# Copyright 2024 RustFS Team
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

name: Fuzz

on:
  pull_request:
    types: [ opened, synchronize, reopened, closed ]
    # PR trigger is intentionally narrow: only changes to the fuzz harness
    # itself gate a PR. Broad crate paths (ecstore/filemeta/utils/policy/…)
    # are covered by the nightly `schedule` run below, which fuzzes against
    # whatever landed on main. Widening these paths previously queued a
    # ~45min fuzz-build on nearly every PR and is why this workflow was
    # disabled; do not re-add crate paths here.
    paths:
      - "fuzz/**"
      - "scripts/fuzz/**"
      - ".github/workflows/fuzz.yml"
  schedule:
    - cron: "0 2 * * *"
  workflow_dispatch:
    inputs:
      profile:
        description: "Which fuzz profile to run"
        required: false
        default: "both"
        type: choice
        options:
          - smoke
          - nightly
          - both

permissions:
  contents: read

concurrency:
  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
  cancel-in-progress: true

env:
  CARGO_TERM_COLOR: always
  CARGO_BUILD_TARGET: x86_64-unknown-linux-gnu
  # Fuzz targets build without the dial9 feature, so tokio_unstable is not needed.
  RUSTFLAGS: "-C target-feature=-crt-static"

jobs:
  cancel-closed-pr-runs:
    name: Cancel Closed PR Runs
    if: github.event_name == 'pull_request' && github.event.action == 'closed'
    runs-on: ubuntu-latest
    steps:
      - name: Explain cancellation run
        run: echo "PR closed; this run only cancels older runs in the same concurrency group."

  # ──────────────────────────────────────────────────────────────
  # Phase 1: Build all fuzz harness binaries once.
  # ──────────────────────────────────────────────────────────────
  fuzz-build:
    name: Build Fuzz Harness
    if: >
      (github.event_name == 'pull_request' && github.event.action != 'closed') ||
      github.event_name == 'schedule' ||
      github.event_name == 'workflow_dispatch'
    runs-on: sm-standard-4
    timeout-minutes: 45
    env:
      FORCE_JAVASCRIPT_ACTIONS_TO_NODE24: "true"
    steps:
      - name: Checkout repository
        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7

      - name: Setup Rust environment
        uses: ./.github/actions/setup
        with:
          rust-version: nightly
          cache-shared-key: fuzz-${{ hashFiles('fuzz/Cargo.lock') }}
          github-token: ${{ secrets.GITHUB_TOKEN }}
          cache-save-if: ${{ github.ref == 'refs/heads/main' || github.event_name == 'schedule' }}

      - name: Install cargo-fuzz
        uses: taiki-e/install-action@bffeee26d4db9be238a4ea78d8826604ebcb594d # v2
        with:
          tool: cargo-fuzz

      - name: Build all fuzz targets
        run: BUILD_ONLY=1 ./scripts/fuzz/run.sh

      - name: Stage prebuilt fuzz binaries
        run: |
          binary_root="fuzz/prebuilt/${CARGO_BUILD_TARGET}/release"
          mkdir -p "${binary_root}"
          # Keep this list in sync with the smoke/nightly matrices and
          # scripts/fuzz/run.sh default target set (all 5 buildable bins in
          # fuzz/Cargo.toml). The *_storage_api.rs files are `mod` submodules
          # of their parent targets, not standalone bins.
          for target in archive_extract bucket_validation local_metadata path_containment policy_ingress; do
            install -Dm755 "fuzz/target/${CARGO_BUILD_TARGET}/release/${target}" "${binary_root}/${target}"
          done

      - name: Upload prebuilt fuzz binaries
        uses: actions/upload-artifact@b7c566a772e6b6bfb58ed0dc250532a479d7789f # v6
        with:
          name: fuzz-prebuilt-binaries-${{ github.run_number }}
          path: |
            fuzz/prebuilt/${{ env.CARGO_BUILD_TARGET }}/release/archive_extract
            fuzz/prebuilt/${{ env.CARGO_BUILD_TARGET }}/release/bucket_validation
            fuzz/prebuilt/${{ env.CARGO_BUILD_TARGET }}/release/local_metadata
            fuzz/prebuilt/${{ env.CARGO_BUILD_TARGET }}/release/path_containment
            fuzz/prebuilt/${{ env.CARGO_BUILD_TARGET }}/release/policy_ingress
          if-no-files-found: error
          retention-days: 1
          compression-level: 0

  # ──────────────────────────────────────────────────────────────
  # Phase 2 (PR): Run smoke targets in parallel via matrix.
  # ──────────────────────────────────────────────────────────────
  pr-fuzz-smoke:
    name: "Smoke / ${{ matrix.target }}"
    needs: fuzz-build
    if: >
      (github.event_name == 'pull_request' && github.event.action != 'closed') ||
      (github.event_name == 'workflow_dispatch' &&
        (github.event.inputs.profile == 'smoke' || github.event.inputs.profile == 'both'))
    runs-on: sm-standard-4
    timeout-minutes: 30
    strategy:
      fail-fast: false
      # One job per target runs in parallel, so wall-clock time is per-target
      # (~60s fuzz + download/chmod overhead), not the sum across the matrix.
      matrix:
        target: [archive_extract, bucket_validation, local_metadata, path_containment, policy_ingress]
    env:
      FORCE_JAVASCRIPT_ACTIONS_TO_NODE24: "true"
    steps:
      - name: Checkout repository
        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7

