LockDB

LockDB is a cross-platform tool you can use to handle process/event locking and avoid race conditions. It is sometimes also known as a semaphore.

There are packages for Node.js/Browser/Bun/NPM, Deno, and you can also use it as a CLI.

It has no dependencies, and is very simple to use, with effectively 3 commands/actions/methods: lock('name'), unlock('name'), and check('name').

You can get your apiKey at lockdb.com or connect LockDB to your own server/API.

Usage (package)

Node/Browser/Bun/NPM

npm install --save-exact lockdb

const LockDB = require('lockdb'); // or import LockDB from 'lockdb';

const lock = new LockDB('service-id', { apiKey: 'api-key' });

// Check on a lock (optional)
const isReportLocked = await lock.check('report');
console.log(isReportLocked); // Outputs `false`

// Create a lock, returning if it was locked before
const wasReportLocked = await lock.lock('report');
console.log(isReportLocked); // Outputs `false`

// Unlock a lock, returning if it was locked before
const wasReportLockedBeforeUnlock = await lock.unlock('report');
console.log(wasReportLockedBeforeUnlock); // Outputs `true`

Deno

import LockDB from 'https://deno.land/x/lockdb@1.0.0/mod.ts';

const lock = new LockDB('service-id', { apiKey: 'api-key' });

// Check on a lock (optional)
const isReportLocked = await lock.check('report');
console.log(isReportLocked); // Outputs `false`

// Create a lock, returning if it was locked before
const wasReportLocked = await lock.lock('report');
console.log(isReportLocked); // Outputs `false`

// Unlock a lock, returning if it was locked before
const wasReportLockedBeforeUnlock = await lock.unlock('report');
console.log(wasReportLockedBeforeUnlock); // Outputs `true`

CLI

You can find binaries for your system in the latest release.

Here’s an example for Linux intel (x86_64), on downloading it with curl and moving it to /usr/local/bin/ so it’s available globally as lockdb:

# Download the binary from the latest release for your system and move it to `/usr/local/bin/`. Here's an example for most Linux OSes:
$ curl https://github.com/BrunoBernardino/lockdb/releases/latest/download/lockdb-linux-intel --output lockdb && sudo mv lockdb /usr/local/bin/

Then to use it, on any OS:

# Set ENV variables
$ export LOCKDB_SERVICE_ID="service-id"
$ export LOCKDB_API_KEY="api-key"

# Check on a lock
$ lockdb check report
false

# Create a lock, returning if it was locked before
$ lockdb lock report
false

# Unlock a lock, returning if it was locked before 
$ lockdb unlock report
true

Development

Requires deno@1.36.0 (other versions will probably work).

$ make format
$ make test

# CLI
$ deno run --allow-net mock_server.ts
$ deno run --allow-net --allow-env=LOCKDB_SERVICE_ID,LOCKDB_API_KEY,LOCKDB_SERVER_URL main.ts check report --server-url="http://127.0.0.1:5678" --service-id="service-identifier" --api-key="api-key"

Publishing

After committing and pushing, just run make publish VERSION=x.y.z. That will also trigger a new tag, build binaries, and a new draft release with them.