93 lines
3.1 KiB
Python
93 lines
3.1 KiB
Python
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"""The NestQuest FastAPI application.
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This module builds the ASGI app for the NestQuest API service (Feature
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16). The skeleton here wires the bundled ``core`` (Feature 15) and
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exposes the two endpoints every later task depends on:
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- ``GET /health`` — returns ``200`` with a JSON status body carrying
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``status: "ok"`` and the resolved database path, proving the app
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imported core, opened the database, and applied migrations.
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- ``GET /docs`` — FastAPI's auto-served OpenAPI document (Swagger UI);
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``/openapi.json`` is the raw schema. No extra wiring is needed;
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FastAPI serves both by default.
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The database is opened and migrated in a FastAPI lifespan context so a
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startup failure (e.g. an unwritable path) surfaces as a startup error
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rather than the first request. The connection is closed on shutdown.
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"""
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from __future__ import annotations
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import logging
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from contextlib import asynccontextmanager
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from collections.abc import AsyncIterator
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from fastapi import FastAPI
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from api.config import ApiConfig
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from api.database import DatabaseState, make_database
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LOGGER = logging.getLogger(__name__)
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def _build_lifespan(db_path: str):
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"""Return a lifespan that opens+migrates then closes one database.
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Captured as a closure so the app factory can hand the configured
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path in without threading it through FastAPI's lifespan signature.
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"""
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@asynccontextmanager
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async def lifespan(app: FastAPI) -> AsyncIterator[None]:
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state = make_database(db_path)
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app.state.db = state
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try:
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await state.open_and_migrate()
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yield
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finally:
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await state.close()
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return lifespan
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def create_app(config: ApiConfig | None = None) -> FastAPI:
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"""Build the NestQuest API FastAPI app.
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``config`` defaults to one built from the process environment, so
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``uvicorn api.app:app`` picks up ``NESTQUEST_DB_PATH``. Tests pass an
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explicit config (or set the env var) so each test gets a hermetic
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temp SQLite file.
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"""
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cfg = config if config is not None else ApiConfig.from_env()
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app = FastAPI(
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title="NestQuest API",
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description=(
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"Standalone HTTP service that owns the NestQuest database and "
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"exposes it to the Home Assistant integration (panel plane) and "
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"the admin PWA (admin plane)."
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),
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version="0.1.0",
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lifespan=_build_lifespan(cfg.db_path),
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)
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@app.get("/health", summary="Service health")
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async def health() -> dict[str, str]:
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"""Return service health and the resolved database path.
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The body carries ``status: "ok"`` and the ``db_path`` the app
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opened against — so a probe can confirm the app wired core and
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reached the configured SQLite file. Returns 200 once the
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lifespan has opened and migrated the database.
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"""
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state: DatabaseState = app.state.db
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return {"status": "ok", "db_path": state.db_path}
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return app
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#: The module-level app instance, for ``uvicorn api.app:app``.
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app: FastAPI = create_app()
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__all__ = ["app", "create_app"]
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