fix: add handling of message_validation_failed ctx for rule testing

Before this commit, the backend could not handle the test context for
message_validation_failed events that could be sent from the dashboard
since no handling code for this contexts existed in the backend. This
has now been fixed by adding such handling code.

Fixes:
https://emqx.atlassian.net/browse/EMQX-12354

apps/emqx_rule_engine/src/emqx_rule_api_schema.erl

@@ -307,6 +307,13 @@ fields("ctx_delivery_dropped") ->
         {"from_clientid", sc(binary(), #{desc => ?DESC("event_from_clientid")})},
         {"from_username", sc(binary(), #{desc => ?DESC("event_from_username")})}
         | msg_event_common_fields()
+    ];
+fields("ctx_schema_validation_failed") ->
+    Event = 'schema.validation_failed',
+    [
+        {"event_type", event_type_sc(Event)},
+        {"validation", sc(binary(), #{desc => ?DESC("event_validation")})}
+        | msg_event_common_fields()
     ].
 
 rule_input_message_context() ->
@@ -324,7 +331,8 @@ rule_input_message_context() ->
                 ref("ctx_connack"),
                 ref("ctx_check_authz_complete"),
                 ref("ctx_bridge_mqtt"),
-                ref("ctx_delivery_dropped")
+                ref("ctx_delivery_dropped"),
+                ref("ctx_schema_validation_failed")
             ]),
             #{
                 desc => ?DESC("test_context"),

apps/emqx_rule_engine/src/emqx_rule_sqltester.erl

@@ -197,6 +197,8 @@ is_test_runtime_env() ->
 
 %% Most events have the original `topic' input, but their own topic (i.e.: `$events/...')
 %% is different from `topic'.
+get_in_topic(#{event_type := schema_validation_failed}) ->
+    <<"$events/schema_validation_failed">>;
 get_in_topic(Context) ->
     case maps:find(event_topic, Context) of
         {ok, EventTopic} ->

apps/emqx_rule_engine/test/emqx_rule_engine_api_rule_test_SUITE.erl

@@ -214,6 +214,21 @@ t_ctx_delivery_dropped(_) ->
     Expected = check_result([from_clientid, from_username, reason, qos, topic], [], Context),
     do_test(SQL, Context, Expected).
 
+t_ctx_schema_validation_failed(_) ->
+    SQL =
+        <<"SELECT validation FROM \"$events/schema_validation_failed\"">>,
+    Context = #{
+        <<"clientid">> => <<"c_emqx">>,
+        <<"event_type">> => <<"schema_validation_failed">>,
+        <<"payload">> => <<"{\"msg\": \"hello\"}">>,
+        <<"qos">> => 1,
+        <<"topic">> => <<"t/a">>,
+        <<"username">> => <<"u_emqx">>,
+        <<"validation">> => <<"m">>
+    },
+    Expected = check_result([validation], [], Context),
+    do_test(SQL, Context, Expected).
+
 t_mongo_date_function_should_return_string_in_test_env(_) ->
     SQL =
         <<"SELECT mongo_date() as mongo_date FROM \"$events/client_check_authz_complete\"">>,

rel/i18n/emqx_rule_api_schema.hocon

@@ -360,6 +360,12 @@ event_username.desc:
 event_username.label:
 """Username"""
 
+event_validation.desc:
+"""Validation"""
+
+event_validation.label:
+"""Validation"""
+
 root_rule_info.desc:
 """Schema for rule info"""