      - name: Download prebuilt fuzz binaries
        uses: actions/download-artifact@37930b1c2abaa49bbe596cd826c3c89aef350131 # v7
        with:
          name: fuzz-prebuilt-binaries-${{ github.run_number }}
          path: fuzz/prebuilt/${{ env.CARGO_BUILD_TARGET }}/release

      - name: Restore executable bit
        run: chmod +x "fuzz/prebuilt/${CARGO_BUILD_TARGET}/release/${{ matrix.target }}"

      - name: Run ${{ matrix.target }}
        env:
          FUZZ_TARGET: ${{ matrix.target }}
          MAX_TOTAL_TIME: 60
          SKIP_BUILD: 1
          USE_PREBUILT_BINARY: 1
          PREBUILT_BINARY_DIR: ${{ github.workspace }}/fuzz/prebuilt/${{ env.CARGO_BUILD_TARGET }}/release
        run: ./scripts/fuzz/run.sh

      - name: Upload fuzz smoke artifacts
        if: always()
        uses: actions/upload-artifact@b7c566a772e6b6bfb58ed0dc250532a479d7789f # v6
        with:
          name: fuzz-smoke-${{ matrix.target }}-${{ github.run_number }}
          path: |
            fuzz/artifacts/**
            fuzz/corpus/${{ matrix.target }}/**
          if-no-files-found: ignore
          retention-days: 7

  # ──────────────────────────────────────────────────────────────
  # Phase 2 (Nightly): Run all targets in parallel via matrix.
  # ──────────────────────────────────────────────────────────────
  nightly-fuzz-corpus:
    name: "Nightly / ${{ matrix.target }}"
    needs: fuzz-build
    # TODO(ci-8): when the schedule-failure-issue composite action lands,
    # add a step here (or a dependent job) that opens/updates a GitHub issue
    # on nightly failure. ci-8 is the single alerting mechanism for all
    # scheduled workflows; do not self-roll alerting in this workflow.
    if: >
      github.event_name == 'schedule' ||
      (github.event_name == 'workflow_dispatch' &&
        (github.event.inputs.profile == 'nightly' || github.event.inputs.profile == 'both'))
    runs-on: sm-standard-4
    timeout-minutes: 60
    strategy:
      fail-fast: false
      matrix:
        target: [archive_extract, bucket_validation, local_metadata, path_containment, policy_ingress]
    env:
      FORCE_JAVASCRIPT_ACTIONS_TO_NODE24: "true"
    steps:
      - name: Checkout repository
        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7

      - name: Download prebuilt fuzz binaries
        uses: actions/download-artifact@37930b1c2abaa49bbe596cd826c3c89aef350131 # v7
        with:
          name: fuzz-prebuilt-binaries-${{ github.run_number }}
          path: fuzz/prebuilt/${{ env.CARGO_BUILD_TARGET }}/release

      - name: Restore executable bit
        run: chmod +x "fuzz/prebuilt/${CARGO_BUILD_TARGET}/release/${{ matrix.target }}"

      - name: Run ${{ matrix.target }}
        env:
          FUZZ_TARGET: ${{ matrix.target }}
          MAX_TOTAL_TIME: 300
          SKIP_BUILD: 1
          USE_PREBUILT_BINARY: 1
          PREBUILT_BINARY_DIR: ${{ github.workspace }}/fuzz/prebuilt/${{ env.CARGO_BUILD_TARGET }}/release
        run: ./scripts/fuzz/run.sh

      - name: Upload nightly fuzz artifacts
        if: always()
        uses: actions/upload-artifact@b7c566a772e6b6bfb58ed0dc250532a479d7789f # v6
        with:
          name: fuzz-nightly-${{ matrix.target }}-${{ github.run_number }}
          path: |
            fuzz/artifacts/**
            fuzz/corpus/${{ matrix.target }}/**
          if-no-files-found: ignore
          retention-days: 30

  # ──────────────────────────────────────────────────────────────
  # Nightly alerting: open/update a tracking issue on failure.
  # ──────────────────────────────────────────────────────────────
  alert-on-failure:
    name: Alert on scheduled failure
    needs: [fuzz-build, nightly-fuzz-corpus]
    # `always()` is required: without it this job is skipped when a needed
    # job fails. Alerts only for scheduled (nightly) runs (backlog#1149
    # ci-8); PR and manual dispatch failures are already watched by a human.
    if: always() && github.event_name == 'schedule' && contains(needs.*.result, 'failure')
    runs-on: ubuntu-latest
    timeout-minutes: 10
    permissions:
      contents: read
      issues: write
    steps:
      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7
      - name: Open or update failure-tracking issue
        uses: ./.github/actions/schedule-failure-issue
        with:
          github-token: ${{ secrets.GITHUB_TOKEN }}