name: PR Benchmark (Rust Router)

on:
  push:
    branches: [ main ]
    paths:
      - "sgl-router/**"
  pull_request:
    branches: [ main ]
    paths:
      - "sgl-router/**"
  workflow_dispatch:

concurrency:
  group: pr-benchmark-rust-${{ github.ref }}
  cancel-in-progress: true
permissions:
  contents: read
  pull-requests: write
  issues: write
jobs:
  benchmark-router:
    if: github.repository == 'sgl-project/sglang' || github.event_name == 'pull_request'
    runs-on: ubuntu-latest
    steps:
      - name: Checkout code
        uses: actions/checkout@v4
        with:
          # Fetch enough history for baseline comparison
          fetch-depth: 100

      - name: Install dependencies
        run: |
          bash scripts/ci_install_rust.sh

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

      - name: Build router in release mode
        run: |
          source "$HOME/.cargo/env"
          cd sgl-router/
          cargo build --release

      - name: Run quick benchmarks
        timeout-minutes: 15
        run: |
          source "$HOME/.cargo/env"
          cd sgl-router/
          # Run quick benchmarks for PR validation using Python script
          python3 scripts/run_benchmarks.py --quick --validate-thresholds --save-results

      - name: Upload benchmark results
        if: always()
        uses: actions/upload-artifact@v4
        with:
          name: benchmark-results-${{ github.sha }}
          path: |
            sgl-router/target/criterion/
          retention-days: 30

      - name: Post benchmark results as PR comment
        if: github.event_name == 'pull_request'
        run: |
          cd sgl-router/
          # Use Python script to post benchmark comment
          python3 scripts/post_benchmark_comment.py \
            --pr-number ${{ github.event.number }} \
            --commit-sha ${{ github.sha }} \
            --results-file benchmark_results.env
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

  benchmark-integration-test:
    if: github.repository == 'sgl-project/sglang' || github.event_name == 'pull_request'
    runs-on: ubuntu-latest
    steps:
      - name: Checkout code
        uses: actions/checkout@v4

      - name: Install dependencies
        run: |
          bash scripts/ci_install_rust.sh

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

      - name: Run benchmark integration tests
        timeout-minutes: 10
        run: |
          source "$HOME/.cargo/env"
          cd sgl-router/
          # Run integration tests to ensure benchmark code compiles and works
          cargo test --test benchmark_integration

      - name: Verify benchmark compilation
        run: |
          source "$HOME/.cargo/env"
          cd sgl-router/
          # Ensure all benchmarks compile without running them
          cargo check --benches
