fix(relup): add module emqx_relup

scripts/inject-relup.escript

@@ -49,13 +49,14 @@ inject_relup_instrs(Type, CurrRelVsn, RUs) ->
 %% the instruction lists.
 append_emqx_relup_instrs(Type, CurrRelVsn, Vsn, Instrs) ->
   CallbackFun = relup_callback_func(Type),
+  Extra = #{}, %% we may need some extended args
   case lists:reverse(Instrs) of
     [{apply, {emqx_relup, CallbackFun, _}} | _] ->
       Instrs;
     RInstrs ->
       lists:reverse([ {load_object_code, {emqx, CurrRelVsn, [emqx_relup]}}
                     , {load, {emqx_relup, brutal_purge, soft_purge}}
-                    , {apply, {emqx_relup, CallbackFun, [CurrRelVsn, Vsn]}}
+                    , {apply, {emqx_relup, CallbackFun, [CurrRelVsn, Vsn, Extra]}}
                     | RInstrs])
   end.
 

src/emqx_relup.erl

@@ -0,0 +1,17 @@
+-module(emqx_relup).
+
+-export([ post_release_upgrade/3
+        , post_release_downgrade/3
+        ]).
+
+post_release_upgrade(_CurrRelVsn, _FromVsn, _) ->
+    reload_components().
+
+post_release_downgrade(_CurrRelVsn, _ToVsn, _) ->
+    reload_components().
+
+reload_components() ->
+    io:format("reloading resource providers ..."),
+    emqx_rule_engine:load_providers(),
+    io:format("loading plugins ..."),
+    emqx_plugins:load().