Skip to content

ronnylt/redlock-php

master
Switch branches/tags

Name already in use

A tag already exists with the provided branch name. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Are you sure you want to create this branch?
Code

Latest commit

 

Git stats

Files

Permalink
Failed to load latest commit information.
Type
Name
Latest commit message
Commit time
src
 
 
 
 
 
 
 
 
 
 

RedLock – Redis distributed locks in PHP

Based on Redlock-rb by Salvatore Sanfilippo

This library implements the Redis-based distributed lock manager algorithm described in this blog post.

To create a lock manager:

$servers = [
    ['127.0.0.1', 6379, 0.01],
    ['127.0.0.1', 6389, 0.01],
    ['127.0.0.1', 6399, 0.01],
];

$redLock = new RedLock($servers);

To acquire a lock:

$lock = $redLock->lock('my_resource_name', 1000);

Where the resource name is an unique identifier of what you are trying to lock and 1000 is the number of milliseconds for the validity time.

The returned value is false if the lock was not acquired (you may try again), otherwise an array representing the lock is returned, having three keys:

Array
(
    [validity] => 9897.3020019531
    [resource] => my_resource_name
    [token] => 53771bfa1e775
)
  • validity, an integer representing the number of milliseconds the lock will be valid.
  • resource, the name of the locked resource as specified by the user.
  • token, a random token value which is used to safe reclaim the lock.

To release a lock:

    $redLock->unlock($lock)

It is possible to setup the number of retries (by default 3) and the retry delay (by default 200 milliseconds) used to acquire the lock.

The retry delay is actually chosen at random between $retryDelay / 2 milliseconds and the specified $retryDelay value.

Disclaimer: As stated in the original antirez's version, this code implements an algorithm which is currently a proposal, it was not formally analyzed. Make sure to understand how it works before using it in your production environments.