wireup 0.9.0

Python Dependency Injection Library

Wireup

Modern Dependency Injection for Python.

Wireup is a performant, concise, and easy-to-use dependency injection container for Python 3.8+.

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⚡ Key Features

• Inject services and configuration.
• Interfaces and abstract classes.
• Factory pattern.
• Singleton and transient dependencies.
• Framework-agnostic.
• Apply the container anywhere as a decorator
• Service Locator
• Simplified use with Django, Flask, and FastAPI.

📋 Quickstart

Example showcasing a Redis wrapper and a weather service that calls an external API and caches results as needed.

1. Set up

from wireup import container, initialize_container

def create_app():
    app = ...

    # ⬇️ Start the container: Register and initialize services.
    initialize_container(
        container,
        # Parameters serve as application/service configuration.
        parameters={
            "redis_url": os.environ["APP_REDIS_URL"],
            "weather_api_key": os.environ["APP_WEATHER_API_KEY"]
        },
        # Top-level modules containing service registrations.
        service_modules=[services]
    )

    return app

2. Register services

Use a declarative syntax to describe services, and let the container handle the rest.

from wireup import service, Inject

@service # ⬅️ Decorator tells the container this is a service.
class KeyValueStore:
    # Inject the value of the parameter during creation. ⬇️ 
    def __init__(self, dsn: Annotated[str, Inject(param="redis_url")]):
        self.client = redis.from_url(dsn)

    def get(self, key: str) -> Any: ...
    def set(self, key: str, value: Any): ...


@service
@dataclass # Can be used alongside dataclasses to simplify init boilerplate.
class WeatherService:
    # Inject the value of the parameter to this field. ⬇️
    api_key: Annotated[str, Inject(param="weather_api_key")]
    kv_store: KeyValueStore # ⬅️ This will be injected automatically.

    def get_forecast(self, lat: float, lon: float) -> WeatherForecast:
        ...

3. Inject

Decorate targets where the library should perform injection.

from wireup import container

@app.get("/weather/forecast")
# ⬇️ Decorate functions to perform Dependency Injection.
@container.autowire
def get_weather_forecast_view(weather_service: WeatherService, request):
    return weather_service.get_forecast(request.lat, request.lon)

Installation

# Install using poetry:
poetry add wireup

# Install using pip:
pip install wireup

📑 Documentation

For more information check out the documentation

🎮 Demo application

A demo flask application is available at maldoinc/wireup-demo