fix(connector): add testcase for binding ingress mqtt bridge to rules

apps/emqx_bridge/src/emqx_bridge.erl

@@ -81,12 +81,12 @@ on_message_publish(Message = #message{topic = Topic, flags = Flags}) ->
     case maps:get(sys, Flags, false) of
         false ->
             Msg = emqx_rule_events:eventmsg_publish(Message),
-            send_to_egress_matched_bridges(Topic, Msg);
+            send_to_matched_egress_bridges(Topic, Msg);
         true -> ok
     end,
     {ok, Message}.
 
-send_to_egress_matched_bridges(Topic, Msg) ->
+send_to_matched_egress_bridges(Topic, Msg) ->
     lists:foreach(fun (Id) ->
         try send_message(Id, Msg) of
             ok -> ok;

apps/emqx_connector/src/mqtt/emqx_connector_mqtt_mod.erl

@@ -165,7 +165,8 @@ handle_publish(Msg, undefined) ->
     ?SLOG(error, #{msg => "cannot_publish_to_local_broker_as"
                           "_'ingress'_is_not_configured",
                    message => Msg});
-handle_publish(Msg, Vars) ->
+handle_publish(Msg0, Vars) ->
+    Msg = format_msg_received(Msg0),
     ?SLOG(debug, #{msg => "publish_to_local_broker",
                    message => Msg, vars => Vars}),
     case Vars of
@@ -173,27 +174,11 @@ handle_publish(Msg, Vars) ->
             _ = erlang:apply(Mod, Func, [Msg | Args]);
         _ -> ok
     end,
-    maybe_publish_to_local_broker(Msg, Vars).
+    maybe_publish_to_local_broker(Msg0, Vars).
 
 handle_disconnected(Reason, Parent) ->
     Parent ! {disconnected, self(), Reason}.
 
-maybe_publish_to_local_broker(#{topic := Topic} = Msg, #{remote_topic := SubTopic} = Vars) ->
-    case maps:get(local_topic, Vars, undefined) of
-        undefined ->
-            %% local topic is not set, discard it
-            ok;
-        _ ->
-            case emqx_topic:match(Topic, SubTopic) of
-                true ->
-                    _ = emqx_broker:publish(emqx_connector_mqtt_msg:to_broker_msg(Msg, Vars)),
-                    ok;
-                false ->
-                    ?SLOG(warning, #{msg => "discard_message_as_topic_not_matched",
-                        message => Msg, subscribed => SubTopic, got_topic => Topic})
-            end
-    end.
-
 make_hdlr(Parent, Vars) ->
     #{puback => {fun ?MODULE:handle_puback/2, [Parent]},
       publish => {fun ?MODULE:handle_publish/2, [Vars]},
@@ -209,3 +194,45 @@ sub_remote_topics(ClientPid, #{remote_topic := FromTopic, remote_qos := QoS}) ->
 
 process_config(Config) ->
     maps:without([conn_type, address, receive_mountpoint, subscriptions, name], Config).
+
+maybe_publish_to_local_broker(#{topic := Topic} = Msg, #{remote_topic := SubTopic} = Vars) ->
+    case maps:get(local_topic, Vars, undefined) of
+        undefined ->
+            ok; %% local topic is not set, discard it
+        _ ->
+            case emqx_topic:match(Topic, SubTopic) of
+                true ->
+                    _ = emqx_broker:publish(emqx_connector_mqtt_msg:to_broker_msg(Msg, Vars)),
+                    ok;
+                false ->
+                    ?SLOG(warning, #{msg => "discard_message_as_topic_not_matched",
+                        message => Msg, subscribed => SubTopic, got_topic => Topic})
+            end
+    end.
+
+format_msg_received(#{dup := Dup, payload := Payload, properties := Props,
+        qos := QoS, retain := Retain, topic := Topic}) ->
+    #{event => '$bridges/mqtt',
+      id => emqx_guid:to_hexstr(emqx_guid:gen()),
+      payload => Payload,
+      topic => Topic,
+      qos => QoS,
+      dup => Dup,
+      retain => Retain,
+      pub_props => printable_maps(Props),
+      timestamp => erlang:system_time(millisecond)
+    }.
+
+printable_maps(undefined) -> #{};
+printable_maps(Headers) ->
+    maps:fold(
+        fun ('User-Property', V0, AccIn) when is_list(V0) ->
+                AccIn#{
+                    'User-Property' => maps:from_list(V0),
+                    'User-Property-Pairs' => [#{
+                        key => Key,
+                        value => Value
+                     } || {Key, Value} <- V0]
+                };
+            (K, V0, AccIn) -> AccIn#{K => V0}
+        end, #{}, Headers).

apps/emqx_connector/src/mqtt/emqx_connector_mqtt_msg.erl

@@ -78,10 +78,9 @@ to_remote_msg(#message{topic = Topic} = Msg, #{mountpoint := Mountpoint}) ->
     Msg#message{topic = topic(Mountpoint, Topic)}.
 
