Sergey Antropoff
47 lines
1.7 KiB
Python
47 lines
1.7 KiB
Python
"""FastAPI application factory and ASGI entry point."""
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from __future__ import annotations
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from fastapi import FastAPI
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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.config import Settings, get_settings
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from app.contracts.model import Snapshot
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from app.lifespan import DatabaseFactory, 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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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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) -> 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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app = FastAPI(
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title=resolved.app_name,
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version="0.0.1",
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lifespan=create_lifespan(resolved, database_factory),
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)
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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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register_contract_routes(
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app,
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snapshot,
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handlers or HandlerRegistry(),
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resolved.contract_fallback,
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)
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return app
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app = create_app()
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