rtc: unable to unlink old static table: %s: %s\n", snarf_fname, strerror( errno ) );
882 if( rename( tfname, snarf_fname ) ) {
883 rmr_vlog( RMR_VL_WARN, "rmr_rtc: unable to move new route table to seed aname : %s -> %s: %s\n", tfname, snarf_fname, strerror( errno ) );
885 rmr_vlog( RMR_VL_INFO, "latest route table info saved in: %s\n", snarf_fname );
890 ctx->snarf_rt_fd = open( tfname, O_WRONLY | O_CREAT | O_TRUNC, 0660 );
891 if( ctx->snarf_rt_fd < 0 ) {
892 rmr_vlog( RMR_VL_WARN, "rmr_rtc: unable to open trt file: %s: %s\n", tfname, strerror( errno ) );
894 if( DEBUG ) rmr_vlog( RMR_VL_DEBUG, "rmr_rtc: rt snarf file opened: %s\n", tfname );
899 Parse a single record recevied from the route table generator, or read
900 from a static route table file. Start records cause a new table to
901 be started (if a partial table was received it is discarded. Table
902 entry records are added to the currenly 'in progress' table, and an
903 end record causes the in progress table to be finalised and the
904 currently active table is replaced.
906 The updated table will be activated when the *|end record is encountered.
907 However, to allow for a "double" update, where both the meid map and the
908 route table must be updated at the same time, the end indication on a
909 route table (new or update) may specifiy "hold" which indicates that meid
910 map entries are to follow and the updated route table should be held as
911 pending until the end of the meid map is received and validated.
913 CAUTION: we are assuming that there is a single route/meid map generator
914 and as such only one type of update is received at a time; in other
915 words, the sender cannot mix update records and if there is more than
916 one sender process they must synchronise to avoid issues.
919 For a RT update, we expect:
920 newrt | start | <table-id>
921 newrt | end | <count>
922 rte|<mtype>[,sender]|<endpoint-grp>[;<endpoint-grp>,...]
923 mse|<mtype>[,sender]|<sub-id>|<endpoint-grp>[;<endpoint-grp>,...]
924 mse| <mtype>[,sender] | <sub-id> | %meid
927 For a meid map update we expect:
928 meid_map | start | <table-id>
929 meid_map | end | <count> | <md5-hash>
930 mme_ar | <e2term-id> | <meid0> <meid1>...<meidn>
931 mme_del | <meid0> <meid1>...<meidn>
934 The pctx is our private context that must be used to send acks/status
935 messages back to the route manager. The regular ctx is the ctx that
936 the user has been given and thus that's where we have to hang the route
937 table we're working with.
939 If mbuf is given, and we need to ack, then we ack using the mbuf and a
940 return to sender call (allows route manager to use wh_call() to send
941 an update and rts is required to get that back to the right thread).
