chrome-aws-lambda

Chromium Binary for AWS Lambda and Google Cloud Functions

Install

npm i chrome-aws-lambda

This will ship with appropriate binary for the latest stable release of puppeteer (usually updated within a day or two).

If you wish to install an older version of Chromium, take a look at Versioning.

Usage

The nodejs8.10 AWS Lambda runtime is required for this package to work properly.

const chromium = require('chrome-aws-lambda');
const puppeteer = require('puppeteer-core');

exports.handler = async (event, context) => {
  let result = null;
  let browser = null;

  try {
    browser = await puppeteer.launch({
      args: chromium.args,
      defaultViewport: chromium.defaultViewport,
      executablePath: await chromium.executablePath,
      headless: chromium.headless,
    });

    let page = await browser.newPage();

    await page.goto(event.url || 'https://example.com');

    result = await page.title();
  } catch (error) {
    return context.fail(error);
  } finally {
    if (browser !== null) {
      await browser.close();
    }
  }

  return context.succeed(result);
};

You should allocate at least 512 MB of RAM to your Lambda, 1600 MB is recommended.

API

Method / Property	Returns	Description
font(url)	{?Promise<string>}	Downloads a custom font and returns its basename.
args	{!Array<string>}	Provides a list of recommended additional Chromium flags.
defaultViewport	{!Object}	Returns more sensible default viewport settings.
executablePath	{?Promise<string>}	Returns the path where the Chromium binary was extracted.
headless	{!boolean}	Returns true if we are running on AWS Lambda or GCF.
puppeteer	{!Object}	Overloads puppeteer and returns the resolved package.

Fonts

Since version 1.12.2, the font() method will download additional fonts and make them discoverable.

To use it, simply pass a HTTPS URL to a custom font face before launching Chromium, e.g.:

await chromium.font('https://raw.githack.com/googlei18n/noto-emoji/master/fonts/NotoColorEmoji.ttf');

Fonts with the same basename will only be downloaded if they are not already cached.

On non-serverless environments, the font() method is a no-op to avoid polluting the user space.

It's recommended that you use a CDN, like raw.githack.com or gitcdn.xyz.

Overloading

Since version 1.7.0, it's also possible to overload puppeteer / puppeteer-core API with useful methods:

• Frame
  • count(selector)
  • exists(selector)
  • fill(form, data, heuristic = 'name')
  • number(selector, decimal = null, index = null, property = 'textContent')
  • selectByLabel(selector, ...values)
  • string(selector, property = 'textContent')
  • waitUntilVisible(selector, timeout = null)
  • waitWhileVisible(selector, timeout = null)
• Page
  • clickAndWaitForNavigation(selector, options = null)
  • count(selector)
  • exists(selector)
  • fill(form, data, heuristic = 'name')
  • go(url, options = null)
  • number(selector, decimal = null, index = null, property = 'textContent')
  • selectByLabel(selector, ...values)
  • string(selector, property = 'textContent')
  • waitUntilVisible(selector, timeout = null)
  • waitWhileVisible(selector, timeout = null)

Besides the public API, the following browser-context methods will also be available if Page.go() is used:

• σ.$(selector, context = document)
• σ.$$(selector, index = null, context = document)
• σ.$x(expression, index = null, context = document)
• σ.$number(data, decimal = null, index = null, property = 'textContent')
• σ.$string(data, property = 'textContent')
• σ.$regexp(data, pattern, index = null, property = 'textContent')

To enable overloading, simply call the puppeteer property exposed by this package.

Versioning

This package is versioned based on the underlying puppeteer minor version:

puppeteer Version	chrome-aws-lambda Version	Chromium Revision
1.14.*	npm i chrome-aws-lambda@1.14.0 --save-exact	641577 (75.0.3738.0)
1.13.*	npm i chrome-aws-lambda@1.13.0 --save-exact	637110 (74.0.3723.0)
1.12.*	npm i chrome-aws-lambda@1.12.2 --save-exact	624492 (73.0.3679.0)
1.11.*	npm i chrome-aws-lambda@1.11.2 --save-exact	609904 (72.0.3618.0)
1.10.*	npm i chrome-aws-lambda@1.10.1 --save-exact	604907 (72.0.3582.0)
1.9.*	npm i chrome-aws-lambda@1.9.1 --save-exact	594312 (71.0.3563.0)
1.8.*	npm i chrome-aws-lambda@1.8.0 --save-exact	588429 (71.0.3542.0)
1.7.*	npm i chrome-aws-lambda@1.7.0 --save-exact	579032 (70.0.3508.0)
1.6.*	npm i chrome-aws-lambda@1.6.2 --save-exact	575458 (69.0.3494.0)
1.5.*	npm i chrome-aws-lambda@1.5.0 --save-exact	564778 (69.0.3452.0)
1.4.*	npm i chrome-aws-lambda@1.4.0 --save-exact	555668 (68.0.3419.0)
1.3.*	npm i chrome-aws-lambda@1.3.0 --save-exact	549031 (67.0.3391.0)
1.2.*	npm i chrome-aws-lambda@1.2.0 --save-exact	543305 (67.0.3372.0)
1.1.*	npm i chrome-aws-lambda@1.1.0 --save-exact	536395 (66.0.3347.0)
1.0.*	npm i chrome-aws-lambda@1.0.0 --save-exact	526987 (65.0.3312.0)
0.13.*	npm i chrome-aws-lambda@0.13.0 --save-exact	515411 (64.0.3264.0)

