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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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%% @doc An example binlog dump receiver using ETS. |
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-module(msc_binlog_ets). |
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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/0]). |
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start() -> |
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gen_statem:start({local, ?MODULE}, ?MODULE, [], []). |
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callback_mode() -> |
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:-( |
handle_event_function. |
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init([]) -> |
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:-( |
process_flag(trap_exit, true), |
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{ok, |
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ready, |
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#{mapped => #{}, |
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requests => gen_statem:reqids_new()}}. |
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handle_event( |
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{call, From}, |
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{table_map, #{table_id := TableId} = Mapping}, |
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_, |
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#{mapped := Mapped} = Data) when is_map_key(TableId, Mapped) -> |
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:-( |
{keep_state, |
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Data#{mapped := Mapped#{TableId => Mapping}}, |
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{reply, From, ok}}; |
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handle_event( |
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{call, From}, |
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{table_map, #{table_id := TableId} = Mapping}, |
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_, |
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#{mapped := Mapped} = Data) -> |
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_ = new_table(Mapping), |
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{keep_state, |
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Data#{mapped := Mapped#{TableId => Mapping}}, |
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{reply, From, ok}}; |
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handle_event( |
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{call, From}, |
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{Event, #{rows := Rows, table_id := TableId}}, |
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_, |
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#{mapped := Mapped}) when (Event == write_rows orelse |
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Event == write_rows_compressed_v1 orelse |
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Event == write_rows_v1) andalso |
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is_map_key(TableId, Mapped) -> |
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#{TableId := Mapping} = Mapped, |
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ets:insert(table_name(Mapping), |
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[insert_or_update_tuple(Row, Mapping) || Row <- Rows]), |
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{keep_state_and_data, {reply, From, ok}}; |
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handle_event({call, From}, _Event, _State, _Data) -> |
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{keep_state_and_data, {reply, From, ok}}. |
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new_table(Mapping) -> |
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try |
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ets:new(table_name(Mapping), |
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[{keypos, keypos(Mapping)}, protected, named_table]) |
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catch |
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error:badarg -> |
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ok |
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end. |
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table_name(#{table := Table, database := Database}) -> |
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binary_to_atom(<<Database/bytes, "_", Table/bytes>>). |
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keypos(#{metadata := #{simple_primary_key := [Key]}}) -> |
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Key + 1; |
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keypos(#{metadata := #{simple_primary_key := _}}) -> |
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1. |
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insert_or_update_tuple( |
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Tuple, |
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#{metadata := #{simple_primary_key := [_]}}) -> |
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Tuple; |
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insert_or_update_tuple( |
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Tuple, |
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#{metadata := #{simple_primary_key := Composite}} = Mapping) -> |
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list_to_tuple( |
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[key(Tuple, Mapping) | |
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lists:filtermap( |
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fun |
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({Position, Value}) -> |
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case lists:member(Position, Composite) of |
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true -> |
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false; |
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false -> |
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{true, Value} |
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end |
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end, |
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lists:zip( |
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lists:seq(0, tuple_size(Tuple) - 1), |
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tuple_to_list(Tuple)))]). |
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key(Tuples, KeyPositions) when is_list(Tuples) -> |
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[?FUNCTION_NAME(Tuple, KeyPositions) || Tuple <- Tuples]; |
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key(Tuple, #{metadata := #{simple_primary_key := [Primary]}}) -> |
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element(Primary + 1, Tuple); |
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key(Tuple, #{metadata := #{simple_primary_key := Composite}}) -> |
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list_to_tuple([element(Position + 1, Tuple) || Position <- Composite]). |