action.yml

name: "Svix Proxy"
description: "Use Svix proxy to tunnel publicly accessible URL to action runner port"

branding:
  icon: "activity"
  color: "gray-dark"

inputs:
  port:
    description: "Local port to proxy traffic to"
    required: true
  path:
    description: "Specify an HTTP path on the local service"
    required: false
    default: /
  logging:
    description: "Enable postback logs (logs a URL you can visit to view requests proxied)"
    required: false
    default: false

outputs:
  postback_url:
    description: "URL the proxy is publicly available on"
    value: ${{ steps.proxy.outputs.postback_url }}

runs:
  using: "composite"
  steps:
    - run: wget https://github.com/svix/svix-cli/releases/download/v0.19.0/svix_0.19.0_linux_amd64.deb
      shell: bash
    - run: sudo dpkg -i svix_0.19.0_linux_amd64.deb
      shell: bash
    - run: sudo apt-get update && sudo apt-get install colorized-logs # this is to strip ansi chars from svix stdout
      shell: bash
    - name: Start Svix proxy
      id: proxy
      shell: bash
      run: |
        # Start the svix command in the background so once this step finishes, svix will still be running in the action runner instance for the next step to use the callback_url output
        LOG_FILE="/tmp/svix.log"
        touch $LOG_FILE 
        if [ "${{ inputs.logging }}" = true ]; then
          svix listen http://localhost:${{ inputs.port }}${{ inputs.path }} >"$LOG_FILE" &
        else
          svix listen http://localhost:${{ inputs.port }}${{ inputs.path }} --no-logging >"$LOG_FILE" &
        fi

        # Watch Svix logs for 15 seconds
        timeout=15
        SECONDS=0
        # Check logs until timeout
        echo "Waiting for proxy postback URL..."
        while [ $SECONDS -lt $timeout ]; do
         # return true in grep so that it doesn't return 1 and close the script when no match is found
         postback_url=$(ansi2txt <"$LOG_FILE"| grep "https://play.svix.com/in/" || true)
         if [ -n "$postback_url" ]; then
          # Found postback URL 
          echo "postback_url=$postback_url" >>"$GITHUB_OUTPUT"
          # echo the CLI stdout
          ansi2txt <"$LOG_FILE"
          exit 0
         fi
          sleep 1
          echo "Waiting for proxy postback URL..."
        done

        echo "Timeout reached, no postback URL found"
        exit 1