Merge pull request #5446 from lafirest/chore/emqx_retainer

chore(emqx_retainer): simplified the retainer config

apps/emqx_retainer/etc/emqx_retainer.conf

@@ -61,21 +61,18 @@ emqx_retainer: {
 
   ## Storage connect parameters
   ##
-  ## Value: mnesia
+  ## Value: built_in_database
   ##
-  connector:
-    [
-      {
-       type: mnesia
-       config: {
-            ## storage_type: ram | disc | disc_only
-            storage_type: ram
+  config: {
 
-            ## Maximum number of retained messages. 0 means no limit.
-            ##
-            ## Value: Number >= 0
-            max_retained_messages: 0
-       }
-      }
-    ]
+    type: built_in_database
+
+    ## storage_type: ram | disc | disc_only
+    storage_type: ram
+
+    ## Maximum number of retained messages. 0 means no limit.
+    ##
+    ## Value: Number >= 0
+    max_retained_messages: 0
+    }
 }

apps/emqx_retainer/src/emqx_retainer.erl

@@ -338,16 +338,16 @@ get_msg_deliver_quota() ->
 update_config(#{clear_timer := ClearTimer,
                 release_quota_timer := QuotaTimer} = State, Conf) ->
     #{enable := Enable,
-      connector := [Connector | _],
+      config := Config,
       flow_control := #{quota_release_interval := QuotaInterval},
       msg_clear_interval := ClearInterval} = Conf,
 
-    #{connector := [OldConnector | _]} = emqx_config:get([?APP]),
+    #{config := OldConfig} = emqx_config:get([?APP]),
 
     case Enable of
         true ->
-            StorageType = maps:get(type, Connector),
-            OldStrorageType = maps:get(type, OldConnector),
+            StorageType = maps:get(type, Config),
+            OldStrorageType = maps:get(type, OldConfig),
             case OldStrorageType of
                 StorageType ->
                     State#{clear_timer := check_timer(ClearTimer,
@@ -368,9 +368,9 @@ update_config(#{clear_timer := ClearTimer,
 enable_retainer(#{context_id := ContextId} = State,
                 #{msg_clear_interval := ClearInterval,
                   flow_control := #{quota_release_interval := ReleaseInterval},
-                  connector := [Connector | _]}) ->
+                  config := Config}) ->
     NewContextId = ContextId + 1,
-    Context = create_resource(new_context(NewContextId), Connector),
+    Context = create_resource(new_context(NewContextId), Config),
     load(Context),
     State#{enable := true,
            context_id := NewContextId,
@@ -416,14 +416,19 @@ check_timer(Timer, _, _) ->
 
 -spec get_backend_module() -> backend().
 get_backend_module() ->
-    [#{type := Backend} | _] = emqx_config:get([?APP, connector]),
-    erlang:list_to_existing_atom(io_lib:format("~s_~s", [?APP, Backend])).
+    #{type := Backend} = emqx_config:get([?APP, config]),
+    ModName = if Backend =:= built_in_database ->
+                      mnesia;
+                 true ->
+                      Backend
+              end,
+    erlang:list_to_existing_atom(io_lib:format("~s_~s", [?APP, ModName])).
 
-create_resource(Context, #{type := mnesia, config := Cfg}) ->
+create_resource(Context, #{type := built_in_database} = Cfg) ->
     emqx_retainer_mnesia:create_resource(Cfg),
     Context;
 
-create_resource(Context, #{type := DB, config := Config}) ->
+create_resource(Context, #{type := DB} = Config) ->
     ResourceID = erlang:iolist_to_binary([io_lib:format("~s_~s", [?APP, DB])]),
     case emqx_resource:create(
            ResourceID,

apps/emqx_retainer/src/emqx_retainer_mnesia.erl

@@ -33,8 +33,6 @@
 
 -export([create_resource/1]).
 
--define(DEF_MAX_RETAINED_MESSAGES, 0).
-
 -rlog_shard({?RETAINER_SHARD, ?TAB}).
 
 -record(retained, {topic, msg, expiry_time}).
@@ -229,10 +227,7 @@ make_match_spec(Filter) ->
 
 -spec is_table_full() -> boolean().
 is_table_full() ->
-    [#{config := Cfg} | _] = emqx_config:get([?APP, connector]),
-    Limit = maps:get(max_retained_messages,
-                     Cfg,
-                     ?DEF_MAX_RETAINED_MESSAGES),
+    #{max_retained_messages := Limit} = emqx_config:get([?APP, config]),
     Limit > 0 andalso (table_size() >= Limit).
 
 -spec table_size() -> non_neg_integer().

apps/emqx_retainer/src/emqx_retainer_schema.erl

@@ -12,18 +12,14 @@ fields("emqx_retainer") ->
     [ {enable, t(boolean(), false)}
     , {msg_expiry_interval, t(emqx_schema:duration_ms(), "0s")}
     , {msg_clear_interval, t(emqx_schema:duration_ms(), "0s")}
-    , {connector, connector()}
     , {flow_control, ?TYPE(hoconsc:ref(?MODULE, flow_control))}
     , {max_payload_size, t(emqx_schema:bytesize(), "1MB")}
+    , {config, config()}
     ];
 
-fields(mnesia_connector) ->
-    [ {type, ?TYPE(hoconsc:union([mnesia]))}
-    , {config, ?TYPE(hoconsc:ref(?MODULE, mnesia_connector_cfg))}
-    ];
-
-fields(mnesia_connector_cfg) ->
-    [ {storage_type, t(hoconsc:union([ram, disc, disc_only]), ram)}
+fields(mnesia_config) ->
+    [ {type, ?TYPE(hoconsc:union([built_in_database]))}
+    , {storage_type, t(hoconsc:union([ram, disc, disc_only]), ram)}
     , {max_retained_messages, t(integer(), 0, fun is_pos_integer/1)}
     ];
 
@@ -43,11 +39,8 @@ t(Type, Default, Validator) ->
     hoconsc:t(Type, #{default => Default,
                       validator => Validator}).
 
-union_array(Item) when is_list(Item) ->
-    hoconsc:array(hoconsc:union(Item)).
-
 is_pos_integer(V) ->
     V >= 0.
 
-connector() ->
-    #{type => union_array([hoconsc:ref(?MODULE, mnesia_connector)])}.
+config() ->
+    #{type => hoconsc:union([hoconsc:ref(?MODULE, mnesia_config)])}.

apps/emqx_retainer/test/emqx_retainer_SUITE.erl

@@ -67,14 +67,13 @@ new_emqx_retainer_conf() ->
     #{enable => true,
       msg_expiry_interval => 0,
       msg_clear_interval => 0,
-      connector => [#{type => mnesia,
-                      config =>
-                          #{max_retained_messages => 0,
-                            storage_type => ram}}],
+      config => #{type => built_in_database,
+                  max_retained_messages => 0,
+                  storage_type => ram},
       flow_control => #{max_read_number => 0,
                         msg_deliver_quota => 0,
                         quota_release_interval => 0},
-                      max_payload_size => 1024 * 1024}.
+      max_payload_size => 1024 * 1024}.
 
 %%--------------------------------------------------------------------
 %% Test Cases