erlflake

%%%---------------------------------------------------------------------------
%%% Copyright (C) 2021, Fix Solution All Rights Reserved
%%% Unauthorized copy of this file is through any medium strictly not allowed.
%%%
%%% Authors : Alpha Shaw <shawalpha5@gmail.com>
%%% Created :  20 Apr 2021  by <shawalpha5@gmail.com>
%%% Purpose :
%%%
%%%
%%% 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.
%%%---------------------------------------------------------------------------

-include_lib("erlwater/include/erlwater.hrl").

-define(FLAKE_EPOCH_MICROS, 1577836800000000). %% 00:00:00 01 January 2020

-ifdef(FLAKE_96).
-define(TIMESTAMP_BITS, 64).
-define(SEQUENCE_BITS, 16).
-define(WORKER_BITS, 16).
-define(FLAKE_BITS, 96).
-else.
-define(TIMESTAMP_BITS, 39).
-define(SEQUENCE_BITS, 13).
-define(WORKER_BITS, 12).
-define(FLAKE_BITS, 64).
-endif.

-define(MAX_WORKER, (1 bsl ?WORKER_BITS) - 1).
-define(MAX_SEQUENCE, (1 bsl ?SEQUENCE_BITS) - 1).
-define(SEQUENCE_WORKER_BITS, ?SEQUENCE_BITS + ?WORKER_BITS).


-define(DEFAULT_ZK_HOST, <<"localhost">>).
-define(DEFAULT_ZK_PORT, 2181).

-define(WORKER_ID_ENV_VAR, "ERLFLAKE_WORKER_ID").
-define(ZK_HOST_ENV_VAR, "ERLFLAKE_ZOOKEEPER_HOST").
-define(ZK_PORT_ENV_VAR, "ERLFLAKE_ZOOKEEPER_PORT").