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The lockfile npm package is used to create and manage lock files, which are useful for ensuring that only one instance of a process is running at a time. This can be particularly useful in scenarios where you want to prevent race conditions or ensure that a resource is not accessed concurrently by multiple processes.
Creating a Lockfile
This feature allows you to create a lockfile to ensure that only one instance of a process is running. The code sample demonstrates how to acquire a lock with specific options and release it after the work is done.
const lockFile = require('lockfile');
const options = {
wait: 10000, // Wait for 10 seconds
pollPeriod: 100, // Check every 100ms
stale: 30000, // Consider the lock stale after 30 seconds
retries: 3, // Retry 3 times
retryWait: 100 // Wait 100ms between retries
};
lockFile.lock('path/to/file.lock', options, function (err) {
if (err) {
console.error('Failed to acquire lock:', err);
} else {
console.log('Lock acquired');
// Do some work
lockFile.unlock('path/to/file.lock', function (err) {
if (err) {
console.error('Failed to release lock:', err);
} else {
console.log('Lock released');
}
});
}
});
Checking Lockfile Status
This feature allows you to check if a lockfile is currently active. The code sample demonstrates how to check the status of a lockfile and handle the result.
const lockFile = require('lockfile');
lockFile.check('path/to/file.lock', function (err, isLocked) {
if (err) {
console.error('Error checking lock status:', err);
} else if (isLocked) {
console.log('File is locked');
} else {
console.log('File is not locked');
}
});
Updating Lockfile Options
This feature allows you to update the options for a lockfile, such as the stale time. The code sample demonstrates how to acquire a lock with updated options and release it after the work is done.
const lockFile = require('lockfile');
const options = {
stale: 60000 // Consider the lock stale after 60 seconds
};
lockFile.lock('path/to/file.lock', options, function (err) {
if (err) {
console.error('Failed to acquire lock:', err);
} else {
console.log('Lock acquired with updated options');
// Do some work
lockFile.unlock('path/to/file.lock', function (err) {
if (err) {
console.error('Failed to release lock:', err);
} else {
console.log('Lock released');
}
});
}
});
The proper-lockfile package provides similar functionality to lockfile, allowing you to create and manage lock files. It offers additional features such as automatic lock renewal and customizable lockfile paths. Compared to lockfile, proper-lockfile provides a more modern API and additional configuration options.
The async-lock package is another alternative that provides locking mechanisms for asynchronous code. It allows you to create locks for specific keys and ensures that only one function can execute for a given key at a time. While it does not create physical lock files, it provides a similar functionality for managing concurrency in asynchronous code.
The redlock package is a distributed lock manager for Redis. It allows you to create and manage locks across multiple Redis instances, providing high availability and fault tolerance. Compared to lockfile, redlock is designed for distributed systems and offers more robust locking mechanisms for distributed environments.
A very, very simple library for checking and creating lockfiles in Node.js. Note that it does not use the Linux lockfile
utility; instead, it uses Node.js to access the filesystem directory.
Written in CoffeeScript 1.0.
npm install lockfile
lockfile = require 'lockfile'
lockfile.check 'dir/file1.lock', (conflict) -> return console.log "I should stop because the lockfile already exists" if conflict # things to do if there is no lockfile goes here...
lockfile.create 'dir/file2.lock' # synchronously create a lock file
lockfile.checkOrCreate 'dir/file3.lock', (conflict) -> return console.log "I should stop because the lockfile already exists" if conflict # if you've gotten this far, the lock has been created
The checkOrCreate
method is by far the most useful.
Lockfile creation/checking is part of the much more feature-rich https://github.com/Slashed/daemon.node. Check that out (some of its forks are more up-to-date).
(c) 2011 and MIT-licensed by Trevor Burnham.
FAQs
A very polite lock file utility, which endeavors to not litter, and to wait patiently for others.
The npm package lockfile receives a total of 1,248,191 weekly downloads. As such, lockfile popularity was classified as popular.
We found that lockfile demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 2 open source maintainers collaborating on the project.
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