Schedule Change

Microservice to fetch speedrunning events schedule and notify changes to Discord webhook. Made for language restreamers.

Written in TypeScript. Run yarn build to transpile to JavaScript.

This app is designed to be used with AWS Lambda with Serverless Framework.

Deploy to AWS Lambda

First setup JSON config file in config directory. Refer to template.json. File name must be Serverless' stage.

Then deploy with

$ sls deploy -s [development/staging/production/etc]

Invoke

It runs every 6 minutes by default, but you can manually invoke the function.

$ sls invoke (local) -f run -s MYEVENT2050

Adding local lets you run the function on your local machine instead of actual AWS Lambda instances.

Adding custom notifier

Please refer to what's inside src/esa2018-one as well.

This service is devided into 3 main stages.

• Fetcher: Fetch and parse into data format that is useful for the rest of the logic.
• Comparer: Compare with last schedule and get diff
• Formatter: Format the diff into human-readable string

Each stage is represented by functions that takes the data from previous stage as arguments.

In src/example-event.ts,

import {scheduleChange} from '../lib';

export default () => {
	scheduleChange(
		'example-event',
		new URL('https://example.com/schedule'),
		(rawData) => parseRawData(rawData),
		(lastFetchedSchedule, latestSchedule) =>
			compareThem(lastFetchedSchedule, latestSchedule),
		(compareResult) => formatThem(compareResult)
	)
}

The scheduleChange funtion is strongly typed with generics, allowing to define each function freely and safely.

Then register this function in serverless.yml.

functions:
  example-event:
    handler: build/example-event.default
    events:
      - schedule: cron(0/6 * * * ? *)
      # or any other events to invoke this function (like Discord command)

Now you can deploy to have your custom schedule change notifier!