1 /* Licensed to the Apache Software Foundation (ASF) under one or more
2 * contributor license agreements. See the NOTICE file distributed with
3 * this work for additional information regarding copyright ownership.
4 * The ASF licenses this file to You under the Apache License, Version 2.0
5 * (the "License"); you may not use this file except in compliance with
6 * the License. You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 /* Load balancer module for Apache proxy */
19 #include "mod_proxy.h"
20 #include "scoreboard.h"
22 #include "apr_version.h"
26 static const char *balancer_mutex_type = "proxy-balancer-shm";
27 ap_slotmem_provider_t *storage = NULL;
29 module AP_MODULE_DECLARE_DATA proxy_balancer_module;
32 * Register our mutex type before the config is read so we
33 * can adjust the mutex settings using the Mutex directive.
35 static int balancer_pre_config(apr_pool_t *pconf, apr_pool_t *plog,
41 rv = ap_mutex_register(pconf, balancer_mutex_type, NULL,
43 if (rv != APR_SUCCESS) {
51 extern void proxy_update_members(proxy_balancer **balancer, request_rec *r,
52 proxy_server_conf *conf);
55 static int proxy_balancer_canon(request_rec *r, char *url)
62 /* TODO: offset of BALANCER_PREFIX ?? */
63 if (strncasecmp(url, "balancer:", 9) == 0) {
70 ap_log_error(APLOG_MARK, APLOG_TRACE1, 0, r->server,
71 "proxy: BALANCER: canonicalising URL %s", url);
74 * We break the URL into host, port, path, search
76 err = ap_proxy_canon_netloc(r->pool, &url, NULL, NULL, &host, &port);
78 ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
79 "error parsing URL %s: %s",
81 return HTTP_BAD_REQUEST;
84 * now parse path/search args, according to rfc1738:
85 * process the path. With proxy-noncanon set (by
86 * mod_proxy) we use the raw, unparsed uri
88 if (apr_table_get(r->notes, "proxy-nocanon")) {
89 path = url; /* this is the raw path */
92 path = ap_proxy_canonenc(r->pool, url, strlen(url), enc_path, 0,
97 return HTTP_BAD_REQUEST;
99 r->filename = apr_pstrcat(r->pool, "proxy:", BALANCER_PREFIX, host,
100 "/", path, (search) ? "?" : "", (search) ? search : "", NULL);
102 r->path_info = apr_pstrcat(r->pool, "/", path, NULL);
107 static void init_balancer_members(apr_pool_t *p, server_rec *s,
108 proxy_balancer *balancer)
111 proxy_worker **workers;
113 workers = (proxy_worker **)balancer->workers->elts;
115 for (i = 0; i < balancer->workers->nelts; i++) {
116 int worker_is_initialized;
117 proxy_worker *worker = *workers;
118 ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s,
119 "Looking at %s -> %s initialized?", balancer->name, worker->s->name);
120 worker_is_initialized = PROXY_WORKER_IS_INITIALIZED(worker);
121 if (!worker_is_initialized) {
122 ap_proxy_initialize_worker(worker, s, p);
127 /* Set default number of attempts to the number of
130 if (!balancer->s->max_attempts_set && balancer->workers->nelts > 1) {
131 balancer->s->max_attempts = balancer->workers->nelts - 1;
132 balancer->s->max_attempts_set = 1;
136 /* Retrieve the parameter with the given name
137 * Something like 'JSESSIONID=12345...N'
139 static char *get_path_param(apr_pool_t *pool, char *url,
140 const char *name, int scolon_sep)
143 char *pathdelims = "?&";
148 for (path = strstr(url, name); path; path = strstr(path + 1, name)) {
149 path += strlen(name);
152 * Session path was found, get its value
157 path = apr_strtok(apr_pstrdup(pool, path), pathdelims, &q);
165 static char *get_cookie_param(request_rec *r, const char *name)
168 const char *start_cookie;
170 if ((cookies = apr_table_get(r->headers_in, "Cookie"))) {
171 for (start_cookie = ap_strstr_c(cookies, name); start_cookie;
172 start_cookie = ap_strstr_c(start_cookie + 1, name)) {
173 if (start_cookie == cookies ||
174 start_cookie[-1] == ';' ||
175 start_cookie[-1] == ',' ||
176 isspace(start_cookie[-1])) {
178 start_cookie += strlen(name);
179 while(*start_cookie && isspace(*start_cookie))
181 if (*start_cookie++ == '=' && *start_cookie) {
183 * Session cookie was found, get its value
185 char *end_cookie, *cookie;
186 cookie = apr_pstrdup(r->pool, start_cookie);
187 if ((end_cookie = strchr(cookie, ';')) != NULL)
189 if((end_cookie = strchr(cookie, ',')) != NULL)
199 /* Find the worker that has the 'route' defined
201 static proxy_worker *find_route_worker(proxy_balancer *balancer,
202 const char *route, request_rec *r)
205 int checking_standby;
208 proxy_worker **workers;
210 checking_standby = checked_standby = 0;
211 while (!checked_standby) {
212 workers = (proxy_worker **)balancer->workers->elts;
213 for (i = 0; i < balancer->workers->nelts; i++, workers++) {
214 proxy_worker *worker = *workers;
215 if ( (checking_standby ? !PROXY_WORKER_IS_STANDBY(worker) : PROXY_WORKER_IS_STANDBY(worker)) )
217 if (*(worker->s->route) && strcmp(worker->s->route, route) == 0) {
218 if (worker && PROXY_WORKER_IS_USABLE(worker)) {
222 * If the worker is in error state run
223 * retry on that worker. It will be marked as
224 * operational if the retry timeout is elapsed.
225 * The worker might still be unusable, but we try
228 ap_proxy_retry_worker("BALANCER", worker, r->server);
229 if (PROXY_WORKER_IS_USABLE(worker)) {
233 * We have a worker that is unusable.
234 * It can be in error or disabled, but in case
235 * it has a redirection set use that redirection worker.
236 * This enables to safely remove the member from the
237 * balancer. Of course you will need some kind of
238 * session replication between those two remote.
240 if (*worker->s->redirect) {
241 proxy_worker *rworker = NULL;
242 rworker = find_route_worker(balancer, worker->s->redirect, r);
243 /* Check if the redirect worker is usable */
244 if (rworker && !PROXY_WORKER_IS_USABLE(rworker)) {
246 * If the worker is in error state run
247 * retry on that worker. It will be marked as
248 * operational if the retry timeout is elapsed.
