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Run Google Lighthouse audits in AWS Lambda

Google Lighthouse is cool but do you know what's even cooler? Running them in Lambda.

Setup

The Lambda setup is done via the Serverless framework so make sure we have that installed.

npm install -g serverless

Next you'll need to clone and install this repo

git clone https://github.com/SamStenton/lighthouse-lambda
cd lighthouse-lambda
npm install

This installs the Google Lighthouse package along with the serverless chrome plugin.

While installing you'll need to edit your config.yml file.

reportBucket: 'nameOfTheBucketYouWantToCreate' 

...

Access Keys

In order to connect to AWS services you'll need to create some access keys. To do this follow the guide on the serverless docs.

Deployment

Once you have setup access to your AWS account deployment is easy via the serverless framework.

serverless deploy

This will create a CloudFormation Template and create:

  • Lambda Main
  • Lambda Lighthouse
  • S3 Report Bucket

Once complete you'll get output detailing your new stack.

If you wish to reverse the above command and remove your functions and bucket simply run

serverless remove

Usage

Once your deploy command has completed you'll be given output defining what your endpoints are.

https://randomletters.execute-api.eu-west-1.amazonaws.com/dev/check

To run a report add a url parameter to the end of the endpoint with the website you would like to test.

?url=https://pwa.rocks

Your response will look like the following:

{
"key": "pwa.rocks/test_1543789776367.html",
"url": "//yourbucket/pwa.rocks/test_1543789776367.html",
"message": "Your report will be live in ~60 seconds"
}

After about 30 seconds your report will be available at the url provided in the response.

Todo

  • Allow authorization headers to be added the Lighthouse request
  • Add nice S3 index and 404 templates
  • Provide the raw report data