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https://github.com/ets-labs/python-dependency-injector.git
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69 lines
1.8 KiB
Python
69 lines
1.8 KiB
Python
"""Catalogs example."""
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import sqlite3
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import httplib
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from objects.catalog import AbstractCatalog
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from objects.providers import Singleton
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from objects.providers import NewInstance
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from objects.injections import KwArg
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from objects.injections import Attribute
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class SomeModel(object):
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"""SomeModel has dependency on database and api client.
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Dependencies need to be injected via init args.
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"""
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def __init__(self, database, api_client):
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"""Initializer."""
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self.database = database
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self.api_client = api_client
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def api_request(self):
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"""Make api request."""
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self.api_client.request('GET', '/')
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return self.api_client.getresponse()
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def get_one(self):
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"""Select one from database and return it."""
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return self.database.execute('SELECT 1').fetchone()[0]
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class Resources(AbstractCatalog):
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"""Resource providers catalog."""
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database = Singleton(sqlite3.Connection,
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KwArg('database', ':memory:'),
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KwArg('timeout', 30),
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KwArg('detect_types', True),
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KwArg('isolation_level', 'EXCLUSIVE'),
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Attribute('row_factory', sqlite3.Row))
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api_client = Singleton(httplib.HTTPConnection,
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KwArg('host', 'example.com'),
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KwArg('port', 80),
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KwArg('timeout', 10))
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class Models(AbstractCatalog):
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"""Model providers catalog."""
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some_model = NewInstance(SomeModel,
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KwArg('database', Resources.database),
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KwArg('api_client', Resources.api_client))
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# Creating `SomeModel` instance.
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some_model = Models.some_model()
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# Making some asserts.
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assert some_model.get_one() == 1
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assert some_model.api_request().status == 200
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