Puppeteer Pool Manager

Urgent Request! Please update to 1.1.4 or latest version ASAP

There was an critical error in Threshold Watcher Layer that the Process Tree was not recursively inspected. From version 1.1.4, the issue has been resolved. If you see this Readme, please update the package as soon as possible. Also if you're using custom puppeteer-pool-config.json after update package upperthan 1.1.4 version, please re configure your custom config file.

Are you facing issue?

If there's no other related issue that you are facing in this list, please add issue. Then I'll discuss with you as fast as I can

Is there any default Puppeteer launch options that manager is using?

Yes. there are two default setting that maanger will use. If you want to change these default settings, please override these options.

executablePath: puppeteer.executablePath(),
headless: true,

Bootstrap issue handling in server runtime

Some servers may have trouble with puppeteer, Like session pool is not initializing or other similar cases. Follow these steps to resolve related issues.

1. Install system dependencies. Puppeteer requires several dependencies to execute.

sudo apt-get install -y libnss3 libatk1.0-0 libx11-xcb1 libxcomposite1 libasound2 libgtk-3-0

2. Install Chronium Browser

sudp apt-get install chromium-browser

which chronium-browser

3. Attach executable path

await bootPoolManager({
  args: ['--no-sandbox', '--disable-gpu', '--disable-setuid-sandbox'],
  executablePath: 'Default is puppteeer built in chromium',
});

Issue in ubuntu server, not boot strapped

You need to install dependencies to start chromium

sudo apt-get install -y \
    gconf-service \
    libasound2 \
    libatk1.0-0 \
    libc6 \
    libcairo2 \
    libcups2 \
    libdbus-1-3 \
    libexpat1 \
    libfontconfig1 \
    libgcc1 \
    libgconf-2-4 \
    libgdk-pixbuf2.0-0 \
    libglib2.0-0 \
    libgtk-3-0 \
    libnspr4 \
    libpango-1.0-0 \
    libpangocairo-1.0-0 \
    libstdc++6 \
    libx11-6 \
    libx11-xcb1 \
    libxcb1 \
    libxcomposite1 \
    libxcursor1 \
    libxdamage1 \
    libxext6 \
    libxfixes3 \
    libxi6 \
    libxrandr2 \
    libxrender1 \
    libxss1 \
    libxtst6 \
    ca-certificates \
    fonts-liberation \
    libappindicator1 \
    libnss3 \
    lsb-release \
    xdg-utils \
    wget \
    libgbm-dev

Install packages

• npm

  npm i @hoplin/puppeteer-pool
  

• yarn

  yarn add @hoplin/puppeteer-pool
  

• pnpm

  pnpm install @hoplin/puppeteer-pool
  

Go to

1. 🔧Pool Manager Config Docuemnt

2. 📖Pool Manager APIs Document

3. 😎Pool Manager Usage with Express.js Framework

Support

• Pool Managing
  • Puppeteer Level Pooling
  • Session Level Pooling
• Config
  • Support config customize
• Threshold Watcher
  • CPU
  • Memory
  • Support safe pool instance reset in runtime
• Metrics
  • Support Metric by pool
    • CPU usage of pool
    • Memory usage of pool
    • Managing session count in runtime
• Graceful Shutdown

Puppeteer Pool Manager Config

Default config should be puppeteer-pool-config.json in root directory path.

Default config setting

If config file are not given or invalid path, manager will use default defined configurations. Or if you want to pass config path, you can pass path to bootPoolManager function as parameter.

{
  "browser_pool": {
    "min": 2,
    "max": 5
  },
  "session_pool": {
    "min": 5,
    "max": 10,
    "width": 1080,
    "height": 1024,
    "ignoreResourceLoad": false,
    "enablePageCache": false
  },
  "threshold": {
    "activate": true,
    "interval": 5,
    "cpu": {
      "break": 80,
      "warn": 45,
    },
    "memory": {
      "break": 2048,
      "warn": 800,
    }
  }
}

browser_pool

• min: Minimum pool instance
• max: Maximum pool instance
  • Range Validation
    • max should be larger or equal than min
    • min should be larger or equal than 1
    • Both min and max should be integer

session_pool

• min: Minimum pool instance

• max: Maximum pool instance

  • Range Validation
    • max should be larger or equal than min
    • min should be larger or equal than 1
    • Both min and max should be integer
    • Both min and max does not allow negative number

• width: Browser width. Also set browser width and height if you need some acts like capturing screen or else.

  • Inteager Validation
    • width should be integer
    • width should be at least 50
    • width does not allow negative number

• height: Browser height. Also set browser width and height if you need some acts like capturing screen or else.

