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redlock

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redlock

A node.js redlock implementation for distributed redis locks


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1
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What is redlock?

Redlock is a distributed lock manager for Node.js using Redis. It implements the Redlock algorithm, which is a method for achieving distributed mutual exclusion. This is useful for ensuring that only one process can access a shared resource at a time, even in a distributed system.

What are redlock's main functionalities?

Acquiring a Lock

This feature allows you to acquire a lock on a resource. The lock is held for a specified duration (2000 ms in this example). If the lock is successfully acquired, you can perform your operations and then release the lock.

const Redlock = require('redlock');
const redis = require('redis');
const client = redis.createClient();
const redlock = new Redlock([client]);

redlock.lock('locks:resource', 2000).then(function(lock) {
  // Do something with the lock
  console.log('Lock acquired');
  // Release the lock
  return lock.unlock();
}).catch(function(err) {
  console.error('Failed to acquire lock', err);
});

Extending a Lock

This feature allows you to extend the duration of an existing lock. This is useful if you need more time to complete your operations while holding the lock.

const Redlock = require('redlock');
const redis = require('redis');
const client = redis.createClient();
const redlock = new Redlock([client]);

redlock.lock('locks:resource', 2000).then(function(lock) {
  // Extend the lock
  return lock.extend(2000);
}).then(function(lock) {
  console.log('Lock extended');
  // Release the lock
  return lock.unlock();
}).catch(function(err) {
  console.error('Failed to extend lock', err);
});

Handling Lock Failures

This feature demonstrates how to handle failures when acquiring or maintaining a lock. If an error occurs, it is caught and handled appropriately.

const Redlock = require('redlock');
const redis = require('redis');
const client = redis.createClient();
const redlock = new Redlock([client]);

redlock.lock('locks:resource', 2000).then(function(lock) {
  // Do something with the lock
  console.log('Lock acquired');
  // Simulate a failure
  throw new Error('Something went wrong');
}).catch(function(err) {
  console.error('Failed to acquire or maintain lock', err);
});

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Package last updated on 06 Mar 2022

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