name: bench

# THE GITHUB side of the CI race. Runs on github.com only: rickub reads
# .rickub/workflows/ as its sole workflow source when that directory exists
# and ignores .github/workflows/ entirely (rickub web/ci_dispatch.go
# walkWorkflows), so the two files never double-fire. Keep the STEP ORDER
# identical to .rickub/workflows/bench.yml — that is the point of the
# benchmark.
#
# Deliberately NO `concurrency:` block: queue depth is part of what we
# measure, and cancel-in-progress would destroy rounds.

on:
  push:
    branches: [main]
  workflow_dispatch:

permissions:
  contents: read

defaults:
  run:
    shell: bash

env:
  BENCH_PLATFORM: github

jobs:
  bench:
    runs-on: ubuntu-latest
    timeout-minutes: 30
    steps:
      # Pin comment policy mirrors rickub's own ci.yml: SHA-pinned actions.
      - uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4

      - name: mark job-start
        run: |
          rid="${GITHUB_RUN_ID:-0}-${GITHUB_RUN_ATTEMPT:-1}-$(git rev-parse --short HEAD)"
          echo "BENCH_RUN_ID=$rid" >> "$GITHUB_ENV"
          source "${GITHUB_WORKSPACE:-$PWD}/scripts/emit_timing.sh"
          BENCH_RUN_ID="$rid" bench_mark job-start

      # COLD build: hosted runners start empty, so this run of cargo fetches
      # every crate and compiles the full tree. `rm -rf target` is belt and
      # braces (it should never exist here). No actions/cache on purpose.
      - name: rust cold build
        run: |
          set -euo pipefail
          source "${GITHUB_WORKSPACE:-$PWD}/scripts/emit_timing.sh"
          bench_step rust-cold-build bash -ec \
            'rm -rf workloads/rust-build/target && cargo build --manifest-path workloads/rust-build/Cargo.toml'

      # WARM build: same job, target/ populated — measures the incremental
      # no-op rebuild path (link + freshness checks only).
      - name: rust warm build
        run: |
          set -euo pipefail
          source "${GITHUB_WORKSPACE:-$PWD}/scripts/emit_timing.sh"
          bench_step rust-warm-build cargo build --manifest-path workloads/rust-build/Cargo.toml

      - name: rust test
        run: |
          set -euo pipefail
          source "${GITHUB_WORKSPACE:-$PWD}/scripts/emit_timing.sh"
          bench_step rust-test cargo test --manifest-path workloads/rust-build/Cargo.toml

      # docker-build: skipped (recorded, not failed) when docker is absent.
      - name: docker build
        run: |
          set -euo pipefail
          source "${GITHUB_WORKSPACE:-$PWD}/scripts/emit_timing.sh"
          if command -v docker >/dev/null 2>&1; then
            bench_step docker-build bash -ec \
              'docker build -t ci-bench:docker workloads/docker-build && docker run --rm ci-bench:docker'
          else
            bench_skip docker-build "docker not available on runner"
          fi

      - name: probe runner
        run: bash workloads/probe/probe.sh

      - name: show results
        run: cat "${GITHUB_WORKSPACE:-$PWD}/results.jsonl"

      - uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4
        with:
          name: bench-results
          path: results.jsonl