PageSpeed for Slackers

This will run an AWS Lambda function to collect Google PageSpeed information about a provided url and send it to a Slack channel through an incoming webhook.

Setup

Run npm install to install the project's dependencies.

The configuration is pulled through a file called config.json that must create in the root of the project with the following values:

{
  "pagespeed": {
    "goodScore": 80,       // minimum "good" score
    "warningScore": 60     // minimum "warning" score
  },
  "slack": {
    "channel": "#infrastructure",  // Slack room to post notifications to
    "incomingWebHook": "https://hooks.slack.com/services/xxxxxx/xxxxxx/xxxxxx"
  }
}

Testing Slack

You can run the following command to see if your messages will end up in Slack:

node test.js

Creating Zip File For Lamda

Once the app is working in the Testing Slack section, you can package up your app for uploading to Lambda with the following command:

npm run-script package

Trigging the Lambda Function

Originally, the intent was to watch S3 events and trigger the lambda function when the bucket content changes. However, the current limitation of not being able to filter viable events and throttling caused by too many events at the same time forced me to manually trigger the lambda function as an additional step of the build process.

aws lambda invoke --invocation-type RequestResponse \
                  --function-name YourLambdaFunctionName \
                  --region us-east-1 \
                  --payload '{"url": "http://example.com"}' \
                  YourLambdaFunctionName-output.txt