--- /dev/null
+/***
+ This file is part of catta.
+
+ catta is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as
+ published by the Free Software Foundation; either version 2.1 of the
+ License, or (at your option) any later version.
+
+ catta is distributed in the hope that it will be useful, but WITHOUT
+ ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
+ Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with catta; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+ USA.
+***/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdlib.h>
+
+#include <catta/timeval.h>
+#include <catta/malloc.h>
+
+#include "announce.h"
+#include <catta/log.h>
+#include "rr-util.h"
+
+#define CATTA_ANNOUNCEMENT_JITTER_MSEC 250
+#define CATTA_PROBE_JITTER_MSEC 250
+#define CATTA_PROBE_INTERVAL_MSEC 250
+
+static void remove_announcer(CattaServer *s, CattaAnnouncer *a) {
+ assert(s);
+ assert(a);
+
+ if (a->time_event)
+ catta_time_event_free(a->time_event);
+
+ CATTA_LLIST_REMOVE(CattaAnnouncer, by_interface, a->iface->announcers, a);
+ CATTA_LLIST_REMOVE(CattaAnnouncer, by_entry, a->entry->announcers, a);
+
+ catta_free(a);
+}
+
+static void elapse_announce(CattaTimeEvent *e, void *userdata);
+
+static void set_timeout(CattaAnnouncer *a, const struct timeval *tv) {
+ assert(a);
+
+ if (!tv) {
+ if (a->time_event) {
+ catta_time_event_free(a->time_event);
+ a->time_event = NULL;
+ }
+ } else {
+
+ if (a->time_event)
+ catta_time_event_update(a->time_event, tv);
+ else
+ a->time_event = catta_time_event_new(a->server->time_event_queue, tv, elapse_announce, a);
+ }
+}
+
+static void next_state(CattaAnnouncer *a);
+
+void catta_s_entry_group_check_probed(CattaSEntryGroup *g, int immediately) {
+ CattaEntry *e;
+ assert(g);
+ assert(!g->dead);
+
+ /* Check whether all group members have been probed */
+
+ if (g->state != CATTA_ENTRY_GROUP_REGISTERING || g->n_probing > 0)
+ return;
+
+ catta_s_entry_group_change_state(g, CATTA_ENTRY_GROUP_ESTABLISHED);
+
+ if (g->dead)
+ return;
+
+ for (e = g->entries; e; e = e->by_group_next) {
+ CattaAnnouncer *a;
+
+ for (a = e->announcers; a; a = a->by_entry_next) {
+
+ if (a->state != CATTA_WAITING)
+ continue;
+
+ a->state = CATTA_ANNOUNCING;
+
+ if (immediately) {
+ /* Shortcut */
+
+ a->n_iteration = 1;
+ next_state(a);
+ } else {
+ struct timeval tv;
+ a->n_iteration = 0;
+ catta_elapse_time(&tv, 0, CATTA_ANNOUNCEMENT_JITTER_MSEC);
+ set_timeout(a, &tv);
+ }
+ }
+ }
+}
+
+static void next_state(CattaAnnouncer *a) {
+ assert(a);
+
+ if (a->state == CATTA_WAITING) {
+
+ assert(a->entry->group);
+
+ catta_s_entry_group_check_probed(a->entry->group, 1);
+
+ } else if (a->state == CATTA_PROBING) {
+
+ if (a->n_iteration >= 4) {
+ /* Probing done */
+
+ if (a->entry->group) {
+ assert(a->entry->group->n_probing);
+ a->entry->group->n_probing--;
+ }
+
+ if (a->entry->group && a->entry->group->state == CATTA_ENTRY_GROUP_REGISTERING)
+ a->state = CATTA_WAITING;
+ else {
