app.c: Remove deletion of pool topic on mwi state delete

As part of an earlier voicemail refactor, ast_delete_mwi_state_full
was modified to remove the pool topic for a mailbox when the state
was deleted.  This was an attempt to prevent stale topics from
accumulating when app_voicemail was reloaded and a mailbox went
away.  Unfortunately because of the fact that when app_voicemail
reloads, ALL mailboxes are deleted then only current ones recreated,
topics were being removed from the pool that still had subscribers
on them, then recreated as new topics of the same name.  So now
modules like res_pjsip_mwi are listening on a topic that will
never receive any messages because app_voicemail is publishing on
a different topic that happens to have the same name.  The solutiuon
to this is not easy and given that accumulating topics for
deleted mailboxes is less evil that not sending NOTIFYs...

* Removed the call to stasis_topic_pool_delete_topic in
  ast_delete_mwi_state_full.

Also:

* Fixed a topic reference leak in res_pjsip_mwi
  mwi_stasis_subscription_alloc.

* Added some debugging to mwi_stasis_subscription_alloc,
  stasis_topic_create, and topic_dtor.

* Fixed a topic reference leak in an error path in
  internal_stasis_subscribe.

ASTERISK-28306
Reported-by: Jared Hull
Change-Id: Id7da0990b3ac4be4b58491536b35f41291247b27

diff --git a/main/app.c b/main/app.c
index 3ed9ef249fb315a956394357ebca016fe4f4b5e4..89163dbeecb997793b3ce3ebf67e6e7789698dd0 100644 (file)
--- a/main/app.c
+++ b/main/app.c
@@ -3345,8 +3345,6 @@ int ast_delete_mwi_state_full(const char *mailbox, const char *context, struct a
                stasis_publish(mailbox_specific_topic, clear_msg);
        }
 
-       stasis_topic_pool_delete_topic(mwi_topic_pool, mwi_state->uniqueid);
-
        ao2_cleanup(clear_msg);
        return 0;
 }

diff --git a/main/stasis.c b/main/stasis.c
index 81ebfce4cc24f2adc8e9162a61d1b6cb15fd3e96..c0bb8b4cd951c12757c3298e5851ead0cc27fac8 100644 (file)
--- a/main/stasis.c
+++ b/main/stasis.c
@@ -400,6 +400,7 @@ static void topic_dtor(void *obj)
 
        AST_VECTOR_FREE(&topic->subscribers);
        AST_VECTOR_FREE(&topic->upstream_topics);
+       ast_debug(1, "Topic '%s': %p destroyed\n", topic->name, topic);
 
 #ifdef AST_DEVMODE
        if (topic->statistics) {
@@ -454,6 +455,8 @@ struct stasis_topic *stasis_topic_create(const char *name)
        strcpy(topic->name, name); /* SAFE */
        res |= AST_VECTOR_INIT(&topic->subscribers, INITIAL_SUBSCRIBERS_MAX);
        res |= AST_VECTOR_INIT(&topic->upstream_topics, 0);
+       ast_debug(1, "Topic '%s': %p created\n", topic->name, topic);
+
 #ifdef AST_DEVMODE
        topic->statistics = stasis_topic_statistics_create(topic);
        if (!topic->name || !topic->statistics || res)
@@ -752,6 +755,7 @@ struct stasis_subscription *internal_stasis_subscribe(
 
        if (topic_add_subscription(topic, sub) != 0) {
                ao2_ref(sub, -1);
+               ao2_ref(topic, -1);
 
                return NULL;
        }

diff --git a/res/res_pjsip_mwi.c b/res/res_pjsip_mwi.c
index eeb8a18a63d7bd2687ffba0cae89d17535d31636..72f8b59492c8c8f6e15835837961c70fcd84167b 100644 (file)
--- a/res/res_pjsip_mwi.c
+++ b/res/res_pjsip_mwi.c
@@ -259,10 +259,12 @@ static struct mwi_stasis_subscription *mwi_stasis_subscription_alloc(const char
        /* Safe strcpy */
        strcpy(mwi_stasis_sub->mailbox, mailbox);
 
-       ast_debug(3, "Creating stasis MWI subscription to mailbox %s for endpoint %s\n",
-               mailbox, mwi_sub->id);
+       ast_debug(3, "Creating stasis MWI subscription to mailbox %s for endpoint %s.  Topic: '%s':%p %d\n",
+               mailbox, mwi_sub->id, stasis_topic_name(topic), topic, (int)ao2_ref(topic, 0));
        ao2_ref(mwi_sub, +1);
        mwi_stasis_sub->stasis_sub = stasis_subscribe_pool(topic, mwi_stasis_cb, mwi_sub);
+       ao2_ref(topic, -1);
+
        if (!mwi_stasis_sub->stasis_sub) {
                /* Failed to subscribe. */
                ao2_ref(mwi_stasis_sub, -1);