esnowflake

esnowflake is Erlang/OTP application to generate uniq ID.
Original design: Twitter IDs (snowflake).
Documentation

Usage

> application:start(esnowflake).
ok

> Id = esnowflake:generate_id().
896221795344384

> esnowflake:generate_ids(2).
[896498611015681,896498611015680]

> esnowflake:to_unixtime(Id).
1509193995927

> esnowflake:stats().
[{version,"0.3.0"},
 {worker_num,10},
 {worker_ids,[0,1,2,3,4,5,6,7,8,9]}]

Config

worker id

application environment variable

This must be specified as not to duplicate worker ids if you use multi nodes.

params | default | explain ----------------- | ------- | --------------------------------------------------------- worker_num | 2 | number of generate id workers worker_min_max_id | [0, 9] | worker ids redis | - | eredis config for assigning worker ids automatically

• redis config params | default --------------- | ---------------------------------- host | localhost port | 6379 database | 0 password | (empty) reconnect_sleep | please check eredis:start_link/1 connect_timeout | please check eredis:start_link/1

• app.conf

[
    {esnowflake, [{worker_min_max_id, [0, 9]}]}
]

Bench

----------------------------------------------------
2017-10-29 16:03:27.671
b_generate_id   100000  4564.13864 ns/op


----------------------------------------------------
2017-10-29 16:03:28.703
b_generate_id   232502 op/sec

%%% esnowflake_SUITE ==> bench.b_generate_id: OK

----------------------------------------------------
2017-10-29 16:03:29.700
b_generate_ids_100  10000   96834.8342 ns/op


----------------------------------------------------
2017-10-29 16:03:30.702
b_generate_ids_100  686 op/sec

%%% esnowflake_SUITE ==> bench.b_generate_ids: OK