+ a->state = CATTA_ANNOUNCING;
+ a->n_iteration = 1;
+ }
+
+ set_timeout(a, NULL);
+ next_state(a);
+ } else {
+ struct timeval tv;
+
+ catta_interface_post_probe(a->iface, a->entry->record, 0);
+
+ catta_elapse_time(&tv, CATTA_PROBE_INTERVAL_MSEC, 0);
+ set_timeout(a, &tv);
+
+ a->n_iteration++;
+ }
+
+ } else if (a->state == CATTA_ANNOUNCING) {
+
+ if (a->entry->flags & CATTA_PUBLISH_UNIQUE)
+ /* Send the whole rrset at once */
+ catta_server_prepare_matching_responses(a->server, a->iface, a->entry->record->key, 0);
+ else
+ catta_server_prepare_response(a->server, a->iface, a->entry, 0, 0);
+
+ catta_server_generate_response(a->server, a->iface, NULL, NULL, 0, 0, 0);
+
+ if (++a->n_iteration >= 4) {
+ /* Announcing done */
+
+ a->state = CATTA_ESTABLISHED;
+
+ set_timeout(a, NULL);
+ } else {
+ struct timeval tv;
+ catta_elapse_time(&tv, a->sec_delay*1000, CATTA_ANNOUNCEMENT_JITTER_MSEC);
+
+ if (a->n_iteration < 10)
+ a->sec_delay *= 2;
+
+ set_timeout(a, &tv);
+ }
+ }
+}
+
+static void elapse_announce(CattaTimeEvent *e, void *userdata) {
+ assert(e);
+
+ next_state(userdata);
+}
+
+static CattaAnnouncer *get_announcer(CattaServer *s, CattaEntry *e, CattaInterface *i) {
+ CattaAnnouncer *a;
+
+ assert(s);
+ assert(e);
+ assert(i);
+
+ for (a = e->announcers; a; a = a->by_entry_next)
+ if (a->iface == i)
+ return a;
+
+ return NULL;
+}
+
+static void go_to_initial_state(CattaAnnouncer *a) {
+ CattaEntry *e;
+ struct timeval tv;
+
+ assert(a);
+ e = a->entry;
+
+ if ((e->flags & CATTA_PUBLISH_UNIQUE) && !(e->flags & CATTA_PUBLISH_NO_PROBE))
+ a->state = CATTA_PROBING;
+ else if (!(e->flags & CATTA_PUBLISH_NO_ANNOUNCE)) {
+
+ if (!e->group || e->group->state == CATTA_ENTRY_GROUP_ESTABLISHED)
+ a->state = CATTA_ANNOUNCING;
+ else
+ a->state = CATTA_WAITING;
+
+ } else
+ a->state = CATTA_ESTABLISHED;
+
+ a->n_iteration = 1;
+ a->sec_delay = 1;
+
+ if (a->state == CATTA_PROBING && e->group)
+ e->group->n_probing++;
+
+ if (a->state == CATTA_PROBING)
+ set_timeout(a, catta_elapse_time(&tv, 0, CATTA_PROBE_JITTER_MSEC));
+ else if (a->state == CATTA_ANNOUNCING)
+ set_timeout(a, catta_elapse_time(&tv, 0, CATTA_ANNOUNCEMENT_JITTER_MSEC));
+ else
+ set_timeout(a, NULL);
+}
+
+static void new_announcer(CattaServer *s, CattaInterface *i, CattaEntry *e) {
+ CattaAnnouncer *a;
+
+ assert(s);
+ assert(i);
+ assert(e);
+ assert(!e->dead);
+
+ if (!catta_interface_match(i, e->iface, e->protocol) || !i->announcing || !catta_entry_is_commited(e))
+ return;
+
+ /* We don't want duplicate announcers */
+ if (get_announcer(s, e, i))
+ return;
+
+ if ((!(a = catta_new(CattaAnnouncer, 1)))) {
+ catta_log_error(__FILE__": Out of memory.");
+ return;
+ }
+
+ a->server = s;
+ a->iface = i;
+ a->entry = e;
+ a->time_event = NULL;
+
+ CATTA_LLIST_PREPEND(CattaAnnouncer, by_interface, i->announcers, a);
+ CATTA_LLIST_PREPEND(CattaAnnouncer, by_entry, e->announcers, a);
+
+ go_to_initial_state(a);
+}
+
