fix(ft): report ft assemble status from a dedicated process

Previously, the status was monitored by the channel itself.
If channel disconnected before the assemble was completed,
the status message was lost (not sent to the resonse topic)

apps/emqx_ft/src/emqx_ft.app.src

@@ -1,6 +1,6 @@
 {application, emqx_ft, [
     {description, "EMQX file transfer over MQTT"},
-    {vsn, "0.1.14"},
+    {vsn, "0.1.15"},
     {registered, []},
     {mod, {emqx_ft_app, []}},
     {applications, [

apps/emqx_ft/src/emqx_ft.erl

@@ -30,10 +30,7 @@
 
 -export([
     on_message_publish/1,
-    on_message_puback/4,
+    on_message_puback/4
-    on_client_timeout/3,
-    on_process_down/4,
-    on_channel_unregistered/1
 ]).
 
 -export([
@@ -88,8 +85,6 @@
     checksum => checksum()
 }.
 
--define(FT_EVENT(EVENT), {?MODULE, EVENT}).
-
 -define(ACK_AND_PUBLISH(Result), {true, Result}).
 -define(ACK(Result), {false, Result}).
 -define(DELAY_ACK, delay).
@@ -100,21 +95,11 @@
 
 hook() ->
     ok = emqx_hooks:put('message.publish', {?MODULE, on_message_publish, []}, ?HP_LOWEST),
-    ok = emqx_hooks:put('message.puback', {?MODULE, on_message_puback, []}, ?HP_LOWEST),
+    ok = emqx_hooks:put('message.puback', {?MODULE, on_message_puback, []}, ?HP_LOWEST).
-    ok = emqx_hooks:put('client.timeout', {?MODULE, on_client_timeout, []}, ?HP_LOWEST),
-    ok = emqx_hooks:put(
-        'client.monitored_process_down', {?MODULE, on_process_down, []}, ?HP_LOWEST
-    ),
-    ok = emqx_hooks:put(
-        'cm.channel.unregistered', {?MODULE, on_channel_unregistered, []}, ?HP_LOWEST
-    ).
 
 unhook() ->
     ok = emqx_hooks:del('message.publish', {?MODULE, on_message_publish}),
-    ok = emqx_hooks:del('message.puback', {?MODULE, on_message_puback}),
+    ok = emqx_hooks:del('message.puback', {?MODULE, on_message_puback}).
-    ok = emqx_hooks:del('client.timeout', {?MODULE, on_client_timeout}),
-    ok = emqx_hooks:del('client.monitored_process_down', {?MODULE, on_process_down}),
-    ok = emqx_hooks:del('cm.channel.unregistered', {?MODULE, on_channel_unregistered}).
 
 %%--------------------------------------------------------------------
 %% API
@@ -152,40 +137,6 @@ on_message_puback(PacketId, #message{from = From, topic = Topic} = Msg, _PubRes,
             ignore
     end.
 
-on_channel_unregistered(ChannelPid) ->
-    ok = emqx_ft_async_reply:deregister_all(ChannelPid).
-
-on_client_timeout(_TRef0, ?FT_EVENT({MRef, TopicReplyData}), Acc) ->
-    _ = erlang:demonitor(MRef, [flush]),
-    Result = {error, timeout},
-    _ = publish_response(Result, TopicReplyData),
-    case emqx_ft_async_reply:take_by_mref(MRef) of
-        {ok, undefined, _TRef1, _TopicReplyData} ->
-            {stop, Acc};
-        {ok, PacketId, _TRef1, _TopicReplyData} ->
-            {stop, [?REPLY_OUTGOING(?PUBACK_PACKET(PacketId, result_to_rc(Result))) | Acc]};
-        not_found ->
-            {ok, Acc}
-    end;
-on_client_timeout(_TRef, _Event, Acc) ->
-    {ok, Acc}.
-
-on_process_down(MRef, _Pid, DownReason, Acc) ->
-    case emqx_ft_async_reply:take_by_mref(MRef) of
-        {ok, PacketId, TRef, TopicReplyData} ->
-            _ = emqx_utils:cancel_timer(TRef),
-            Result = down_reason_to_result(DownReason),
-            _ = publish_response(Result, TopicReplyData),
-            case PacketId of
-                undefined ->
-                    {stop, Acc};
-                _ ->
-                    {stop, [?REPLY_OUTGOING(?PUBACK_PACKET(PacketId, result_to_rc(Result))) | Acc]}
-            end;
-        not_found ->
-            {ok, Acc}
-    end.
-
 %%--------------------------------------------------------------------
 %% Handlers for transfer messages
 %%--------------------------------------------------------------------
@@ -253,7 +204,7 @@ on_init(#{packet_id := PacketId}, Msg, Transfer, Meta) ->
         filemeta => Meta
     }),
     %% Currently synchronous.
-    %% If we want to make it async, we need to use `emqx_ft_async_reply`,
+    %% If we want to make it async, we need to use `with_responder`,
     %% like in `on_fin`.
     ?ACK_AND_PUBLISH(store_filemeta(Transfer, Meta)).
 
