Merge pull request #7309 from HJianBo/send_disconnect_pkt_while_kicked

fix(channel): send DISCONNECT packet if connection has been kicked

CHANGES-4.3.md

@@ -49,6 +49,7 @@ File format:
 * Fix errno=13 'Permission denied' Cannot create FIFO boot error in Amazon Linux 2022 (el8 package)
 * Fix user or appid created, name only allow `^[A-Za-z]+[A-Za-z0-9-_]*$`
 * Fix subscribe http api crash by bad_qos `/mqtt/subscribe`,`/mqtt/subscribe_batch`.
+* Send DISCONNECT packet with reason code 0x98 if connection has been kicked [#7309]
 
 ## v4.3.12
 ### Important changes

src/emqx_channel.erl

@@ -924,9 +924,23 @@ return_sub_unsub_ack(Packet, Channel) ->
       -> {reply, Reply :: term(), channel()}
        | {shutdown, Reason :: term(), Reply :: term(), channel()}
        | {shutdown, Reason :: term(), Reply :: term(), emqx_types:packet(), channel()}).
-handle_call(kick, Channel) ->
+handle_call(kick, Channel = #channel{
-    Channel1 = ensure_disconnected(kicked, Channel),
+                               conn_state = ConnState,
-    disconnect_and_shutdown(kicked, ok, Channel1);
+                               will_msg = WillMsg,
+                               conninfo = #{proto_ver := ProtoVer}
+                              }) ->
+    (WillMsg =/= undefined) andalso publish_will_msg(WillMsg),
+    Channel1 = case ConnState of
+                   connected -> ensure_disconnected(kicked, Channel);
+                   _ -> Channel
+               end,
+    case ProtoVer == ?MQTT_PROTO_V5 andalso ConnState == connected of
+        true ->
+            shutdown(kicked, ok,
+                     ?DISCONNECT_PACKET(?RC_ADMINISTRATIVE_ACTION), Channel1);
+        _ ->
+            shutdown(kicked, ok, Channel1)
+    end;
 
 handle_call(discard, Channel) ->
     disconnect_and_shutdown(discarded, ok, Channel);
@@ -984,7 +998,7 @@ handle_info({sock_closed, Reason}, Channel =
                      clientinfo = ClientInfo = #{zone := Zone}}) ->
     emqx_zone:enable_flapping_detect(Zone)
         andalso emqx_flapping:detect(ClientInfo),
-    Channel1 = ensure_disconnected(Reason, mabye_publish_will_msg(Channel)),
+    Channel1 = ensure_disconnected(Reason, maybe_publish_will_msg(Channel)),
     case maybe_shutdown(Reason, Channel1) of
         {ok, Channel2} -> {ok, {event, disconnected}, Channel2};
         Shutdown -> Shutdown
@@ -1645,9 +1659,9 @@ ensure_disconnected(Reason, Channel = #channel{conninfo = ConnInfo,
 %%--------------------------------------------------------------------
 %% Maybe Publish will msg
 
-mabye_publish_will_msg(Channel = #channel{will_msg = undefined}) ->
+maybe_publish_will_msg(Channel = #channel{will_msg = undefined}) ->
     Channel;
-mabye_publish_will_msg(Channel = #channel{will_msg = WillMsg}) ->
+maybe_publish_will_msg(Channel = #channel{will_msg = WillMsg}) ->
     case will_delay_interval(WillMsg) of
         0 ->
             ok = publish_will_msg(WillMsg),
@@ -1657,10 +1671,10 @@ mabye_publish_will_msg(Channel = #channel{will_msg = WillMsg}) ->
     end.
 
 will_delay_interval(WillMsg) ->
-    maps:get('Will-Delay-Interval', emqx_message:get_header(properties, WillMsg), 0).
+    maps:get('Will-Delay-Interval',
+             emqx_message:get_header(properties, WillMsg, #{}), 0).
 
 publish_will_msg(Msg) ->
-    %% TODO check if we should discard result here
     _ = emqx_broker:publish(Msg),
     ok.
 

test/emqx_channel_SUITE.erl

@@ -577,7 +577,32 @@ t_handle_out_unexpected(_) ->
 %%--------------------------------------------------------------------
 
 t_handle_call_kick(_) ->
-    {shutdown, kicked, ok, _Chan} = emqx_channel:handle_call(kick, channel()).
+    Channelv5 = channel(),
+    Channelv4 = v4(Channelv5),
+    {shutdown, kicked, ok, _} = emqx_channel:handle_call(kick, Channelv4),
+    {shutdown, kicked, ok,
+     ?DISCONNECT_PACKET(?RC_ADMINISTRATIVE_ACTION),
+     _} = emqx_channel:handle_call(kick, Channelv5),
+
+    DisconnectedChannelv5 = channel(#{conn_state => disconnected}),
+    DisconnectedChannelv4 = v4(DisconnectedChannelv5),
+
+    {shutdown, kicked, ok, _} = emqx_channel:handle_call(kick, DisconnectedChannelv5),
+    {shutdown, kicked, ok, _} = emqx_channel:handle_call(kick, DisconnectedChannelv4).
+
+t_handle_kicked_publish_will_msg(_) ->
+    Self = self(),
+    ok = meck:expect(emqx_broker, publish, fun(M) -> Self ! {pub, M} end),
+
+    Msg = emqx_message:make(test, <<"will_topic">>, <<"will_payload">>),
+
+    {shutdown, kicked, ok,
+     ?DISCONNECT_PACKET(?RC_ADMINISTRATIVE_ACTION),
+     _} = emqx_channel:handle_call(kick, channel(#{will_msg => Msg})),
+    receive
+        {pub, Msg} -> ok
+    after 200 -> exit(will_message_not_published)
+    end.
 
 t_handle_call_discard(_) ->
     Packet = ?DISCONNECT_PACKET(?RC_SESSION_TAKEN_OVER),
@@ -858,3 +883,11 @@ session(InitFields) when is_map(InitFields) ->
 quota() ->
     emqx_limiter:init(zone, [{conn_messages_routing, {5, 1}},
                              {overall_messages_routing, {10, 1}}]).
+
+v4(Channel) ->
+    ConnInfo = emqx_channel:info(conninfo, Channel),
+    emqx_channel:set_field(
+      conninfo,
+      maps:put(proto_ver, ?MQTT_PROTO_V4, ConnInfo),
+      Channel
+     ).