# Benchmark libgit2 against the git reference implementation.
name: Benchmark

on:
  workflow_dispatch:
  schedule:
  - cron: '15 4 * * *'

permissions:
  contents: read

jobs:
  # Run our benchmarks. We build a matrix with the various build
  # targets and their details. Unlike our CI builds, we run these
  # directly on the VM instead of in containers since we do not
  # need the breadth of platform diversity.
  build:
    # Only run scheduled workflows on the main repository; prevents people
    # from using build minutes on their forks.
    if: github.repository == 'libgit2/libgit2'

    strategy:
      matrix:
        platform:
        - name: "Linux (clang, OpenSSL)"
          env:
            CC: clang
            CMAKE_OPTIONS: -DUSE_HTTPS=OpenSSL -DREGEX_BACKEND=builtin -DDEPRECATE_HARD=ON -DUSE_GSSAPI=ON -DBUILD_TESTS=OFF -DBUILD_EXAMPLES=OFF -DBUILD_CLI=ON -DCMAKE_BUILD_TYPE=Release
            CMAKE_BUILD_OPTIONS: --config Release
          id: linux
          os: ubuntu-latest
          setup-script: ubuntu
        - name: "macOS"
          os: macos-12
          env:
            CC: clang
            CMAKE_OPTIONS: -DREGEX_BACKEND=regcomp_l -DDEPRECATE_HARD=ON -DUSE_GSSAPI=ON -DBUILD_TESTS=OFF -DBUILD_EXAMPLES=OFF -DBUILD_CLI=ON -DCMAKE_BUILD_TYPE=Release
            CMAKE_BUILD_OPTIONS: --config Release
            PKG_CONFIG_PATH: /usr/local/opt/openssl/lib/pkgconfig
          id: macos
          setup-script: osx
        - name: "Windows (amd64, Visual Studio)"
          os: windows-2019
          env:
            ARCH: amd64
            CMAKE_GENERATOR: Visual Studio 16 2019
            CMAKE_OPTIONS: -A x64 -DDEPRECATE_HARD=ON -DBUILD_TESTS=OFF -DBUILD_EXAMPLES=OFF -DBUILD_CLI=ON -DCMAKE_BUILD_TYPE=Release
            CMAKE_BUILD_OPTIONS: --config Release
          id: windows
          setup-script: win32
      fail-fast: false
    name: "Benchmark ${{ matrix.platform.name }}"
    env: ${{ matrix.platform.env }}
    runs-on: ${{ matrix.platform.os }}
    steps:
    - name: Check out repository
      uses: actions/checkout@v4
      with:
        path: source
        fetch-depth: 0
    - name: Set up benchmark environment
      run: source/ci/setup-${{ matrix.platform.setup-script }}-benchmark.sh
      shell: bash
      if: matrix.platform.setup-script != ''
    - name: Build
      run: |
        mkdir build && cd build
        ../source/ci/build.sh
      shell: bash
    - name: Benchmark
      run: |
        if [[ "$(uname -s)" == MINGW* ]]; then
          GIT2_CLI="$(cygpath -w $(pwd))\\build\\Release\\git2"
        else
          GIT2_CLI="$(pwd)/build/git2"
        fi

        mkdir benchmark && cd benchmark
        ../source/tests/benchmarks/benchmark.sh --baseline-cli "git" --cli "${GIT2_CLI}" --name libgit2 --json benchmarks.json --zip benchmarks.zip
      shell: bash
    - name: Upload results
      uses: actions/upload-artifact@v4
      with:
        name: benchmark-${{ matrix.platform.id }}
        path: benchmark
      if: always()

  # Publish the results
  publish:
    name: Publish results
    needs: [ build ]
    if: ${{ always() && github.repository == 'libgit2/libgit2' }}
    runs-on: ubuntu-latest
    steps:
    - name: Check out benchmark repository
      uses: actions/checkout@v4
      with:
        repository: libgit2/benchmarks
        path: site
        fetch-depth: 0
        ssh-key: ${{ secrets.BENCHMARKS_PUBLISH_KEY }}
    - name: Download test results
      uses: actions/download-artifact@v4
    - name: Publish API
      run: |
       # Move today's benchmark run into the right place
       for platform in linux macos windows; do
         TIMESTAMP=$(jq .time.start < "benchmark-${platform}/benchmarks.json")
         TIMESTAMP_LEN=$(echo -n ${TIMESTAMP} | wc -c | xargs)
         DENOMINATOR=1
         if [ "${TIMESTAMP_LEN}" = "19" ]; then
           DENOMINATOR="1000000000"
         elif [ "${TIMESTAMP_LEN}" = "13" ]; then
           DENOMINATOR="1000"
         else
           echo "unknown timestamp"
           exit 1
         fi

         if [[ "$(uname -s)" == "Darwin" ]]; then
           DATE=$(date -R -r $(("${TIMESTAMP}/${DENOMINATOR}")) +"%Y-%m-%d")
         else
           DATE=$(date -d @$(("${TIMESTAMP}/${DENOMINATOR}")) +"%Y-%m-%d")
         fi

         mkdir -p "site/public/api/runs/${DATE}"
         cp "benchmark-${platform}/benchmarks.json" "site/public/api/runs/${DATE}/${platform}.json"
       done

       (cd site && node scripts/aggregate.js)

       (
        cd site &&
        git config user.name 'Benchmark Site Generation' &&
        git config user.email 'libgit2@users.noreply.github.com' &&
        git add . &&
        git commit --allow-empty -m"benchmark update ${DATE}" &&
        git push origin main
       )
      shell: bash