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spark-control/docs/guides/fastapi-image.md
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---
paths:
- "image/**"
---
# FastAPI image (`image/`)
Standalone FastAPI app (Python ≥3.11; ships on `python:3.12-slim`; UI on port 9999; vanilla HTML/CSS/JS, no framework). Python has no configured linter/formatter — match the style of the file you're editing.
## Local dev (no StartOS)
```bash
cd image
python3 -m venv .venv && source .venv/bin/activate # one-time
pip install -e .
export SPARK1_HOST=<ip> SPARK1_USER=<user> SPARK2_HOST=<ip> SPARK2_USER=<user> SSH_KEY_PATH=<private-key>
# Required outside the container — these default to paths under /data, which only exists in the image
# (missing REDACTION_MAP_DB crashes startup; missing CONNECTIVITY_LOG 500s /api/status):
export REDACTION_MAP_DB=/tmp/redaction_maps.db CONNECTIVITY_LOG=/tmp/connectivity.json
uvicorn app.server:app --host 0.0.0.0 --port 9999 --reload
```
Other env vars: `BIND_PORT`, `MODELS_YAML`, `SSH_DIR`, `SSH_KNOWN_HOSTS`, `MODELS_OVERRIDES`, `SERVICES_OVERRIDES`.
## Tests
No pytest harness — each suite is a standalone script run with the `image/.venv` interpreter (system python3 has no deps). See the redaction and audio rules for the suites themselves.
## Conventions
- Pydantic request models go at **module scope**, never inside a `build_router()` body (FastAPI silently 422s otherwise).
- New external-facing endpoints get documented in `docs/` (`AUDIO_API.md`, `EMBEDDINGS.md`, `REDACTION_GATEWAY.md`) and noted in release notes.
## Layout
- `image/app/server.py` — FastAPI entry; routers live in sibling modules (`audio_proxy.py`, `llm_proxy.py`, `embeddings_proxy.py`, `redaction_gateway.py`, `swap.py`, `health.py`, `deep_health.py`, `connectivity.py`, …).
- `image/app/static/` — the dashboard UI.
- `image/models.yaml` — vLLM model catalog bundled into the image.
- `image/spark_embed/` — Dockerfile + app for the embeddings container; built ON a Spark (ARM64, NGC PyTorch base — see the audio/cluster rule for NGC torch-pinning caveats).