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endpoint/stasis: Eliminate duplicate events on endpoint status change

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When an endpoint is created, its messages are forwarded to both the tech
endpoint topic and the all endpoints topic. This is done so that various
parties interested in endpoint messages can subscribe to just the tech
endpoint and receive all messages associated with that particular technology,
as opposed to subscribing to the all endpoints topic. Unfortunately, when the
tech endpoint is created, it also forwards all of its messages to the all
topic. This results in duplicate messages whenever an endpoint publishes its
messages.

This patch resolves the duplicate message issue by creating a new function
for Stasis caching topics, stasis_cp_sink_create. In most respects, this acts
as a normal caching topic, save that it no longer forwards messages it receives
to the all endpoints topic. This allows it to act as an aggregation "sink",
while preserving the necessary caching behaviour.

ASTERISK-25137 #close
Reported-by: Vitezslav Novy

ASTERISK-25116 #close
Reported-by: George Joseph <george.joseph@fairview5.com>
Tested-by: George Joseph <george.joseph@fairview5.com>

Change-Id: Ie47784adfb973ab0063e59fc18f390d7dd26d17b
This commit is contained in:
George Joseph
2015-05-27 12:22:39 -06:00
committed by Matt Jordan
parent 5e99ba393e
commit 3a1c4885be
3 changed files with 86 additions and 21 deletions
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51
main/stasis_cache_pattern.c
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@@ -138,20 +138,11 @@ struct stasis_cp_single *stasis_cp_single_create(struct stasis_cp_all *all,
{
RAII_VAR(struct stasis_cp_single *, one, NULL, ao2_cleanup);
one = ao2_t_alloc(sizeof(*one), one_dtor, name);
one = stasis_cp_single_create_only(all, name);
if (!one) {
return NULL;
}
one->topic = stasis_topic_create(name);
if (!one->topic) {
return NULL;
}
one->topic_cached = stasis_caching_topic_create(one->topic, all->cache);
if (!one->topic_cached) {
return NULL;
}
one->forward_topic_to_all = stasis_forward_all(one->topic, all->topic);
if (!one->forward_topic_to_all) {
return NULL;
@@ -166,6 +157,46 @@ struct stasis_cp_single *stasis_cp_single_create(struct stasis_cp_all *all,
return one;
}
struct stasis_cp_single *stasis_cp_single_create_only(struct stasis_cp_all *all,
const char *name)
{
RAII_VAR(struct stasis_cp_single *, one, NULL, ao2_cleanup);
one = ao2_t_alloc(sizeof(*one), one_dtor, name);
if (!one) {
return NULL;
}
one->topic = stasis_topic_create(name);
if (!one->topic) {
return NULL;
}
one->topic_cached = stasis_caching_topic_create(one->topic, all->cache);
if (!one->topic_cached) {
return NULL;
}
ao2_ref(one, +1);
return one;
}
int stasis_cp_single_forward(struct stasis_cp_single *from, struct stasis_cp_single *to)
{
from->forward_topic_to_all = stasis_forward_all(from->topic, to->topic);
if (!from->forward_topic_to_all) {
return -1;;
}
from->forward_cached_to_all = stasis_forward_all(
stasis_caching_get_topic(from->topic_cached),
stasis_caching_get_topic(to->topic_cached));
if (!from->forward_cached_to_all) {
return -1;
}
return 0;
}
void stasis_cp_single_unsubscribe(struct stasis_cp_single *one)
{
if (!one) {