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215 lines
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ReStructuredText
215 lines
8.6 KiB
ReStructuredText
===========================================================
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Dependency Injector - Python dependency injection framework
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===========================================================
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*Dependency Injector* is a Python dependency injection framework. It was
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designed to be unified, developer-friendly tool for managing any kind
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of Python objects and their dependencies in formal, pretty way.
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*Dependency Injector* framework key features are:
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+ Easy, smart, pythonic style.
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+ Obvious, clear structure.
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+ Extensibility and flexibility.
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+ Memory efficiency.
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+ Thread safety.
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+ Documentation.
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+ Semantic versioning.
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Status
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------
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+---------------------------------------+----------------------------------------------------------------------------------------+
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| *PyPi* | .. image:: https://img.shields.io/pypi/v/dependency_injector.svg |
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| | :target: https://pypi.python.org/pypi/dependency_injector/ |
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| | :alt: Latest Version |
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| | .. image:: https://img.shields.io/pypi/l/dependency_injector.svg |
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| | :target: https://pypi.python.org/pypi/dependency_injector/ |
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| | :alt: License |
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+---------------------------------------+----------------------------------------------------------------------------------------+
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| *Python versions and implementations* | .. image:: https://img.shields.io/pypi/pyversions/dependency_injector.svg |
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| | :target: https://pypi.python.org/pypi/dependency_injector/ |
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| | :alt: Supported Python versions |
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| | .. image:: https://img.shields.io/pypi/implementation/dependency_injector.svg |
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| | :target: https://pypi.python.org/pypi/dependency_injector/ |
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| | :alt: Supported Python implementations |
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+---------------------------------------+----------------------------------------------------------------------------------------+
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| *Builds and tests coverage* | .. image:: https://travis-ci.org/ets-labs/python-dependency-injector.svg?branch=master |
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| | :target: https://travis-ci.org/ets-labs/python-dependency-injector |
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| | :alt: Build Status |
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| | .. image:: https://coveralls.io/repos/ets-labs/python-dependency-injector/badge.svg |
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| | :target: https://coveralls.io/r/ets-labs/python-dependency-injector |
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| | :alt: Coverage Status |
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+---------------------------------------+----------------------------------------------------------------------------------------+
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Installation
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------------
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*Dependency Injector* library is available on PyPi_::
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pip install dependency_injector
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Example
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-------
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Brief example below demonstrates usage of *Dependency Injector* containers and
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providers for definition of several IoC containers for some microservice
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system that consists from several business and platform services:
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.. code-block:: python
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"""Example of several Dependency Injector IoC containers."""
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import sqlite3
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import boto.s3.connection
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import example.services
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from dependency_injector import containers
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from dependency_injector import providers
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class Platform(containers.DeclarativeContainer):
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"""Container of platform service providers."""
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database = providers.Singleton(sqlite3.connect, ':memory:')
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s3 = providers.Singleton(boto.s3.connection.S3Connection,
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aws_access_key_id='KEY',
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aws_secret_access_key='SECRET')
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class Services(containers.DeclarativeContainer):
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"""Container of business service providers."""
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users = providers.Factory(example.services.Users,
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db=Platform.database)
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photos = providers.Factory(example.services.Photos,
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db=Platform.database,
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s3=Platform.s3)
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auth = providers.Factory(example.services.Auth,
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db=Platform.database,
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token_ttl=3600)
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Next example demonstrates usage of ``@inject`` decorator with IoC containers
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defined above:
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.. code-block:: python
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"""Dependency Injector @inject decorator example."""
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from dependency_injector.injections import inject
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from containers import Services
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@inject(users_service=Services.users)
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@inject(auth_service=Services.auth)
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@inject(photos_service=Services.photos)
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def main(users_service, auth_service, photos_service):
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"""Main function."""
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user = users_service.get_user('user')
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auth_service.authenticate(user, 'secret')
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photos_service.upload_photo(user['id'], 'photo.jpg')
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if __name__ == '__main__':
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main()
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Alternative definition styles
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*Dependecy Injector* supports few other styles of dependency injections
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definition.
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IoC containers from previous example could look like these:
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.. code-block:: python
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class Platform(containers.DeclarativeContainer):
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"""Container of platform service providers."""
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database = providers.Singleton(sqlite3.connect) \
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.add_args(':memory:')
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s3 = providers.Singleton(boto.s3.connection.S3Connection) \
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.add_kwargs(aws_access_key_id='KEY',
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aws_secret_access_key='SECRET')
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class Services(containers.DeclarativeContainer):
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"""Container of business service providers."""
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users = providers.Factory(example.services.Users) \
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.add_kwargs(db=Platform.database)
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photos = providers.Factory(example.services.Photos) \
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.add_kwargs(db=Platform.database,
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s3=Platform.s3)
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auth = providers.Factory(example.services.Auth) \
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.add_kwargs(db=Platform.database,
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token_ttl=3600)
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or like this these:
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.. code-block:: python
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class Platform(containers.DeclarativeContainer):
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"""Container of platform service providers."""
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database = providers.Singleton(sqlite3.connect)
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database.add_args(':memory:')
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s3 = providers.Singleton(boto.s3.connection.S3Connection)
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s3.add_kwargs(aws_access_key_id='KEY',
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aws_secret_access_key='SECRET')
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class Services(containers.DeclarativeContainer):
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"""Container of business service providers."""
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users = providers.Factory(example.services.Users)
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users.add_kwargs(db=Platform.database)
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photos = providers.Factory(example.services.Photos)
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photos.add_kwargs(db=Platform.database,
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s3=Platform.s3)
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auth = providers.Factory(example.services.Auth)
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auth.add_kwargs(db=Platform.database,
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token_ttl=3600)
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You can get more *Dependency Injector* examples in ``/examples`` directory on
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GitHub:
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https://github.com/ets-labs/python-dependency-injector
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Documentation
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-------------
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*Dependency Injector* documentation is hosted on ReadTheDocs:
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- `User's guide`_
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- `API docs`_
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Feedback
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--------
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Feel free to post questions, bugs, feature requests, proposals etc. on
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*Dependency Injector* GitHub Issues:
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https://github.com/ets-labs/python-dependency-injector/issues
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Your feedback is quite important!
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.. _PyPi: https://pypi.python.org/pypi/dependency_injector
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.. _User's guide: http://python-dependency-injector.ets-labs.org/en/stable/
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.. _API docs: http://python-dependency-injector.ets-labs.org/en/stable/api/
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.. _SLOC: http://en.wikipedia.org/wiki/Source_lines_of_code
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.. _SOLID: http://en.wikipedia.org/wiki/SOLID_%28object-oriented_design%29
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.. _IoC: http://en.wikipedia.org/wiki/Inversion_of_control
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.. _dependency injection: http://en.wikipedia.org/wiki/Dependency_injection
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