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%% Copyright (c) 2022 Peter Morgan <peter.james.morgan@gmail.com> |
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%% |
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%% Licensed under the Apache License, Version 2.0 (the "License"); |
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%% you may not use this file except in compliance with the License. |
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%% You may obtain a copy of the License at |
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%% |
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%% http://www.apache.org/licenses/LICENSE-2.0 |
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%% |
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%% Unless required by applicable law or agreed to in writing, software |
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%% distributed under the License is distributed on an "AS IS" BASIS, |
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%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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%% See the License for the specific language governing permissions and |
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%% limitations under the License. |
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-module(mcd_reaper). |
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-export([callback_mode/0]). |
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-export([handle_event/4]). |
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-export([init/1]). |
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-export([start_link/1]). |
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start_link(Arg) -> |
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gen_statem:start_link({local, ?MODULE}, |
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?MODULE, |
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[Arg], |
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envy_gen:options(?MODULE)). |
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init([Arg]) -> |
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process_flag(trap_exit, true), |
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{ok, ready, #{arg => Arg}}. |
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callback_mode() -> |
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handle_event_function. |
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handle_event({timeout, Key}, |
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expire, |
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_, |
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#{arg := #{callback := Module}, |
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callback_data := CallbackData}) -> |
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case Module:expire(#{key => Key, data => CallbackData}) of |
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ok -> |
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keep_state_and_data; |
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stop -> |
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:-( |
stop; |
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{stop, Reason} -> |
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:-( |
{stop, Reason} |
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end; |
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handle_event({timeout, _}, |
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flush_all, |
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_, |
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#{arg := #{callback := Module}, |
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callback_data := CallbackData}) -> |
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case Module:flush_all(#{data => CallbackData}) of |
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ok -> |
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keep_state_and_data; |
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stop -> |
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:-( |
stop; |
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{stop, Reason} -> |
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:-( |
{stop, Reason} |
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end; |
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handle_event({call, From}, {callback, #{data := CallbackData}}, _, Data) -> |
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{keep_state, |
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Data#{callback_data => CallbackData}, |
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{reply, From, ok}}; |
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handle_event({call, From}, |
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{expire = Type, #{key := Key, seconds := Expiry}}, |
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_, |
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_) -> |
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{keep_state_and_data, |
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[timeout_action(Key, Expiry, Type), {reply, From, ok}]}; |
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handle_event({call, From}, |
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{flush_all = Type, Timeout}, |
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_, |
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_) -> |
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{keep_state_and_data, |
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[timeout_action(Type, Timeout, Type), {reply, From, ok}]}. |
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timeout_action(Name, 0, expire) -> |
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{{timeout, Name}, cancel}; |
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timeout_action(Name, Time, Content) when Time < 60 * 60 * 24 * 30 -> |
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{{timeout, Name}, |
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erlang:convert_time_unit(Time, second, millisecond), |
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Content}; |
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timeout_action(Name, Time, Content) -> |
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:-( |
{{timeout, Name}, |
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mcd_time:system_to_monotonic(Time, second, millisecond), |
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Content, |
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[{abs, true}]}. |