Async providers with async dependencies #368
Description
It turns out that async providers currently cannot have async dependencies.
Example: in this container, both are async functions:
class Container(containers.DeclarativeContainer): db = providers.Factory(async_db_provider) service = providers.Singleton(async_service, db=db)Now, when in my code I request an instance of service:
service = await container.service()the expected result would be an instance of service. The actual result is its unawaited coroutine:
<coroutine object async_service at 0x7faea530fc40>
This behavior persists with Resource, Couroutine, and other providers.
Full source code to reproduce:
# Create two async providers async def async_db_provider(): return {'db': 'ok'} # just some sample object async def async_service(db = None): return {'service': 'ok', 'db': db} class Container(containers.DeclarativeContainer): # Second provider, a singleton, depends on the first one db = providers.Factory(async_db_provider) service = providers.Singleton(async_service, db=db) if __name__ == '__main__': # Create the container container = Container() async def main(): try: # Request the service service = await container.service() print(service) # <--- expected: instance of service finally: # Shutdown resources shutdown_resources_awaitable = container.shutdown_resources() if isawaitable(shutdown_resources_awaitable): await shutdown_resources_awaitable asyncio.run(main())