249 * The worker might still be unusable, but we try
252 ap_proxy_retry_worker("BALANCER", rworker, r->server);
254 if (rworker && PROXY_WORKER_IS_USABLE(rworker))
261 checked_standby = checking_standby++;
266 static proxy_worker *find_session_route(proxy_balancer *balancer,
269 const char **sticky_used,
272 proxy_worker *worker = NULL;
274 if (!*balancer->s->sticky)
276 /* Try to find the sticky route inside url */
277 *route = get_path_param(r->pool, *url, balancer->s->sticky_path, balancer->s->scolonsep);
279 ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server,
280 "proxy: BALANCER: Found value %s for "
281 "stickysession %s", *route, balancer->s->sticky_path);
282 *sticky_used = balancer->s->sticky_path;
285 *route = get_cookie_param(r, balancer->s->sticky);
287 *sticky_used = balancer->s->sticky;
288 ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server,
289 "proxy: BALANCER: Found value %s for "
290 "stickysession %s", *route, balancer->s->sticky);
294 * If we found a value for sticksession, find the first '.' within.
295 * Everything after '.' (if present) is our route.
297 if ((*route) && ((*route = strchr(*route, '.')) != NULL ))
299 if ((*route) && (**route)) {
300 ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server,
301 "proxy: BALANCER: Found route %s", *route);
302 /* We have a route in path or in cookie
303 * Find the worker that has this route defined.
305 worker = find_route_worker(balancer, *route, r);
306 if (worker && strcmp(*route, worker->s->route)) {
308 * Notice that the route of the worker chosen is different from
309 * the route supplied by the client.
311 apr_table_setn(r->subprocess_env, "BALANCER_ROUTE_CHANGED", "1");
312 ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server,
313 "proxy: BALANCER: Route changed from %s to %s",
314 *route, worker->s->route);
322 static proxy_worker *find_best_worker(proxy_balancer *balancer,
325 proxy_worker *candidate = NULL;
328 if ((rv = PROXY_THREAD_LOCK(balancer)) != APR_SUCCESS) {
329 ap_log_error(APLOG_MARK, APLOG_ERR, rv, r->server,
330 "proxy: BALANCER: (%s). Lock failed for find_best_worker()", balancer->name);
334 candidate = (*balancer->lbmethod->finder)(balancer, r);
337 candidate->s->elected++;
339 if ((rv = PROXY_THREAD_UNLOCK(balancer)) != APR_SUCCESS) {
340 ap_log_error(APLOG_MARK, APLOG_ERR, rv, r->server,
341 "proxy: BALANCER: (%s). Unlock failed for find_best_worker()", balancer->name);
344 if (candidate == NULL) {
345 /* All the workers are in error state or disabled.
346 * If the balancer has a timeout sleep for a while
347 * and try again to find the worker. The chances are
348 * that some other thread will release a connection.
349 * By default the timeout is not set, and the server
350 * returns SERVER_BUSY.
352 if (balancer->s->timeout) {
353 /* XXX: This can perhaps be build using some
354 * smarter mechanism, like tread_cond.
355 * But since the statuses can came from
356 * different childs, use the provided algo.
358 apr_interval_time_t timeout = balancer->s->timeout;
359 apr_interval_time_t step, tval = 0;
360 /* Set the timeout to 0 so that we don't
361 * end in infinite loop
363 balancer->s->timeout = 0;
364 step = timeout / 100;
365 while (tval < timeout) {
368 if ((candidate = find_best_worker(balancer, r)))
372 /* restore the timeout */
373 balancer->s->timeout = timeout;
381 static int rewrite_url(request_rec *r, proxy_worker *worker,
384 const char *scheme = strstr(*url, "://");
385 const char *path = NULL;
388 path = ap_strchr_c(scheme + 3, '/');
390 /* we break the URL into host, port, uri */
392 return ap_proxyerror(r, HTTP_BAD_REQUEST, apr_pstrcat(r->pool,
393 "missing worker. URI cannot be parsed: ", *url,
397 *url = apr_pstrcat(r->pool, worker->s->name, path, NULL);
402 static void force_recovery(proxy_balancer *balancer, server_rec *s)
406 proxy_worker **worker;
408 worker = (proxy_worker **)balancer->workers->elts;
409 for (i = 0; i < balancer->workers->nelts; i++, worker++) {
410 if (!((*worker)->s->status & PROXY_WORKER_IN_ERROR)) {
415 /* Try if we can recover */
416 ap_proxy_retry_worker("BALANCER", *worker, s);
417 if (!((*worker)->s->status & PROXY_WORKER_IN_ERROR)) {
424 /* If all workers are in error state force the recovery.
426 worker = (proxy_worker **)balancer->workers->elts;
427 for (i = 0; i < balancer->workers->nelts; i++, worker++) {
428 ++(*worker)->s->retries;
429 (*worker)->s->status &= ~PROXY_WORKER_IN_ERROR;
430 ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s,
431 "proxy: BALANCER: (%s). Forcing recovery for worker (%s)",
432 balancer->name, (*worker)->s->hostname);
437 static int proxy_balancer_pre_request(proxy_worker **worker,
438 proxy_balancer **balancer,
440 proxy_server_conf *conf, char **url)
443 proxy_worker *runtime;
445 const char *sticky = NULL;
449 /* Step 1: check if the url is for us
450 * The url we can handle starts with 'balancer://'
451 * If balancer is already provided skip the search
452 * for balancer, because this is failover attempt.
455 !(*balancer = ap_proxy_get_balancer(r->pool, conf, *url)))
458 /* Step 2: Lock the LoadBalancer
459 * XXX: perhaps we need the process lock here
461 if ((rv = PROXY_THREAD_LOCK(*balancer)) != APR_SUCCESS) {
462 ap_log_error(APLOG_MARK, APLOG_ERR, rv, r->server,
463 "proxy: BALANCER: (%s). Lock failed for pre_request",
468 /* Step 3: force recovery */
469 force_recovery(*balancer, r->server);
471 /* Step 3.5: Update member list for the balancer */
472 /* TODO: Implement as provider! */
473 ap_proxy_sync_balancer(*balancer, r->server, conf);
475 /* Step 4: find the session route */
476 runtime = find_session_route(*balancer, r, &route, &sticky, url);
478 if ((*balancer)->lbmethod && (*balancer)->lbmethod->updatelbstatus) {
479 /* Call the LB implementation */
480 (*balancer)->lbmethod->updatelbstatus(*balancer, runtime, r->server);
482 else { /* Use the default one */
483 int i, total_factor = 0;
484 proxy_worker **workers;
485 /* We have a sticky load balancer
486 * Update the workers status
487 * so that even session routes get
490 workers = (proxy_worker **)(*balancer)->workers->elts;
491 for (i = 0; i < (*balancer)->workers->nelts; i++) {
492 /* Take into calculation only the workers that are
493 * not in error state or not disabled.
