res_sorcery_memory_cache: Add support for a full backend cache.

This change introduces the configuration option 'full_backend_cache'
which changes the cache to be a full mirror of the backend instead
of a per-object cache. This allows all sorcery retrieval operations
to be carried out against it and is useful for object types which
are used in a "retrieve all" or "retrieve some" pattern.

ASTERISK-25625 #close

Change-Id: Ie2993487e9c19de563413ad5561c7403b48caab5

CHANGES

@@ -68,6 +68,14 @@ res_pjsip
    - A TIMER statistic for the RTT time for each qualified contact, e.g.:
        PJSIP.contacts.alice@@127.0.0.1:5061.rtt
 
+res_sorcery_memory_cache
+------------------------
+ * A new caching strategy, full_backend_cache, has been added which caches
+   all stored objects in the backend. When enabled all objects will be
+   expired or go stale according to the configuration. As well when enabled
+   all retrieval operations will be performed against the cache instead of
+   the backend.
+
 func_callerid
 -------------------
  * CALLERID(pres) is now documented as a valid alternative to setting both

main/sorcery.c

@@ -1897,7 +1897,7 @@ void *ast_sorcery_retrieve_by_fields(const struct ast_sorcery *sorcery, const ch
 			}
 		}
 
-		if ((flags & AST_RETRIEVE_FLAG_MULTIPLE) || !object) {
+		if (((flags & AST_RETRIEVE_FLAG_MULTIPLE) && (!ao2_container_count(object) || !wizard->caching)) || !object) {
 			continue;
 		}
 
@@ -1935,6 +1935,10 @@ struct ao2_container *ast_sorcery_retrieve_by_regex(const struct ast_sorcery *so
 		}
 
 		wizard->wizard->callbacks.retrieve_regex(sorcery, wizard->data, object_type->name, objects, regex);
+
+		if (wizard->caching && ao2_container_count(objects)) {
+			break;
+		}
 	}
 	AST_VECTOR_RW_UNLOCK(&object_type->wizards);
 

res/res_pjsip_endpoint_identifier_ip.c

@@ -465,7 +465,7 @@ static int load_module(void)
 	ast_sorcery_object_field_register(ast_sip_get_sorcery(), "identify", "type", "", OPT_NOOP_T, 0, 0);
 	ast_sorcery_object_field_register(ast_sip_get_sorcery(), "identify", "endpoint", "", OPT_STRINGFIELD_T, 0, STRFLDSET(struct ip_identify_match, endpoint_name));
 	ast_sorcery_object_field_register_custom(ast_sip_get_sorcery(), "identify", "match", "", ip_identify_match_handler, match_to_str, match_to_var_list, 0, 0);
-	ast_sorcery_reload_object(ast_sip_get_sorcery(), "identify");
+	ast_sorcery_load_object(ast_sip_get_sorcery(), "identify");
 
 	ast_sip_register_endpoint_identifier_with_name(&ip_identifier, "ip");
 	ast_sip_register_endpoint_formatter(&endpoint_identify_formatter);