Install hosted GitHub App

Pullsize

Mark pull request size as label, hosted on Cloudflare worker.

Features

• Basically a port of microsoft/PullRequestQuantifier to CloudFlare worker
• Mark PR size base on the diff size (lines added + lines deleted) as label
• Configurable per repo: See configuration for details
• Runs on CloudFlare worker, within free plan usage limit
• Easy to host yourself

Example PR: #10

Here are non-goals for this project:

• Semantic diff (Like difftastic). That is too expensive to run and does not compile to wasm for using in CloudFlare worker

Installation (Hosted)

Install via here: https://github.com/apps/pullsize

Note

GitHub Enterprise Server is not supported yet

Note that this hosted version is provided in best effort bases. It might break or goes away without prior notice.

This is hosted on CloudFlare worker free plan. If this got too much traffic or the PR is too large, the bot will stop working. I don't plan to pay for hosting this bot. If you have a large amount of request, host it yourself.

Also this bot will access PR diff and repository content for the config file, it is pretty powerful and might be uncomfortable for organizations. It is recommended to host this bot yourself: It just needs a CloudFlare account on worker free plan and a few setup steps.

Configuration file

Configuration file is stored in the repository's .github/prsize.toml in toml format. If this file does not exist, we will use the default configuration specified in config.ts, DEFAULT_CONFIG variable.

Pullsize will be reading the config from the base branch of the PR. So if your PR is updating the config, the new config will get applied on that PR.

This is an annotated toml configuration. Note that the content is for example only and not the default content.

# List of glob for ignoring files
ignore = [
  "*.md",
  ".yarn/*",
]

# Represent a label pullsize might apply.
# Each label must have all `name`, `color` and `threshold` fields
[[labels]]
name = "size/large" # Name of the label
color = "ff0000"    # Color of the label in GitHub
threshold = 100     # Minimum changes amount for this applying this label
                    # If there is other label with a higher threshold, that label will get applied.

[[labels]]
name = "size/small"
color = "ff0000"
threshold = 0 # Add a threshold=0 for smallest label

Deployment (self hosting)

This means forking this repository and host the bot within your CloudFlare account. Most likely, restricting the github app to only be available in the organization.

Step 1: Initial deploy

We will use github action to deploy this app into CloudFlare.

1. Fork this repository
2. Create a CloudFlare account if you don't have one yet
3. Create a cloudflare API token following this guide: https://developers.cloudflare.com/fundamentals/api/get-started/create-token/ Use "Edit Cloudflare Workers" for the API token template for permission sets. Stash the API token to somewhere.
4. Go to "Workers & Pages" -> "Overview". Copy the "Account ID" on the right.
5. Go to Github. In the forked repository, go to settings -> "Secrets and variables" -> "Actions". Add following repository secrets:
   • CLOUDFLARE_ACCOUNT_ID: Account ID from "Workers & Pages" dashboard
   • CLOUDFLARE_API_TOKEN: API token for cloudflare we just created
6. Run "Deploy cloudflare" action again. It should have failed before we setup the secrets. This should deploy the worker for the first time.
7. In Cloudflare dashboard -> "Workers & Pages" -> "Overview" -> "Pullsize". Copy the URL that ends with .workers.dev. This is your worker domain

Step 2: Create a GitHub app

Check github documentation for creating a github apps: https://docs.github.com/en/apps/creating-github-apps/registering-a-github-app/registering-a-github-app

• Callback URL: Leave it empty
• Set up URL: Leave it empty
• Webhook: Active
• Webhook URL: https://<worker_domain>/github/webhook, where <worker_domain> is get from the cloudflare dashboard.
• Webhook secret: Generate a random string and save it up
• Repository permissions:
  • Contents: Read-only
  • Issues: Read and write
  • Pull requests: Read and write
• Subscribe to events: "Pull request"

Step 3: Create private keys and collect GitHub apps information

1. Edit the GitHub apps
2. Copy GitHub app ID and store somewhere
3. Generate a private key and download it in the app. See https://docs.github.com/en/apps/creating-github-apps/authenticating-with-a-github-app/managing-private-keys-for-github-apps for details
4. Convert the key from PKCS#1 into PKCS#8 format with following command:

   openssl pkcs8 -topk8 -inform PEM -outform PEM -nocrypt -in private-key.pem -out private-key-pkcs8.key

   https://github.com/octokit/auth-app.js/?tab=readme-ov-file#standalone-usage

Step 4: Update CloudFlare worker variables

In CloudFlare dashboard, "Workers & Pages" -> "Overview" -> "Pullsize" -> "Settings". Fill in following variables:

• GH_APP_ID: Github App ID. Should be a number
• GH_PRIVATE_KEY: Content of PKCS#8 format PEM key. Should be starting with -----BEGIN PRIVATE KEY-----
• GH_WEBHOOK_SECRET: Webhook secret chosen when creating the Github app
• SENTRY_DSN: Optionally, set the sentry.io DSN for error reporting

All variables must be encrypted.

Step 5: Update for new change

If there is any new changes in upstream, sync the fork and github action should deploy the new version automatically to cloudflare.

License

MIT