chore(gw): return unloaded status instead of 404

apps/emqx_gateway/src/emqx_gateway_api.erl

@@ -92,10 +92,30 @@ gateway_insta(delete, #{bindings := #{name := Name0}}) ->
         end
     end);
 gateway_insta(get, #{bindings := #{name := Name0}}) ->
-    with_gateway(Name0, fun(_, _) ->
+    try
-        GwConf = emqx_gateway_conf:gateway(Name0),
+        GwName = try
-        {200, GwConf#{<<"name">> => Name0}}
+                     binary_to_existing_atom(Name0)
-    end);
+                 catch _ : _ -> error(badname)
+                 end,
+        case emqx_gateway:lookup(GwName) of
+            undefined ->
+                {200, #{name => GwName, status => unloaded}};
+            Gateway ->
+                GwConf = emqx_gateway_conf:gateway(Name0),
+                GwInfo0 = emqx_gateway_utils:unix_ts_to_rfc3339(
+                            [created_at, started_at, stopped_at],
+                            Gateway),
+                GwInfo1 = maps:with([name,
+                                     status,
+                                     created_at,
+                                     started_at,
+                                     stopped_at], GwInfo0),
+                {200, maps:merge(GwConf, GwInfo1)}
+        end
+    catch
+        error : badname ->
+            return_http_error(400, "Bad gateway name")
+    end;
 gateway_insta(put, #{body := GwConf,
                      bindings := #{name := Name0}
                     }) ->