@@ -271,11 +222,13 @@ on_segment(#{packet_id := PacketId}, Msg, Transfer, Offset, Checksum) ->
     }),
     Segment = {Offset, Msg#message.payload},
     %% Currently synchronous.
-    %% If we want to make it async, we need to use `emqx_ft_async_reply`,
+    %% If we want to make it async, we need to use `with_responder`,
     %% like in `on_fin`.
     ?ACK_AND_PUBLISH(store_segment(Transfer, Segment)).
 
-on_fin(#{packet_id := PacketId} = TopicReplyData, Msg, Transfer, FinalSize, FinalChecksum) ->
+on_fin(
+    #{packet_id := PacketId, mode := Mode} = TopicReplyData, Msg, Transfer, FinalSize, FinalChecksum
+) ->
     ?tp(info, "file_transfer_fin", #{
         mqtt_msg => Msg,
         packet_id => PacketId,
@@ -283,39 +236,78 @@ on_fin(#{packet_id := PacketId} = TopicReplyData, Msg, Transfer, FinalSize, Fina
         final_size => FinalSize,
         checksum => FinalChecksum
     }),
-    %% TODO: handle checksum? Do we need it?
+    FinPacketKey = {self(), PacketId},
-    with_new_packet(
+    Callback = fun(Result) ->
-        TopicReplyData,
+        on_complete("assemble", TopicReplyData, FinPacketKey, Transfer, Result)
-        PacketId,
+    end,
-        fun() ->
+    with_responder(FinPacketKey, Callback, emqx_ft_conf:assemble_timeout(), fun() ->
-            case assemble(Transfer, FinalSize, FinalChecksum) of
+        case assemble(Transfer, FinalSize, FinalChecksum) of
-                ok ->
+            %% Assembling completed, ack through the responder right away
-                    ?ACK_AND_PUBLISH(ok);
+            ok ->
-                %% Assembling started, packet will be acked/replied by monitor or timeout
+                emqx_ft_responder:ack(FinPacketKey, ok),
-                {async, Pid} ->
+                ?DELAY_ACK;
-                    register_async_worker(Pid, TopicReplyData);
+            %% Assembling started, packet will be acked by the responder
-                {error, _} = Error ->
+            {async, Pid} ->
-                    ?ACK_AND_PUBLISH(Error)
+                ok = emqx_ft_responder:kickoff(FinPacketKey, Pid),
-            end
+                ack_if_async(Mode);
+            %% Assembling failed, ack through the responder
+            {error, _} = Error ->
+                emqx_ft_responder:ack(FinPacketKey, Error),
+                ?DELAY_ACK
         end
-    ).
+    end).
 
-register_async_worker(Pid, #{mode := Mode, packet_id := PacketId} = TopicReplyData) ->
+with_responder(Key, Callback, Timeout, CriticalSection) ->
-    MRef = erlang:monitor(process, Pid),
+    case emqx_ft_responder:start(Key, Callback, Timeout) of
-    TRef = erlang:start_timer(
+        %% We have new packet
-        emqx_ft_conf:assemble_timeout(), self(), ?FT_EVENT({MRef, TopicReplyData})
+        {ok, _} ->
-    ),
+            CriticalSection();
-    case Mode of
+        %% Packet already received.
-        async ->
+        %% Since we are still handling the previous one,
-            ok = emqx_ft_async_reply:register(MRef, TRef, TopicReplyData),
+        %% we probably have retransmit here
-            ok = emqx_ft_storage:kickoff(Pid),
+        {error, {already_started, _}} ->
-            ?ACK(ok);
-        sync ->
-            ok = emqx_ft_async_reply:register(PacketId, MRef, TRef, TopicReplyData),
-            ok = emqx_ft_storage:kickoff(Pid),
             ?DELAY_ACK
     end.
 
