fix(tdengine): enhanced health check result, make it more sense

apps/emqx_bridge_tdengine/src/emqx_bridge_tdengine_connector.erl

@@ -6,10 +6,11 @@
 
 -behaviour(emqx_resource).
 
--include_lib("typerefl/include/types.hrl").
--include_lib("emqx/include/logger.hrl").
--include_lib("snabbkaffe/include/snabbkaffe.hrl").
 -include_lib("hocon/include/hoconsc.hrl").
+-include_lib("emqx/include/logger.hrl").
+-include_lib("typerefl/include/types.hrl").
+-include_lib("snabbkaffe/include/snabbkaffe.hrl").
+-include_lib("emqx_resource/include/emqx_resource.hrl").
 
 -export([namespace/0, roots/0, fields/1, desc/1]).
 
@@ -209,18 +210,50 @@ on_batch_query(InstanceId, BatchReq, State) ->
     ?SLOG(error, LogMeta#{msg => "invalid_request"}),
     {error, {unrecoverable_error, invalid_request}}.
 
-on_get_status(_InstanceId, #{pool_name := PoolName}) ->
-    Health = emqx_resource_pool:health_check_workers(PoolName, fun ?MODULE:do_get_status/1),
-    status_result(Health).
-
-do_get_status(Conn) ->
-    case tdengine:insert(Conn, "select server_version()", []) of
-        {ok, _} -> true;
-        _ -> false
+on_get_status(_InstanceId, #{pool_name := PoolName} = State) ->
+    case
+        emqx_resource_pool:health_check_workers(
+            PoolName,
+            fun ?MODULE:do_get_status/1,
+            emqx_resource_pool:health_check_timeout(),
+            #{return_values => true}
+        )
+    of
+        {ok, []} ->
+            {?status_connecting, State, undefined};
+        {ok, Values} ->
+            case lists:keyfind(error, 1, Values) of
+                false ->
+                    ?status_connected;
+                {error, Reason} ->
+                    {?status_connecting, State, enhance_reason(Reason)}
+            end;
+        {error, Reason} ->
+            {?status_connecting, State, enhance_reason(Reason)}
     end.
 
-status_result(_Status = true) -> connected;
-status_result(_Status = false) -> connecting.
+do_get_status(Conn) ->
+    try
+        tdengine:insert(
+            Conn,
+            "select server_version()",
+            [],
+            emqx_resource_pool:health_check_timeout()
+        )
+    of
+        {ok, _} ->
+            true;
+        {error, _} = Error ->
+            Error
+    catch
+        _Type:Reason ->
+            {error, Reason}
+    end.
+
+enhance_reason(timeout) ->
+    connection_timeout;
+enhance_reason(Reason) ->
+    Reason.
 
 on_add_channel(
     _InstanceId,
@@ -253,7 +286,12 @@ on_get_channels(InstanceId) ->
 on_get_channel_status(InstanceId, ChannelId, #{channels := Channels} = State) ->
     case maps:is_key(ChannelId, Channels) of
         true ->
-            on_get_status(InstanceId, State);
+            case on_get_status(InstanceId, State) of
+                {Status, _State, Reason} ->
+                    {Status, Reason};
+                Status ->
+                    Status
+            end;
         _ ->
             {error, not_exists}
     end.