# foreman

A small, always-on daemon that fronts **one** Ollama target. It turns a single
Ollama instance into a queued, observable job endpoint: it polls the target's
installed models, serializes work through the target (managing model swaps),
assigns every job an ID, and reports progress + artifacts via webhooks. On the
wire it speaks **native Ollama**, so it doubles as a drop-in `go-llm` target.

foreman is the deliberately pared-down successor to `peon-overseer`. One daemon,
one target, one queue. The complexity that sank the predecessor — distributed
dispatch, claim leases, weighted fair queueing, capacity budgets, eligibility
gates — existed to coordinate *multiple* workers and is **out of scope**.
Resisting that creep is a first-class design goal. See `docs/adr/` for the
decisions; this file summarizes them.

## Topology (ADR-0001, ADR-0002)

```
orgrimmar:  foreman  (Go binary + SQLite queue + HTTP API + worker loop)
              |  HTTP over the trusted VLAN / Tailscale
              v
M1 Pro Mac:  Ollama only  (models on disk, no foreman logic)
```

- One foreman process per Ollama target, configured by a single base URL
  (default: the Mac's Tailscale address). A second worker = a second foreman.
- foreman runs on the homelab, containerized, deployed via Komodo. The Mac stays
  a dumb appliance.
- The target is a laptop and may sleep. Unreachability is transient/recoverable,
  never fatal (poller degraded mode + job retry below).

## API surfaces (ADR-0003, ADR-0004)

1. **Primary — transparent native Ollama passthrough:** `/api/chat`, `/api/tags`,
   `/api/ps`. foreman looks exactly like an Ollama server. Synchronous: calls are
   queued internally but the HTTP response blocks until completion. SSE streaming
   supported (ADR-0012). This is the `go-llm` target path.
2. **Async jobs — `POST /jobs`, `GET /jobs/{id}`:** body is a native-chat payload
   plus optional `state_webhook_url`. Returns `202` + `{ "job_id": "<ulid>" }`
   immediately. For fire-and-forget orchestration callers.
3. **Optional OpenAI-compat `/v1/chat/completions` + `/v1/models`:** deferred;
   added only if a non-go-llm caller needs it.

Job lifecycle: `queued → loading → working → done` (+ terminal `failed`). A
connection failure to the target re-queues the job with backoff (bounded retries
guard poison jobs). IDs are ULIDs (sortable, timestamped).

## Webhooks & artifacts (ADR-0005, ADR-0006)

- On each state transition, POST a JSON event to `state_webhook_url`
  (`job_id`, `state`, `previous_state`, `timestamp`, `model`, `attempt`, and on
  completion `result` / `artifacts` / `error`).
- At-least-once delivery; callers must be idempotent on `job_id`+`state`; missed
  events reconcile via `GET /jobs/{id}`. Retry with bounded backoff. Optional
  `X-Foreman-Signature` HMAC when a webhook secret is configured.
- Artifacts are named typed blobs; the completion is always artifact `completion`.
  Inline under ~256KB, otherwise fetched via `GET /jobs/{id}/artifacts/{name}`.

## Model inventory (ADR-0007)

- A poller hits the target's `/api/tags` (default ~30s) to keep an in-sync model
  list; backs foreman's `/api/tags` passthrough and job validation.
- `/api/ps` tells foreman what's resident, feeding the scheduler.
- Jobs naming an uninstalled model are rejected at submit time (one re-check on
  miss). Target unreachable → retain last-known list, mark degraded on a health
  endpoint; do not reject wholesale on a single failed poll.

## Execution (ADR-0009)

- **Concurrency against the target is 1.** A single worker loop pulls a job,
  ensures the right model is resident, executes, records the result.
- **Drain-by-model:** finish every queued job for the currently-resident model
  before paying a swap (`ORDER BY (model != current), created_at`). A heuristic,
  not a scheduler. No priorities, fairness, or budgets.
- Pin residency with Ollama `keep_alive`; target runs `OLLAMA_MAX_LOADED_MODELS=1`
  and `OLLAMA_CONTEXT_LENGTH=8192`+.

## Persistence (ADR-0008)

- SQLite, WAL mode, pure-Go `modernc.org/sqlite` (no CGO → trivial Komodo builds).
- `jobs` + `artifacts` tables; single writer (the worker) + HTTP readers. TTL
  sweep for pruning. No external broker.

## Models served

foreman serves **any installed model** named in a request; it does not own a
role→model mapping (the caller picks the model, e.g. go-llm `.Model(...)`).
Recommended roster to pull on the Mac (32GB, ~26-28GB usable, single-resident
swap):

- **parse / data** — `qwen3:14b` (~9GB, structured/JSON output).
- **agent + code** — `qwen3.6:35b` (MoE, ~3B active, ~20GB, fast tool-calling).
- Split a dedicated dense coder (`qwen3.6:27b`) off later only if `35b`'s code
  quality disappoints; it's bandwidth-bound and slow on this Mac.
- Verify exact tags against the Ollama library before pulling; the registry moves.

## go-llm integration (ADR-0011)

Verified: `llm.OllamaCloud(key, WithBaseURL(...))` already targets a private
authenticated native-Ollama endpoint — which foreman is. Integration is a thin
constructor, no new provider:

- **Level 0 (now):** `llm.Foreman(baseURL, token).Model("qwen3.6:35b")` — delegates
  to the ollama provider; transparent, synchronous, full tool/think/stream.
- **Level 1 (later):** a `foreman` client package — synchronous facade over the
  async `/jobs` surface (manages a webhook receiver, blocks to done).
- **Level 2 (if needed):** a dedicated `provider.Provider` surfacing job IDs/state.

## Security (ADR-0010)

- Network is the boundary: target `:11434` firewalled to foreman, and/or both on
  Tailscale. foreman is **not** on a public Traefik entrypoint.
- Optional static bearer: validate `Authorization: Bearer <token>`, which reuses
  the header `go-llm` already sends via the Foreman/OllamaCloud path.
- No Authentik/SSO, no per-caller identities for v1. No financial/identity data
  ever transits foreman.

## Stack & conventions

- Go, stdlib `net/http`, minimal deps. SQLite via `modernc.org/sqlite`.
- No UI. HTTP API + small CLI only.
- Match go-llm house style: standard Go tabs; `camelCase`/`PascalCase`; check
  errors immediately and wrap with `fmt.Errorf("%w: ...", err)`; imports stdlib →
  third-party → internal. The worker loop never panics; it logs, marks the job,
  continues.
- ADRs in `docs/adr/` (one decision each, append/supersede). Living `progress.md`
  at repo root. Repo: `gitea.stevedudenhoeffer.com`.

## Out of scope (anti-creep guardrails — ADR-0001)

Distributed dispatch, multiple workers, claim leases, weighted fair queueing,
capacity budgets, eligibility gates, an auth framework / SSO, a GUI, and managing
more than one target per daemon. Keep the ollama client behind a small interface
so a future second backend is additive — but do not build for it now.

## Milestones

- **M0** — native `/api/chat` passthrough + SQLite queue + single-worker loop, one
  model end to end, synchronous.
- **M1** — model poller + `/api/tags`/`/api/ps`, drain-by-model, async `/jobs` +
  `state_webhook_url` + artifacts + retry-on-unreachable, the CLI, and the
  `llm.Foreman()` constructor in go-llm.
- **M2 (later)** — optional OpenAI-compat `/v1`, Level-1 client / dedicated
  provider, metrics.