fix(iotdb): use the `ping` API to check the status of the IOTDB connections

apps/emqx_bridge_http/src/emqx_bridge_http_connector.erl

@@ -31,6 +31,7 @@
     on_query/3,
     on_query_async/4,
     on_get_status/2,
+    on_get_status/3,
     on_add_channel/4,
     on_remove_channel/3,
     on_get_channels/1,
@@ -50,7 +51,7 @@
 %% for other http-like connectors.
 -export([redact_request/1]).
 
--export([validate_method/1, join_paths/2]).
+-export([validate_method/1, join_paths/2, formalize_request/3, transform_result/1]).
 
 -define(DEFAULT_PIPELINE_SIZE, 100).
 -define(DEFAULT_REQUEST_TIMEOUT_MS, 30_000).
@@ -511,8 +512,11 @@ resolve_pool_worker(#{pool_name := PoolName} = State, Key) ->
 on_get_channels(ResId) ->
     emqx_bridge_v2:get_channels_for_connector(ResId).
 
-on_get_status(InstId, #{pool_name := InstId, connect_timeout := Timeout} = State) ->
+on_get_status(InstId, State) ->
-    case do_get_status(InstId, Timeout) of
+    on_get_status(InstId, State, fun default_health_checker/2).
+
+on_get_status(InstId, #{pool_name := InstId, connect_timeout := Timeout} = State, DoPerWorker) ->
+    case do_get_status(InstId, Timeout, DoPerWorker) of
         ok ->
             connected;
         {error, still_connecting} ->
@@ -522,17 +526,11 @@ on_get_status(InstId, #{pool_name := InstId, connect_timeout := Timeout} = State
     end.
 
 do_get_status(PoolName, Timeout) ->
+    do_get_status(PoolName, Timeout, fun default_health_checker/2).
+
+do_get_status(PoolName, Timeout, DoPerWorker) ->
     Workers = [Worker || {_WorkerName, Worker} <- ehttpc:workers(PoolName)],
-    DoPerWorker =
+    try emqx_utils:pmap(fun(Worker) -> DoPerWorker(Worker, Timeout) end, Workers, Timeout) of
-        fun(Worker) ->
-            case ehttpc:health_check(Worker, Timeout) of
-                ok ->
-                    ok;
-                {error, _} = Error ->
-                    Error
-            end
-        end,
-    try emqx_utils:pmap(DoPerWorker, Workers, Timeout) of
         [] ->
             {error, still_connecting};
         [_ | _] = Results ->
@@ -557,6 +555,14 @@ do_get_status(PoolName, Timeout) ->
             {error, timeout}
     end.
 
+default_health_checker(Worker, Timeout) ->
+    case ehttpc:health_check(Worker, Timeout) of
+        ok ->
+            ok;
+        {error, _} = Error ->
+            Error
+    end.
+
 on_get_channel_status(
     InstId,
     _ChannelId,

apps/emqx_bridge_iotdb/src/emqx_bridge_iotdb_connector.erl

@@ -66,6 +66,7 @@
 -type manager_id() :: binary().
 
 -define(CONNECTOR_TYPE, iotdb).
+-define(IOTDB_PING_PATH, <<"ping">>).
 
 -import(hoconsc, [mk/2, enum/1, ref/2]).
 
@@ -238,8 +239,26 @@ on_stop(InstanceId, State) ->
 
 -spec on_get_status(manager_id(), state()) ->
     {connected, state()} | {disconnected, state(), term()}.
-on_get_status(InstanceId, State) ->
+on_get_status(InstanceId, #{base_path := BasePath} = State) ->
-    emqx_bridge_http_connector:on_get_status(InstanceId, State).
+    Func = fun(Worker, Timeout) ->
+        Request = {?IOTDB_PING_PATH, [], undefined},
+        NRequest = emqx_bridge_http_connector:formalize_request(get, BasePath, Request),
+        Result0 = ehttpc:request(Worker, get, NRequest, Timeout),
+        case emqx_bridge_http_connector:transform_result(Result0) of
+            {ok, 200, _, Body} ->
+                case emqx_utils_json:decode(Body) of
+                    #{<<"code">> := 200} ->
+                        ok;
+                    Json ->
+                        {error, {unexpected_status, Json}}
+                end;
+            {error, _} = Error ->
+                Error;
+            Result ->
+                {error, {unexpected_ping_result, Result}}
+        end
+    end,
+    emqx_bridge_http_connector:on_get_status(InstanceId, State, Func).
 
 -spec on_query(manager_id(), {send_message, map()}, state()) ->
     {ok, pos_integer(), [term()], term()}
@@ -352,13 +371,8 @@ on_remove_channel(InstanceId, #{channels := Channels} = OldState0, ChannelId) ->
 on_get_channels(InstanceId) ->
     emqx_bridge_v2:get_channels_for_connector(InstanceId).
 
-on_get_channel_status(_InstanceId, ChannelId, #{channels := Channels}) ->
+on_get_channel_status(InstanceId, _ChannelId, State) ->
-    case maps:is_key(ChannelId, Channels) of
+    on_get_status(InstanceId, State).
-        true ->
-            connected;
-        _ ->
-            {error, not_exists}
-    end.
 
 %%--------------------------------------------------------------------
 %% Internal Functions