fix: packets_connack_sent is not incremented if the ack_flag field in the CONNACK packet is non-zero

apps/emqx/src/emqx_channel.erl

@@ -2218,6 +2218,7 @@ disconnect_and_shutdown(Reason, Reply, Channel) ->
     NChannel = ensure_disconnected(Reason, Channel),
     shutdown(Reason, Reply, NChannel).
 
+-compile({inline, [sp/1, flag/1]}).
 sp(true) -> 1;
 sp(false) -> 0.
 

apps/emqx/src/emqx_cm.erl

@@ -35,8 +35,6 @@
     insert_channel_info/3
 ]).
 
--export([connection_closed/1]).
-
 -export([
     get_chan_info/1,
     get_chan_info/2,
@@ -192,14 +190,6 @@ do_unregister_channel({_ClientId, ChanPid} = Chan) ->
     ok = emqx_hooks:run('channel.unregistered', [ChanPid]),
     true.
 
--spec connection_closed(emqx_types:clientid()) -> true.
-connection_closed(ClientId) ->
-    connection_closed(ClientId, self()).
-
--spec connection_closed(emqx_types:clientid(), chan_pid()) -> true.
-connection_closed(ClientId, ChanPid) ->
-    ets:delete_object(?CHAN_CONN_TAB, {ClientId, ChanPid}).
-
 %% @doc Get info of a channel.
 -spec get_chan_info(emqx_types:clientid()) -> maybe(emqx_types:infos()).
 get_chan_info(ClientId) ->

apps/emqx/src/emqx_connection.erl

@@ -636,7 +636,6 @@ handle_msg(
 handle_msg({event, disconnected}, State = #state{channel = Channel}) ->
     ClientId = emqx_channel:info(clientid, Channel),
     emqx_cm:set_chan_info(ClientId, info(State)),
-    emqx_cm:connection_closed(ClientId),
     {ok, State};
 handle_msg({event, _Other}, State = #state{channel = Channel}) ->
     ClientId = emqx_channel:info(clientid, Channel),

apps/emqx/src/emqx_metrics.erl

@@ -493,7 +493,7 @@ inc_sent(Packet) ->
     inc('packets.sent'),
     do_inc_sent(Packet).
 
-do_inc_sent(?CONNACK_PACKET(ReasonCode)) ->
+do_inc_sent(?CONNACK_PACKET(ReasonCode, _SessPresent)) ->
     (ReasonCode == ?RC_SUCCESS) orelse inc('packets.connack.error'),
     ((ReasonCode == ?RC_NOT_AUTHORIZED) orelse
         (ReasonCode == ?CONNACK_AUTH)) andalso

apps/emqx/src/emqx_ws_connection.erl

@@ -531,7 +531,6 @@ handle_info({event, connected}, State = #state{channel = Channel}) ->
 handle_info({event, disconnected}, State = #state{channel = Channel}) ->
     ClientId = emqx_channel:info(clientid, Channel),
     emqx_cm:set_chan_info(ClientId, info(State)),
-    emqx_cm:connection_closed(ClientId),
     return(State);
 handle_info({event, _Other}, State = #state{channel = Channel}) ->
     ClientId = emqx_channel:info(clientid, Channel),

apps/emqx/test/emqx_metrics_SUITE.erl

@@ -122,6 +122,17 @@ t_inc_sent(_) ->
     with_metrics_server(
         fun() ->
             ok = emqx_metrics:inc_sent(?CONNACK_PACKET(0)),
+            ok = emqx_metrics:inc_sent(?CONNACK_PACKET(0, 1)),
+            ok = emqx_metrics:inc_sent(
+                ?CONNACK_PACKET(0, 1, #{
+                    'Maximum-Packet-Size' => 1048576,
+                    'Retain-Available' => 1,
+                    'Shared-Subscription-Available' => 1,
+                    'Subscription-Identifier-Available' => 1,
+                    'Topic-Alias-Maximum' => 65535,
+                    'Wildcard-Subscription-Available' => 1
+                })
+            ),
             ok = emqx_metrics:inc_sent(?PUBLISH_PACKET(0, 0)),
             ok = emqx_metrics:inc_sent(?PUBLISH_PACKET(1, 0)),
             ok = emqx_metrics:inc_sent(?PUBLISH_PACKET(2, 0)),
@@ -134,8 +145,8 @@ t_inc_sent(_) ->
             ok = emqx_metrics:inc_sent(?PACKET(?PINGRESP)),
             ok = emqx_metrics:inc_sent(?PACKET(?DISCONNECT)),
             ok = emqx_metrics:inc_sent(?PACKET(?AUTH)),
-            ?assertEqual(13, emqx_metrics:val('packets.sent')),
-            ?assertEqual(1, emqx_metrics:val('packets.connack.sent')),
+            ?assertEqual(15, emqx_metrics:val('packets.sent')),
+            ?assertEqual(3, emqx_metrics:val('packets.connack.sent')),
             ?assertEqual(3, emqx_metrics:val('messages.sent')),
             ?assertEqual(1, emqx_metrics:val('messages.qos0.sent')),
             ?assertEqual(1, emqx_metrics:val('messages.qos1.sent')),

changes/ce/fix-11520.en.md

@@ -0,0 +1 @@
+Fixed issue where packets_connack_sent metric was not incremented on CONNACK packets sent with non-zero ack_flag