python-dependency-injector/examples/wiring/flask_resource_closing.py

"""`Resource` - Flask request scope example."""

from dependency_injector import containers, providers
from dependency_injector.wiring import Closing, Provide, inject
from flask import Flask, current_app


class Service:
    ...


def init_service() -> Service:
    print("Init service")
    yield Service()
    print("Shutdown service")


class Container(containers.DeclarativeContainer):

    service = providers.Resource(init_service)


@inject
def index_view(service: Service = Closing[Provide[Container.service]]):
    assert service is current_app.container.service()
    return "Hello  World!"


container = Container()
container.wire(modules=[__name__])

app = Flask(__name__)
app.container = container
app.add_url_rule("/", "index", view_func=index_view)


if __name__ == "__main__":
    app.run()