495 if (PROXY_WORKER_IS_USABLE(*workers)) {
496 (*workers)->s->lbstatus += (*workers)->s->lbfactor;
497 total_factor += (*workers)->s->lbfactor;
501 runtime->s->lbstatus -= total_factor;
503 runtime->s->elected++;
507 else if (route && (*balancer)->s->sticky_force) {
508 int i, member_of = 0;
509 proxy_worker **workers;
511 * We have a route provided that doesn't match the
512 * balancer name. See if the provider route is the
513 * member of the same balancer in which case return 503
515 workers = (proxy_worker **)(*balancer)->workers->elts;
516 for (i = 0; i < (*balancer)->workers->nelts; i++) {
517 if (*((*workers)->s->route) && strcmp((*workers)->s->route, route) == 0) {
524 ap_log_error(APLOG_MARK, APLOG_ERR, 0, r->server,
525 "proxy: BALANCER: (%s). All workers are in error state for route (%s)",
526 (*balancer)->name, route);
527 if ((rv = PROXY_THREAD_UNLOCK(*balancer)) != APR_SUCCESS) {
528 ap_log_error(APLOG_MARK, APLOG_ERR, rv, r->server,
529 "proxy: BALANCER: (%s). Unlock failed for pre_request",
532 return HTTP_SERVICE_UNAVAILABLE;
536 if ((rv = PROXY_THREAD_UNLOCK(*balancer)) != APR_SUCCESS) {
537 ap_log_error(APLOG_MARK, APLOG_ERR, rv, r->server,
538 "proxy: BALANCER: (%s). Unlock failed for pre_request",
542 runtime = find_best_worker(*balancer, r);
544 if ((*balancer)->workers->nelts) {
545 ap_log_error(APLOG_MARK, APLOG_ERR, 0, r->server,
546 "proxy: BALANCER: (%s). All workers are in error state",
549 ap_log_error(APLOG_MARK, APLOG_ERR, 0, r->server,
550 "proxy: BALANCER: (%s). No workers in balancer",
554 return HTTP_SERVICE_UNAVAILABLE;
556 if (*(*balancer)->s->sticky && runtime) {
558 * This balancer has sticky sessions and the client either has not
559 * supplied any routing information or all workers for this route
560 * including possible redirect and hotstandby workers are in error
561 * state, but we have found another working worker for this
562 * balancer where we can send the request. Thus notice that we have
563 * changed the route to the backend.
565 apr_table_setn(r->subprocess_env, "BALANCER_ROUTE_CHANGED", "1");
570 (*worker)->s->busy++;
572 /* Add balancer/worker info to env. */
573 apr_table_setn(r->subprocess_env,
574 "BALANCER_NAME", (*balancer)->name);
575 apr_table_setn(r->subprocess_env,
576 "BALANCER_WORKER_NAME", (*worker)->s->name);
577 apr_table_setn(r->subprocess_env,
578 "BALANCER_WORKER_ROUTE", (*worker)->s->route);
580 /* Rewrite the url from 'balancer://url'
581 * to the 'worker_scheme://worker_hostname[:worker_port]/url'
582 * This replaces the balancers fictional name with the
583 * real hostname of the elected worker.
585 access_status = rewrite_url(r, *worker, url);
586 /* Add the session route to request notes if present */
588 apr_table_setn(r->notes, "session-sticky", sticky);
589 apr_table_setn(r->notes, "session-route", route);
591 /* Add session info to env. */
592 apr_table_setn(r->subprocess_env,
593 "BALANCER_SESSION_STICKY", sticky);
594 apr_table_setn(r->subprocess_env,
595 "BALANCER_SESSION_ROUTE", route);
597 ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server,
598 "proxy: BALANCER (%s) worker (%s) rewritten to %s",
599 (*balancer)->name, (*worker)->s->name, *url);
601 return access_status;
604 static int proxy_balancer_post_request(proxy_worker *worker,
605 proxy_balancer *balancer,
607 proxy_server_conf *conf)
612 if ((rv = PROXY_THREAD_LOCK(balancer)) != APR_SUCCESS) {
613 ap_log_error(APLOG_MARK, APLOG_ERR, rv, r->server,
614 "proxy: BALANCER: (%s). Lock failed for post_request",
616 return HTTP_INTERNAL_SERVER_ERROR;
619 if (!apr_is_empty_array(balancer->errstatuses)) {
621 for (i = 0; i < balancer->errstatuses->nelts; i++) {
622 int val = ((int *)balancer->errstatuses->elts)[i];
623 if (r->status == val) {
624 ap_log_error(APLOG_MARK, APLOG_ERR, rv, r->server,
625 "proxy: BALANCER: (%s). Forcing recovery for worker (%s), failonstatus %d",
626 balancer->name, worker->s->name, val);
627 worker->s->status |= PROXY_WORKER_IN_ERROR;
628 worker->s->error_time = apr_time_now();
634 if ((rv = PROXY_THREAD_UNLOCK(balancer)) != APR_SUCCESS) {
635 ap_log_error(APLOG_MARK, APLOG_ERR, rv, r->server,
636 "proxy: BALANCER: (%s). Unlock failed for post_request",
639 ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server,
640 "proxy_balancer_post_request for (%s)", balancer->name);
642 if (worker && worker->s->busy)
649 static void recalc_factors(proxy_balancer *balancer)
652 proxy_worker **workers;
655 /* Recalculate lbfactors */
656 workers = (proxy_worker **)balancer->workers->elts;
657 /* Special case if there is only one worker its
658 * load factor will always be 1
660 if (balancer->workers->nelts == 1) {
661 (*workers)->s->lbstatus = (*workers)->s->lbfactor = 1;
664 for (i = 0; i < balancer->workers->nelts; i++) {
665 /* Update the status entries */
666 workers[i]->s->lbstatus = workers[i]->s->lbfactor;
670 static apr_status_t lock_remove(void *data)
673 proxy_balancer *balancer;
674 server_rec *s = data;
675 void *sconf = s->module_config;
676 proxy_server_conf *conf = (proxy_server_conf *) ap_get_module_config(sconf, &proxy_module);
678 balancer = (proxy_balancer *)conf->balancers->elts;
679 for (i = 0; i < conf->balancers->nelts; i++, balancer++) {
680 if (balancer->gmutex) {
681 apr_global_mutex_destroy(balancer->gmutex);
682 balancer->gmutex = NULL;
688 /* post_config hook: */
