refactor(gw): remove needless modules

apps/emqx_gateway/src/mqttsn/emqx_sn_asleep_timer.erl

@@ -1,65 +0,0 @@
-%%--------------------------------------------------------------------
-%% Copyright (c) 2020-2021 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_sn_asleep_timer).
-
--export([ init/0
-        , ensure/2
-        , cancel/1
-        ]).
-
--record(asleep_state, {
-          %% Time internal (seconds)
-          duration :: integer(),
-          %% Timer reference
-          tref :: reference() | undefined
-         }).
-
--type(asleep_state() :: #asleep_state{}).
-
--export_type([asleep_state/0]).
-
-%%--------------------------------------------------------------------
-%% APIs
-%%--------------------------------------------------------------------
-
--spec(init() -> asleep_state()).
-init() ->
-    #asleep_state{duration = 0}.
-
--spec(ensure(undefined | integer(), asleep_state()) -> asleep_state()).
-ensure(undefined, State = #asleep_state{duration = Duration}) ->
-    ensure(Duration, State);
-ensure(Duration, State) ->
-    cancel(State),
-    State#asleep_state{duration = Duration, tref = start(Duration)}.
-
-%%--------------------------------------------------------------------
-%% Internal funcs
-%%--------------------------------------------------------------------
-
--compile({inline, [start/1, cancel/1]}).
-
-start(Duration) ->
-    erlang:send_after(timer:seconds(Duration), self(), asleep_timeout).
-
-cancel(#asleep_state{tref = Timer}) when is_reference(Timer) ->
-    case erlang:cancel_timer(Timer) of
-        false ->
-            receive {timeout, Timer, _} -> ok after 0 -> ok end;
-        _ -> ok
-    end;
-cancel(_) -> ok.