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πŸ§™β€β™€οΈ zero-config cloudflare workers application deployment using wrangler and github actions
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Latest commit 312aaae Dec 9, 2019

README.md

Wrangler GitHub Action

✨ Zero-config Cloudflare Workers deployment using Wrangler and GitHub Actions

Usage

Add wrangler-action to the workflow for your Workers application. The below example will publish your application on pushes to the master branch:

name: Deploy

on:
  push:
    branches:
      - master

jobs:
  deploy:
    runs-on: ubuntu-latest
    name: Deploy
    steps:
      - uses: actions/checkout@master
      - name: Publish
        uses: cloudflare/wrangler-action@1.1.0
        with:
          apiToken: ${{ secrets.CF_API_TOKEN }}

Authentication

You'll need to configure Wrangler using GitHub's Secrets feature - go to "Settings -> Secrets" and add your Cloudflare API token (for help finding this, see the Workers documentation). Your API token is encrypted by GitHub, and the action won't print it into logs, so it should be safe!

With your API token set as a secret for your repository, pass it to the action in the with block of your workflow. Below, I've set the secret name to CF_API_TOKEN:

jobs:
  deploy:
    name: Deploy
    steps:
      uses: cloudflare/wrangler-action@1.1.0
      with:
        apiToken: ${{ secrets.CF_API_TOKEN }}

wrangler-action also supports using your global API key and email as an authentication method, although API tokens are preferred. Pass in apiKey and email to the GitHub Action to use this method:

jobs:
  deploy:
    name: Deploy
    steps:
      uses: cloudflare/wrangler-action@1.1.0
      with:
        apiKey: ${{ secrets.CF_API_KEY }}
        email: ${{ secrets.CF_EMAIL }}

Configuration

If you're using Wrangler's environments feature, you can customize where the action deploys to by passing an environment in the with block of your workflow:

jobs:
  deploy:
    steps:
      uses: cloudflare/wrangler-action@1.1.0
      with:
        apiToken: ${{ secrets.CF_API_TOKEN }}
        environment: 'production'

If you need to install a specific version of Wrangler to use for deployment, you can also pass the input wranglerVersion to install a specific version of Wrangler from NPM. This should be a SemVer-style version number, such as 1.6.0:

jobs:
  deploy:
    steps:
      uses: cloudflare/wrangler-action@1.1.0
      with:
        apiToken: ${{ secrets.CF_API_TOKEN }}
        wranglerVersion: '1.6.0'

Optionally, you can also pass a workingDirectory key to the action. This will allow you to specify a subdirectory of the repo to run the Wrangler command from.

jobs:
  deploy:
    steps:
      uses: cloudflare/wrangler-action@1.1.0
      with:
        apiToken: ${{ secrets.CF_API_TOKEN }}
        workingDirectory: 'subfoldername'

Use cases

Deploying when commits are merged to master

The above workflow examples have already shown how to run wrangler-action when new commits are merged to the master branch. For most developers, this workflow will easily replace manual deploys and be a great first integration step with wrangler-action:

on:
  push:
    branches:
      - master

jobs:
  deploy:
    runs-on: ubuntu-latest
    name: Deploy
    steps:
      - uses: actions/checkout@master
      - name: Publish
        uses: cloudflare/wrangler-action@1.1.0
        with:
          apiToken: ${{ secrets.CF_API_TOKEN }}

Note that there are a number of possible events, like push, that can be used to trigger a workflow. For more details on the events available, check out the GitHub Actions documentation.

Deploying on a schedule

If you'd like to deploy your Workers application on a recurring basis – for instance, every hour, or daily – the schedule trigger allows you to use cron syntax to define a workflow schedule. The below example will deploy at the beginning of every hour:

on:
  schedule:
    - cron: '0 * * * *'

jobs:
  deploy:
    runs-on: ubuntu-latest
    name: Deploy
    steps:
      - uses: actions/checkout@master
      - name: Publish app
        uses: cloudflare/wrangler-action@1.1.0
        with:
          apiToken: ${{ secrets.CF_API_TOKEN }}

If you need help defining the correct cron syntax, check out crontab.guru, which provides a friendly user interface for validating your cron schedule.

Deploying on a "dispatched" event

If you need to trigger a deployment at-will, you can use GitHub's API to fire a repository_dispatch event on your repository. By setting your workflow to trigger on that event, you'll be able to deploy your application via an API call:

on:
  repository_dispatch:

jobs:
  deploy:
    runs-on: ubuntu-latest
    name: Deploy
    steps:
      - uses: actions/checkout@master
      - name: Publish app
        uses: cloudflare/wrangler-action@1.1.0
        with:
          apiToken: ${{ secrets.CF_API_TOKEN }}

To make the GitHub API request, you can deploy a custom Cloudflare Workers function, which will send a POST request to GitHub's API and trigger a new deploy:

const headers = {
  Accept: 'application/vnd.github.everest-preview+json',
  Authorization: 'Bearer $token',
}

const body = JSON.stringify({ event_type: 'repository_dispatch' })

const url = `https://api.github.com/repos/$owner/$repo/dispatches`

const handleRequest = async evt => {
  await fetch(url, { method: 'POST', headers, body })
  return new Response('OK')
}

addEventListener('fetch', handleRequest)

Note that $token in this code sample is a GitHub "Personal Access Token". For information on how to generate this token, see the GitHub documentation on "repository_dispatch".

Troubleshooting

This action is in beta, and I'm looking for folks to use it! If something goes wrong, please file an issue! That being said, there's a couple things you should know:

"I just started using Workers/Wrangler and I don't know what this is!"

No problem! Check out the Quick Start guide in our docs to get started. Once you have a Workers application, you may want to set it up to automatically deploy from GitHub whenever you change your project. That's where this action comes in - nice!

"I'm trying to deploy my static site but it isn't working!"

To deploy static sites and frontend applications to Workers, check out the documentation for Workers Sites.

Note that this action makes no assumptions about how your project is built! If you need to run a pre-publish step, like building your application, you need to specify a build step in your Workflow. For instance, if I have an NPM command called build, my workflow TOML might resemble the following:

jobs:
  deploy:
    runs-on: ubuntu-latest
    name: Deploy
    steps:
      - uses: actions/checkout@master
      - name: Build site
        run: 'npm run build'
      - name: Publish
        uses: cloudflare/wrangler-action@1.1.0
        with:
          apiToken: ${{ secrets.CF_API_TOKEN }}
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