942 If mbuf is nil, then one will be allocated (in ack) and a normal wh_send
945 static void parse_rt_rec( uta_ctx_t* ctx, uta_ctx_t* pctx, char* buf, int vlevel, rmr_mbuf_t* mbuf ) {
947 int ntoks; // number of tokens found in something
949 int grp; // group number
950 rtable_ent_t const* rte; // route table entry added
952 char* tok; // pointer into a token or string
959 if( ctx && ctx->snarf_rt_fd >= 0 ) { // if snarfing table as it arrives, write this puppy
960 write( ctx->snarf_rt_fd, buf, strlen( buf ) );
961 write( ctx->snarf_rt_fd, "\n", 1 );
964 while( *buf && isspace( *buf ) ) { // skip leading whitespace
967 for( tok = buf + (strlen( buf ) - 1); tok > buf && isspace( *tok ); tok-- ); // trim trailing spaces too
970 memset( tokens, 0, sizeof( tokens ) );
971 if( (ntoks = uta_tokenise( buf, tokens, 128, '|' )) > 0 ) {
972 tokens[0] = clip( tokens[0] );
973 switch( *(tokens[0]) ) {
974 case 0: // ignore blanks
976 case '#': // and comment lines
979 case 'd': // del | [sender,]mtype | sub-id
980 if( ! ctx->new_rtable ) { // bad sequence, or malloc issue earlier; ignore siliently
985 if( DEBUG ) rmr_vlog( RMR_VL_WARN, "rmr_rtc: del record had too few fields: %d instead of 3\n", ntoks );
989 trash_entry( ctx, tokens[1], atoi( tokens[2] ), vlevel );
990 ctx->new_rtable->updates++;
993 case 'n': // newrt|{start|end}
994 tokens[1] = clip( tokens[1] );
995 if( strcmp( tokens[1], "end" ) == 0 ) { // wrap up the table we were building
996 if( ctx && ctx->snarf_rt_fd >= 0 ) {
997 cycle_snarfed_rt( ctx ); // make it available and open a new one
1001 if( ctx->new_rtable->updates != atoi( tokens[2] ) ) { // count they added didn't match what we received
1002 rmr_vlog( RMR_VL_ERR, "rmr_rtc: RT update had wrong number of records: received %d expected %s\n",
1003 ctx->new_rtable->updates, tokens[2] );
1004 snprintf( wbuf, sizeof( wbuf ), "missing table records: expected %s got %d\n", tokens[2], ctx->new_rtable->updates );
1005 send_rt_ack( pctx, mbuf, ctx->table_id, !RMR_OK, wbuf );
1006 uta_rt_drop( ctx->new_rtable );
1007 ctx->new_rtable = NULL;
1012 if( ctx->new_rtable ) {
1013 roll_tables( ctx ); // roll active to old, and new to active with proper locking
1014 if( DEBUG > 1 || (vlevel > 1) ) {
1015 rmr_vlog( RMR_VL_DEBUG, "end of route table noticed\n" );
1019 send_rt_ack( pctx, mbuf, ctx->table_id, RMR_OK, NULL );
1020 ctx->rtable_ready = 1; // route based sends can now happen
1022 if( DEBUG > 1 ) rmr_vlog_force( RMR_VL_DEBUG, "end of route table noticed, but one was not started!\n" );
1023 ctx->new_rtable = NULL;
1025 } else { // start a new table.
1026 if( ctx->new_rtable != NULL ) { // one in progress? this forces it out
1027 send_rt_ack( pctx, mbuf, ctx->table_id, !RMR_OK, "table not complete" ); // nack the one that was pending as end never made it
1029 if( DEBUG > 1 || (vlevel > 1) ) rmr_vlog_force( RMR_VL_DEBUG, "new table; dropping incomplete table\n" );
1030 uta_rt_drop( ctx->new_rtable );
1031 ctx->new_rtable = NULL;
1034 if( ctx->table_id != NULL ) {
1035 free( ctx->table_id );
1038 ctx->table_id = strdup( clip( tokens[2] ) );
1040 ctx->table_id = NULL;
1043 ctx->new_rtable = prep_new_rt( ctx, SOME ); // wait for old table to drain and shift it back to new
1044 ctx->new_rtable->updates = 0; // init count of entries received
1046 if( DEBUG > 1 || (vlevel > 1) ) rmr_vlog_force( RMR_VL_DEBUG, "start of route table noticed\n" );
