Herald — Yielding Messages (for Languages) from Upon High

This application exists to empower Language Owners of new releases for their respective languages and supporting libraries.

The notification system is comprised of a few different layers:

1. Scraping various "sources of truth" over the internet for release information (provided via buildpacks as standard Linux executables)
2. Presenting this information to the Language Owners
3. Notifying them, via GitHub Issues, when a new release has been made.

All languages, except Node.js, should benefit greatly from this system.

This system is written in the Go programming language.

Relevant Links

• heroku-herald GitHub profile

Add a Check to Herald

Herald assumes that you have a buildpack in a git repo that contains a versions branch, and in that versions branch there is a versions folder. In that folder it will look for executables. For example in the Ruby buildpack https://github.com/heroku/heroku-buildpack-ruby/tree/versions/versions.

When the executable is run, it should print out all available version numbers — one per line. For example in the Ruby buildpack:

$ versions/ruby
2.5.1
2.4.4
2.3.7
2.2.10
2.6.0-preview1
#...

Once every 15 minutes the herald/cmd/version-scraper/main.go script will execute against all buildpacks and record the result in Redis. When it is detected that there is a new entry, then a new issue will be opened up on that buildpack.

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Boostrapping Locally

Install dep:

$ go get -u github.com/golang/dep/cmd/dep

Then, checkout this repository and resolve it's dependencies:

$ dep ensure

That's it!