fix: redis connector should not timeout because no username and password

A redis connector of type single or sentinel always got a timeout error
when doing the connector test in the dashboard if no username or
password was provided. This commit makes sure that the user instead get
an informative error message. Additionally, this commit adds more
more error information for all redis connector types.

Fixes:
https://emqx.atlassian.net/browse/EMQX-12557

apps/emqx_bridge/test/emqx_bridge_v2_testlib.erl

@@ -945,6 +945,7 @@ t_on_get_status(Config, Opts) ->
     ProxyHost = ?config(proxy_host, Config),
     ProxyName = ?config(proxy_name, Config),
     FailureStatus = maps:get(failure_status, Opts, disconnected),
+    NormalStatus = maps:get(normal_status, Opts, connected),
     ?assertMatch({ok, _}, create_bridge(Config)),
     ResourceId = resource_id(Config),
     %% Since the connection process is async, we give it some time to
@@ -952,7 +953,7 @@ t_on_get_status(Config, Opts) ->
     ?retry(
         _Sleep = 1_000,
         _Attempts = 20,
-        ?assertEqual({ok, connected}, emqx_resource_manager:health_check(ResourceId))
+        ?assertEqual({ok, NormalStatus}, emqx_resource_manager:health_check(ResourceId))
     ),
     case ProxyHost of
         undefined ->
@@ -971,7 +972,7 @@ t_on_get_status(Config, Opts) ->
             ?retry(
                 _Sleep = 1_000,
                 _Attempts = 20,
-                ?assertEqual({ok, connected}, emqx_resource_manager:health_check(ResourceId))
+                ?assertEqual({ok, NormalStatus}, emqx_resource_manager:health_check(ResourceId))
             )
     end,
     ok.

apps/emqx_bridge_redis/test/emqx_bridge_v2_redis_SUITE.erl

@@ -19,6 +19,7 @@
 
 -include_lib("eunit/include/eunit.hrl").
 -include_lib("common_test/include/ct.hrl").
+-include_lib("snabbkaffe/include/snabbkaffe.hrl").
 
 -define(BRIDGE_TYPE, redis).
 -define(BRIDGE_TYPE_BIN, <<"redis">>).
@@ -46,6 +47,7 @@ matrix_testcases() ->
         t_start_stop,
         t_create_via_http,
         t_on_get_status,
+        t_on_get_status_no_username_pass,
         t_sync_query,
         t_map_to_redis_hset_args
     ].
@@ -325,6 +327,43 @@ t_on_get_status(Config) when is_list(Config) ->
     emqx_bridge_v2_testlib:t_on_get_status(Config, #{failure_status => connecting}),
     ok.
 
+t_on_get_status_no_username_pass(matrix) ->
+    {on_get_status, [
+        [single, tcp],
+        [cluster, tcp],
+        [sentinel, tcp]
+    ]};
+t_on_get_status_no_username_pass(Config0) when is_list(Config0) ->
+    ConnectorConfig0 = ?config(connector_config, Config0),
+    ConnectorConfig1 = emqx_utils_maps:deep_put(
+        [<<"parameters">>, <<"password">>], ConnectorConfig0, <<"">>
+    ),
+    ConnectorConfig2 = emqx_utils_maps:deep_put(
+        [<<"parameters">>, <<"username">>], ConnectorConfig1, <<"">>
+    ),
+    Config1 = proplists:delete(connector_config, Config0),
+    Config2 = [{connector_config, ConnectorConfig2} | Config1],
+    ?check_trace(
+        emqx_bridge_v2_testlib:t_on_get_status(
+            Config2,
+            #{
+                failure_status => disconnected,
+                normal_status => disconnected
+            }
+        ),
+        fun(ok, Trace) ->
+            case ?config(redis_type, Config2) of
+                single ->
+                    ?assertMatch([_ | _], ?of_kind(emqx_redis_auth_required_error, Trace));
+                sentinel ->
+                    ?assertMatch([_ | _], ?of_kind(emqx_redis_auth_required_error, Trace));
+                cluster ->
+                    ok
+            end
+        end
+    ),
+    ok.
+
 t_sync_query(matrix) ->
     {sync_query, [
         [single, tcp],