+ack_if_async(sync) ->
+    ?DELAY_ACK;
+ack_if_async(async) ->
+    ?ACK(ok).
+
+on_complete(Op, #{mode := Mode} = TopicReplyData, {ChanPid, PacketId}, Transfer, ResponderResult) ->
+    ?tp(debug, "on_complete", #{
+        operation => Op,
+        packet_id => PacketId,
+        transfer => Transfer
+    }),
+    Result =
+        case ResponderResult of
+            {RespMode, ok} when RespMode == ack orelse RespMode == down ->
+                ok;
+            {RespMode, {error, _} = Reason} when RespMode == ack orelse RespMode == down ->
+                ?tp(error, Op ++ "_failed", #{
+                    transfer => Transfer,
+                    reason => Reason
+                }),
+                Reason;
+            timeout ->
+                ?tp(error, Op ++ "_timed_out", #{
+                    transfer => Transfer
+                }),
+                {error, timeout}
+        end,
+    NeedAck =
+        case {ResponderResult, Mode} of
+            {{down, _}, async} -> false;
+            {timeout, async} -> false;
+            _ -> true
+        end,
+    NeedAck andalso ack_packet(ChanPid, PacketId, Result),
+    _ = publish_response(Result, TopicReplyData).
+
+ack_packet(ChanPid, PacketId, Result) ->
+    erlang:send(ChanPid, {puback, PacketId, [], result_to_rc(Result)}).
+
 topic_reply_data(Mode, From, PacketId, #message{topic = Topic, headers = Headers}) ->
     Props = maps:get(properties, Headers, #{}),
     #{
@@ -483,19 +475,3 @@ clientid_to_binary(A) when is_atom(A) ->
     atom_to_binary(A);
 clientid_to_binary(B) when is_binary(B) ->
     B.
-
-down_reason_to_result(normal) ->
-    ok;
-down_reason_to_result(shutdown) ->
-    ok;
-down_reason_to_result({shutdown, Result}) ->
-    Result;
-down_reason_to_result(noproc) ->
-    {error, noproc};
-down_reason_to_result(Error) ->
-    {error, {internal_error, Error}}.
-
-with_new_packet(#{mode := async}, _PacketId, Fun) ->
-    Fun();
-with_new_packet(#{mode := sync}, PacketId, Fun) ->
-    emqx_ft_async_reply:with_new_packet(PacketId, Fun, undefined).

apps/emqx_ft/src/emqx_ft_async_reply.erl

@@ -1,122 +0,0 @@
-%%--------------------------------------------------------------------
-%% Copyright (c) 2023-2024 EMQ Technologies Co., Ltd. All Rights Reserved.
-%%
-%% Licensed under the Apache License, Version 2.0 (the "License");
-%% you may not use this file except in compliance with the License.
-%% You may obtain a copy of the License at
-%%
-%%     http://www.apache.org/licenses/LICENSE-2.0
-%%
-%% Unless required by applicable law or agreed to in writing, software
-%% distributed under the License is distributed on an "AS IS" BASIS,
-%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-%% See the License for the specific language governing permissions and
-%% limitations under the License.
-%%--------------------------------------------------------------------
-
--module(emqx_ft_async_reply).
-
--include_lib("emqx/include/logger.hrl").
--include_lib("emqx/include/types.hrl").
--include_lib("stdlib/include/ms_transform.hrl").
-
--export([
-    create_tables/0,
-    info/0
-]).
-
--export([
-    register/3,
-    register/4,
-    take_by_mref/1,
-    with_new_packet/3,
-    deregister_all/1
-]).
-
--type channel_pid() :: pid().
--type mon_ref() :: reference().
--type timer_ref() :: reference().
--type packet_id() :: emqx_types:packet_id().
-
-%% packets waiting for async workers
-
--define(MON_TAB, emqx_ft_async_mons).
--define(MON_KEY(MRef), ?MON_KEY(self(), MRef)).
--define(MON_KEY(ChannelPid, MRef), {ChannelPid, MRef}).
--define(MON_RECORD(KEY, PACKET_ID, TREF, DATA), {KEY, PACKET_ID, TREF, DATA}).
-
-%% async worker monitors by packet ids
-
--define(PACKET_TAB, emqx_ft_async_packets).
--define(PACKET_KEY(PacketId), ?PACKET_KEY(self(), PacketId)).
--define(PACKET_KEY(ChannelPid, PacketId), {ChannelPid, PacketId}).
--define(PACKET_RECORD(KEY, MREF, DATA), {KEY, MREF, DATA}).
-
-%%--------------------------------------------------------------------
-%% API
-%% -------------------------------------------------------------------
-
--spec create_tables() -> ok.
-create_tables() ->
-    EtsOptions = [
-        named_table,
-        public,
-        ordered_set,
-        {read_concurrency, true},
-        {write_concurrency, true}
-    ],
-    ok = emqx_utils_ets:new(?MON_TAB, EtsOptions),
-    ok = emqx_utils_ets:new(?PACKET_TAB, EtsOptions),
-    ok.
-
--spec register(packet_id(), mon_ref(), timer_ref(), term()) -> ok.
-register(PacketId, MRef, TRef, Data) ->
-    _ = ets:insert(?PACKET_TAB, ?PACKET_RECORD(?PACKET_KEY(PacketId), MRef, Data)),
-    _ = ets:insert(?MON_TAB, ?MON_RECORD(?MON_KEY(MRef), PacketId, TRef, Data)),
-    ok.
-
--spec register(mon_ref(), timer_ref(), term()) -> ok.
-register(MRef, TRef, Data) ->
-    _ = ets:insert(?MON_TAB, ?MON_RECORD(?MON_KEY(MRef), undefined, TRef, Data)),
-    ok.
-
--spec with_new_packet(packet_id(), fun(() -> any()), any()) -> any().
-with_new_packet(PacketId, Fun, Default) ->
-    case ets:member(?PACKET_TAB, ?PACKET_KEY(PacketId)) of
-        true -> Default;
-        false -> Fun()
-    end.
-
--spec take_by_mref(mon_ref()) -> {ok, packet_id() | undefined, timer_ref(), term()} | not_found.
-take_by_mref(MRef) ->
-    case ets:take(?MON_TAB, ?MON_KEY(MRef)) of
-        [?MON_RECORD(_, PacketId, TRef, Data)] ->
-            PacketId =/= undefined andalso ets:delete(?PACKET_TAB, ?PACKET_KEY(PacketId)),
-            {ok, PacketId, TRef, Data};
-        [] ->
-            not_found
-    end.
-
--spec deregister_all(channel_pid()) -> ok.
-deregister_all(ChannelPid) ->
-    ok = deregister_packets(ChannelPid),
-    ok = deregister_mons(ChannelPid),
-    ok.
-
--spec info() -> {non_neg_integer(), non_neg_integer()}.
-info() ->
-    {ets:info(?MON_TAB, size), ets:info(?PACKET_TAB, size)}.
-
-%%--------------------------------------------------------------------
-%% Internal
-%%-------------------------------------------------------------------
-
-deregister_packets(ChannelPid) when is_pid(ChannelPid) ->
-    MS = [{?PACKET_RECORD(?PACKET_KEY(ChannelPid, '_'), '_', '_'), [], [true]}],
-    _ = ets:select_delete(?PACKET_TAB, MS),
-    ok.
-
-deregister_mons(ChannelPid) ->
-    MS = [{?MON_RECORD(?MON_KEY(ChannelPid, '_'), '_', '_', '_'), [], [true]}],
-    _ = ets:select_delete(?MON_TAB, MS),
-    ok.