 %% published from remote node over a MQTT connection
-to_broker_msg(#{dup := Dup, properties := Props} = MapMsg0,
+to_broker_msg(#{dup := Dup, properties := Props} = MapMsg,
             #{local_topic := TopicToken, payload := PayloadToken,
               local_qos := QoSToken, retain := RetainToken, mountpoint := Mountpoint}) ->
-    MapMsg = format_msg_received(MapMsg0),
     Topic = replace_vars_in_str(TopicToken, MapMsg),
     Payload = process_payload(PayloadToken, MapMsg),
     QoS = replace_simple_var(QoSToken, MapMsg),
@@ -90,33 +89,6 @@ to_broker_msg(#{dup := Dup, properties := Props} = MapMsg0,
         emqx_message:set_flags(#{dup => Dup, retain => Retain},
             emqx_message:make(bridge, QoS, topic(Mountpoint, Topic), Payload))).
 
-format_msg_received(#{dup := Dup, payload := Payload, properties := Props,
-        qos := QoS, retain := Retain, topic := Topic}) ->
-    #{event => '$bridges/mqtt',
-      id => emqx_guid:to_hexstr(emqx_guid:gen()),
-      payload => Payload,
-      topic => Topic,
-      qos => QoS,
-      flags => #{dup => Dup, retain => Retain},
-      pub_props => printable_maps(Props),
-      timestamp => erlang:system_time(millisecond),
-      node => node()
-    }.
-
-printable_maps(undefined) -> #{};
-printable_maps(Headers) ->
-    maps:fold(
-        fun ('User-Property', V0, AccIn) when is_list(V0) ->
-                AccIn#{
-                    'User-Property' => maps:from_list(V0),
-                    'User-Property-Pairs' => [#{
-                        key => Key,
-                        value => Value
-                     } || {Key, Value} <- V0]
-                };
-            (K, V0, AccIn) -> AccIn#{K => V0}
-        end, #{}, Headers).
-
 process_payload([], Msg) ->
     emqx_json:encode(Msg);
 process_payload(Tks, Msg) ->

apps/emqx_connector/test/emqx_connector_api_SUITE.erl

@@ -22,7 +22,10 @@
 -include_lib("eunit/include/eunit.hrl").
 -include_lib("common_test/include/ct.hrl").
 
--define(CONF_DEFAULT, <<"connectors: {}">>).
+%% output functions
+-export([ inspect/3
+        ]).
+
 -define(BRIDGE_CONF_DEFAULT, <<"bridges: {}">>).
 -define(CONNECTR_TYPE, <<"mqtt">>).
 -define(CONNECTR_NAME, <<"test_connector">>).
@@ -67,6 +70,9 @@
       <<"failed">> := FAILED, <<"rate">> := SPEED,
       <<"rate_last5m">> := SPEED5M, <<"rate_max">> := SPEEDMAX}).
 
+inspect(Selected, _Envs, _Args) ->
+    persistent_term:put(?MODULE, #{inspect => Selected}).
+
 all() ->
     emqx_common_test_helpers:all(?MODULE).
 
@@ -89,13 +95,15 @@ init_per_suite(Config) ->
     %% some testcases (may from other app) already get emqx_connector started
     _ = application:stop(emqx_resource),
     _ = application:stop(emqx_connector),
-    ok = emqx_common_test_helpers:start_apps([emqx_connector, emqx_bridge, emqx_dashboard]),
+    ok = emqx_common_test_helpers:start_apps([emqx_rule_engine, emqx_connector,
-    ok = emqx_config:init_load(emqx_connector_schema, ?CONF_DEFAULT),
+        emqx_bridge, emqx_dashboard]),
+    ok = emqx_config:init_load(emqx_connector_schema, <<"connectors: {}">>),
+    ok = emqx_config:init_load(emqx_rule_engine_schema, <<"rule_engine {rules {}}">>),
     ok = emqx_config:init_load(emqx_bridge_schema, ?BRIDGE_CONF_DEFAULT),
     Config.
 
