endpoint/stasis: Eliminate duplicate events on endpoint status change

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

1 files changed, 14 insertions, 6 deletions

diff --git a/main/endpoints.c b/main/endpoints.c
index 21326561c..b73edd379 100644
--- a/main/endpoints.c
+++ b/main/endpoints.c
@@ -303,13 +303,14 @@ static struct ast_endpoint *endpoint_internal_create(const char *tech, const cha
 		return NULL;
 	}
 
-	endpoint->topics = stasis_cp_single_create(ast_endpoint_cache_all(),
-		endpoint->id);
-	if (!endpoint->topics) {
-		return NULL;
-	}
-
 	if (!ast_strlen_zero(resource)) {
+
+		endpoint->topics = stasis_cp_single_create(ast_endpoint_cache_all(),
+			endpoint->id);
+		if (!endpoint->topics) {
+			return NULL;
+		}
+
 		endpoint->router = stasis_message_router_create_pool(ast_endpoint_topic(endpoint));
 		if (!endpoint->router) {
 			return NULL;
@@ -325,9 +326,16 @@ static struct ast_endpoint *endpoint_internal_create(const char *tech, const cha
 
 		endpoint->tech_forward = stasis_forward_all(stasis_cp_single_topic(endpoint->topics),
 			stasis_cp_single_topic(tech_endpoint->topics));
+
 		endpoint_publish_snapshot(endpoint);
 		ao2_link(endpoints, endpoint);
 	} else {
+		endpoint->topics = stasis_cp_sink_create(ast_endpoint_cache_all(),
+			endpoint->id);
+		if (!endpoint->topics) {
+			return NULL;
+		}
+
 		ao2_link(tech_endpoints, endpoint);
 	}