1050 case 'm': // mse entry or one of the meid_ records
1051 if( strcmp( tokens[0], "mse" ) == 0 ) {
1052 if( ! ctx->new_rtable ) { // bad sequence, or malloc issue earlier; ignore siliently
1057 if( DEBUG ) rmr_vlog( RMR_VL_WARN, "rmr_rtc: mse record had too few fields: %d instead of 4\n", ntoks );
1061 build_entry( ctx, tokens[1], atoi( tokens[2] ), tokens[3], vlevel );
1062 ctx->new_rtable->updates++;
1064 meid_parser( ctx, pctx, mbuf, tokens, ntoks, vlevel );
1068 case 'r': // assume rt entry
1069 if( ! ctx->new_rtable ) { // bad sequence, or malloc issue earlier; ignore siliently
1073 ctx->new_rtable->updates++;
1074 if( ntoks > 3 ) { // assume new entry with subid last
1075 build_entry( ctx, tokens[1], atoi( tokens[3] ), tokens[2], vlevel );
1077 build_entry( ctx, tokens[1], UNSET_SUBID, tokens[2], vlevel ); // old school entry has no sub id
1081 case 'u': // update current table, not a total replacement
1082 tokens[1] = clip( tokens[1] );
1083 if( strcmp( tokens[1], "end" ) == 0 ) { // wrap up the table we were building
1084 if( ctx->new_rtable == NULL ) { // update table not in progress
1087 if( ctx->snarf_rt_fd >= 0 ) {
1088 cycle_snarfed_rt( ctx ); // make it available and open a new one
1092 if( ctx->new_rtable->updates != atoi( tokens[2] ) ) { // count they added didn't match what we received
1093 rmr_vlog( RMR_VL_ERR, "rmr_rtc: RT update had wrong number of records: received %d expected %s\n",
1094 ctx->new_rtable->updates, tokens[2] );
1095 send_rt_ack( pctx, mbuf, ctx->table_id, !RMR_OK, wbuf );
1096 uta_rt_drop( ctx->new_rtable );
1097 ctx->new_rtable = NULL;
1102 if( ctx->new_rtable ) {
1103 roll_tables( ctx ); // roll active to old, and new to active with proper locking
1104 if( DEBUG > 1 || (vlevel > 1) ) {
1105 rmr_vlog_force( RMR_VL_DEBUG, "end of rt update noticed\n" );
1109 send_rt_ack( pctx, mbuf, ctx->table_id, RMR_OK, NULL );
1110 ctx->rtable_ready = 1; // route based sends can now happen
1112 if( DEBUG > 1 ) rmr_vlog_force( RMR_VL_DEBUG, "end of rt update noticed, but one was not started!\n" );
1113 ctx->new_rtable = NULL;
1115 } else { // start a new table.
1116 if( ctx->new_rtable != NULL ) { // one in progress? this forces it out
1117 if( DEBUG > 1 || (vlevel > 1) ) rmr_vlog_force( RMR_VL_DEBUG, "new table; dropping incomplete table\n" );
1118 send_rt_ack( pctx, mbuf, ctx->table_id, !RMR_OK, "table not complete" ); // nack the one that was pending as end never made it
1119 uta_rt_drop( ctx->new_rtable );
1120 ctx->new_rtable = NULL;
1124 if( ctx->table_id != NULL ) {
1125 free( ctx->table_id );
1127 ctx->table_id = strdup( clip( tokens[2] ) );
1130 ctx->new_rtable = prep_new_rt( ctx, ALL ); // start with a copy of everything in the live table
1131 ctx->new_rtable->updates = 0; // init count of updates received
1133 if( DEBUG > 1 || (vlevel > 1) ) rmr_vlog_force( RMR_VL_DEBUG, "start of rt update noticed\n" );
1138 if( DEBUG ) rmr_vlog( RMR_VL_WARN, "rmr_rtc: unrecognised request: %s\n", tokens[0] );
1145 This function attempts to open a static route table in order to create a 'seed'
1146 table during initialisation. The environment variable RMR_SEED_RT is expected
1147 to contain the necessary path to the file. If missing, or if the file is empty,
1148 no route table will be available until one is received from the generator.
1150 This function is probably most useful for testing situations, or extreme
1151 cases where the routes are static.
