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Framework agnostic dependency injections

Project description

Knot Injector
========

Framework agnostic dependency injections

This library build as a wrapper for `Knot`_ Dependencies Container.


Installation
------------

``pip install knot-injector``

Usage
-----

Example:

.. code:: python

import sqlalchemy as db
from sqlalchemy.orm import sessionmaker

from knot_injector import Container

registry = Container()

settings = {
'db': {
'uri': 'sqlite://',
'echo': False,
'encoding': 'utf8',
},
}

registry.add_service(lambda _: settings, name='settings')

@registry.service()
def dbengine(container, settings):
uri = settings['db']['uri']
return create_engine(uri, **settings['db'])

@registry.factory(name='dbsession')
def database_session(container, dbengine):
session = sessionmaker()
session.configure(bind=dbengine)
return session()


class ItemResource(object):

@registry.inject
def on_get(request, response, item_id, dbsession):
response.data = dbsession.query(Item).filter(Item.id == item_id).one()


.. _Knot: https://github.com/jaapverloop/knot

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