create-comment-perf.yml

# NOTE: This has read-write repo token and access to secrets, so this must
# not run any untrusted code.
# see: https://securitylab.github.com/research/github-actions-preventing-pwn-requests/
name: Comment with Perf diff on pull requests

on:
  workflow_run:
    workflows: ["Perf CI"]
    types:
      - completed

jobs:
  upload:
    runs-on: ubuntu-latest
    if: github.event.workflow_run.event == 'pull_request'
    steps:
      - name: 'Download artifact'
        uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea # v7.0.1
        with:
          script: |
            var artifacts = await github.rest.actions.listWorkflowRunArtifacts({
               owner: context.repo.owner,
               repo: context.repo.repo,
               run_id: ${{github.event.workflow_run.id }},
            });
            var matchArtifacts = artifacts.data.artifacts.filter((artifact) => {
              return artifact.name == "pr-perf"
            });
            if (!Array.isArray(matchArtifacts) || !matchArtifacts.length) {
              var process = require('process');
              process.exit();
            }
            var matchArtifact = matchArtifacts[0];
            var download = await github.rest.actions.downloadArtifact({
               owner: context.repo.owner,
               repo: context.repo.repo,
               artifact_id: matchArtifact.id,
               archive_format: 'zip',
            });
            var fs = require('fs');
            fs.writeFileSync('${{github.workspace}}/pr.zip', Buffer.from(download.data));

      - name: 'Unpack artifact'
        run: |
          if [ -f pr.zip ]; then
            unzip pr.zip
          fi

      - name: 'Comment on PR'
        uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea # v7.0.1
        with:
          github-token: ${{ secrets.GITHUB_TOKEN }}
          # Taken from https://github.com/actions/github-script/blob/main/.github/workflows/pull-request-test.yml
          script: |
            var fs = require('fs');
            if (!fs.existsSync('./NR')) {
              var process = require('process');
              process.exit();
            }
            var issue_number = Number(fs.readFileSync('./NR'));
            var comment_body = fs.readFileSync('./COMMENT');

            // Get the existing comments.
            const {data: comments} = await github.rest.issues.listComments({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: issue_number,
            });

            // Find any comment already made by the bot.
            const botComment = comments.find(comment => comment.user.id === 41898282 && comment.body.includes('# Perf diff from master'));

            if (botComment) {
              await github.rest.issues.updateComment({
                  owner: context.repo.owner,
                  repo: context.repo.repo,
                  comment_id: botComment.id,
                  body: comment_body.toString('utf8')
              });
            } else {
              await github.rest.issues.createComment({
                owner: context.repo.owner,
                repo: context.repo.repo,
                issue_number: issue_number,
                body: comment_body.toString('utf8')
              });
            }