fix: return error reason from dynamo connector status check

apps/emqx_bridge_dynamo/src/emqx_bridge_dynamo_connector.erl

@@ -178,14 +178,34 @@ on_batch_query(InstanceId, [{_ChannelId, _} | _] = Query, State) ->
 on_batch_query(_InstanceId, Query, _State) ->
     {error, {unrecoverable_error, {invalid_request, Query}}}.
 
-on_get_status(_InstanceId, #{pool_name := Pool}) ->
+health_check_timeout() ->
+    15000.
+
+on_get_status(_InstanceId, #{pool_name := Pool} = State) ->
     Health = emqx_resource_pool:health_check_workers(
-        Pool, {emqx_bridge_dynamo_connector_client, is_connected, []}
+        Pool,
+        {emqx_bridge_dynamo_connector_client, is_connected, [
+            emqx_resource_pool:health_check_timeout()
+        ]},
+        health_check_timeout(),
+        #{return_values => true}
     ),
-    status_result(Health).
+    case Health of
+        {error, timeout} ->
+            {?status_connecting, State, <<"timeout_while_checking_connection">>};
+        {ok, Results} ->
+            status_result(Results, State)
+    end.
 
-status_result(_Status = true) -> ?status_connected;
-status_result(_Status = false) -> ?status_connecting.
+status_result(Results, State) ->
+    case lists:filter(fun(Res) -> Res =/= true end, Results) of
+        [] when Results =:= [] ->
+            ?status_connecting;
+        [] ->
+            ?status_connected;
+        [{false, Error} | _] ->
+            {?status_connecting, State, Error}
+    end.
 
 %%========================================================================================
 %% Helper fns

apps/emqx_bridge_dynamo/src/emqx_bridge_dynamo_connector_client.erl

@@ -9,7 +9,7 @@
 %% API
 -export([
     start_link/1,
-    is_connected/1,
+    is_connected/2,
     query/4
 ]).
 
@@ -27,20 +27,15 @@
 -export([execute/2]).
 -endif.
 
-%% The default timeout for DynamoDB REST API calls is 10 seconds,
-%% but this value for `gen_server:call` is 5s,
-%% so we should pass the timeout to `gen_server:call`
--define(HEALTH_CHECK_TIMEOUT, 10000).
-
 %%%===================================================================
 %%% API
 %%%===================================================================
-is_connected(Pid) ->
+is_connected(Pid, Timeout) ->
     try
-        gen_server:call(Pid, is_connected, ?HEALTH_CHECK_TIMEOUT)
+        gen_server:call(Pid, is_connected, Timeout)
     catch
-        _:_ ->
-            false
+        _:Error ->
+            {false, Error}
     end.
 
 query(Pid, Table, Query, Templates) ->
@@ -76,8 +71,8 @@ handle_call(is_connected, _From, State) ->
         case erlcloud_ddb2:list_tables([{limit, 1}]) of
             {ok, _} ->
                 true;
-            _ ->
-                false
+            Error ->
+                {false, Error}
         end,
     {reply, IsConnected, State};
 handle_call({query, Table, Query, Templates}, _From, State) ->

changes/ee/fix-12678.en.md

@@ -0,0 +1 @@
+The DynamoDB connector now explicitly reports the error reason upon connection failure. This update addresses the previous limitation where connection failures did not result in any explanation.