name: Load Test

on:
  pull_request:
    branches:
      - main
    types: [labeled]

jobs:
  trigger-load-test:
    if: ${{ github.event.label.name == 'pr/load-test' }}
    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v2
        with:
          ref: ${{ github.event.pull_request.head.sha }}
      - name: Trigger CircleCI Load Test Pipeline
        run: |
          # build json payload to trigger CircleCI Load Test Pipeline
          # This only runs the load test pipeline on the 'main' branch
          jsonData=$(jq --null-input -r --arg commit ${{ github.event.pull_request.head.sha }} \
            '{branch:"main", parameters: {"commit": $commit, "trigger-load-test": true}}')
          echo "Passing JSON data to CircleCI API: $jsonData"
          load_test_pipeline_id=$(curl -X POST \
               -H "Circle-Token: ${{ secrets.CIRCLE_TOKEN }}" \
               -H "Content-Type: application/json" \
               -d "$jsonData" \
              "https://circleci.com/api/v2/project/gh/${GITHUB_REPOSITORY}/pipeline" | jq -r '.id')
          echo "LOAD_TEST_PIPELINE_ID=$load_test_pipeline_id" >> $GITHUB_ENV
      - name: Post Load Test URL to PR
        env:
          PR_COMMENT_URL: ${{ github.event.pull_request.comments_url }}
        run: |
          echo "LOAD_TEST_PIPELINE_ID is: $LOAD_TEST_PIPELINE_ID"
          # get load-test workflow
          workflow=
          # wait up to a minute for load-test workflow to start
          until [ $SECONDS -ge 60 ] && exit 1; do
            workflow=$(curl -s -X GET \
                -H "Circle-Token: ${{ secrets.CIRCLE_TOKEN }}" \
                -H "Content-Type: application/json" \
                "https://circleci.com/api/v2/pipeline/${LOAD_TEST_PIPELINE_ID}/workflow" | jq '.items[] | select(.name=="load-test")')
            # if we found a workflow we exit
            if [ -n "$workflow" ]; then
              break
            fi
            echo -n "."
            sleep 5
          done
          echo "$workflow"
          # get pipeline number
          pipeline_number=$(echo "$workflow" | jq -r '.pipeline_number')
          # get workflow id
          workflow_id=$(echo "$workflow" | jq -r '.id')
          # get project slug
          project_slug=$(echo "$workflow" | jq -r '.project_slug')
          # build load test URL
          load_test_url="https://app.circleci.com/pipelines/${project_slug}/${pipeline_number}/workflows/${workflow_id}"
          # comment URL to pull request
          curl -X POST \
               -H "Authorization: token ${{ secrets.PR_COMMENT_TOKEN }}" \
               -H "Content-Type: application/json" \
               -d "{\"body\": \"Load Test Pipeline Started at: $load_test_url\"}" \
              "$PR_COMMENT_URL"