Revert "endpoint/stasis: Eliminate duplicate events on endpoint status change"

This reverts commit 6fca75bb628dfff2ab112e80b0228cf3ac0b8a05.

Change-Id: Ifee026cc63e22c5ac5717c37867a9f036373ae5a

3 files changed, 20 insertions, 85 deletions

diff --git a/include/asterisk/stasis_cache_pattern.h b/include/asterisk/stasis_cache_pattern.h
index 27761351a..2ea643e19 100644
--- a/include/asterisk/stasis_cache_pattern.h
+++ b/include/asterisk/stasis_cache_pattern.h
@@ -109,8 +109,6 @@ struct stasis_cp_single;
 /*!
  * \brief Create the 'one' side of the cache pattern.
  *
- * Create the 'one' and forward to all's topic and topic_cached.
- *
  * Dispose of using stasis_cp_single_unsubscribe().
  *
  * \param all Corresponding all side.
@@ -121,32 +119,6 @@ struct stasis_cp_single *stasis_cp_single_create(struct stasis_cp_all *all,
 	const char *name);
 
 /*!
- * \brief Create the 'one' side of the cache pattern.
- *
- * Create the 'one' but do not automatically forward.
- *
- * Dispose of using stasis_cp_single_unsubscribe().
- *
- * \param all Corresponding all side.
- * \param name Base name for the topics.
- * \return One side instance
- */
-struct stasis_cp_single *stasis_cp_single_create_only(struct stasis_cp_all *all,
-	const char *name);
-
-/*!
- * \brief Set up a topic and topic cache forward.
- *
- * Forward 'from' to 'to'.
- *
- * \param from Source 'one' side instance.
- * \param to Destination 'one' side instance.
- * \retval 0 Success
- * \retval -1 Failure
- */
-int stasis_cp_single_forward(struct stasis_cp_single *from, struct stasis_cp_single *to);
-
-/*!
  * \brief Stops caching and forwarding messages.
  *
  * \param one One side of the cache pattern.
diff --git a/main/endpoints.c b/main/endpoints.c
index 979d43e43..df9d289c7 100644
--- a/main/endpoints.c
+++ b/main/endpoints.c
@@ -74,6 +74,8 @@ struct ast_endpoint {
 	struct stasis_message_router *router;
 	/*! ast_str_container of channels associated with this endpoint */
 	struct ao2_container *channel_ids;
+	/*! Forwarding subscription from an endpoint to its tech endpoint */
+	struct stasis_forward *tech_forward;
 };
 
 static int endpoint_hash(const void *obj, int flags)
@@ -301,14 +303,13 @@ static struct ast_endpoint *endpoint_internal_create(const char *tech, const cha
 		return NULL;
 	}
 
-	if (!ast_strlen_zero(resource)) {
-
-		endpoint->topics = stasis_cp_single_create_only(ast_endpoint_cache_all(),
-			endpoint->id);
-		if (!endpoint->topics) {
-			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->router = stasis_message_router_create_pool(ast_endpoint_topic(endpoint));
 		if (!endpoint->router) {
 			return NULL;
@@ -322,19 +323,11 @@ static struct ast_endpoint *endpoint_internal_create(const char *tech, const cha
 			return NULL;
 		}
 
-		if (stasis_cp_single_forward(endpoint->topics, tech_endpoint->topics)) {
-			return NULL;
-		}
-
+		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_single_create(ast_endpoint_cache_all(),
-			endpoint->id);
-		if (!endpoint->topics) {
-			return NULL;
-		}
-
 		ao2_link(tech_endpoints, endpoint);
 	}
 
@@ -382,6 +375,7 @@ void ast_endpoint_shutdown(struct ast_endpoint *endpoint)
 	}
 
 	ao2_unlink(endpoints, endpoint);
+	endpoint->tech_forward = stasis_forward_cancel(endpoint->tech_forward);
 
 	clear_msg = create_endpoint_snapshot_message(endpoint);
 	if (clear_msg) {
diff --git a/main/stasis_cache_pattern.c b/main/stasis_cache_pattern.c
index d916a48b1..bbe63ba1d 100644
--- a/main/stasis_cache_pattern.c
+++ b/main/stasis_cache_pattern.c
@@ -138,30 +138,6 @@ struct stasis_cp_single *stasis_cp_single_create(struct stasis_cp_all *all,
 {
 	RAII_VAR(struct stasis_cp_single *, one, NULL, ao2_cleanup);
 
-	one = stasis_cp_single_create_only(all, name);
-	if (!one) {
-		return NULL;
-	}
-
-	one->forward_topic_to_all = stasis_forward_all(one->topic, all->topic);
-	if (!one->forward_topic_to_all) {
-		return NULL;
-	}
-	one->forward_cached_to_all = stasis_forward_all(
-		stasis_caching_get_topic(one->topic_cached), all->topic_cached);
-	if (!one->forward_cached_to_all) {
-		return NULL;
-	}
-
-	ao2_ref(one, +1);
-	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;
@@ -176,25 +152,18 @@ struct stasis_cp_single *stasis_cp_single_create_only(struct stasis_cp_all *all,
 		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;;
+	one->forward_topic_to_all = stasis_forward_all(one->topic, all->topic);
+	if (!one->forward_topic_to_all) {
+		return NULL;
 	}
-
-	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;
+	one->forward_cached_to_all = stasis_forward_all(
+		stasis_caching_get_topic(one->topic_cached), all->topic_cached);
+	if (!one->forward_cached_to_all) {
+		return NULL;
 	}
 
-	return 0;
+	ao2_ref(one, +1);
+	return one;
 }
 
 void stasis_cp_single_unsubscribe(struct stasis_cp_single *one)