# Warms the Go module cache, build cache, and CI tool binaries that server CI
# jobs restore read-only (via restore-go-cache). Runs daily on master and on
# demand, keyed on the Go version and all go.mod/go.sum files.
# server/bin is only a warm start: every consumer re-runs its install-<tool>
# prerequisite, so a binary the key doesn't cover still gets rebuilt before use.
name: Server CI Cache Warm

on:
  schedule:
    - cron: "0 2 * * *" # Daily 2am UTC — before the nightly server CI runs
  workflow_dispatch:

# Serialize scheduled and manual runs so they don't race to save the same key.
concurrency:
  group: server-ci-cache-warm
  cancel-in-progress: false

permissions:
  contents: read
  actions: write # required to save the Actions cache

jobs:
  warm:
    name: Warm Go Module and Build Cache
    runs-on: ubuntu-22.04
    # Don't let a hung run hold the concurrency group for the default 6 hours.
    timeout-minutes: 60
    steps:
      - name: Checkout mattermost project
        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
        with:
          persist-credentials: false

      - name: Check if Go cache already warm
        id: go-cache-check
        uses: actions/cache/restore@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5.0.5
        with:
          path: |
            ${{ runner.temp }}/go-cache/mod
            ${{ runner.temp }}/go-cache/build
            server/bin
          key: gomod-v1-${{ hashFiles('server/.go-version') }}-${{ hashFiles('**/go.mod', '**/go.sum') }}
          lookup-only: true

      - name: Warm cache inside build container
        if: steps.go-cache-check.outputs.cache-hit != 'true'
        # Populates GOMODCACHE/GOCACHE (mounted from RUNNER_TEMP) and installs
        # tools to server/bin — the paths saved below.
        uses: ./.github/actions/run-in-buildenv
        with:
          run: make go-cache

      - name: Fix file ownership (Docker writes files as root)
        if: steps.go-cache-check.outputs.cache-hit != 'true'
        run: sudo chown -R "$USER:$USER" "${RUNNER_TEMP}/go-cache" server/bin

      - name: Save Go cache
        if: steps.go-cache-check.outputs.cache-hit != 'true'
        uses: actions/cache/save@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5.0.5
        with:
          path: |
            ${{ runner.temp }}/go-cache/mod
            ${{ runner.temp }}/go-cache/build
            server/bin
          key: gomod-v1-${{ hashFiles('server/.go-version') }}-${{ hashFiles('**/go.mod', '**/go.sum') }}