1153 static void read_static_rt( uta_ctx_t* ctx, int vlevel ) {
1156 char* fbuf; // buffer with file contents
1157 char* rec; // start of the record
1158 char* eor; // end of the record
1159 int rcount = 0; // record count for debug
1161 if( (fname = getenv( ENV_SEED_RT )) == NULL ) {
1165 if( (fbuf = ensure_nlterm( uta_fib( fname ) ) ) == NULL ) { // read file into a single buffer (nil terminated string)
1166 rmr_vlog( RMR_VL_WARN, "rmr read_static: seed route table could not be opened: %s: %s\n", fname, strerror( errno ) );
1170 if( DEBUG ) rmr_vlog_force( RMR_VL_DEBUG, "seed route table successfully opened: %s\n", fname );
1171 for( eor = fbuf; *eor; eor++ ) { // fix broken systems that use \r or \r\n to terminate records
1172 if( *eor == '\r' ) {
1173 *eor = '\n'; // will look like a blank line which is ok
1178 while( rec && *rec ) {
1180 if( (eor = strchr( rec, '\n' )) != NULL ) {
1183 rmr_vlog( RMR_VL_WARN, "rmr read_static: seed route table had malformed records (missing newline): %s\n", fname );
1184 rmr_vlog( RMR_VL_WARN, "rmr read_static: seed route table not used: %s\n", fname );
1189 parse_rt_rec( ctx, NULL, rec, vlevel, NULL ); // no pvt context as we can't ack
1194 if( DEBUG ) rmr_vlog_force( RMR_VL_DEBUG, "rmr_read_static: seed route table successfully parsed: %d records\n", rcount );
1199 Callback driven for each thing in a symtab. We collect the pointers to those
1200 things for later use (cloning).
1202 static void collect_things( void* st, void* entry, char const* name, void* thing, void* vthing_list ) {
1205 if( (tl = (thing_list_t *) vthing_list) == NULL ) {
1209 if( thing == NULL ) {
1210 rmr_vlog_force( RMR_VL_DEBUG, "collect things given nil thing: %p %p %p\n", st, entry, name ); // dummy ref for sonar
1214 tl->names[tl->nused] = name; // the name/key (space 0 uses int keys, so name can be nil and that is OK)
1215 tl->things[tl->nused++] = thing; // save a reference to the thing
1217 if( tl->nused >= tl->nalloc ) {
1218 extend_things( tl ); // not enough allocated
1223 Called to delete a route table entry struct. We delete the array of endpoint
1224 pointers, but NOT the endpoints referenced as those are referenced from
1227 Route table entries can be concurrently referenced by multiple symtabs, so
1228 the actual delete happens only if decrementing the rte's ref count takes it
1229 to 0. Thus, it is safe to call this function across a symtab when cleaning up
1230 the symtab, or overlaying an entry.
1232 This function uses ONLY the pointer to the rte (thing) and ignores the other
1233 information that symtab foreach function passes (st, entry, and data) which
1234 means that it _can_ safetly be used outside of the foreach setting. If
1235 the function is changed to depend on any of these three, then a stand-alone
1236 rte_cleanup() function should be added and referenced by this, and refererences
1237 to this outside of the foreach world should be changed.
1239 static void del_rte( void* st, void* entry, char const* name, void* thing, void* data ) {
1243 if( (rte = (rtable_ent_t *) thing) == NULL ) {
1244 rmr_vlog_force( RMR_VL_DEBUG, "delrte given nil table: %p %p %p\n", st, entry, name ); // dummy ref for sonar
1249 if( rte->refs > 0 ) { // something still referencing, so it lives
1253 if( rte->rrgroups ) { // clean up the round robin groups
1254 for( i = 0; i < rte->nrrgroups; i++ ) {
1255 if( rte->rrgroups[i] ) {
1256 free( rte->rrgroups[i]->epts ); // ditch list of endpoint pointers (end points are reused; don't trash them)
1257 free( rte->rrgroups[i] ); // but must free the rrg itself too
1262 free( rte->rrgroups );
1265 free( rte ); // finally, drop the potato
1269 Read an entire file into a buffer. We assume for route table files
1270 they will be smallish and so this won't be a problem.