  • Inteager Validation
    • height should be integer
    • height should be at least 50
    • height does not allow negative number

• ignoreResourceLoad: Ignore resource load(This option makes ignore image, stylesheet, font assets request). If you set true, it will ignore resource load. This will increase performance but may occur some unintended behavior.

  • Boolean Validation
    • ignoreResourceLoad should be boolean

• enablePageCache: Enable page cache. If you set true, it will cache page. This will increase performance but may occur some unintended behavior.

  • Boolean Validation
    • enablePageCache should be boolean

threshold

• activate: Activate threshold or not
  • Boolean Validation
    • activate should be boolean
• interval: Interval of checking threshold
• cpu
  • break: CPU Usage break point. If CPU Usage is over this value, it will log status and reboot session manager puppeteer.
  • warn: CPU Usage warning point. If CPU Usage is over this value, it will log status.
    • Range Validation
      • break should be larger or equal than warn
      • warn should be larger or equal than 1
      • Both break and warn should be integer
      • Both break and warn does not allow negative number
• memory
  • break: Memory Usage break point. If Memory Usage is over this value, it will log and reboot session manager puppeteer.
  • warn: Memory Usage warning point. If Memory Usage is over this value, it will log status.
    • Range Validation
      • break should be larger or equal than warn
      • warn should be larger or equal than 100
      • Both break and warn should be integer
      • Both break and warn does not allow negative number

Puppeteer Pool Manager APIs

bootPoolManager(puppeteerOptions,poolConfigPath):Promise<void>

Boot pool manager. You need to invoke this function at least once to use another APIs

Parameter

• puppeteerOptions
  • PuppeteerLaunchOptions from puppeteer(Ref)
• poolConfigPath
  • string
  • Custom Puppeteer Pool config path. Default is project root's puppeteer-pool-config.json

rebootPoolManager():Promise<void>

Reboot pool manager. This api is not recommended to use. Using this API in runtime may occur unintended session control context break

controlSession(cb):Promise<any>

Return single session from pool. You need to pass callback function as parameter to use in session.

About Callback Function

Manager will pass session, which is Page type of puppeteer to callback function. This API will return result of callback function.

Parameter

• cb

  • sessionCallback

    // Session Callback type
    import { Page } from 'puppeteer';
    
    type sessionCallback<T> = (page: Page) => Promise<T>;

Return Value

• Return callback's return value

getPoolMetrics():Promise<Array<PoolMetrics>>

Return pool metrics. This includes pool id, pool CPU Usage, Memory Usage

Both CPU, Memory values returned are the recursive detection of the process tree in each single pool.

Return Value

[
  {
    Id: "ID of pool"
    CPU: "Percentage of CPU that Pool is using (System)",
    Memory: "Memory Usage of Memory that Pool is using. Unit is MB (System)",
    SessionPoolCount: "Session count that Pool is managing"
  }
]

Usage Example

Example of combining pool manager with Express Framework

import {
  bootPoolManager,
  controlSession,
  getPoolMetrics,
} from '@hoplin/puppeteer-pool';
import express, { Application } from 'express';

async function bootstrap() {
  // Initialize pool
  await bootPoolManager({Puppeteer Launch Options},'Puppeteer Pool Config Path');

  const server: Application = express();

  // Control Session example
  server.post('/', async (req, res) => {
    const url = req.body.url;

    // Get single session from pool
    const controlResponse = await controlSession(async (session) => {
      /**
       * Control session here
       */
      return; //(Some values)
    });
    return res.status(200).json({ result: controlResponse });
  });

  server.get('/metrics',async(req,res,) => {
    let puppeteerPoolMetrics = await getPoolMetrics();
    puppeteerPoolMetrics = puppeteerPoolMetrics.map((metrics) => {
        const id = `POOL_${metrics.Id}`;
        const cpu = `${metrics.CPU}%`;
        const memory =
          metrics.Memory > 1024
            ? `${parseFloat((metrics.Memory / 1024).toFixed(2))}GB`
            : `${metrics.Memory}MB`;
        const sessionPoolCount = metrics.SessionPoolCount;
        return { id, cpu, memory, sessionPoolCount };
      })
    return res.status(200).json({ result: puppeteerPoolMetrics })
  })

  server.get('/', async (req, res) => {
    const puppeteerPoolMetrics = await getPoolMetrics();
    return res.status(200).json(puppeteerPoolMetrics);
  });

  server.listen(3000, () => {
    logger.info(`Server listening on port 3000`);
  });
}