ci-stress.yml

name: CI Stress

on:
  workflow_dispatch:
    inputs:
      iterations:
        description: "Total iterations to run (split across shards)"
        required: true
        default: "100"
        type: string
      target:
        description: "Which test suite(s) to stress"
        required: true
        default: "both"
        type: choice
        options:
          - unit
          - selftests
          - both
      shards:
        description: "Number of parallel runners (iterations are divided across shards)"
        required: true
        default: "20"
        type: string

jobs:
  plan:
    name: Plan shards
    runs-on: ubuntu-latest
    outputs:
      shard-list: ${{ steps.shards.outputs.list }}
      per-shard: ${{ steps.shards.outputs.per-shard }}
      remainder: ${{ steps.shards.outputs.remainder }}
    steps:
      - id: shards
        env:
          ITERS: ${{ inputs.iterations }}
          SHARDS: ${{ inputs.shards }}
        run: |
          set -euo pipefail
          if ! [[ "$ITERS" =~ ^[0-9]+$ ]] || [ "$ITERS" -lt 1 ]; then
            echo "iterations must be a positive integer; got '$ITERS'" >&2
            exit 1
          fi
          if ! [[ "$SHARDS" =~ ^[0-9]+$ ]] || [ "$SHARDS" -lt 1 ] || [ "$SHARDS" -gt 256 ]; then
            echo "shards must be 1..256; got '$SHARDS'" >&2
            exit 1
          fi
          if [ "$SHARDS" -gt "$ITERS" ]; then
            SHARDS="$ITERS"
          fi
          per=$(( ITERS / SHARDS ))
          rem=$(( ITERS % SHARDS ))
          list=$(seq 1 "$SHARDS" | jq -R -s -c 'split("\n") | map(select(length>0) | tonumber)')
          echo "list=$list" >> "$GITHUB_OUTPUT"
          echo "per-shard=$per" >> "$GITHUB_OUTPUT"
          echo "remainder=$rem" >> "$GITHUB_OUTPUT"
          echo "Plan: $ITERS iterations across $SHARDS shards (~$per each, +1 for first $rem)"

  unit-tests:
    name: Unit (shard ${{ matrix.shard }})
    needs: plan
    if: ${{ inputs.target == 'unit' || inputs.target == 'both' }}
    runs-on: windows-latest
    timeout-minutes: 350
    strategy:
      fail-fast: false
      matrix:
        shard: ${{ fromJSON(needs.plan.outputs.shard-list) }}
    steps:
      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2

      - name: Setup .NET
        uses: actions/setup-dotnet@c2fa09f4bde5ebb9d1777cf28262a3eb3db3ced7 # v5.2.0
        with:
          dotnet-version: 10.0.x

      - name: Restore
        run: dotnet restore tests/Reactor.Tests/Reactor.Tests.csproj -p:Platform=x64

      - name: Build (once)
        run: dotnet build tests/Reactor.Tests/Reactor.Tests.csproj --no-restore --configuration Debug -p:Platform=x64

      - name: Stress loop
        shell: pwsh
        env:
          PER_SHARD: ${{ needs.plan.outputs.per-shard }}
          REMAINDER: ${{ needs.plan.outputs.remainder }}
          SHARD_INDEX: ${{ matrix.shard }}
        run: |
          $per = [int]$env:PER_SHARD
          $rem = [int]$env:REMAINDER
          $idx = [int]$env:SHARD_INDEX
          $count = if ($idx -le $rem) { $per + 1 } else { $per }
          if ($count -lt 1) { Write-Host "Shard $idx has no work."; exit 0 }
          $failures = New-Object System.Collections.Generic.List[int]
          for ($i = 1; $i -le $count; $i++) {
            Write-Host "::group::Unit iteration $i / $count (shard $idx)"
            dotnet test tests/Reactor.Tests/Reactor.Tests.csproj --no-restore --no-build -p:Platform=x64 --logger "console;verbosity=normal"
            $code = $LASTEXITCODE
            Write-Host "::endgroup::"
            if ($code -ne 0) {
              Write-Host "::warning::Unit iteration $i (shard $idx) failed with exit $code"
              $failures.Add($i) | Out-Null
            }
          }
          if ($failures.Count -gt 0) {
            Write-Host "::error::Shard $idx had $($failures.Count) failed iteration(s): $($failures -join ', ')"
            exit 1
          }
          Write-Host "Shard ${idx}: $count iterations passed."

  selftests:
    name: Selftests (shard ${{ matrix.shard }})
    needs: plan
    if: ${{ inputs.target == 'selftests' || inputs.target == 'both' }}
    runs-on: windows-latest
    timeout-minutes: 350
    strategy:
      fail-fast: false
      matrix:
        shard: ${{ fromJSON(needs.plan.outputs.shard-list) }}
    steps:
      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2

      - name: Setup .NET
        uses: actions/setup-dotnet@c2fa09f4bde5ebb9d1777cf28262a3eb3db3ced7 # v5.2.0
        with:
          dotnet-version: 10.0.x

      - name: Restore
        run: dotnet restore tests/Reactor.SelfTests/Reactor.SelfTests.csproj -p:Platform=x64

      - name: Build (once)
        run: dotnet build tests/Reactor.SelfTests/Reactor.SelfTests.csproj --no-restore --configuration Debug -p:Platform=x64

      - name: Stress loop
        shell: pwsh
        env:
          PER_SHARD: ${{ needs.plan.outputs.per-shard }}
          REMAINDER: ${{ needs.plan.outputs.remainder }}
          SHARD_INDEX: ${{ matrix.shard }}
        run: |
          $per = [int]$env:PER_SHARD
          $rem = [int]$env:REMAINDER
          $idx = [int]$env:SHARD_INDEX
          $count = if ($idx -le $rem) { $per + 1 } else { $per }
          if ($count -lt 1) { Write-Host "Shard $idx has no work."; exit 0 }
          $failures = New-Object System.Collections.Generic.List[int]
          for ($i = 1; $i -le $count; $i++) {
            Write-Host "::group::Selftest iteration $i / $count (shard $idx)"
            dotnet test tests/Reactor.SelfTests/Reactor.SelfTests.csproj --no-restore --no-build -p:Platform=x64 --logger "console;verbosity=normal"
            $code = $LASTEXITCODE
            Write-Host "::endgroup::"
            if ($code -ne 0) {
              Write-Host "::warning::Selftest iteration $i (shard $idx) failed with exit $code"
              $failures.Add($i) | Out-Null
            }
          }
          if ($failures.Count -gt 0) {
            Write-Host "::error::Shard $idx had $($failures.Count) failed iteration(s): $($failures -join ', ')"
            exit 1
          }
          Write-Host "Shard ${idx}: $count iterations passed."

  summary:
    name: Stress summary
    needs: [plan, unit-tests, selftests]
    if: ${{ always() }}
    runs-on: ubuntu-latest
    steps:
      - name: Report
        env:
          UNIT_RESULT: ${{ needs.unit-tests.result }}
          SELFTESTS_RESULT: ${{ needs.selftests.result }}
        run: |
          echo "Unit shards:      $UNIT_RESULT"
          echo "Selftest shards:  $SELFTESTS_RESULT"
          fail=0
          # 'skipped' is OK (target filter); 'success' is OK; anything else is a fail.
          for r in "$UNIT_RESULT" "$SELFTESTS_RESULT"; do
            case "$r" in
              success|skipped|"") ;;
              *) fail=1 ;;
            esac
          done
          if [ "$fail" -eq 1 ]; then
            echo "::error::One or more stress shards failed. See per-shard logs."
            exit 1
          fi
          echo "All shards passed."