1271 Returns a pointer to the buffer, or nil. Caller must free.
1272 Terminates the buffer with a nil character for string processing.
1274 If we cannot stat the file, we assume it's empty or missing and return
1275 an empty buffer, as opposed to a nil, so the caller can generate defaults
1276 or error if an empty/missing file isn't tolerated.
1278 static char* uta_fib( char const* fname ) {
1280 off_t fsize = 8192; // size of the file
1281 off_t nread; // number of bytes read
1283 char* buf; // input buffer
1285 if( (fd = open( fname, O_RDONLY )) >= 0 ) {
1286 if( fstat( fd, &stats ) >= 0 ) {
1287 if( stats.st_size <= 0 ) { // empty file
1291 fsize = stats.st_size; // stat ok, save the file size
1294 fsize = 8192; // stat failed, we'll leave the file open and try to read a default max of 8k
1298 if( fd < 0 ) { // didn't open or empty
1299 if( (buf = (char *) malloc( sizeof( char ) * 1 )) == NULL ) {
1307 // add a size limit check here
1309 if( (buf = (char *) malloc( sizeof( char ) * fsize + 2 )) == NULL ) { // enough to add nil char to make string
1315 nread = read( fd, buf, fsize );
1316 if( nread < 0 || nread > fsize ) { // failure of some kind
1318 errno = EFBIG; // likely too much to handle
1329 // --------------------- initialisation/creation ---------------------------------------------
1331 Create and initialise a route table; Returns a pointer to the table struct.
1333 static route_table_t* uta_rt_init( uta_ctx_t* ctx ) {
1339 if( (rt = (route_table_t *) malloc( sizeof( route_table_t ) )) == NULL ) {
1343 memset( rt, 0, sizeof( *rt ) );
1345 if( (rt->hash = rmr_sym_alloc( RT_SIZE )) == NULL ) {
1350 rt->gate = ctx->rtgate; // single mutex needed for all route tables
1351 rt->ephash = ctx->ephash; // all route tables share a common endpoint hash
1352 pthread_mutex_init( rt->gate, NULL );
1358 Clones one of the spaces in the given table.
1359 Srt is the source route table, Nrt is the new route table; if nil, we allocate it.
1360 Space is the space in the old table to copy. Space 0 uses an integer key and
1361 references rte structs. All other spaces use a string key and reference endpoints.
1363 static route_table_t* rt_clone_space( uta_ctx_t* ctx, route_table_t* srt, route_table_t* nrt, int space ) {
1364 endpoint_t* ep; // an endpoint (ignore sonar complaint about const*)
1365 rtable_ent_t* rte; // a route table entry (ignore sonar complaint about const*)
1366 void* sst; // source symtab
1367 void* nst; // new symtab
1368 thing_list_t things; // things from the space to copy
1370 int free_on_err = 0;
1375 if( nrt == NULL ) { // make a new table if needed
1377 nrt = uta_rt_init( ctx );
1383 if( srt == NULL ) { // source was nil, just give back the new table
1387 things.nalloc = 2048;
1390 things.things = (void **) malloc( sizeof( void * ) * things.nalloc );
1391 things.names = (const char **) malloc( sizeof( char * ) * things.nalloc );
1392 if( things.things == NULL || things.names == NULL ){
1393 if( things.things != NULL ) {
1394 free( things.things );
1396 if( things.names != NULL ) {
1397 free( things.names );
1401 rmr_sym_free( nrt->hash );
1410 memset( things.things, 0, sizeof( sizeof( void * ) * things.nalloc ) );
1411 memset( things.names, 0, sizeof( char * ) * things.nalloc );
1413 sst = srt->hash; // convenience pointers (src symtab)
1416 rmr_sym_foreach_class( sst, space, collect_things, &things ); // collect things from this space
1417 if( things.error ) { // something happened and capture failed
1418 rmr_vlog( RMR_VL_ERR, "unable to clone route table: unable to capture old contents\n" );
1419 free( things.things );
1420 free( things.names );
1422 rmr_sym_free( nrt->hash );
1431 if( DEBUG ) rmr_vlog_force( RMR_VL_DEBUG, "clone space cloned %d things in space %d\n", things.nused, space );
1432 for( i = 0; i < things.nused; i++ ) {
1433 if( space ) { // string key, epoint reference
1434 ep = (endpoint_t *) things.things[i];
1435 rmr_sym_put( nst, things.names[i], space, ep ); // slam this one into the new table
1437 rte = (rtable_ent_t *) things.things[i];
1438 rte->refs++; // rtes can be removed, so we track references
1439 rmr_sym_map( nst, rte->key, rte ); // add to hash using numeric mtype/sub-id as key (default to space 0)
1443 free( things.things );
1444 free( (void *) things.names );
