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packages-worker-add-entrypoint

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Scaffold a new sub-worker inside packages_worker (npm, deps.dev, osv, scorecard, etc.) following the single-service multi-entry-point structure. Use when: "add a new packages worker", "scaffold a sub-worker in packages_worker", "new worker for packages-db", "add npm worker", "add OSV worker", "add deps.dev worker".

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packages-worker — Add a New Sub-worker

You are adding a new data-ingestion worker to services/apps/packages_worker/. The structure follows the same pattern as backend/ (where api.ts and job-generator.ts share one Dockerfile): one npm package, one Docker image, each worker in its own src/{worker}/ directory with its own entry point.

services/apps/packages_worker/
  src/
    bin/
      github-repos-enricher.ts  ← existing worker
      <name>.ts                 ← entry point you will create
    github/                     ← existing worker logic
    <worker>/                   ← directory you will create
      index.ts                  ← main logic for this worker
      types.ts
    config.ts                   ← shared — add your config getter here
    db.ts                       ← shared — do not modify

Step 1 — Gather requirements

Ask the engineer for:

  1. Worker name (kebab-case) — e.g. npm-sync, osv-sync, scorecard-runner. Used as the entry point filename (src/bin/<name>.ts) and docker-compose service name.
  2. Worker directory name (short, lowercase) — e.g. npm, osv, scorecard. Becomes src/<worker>/.
  3. What it does — what data it fetches/writes, what table(s) in packages-db it reads from and writes to.
  4. External API or data source (if any) — URL, auth method, rate-limit characteristics.
  5. Required env vars beyond the shared DB vars — e.g. NPM_API_URL, OSV_API_KEY.

Do not proceed until you have answers to 1–3.

Step 2 — Read existing files first

cat services/apps/packages_worker/src/bin/github-repos-enricher.ts
cat services/apps/packages_worker/src/config.ts
cat services/apps/packages_worker/package.json
cat scripts/services/github-repos-enricher.yaml

These are the canonical references. Do not deviate from the patterns you see there.

Step 3 — Scaffold the files

3a. Worker directory — services/apps/packages_worker/src/<worker>/

Create the directory with at minimum:

types.ts — types specific to this worker (input/output shapes, error kinds if calling an external API).

index.ts — the main logic function(s) this worker runs. What goes here depends entirely on what the worker does — do not force a loop shape if it does not fit. Discuss with the engineer what the execution model should be (continuous loop, one-shot batch, event-driven, etc.) and implement accordingly.

Add any additional files the worker needs (e.g. an API client, a DB query helper). All DB access uses inline pg-promise SQL via qx.select / qx.result / qx.none — do not add files to services/libs/data-access-layer.

3b. Entry point — services/apps/packages_worker/src/bin/<name>.ts

Follow the structure of github-repos-enricher.ts:

  • Import getServiceLogger from @crowd/logging
  • Import your worker's config getter from ../config and getPackagesDb from ../db
  • Import your worker's main function from ../<worker>/index
  • Set liveFilePath / readyFilePath to ../tmp/<name>-live.tmp / ../tmp/<name>-ready.tmp
  • Handle SIGINT / SIGTERM with a shuttingDown flag
  • In main(): call config getter → validate any required tokens/keys → await getPackagesDb() → await qx.selectOne('SELECT 1') → fs.mkdirSync for the tmp dir → setInterval writing probe files every 5000ms → call your worker's main function → clearInterval → process.exit(0)
  • Fatal handler: main().catch(err => { log.error({ err }, '<name> fatal error'); process.exit(1) })

3c. Config additions — services/apps/packages_worker/src/config.ts

Read the file first, then add a get<Worker>Config() function:

  • Use requireEnv(name) for string vars, requireEnvInt(name) for integers
  • No defaults, no ?? undefined — the process must refuse to start on missing config

3d. Docker-compose service — scripts/services/<name>.yaml

Copy scripts/services/github-repos-enricher.yaml and adapt:

  • Service names: <name> (prod) and <name>-dev (dev)
  • command (prod): pnpm run start:<name>
  • command (dev): pnpm run dev:<name>
  • env_file: keep the same four files (backend/.env.dist.local, backend/.env.dist.composed, backend/.env.override.local, backend/.env.override.composed)
  • environment: set any tuning var defaults inline (avoids requiring them in .env.override.local for local dev)
  • volumes (dev only): bind-mount ./services/apps/packages_worker/src plus every services/libs/*/src directory (copy the full list from the enricher yaml for hot reload)

3e. package.json scripts — services/apps/packages_worker/package.json

Read the file first, then add:

"start:<name>": "tsx src/bin/<name>.ts",
"dev:<name>": "tsx watch src/bin/<name>.ts"

3f. Env var files — backend/.env.dist.local and backend/.env.dist.composed

Append new required vars with empty-string defaults (or sensible local values for non-secrets):

NEW_WORKER_API_KEY=

Step 4 — TypeScript check

cd services/apps/packages_worker && pnpm tsc --noEmit

Fix any errors before proceeding.

Checklist before committing

  • src/<worker>/ directory created with types.ts and index.ts
  • src/bin/<name>.ts — probe files, SIGINT/SIGTERM handler, fail-fast config check, SELECT 1 on startup
  • config.ts — new get<Worker>Config() using requireEnv/requireEnvInt, no defaults
  • scripts/services/<name>.yaml — prod + dev services with bind mounts
  • package.json — start:<name> and dev:<name> scripts added
  • backend/.env.dist.local and .env.dist.composed — new vars documented
  • No new files in services/libs/data-access-layer (packages-db uses inline SQL)
  • pnpm tsc --noEmit passes

Use /preflight before opening a PR and /commit to sign off.