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Dead-simple one-liner for clustered Node.js apps.
Forks N workers and creates new ones if they go down. Correctly handles signals from the OS.
const throng = require('throng')
throng(id => console.log(`Started worker ${id}`))
$ node example
Started worker 1
Started worker 2
Started worker 3
Started worker 4
$ npm install --save throng
throng(workerStartFunction)
throng({ worker: workerStartFunction, count: 3 })
throng({
master: masterStartFunction,
worker: workerStartFunction,
count: 16,
grace: 1000
})
(for cleaning up before disconnecting a worker on a SIGTERM, for instance)
throng({ worker })
function worker(id, disconnect) {
console.log(`Started worker ${id}`)
process.on('SIGTERM', () => {
console.log(`Worker ${id} exiting (cleanup here)`)
disconnect()
})
})
throng({
master: masterFn, // Fn to call in master process (can be async)
worker: workerFn, // Fn to call in cluster workers (can be async)
count: 4, // Number of workers (cpu count)
lifetime: Infinity, // Min time to keep cluster alive (ms)
grace: 5000, // Grace period between signal and hard shutdown (ms)
signals: ['SIGTERM', 'SIGINT'] // Signals that trigger a shutdown (proxied to workers)
})
const throng = require('throng')
throng({ master, worker, count: 4 })
// This will only be called once
function master() {
console.log('Started master')
process.once('beforeExit', () => {
console.log('Master cleanup.')
})
}
// This will be called four times
function worker(id, disconnect) {
console.log(`Started worker ${ id }`)
process.once('SIGTERM', shutdown)
process.once('SIGINT', shutdown)
function shutdown() {
console.log(`Worker ${ id } cleanup.`)
disconnect()
}
}
$ node example-complex.js
Started master
Started worker 1
Started worker 3
Started worker 2
Started worker 4
^C
Worker 1 cleanup.
Worker 3 cleanup.
Worker 2 cleanup.
Worker 4 cleanup.
Master cleanup.
Throng forks replacements for workers that crash so your cluster can continue working through failures.
$ node example-crashy.js
-1--2--3--4--2--1--3--4--crash!--1--3--4--crash!--5--3--4--6--5--3--4--crash!--6--crash!--crash!--7--6--8--9--7--6--8--9--crash!--7--6--9--10--7--6--9--10--crash!--7--9--10--11--7--crash!--9--crash!--7--12--9--13--crash!--12--9--crash!--crash!--crash!--14--crash!--12--15--crash!--14--18--15--19--14--18--15--crash!--19--14--crash!--15--20--14--21--15--20--14--21--15--20--14--21--15--20--14--21--15-
$ docker-compose run --rm dev
node@docker:/home/app$ npm test
FAQs
A simple worker-manager for clustered apps
The npm package throng receives a total of 39,281 weekly downloads. As such, throng popularity was classified as popular.
We found that throng demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
Did you know?
Socket for GitHub automatically highlights issues in each pull request and monitors the health of all your open source dependencies. Discover the contents of your packages and block harmful activity before you install or update your dependencies.
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