nlocks

A Node.js library providing asynchronous locking mechanisms including in-memory locks and file-based locks for coordinating access to resources across concurrent processes.

Features

• AsyncLock: In-memory asynchronous lock for coordinating access to resources within a single process
• FileLock: File-based lock for coordinating access to resources across multiple processes
• Lightweight and easy to use
• Promise-based API
• Comprehensive test coverage

Installation

npm install nlocks

Usage

Via index.js (recommended)

const { AsyncLock, FileLock } = require('nlocks');

const asyncLock = new AsyncLock();
const fileLock = new FileLock();

AsyncLock

An in-memory lock for synchronizing async operations within a single Node.js process:

const AsyncLock = require('nlocks/async-lock');

const lock = new AsyncLock();

async function protectedOperation() {
  await lock.acquire();
  try {
    // Your critical section code here
    console.log('Performing protected operation');
    await someAsyncWork();
  } finally {
    lock.release();
  }
}

FileLock

A file-based lock for synchronizing operations across multiple Node.js processes:

const FileLock = require('nlocks/file-lock');

const lock = new FileLock();

async function fileProtectedOperation() {
  await lock.acquire('/path/to/your/file.txt');
  try {
    // Your file operation code here
    console.log('Performing file operation');
    await someFileAsyncWork();
  } finally {
    lock.release('/path/to/your/file.txt');
  }
}

API

AsyncLock

• new AsyncLock() - Creates a new AsyncLock instance
• acquire(): Promise<void> - Acquires the lock
• release(): void - Releases the lock

FileLock

• new FileLock() - Creates a new FileLock instance
• acquire(filePath): Promise<void> - Acquires a lock for the specified file path
• release(filePath): void - Releases the lock for the specified file path

Testing

Run the test suite with:

npm test

License

MIT