Prevent slow graceful shutdown when outbound publications never started.

The code was missing the case for explicitly destroying an outbound publication
when Asterisk had never actually published anything. The result was that Asterisk
would hang for a while on a graceful shutdown.

With this change, the case is taken into account, and on a graceful shutdown, these
publications are destroyed without the need to actually send a PUBLISH request.

ASTERISK-24655 #close
Reported by Kevin Harwell

Review: https://reviewboard.asterisk.org/r/4325
........

Merged revisions 430608 from http://svn.asterisk.org/svn/asterisk/branches/13


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@430609 65c4cc65-6c06-0410-ace0-fbb531ad65f3

res/res_pjsip_outbound_publish.c

@@ -662,25 +662,40 @@ static void sip_outbound_publish_client_destroy(void *obj)
 	}
 }
 
+static int explicit_publish_destroy(void *data)
+{
+	struct ast_sip_outbound_publish_client *client = data;
+
+	pjsip_publishc_destroy(client->client);
+	ao2_ref(client, -1);
+
+	return 0;
+}
+
 /*! \brief Helper function which cancels and un-publishes a no longer used client */
 static int cancel_and_unpublish(struct ast_sip_outbound_publish_client *client)
 {
+	struct ast_sip_event_publisher_handler *handler;
 	SCOPED_AO2LOCK(lock, client);
 
-	/* If this publish client is currently publishing stop and terminate any refresh timer */
+	if (!client->started) {
-	if (client->started) {
+		/* If the client was never started, there's nothing to unpublish, so just
-		struct ast_sip_event_publisher_handler *handler = find_publisher_handler_for_event_name(client->publish->event);
+		 * destroy the publication and remove its reference to the client.
+		 */
+		ast_sip_push_task(NULL, explicit_publish_destroy, client);
+		return 0;
+	}
 
-		if (handler) {
+	handler = find_publisher_handler_for_event_name(client->publish->event);
-			handler->stop_publishing(client);
+	if (handler) {
-		}
+		handler->stop_publishing(client);
+	}
 
-		client->started = 0;
+	client->started = 0;
-		if (ast_sip_push_task(NULL, cancel_refresh_timer_task, ao2_bump(client))) {
+	if (ast_sip_push_task(NULL, cancel_refresh_timer_task, ao2_bump(client))) {
-			ast_log(LOG_WARNING, "Could not stop refresh timer on outbound publish '%s'\n",
+		ast_log(LOG_WARNING, "Could not stop refresh timer on outbound publish '%s'\n",
-				ast_sorcery_object_get_id(client->publish));
+			ast_sorcery_object_get_id(client->publish));
-			ao2_ref(client, -1);
+		ao2_ref(client, -1);
-		}
 	}
 
 	/* If nothing is being sent right now send the unpublish - the destroy will happen in the subsequent callback */