+void catta_announce_interface(CattaServer *s, CattaInterface *i) {
+ CattaEntry *e;
+
+ assert(s);
+ assert(i);
+
+ if (!i->announcing)
+ return;
+
+ for (e = s->entries; e; e = e->entries_next)
+ if (!e->dead)
+ new_announcer(s, i, e);
+}
+
+static void announce_walk_callback(CattaInterfaceMonitor *m, CattaInterface *i, void* userdata) {
+ CattaEntry *e = userdata;
+
+ assert(m);
+ assert(i);
+ assert(e);
+ assert(!e->dead);
+
+ new_announcer(m->server, i, e);
+}
+
+void catta_announce_entry(CattaServer *s, CattaEntry *e) {
+ assert(s);
+ assert(e);
+ assert(!e->dead);
+
+ catta_interface_monitor_walk(s->monitor, e->iface, e->protocol, announce_walk_callback, e);
+}
+
+void catta_announce_group(CattaServer *s, CattaSEntryGroup *g) {
+ CattaEntry *e;
+
+ assert(s);
+ assert(g);
+
+ for (e = g->entries; e; e = e->by_group_next)
+ if (!e->dead)
+ catta_announce_entry(s, e);
+}
+
+int catta_entry_is_registered(CattaServer *s, CattaEntry *e, CattaInterface *i) {
+ CattaAnnouncer *a;
+
+ assert(s);
+ assert(e);
+ assert(i);
+ assert(!e->dead);
+
+ if (!(a = get_announcer(s, e, i)))
+ return 0;
+
+ return
+ a->state == CATTA_ANNOUNCING ||
+ a->state == CATTA_ESTABLISHED ||
+ (a->state == CATTA_WAITING && !(e->flags & CATTA_PUBLISH_UNIQUE));
+}
+
+int catta_entry_is_probing(CattaServer *s, CattaEntry *e, CattaInterface *i) {
+ CattaAnnouncer *a;
+
+ assert(s);
+ assert(e);
+ assert(i);
+ assert(!e->dead);
+
+ if (!(a = get_announcer(s, e, i)))
+ return 0;
+
+ return
+ a->state == CATTA_PROBING ||
+ (a->state == CATTA_WAITING && (e->flags & CATTA_PUBLISH_UNIQUE));
+}
+
+void catta_entry_return_to_initial_state(CattaServer *s, CattaEntry *e, CattaInterface *i) {
+ CattaAnnouncer *a;
+
+ assert(s);
+ assert(e);
+ assert(i);
+
+ if (!(a = get_announcer(s, e, i)))
+ return;
+
+ if (a->state == CATTA_PROBING && a->entry->group)
+ a->entry->group->n_probing--;
+
+ go_to_initial_state(a);
+}
+
+static CattaRecord *make_goodbye_record(CattaRecord *r) {
+ CattaRecord *g;
+
+ assert(r);
+
+ if (!(g = catta_record_copy(r)))
+ return NULL; /* OOM */
+
+ assert(g->ref == 1);
+ g->ttl = 0;
+
+ return g;
+}
+
+static int is_duplicate_entry(CattaServer *s, CattaEntry *e) {
+ CattaEntry *i;
+
+ assert(s);
+ assert(e);
+
+ for (i = catta_hashmap_lookup(s->entries_by_key, e->record->key); i; i = i->by_key_next) {
+
+ if ((i == e) || (i->dead))
+ continue;
+
+ if (!catta_record_equal_no_ttl(i->record, e->record))
+ continue;
+
+ return 1;
+ }
+
+ return 0;
+}
+
+static void send_goodbye_callback(CattaInterfaceMonitor *m, CattaInterface *i, void* userdata) {
+ CattaEntry *e = userdata;
+ CattaRecord *g;
+
+ assert(m);
+ assert(i);
+ assert(e);
+ assert(!e->dead);
+
+ if (!catta_interface_match(i, e->iface, e->protocol))
+ return;
+
+ if (e->flags & CATTA_PUBLISH_NO_ANNOUNCE)
+ return;
+
+ if (!catta_entry_is_registered(m->server, e, i))
+ return;
+
+ if (is_duplicate_entry(m->server, e))
+ return;
+
+ if (!(g = make_goodbye_record(e->record)))