apps/emqx_ft/src/emqx_ft_responder.erl

@@ -0,0 +1,116 @@
+%%--------------------------------------------------------------------
+%% Copyright (c) 2023-2024 EMQ Technologies Co., Ltd. All Rights Reserved.
+%%
+%% Licensed under the Apache License, Version 2.0 (the "License");
+%% you may not use this file except in compliance with the License.
+%% You may obtain a copy of the License at
+%%
+%%     http://www.apache.org/licenses/LICENSE-2.0
+%%
+%% Unless required by applicable law or agreed to in writing, software
+%% distributed under the License is distributed on an "AS IS" BASIS,
+%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+%% See the License for the specific language governing permissions and
+%% limitations under the License.
+%%--------------------------------------------------------------------
+
+-module(emqx_ft_responder).
+
+-behaviour(gen_server).
+
+-include_lib("emqx/include/logger.hrl").
+-include_lib("emqx/include/types.hrl").
+
+-include_lib("snabbkaffe/include/snabbkaffe.hrl").
+
+%% API
+-export([start/3]).
+-export([kickoff/2]).
+-export([ack/2]).
+
+%% Supervisor API
+-export([start_link/3]).
+
+-export([init/1, handle_call/3, handle_cast/2, handle_info/2, terminate/2]).
+
+-define(REF(Key), {via, gproc, {n, l, {?MODULE, Key}}}).
+
+-type key() :: term().
+-type respfun() :: fun(({ack, _Result} | {down, _Result} | timeout) -> _SideEffect).
+
+%%--------------------------------------------------------------------
+%% API
+%% -------------------------------------------------------------------
+
+-spec start(key(), respfun(), timeout()) -> startlink_ret().
+start(Key, RespFun, Timeout) ->
+    emqx_ft_responder_sup:start_child(Key, RespFun, Timeout).
+
+-spec kickoff(key(), pid()) -> ok.
+kickoff(Key, Pid) ->
+    gen_server:call(?REF(Key), {kickoff, Pid}).
+
+-spec ack(key(), _Result) -> _Return.
+ack(Key, Result) ->
+    % TODO: it's possible to avoid term copy
+    gen_server:call(?REF(Key), {ack, Result}, infinity).
+
+-spec start_link(key(), timeout(), respfun()) -> startlink_ret().
+start_link(Key, RespFun, Timeout) ->
+    gen_server:start_link(?REF(Key), ?MODULE, {Key, RespFun, Timeout}, []).
+
+%%--------------------------------------------------------------------
+%% gen_server callbacks
+%% -------------------------------------------------------------------
+
+init({Key, RespFun, Timeout}) ->
+    _ = erlang:process_flag(trap_exit, true),
+    _TRef = erlang:send_after(Timeout, self(), timeout),
+    {ok, {Key, RespFun}}.
+
+handle_call({kickoff, Pid}, _From, St) ->
+    % TODO: more state?
+    _MRef = erlang:monitor(process, Pid),
+    _ = Pid ! kickoff,
+    {reply, ok, St};
+handle_call({ack, Result}, _From, {Key, RespFun}) ->
+    Ret = apply(RespFun, [{ack, Result}]),
+    ?tp(debug, ft_responder_ack, #{key => Key, result => Result, return => Ret}),
+    {stop, {shutdown, Ret}, Ret, undefined};
+handle_call(Msg, _From, State) ->
+    ?SLOG(warning, #{msg => "unknown_call", call_msg => Msg}),
+    {reply, {error, unknown_call}, State}.
+
+handle_cast(Msg, State) ->
+    ?SLOG(warning, #{msg => "unknown_cast", cast_msg => Msg}),
+    {noreply, State}.
+
+handle_info(timeout, {Key, RespFun}) ->
+    Ret = apply(RespFun, [timeout]),
+    ?tp(debug, ft_responder_timeout, #{key => Key, return => Ret}),
+    {stop, {shutdown, Ret}, undefined};
+handle_info({'DOWN', _MRef, process, _Pid, Reason}, {Key, RespFun}) ->
+    Ret = apply(RespFun, [{down, map_down_reason(Reason)}]),
+    ?tp(debug, ft_responder_procdown, #{key => Key, reason => Reason, return => Ret}),
+    {stop, {shutdown, Ret}, undefined};
+handle_info(Msg, State) ->
+    ?SLOG(warning, #{msg => "unknown_message", info_msg => Msg}),
+    {noreply, State}.
+
+terminate(_Reason, undefined) ->
+    ok;
+terminate(Reason, {Key, RespFun}) ->
+    Ret = apply(RespFun, [timeout]),
+    ?tp(debug, ft_responder_shutdown, #{key => Key, reason => Reason, return => Ret}),
+    ok.
+
+map_down_reason(normal) ->
+    ok;
+map_down_reason(shutdown) ->
+    ok;
+map_down_reason({shutdown, Result}) ->
+    Result;
+map_down_reason(noproc) ->
+    {error, noproc};
+map_down_reason(Error) ->
+    {error, {internal_error, Error}}.

