Sergey Antropoff
119 lines
4.9 KiB
Python
119 lines
4.9 KiB
Python
"""FastAPI application factory and ASGI entry point."""
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from __future__ import annotations
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from typing import cast
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from fastapi import FastAPI, Response
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from app.api.errors import ApiError, api_error_handler, unhandled_exception_handler
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from app.api.middleware import RequestContextMiddleware
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from app.api.registry import HandlerRegistry, register_contract_routes
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from app.compatibility import CompatibilityDimension, build_report, load_evidence_manifest
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from app.config import Settings, get_settings
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from app.contracts.model import Snapshot
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from app.db.pool import AsyncpgDatabase, Database
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from app.handlers.core import build_core_handlers
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from app.lifespan import DatabaseFactory, WorkerFactory, create_lifespan, default_database_factory
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from app.logging import configure_logging
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from app.observability.health import router as health_router
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from app.simulation.clock import AcceleratedClock
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from app.tasks.qemu import qemu_handler
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from app.tasks.repository import TaskRepository
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from app.tasks.worker import TaskWorker
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def create_app(
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settings: Settings | None = None,
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database_factory: DatabaseFactory = default_database_factory,
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handlers: HandlerRegistry | None = None,
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worker_factories: tuple[WorkerFactory, ...] | None = None,
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) -> FastAPI:
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"""Create an isolated application instance with explicit resource factories."""
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resolved = settings or get_settings()
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configure_logging(resolved.log_level)
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resolved_workers = worker_factories
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if resolved_workers is None and resolved.contract_snapshot is not None and handlers is None:
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def task_worker(database: Database) -> TaskWorker:
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adapter = cast(AsyncpgDatabase, database)
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repository = TaskRepository(adapter.pool)
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handler = qemu_handler(repository, AcceleratedClock(resolved.simulation_time_scale))
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return TaskWorker(
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repository,
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"simulator-worker",
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{
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"qemu-clone": handler,
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"qemu-create": handler,
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"qemu-delete": handler,
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"qemu-reboot": handler,
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"qemu-reset": handler,
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"qemu-resume": handler,
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"qemu-shutdown": handler,
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"qemu-migrate": handler,
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"qemu-snapshot-create": handler,
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"qemu-snapshot-delete": handler,
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"qemu-snapshot-rollback": handler,
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"qemu-start": handler,
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"qemu-stop": handler,
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"qemu-suspend": handler,
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"qemu-update": handler,
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},
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concurrency=resolved.task_worker_concurrency,
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lease_seconds=resolved.task_lease_seconds,
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)
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resolved_workers = (task_worker,)
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app = FastAPI(
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title=resolved.app_name,
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version="0.1.0",
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lifespan=create_lifespan(resolved, database_factory, resolved_workers or ()),
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)
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app.state.settings = resolved
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app.add_middleware(RequestContextMiddleware, header_name=resolved.request_id_header)
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app.add_exception_handler(Exception, unhandled_exception_handler)
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app.add_exception_handler(ApiError, api_error_handler)
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app.include_router(health_router)
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if resolved.contract_snapshot is not None:
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snapshot = Snapshot.model_validate_json(resolved.contract_snapshot.read_bytes())
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resolved_handlers = handlers or build_core_handlers(resolved)
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register_contract_routes(
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app,
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snapshot,
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resolved_handlers,
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resolved.contract_fallback,
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)
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declared = frozenset(
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(path.path, method.verb) for path in snapshot.paths for method in path.methods
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)
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dimensions = {CompatibilityDimension.ROUTE_METHOD: declared}
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if resolved.compatibility_evidence is not None:
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evidence = load_evidence_manifest(resolved.compatibility_evidence)
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if evidence.source_version != snapshot.source_version:
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raise ValueError("compatibility evidence version does not match contract")
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dimensions.update(evidence.dimension_map())
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dimensions[CompatibilityDimension.ROUTE_METHOD] = declared
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report = build_report(
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snapshot,
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implemented=resolved_handlers.keys() & declared,
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dimensions=dimensions,
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)
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@app.get("/admin/compatibility", include_in_schema=False)
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async def compatibility_report() -> dict[str, object]:
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return report.as_json()
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@app.get("/admin/compatibility.md", include_in_schema=False)
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async def compatibility_report_markdown() -> Response:
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return Response(report.as_markdown(), media_type="text/markdown")
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@app.get("/admin/compatibility.html", include_in_schema=False)
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async def compatibility_report_html() -> Response:
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return Response(report.as_html(), media_type="text/html")
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return app
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app = create_app()
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