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Chaldeas

Chaldeas is a library that can automatically launch Chrome and Provide Devtools Protocol API in Headless mode at node.js

npm version Dependency Status

Dependency

Architecture

Example

Print Page PDF

$ yarn add --dev chaldeas
import { writeFile } from 'fs';
import Chaldeas from 'chaldeas';

async function main() {
  const chaldeas = Chaldeas.new();

  try {
    const protocol = await chaldeas.fetchProtocol();

    const { Page, Network } = protocol;
    await Promise.all([
      Page.enable(),
      Network.enable(),
    ]);

    await Page.navigate({ url: 'https://github.com' });

    await Page.loadEventFired(async () => {
      const result = await Page.printToPDF();
      const fileName = (new Date()).getTime();
      const buffer = Buffer.from(result.data, 'base64');
      writeFile(`${fileName}.pdf`, buffer, (e) => {
        if (e) {
          throw e;
        }
      });

      await chaldeas.terminate();
    });
  } catch (error) {
    await chaldeas.terminate();
    console.error(error);
  }
}

main();

Development

  1. install npm modules
    • $ yarn
      
  2. Docker

    • $ yarn chrome:launch
      $ docker attach chaldeas
      
      [email protected]:/data# ./node_modules/.bin/babel-node example/printPdf.js
      [email protected]:/data# ls
      1497018362340.pdf  LICENSE    example  node_modules  src             yarn.lock
      Dockerfile         README.md  lib      package.json  yarn-error.log
      

Contributing

Bug reports and pull requests are welcome :) on GitHub at https://github.com/teitei-tk/Chaldeas.

Reference

LICENSE

Apache License 2.0