689 static int balancer_post_config(apr_pool_t *pconf, apr_pool_t *plog,
690 apr_pool_t *ptemp, server_rec *s)
693 void *sconf = s->module_config;
694 proxy_server_conf *conf = (proxy_server_conf *) ap_get_module_config(sconf, &proxy_module);
695 ap_slotmem_instance_t *new = NULL;
698 /* balancer_post_config() will be called twice during startup. So, don't
699 * set up the static data the 1st time through. */
700 if (ap_state_query(AP_SQ_MAIN_STATE) == AP_SQ_MS_CREATE_PRE_CONFIG)
706 storage = ap_lookup_provider(AP_SLOTMEM_PROVIDER_GROUP, "shared", "0");
708 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_EMERG, 0, s,
709 "ap_lookup_provider %s failed: is mod_slotmem_shm loaded??",
710 AP_SLOTMEM_PROVIDER_GROUP);
714 tstamp = apr_time_now();
716 * Go thru each Vhost and create the shared mem slotmem for
717 * each balancer's workers
721 proxy_balancer *balancer;
722 sconf = s->module_config;
723 conf = (proxy_server_conf *)ap_get_module_config(sconf, &proxy_module);
725 if (conf->balancers->nelts) {
726 conf->max_balancers = conf->balancers->nelts + conf->bgrowth;
727 ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, "Doing balancers create: %d, %d (%d)",
728 (int)ALIGNED_PROXY_BALANCER_SHARED_SIZE,
729 (int)conf->balancers->nelts, conf->max_balancers);
731 rv = storage->create(&new, conf->id,
732 ALIGNED_PROXY_BALANCER_SHARED_SIZE,
733 conf->max_balancers, AP_SLOTMEM_TYPE_PREGRAB, pconf);
734 if (rv != APR_SUCCESS) {
735 ap_log_error(APLOG_MARK, APLOG_EMERG, rv, s, "balancer slotmem_create failed");
740 conf->storage = storage;
742 /* Initialize shared scoreboard data */
743 balancer = (proxy_balancer *)conf->balancers->elts;
744 for (i = 0; i < conf->balancers->nelts; i++, balancer++) {
745 proxy_worker **workers;
746 proxy_worker *worker;
747 proxy_balancer_shared *bshm;
750 balancer->max_workers = balancer->workers->nelts + balancer->growth;
751 /* no need for the 'balancer://' prefix */
752 ap_pstr2_alnum(pconf, balancer->name + sizeof(BALANCER_PREFIX) - 1,
754 balancer->sname = apr_pstrcat(pconf, conf->id, "_", balancer->sname, NULL);
756 /* Create global mutex */
757 rv = ap_global_mutex_create(&(balancer->gmutex), NULL, balancer_mutex_type,
758 balancer->sname, s, pconf, 0);
759 if (rv != APR_SUCCESS || !balancer->gmutex) {
760 ap_log_error(APLOG_MARK, APLOG_EMERG, rv, s,
761 "mutex creation of %s : %s failed", balancer_mutex_type,
763 return HTTP_INTERNAL_SERVER_ERROR;
766 apr_pool_cleanup_register(pconf, (void *)s, lock_remove,
767 apr_pool_cleanup_null);
769 /* setup shm for balancers */
770 if ((rv = storage->grab(conf->slot, &index)) != APR_SUCCESS) {
771 ap_log_error(APLOG_MARK, APLOG_EMERG, rv, s, "balancer slotmem_grab failed");
775 if ((rv = storage->dptr(conf->slot, index, (void *)&bshm)) != APR_SUCCESS) {
776 ap_log_error(APLOG_MARK, APLOG_EMERG, rv, s, "balancer slotmem_dptr failed");
779 if ((rv = ap_proxy_share_balancer(balancer, bshm, index)) != APR_SUCCESS) {
780 ap_log_error(APLOG_MARK, APLOG_EMERG, rv, s, "Cannot share balancer");
784 /* create slotmem slots for workers */
785 ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, "Doing workers create: %s (%s), %d, %d",
786 balancer->name, balancer->sname,
787 (int)ALIGNED_PROXY_WORKER_SHARED_SIZE,
788 (int)balancer->max_workers);
790 rv = storage->create(&new, balancer->sname,
791 ALIGNED_PROXY_WORKER_SHARED_SIZE,
792 balancer->max_workers, AP_SLOTMEM_TYPE_PREGRAB, pconf);
793 if (rv != APR_SUCCESS) {
794 ap_log_error(APLOG_MARK, APLOG_EMERG, rv, s, "worker slotmem_create failed");
797 balancer->slot = new;
798 balancer->storage = storage;
800 /* sync all timestamps */
801 balancer->wupdated = balancer->s->wupdated = tstamp;
803 /* now go thru each worker */
804 workers = (proxy_worker **)balancer->workers->elts;
805 for (j = 0; j < balancer->workers->nelts; j++, workers++) {
806 proxy_worker_shared *shm;
809 if ((rv = storage->grab(balancer->slot, &index)) != APR_SUCCESS) {
810 ap_log_error(APLOG_MARK, APLOG_EMERG, rv, s, "worker slotmem_grab failed");
814 if ((rv = storage->dptr(balancer->slot, index, (void *)&shm)) != APR_SUCCESS) {
815 ap_log_error(APLOG_MARK, APLOG_EMERG, rv, s, "worker slotmem_dptr failed");
818 if ((rv = ap_proxy_share_worker(worker, shm, index)) != APR_SUCCESS) {
819 ap_log_error(APLOG_MARK, APLOG_EMERG, rv, s, "Cannot share worker");
822 worker->s->updated = tstamp;
831 static void create_radio(const char *name, unsigned int flag, request_rec *r)
833 ap_rvputs(r, "<td>On <input name='", name, "' id='", name, "' value='1' type=radio", NULL);
835 ap_rputs(" checked", r);
836 ap_rvputs(r, "> <br/> Off <input name='", name, "' id='", name, "' value='0' type=radio", NULL);
838 ap_rputs(" checked", r);
839 ap_rputs("></td>\n", r);
842 static void push2table(const char *input, apr_table_t *params,
843 const char *allowed[], apr_pool_t *p)
852 args = apr_pstrdup(p, input);
854 key = apr_strtok(args, "&", &tok);
856 val = strchr(key, '=');
863 ap_unescape_url(key);
864 ap_unescape_url(val);
865 if (allowed == NULL) { /* allow all */
866 apr_table_set(params, key, val);
869 const char *ok = *allowed;
871 if (strcmp(ok, key) == 0) {
872 apr_table_set(params, key, val);
878 key = apr_strtok(NULL, "&", &tok);
882 /* Manages the loadfactors and member status
883 * The balancer, worker and nonce are obtained from
884 * the request args (?b=...&w=...&nonce=....).