+ return; /* OOM */
+
+ catta_interface_post_response(i, g, e->flags & CATTA_PUBLISH_UNIQUE, NULL, 1);
+ catta_record_unref(g);
+}
+
+static void reannounce(CattaAnnouncer *a) {
+ CattaEntry *e;
+ struct timeval tv;
+
+ assert(a);
+ e = a->entry;
+
+ /* If the group this entry belongs to is not even commited, there's nothing to reannounce */
+ if (e->group && (e->group->state == CATTA_ENTRY_GROUP_UNCOMMITED || e->group->state == CATTA_ENTRY_GROUP_COLLISION))
+ return;
+
+ /* Because we might change state we decrease the probing counter first */
+ if (a->state == CATTA_PROBING && a->entry->group)
+ a->entry->group->n_probing--;
+
+ if (a->state == CATTA_PROBING ||
+ (a->state == CATTA_WAITING && (e->flags & CATTA_PUBLISH_UNIQUE) && !(e->flags & CATTA_PUBLISH_NO_PROBE)))
+
+ /* We were probing or waiting after probe, so we restart probing from the beginning here */
+
+ a->state = CATTA_PROBING;
+ else if (a->state == CATTA_WAITING)
+
+ /* We were waiting, but were not probing before, so we continue waiting */
+ a->state = CATTA_WAITING;
+
+ else if (e->flags & CATTA_PUBLISH_NO_ANNOUNCE)
+
+ /* No announcer needed */
+ a->state = CATTA_ESTABLISHED;
+
+ else {
+
+ /* Ok, let's restart announcing */
+ a->state = CATTA_ANNOUNCING;
+ }
+
+ /* Now let's increase the probing counter again */
+ if (a->state == CATTA_PROBING && e->group)
+ e->group->n_probing++;
+
+ a->n_iteration = 1;
+ a->sec_delay = 1;
+
+ if (a->state == CATTA_PROBING)
+ set_timeout(a, catta_elapse_time(&tv, 0, CATTA_PROBE_JITTER_MSEC));
+ else if (a->state == CATTA_ANNOUNCING)
+ set_timeout(a, catta_elapse_time(&tv, 0, CATTA_ANNOUNCEMENT_JITTER_MSEC));
+ else
+ set_timeout(a, NULL);
+}
+
+
+static void reannounce_walk_callback(CattaInterfaceMonitor *m, CattaInterface *i, void* userdata) {
+ CattaEntry *e = userdata;
+ CattaAnnouncer *a;
+
+ assert(m);
+ assert(i);
+ assert(e);
+ assert(!e->dead);
+
+ if (!(a = get_announcer(m->server, e, i)))
+ return;
+
+ reannounce(a);
+}
+
+void catta_reannounce_entry(CattaServer *s, CattaEntry *e) {
+
+ assert(s);
+ assert(e);
+ assert(!e->dead);
+
+ catta_interface_monitor_walk(s->monitor, e->iface, e->protocol, reannounce_walk_callback, e);
+}
+
+void catta_goodbye_interface(CattaServer *s, CattaInterface *i, int send_goodbye, int remove) {
+ assert(s);
+ assert(i);
+
+ if (send_goodbye)
+ if (i->announcing) {
+ CattaEntry *e;
+
+ for (e = s->entries; e; e = e->entries_next)
+ if (!e->dead)
+ send_goodbye_callback(s->monitor, i, e);
+ }
+
+ if (remove)
+ while (i->announcers)
+ remove_announcer(s, i->announcers);
+}
+
+void catta_goodbye_entry(CattaServer *s, CattaEntry *e, int send_goodbye, int remove) {
+ assert(s);
+ assert(e);
+
+ if (send_goodbye)
+ if (!e->dead)
+ catta_interface_monitor_walk(s->monitor, CATTA_IF_UNSPEC, CATTA_PROTO_UNSPEC, send_goodbye_callback, e);
+
+ if (remove)
+ while (e->announcers)
+ remove_announcer(s, e->announcers);
+}
+
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