pjsip_options: Schedule/unschedule qualifies on AoR creation/destruction

When an AoR is created or destroyed dynamically, the scheduled OPTIONS
requests that qualify the contacts on the AoR are not necessarily started
or destroyed, particularly for persistent contacts created for that AoR.
This patch adds create/update/delete sorcery observers for an AoR, which
schedule/unschedule the qualifies as expected.

Change-Id: Ic287ed2e2952a7808ee068776fe966f9554bdf7d

res/res_pjsip/pjsip_options.c

@@ -1026,6 +1026,7 @@ static int qualify_and_schedule_cb(void *obj, void *arg, int flags)
 
 	initial_interval = (int)((initial_interval * 1000) * ast_random_double());
 
+	unschedule_qualify(contact);
 	if (contact->qualify_frequency) {
 		schedule_qualify(contact, initial_interval);
 	} else {
@@ -1155,6 +1156,43 @@ static struct ast_sip_endpoint_formatter contact_status_formatter = {
 	.format_ami = format_ami_contact_status
 };
 
+static void aor_observer_modified(const void *obj)
+{
+	struct ast_sip_aor *aor = (void *)obj;
+	struct ao2_container *contacts;
+
+	contacts = ast_sip_location_retrieve_aor_contacts(aor);
+	if (contacts) {
+		ao2_callback(contacts, OBJ_NODATA, qualify_and_schedule_cb, aor);
+		ao2_ref(contacts, -1);
+	}
+}
+
+static int unschedule_contact_cb(void *obj, void *arg, int flags)
+{
+	unschedule_qualify(obj);
+
+	return CMP_MATCH;
+}
+
+static void aor_observer_deleted(const void *obj)
+{
+	const struct ast_sip_aor *aor = obj;
+	struct ao2_container *contacts;
+
+	contacts = ast_sip_location_retrieve_aor_contacts(aor);
+	if (contacts) {
+		ao2_callback(contacts, OBJ_NODATA, unschedule_contact_cb, NULL);
+		ao2_ref(contacts, -1);
+	}
+}
+
+static const struct ast_sorcery_observer observer_callbacks_options = {
+	.created = aor_observer_modified,
+	.updated = aor_observer_modified,
+	.deleted = aor_observer_deleted
+};
+
 int ast_res_pjsip_init_options_handling(int reload)
 {
 	static const pj_str_t STR_OPTIONS = { "OPTIONS", 7 };
@@ -1185,6 +1223,13 @@ int ast_res_pjsip_init_options_handling(int reload)
 		return -1;
 	}
 
+	if (ast_sorcery_observer_add(ast_sip_get_sorcery(), "aor", &observer_callbacks_options)) {
+		pjsip_endpt_unregister_module(ast_sip_get_pjsip_endpoint(), &options_module);
+		ao2_cleanup(sched_qualifies);
+		sched_qualifies = NULL;
+		return -1;
+	}
+
 	internal_sip_register_endpoint_formatter(&contact_status_formatter);
 	ast_manager_register2("PJSIPQualify", EVENT_FLAG_SYSTEM | EVENT_FLAG_REPORTING, ami_sip_qualify, NULL, NULL, NULL);
 	ast_cli_register_multiple(cli_options, ARRAY_LEN(cli_options));
@@ -1200,6 +1245,7 @@ void ast_res_pjsip_cleanup_options_handling(void)
 	ast_manager_unregister("PJSIPQualify");
 	internal_sip_unregister_endpoint_formatter(&contact_status_formatter);
 
+	ast_sorcery_observer_remove(ast_sip_get_sorcery(), "aor", &observer_callbacks_options);
 	pjsip_endpt_unregister_module(ast_sip_get_pjsip_endpoint(), &options_module);
 	ao2_cleanup(sched_qualifies);
 	sched_qualifies = NULL;