name: CI

on:
  push:
  pull_request:
    branches: [ main ]

env:
  CARGO_TERM_COLOR: always

jobs:
  fetch:
    name: Fetch Cargo dependencies
    runs-on: ubuntu-latest

    permissions:
      contents: read

    steps:
      - name: Checkout the code
        uses: actions/checkout@v3

      - name: Install toolchain
        uses: actions-rs/toolchain@v1
        with:
          toolchain: "1.57.0" # MSRV
          target: x86_64-unknown-linux-musl
          profile: minimal
          override: true

      - name: Setup Cargo cache
        uses: actions/cache@v3.0.2
        with:
          path: |
            ~/.cargo/registry/index
            ~/.cargo/registry/cache
            ~/.cargo/git/db
          key: ${{ runner.os }}-cargo-deps-msrv-${{ hashFiles('**/Cargo.lock') }}

      - name: Fetch dependencies
        id: fetch
        uses: actions-rs/cargo@v1
        continue-on-error: true
        with:
          command: fetch
          args: --locked

      - name: Fetch dependencies (retry)
        id: fetch-2
        uses: actions-rs/cargo@v1
        if: steps.fetch.outcome == 'failure'
        continue-on-error: true
        with:
          command: fetch
          args: --locked

      - name: Fetch dependencies (second retry)
        uses: actions-rs/cargo@v1
        if: steps.fetch.outcome == 'failure' && steps.fetch-2.outcome == 'failure'
        with:
          command: fetch
          args: --locked


  rustfmt:
    name: Check style
    needs: [fetch]
    runs-on: ubuntu-latest

    permissions:
      contents: read

    steps:
      - name: Checkout the code
        uses: actions/checkout@v3

      - name: Install toolchain
        id: toolchain
        uses: actions-rs/toolchain@v1
        with:
          toolchain: nightly
          target: x86_64-unknown-linux-musl
          components: rustfmt
          profile: minimal
          override: true

      - name: Setup Cargo cache
        uses: actions/cache@v3.0.2
        with:
          path: |
            ~/.cargo/registry/index
            ~/.cargo/registry/cache
            ~/.cargo/git/db
          key: ${{ runner.os }}-cargo-deps-msrv-${{ hashFiles('**/Cargo.lock') }}

      - name: Setup build cache
        uses: actions/cache@v3.0.2
        with:
          path: |
            target
          key: cargo-fmt-${{ hashFiles('**/Cargo.lock') }}-${{ steps.toolchain.outputs.rustc_hash }}

      - name: Check style
        uses: actions-rs/cargo@v1
        with:
          command: fmt
          args: --all -- --check


  clippy:
    name: Run Clippy
    needs: [fetch]
    runs-on: ubuntu-latest

    permissions:
      contents: read

    steps:
      - name: Checkout the code
        uses: actions/checkout@v3

      - name: Install toolchain
        id: toolchain
        uses: actions-rs/toolchain@v1
        with:
          toolchain: stable
          target: x86_64-unknown-linux-musl
          components: clippy
          profile: minimal
          override: true

      - name: Setup Cargo cache
        uses: actions/cache@v3.0.2
        with:
          path: |
            ~/.cargo/registry/index
            ~/.cargo/registry/cache
            ~/.cargo/git/db
          key: ${{ runner.os }}-cargo-deps-msrv-${{ hashFiles('**/Cargo.lock') }}

      - name: Setup build cache
        uses: actions/cache@v3.0.2
        with:
          path: |
            target
          key: cargo-clippy-${{ hashFiles('**/Cargo.lock') }}-${{ steps.toolchain.outputs.rustc_hash }}

      - name: Run Clippy
        uses: actions-rs/cargo@v1
        with:
          command: clippy
          args: --workspace -- -D warnings


  test:
    name: Run test suite with Rust ${{ matrix.toolchain }}
    needs: [rustfmt, clippy, fetch]
    runs-on: ubuntu-latest

    permissions:
      contents: read

    continue-on-error: "${{ matrix.toolchain == 'beta' || matrix.toolchain == 'nightly' }}"

    strategy:
      fail-fast: false # Continue other jobs if one fails to help filling the cache
      matrix:
        toolchain:
          - "1.57.0" # MSRV
          - stable
          - beta
          - nightly

    steps:
      - name: Checkout the code
        uses: actions/checkout@v3

      - name: Install toolchain
        id: toolchain
        uses: actions-rs/toolchain@v1
        with:
          toolchain: ${{ matrix.toolchain }}
          target: x86_64-unknown-linux-musl
          profile: minimal
          override: true

      - name: Setup Cargo cache
        uses: actions/cache@v3.0.2
        with:
          path: |
            ~/.cargo/registry/index
            ~/.cargo/registry/cache
            ~/.cargo/git/db
          key: ${{ runner.os }}-cargo-deps-msrv-${{ hashFiles('**/Cargo.lock') }}

      - name: Setup build cache
        uses: actions/cache@v3.0.2
        with:
          path: |
            target
          key: ${{ runner.os }}-cargo-build-${{ steps.toolchain.outputs.rustc_hash }}-${{ hashFiles('**/Cargo.lock') }}