apps/emqx_ft/src/emqx_ft_responder_sup.erl

@@ -0,0 +1,48 @@
+%%--------------------------------------------------------------------
+%% Copyright (c) 2023 EMQ Technologies Co., Ltd. All Rights Reserved.
+%%
+%% Licensed under the Apache License, Version 2.0 (the "License");
+%% you may not use this file except in compliance with the License.
+%% You may obtain a copy of the License at
+%%
+%%     http://www.apache.org/licenses/LICENSE-2.0
+%%
+%% Unless required by applicable law or agreed to in writing, software
+%% distributed under the License is distributed on an "AS IS" BASIS,
+%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+%% See the License for the specific language governing permissions and
+%% limitations under the License.
+%%--------------------------------------------------------------------
+
+-module(emqx_ft_responder_sup).
+
+-export([start_link/0]).
+-export([start_child/3]).
+
+-behaviour(supervisor).
+-export([init/1]).
+
+-define(SUPERVISOR, ?MODULE).
+
+%%
+
+-spec start_link() -> {ok, pid()}.
+start_link() ->
+    supervisor:start_link({local, ?SUPERVISOR}, ?MODULE, []).
+
+start_child(Key, RespFun, Timeout) ->
+    supervisor:start_child(?SUPERVISOR, [Key, RespFun, Timeout]).
+
+-spec init(_) -> {ok, {supervisor:sup_flags(), [supervisor:child_spec()]}}.
+init(_) ->
+    Flags = #{
+        strategy => simple_one_for_one,
+        intensity => 100,
+        period => 100
+    },
+    ChildSpec = #{
+        id => responder,
+        start => {emqx_ft_responder, start_link, []},
+        restart => temporary
+    },
+    {ok, {Flags, [ChildSpec]}}.

apps/emqx_ft/src/emqx_ft_sup.erl

@@ -28,8 +28,6 @@ start_link() ->
     supervisor:start_link({local, ?SERVER}, ?MODULE, []).
 
 init([]) ->
-    ok = emqx_ft_async_reply:create_tables(),
-
     SupFlags = #{
         strategy => one_for_one,
         intensity => 100,
@@ -54,5 +52,14 @@ init([]) ->
         modules => [emqx_ft_storage_fs_reader_sup]
     },
 
-    ChildSpecs = [AssemblerSup, FileReaderSup],
+    ResponderSup = #{
+        id => emqx_ft_responder_sup,
+        start => {emqx_ft_responder_sup, start_link, []},
+        restart => permanent,
+        shutdown => infinity,
+        type => supervisor,
+        modules => [emqx_ft_responder_sup]
+    },
+
+    ChildSpecs = [ResponderSup, AssemblerSup, FileReaderSup],
     {ok, {SupFlags, ChildSpecs}}.

apps/emqx_ft/test/emqx_ft_SUITE.erl

@@ -55,7 +55,8 @@ groups() ->
             t_assemble_timeout
         ]},
         {async_mode, [], [
-            {group, single_node}
+            {group, single_node},
+            t_client_disconnect_while_assembling
         ]},
         {sync_mode, [], [
             {group, single_node}
@@ -116,9 +117,9 @@ init_per_group(Group = cluster, Config) ->
     Nodes = emqx_cth_cluster:start(Cluster, #{work_dir => WorkDir}),
     [{group, Group}, {cluster_nodes, Nodes} | Config];
 init_per_group(_Group = async_mode, Config) ->
-    [{mode, sync} | Config];
-init_per_group(_Group = sync_mode, Config) ->
     [{mode, async} | Config];
+init_per_group(_Group = sync_mode, Config) ->
+    [{mode, sync} | Config];
 init_per_group(Group, Config) ->
     [{group, Group} | Config].
 
