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48 lines
1.3 KiB
Python
48 lines
1.3 KiB
Python
"""Declarative catalog's provider injections example."""
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import sqlite3
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from dependency_injector import catalogs
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from dependency_injector import providers
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class UsersService(object):
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"""Users service, that has dependency on database."""
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def __init__(self, db):
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"""Initializer."""
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self.db = db
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class AuthService(object):
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"""Auth service, that has dependencies on users service and database."""
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def __init__(self, db, users_service):
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"""Initializer."""
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self.db = db
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self.users_service = users_service
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class Services(catalogs.DeclarativeCatalog):
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"""Catalog of service providers."""
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database = providers.Singleton(sqlite3.connect, ':memory:')
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users = providers.Factory(UsersService,
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db=database)
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auth = providers.Factory(AuthService,
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db=database,
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users_service=users)
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# Retrieving service providers from catalog:
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users_service = Services.users()
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auth_service = Services.auth()
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# Making some asserts:
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assert users_service.db is auth_service.db is Services.database()
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assert isinstance(auth_service.users_service, UsersService)
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assert users_service is not Services.users()
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assert auth_service is not Services.auth()
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