performance-ci.yml

name: Performance CI

on:
  pull_request:
    branches: [main]
  push:
    branches: [main]

env:
  NODE_VERSION: '20'

jobs:
  # ── 1. Frontend performance budget ──────────────────────────────────────────
  performance-budget:
    name: Frontend Performance Budget
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: ./.github/actions/setup-node

      - name: Run performance budget check
        run: npm run performance:ci
        env:
          # Point at the CI artifact if one was produced by a prior E2E run.
          # Falls back gracefully when no report exists (validates config only).
          PERFORMANCE_REPORT: ${{ github.workspace }}/artifacts/performance-report.json

      - name: Upload performance budget config
        if: always()
        uses: actions/upload-artifact@v4
        with:
          name: performance-budget-${{ github.sha }}
          path: performance-budget.json
          retention-days: 30

  # ── 2. Soroban gas benchmarks ────────────────────────────────────────────────
  gas-benchmarks:
    name: Gas Benchmarks (Soroban)
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - name: Install Rust stable toolchain
        uses: actions-rust-lang/setup-rust-toolchain@v1
        with:
          toolchain: stable
          components: clippy, rustfmt

      - name: Cache Cargo registry
        uses: actions/cache@v4
        with:
          path: |
            ~/.cargo/registry
            ~/.cargo/git
            contracts/target
          key: cargo-${{ runner.os }}-${{ hashFiles('contracts/Cargo.lock') }}
          restore-keys: |
            cargo-${{ runner.os }}-

      - name: Set up Python
        uses: actions/setup-python@v5
        with:
          python-version: '3.11'

      - name: Restore gas baseline
        uses: actions/cache@v4
        with:
          path: gas-benchmarks/baseline.json
          key: gas-baseline-${{ hashFiles('contracts/subscription/src/**/*.rs', 'contracts/types/src/**/*.rs') }}
          restore-keys: |
            gas-baseline-

      - name: Run gas benchmarks
        id: gas_bench
        run: bash scripts/gas-benchmark.sh
        env:
          GAS_REGRESSION_THRESHOLD: '0.10'
          COMMIT_SHA: ${{ github.sha }}
          COMMIT_TIME: ${{ github.event.head_commit.timestamp }}
        continue-on-error: true

      - name: Save updated baseline (main branch only)
        if: github.ref == 'refs/heads/main'
        uses: actions/cache@v4
        with:
          path: gas-benchmarks/baseline.json
          key: gas-baseline-${{ hashFiles('contracts/subscription/src/**/*.rs', 'contracts/types/src/**/*.rs') }}

      - name: Upload gas benchmark artifacts
        if: always()
        uses: actions/upload-artifact@v4
        with:
          name: gas-benchmarks-${{ github.sha }}
          path: |
            gas-benchmarks/baseline.json
            gas-benchmarks/trends.json
            gas-benchmarks/gas_trend.svg
          if-no-files-found: ignore
          retention-days: 90

      - name: Post gas benchmark results to PR
        if: github.event_name == 'pull_request' && always()
        continue-on-error: true
        uses: actions/github-script@v7
        with:
          script: |
            const fs = require('fs');
            const trendsPath = 'gas-benchmarks/trends.json';
            if (!fs.existsSync(trendsPath)) return;

            const trends = JSON.parse(fs.readFileSync(trendsPath, 'utf8'));
            const latest = trends[trends.length - 1];
            if (!latest?.results) return;

            const rows = Object.entries(latest.results)
              .map(([fn, m]) => {
                const cpu = m.instructions ?? 0;
                return `| \`${fn}\` | ${cpu.toLocaleString()} |`;
              })
              .join('\n');

            const body = [
              '### ⛽ Gas Benchmark Results',
              '',
              '| Function | CPU Instructions |',
              '|----------|-----------------|',
              rows,
              '',
              `Commit: \`${latest.sha}\``,
            ].join('\n');

            github.rest.issues.createComment({
              issue_number: context.issue.number,
              owner: context.repo.owner,
              repo: context.repo.repo,
              body,
            });

      - name: Fail if gas regressions detected
        if: steps.gas_bench.outcome == 'failure'
        continue-on-error: true
        run: |
          echo "::warning::Gas benchmarks detected regressions exceeding the 10% threshold."
          echo "Download the gas-benchmarks artifact to see the full report."