@@ -529,6 +530,62 @@ t_assemble_timeout(Config) ->
 
     ?assert(2_000_000 < Time).
 
+t_client_disconnect_while_assembling(Config) ->
+    ClientId = atom_to_binary(?FUNCTION_NAME),
+    {ok, Client} = emqtt:start_link([{proto_ver, v5}, {clientid, ClientId}]),
+    {ok, _} = emqtt:connect(Client),
+
+    Filename = "topsecret.pdf",
+    FileId = <<"f1">>,
+
+    Data = <<"data">>,
+
+    Meta = #{size := Filesize} = meta(Filename, Data),
+
+    ?assertRCName(
+        success,
+        emqtt:publish(Client, mk_init_topic(Config, FileId), encode_meta(Meta), 1)
+    ),
+
+    ?assertRCName(
+        success,
+        emqtt:publish(Client, mk_segment_topic(Config, FileId, 0), Data, 1)
+    ),
+
+    ResponseTopic = emqx_ft_test_helpers:response_topic(ClientId),
+
+    {ok, OtherClient} = emqtt:start_link([{proto_ver, v5}, {clientid, <<"other">>}]),
+    {ok, _} = emqtt:connect(OtherClient),
+    {ok, _, _} = emqtt:subscribe(OtherClient, ResponseTopic, 1),
+
+    FinTopic = mk_fin_topic(Config, FileId, Filesize),
+
+    ?assertRCName(
+        success,
+        emqtt:publish(Client, FinTopic, <<>>, 1)
+    ),
+
+    ok = emqtt:stop(Client),
+
+    ResultReceive = fun Receive() ->
+        receive
+            {publish, #{payload := Payload, topic := ResponseTopic}} ->
+                case emqx_utils_json:decode(Payload) of
+                    #{<<"topic">> := FinTopic, <<"reason_code">> := 0} ->
+                        ok;
+                    #{<<"topic">> := FinTopic, <<"reason_code">> := _} = FTResult ->
+                        ct:fail("unexpected fin result: ~p", [FTResult]);
+                    _ ->
+                        Receive()
+                end
+        after 1000 ->
+            ct:fail("timeout waiting for fin result")
+        end
+    end,
+    ResultReceive(),
+
+    ok = emqtt:stop(OtherClient).
+
 %%--------------------------------------------------------------------
 %% Cluster tests
 %%--------------------------------------------------------------------

