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passkey

v3.0.0

Published

Shared lock on top of redis

Downloads

31

Readme

passkey

Shared lock built on top of redis

Reliable locking mechanism on Redis. Performs atomic locking and verifies ownership.

Build Status Dependency Status

Usage

var redis = require('redis');
var passkey = require('passkey');

var client = redis.createClient();
var key = passkey(client, {
  ttl: 10000
});

key.lock('my-lock')
  .then(function (lock) {

    return doWork()
      .then(function () {
        // extend the lock
        return lock.ttl(10000);
      })
      .then(function () {
        return doMoreWork();
      })
      .then(function () {
        // release the lock
        return lock.unlock();
      });

  })
  .catch(passkey.LockError, function (err) {
    // lock not obtained or expired before ttl/unlock was called
  })

API

var key = passkey(client, [options])

creates a new key that can be used to set locks, expects to be called with a redis client. Options can be an object with following properties

  • ttl: time before the lock automatically expires, default: 10000ms

key.lock(key, [ttl])

lock a key, any future call to .lock with the same value will fail with a promise.LockError. The lock will expire after ttl or the default time when unspecified. returns a Lock instance.

Lock.unlock()

Release this lock so it can be obtained by another client. Fails with a promise.LockError if the lock is expired.

Lock.ttl(ttl)

Set a new ttl on this lock. This is useful to extend the lifetime of the lock. Fails with a promise.LockError if the lock is expired.