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59 lines
1.9 KiB
Python
59 lines
1.9 KiB
Python
"""Example of dependency injection in Python."""
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import logging
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import sqlite3
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import boto3
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import example.main
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import example.services
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import dependency_injector.containers as containers
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import dependency_injector.providers as providers
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class Core(containers.DeclarativeContainer):
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"""IoC container of core component providers."""
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config = providers.Configuration('config')
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logger = providers.Singleton(logging.Logger, name='example')
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class Gateways(containers.DeclarativeContainer):
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"""IoC container of gateway (API clients to remote services) providers."""
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database = providers.Singleton(sqlite3.connect, Core.config.database.dsn)
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s3 = providers.Singleton(
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boto3.client, 's3',
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aws_access_key_id=Core.config.aws.access_key_id,
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aws_secret_access_key=Core.config.aws.secret_access_key)
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class Services(containers.DeclarativeContainer):
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"""IoC container of business service providers."""
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users = providers.Factory(example.services.UsersService,
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db=Gateways.database,
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logger=Core.logger)
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auth = providers.Factory(example.services.AuthService,
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db=Gateways.database,
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logger=Core.logger,
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token_ttl=Core.config.auth.token_ttl)
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photos = providers.Factory(example.services.PhotosService,
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db=Gateways.database,
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s3=Gateways.s3,
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logger=Core.logger)
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class Application(containers.DeclarativeContainer):
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"""IoC container of application component providers."""
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main = providers.Callable(example.main.main,
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users_service=Services.users,
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auth_service=Services.auth,
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photos_service=Services.photos)
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