apps/emqx_ft/test/emqx_ft_async_reply_SUITE.erl

@@ -1,247 +0,0 @@
-%%--------------------------------------------------------------------
-%% Copyright (c) 2020-2024 EMQ Technologies Co., Ltd. All Rights Reserved.
-%%
-%% Licensed under the Apache License, Version 2.0 (the "License");
-%% you may not use this file except in compliance with the License.
-%% You may obtain a copy of the License at
-%%
-%%     http://www.apache.org/licenses/LICENSE-2.0
-%%
-%% Unless required by applicable law or agreed to in writing, software
-%% distributed under the License is distributed on an "AS IS" BASIS,
-%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-%% See the License for the specific language governing permissions and
-%% limitations under the License.
-%%--------------------------------------------------------------------
-
--module(emqx_ft_async_reply_SUITE).
-
--compile(export_all).
--compile(nowarn_export_all).
-
--include_lib("common_test/include/ct.hrl").
--include_lib("stdlib/include/assert.hrl").
--include_lib("emqx/include/asserts.hrl").
-
-all() -> emqx_common_test_helpers:all(?MODULE).
-
-init_per_suite(Config) ->
-    Apps = emqx_cth_suite:start(
-        [
-            {emqx, #{override_env => [{boot_modules, [broker, listeners]}]}},
-            {emqx_ft, "file_transfer { enable = true, assemble_timeout = 1s }"}
-        ],
-        #{work_dir => ?config(priv_dir, Config)}
-    ),
-    [{suite_apps, Apps} | Config].
-
-end_per_suite(Config) ->
-    ok = emqx_cth_suite:stop(?config(suite_apps, Config)),
-    ok.
-
-init_per_testcase(_Case, Config) ->
-    ok = snabbkaffe:start_trace(),
-    Config.
-
-end_per_testcase(_Case, _Config) ->
-    ok = snabbkaffe:stop(),
-    ok.
-
-%%--------------------------------------------------------------------
-%% Tests
-%%--------------------------------------------------------------------
-
-t_register(_Config) ->
-    PacketId = 1,
-    MRef = make_ref(),
-    TRef = make_ref(),
-    ok = emqx_ft_async_reply:register(PacketId, MRef, TRef, somedata),
-
-    ?assertEqual(
-        undefined,
-        emqx_ft_async_reply:with_new_packet(PacketId, fun() -> ok end, undefined)
-    ),
-
-    ?assertEqual(
-        ok,
-        emqx_ft_async_reply:with_new_packet(2, fun() -> ok end, undefined)
-    ),
-
-    ?assertEqual(
-        {ok, PacketId, TRef, somedata},
-        emqx_ft_async_reply:take_by_mref(MRef)
-    ).
-
-t_process_independence(_Config) ->
-    PacketId = 1,
-    MRef = make_ref(),
-    TRef = make_ref(),
-    ok = emqx_ft_async_reply:register(PacketId, MRef, TRef, somedata),
-
-    Self = self(),
-
-    spawn_link(fun() ->
-        Self ! emqx_ft_async_reply:take_by_mref(MRef)
-    end),
-
-    Res1 =
-        receive
-            Msg1 -> Msg1
-        end,
-
-    ?assertEqual(
-        not_found,
-        Res1
-    ),
-
-    spawn_link(fun() ->
-        Self ! emqx_ft_async_reply:with_new_packet(PacketId, fun() -> ok end, undefined)
-    end),
-
-    Res2 =
-        receive
-            Msg2 -> Msg2
-        end,
-
-    ?assertEqual(
-        ok,
-        Res2
-    ).
-
-t_take(_Config) ->
-    PacketId = 1,
-    MRef = make_ref(),
-    TRef = make_ref(),
-    ok = emqx_ft_async_reply:register(PacketId, MRef, TRef, somedata),
-
-    ?assertEqual(
-        {ok, PacketId, TRef, somedata},
-        emqx_ft_async_reply:take_by_mref(MRef)
-    ),
-
-    ?assertEqual(
-        not_found,
-        emqx_ft_async_reply:take_by_mref(MRef)
-    ),
-
-    ?assertEqual(
-        ok,
-        emqx_ft_async_reply:with_new_packet(2, fun() -> ok end, undefined)
-    ).
-
-t_cleanup(_Config) ->
-    PacketId = 1,
-    MRef0 = make_ref(),
-    TRef0 = make_ref(),
-    MRef1 = make_ref(),
-    TRef1 = make_ref(),
-    ok = emqx_ft_async_reply:register(PacketId, MRef0, TRef0, somedata0),
-
-    Self = self(),
-
-    Pid = spawn_link(fun() ->
-        ok = emqx_ft_async_reply:register(PacketId, MRef1, TRef1, somedata1),
-        receive
-            kickoff ->
-                ?assertEqual(
-                    undefined,
-                    emqx_ft_async_reply:with_new_packet(PacketId, fun() -> ok end, undefined)
-                ),
-
-                ?assertEqual(
-                    {ok, PacketId, TRef1, somedata1},
-                    emqx_ft_async_reply:take_by_mref(MRef1)
-                ),
-
-                Self ! done
-        end
-    end),
-
-    ?assertEqual(
-        undefined,
-        emqx_ft_async_reply:with_new_packet(PacketId, fun() -> ok end, undefined)
-    ),
-
-    ok = emqx_ft_async_reply:deregister_all(Self),
-
-    ?assertEqual(
-        ok,
-        emqx_ft_async_reply:with_new_packet(PacketId, fun() -> ok end, undefined)
-    ),
-
-    Pid ! kickoff,
-
-    receive
-        done -> ok
-    end.
-
-t_reply_by_tiemout(_Config) ->
-    process_flag(trap_exit, true),
-    ClientId = atom_to_binary(?FUNCTION_NAME),
-    C = emqx_ft_test_helpers:start_client(ClientId, node()),
-
-    SleepForever = fun() ->
-        Ref = make_ref(),
-        receive
-            Ref -> ok
-        end
-    end,
-
-    ok = meck:new(emqx_ft_storage, [passthrough]),
-    meck:expect(emqx_ft_storage, assemble, fun(_, _, _) -> {async, spawn_link(SleepForever)} end),
-
-    FinTopic = <<"$file/fakeid/fin/999999">>,
-
-    ?assertMatch(
-        {ok, #{reason_code_name := unspecified_error}},
-        emqtt:publish(C, FinTopic, <<>>, 1)
-    ),
-
-    meck:unload(emqx_ft_storage),
-    emqtt:stop(C).
-
-t_cleanup_by_cm(_Config) ->
-    process_flag(trap_exit, true),
-    ClientId = atom_to_binary(?FUNCTION_NAME),
-    C = emqx_ft_test_helpers:start_client(ClientId, node()),
-
-    ok = meck:new(emqx_ft_storage, [passthrough]),
-    meck:expect(emqx_ft_storage, kickoff, fun(_) -> meck:exception(error, oops) end),
-
-    FinTopic = <<"$file/fakeid/fin/999999">>,
-
-    [ClientPid] = emqx_cm:lookup_channels(ClientId),
-
-    ?assertWaitEvent(
-        begin
-            emqtt:publish(C, FinTopic, <<>>, 1),
-            exit(ClientPid, kill)
-        end,
-        #{?snk_kind := emqx_cm_clean_down, client_id := ClientId},
-        1000
-    ),
-
-    ?assertEqual(
-        {0, 0},
-        emqx_ft_async_reply:info()
-    ),
-
-    meck:unload(emqx_ft_storage).
-
-t_unrelated_events(_Config) ->
-    process_flag(trap_exit, true),
-    ClientId = atom_to_binary(?FUNCTION_NAME),
-    C = emqx_ft_test_helpers:start_client(ClientId, node()),
-    [ClientPid] = emqx_cm:lookup_channels(ClientId),
-
-    erlang:monitor(process, ClientPid),
-
-    ClientPid ! {'DOWN', make_ref(), process, self(), normal},
-    ClientPid ! {timeout, make_ref(), unknown_timer_event},
-
-    ?assertNotReceive(
-        {'DOWN', _Ref, process, ClientPid, _Reason},
-        500
-    ),
-
-    emqtt:stop(C).

