JavaScript Cloud Native Development Cookbook

How to do it...

1. Create the project from the following template:

$ sls create --template-url https://github.com/danteinc/js-cloud-native-cookbook/tree/master/ch7/event-metrics --path cncb-event-metrics

2. Navigate to the cncb-event-metrics directory with cd cncb-event-metrics.
3. Review the file named serverless.yml.
4. Review the file named handler.js with the following content:

module.exports.listener = (event, context, cb) => {  _(event.Records)    .map(recordToUow)    .tap(count)    ...    .collect().toCallback(cb);};const count = (uow) => {  const tags = [    `account:${process.env.ACCOUNT_NAME}`,    `region:${uow.record.awsRegion}`,    `stream:${uow.record.eventSourceARN.split('/')[1]}`,    `shard:${uow.record.eventID.split('-')[1].split(':')[0]}`, `source:${uow.event.tags ...