apps/emqx_redis/src/emqx_redis.app.src

@@ -1,6 +1,6 @@
 {application, emqx_redis, [
     {description, "EMQX Redis Database Connector"},
-    {vsn, "0.1.5"},
+    {vsn, "0.1.6"},
     {registered, []},
     {applications, [
         kernel,

apps/emqx_redis/src/emqx_redis.erl

@@ -19,6 +19,7 @@
 -include_lib("typerefl/include/types.hrl").
 -include_lib("hocon/include/hoconsc.hrl").
 -include_lib("emqx/include/logger.hrl").
+-include_lib("snabbkaffe/include/snabbkaffe.hrl").
 
 -export([namespace/0, roots/0, fields/1, redis_fields/0, desc/1]).
 
@@ -231,7 +232,7 @@ is_unrecoverable_error({error, invalid_cluster_command}) ->
 is_unrecoverable_error(_) ->
     false.
 
-on_get_status(_InstId, #{type := cluster, pool_name := PoolName}) ->
+on_get_status(_InstId, #{type := cluster, pool_name := PoolName} = State) ->
     case eredis_cluster:pool_exists(PoolName) of
         true ->
             %% eredis_cluster has null slot even pool_exists when emqx start before redis cluster.
@@ -242,24 +243,57 @@ on_get_status(_InstId, #{type := cluster, pool_name := PoolName}) ->
                 [] ->
                     disconnected;
                 [_ | _] ->
-                    Health = eredis_cluster:ping_all(PoolName),
-                    status_result(Health)
+                    do_cluster_status_check(PoolName, State)
             end;
         false ->
             disconnected
     end;
-on_get_status(_InstId, #{pool_name := PoolName}) ->
-    Health = emqx_resource_pool:health_check_workers(PoolName, fun ?MODULE:do_get_status/1),
-    status_result(Health).
+on_get_status(_InstId, #{pool_name := PoolName} = State) ->
+    Timeout = 1000,
+    Workers = [Worker || {_WorkerName, Worker} <- ecpool:workers(PoolName)],
+    DoPerWorker =
+        fun(Worker) ->
+            case ecpool_worker:client(Worker) of
+                {ok, Conn} ->
+                    erlang:is_process_alive(Conn) andalso
+                        ecpool_worker:exec(Worker, fun ?MODULE:do_get_status/1, Timeout);
+                Error ->
+                    Error
+            end
+        end,
+    {ok, Results} =
+        try
+            {ok, emqx_utils:pmap(DoPerWorker, Workers, Timeout)}
+        catch
+            exit:timeout ->
+                {error, timeout}
+        end,
+    sum_worker_results(Results, State).
 
-do_get_status(Conn) ->
-    case eredis:q(Conn, ["PING"]) of
-        {ok, _} -> true;
-        _ -> false
-    end.
+do_cluster_status_check(Pool, State) ->
+    Pongs = eredis_cluster:qa(Pool, [<<"PING">>]),
+    sum_worker_results(Pongs, State).
 
-status_result(_Status = true) -> connected;
-status_result(_Status = false) -> connecting.
+do_get_status(Conn) ->
+    eredis:q(Conn, ["PING"]).
+
+sum_worker_results([], _State) ->
+    connected;
+sum_worker_results([{error, <<"NOAUTH Authentication required.">>} = Error | _Rest], State) ->
+    ?tp(emqx_redis_auth_required_error, #{}),
+    %% This requires user action to fix so we set the status to disconnected
+    {disconnected, State, Error};
+sum_worker_results([{ok, _} | Rest], State) ->
+    sum_worker_results(Rest, State);
+sum_worker_results([Error | _Rest], State) ->
+    ?SLOG(
+        warning,
+        #{
+            msg => "emqx_redis_check_status_error",
+            error => Error
+        }
+    ),
+    {connecting, State, Error}.
 
 do_cmd(PoolName, cluster, {cmd, Command}) ->
     eredis_cluster:q(PoolName, Command);