885 * All other params are pulled from any POST
888 * /.../<whatever>/balancer/worker/nonce
890 static int balancer_handler(request_rec *r)
893 proxy_server_conf *conf;
894 proxy_balancer *balancer, *bsel = NULL;
895 proxy_worker *worker, *wsel = NULL;
896 proxy_worker **workers = NULL;
904 /* is this for us? */
905 if (strcmp(r->handler, "balancer-manager")) {
910 | (AP_METHOD_BIT << M_GET)
911 | (AP_METHOD_BIT << M_POST);
912 if ((r->method_number != M_GET) && (r->method_number != M_POST)) {
916 sconf = r->server->module_config;
917 conf = (proxy_server_conf *) ap_get_module_config(sconf, &proxy_module);
918 params = apr_table_make(r->pool, 10);
920 balancer = (proxy_balancer *)conf->balancers->elts;
921 for (i = 0; i < conf->balancers->nelts; i++, balancer++) {
922 if ((rv = PROXY_THREAD_LOCK(balancer)) != APR_SUCCESS) {
923 ap_log_error(APLOG_MARK, APLOG_ERR, rv, r->server,
924 "proxy: BALANCER: (%s). Lock failed for balancer_handler",
927 ap_proxy_sync_balancer(balancer, r->server, conf);
928 if ((rv = PROXY_THREAD_UNLOCK(balancer)) != APR_SUCCESS) {
929 ap_log_error(APLOG_MARK, APLOG_ERR, rv, r->server,
930 "proxy: BALANCER: (%s). Unlock failed for balancer_handler",
935 if (r->args && (r->method_number == M_GET)) {
936 const char *allowed[] = { "w", "b", "nonce", NULL };
937 ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server, "parsing r->args");
939 push2table(r->args, params, allowed, r->pool);
941 if (r->method_number == M_POST) {
942 apr_bucket_brigade *ib;
943 apr_size_t len = 1024;
944 char *buf = apr_pcalloc(r->pool, len+1);
946 ib = apr_brigade_create(r->connection->pool, r->connection->bucket_alloc);
947 rv = ap_get_brigade(r->input_filters, ib, AP_MODE_READBYTES,
948 APR_BLOCK_READ, len);
949 if (rv != APR_SUCCESS) {
950 return HTTP_INTERNAL_SERVER_ERROR;
952 apr_brigade_flatten(ib, buf, &len);
954 push2table(buf, params, NULL, r->pool);
956 if ((name = apr_table_get(params, "b")))
957 bsel = ap_proxy_get_balancer(r->pool, conf,
958 apr_pstrcat(r->pool, BALANCER_PREFIX, name, NULL));
960 if ((name = apr_table_get(params, "w"))) {
961 wsel = ap_proxy_get_worker(r->pool, bsel, conf, name);
965 /* Check that the supplied nonce matches this server's nonce;
966 * otherwise ignore all parameters, to prevent a CSRF attack. */
970 (name = apr_table_get(params, "nonce")) == NULL ||
971 strcmp(bsel->s->nonce, name) != 0
975 apr_table_clear(params);
979 /* First set the params */
980 if (wsel && ok2change) {
982 int was_usable = PROXY_WORKER_IS_USABLE(wsel);
984 ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server, "settings worker params");
986 if ((val = apr_table_get(params, "w_lf"))) {
987 int ival = atoi(val);
988 if (ival >= 1 && ival <= 100) {
989 wsel->s->lbfactor = ival;
991 recalc_factors(bsel);
994 if ((val = apr_table_get(params, "w_wr"))) {
995 if (strlen(val) && strlen(val) < sizeof(wsel->s->route))
996 strcpy(wsel->s->route, val);
998 *wsel->s->route = '\0';
1000 if ((val = apr_table_get(params, "w_rr"))) {
1001 if (strlen(val) && strlen(val) < sizeof(wsel->s->redirect))
1002 strcpy(wsel->s->redirect, val);
1004 *wsel->s->redirect = '\0';
1006 if ((val = apr_table_get(params, "w_status_I"))) {
1007 ap_proxy_set_wstatus('I', atoi(val), wsel);
1009 if ((val = apr_table_get(params, "w_status_N"))) {
1010 ap_proxy_set_wstatus('N', atoi(val), wsel);
1012 if ((val = apr_table_get(params, "w_status_D"))) {
1013 ap_proxy_set_wstatus('D', atoi(val), wsel);
1015 if ((val = apr_table_get(params, "w_status_H"))) {
1016 ap_proxy_set_wstatus('H', atoi(val), wsel);
1018 if ((val = apr_table_get(params, "w_ls"))) {
1019 int ival = atoi(val);
1020 if (ival >= 0 && ival <= 99) {
1021 wsel->s->lbset = ival;
1024 /* if enabling, we need to reset all lb params */
1025 if (bsel && !was_usable && PROXY_WORKER_IS_USABLE(wsel)) {
1026 bsel->s->need_reset = 1;
1031 if (bsel && ok2change) {
1034 ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server, "settings balancer params");
1035 if ((val = apr_table_get(params, "b_lbm"))) {
1036 if ((strlen(val) < (sizeof(bsel->s->lbpname)-1)) &&
1037 strcmp(val, bsel->s->lbpname)) {
1038 proxy_balancer_method *lbmethod;
1039 lbmethod = ap_lookup_provider(PROXY_LBMETHOD, val, "0");
1041 PROXY_STRNCPY(bsel->s->lbpname, val);
1042 bsel->lbmethod = lbmethod;
1043 bsel->s->wupdated = apr_time_now();
1044 bsel->s->need_reset = 1;
1048 if ((val = apr_table_get(params, "b_tmo"))) {
1050 if (ival >= 0 && ival <= 7200) { /* 2 hrs enuff? */
1051 bsel->s->timeout = apr_time_from_sec(ival);
1054 if ((val = apr_table_get(params, "b_max"))) {
1056 if (ival >= 0 && ival <= 99) {
1057 bsel->s->max_attempts = ival;
1060 if ((val = apr_table_get(params, "b_sforce"))) {
1062 bsel->s->sticky_force = (ival != 0);
1064 if ((val = apr_table_get(params, "b_ss")) && *val) {
