slack-message-broker.yml

# This workflow is triggered whenever any of the workflows listed in on.workflow_run.workflows 
# has been cancelled or has failed, and will send a message to the specified Slack channel ids.
# TODO turn this into a standalone GitHub action so that it can be used in other repositories.
name: Slack Message Broker
on:
  workflow_run:
    workflows: [Script Evaluation Test, Benchmark, Build and Deploy to Github Pages]
    types: [completed, requested, in_progress]

jobs:
  slack-broker:
    runs-on: [ubuntu-latest]
    if: contains(fromJson('["cancelled", "failure"]'), github.event.workflow_job.status)
    steps:
      - name: Prepare Slack Message
        uses: actions/github-script@v6
        id: prepare-slack-message
        with:
          script: | 
            const name = "${{ github.event.workflow_job.name }}";
            const url = "${{ github.event.workflow_job.html_url }}";
            const status = "${{ github.event.workflow_job.status }}";
            const emojy = { failure: "❌", cancelled: "✋" }[status];
            const conclusion = "${{ github.event.workflow_job.conclusion }}";
            const action = "${{ github.event.action }}";
            const message = `${emojy} \`${name}\` *${action}* | *${status}* | *${conclusion}* 👉🏻 <${url}|view logs>`;
            core.setOutput("message", message); 

      - name: Notify Slack
        uses: slackapi/slack-github-action@v1.24.0
        with:
          channel-id: my-private-channel
          payload: |
            {
              "text": "${{ steps.prepare-slack-message.outputs.message }}",
              "blocks": [
                {
                  "type": "section",
                  "text": {
                    "type": "mrkdwn",
                    "text": "${{ steps.prepare-slack-message.outputs.message }}" 
                  }
                }
              ]
            }
        env:
          SLACK_BOT_TOKEN: ${{ secrets.SLACK_BOT_TOKEN }}