1449 Given a destination route table (drt), clone from the source (srt) into it.
1450 If drt is nil, alloc a new one. If srt is nil, then nothing is done (except to
1451 allocate the drt if that was nil too). If all is true (1), then we will clone both
1452 the MT and the ME spaces; otherwise only the ME space is cloned.
1454 static route_table_t* uta_rt_clone( uta_ctx_t* ctx, route_table_t* srt, route_table_t* drt, int all ) {
1455 endpoint_t* ep; // an endpoint
1456 rtable_ent_t* rte; // a route table entry
1463 drt = uta_rt_init( ctx );
1469 drt->ephash = ctx->ephash; // all rts reference the same EP symtab
1470 rt_clone_space( ctx, srt, drt, RT_ME_SPACE );
1472 rt_clone_space( ctx, srt, drt, RT_MT_SPACE );
1479 Prepares the "new" route table for populating. If the old_rtable is not nil, then
1480 we wait for it's use count to reach 0. Then the table is cleared, and moved on the
1481 context to be referenced by the new pointer; the old pointer is set to nil.
1483 If the old table doesn't exist, then a new table is created and the new pointer is
1484 set to reference it.
1486 The ME namespace references endpoints which do not need to be released, therefore we
1487 do not need to run that portion of the table to deref like we do for the RTEs.
1489 static route_table_t* prep_new_rt( uta_ctx_t* ctx, int all ) {
1497 if( (rt = ctx->old_rtable) != NULL ) {
1498 ctx->old_rtable = NULL;
1499 while( rt->ref_count > 0 ) { // wait for all who are using to stop
1500 if( counter++ > 1000 ) {
1501 rmr_vlog( RMR_VL_WARN, "rt_prep_newrt: internal mishap, ref count on table seems wedged" );
1505 usleep( 1000 ); // small sleep to yield the processer if that is needed
1508 if( rt->hash != NULL ) {
1509 rmr_sym_foreach_class( rt->hash, 0, del_rte, NULL ); // deref and drop if needed
1510 rmr_sym_clear( rt->hash ); // clear all entries from the old table
1513 rt->error = 0; // table with errors can be here, so endure clear before attempt to load
1518 rt = uta_rt_clone( ctx, ctx->rtable, rt, all ); // also sets the ephash pointer
1519 if( rt != NULL ) { // very small chance for nil, but not zero, so test
1520 rt->ref_count = 0; // take no chances; ensure it's 0!
1522 rmr_vlog( RMR_VL_ERR, "route table clone returned nil; marking dummy table as error\n" );
1523 rt = uta_rt_init( ctx ); // must hav something, but mark it in error state
1532 Given a name, find the endpoint struct in the provided route table.
1534 static endpoint_t* uta_get_ep( route_table_t* rt, char const* ep_name ) {
1536 if( rt == NULL || rt->ephash == NULL || ep_name == NULL || *ep_name == 0 ) {
1540 return rmr_sym_get( rt->ephash, ep_name, 1 );
