python-dependency-injector/examples/miniapps/services/application.py

"""Example of several Dependency Injector IoC containers."""

import sqlite3
import boto.s3.connection
import example.services

import dependency_injector.containers as containers
import dependency_injector.providers as providers


class Platform(containers.DeclarativeContainer):
    """IoC container of platform service providers."""

    database = providers.Singleton(sqlite3.connect, ':memory:')

    s3 = providers.Singleton(boto.s3.connection.S3Connection,
                             aws_access_key_id='KEY',
                             aws_secret_access_key='SECRET')


class Services(containers.DeclarativeContainer):
    """IoC container of business service providers."""

    users = providers.Factory(example.services.Users,
                              db=Platform.database)

    auth = providers.Factory(example.services.Auth,
                             db=Platform.database,
                             token_ttl=3600)

    photos = providers.Factory(example.services.Photos,
                               db=Platform.database,
                               s3=Platform.s3)