Safe Redis Leader

Fork of: Safe Redis Leader

1. Built with typescript
2. New tests running with Jest and testing multiple instances at the same time to make sure there is only 1 leader at all time
3. New event (main reason of this fork)

• After an election, all the instances will send an event either elected or notElected

Goal

The Safe Redis Leader TS module is designed to provide a leader election implementation that provides tested gaurentees that there is only a single leader elected from a group of clients at one time.

The implementation is a port of the stale Redis Leader npm package that implements a solution to the known race condition. Additionally, this rewritten package:

1. Only exposes public api functions that should be exposed (no more public-but-should-be-private _elect fn)
2. has a test suite within docker-compose using a real redis instance, which allows anyone to run the tests with no heavy dependency setup
3. Replace callback-hell with async/await

Usage

Install the package:

  npm install ts-safe-redis-leader

Exemple:

  import * as Redis from "ioredis";
  import { SafeRedisLeader } from "../src";
  
  const redisConfig: Redis.RedisOptions = {
    port: 6379,
    host: "localhost",
    autoResubscribe: false,
    lazyConnect: true,
    maxRetriesPerRequest: 0,
  };
  const redisClient = new Redis(redisConfig);

  const leaderElectionKey = 'the-election';
  const safeLeader = new SafeRedisLeader(redisClients[i], 1500, 3000, leaderElectionKey);

  await safeLeader.elect();

License

MIT