fix: return 409 in case of duplicate

apps/emqx_management/src/emqx_mgmt_api_trace.erl

@@ -84,11 +84,16 @@ schema("/trace") ->
                 200 => hoconsc:ref(trace),
                 400 => emqx_dashboard_swagger:error_codes(
                     [
-                        'ALREADY_EXISTS',
-                        'DUPLICATE_CONDITION',
                         'INVALID_PARAMS'
                     ],
-                    <<"trace name already exists">>
+                    <<"invalid trace params">>
+                ),
+                409 => emqx_dashboard_swagger:error_codes(
+                    [
+                        'ALREADY_EXISTS',
+                        'DUPLICATE_CONDITION'
+                    ],
+                    <<"trace already exists">>
                 )
             }
         },
@@ -392,12 +397,12 @@ trace(post, #{body := Param}) ->
         {ok, Trace0} ->
             {200, format_trace(Trace0)};
         {error, {already_existed, Name}} ->
-            {400, #{
+            {409, #{
                 code => 'ALREADY_EXISTS',
                 message => ?TO_BIN([Name, " Already Exists"])
             }};
         {error, {duplicate_condition, Name}} ->
-            {400, #{
+            {409, #{
                 code => 'DUPLICATE_CONDITION',
                 message => ?TO_BIN([Name, " Duplication Condition"])
             }};

apps/emqx_management/test/emqx_mgmt_api_trace_SUITE.erl

@@ -149,7 +149,7 @@ t_create_failed(_Config) ->
     {ok, Create} = request_api(post, api_path("trace"), Header, [GoodName | Trace]),
     ?assertMatch(#{<<"name">> := <<"test-name-0">>}, json(Create)),
     ?assertMatch(
-        {error, {"HTTP/1.1", 400, _}, _},
+        {error, {"HTTP/1.1", 409, _}, _},
         request_api(post, api_path("trace"), Header, [GoodName | Trace])
     ),
 
@@ -171,6 +171,16 @@ t_create_failed(_Config) ->
         {error, {"HTTP/1.1", 400, _}, _},
         request_api(post, api_path("trace"), Header, [GoodName1 | Trace])
     ),
+    %% clear
+    ?assertMatch({ok, _}, request_api(delete, api_path("trace"), Header, [])),
+    {ok, Create} = request_api(post, api_path("trace"), Header, [GoodName | Trace]),
+    %% new name but same trace
+    GoodName2 = {<<"name">>, <<"test-name-1">>},
+    ?assertMatch(
+        {error, {"HTTP/1.1", 409, _}, _},
+        request_api(post, api_path("trace"), Header, [GoodName2 | Trace])
+    ),
+
     unload(),
     emqx_trace:clear(),
     ok.