1065 if (strlen(val) < (sizeof(bsel->s->sticky_path)-1)) {
1066 if (*val == '-' && *(val+1) == '\0')
1067 *bsel->s->sticky_path = *bsel->s->sticky = '\0';
1070 PROXY_STRNCPY(bsel->s->sticky_path, val);
1071 PROXY_STRNCPY(bsel->s->sticky, val);
1073 if ((path = strchr((char *)bsel->s->sticky, '|'))) {
1075 PROXY_STRNCPY(bsel->s->sticky_path, path);
1080 if ((val = apr_table_get(params, "b_wyes")) &&
1081 (*val == '1' && *(val+1) == '\0') &&
1082 (val = apr_table_get(params, "b_nwrkr"))) {
1084 proxy_worker *nworker;
1085 nworker = ap_proxy_get_worker(conf->pool, bsel, conf, val);
1086 if (!nworker && storage->num_free_slots(bsel->slot)) {
1087 if ((rv = PROXY_GLOBAL_LOCK(bsel)) != APR_SUCCESS) {
1088 ap_log_error(APLOG_MARK, APLOG_ERR, rv, r->server,
1089 "proxy: BALANCER: (%s). Lock failed for adding worker",
1092 ret = ap_proxy_define_worker(conf->pool, &nworker, bsel, conf, val, 0);
1095 proxy_worker_shared *shm;
1096 PROXY_COPY_CONF_PARAMS(nworker, conf);
1097 if ((rv = storage->grab(bsel->slot, &index)) != APR_SUCCESS) {
1098 ap_log_error(APLOG_MARK, APLOG_EMERG, rv, r->server, "worker slotmem_grab failed");
1099 if ((rv = PROXY_GLOBAL_UNLOCK(bsel)) != APR_SUCCESS) {
1100 ap_log_error(APLOG_MARK, APLOG_ERR, rv, r->server,
1101 "proxy: BALANCER: (%s). Unlock failed for adding worker",
1104 return HTTP_BAD_REQUEST;
1106 if ((rv = storage->dptr(bsel->slot, index, (void *)&shm)) != APR_SUCCESS) {
1107 ap_log_error(APLOG_MARK, APLOG_EMERG, rv, r->server, "worker slotmem_dptr failed");
1108 if ((rv = PROXY_GLOBAL_UNLOCK(bsel)) != APR_SUCCESS) {
1109 ap_log_error(APLOG_MARK, APLOG_ERR, rv, r->server,
1110 "proxy: BALANCER: (%s). Unlock failed for adding worker",
1113 return HTTP_BAD_REQUEST;
1115 if ((rv = ap_proxy_share_worker(nworker, shm, index)) != APR_SUCCESS) {
1116 ap_log_error(APLOG_MARK, APLOG_EMERG, rv, r->server, "Cannot share worker");
1117 if ((rv = PROXY_GLOBAL_UNLOCK(bsel)) != APR_SUCCESS) {
1118 ap_log_error(APLOG_MARK, APLOG_ERR, rv, r->server,
1119 "proxy: BALANCER: (%s). Unlock failed for adding worker",
1122 return HTTP_BAD_REQUEST;
1124 if ((rv = ap_proxy_initialize_worker(nworker, r->server, conf->pool)) != APR_SUCCESS) {
1125 ap_log_error(APLOG_MARK, APLOG_EMERG, rv, r->server, "Cannot init worker");
1126 if ((rv = PROXY_GLOBAL_UNLOCK(bsel)) != APR_SUCCESS) {
1127 ap_log_error(APLOG_MARK, APLOG_ERR, rv, r->server,
1128 "proxy: BALANCER: (%s). Unlock failed for adding worker",
1131 return HTTP_BAD_REQUEST;
1133 /* sync all timestamps */
1134 bsel->wupdated = bsel->s->wupdated = nworker->s->updated = apr_time_now();
1135 /* by default, all new workers are disabled */
1136 ap_proxy_set_wstatus('D', 1, nworker);
1138 if ((rv = PROXY_GLOBAL_UNLOCK(bsel)) != APR_SUCCESS) {
1139 ap_log_error(APLOG_MARK, APLOG_ERR, rv, r->server,
1140 "proxy: BALANCER: (%s). Unlock failed for adding worker",
1149 action = ap_construct_url(r->pool, r->uri, r);
1150 ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server, "genning page");
1152 if (apr_table_get(params, "xml")) {
1153 ap_set_content_type(r, "text/xml");
1154 ap_rputs("<?xml version='1.0' encoding='UTF-8' ?>\n", r);
1155 ap_rputs("<httpd:manager xmlns:httpd='http://httpd.apache.org'>\n", r);
1156 ap_rputs(" <httpd:balancers>\n", r);
1157 balancer = (proxy_balancer *)conf->balancers->elts;
1158 for (i = 0; i < conf->balancers->nelts; i++) {
1159 ap_rputs(" <httpd:balancer>\n", r);
1160 ap_rvputs(r, " <httpd:name>", balancer->name, "</httpd:name>\n", NULL);
1161 ap_rputs(" <httpd:workers>\n", r);
1162 workers = (proxy_worker **)balancer->workers->elts;
1163 for (n = 0; n < balancer->workers->nelts; n++) {
1165 ap_rputs(" <httpd:worker>\n", r);
1166 ap_rvputs(r, " <httpd:scheme>", worker->s->scheme,
1167 "</httpd:scheme>\n", NULL);
1168 ap_rvputs(r, " <httpd:hostname>", worker->s->hostname,
1169 "</httpd:hostname>\n", NULL);
1170 ap_rprintf(r, " <httpd:loadfactor>%d</httpd:loadfactor>\n",
1171 worker->s->lbfactor);
1172 ap_rputs(" </httpd:worker>\n", r);
1175 ap_rputs(" </httpd:workers>\n", r);
1176 ap_rputs(" </httpd:balancer>\n", r);
1179 ap_rputs(" </httpd:balancers>\n", r);
1180 ap_rputs("</httpd:manager>", r);
1183 ap_set_content_type(r, "text/html; charset=ISO-8859-1");
1184 ap_rputs(DOCTYPE_HTML_3_2
1185 "<html><head><title>Balancer Manager</title></head>\n", r);
1186 ap_rputs("<body><h1>Load Balancer Manager for ", r);
1187 ap_rvputs(r, ap_get_server_name(r), "</h1>\n\n", NULL);
1188 ap_rvputs(r, "<dl><dt>Server Version: ",
1189 ap_get_server_description(), "</dt>\n", NULL);
1190 ap_rvputs(r, "<dt>Server Built: ",
1191 ap_get_server_built(), "\n</dt></dl>\n", NULL);
1192 balancer = (proxy_balancer *)conf->balancers->elts;
1193 for (i = 0; i < conf->balancers->nelts; i++) {
1195 ap_rputs("<hr />\n<h3>LoadBalancer Status for ", r);