apps/emqx_ft/test/emqx_ft_responder_SUITE.erl

@@ -0,0 +1,93 @@
+%%--------------------------------------------------------------------
+%% Copyright (c) 2020-2024 EMQ Technologies Co., Ltd. All Rights Reserved.
+%%
+%% Licensed under the Apache License, Version 2.0 (the "License");
+%% you may not use this file except in compliance with the License.
+%% You may obtain a copy of the License at
+%%
+%%     http://www.apache.org/licenses/LICENSE-2.0
+%%
+%% Unless required by applicable law or agreed to in writing, software
+%% distributed under the License is distributed on an "AS IS" BASIS,
+%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+%% See the License for the specific language governing permissions and
+%% limitations under the License.
+%%--------------------------------------------------------------------
+
+-module(emqx_ft_responder_SUITE).
+
+-compile(export_all).
+-compile(nowarn_export_all).
+
+-include_lib("common_test/include/ct.hrl").
+-include_lib("stdlib/include/assert.hrl").
+-include_lib("emqx/include/asserts.hrl").
+
+all() -> emqx_common_test_helpers:all(?MODULE).
+
+init_per_suite(Config) ->
+    Apps = emqx_cth_suite:start(
+        [
+            {emqx_ft, "file_transfer {enable = true}"}
+        ],
+        #{work_dir => ?config(priv_dir, Config)}
+    ),
+    [{suite_apps, Apps} | Config].
+
+end_per_suite(Config) ->
+    ok = emqx_cth_suite:stop(?config(suite_apps, Config)),
+    ok.
+
+init_per_testcase(_Case, Config) ->
+    Config.
+
+end_per_testcase(_Case, _Config) ->
+    ok.
+
+t_start_ack(_Config) ->
+    Key = <<"test">>,
+    DefaultAction = fun({ack, Ref}) -> Ref end,
+    {ok, ResponderPid} = emqx_ft_responder:start(Key, DefaultAction, 1000),
+    erlang:monitor(process, ResponderPid),
+    ?assertMatch(
+        {error, {already_started, _Pid}},
+        emqx_ft_responder:start(Key, DefaultAction, 1000)
+    ),
+    Ref = make_ref(),
+    ?assertEqual(
+        Ref,
+        emqx_ft_responder:ack(Key, Ref)
+    ),
+    ?assertExit(
+        {noproc, _},
+        emqx_ft_responder:ack(Key, Ref)
+    ),
+    ?assertReceive(
+        {'DOWN', _, process, ResponderPid, {shutdown, _}},
+        1000
+    ).
+
+t_timeout(_Config) ->
+    Key = <<"test">>,
+    Self = self(),
+    DefaultAction = fun(timeout) -> Self ! {timeout, Key} end,
+    {ok, _Pid} = emqx_ft_responder:start(Key, DefaultAction, 20),
+    receive
+        {timeout, Key} ->
+            ok
+    after 100 ->
+        ct:fail("emqx_ft_responder not called")
+    end,
+    ?assertExit(
+        {noproc, _},
+        emqx_ft_responder:ack(Key, oops)
+    ).
+
+t_unknown_msgs(_Config) ->
+    {ok, Pid} = emqx_ft_responder:start(make_ref(), fun(_) -> ok end, 100),
+    Pid ! {unknown_msg, <<"test">>},
+    ok = gen_server:cast(Pid, {unknown_msg, <<"test">>}),
+    ?assertEqual(
+        {error, unknown_call},
+        gen_server:call(Pid, {unknown_call, <<"test">>})
+    ).

changes/ce/fix-12514.en.md

@@ -0,0 +1,3 @@
+Fixed file transfer command result reporting to the `$file-response/${clientid}` channel.
+
+Previously, if a channel issued an `assemble` command but disconnected before the assemble was completed, the status message was lost (not sent to the response topic).