Note: You could totally do this as a github action instead now, and you probably should.

pull_request_auto_labeler

Automatically label Github pull requests based on elements of the PR title. Default configuration expects Jira style ticket code(PROJ-100) in PR title

This labeler does the following:

• get all open Pull Requests for all the repositories for an organization/user
• check each PR to see if it has any matching a Jira style ticket code in the title (PROJ-100)
• apply a label to the Pull Request matching the uppercase version of the project codes from the title (PROJ)

Installation

If you want to run this as a cron, you can install from pypi with pip: pip install pull-request-auto-labeler

But if you're going to set this up as an AWS Lambda, you'll want the serverless.yaml, serverless-requirements.txt and handler.py so you might as well pull the source.

Setup

Set the following enviornment vars:

• [Required] GITHUB_API_TOKEN: A Github API Token which has access to read the repositories you want and modify pull requests. If you don't have one you see the guide here
• [Required] ORGANIZATION: the name of the github organization/username that you want to check PRs for.
• [Optional] LABEL_EXTRACTING_REGEX: Regex expression which will be applied on the PR title using python's re.findall.
  • This regex expression should have one matching group which returns the portion of the title which should be used as a label. i.e. if the regex finds PROJ-100, the matching group should be PROJ
  • Since we're using re.findall this can have multiple matches on the title, but each match must have only one group.
  • Default is \s*[\[]*([a-zA-Z0-9]{2,})[-|\s][0-9]+ which matches: PROJ-100, [PROJ-100], B2C-1, Proj 100.

Running from command line

python auto_labeler.py

Running as a Cron on AWS Lambda

For convenience I've included setup instructions to run this as a cron using aws lambda made easy by the serverless toolkit. If you haven't used serverless, I have a getting started with serverless guide here

Install serverless plugins

serverless-python-requirements

Its pretty annoying to add external requirements to a lambda when deploying manually. You have to build the wheels for the packages on an aws linux ami and include those in the zip that you upload. Luckily, there's a serverless plugin to make that all super easy.

sls plugin install -n serverless-python-requirements

Setup serverless for this project

• Copy the serverless.yaml, serverless-requirements.txt and handler.py files in this repo to wherever you're using this, or simply download this repo and use that as your source
• tweak any provider params you need to to match your setup
• Set the run frequency (update under functions>lambdaCron>events>schedule)

Deploy to AWS

sls deploy