sorcery: Add setting object type congestion levels.

Sorcery creates taskprocessors for object types to process object observer
callbacks.  An API call is needed to be able to set the congestion levels
of these taskprocessors for selected object types.

* Updated PJSIP's contact and contact_status sorcery object type observer
default congestion levels based upon stress testing.  Increased the
congestion levels to reduce the potential for bursty register/unregister
and subscribe/unsubscribe activity from triggering the taskprocessor
overload alert.

ASTERISK-26088
Reported by:  Richard Mudgett

Change-Id: I4542e83b556f0714009bfeff89505c801f1218c6

include/asterisk/sorcery.h

@@ -694,6 +694,20 @@ int __ast_sorcery_object_register(struct ast_sorcery *sorcery, const char *type,
 #define ast_sorcery_internal_object_register(sorcery, type, alloc, transform, apply) \
 	__ast_sorcery_object_register((sorcery), (type), 1, 1, (alloc), (transform), (apply))
 
+/*!
+ * \brief Set the high and low alert water marks of the sorcery object type.
+ * \since 13.10.0
+ *
+ * \param sorcery Pointer to a sorcery structure
+ * \param type Type of object
+ * \param low_water New queue low water mark. (-1 to set as 90% of high_water)
+ * \param high_water New queue high water mark.
+ *
+ * \retval 0 on success.
+ * \retval -1 on error (water marks not changed).
+ */
+int ast_sorcery_object_set_congestion_levels(struct ast_sorcery *sorcery, const char *type, long low_water, long high_water);
+
 /*!
  * \brief Set the copy handler for an object type
  *

main/sorcery.c

@@ -1164,6 +1164,20 @@ int __ast_sorcery_object_register(struct ast_sorcery *sorcery, const char *type,
 	return 0;
 }
 
+int ast_sorcery_object_set_congestion_levels(struct ast_sorcery *sorcery, const char *type, long low_water, long high_water)
+{
+	struct ast_sorcery_object_type *object_type;
+	int res = -1;
+
+	object_type = ao2_find(sorcery->types, type, OBJ_SEARCH_KEY);
+	if (object_type) {
+		res = ast_taskprocessor_alert_set_levels(object_type->serializer,
+			low_water, high_water);
+		ao2_ref(object_type, -1);
+	}
+	return res;
+}
+
 void ast_sorcery_object_set_copy_handler(struct ast_sorcery *sorcery, const char *type, sorcery_copy_handler copy)
 {
 	RAII_VAR(struct ast_sorcery_object_type *, object_type, ao2_find(sorcery->types, type, OBJ_KEY), ao2_cleanup);

res/res_pjsip/location.c

@@ -25,6 +25,7 @@
 #include "asterisk/astobj2.h"
 #include "asterisk/paths.h"
 #include "asterisk/sorcery.h"
+#include "asterisk/taskprocessor.h"
 #include "include/res_pjsip_private.h"
 #include "asterisk/res_pjsip_cli.h"
 #include "asterisk/statsd.h"
@@ -1114,6 +1115,8 @@ int ast_sip_initialize_sorcery_location(void)
 	ast_pjproject_get_buildopt("PJSIP_MAX_URL_SIZE", "%d", &pjsip_max_url_size);
 
 	ast_sorcery_apply_default(sorcery, "contact", "astdb", "registrar");
+	ast_sorcery_object_set_congestion_levels(sorcery, "contact", -1,
+		3 * AST_TASKPROCESSOR_HIGH_WATER_LEVEL);
 	ast_sorcery_apply_default(sorcery, "aor", "config", "pjsip.conf,criteria=type=aor");
 
 	if (ast_sorcery_object_register(sorcery, "contact", contact_alloc, NULL, contact_apply_handler) ||

res/res_pjsip/pjsip_options.c

@@ -31,6 +31,7 @@
 #include "asterisk/test.h"
 #include "asterisk/statsd.h"
 #include "include/res_pjsip_private.h"
+#include "asterisk/taskprocessor.h"
 
 #define DEFAULT_LANGUAGE "en"
 #define DEFAULT_ENCODING "text/plain"
@@ -1004,6 +1005,8 @@ int ast_sip_initialize_sorcery_qualify(void)
 
 	/* initialize sorcery ast_sip_contact_status resource */
 	ast_sorcery_apply_default(sorcery, CONTACT_STATUS, "memory", NULL);
+	ast_sorcery_object_set_congestion_levels(sorcery, CONTACT_STATUS, -1,
+		3 * AST_TASKPROCESSOR_HIGH_WATER_LEVEL);
 
 	if (ast_sorcery_internal_object_register(sorcery, CONTACT_STATUS,
 					contact_status_alloc, NULL, NULL)) {