fastapi-lifespan-di

What problem does it solve?

This Skill helps developers safely manage the lifecycle of async resources in FastAPI applications by using a lifespan context manager and simple, type-safe dependency injection to ensure resources are initialized on startup and cleaned up on shutdown.

Core Features & Use Cases

• Lifespan-based resource lifecycle management (initialize on startup, cleanup on exit) for resources like HTTP clients and database connections.
• Type-safe dependency injection through getter functions to provide resources to route handlers.
• Shared resources across multiple routes with predictable initialization and teardown, reducing boilerplate and errors.

Quick Start

Create a FastAPI app that uses a lifespan context to initialize resources and exposes getter functions for handlers. For example, define a lifespan that creates an HTTP client and a database service, then use get_http_client and get_db_service in route handlers to access them.