name: Seed Rust Ext Cache

# A cache entry only reaches every PR when it was written from the default branch's
# ref, and pr-test.yml has no push trigger - so a merge that moves the key leaves
# every PR compiling for itself until the next scheduled run, up to 12h later.

on:
  push:
    branches: [main]
    paths:
      - 'rust/**'
      - 'proto/**'
      - 'python/setup.py'
      - 'python/pyproject.toml'
      - 'python/sglang/srt/rust_extensions/torch_build.py'
      # The key's prefix lives in this file, so a bump there also moves the key.
      - '.github/workflows/_pr-test-rust-ext-build.yml'
      - 'scripts/ci/utils/stage_rust_ext_modules.sh'
      # Not hashed into the key, but they carry the prefix each side uses: the one
      # seeded per arch here, and the one consumers restore with there.
      - '.github/workflows/seed-rust-ext-cache.yml'
      - '.github/actions/download-rust-ext/action.yml'
  workflow_dispatch:

# Only the newest merge needs to seed; earlier ones are already stale.
concurrency:
  group: seed-rust-ext-cache
  cancel-in-progress: true

# Declaring permissions at all drops everything not listed. issues: read for
# check-maintenance; actions: read for the restore job's gh cache list.
permissions:
  actions: read
  contents: read
  issues: read

jobs:
  seed:
    uses: ./.github/workflows/_pr-test-rust-ext-build.yml
    with:
      runs_on: ubuntu-22.04
    secrets: inherit

  # One entry per arch, since the arch is part of the key.
  seed-aarch64:
    uses: ./.github/workflows/_pr-test-rust-ext-build.yml
    with:
      runs_on: ubuntu-22.04-arm
      collect_runs_on: ubuntu-22.04-arm
      artifact_name: rust-ext-aarch64
      cache_key_prefix: rust-ext-aarch64-cp310-cp312
    secrets: inherit