1544 Drop the given route table. Purge all type 0 entries, then drop the symtab itself.
1545 Does NOT destroy the gate as it's a common gate for ALL route tables.
1547 static void uta_rt_drop( route_table_t* rt ) {
1552 rmr_sym_foreach_class( rt->hash, 0, del_rte, NULL ); // free each rte referenced by the hash, but NOT the endpoints
1553 rmr_sym_free( rt->hash ); // free all of the hash related data
1558 Look up and return the pointer to the endpoint stuct matching the given name.
1559 If not in the hash, a new endpoint is created, added to the hash. Should always
1562 static endpoint_t* rt_ensure_ep( route_table_t* rt, char const* ep_name ) {
1565 if( !rt || !ep_name || ! *ep_name ) {
1566 rmr_vlog( RMR_VL_WARN, "rt_ensure: internal mishap, something undefined rt=%p ep_name=%p\n", rt, ep_name );
1571 if( (ep = uta_get_ep( rt, ep_name )) == NULL ) { // not there yet, make
1572 if( (ep = (endpoint_t *) malloc( sizeof( *ep ) )) == NULL ) {
1573 rmr_vlog( RMR_VL_WARN, "rt_ensure: malloc failed for endpoint creation: %s\n", ep_name );
1578 ep->notify = 1; // show notification on first connection failure
1579 ep->open = 0; // not connected
1580 ep->addr = uta_h2ip( ep_name );
1581 ep->name = strdup( ep_name );
1582 pthread_mutex_init( &ep->gate, NULL ); // init with default attrs
1583 memset( &ep->scounts[0], 0, sizeof( ep->scounts ) );
1585 rmr_sym_put( rt->ephash, ep_name, 1, ep );
1593 Given a session id and message type build a key that can be used to look up the rte in the route
1594 table hash. Sub_id is expected to be -1 if there is no session id associated with the entry.
1596 static inline uint64_t build_rt_key( int32_t sub_id, int32_t mtype ) {
1599 if( sub_id == UNSET_SUBID ) {
1600 key = 0xffffffff00000000 | mtype;
1602 key = (((uint64_t) sub_id) << 32) | (mtype & 0xffffffff);
1609 Given a route table and meid string, find the owner (if known). Returns a pointer to
1610 the endpoint struct or nil.
1612 static inline endpoint_t* get_meid_owner( route_table_t *rt, char const* meid ) {
1613 endpoint_t const* ep; // the ep we found in the hash
1615 if( rt == NULL || rt->hash == NULL || meid == NULL || *meid == 0 ) {
1619 return (endpoint_t *) rmr_sym_get( rt->hash, meid, RT_ME_SPACE );
1623 This returns a pointer to the currently active route table and ups
1624 the reference count so that the route table is not freed while it
1625 is being used. The caller MUST call release_rt() when finished
1628 Care must be taken: the ctx->rtable pointer _could_ change during the time
1629 between the release of the lock and the return. Therefore we MUST grab
1630 the current pointer when we have the lock so that if it does we don't
1631 return a pointer to the wrong table.
1633 This will return NULL if there is no active table.
1635 static inline route_table_t* get_rt( uta_ctx_t* ctx ) {
1636 route_table_t* rrt; // return value
1638 if( ctx == NULL || ctx->rtable == NULL ) {
1642 pthread_mutex_lock( ctx->rtgate ); // must hold lock to bump use
1643 rrt = ctx->rtable; // must stash the pointer while we hold lock
1645 pthread_mutex_unlock( ctx->rtgate );
1647 return rrt; // pointer we upped the count with
1651 This will "release" the route table by reducing the use counter
1652 in the table. The table may not be freed until the counter reaches
1653 0, so it's imparative that the pointer be "released" when it is
1654 fetched by get_rt(). Once the caller has released the table it
1655 may not safely use the pointer that it had.
1657 static inline void release_rt( uta_ctx_t* ctx, route_table_t* rt ) {
1658 if( ctx == NULL || rt == NULL ) {
1662 pthread_mutex_lock( ctx->rtgate ); // must hold lock
1663 if( rt->ref_count > 0 ) { // something smells if it's already 0, don't do antyhing if it is
1666 pthread_mutex_unlock( ctx->rtgate );