perf-canary.yml

name: Perf Canary

# Lightweight per-PR build-time regression gate for PRs that touch the
# extractor, graph-builder, or native Rust layers — the parts of the codebase
# that caused the v3.12.0 regressions (+1827% 1-file rebuild, +98% full build).
#
# Only the incremental-benchmark suite is run (full build + no-op + 1-file
# rebuild for both engines). The regression guard uses BENCH_CANARY=1 mode,
# which applies a 50% threshold instead of the full suite's 25% — enough
# to catch catastrophic regressions while tolerating CI runner variance.
#
# This is intentionally separate from the full pre-publish-benchmark job in
# ci.yml, which runs unconditionally on every PR and measures the complete
# suite. The canary completes in roughly 5–10 minutes; the full suite takes
# 20–60 minutes.

on:
  pull_request:
    paths:
      - "src/extractors/**"
      - "src/domain/graph/**"
      - "crates/**"
      - "scripts/benchmark.ts"
      - "scripts/incremental-benchmark.ts"
      - "scripts/lib/bench-config.ts"
      - "scripts/lib/fork-engine.ts"

concurrency:
  group: perf-canary-${{ github.ref }}
  cancel-in-progress: true

jobs:
  perf-canary:
    name: Perf canary (incremental tiers)
    runs-on: ubuntu-latest
    env:
      CODEGRAPH_FAST_SKIP_DIAG: "1"

    steps:
      - uses: actions/checkout@v6
        with:
          fetch-depth: 0

      - uses: actions/setup-node@v6
        with:
          node-version: "22"
          cache: "npm"

      - name: Setup Rust
        uses: dtolnay/rust-toolchain@stable

      - name: Rust cache
        uses: Swatinem/rust-cache@v2
        with:
          workspaces: crates/codegraph-core

      - name: Install napi-rs CLI
        timeout-minutes: 5
        run: npm install -g @napi-rs/cli@3

      - name: Build native addon
        working-directory: crates/codegraph-core
        run: napi build --release

      - name: Install dependencies
        timeout-minutes: 20
        shell: bash
        run: |
          for attempt in 1 2 3; do
            npm install && break
            if [ "$attempt" -lt 3 ]; then
              echo "::warning::npm install attempt $attempt failed, retrying in 15s..."
              sleep 15
            else
              echo "::error::npm install failed after 3 attempts"
              exit 1
            fi
          done

      - name: Install native addon over published binary
        run: node scripts/ci-install-native.mjs

      # Build dist/ so benchmarks load the same compiled JS that ships to npm,
      # matching the methodology used by the full pre-publish-benchmark gate.
      - name: Build TypeScript
        run: npm run build

      - name: Run incremental benchmark
        timeout-minutes: 15
        run: |
          STRIP_FLAG=$(node -e "const [M]=process.versions.node.split('.').map(Number); console.log(M>=23?'--strip-types':'--experimental-strip-types')")
          node $STRIP_FLAG --import ./scripts/ts-resolve-loader.js scripts/incremental-benchmark.ts --version dev --dist > incremental-canary-result.json

      - name: Update incremental report
        run: |
          STRIP_FLAG=$(node -e "const [M]=process.versions.node.split('.').map(Number); console.log(M>=23?'--strip-types':'--experimental-strip-types')")
          node $STRIP_FLAG scripts/update-incremental-report.ts incremental-canary-result.json

      - name: Regression guard (50% threshold)
        env:
          RUN_REGRESSION_GUARD: "1"
          BENCH_CANARY: "1"
        run: npm run test:regression-guard

      - name: Upload canary result
        if: always()
        uses: actions/upload-artifact@v7
        with:
          name: incremental-canary-result
          path: incremental-canary-result.json
          if-no-files-found: warn