dependency-injector-4.10.0_bug-config-provider

bug.py

import sys

from dependency_injector import providers, containers


class MyService(object):
    def __init__(self, config: dict):
        self.key = config.pop('key')

    def trigger(self):
        print('> Service: success')


class MyDevice(object):
    def __init__(self, service: MyService):
        # doesn't raise an error because it's an instance of
        # dependency_injector.providers.Singleton
        self.service = service

    def do_something(self):
        # raises "AttributeError: 'NoneType' object has no attribute 'get'"
        print('> Device: triggering service')
        self.service().trigger()


class ServiceContainer(containers.DeclarativeContainer):
    config = providers.Configuration(strict=True)

    myservice = providers.Singleton(MyService, config=config.myservice.required())


class Container(containers.DeclarativeContainer):
    config = providers.Configuration()

    services = providers.Container(ServiceContainer, config=config.services)

    mydevice = providers.Factory(MyDevice)


def print_version():
    import dependency_injector
    print(f'dependency-injector v{dependency_injector.__version__}')


def execute(config: dict):
    container = Container()
    container.config.from_dict(config)
    container.init_resources()
    container.wire(modules=[sys.modules[__name__]])

    mydevice = container.mydevice(service=container.services.myservice)
    mydevice.do_something()


if __name__ == '__main__':
    print_version()

    print("\n### WORKING")
    working = {'services': {'myservice': {'key': 'foobar'}}}
    execute(working)

    print("\n### BUG")
    broken = {'key': 'foobar'}
    execute(broken)