1196 ap_rvputs(r, "<a href='", r->uri, "?b=",
1197 balancer->name + sizeof(BALANCER_PREFIX) - 1,
1198 "&nonce=", balancer->s->nonce,
1200 ap_rvputs(r, balancer->name, "</a></h3>\n\n", NULL);
1201 ap_rputs("\n\n<table border='0' style='text-align: left;'><tr>"
1202 "<th>MaxMembers</th><th>StickySession</th><th>DisableFailover</th><th>Timeout</th><th>FailoverAttempts</th><th>Method</th>"
1204 /* the below is a safe cast, since the number of slots total will
1205 * never be more than max_workers, which is restricted to int */
1206 ap_rprintf(r, "<td align='center'>%d [%d Used]</td>\n", balancer->max_workers,
1207 balancer->max_workers - (int)storage->num_free_slots(balancer->slot));
1208 if (*balancer->s->sticky) {
1209 if (strcmp(balancer->s->sticky, balancer->s->sticky_path)) {
1210 ap_rvputs(r, "<td align='center'>", balancer->s->sticky, " | ",
1211 balancer->s->sticky_path, NULL);
1214 ap_rvputs(r, "<td align='center'>", balancer->s->sticky, NULL);
1218 ap_rputs("<td align='center'> (None) ", r);
1220 ap_rprintf(r, "<td align='center'>%s</td>\n",
1221 balancer->s->sticky_force ? "On" : "Off");
1222 ap_rprintf(r, "</td><td align='center'>%" APR_TIME_T_FMT "</td>",
1223 apr_time_sec(balancer->s->timeout));
1224 ap_rprintf(r, "<td align='center'>%d</td>\n", balancer->s->max_attempts);
1225 ap_rprintf(r, "<td align='center'>%s</td>\n",
1226 balancer->s->lbpname);
1227 ap_rputs("</table>\n<br />", r);
1228 ap_rputs("\n\n<table border='0' style='text-align: left;'><tr>"
1229 "<th>Worker URL</th>"
1230 "<th>Route</th><th>RouteRedir</th>"
1231 "<th>Factor</th><th>Set</th><th align='center'>Status</th>"
1232 "<th>Elected</th><th>Busy</th><th>Load</th><th>To</th><th>From</th>"
1235 workers = (proxy_worker **)balancer->workers->elts;
1236 for (n = 0; n < balancer->workers->nelts; n++) {
1239 ap_rvputs(r, "<tr>\n<td><a href='", r->uri, "?b=",
1240 balancer->name + sizeof(BALANCER_PREFIX) - 1, "&w=",
1241 ap_escape_uri(r->pool, worker->s->name),
1242 "&nonce=", balancer->s->nonce,
1244 ap_rvputs(r, worker->s->name, "</a></td>", NULL);
1245 ap_rvputs(r, "<td align='center'>", ap_escape_html(r->pool, worker->s->route),
1247 ap_rvputs(r, "</td><td align='center'>",
1248 ap_escape_html(r->pool, worker->s->redirect), NULL);
1249 ap_rprintf(r, "</td><td align='center'>%d</td>", worker->s->lbfactor);
1250 ap_rprintf(r, "<td align='center'>%d</td><td align='center'>", worker->s->lbset);
1251 ap_rvputs(r, ap_proxy_parse_wstatus(r->pool, worker), NULL);
1252 ap_rputs("</td>", r);
1253 ap_rprintf(r, "<td align='center'>%" APR_SIZE_T_FMT "</td>", worker->s->elected);
1254 ap_rprintf(r, "<td align='center'>%" APR_SIZE_T_FMT "</td>", worker->s->busy);
1255 ap_rprintf(r, "<td align='center'>%d</td><td align='center'>", worker->s->lbstatus);
1256 ap_rputs(apr_strfsize(worker->s->transferred, fbuf), r);
1257 ap_rputs("</td><td align='center'>", r);
1258 ap_rputs(apr_strfsize(worker->s->read, fbuf), r);
1259 ap_rputs("</td></tr>\n", r);
1263 ap_rputs("</table>\n", r);
1266 ap_rputs("<hr />\n", r);
1268 ap_rputs("<h3>Edit worker settings for ", r);
1269 ap_rvputs(r, wsel->s->name, "</h3>\n", NULL);
1270 ap_rputs("<form method='POST' enctype='application/x-www-form-urlencoded' action='", r);
1271 ap_rvputs(r, action, "'>\n", NULL);
1272 ap_rputs("<dl>\n<table><tr><td>Load factor:</td><td><input name='w_lf' id='w_lf' type=text ", r);
1273 ap_rprintf(r, "value='%d'></td></tr>\n", wsel->s->lbfactor);
1274 ap_rputs("<tr><td>LB Set:</td><td><input name='w_ls' id='w_ls' type=text ", r);
1275 ap_rprintf(r, "value='%d'></td></tr>\n", wsel->s->lbset);
1276 ap_rputs("<tr><td>Route:</td><td><input name='w_wr' id='w_wr' type=text ", r);
1277 ap_rvputs(r, "value='", ap_escape_html(r->pool, wsel->s->route),
1279 ap_rputs("'></td></tr>\n", r);
1280 ap_rputs("<tr><td>Route Redirect:</td><td><input name='w_rr' id='w_rr' type=text ", r);
1281 ap_rvputs(r, "value='", ap_escape_html(r->pool, wsel->s->redirect),
1283 ap_rputs("'></td></tr>\n", r);
1284 ap_rputs("<tr><td>Status:</td>", r);
1285 ap_rputs("<td><table border='1'><tr><th>Ign</th><th>Drn</th><th>Dis</th><th>Stby</th></tr>\n<tr>", r);
1286 create_radio("w_status_I", (PROXY_WORKER_IGNORE_ERRORS & wsel->s->status), r);
1287 create_radio("w_status_N", (PROXY_WORKER_DRAIN & wsel->s->status), r);
1288 create_radio("w_status_D", (PROXY_WORKER_DISABLED & wsel->s->status), r);
1289 create_radio("w_status_H", (PROXY_WORKER_HOT_STANDBY & wsel->s->status), r);
1290 ap_rputs("</tr></table>\n", r);
1291 ap_rputs("<tr><td colspan=2><input type=submit value='Submit'></td></tr>\n", r);
1292 ap_rvputs(r, "</table>\n<input type=hidden name='w' id='w' ", NULL);
1293 ap_rvputs(r, "value='", ap_escape_uri(r->pool, wsel->s->name), "'>\n", NULL);
1294 ap_rvputs(r, "<input type=hidden name='b' id='b' ", NULL);