Compiling

To compile your own version of Chromium check the Ansible playbook instructions.

AWS Lambda Layer

Lambda Layers is a new convenient way to manage common dependencies between different Lambda Functions.

The following set of (Linux) commands will create a well-structured layer of this package alongside puppeteer-core:

git clone --depth=1 https://github.com/alixaxel/chrome-aws-lambda.git && \
cd chrome-aws-lambda && \
brotli --decompress --rm bin/chromium-*.br && \
npm pack && \
mkdir -p nodejs/node_modules/chrome-aws-lambda/ && \
tar --directory nodejs/node_modules/chrome-aws-lambda/ --extract --file chrome-aws-lambda-*.tgz --strip-components=1 && \
rm chrome-aws-lambda-*.tgz && \
npm install puppeteer-core --no-bin-links --no-optional --no-package-lock --no-save --no-shrinkwrap --prefix nodejs/ && \
zip -9 --filesync --move --recurse-paths _/chrome-aws-lambda.zip nodejs/

The above will create a _/chrome-aws-lambda.zip file, which can be uploaded to your Layers console.

Google Cloud Functions

Since version 1.11.2, it's also possible to use this package on Google/Firebase Cloud Functions.

The only additional requirement is that iltorb must also be added as a dependency:

npm i iltorb

According to our benchmarks, it's 40% to 50% faster than using the off-the-shelf puppeteer bundle.

Compression

The Chromium binary is compressed using the Brotli algorithm.

This allows us to get the best compression ratio and faster decompression times.

File	Algorithm	Level	Bytes	MiB	%	Inflation
chromium	-	-	136964856	130.62	-	-
chromium.gz	Gzip	1	51662087	49.27	62.28%	1.035s
chromium.gz	Gzip	2	50438352	48.10	63.17%	1.016s
chromium.gz	Gzip	3	49428459	47.14	63.91%	0.968s
chromium.gz	Gzip	4	47873978	45.66	65.05%	0.950s
chromium.gz	Gzip	5	46929422	44.76	65.74%	0.938s
chromium.gz	Gzip	6	46522529	44.37	66.03%	0.919s
chromium.gz	Gzip	7	46406406	44.26	66.12%	0.917s
chromium.gz	Gzip	8	46297917	44.15	66.20%	0.916s
chromium.gz	Gzip	9	46270972	44.13	66.22%	0.968s
chromium.gz	Zopfli	10	45089161	43.00	67.08%	0.919s
chromium.gz	Zopfli	20	45085868	43.00	67.08%	0.919s
chromium.gz	Zopfli	30	45085003	43.00	67.08%	0.925s
chromium.gz	Zopfli	40	45084328	43.00	67.08%	0.921s
chromium.gz	Zopfli	50	45084098	43.00	67.08%	0.935s
chromium.br	Brotli	0	55401211	52.83	59.55%	0.778s
chromium.br	Brotli	1	54429523	51.91	60.26%	0.757s
chromium.br	Brotli	2	46436126	44.28	66.10%	0.659s
chromium.br	Brotli	3	46122033	43.99	66.33%	0.616s
chromium.br	Brotli	4	45050239	42.96	67.11%	0.692s
chromium.br	Brotli	5	40813510	38.92	70.20%	0.598s
chromium.br	Brotli	6	40116951	38.26	70.71%	0.601s
chromium.br	Brotli	7	39302281	37.48	71.30%	0.615s
chromium.br	Brotli	8	39038303	37.23	71.50%	0.668s
chromium.br	Brotli	9	38853994	37.05	71.63%	0.673s
chromium.br	Brotli	10	36090087	34.42	73.65%	0.765s
chromium.br	Brotli	11	34820408	33.21	74.58%	0.712s

For this reason, a stripped-down version of iltorb is bundled as a dependency.

License

MIT