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%% Copyright (c) 2023 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(pgec_storage_truncate). |
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-export([callback_mode/0]). |
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-export([handle_event/4]). |
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-import(pgec_statem, [nei/1]). |
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-include_lib("kernel/include/logger.hrl"). |
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callback_mode() -> |
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handle_event_function. |
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handle_event({call, _}, _, {truncate, _}, _) -> |
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{keep_state_and_data, postpone}; |
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handle_event(internal, |
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{truncate = Action, #{bucket := Bucket}}, |
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{Action, Ref}, |
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_) -> |
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{keep_state_and_data, |
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nei({keys, |
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#{bucket => Bucket, |
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folder => fun |
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(_, Key, A) -> |
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[Key | A] |
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end, |
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ref => Ref, |
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accumulator => []}})}; |
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handle_event(internal, |
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{response, |
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#{reply := {async, F}, |
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label := #{bucket := Bucket, ref := Ref}}}, |
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{truncate, Ref}, |
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#{previous := {ready, _} = Previous} = Data) -> |
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{next_state, |
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Previous, |
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maps:without([previous], Data), |
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lists:foldl( |
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fun |
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(Key, A) -> |
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[nei({delete, |
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#{bucket => Bucket, |
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key => Key}}) | A] |
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end, |
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[pop_callback_module], |
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F())}; |
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handle_event(EventType, EventContent, State, Data) -> |
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pgec_storage_common:handle_event(EventType, |
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EventContent, |
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State, |
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Data). |