 end_per_suite(_Config) ->
-    emqx_common_test_helpers:stop_apps([emqx_connector, emqx_bridge, emqx_dashboard]),
+    emqx_common_test_helpers:stop_apps([emqx_rule_engine, emqx_connector, emqx_bridge, emqx_dashboard]),
     ok.
 
 init_per_testcase(_, Config) ->
@@ -223,7 +231,6 @@ t_mqtt_conn_bridge_ingress(_) ->
     %% PUBLISH a message to the 'remote' broker, as we have only one broker,
     %% the remote broker is also the local one.
     emqx:publish(emqx_message:make(RemoteTopic, Payload)),
-
     %% we should receive a message on the local broker, with specified topic
     ?assert(
         receive
@@ -435,6 +442,71 @@ t_mqtt_conn_testing(_) ->
             <<"name">> => ?BRIDGE_NAME_EGRESS
         }).
 
+t_ingress_mqtt_bridge_with_rules(_) ->
+    {ok, 201, Connector} = request(post, uri(["connectors"]),
+        ?MQTT_CONNECOTR(<<"user1">>)#{ <<"type">> => ?CONNECTR_TYPE
+                               , <<"name">> => ?CONNECTR_NAME
+                               }),
+    #{ <<"id">> := ConnctorID } = jsx:decode(Connector),
+
+    {ok, 201, Bridge} = request(post, uri(["bridges"]),
+        ?MQTT_BRIDGE_INGRESS(ConnctorID)#{
+            <<"type">> => ?CONNECTR_TYPE,
+            <<"name">> => ?BRIDGE_NAME_INGRESS
+        }),
+    #{ <<"id">> := BridgeIDIngress } = jsx:decode(Bridge),
+
+    {ok, 201, Rule} = request(post, uri(["rules"]),
+        #{<<"name">> => <<"A rule get messages from a source mqtt bridge">>,
+          <<"enable">> => true,
+          <<"outputs">> => [#{<<"function">> => "emqx_connector_api_SUITE:inspect"}],
+          <<"sql">> => <<"SELECT * from \"$bridges/", BridgeIDIngress/binary, "\"">>
+        }),
+    #{<<"id">> := RuleId} = jsx:decode(Rule),
+
+    %% we now test if the bridge works as expected
+
+    RemoteTopic = <<"remote_topic/1">>,
+    LocalTopic = <<"local_topic/", RemoteTopic/binary>>,
+    Payload = <<"hello">>,
+    emqx:subscribe(LocalTopic),
+    %% PUBLISH a message to the 'remote' broker, as we have only one broker,
+    %% the remote broker is also the local one.
+    emqx:publish(emqx_message:make(RemoteTopic, Payload)),
+    %% we should receive a message on the local broker, with specified topic
+    ?assert(
+        receive
+            {deliver, LocalTopic, #message{payload = Payload}} ->
+                ct:pal("local broker got message: ~p on topic ~p", [Payload, LocalTopic]),
+                true;
+            Msg ->
+                ct:pal("Msg: ~p", [Msg]),
+                false
+        after 100 ->
+            false
+        end),
+    %% and also the rule should be matched, with matched + 1:
+    {ok, 200, Rule1} = request(get, uri(["rules", RuleId]), []),
+    #{ <<"id">> := RuleId
+     , <<"metrics">> := #{<<"matched">> := 1}
+     } = jsx:decode(Rule1),
+    %% we also check if the outputs of the rule is triggered
+    ?assertMatch(#{inspect := #{
+        event := '$bridges/mqtt',
+        id := MsgId,
+        payload := Payload,
+        topic := RemoteTopic,
+        qos := 0,
+        dup := false,
+        retain := false,
+        pub_props := #{},
+        timestamp := _
+    }} when is_binary(MsgId), persistent_term:get(?MODULE)),
+
+    {ok, 204, <<>>} = request(delete, uri(["rules", RuleId]), []),
+    {ok, 204, <<>>} = request(delete, uri(["bridges", BridgeIDIngress]), []),
+    {ok, 204, <<>>} = request(delete, uri(["connectors", ConnctorID]), []).
+
 %%--------------------------------------------------------------------
 %% HTTP Request
 %%--------------------------------------------------------------------