1295 ap_rvputs(r, "value='", bsel->name + sizeof(BALANCER_PREFIX) - 1,
1297 ap_rvputs(r, "<input type=hidden name='nonce' id='nonce' value='",
1298 bsel->s->nonce, "'>\n", NULL);
1299 ap_rvputs(r, "</form>\n", NULL);
1300 ap_rputs("<hr />\n", r);
1302 const apr_array_header_t *provs;
1303 const ap_list_provider_names_t *pname;
1305 ap_rputs("<h3>Edit balancer settings for ", r);
1306 ap_rvputs(r, bsel->name, "</h3>\n", NULL);
1307 ap_rputs("<form method='POST' enctype='application/x-www-form-urlencoded' action='", r);
1308 ap_rvputs(r, action, "'>\n", NULL);
1309 ap_rputs("<dl>\n<table>\n", r);
1310 provs = ap_list_provider_names(r->pool, PROXY_LBMETHOD, "0");
1312 ap_rputs("<tr><td>LBmethod:</td>", r);
1313 ap_rputs("<td>\n<select name='b_lbm' id='b_lbm'>", r);
1314 pname = (ap_list_provider_names_t *)provs->elts;
1315 for (i = 0; i < provs->nelts; i++, pname++) {
1316 ap_rvputs(r,"<option value='", pname->provider_name, "'", NULL);
1317 if (strcmp(pname->provider_name, bsel->s->lbpname) == 0)
1318 ap_rputs(" selected ", r);
1319 ap_rvputs(r, ">", pname->provider_name, "\n", NULL);
1321 ap_rputs("</select>\n</td></tr>\n", r);
1323 ap_rputs("<tr><td>Timeout:</td><td><input name='b_tmo' id='b_tmo' type=text ", r);
1324 ap_rprintf(r, "value='%" APR_TIME_T_FMT "'></td></tr>\n", apr_time_sec(bsel->s->timeout));
1325 ap_rputs("<tr><td>Failover Attempts:</td><td><input name='b_max' id='b_max' type=text ", r);
1326 ap_rprintf(r, "value='%d'></td></tr>\n", bsel->s->max_attempts);
1327 ap_rputs("<tr><td>Disable Failover:</td>", r);
1328 create_radio("b_sforce", bsel->s->sticky_force, r);
1329 ap_rputs("<tr><td>Sticky Session:</td><td><input name='b_ss' id='b_ss' size=64 type=text ", r);
1330 if (strcmp(bsel->s->sticky, bsel->s->sticky_path)) {
1331 ap_rvputs(r, "value ='", bsel->s->sticky, " | ",
1332 bsel->s->sticky_path, NULL);
1335 ap_rvputs(r, "value ='", bsel->s->sticky, NULL);
1337 ap_rputs("'> (Use '-' to delete)</td></tr>\n", r);
1338 if (storage->num_free_slots(bsel->slot) != 0) {
1339 ap_rputs("<tr><td>Add New Worker:</td><td><input name='b_nwrkr' id='b_nwrkr' size=32 type=text>"
1340 " Are you sure? <input name='b_wyes' id='b_wyes' type=checkbox value='1'>"
1343 ap_rputs("<tr><td colspan=2><input type=submit value='Submit'></td></tr>\n", r);
1344 ap_rvputs(r, "</table>\n<input type=hidden name='b' id='b' ", NULL);
1345 ap_rvputs(r, "value='", bsel->name + sizeof(BALANCER_PREFIX) - 1,
1347 ap_rvputs(r, "<input type=hidden name='nonce' id='nonce' value='",
1348 bsel->s->nonce, "'>\n", NULL);
1349 ap_rvputs(r, "</form>\n", NULL);
1350 ap_rputs("<hr />\n", r);
1352 ap_rputs(ap_psignature("",r), r);
1353 ap_rputs("</body></html>\n", r);
1359 static void balancer_child_init(apr_pool_t *p, server_rec *s)
1362 proxy_balancer *balancer;
1364 void *sconf = s->module_config;
1365 proxy_server_conf *conf = (proxy_server_conf *)ap_get_module_config(sconf, &proxy_module);
1368 if (conf->balancers->nelts) {
1371 storage->attach(&(conf->slot), conf->id, &size, &num, p);
1373 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_EMERG, 0, s, "slotmem_attach failed");
1374 exit(1); /* Ugly, but what else? */
1378 balancer = (proxy_balancer *)conf->balancers->elts;
1379 for (i = 0; i < conf->balancers->nelts; i++, balancer++) {
1380 rv = ap_proxy_initialize_balancer(balancer, s, p);
1382 if (rv != APR_SUCCESS) {
1383 ap_log_error(APLOG_MARK, APLOG_CRIT, rv, s,
1384 "Failed to init balancer %s in child",
1386 exit(1); /* Ugly, but what else? */
1388 init_balancer_members(conf->pool, s, balancer);
1395 static void ap_proxy_balancer_register_hook(apr_pool_t *p)
1397 /* Only the mpm_winnt has child init hook handler.
1398 * make sure that we are called after the mpm
1401 static const char *const aszPred[] = { "mpm_winnt.c", "mod_slotmem_shm.c", NULL};
1402 /* manager handler */
1403 ap_hook_post_config(balancer_post_config, NULL, NULL, APR_HOOK_MIDDLE);
1404 ap_hook_pre_config(balancer_pre_config, NULL, NULL, APR_HOOK_MIDDLE);
1405 ap_hook_handler(balancer_handler, NULL, NULL, APR_HOOK_FIRST);
1406 ap_hook_child_init(balancer_child_init, aszPred, NULL, APR_HOOK_MIDDLE);
1407 proxy_hook_pre_request(proxy_balancer_pre_request, NULL, NULL, APR_HOOK_FIRST);
1408 proxy_hook_post_request(proxy_balancer_post_request, NULL, NULL, APR_HOOK_FIRST);
1409 proxy_hook_canon_handler(proxy_balancer_canon, NULL, NULL, APR_HOOK_FIRST);
1412 AP_DECLARE_MODULE(proxy_balancer) = {
1413 STANDARD20_MODULE_STUFF,
1414 NULL, /* create per-directory config structure */
1415 NULL, /* merge per-directory config structures */
1416 NULL, /* create per-server config structure */
1417 NULL, /* merge per-server config structures */
1418 NULL, /* command apr_table_t */
1419 ap_proxy_balancer_register_hook /* register hooks */