fix(resource): re-create the helth checker if already exists

apps/emqx_resource/src/emqx_resource_health_check.erl

@@ -15,14 +15,47 @@
 %%--------------------------------------------------------------------
 -module(emqx_resource_health_check).
 
--export([start_link/2]).
+-export([ start_link/2
+        , create_checker/2
+        , delete_checker/1
+        ]).
 
 -export([health_check/2]).
 
+-define(SUP, emqx_resource_health_check_sup).
+-define(ID(NAME), {resource_health_check, NAME}).
+
+child_spec(Name, Sleep) ->
+    #{id => ?ID(Name),
+      start => {?MODULE, start_link, [Name, Sleep]},
+      restart => transient,
+      shutdown => 5000, type => worker, modules => [?MODULE]}.
+
 start_link(Name, Sleep) ->
     Pid = proc_lib:spawn_link(?MODULE, health_check, [Name, Sleep]),
     {ok, Pid}.
 
+create_checker(Name, Sleep) ->
+    case supervisor:start_child(?SUP, child_spec(Name, Sleep)) of
+        {ok, _} -> ok;
+        {error, already_present} -> ok;
+        {error, {already_started, _}} ->
+            ok = delete_checker(Name),
+            create_checker(Name, Sleep);
+        Error -> Error
+    end.
+
+delete_checker(Name) ->
+    case supervisor:terminate_child(?SUP, {health_check, Name}) of
+        ok ->
+            case supervisor:delete_child(?SUP, {health_check, Name}) of
+                {error, not_found} -> ok;
+                Error -> Error
+            end;
+        {error, not_found} -> ok;
+        Error -> Error
+	end.
+
 health_check(Name, SleepTime) ->
     timer:sleep(SleepTime),
     case emqx_resource:health_check(Name) of

apps/emqx_resource/src/emqx_resource_health_check_sup.erl

@@ -19,18 +19,7 @@
 
 -export([start_link/0]).
 
--export([init/1,
-         create_checker/2,
-         delete_checker/1]).
-
--define(HEALTH_CHECK_MOD, emqx_resource_health_check).
--define(ID(NAME), {resource_health_check, NAME}).
-
-child_spec(Name, Sleep) ->
-    #{id => ?ID(Name),
-      start => {?HEALTH_CHECK_MOD, start_link, [Name, Sleep]},
-      restart => transient,
-      shutdown => 5000, type => worker, modules => [?HEALTH_CHECK_MOD]}.
+-export([init/1]).
 
 start_link() ->
     supervisor:start_link({local, ?MODULE}, ?MODULE, []).
@@ -38,22 +27,3 @@ start_link() ->
 init([]) ->
     SupFlags = #{strategy => one_for_one, intensity => 10, period => 10},
     {ok, {SupFlags, []}}.
-
-create_checker(Name, Sleep) ->
-    case supervisor:start_child(?MODULE, child_spec(Name, Sleep)) of
-        {ok, _} -> ok;
-        {error, already_present} -> ok;
-        {error, {already_started, _}} -> ok;
-        Error -> Error
-    end.
-
-delete_checker(Name) ->
-    case supervisor:terminate_child(?MODULE, {health_check, Name}) of
-        ok ->
-            case supervisor:delete_child(?MODULE, {health_check, Name}) of
-                {error, not_found} -> ok;
-                Error -> Error
-            end;
-        {error, not_found} -> ok;
-        Error -> Error
-	end.

apps/emqx_resource/src/emqx_resource_instance.erl

@@ -238,7 +238,7 @@ start_and_check(InstId, ResourceType, Config, Opts, Data) ->
             ets:insert(emqx_resource_instance, {InstId, Data2}),
             case maps:get(async_create, Opts, false) of
                 false -> do_health_check(Data2);
-                true -> emqx_resource_health_check_sup:create_checker(InstId,
+                true -> emqx_resource_health_check:create_checker(InstId,
                             maps:get(health_check_interval, Opts, 15000))
             end;
         {error, Reason} ->
@@ -252,7 +252,7 @@ do_stop(#{state := undefined}) ->
     ok;
 do_stop(#{id := InstId, mod := Mod, state := ResourceState} = Data) ->
     _ = emqx_resource:call_stop(InstId, Mod, ResourceState),
-    ok = emqx_resource_health_check_sup:delete_checker(InstId),
+    ok = emqx_resource_health_check:delete_checker(InstId),
     ets:insert(emqx_resource_instance, {InstId, Data#{status => stopped}}),
     ok.