      - name: Test
        uses: actions-rs/cargo@v1
        with:
          command: test
          args: --offline --workspace


  coverage:
    name: Code coverage
    needs: [rustfmt, clippy, fetch]
    runs-on: ubuntu-latest

    permissions:
      contents: read

    steps:
      - name: Checkout the code
        uses: actions/checkout@v3

      - name: Install toolchain
        id: toolchain
        uses: actions-rs/toolchain@v1
        with:
          toolchain: stable
          target: x86_64-unknown-linux-musl
          override: true
          components: llvm-tools-preview

      - name: Setup Cargo cache
        uses: actions/cache@v3.0.2
        with:
          path: |
            ~/.cargo/registry/index
            ~/.cargo/registry/cache
            ~/.cargo/git/db
          key: ${{ runner.os }}-cargo-deps-msrv-${{ hashFiles('**/Cargo.lock') }}

      - name: Setup build cache
        uses: actions/cache@v3.0.2
        with:
          path: |
            target
          key: ${{ runner.os }}-cargo-coverage-${{ steps.toolchain.outputs.rustc_hash }}-${{ hashFiles('**/Cargo.lock') }}

      - name: Download grcov
        run: |
          mkdir -p "${HOME}/.local/bin"
          curl -sL https://github.com/mozilla/grcov/releases/download/v0.8.7/grcov-x86_64-unknown-linux-gnu.tar.bz2 | tar jxf - -C "${HOME}/.local/bin"
          echo "$HOME/.local/bin" >> $GITHUB_PATH


      - name: Run test suite with profiling enabled
        uses: actions-rs/cargo@v1
        with:
          command: test
          args: --all-features --no-fail-fast --workspace --tests
        env:
          CARGO_INCREMENTAL: '0'
          RUSTFLAGS: '-Cinstrument-coverage'
          LLVM_PROFILE_FILE: "cargo-test-%p-%m.profraw"

      - name: Build grcov report
        run: |
          mkdir -p target/coverage
          grcov . --binary-path ./target/debug/deps/ -s . -t lcov --branch --ignore-not-existing --ignore '../*' --ignore "/*" -o target/coverage/tests.lcov

      - name: Upload to codecov.io
        uses: codecov/codecov-action@v3
        with:
          files: target/coverage/*.lcov


  build-image:
    name: Build and push Docker image
    needs: [rustfmt, clippy]
    runs-on: ubuntu-latest
    env:
      IMAGE: ghcr.io/matrix-org/matrix-authentication-service

    permissions:
      contents: read
      packages: write
      id-token: write

    steps:
      - name: Checkout the code
        uses: actions/checkout@v3

      - name: Docker meta
        id: meta
        uses: docker/metadata-action@v4
        with:
          images: "${{ env.IMAGE }}"
          bake-target: docker-metadata-action
          tags: |
            type=ref,event=branch
            type=semver,pattern={{version}}
            type=semver,pattern={{major}}.{{minor}}
            type=semver,pattern={{major}}
            type=sha

      - name: Docker meta (debug variant)
        id: meta-debug
        uses: docker/metadata-action@v4
        with:
          images: "${{ env.IMAGE }}"
          bake-target: docker-metadata-action-debug
          tags: |
            type=ref,event=branch,suffix=-debug
            type=semver,pattern={{version}},suffix=-debug
            type=semver,pattern={{major}}.{{minor}},suffix=-debug
            type=semver,pattern={{major}},suffix=-debug
            type=sha,suffix=-debug

      - name: Merge buildx bake files
        run: |
            jq -s '.[0] * .[1]' ${{ steps.meta.outputs.bake-file }} ${{ steps.meta-debug.outputs.bake-file }} > docker-bake.override.json

      - name: Setup Cosign
        uses: sigstore/cosign-installer@v2.3.0

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v2
        with:
          config-inline: |
            [registry."docker.io"]
              mirrors = ["mirror.gcr.io"]

      - name: Login to GitHub Container Registry
        if: github.event_name != 'pull_request'
        uses: docker/login-action@v2
        with:
          registry: ghcr.io
          username: ${{ github.repository_owner }}
          password: ${{ secrets.GITHUB_TOKEN }}

      # For pull-requests, only read from the cache, do not try to push to the
      # cache or the image itself
      - name: Build
        uses: docker/bake-action@v2
        if: github.event_name == 'pull_request'
        with:
          set: |
            base.cache-from=type=registry,ref=${{ env.IMAGE }}:buildcache

      - name: Build and push
        uses: docker/bake-action@v2
        if: github.event_name != 'pull_request'
        with:
          set: |
            base.output=type=image,push=true
            base.cache-from=type=registry,ref=${{ env.IMAGE }}:buildcache
            base.cache-to=type=registry,ref=${{ env.IMAGE }}:buildcache,mode=max

      - name: Sign the images with GitHub Actions provided token
        # Only sign on tags and on commits on main branch
        if: |
          github.event_name != 'pull_request'
          && (startsWith(github.ref, 'refs/tags/v') || github.ref == 'refs/heads/main')

        run: cosign sign ${TAGS}
        env:
          TAGS: "${{ steps.meta.outputs.tags }} ${{ steps.meta-debug.outputs.tags }}"
          COSIGN_EXPERIMENTAL: 1