JSPM

Puppeteer Pool

Puppeteer browser instance pooling via generic-pool

Installation

# NPM:
npm i @invertase/puppeteer-pool
# YARN:
yarn add @invertase/puppeteer-pool

Usage

Import

const createPuppeteerPool = require('@invertase/puppeteer-pool');

Create a pool

const pool = createPuppeteerPool({
  min: 2,
  max: 10,
  puppeteerLaunchArgs: [{ headless: false }],
});

Options

• validate: A function to validate an instance prior to use, must return a promise that resolves true or false
• puppeteerLaunchArgs: Array of arguments to pass to puppeteer.launch when instances are created

Options provided by generic-pool:

• max: maximum number of resources to create at any given time. (default=1)
• min: minimum number of resources to keep in pool at any given time. If this is set >= max, the pool will silently set the min to equal max. (default=0)
• maxWaitingClients: maximum number of queued requests allowed, additional acquire calls will be callback with an err in a future cycle of the event loop.
• testOnBorrow: boolean: should the pool validate resources before giving them to clients.
• acquireTimeoutMillis: max milliseconds an acquire call will wait for a resource before timing out. (default no limit), if supplied should non-zero positive integer.
• fifo : if true the oldest resources will be first to be allocated. If false the most recently released resources will be the first to be allocated. This in effect turns the pool's behaviour from a queue into a stack. boolean, (default true)
• priorityRange: int between 1 and x - if set, borrowers can specify their relative priority in the queue if no resources are available.
• autostart: boolean, should the pool start creating resources, initialize the evictor, etc once the constructor is called. If false, the pool can be started by calling pool.start, otherwise the first call to acquire will start the pool. (default true)
• evictionRunIntervalMillis: How often to run eviction checks. Default: 0 (does not run).
• numTestsPerEvictionRun: Number of resources to check each eviction run. Default: 3.
• softIdleTimeoutMillis: amount of time an object may sit idle in the pool before it is eligible for eviction by the idle object evictor (if any), with the extra condition that at least "min idle" object instances remain in the pool. Default -1 (nothing can get evicted)
• idleTimeoutMillis: the minimum amount of time that an object may sit idle in the pool before it is eligible for eviction due to idle time. Supersedes softIdleTimeoutMillis Default: 30000
• Promise: Promise lib, a Promises/A+ implementation that the pool should use. Defaults to whatever global.Promise is (usually native promises).

Acquire a browser instance

const browserInstance = await pool.acquire();

Release a browser instance

const browserInstance = await pool.acquire();
// do something with your instance,
// when you're finished with the instance; call release:
await pool.release(browserInstance);

Drain and clear the pool

await pool.drain();
await pool.clear();

License

See LICENSE