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https://github.com/ets-labs/python-dependency-injector.git
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62 lines
1.6 KiB
Python
62 lines
1.6 KiB
Python
"""`@inject` decorator example.
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Flask is required to make this example work.
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"""
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import sqlite3
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from flask import Flask
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from objects.providers import NewInstance
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from objects.providers import Singleton
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from objects.injections import KwArg
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from objects.injections import Attribute
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from objects.decorators import inject
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class ObjectA(object):
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"""ObjectA has dependency on database."""
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def __init__(self, database):
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"""Initializer.
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Database dependency need to be injected via init arg."""
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self.database = database
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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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# Database and `ObjectA` providers.
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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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object_a = NewInstance(ObjectA,
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KwArg('database', database))
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# Flask application.
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app = Flask(__name__)
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# Flask view with inject decorator.
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@app.route('/')
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@inject(KwArg('database', database))
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@inject(KwArg('object_a', object_a))
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def hello(database):
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one = database.execute('SELECT 1').fetchone()[0]
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return 'Query returned {0}, db connection {1}'.format(one, database)
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if __name__ == '__main__':
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app.run()
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# Example output of "GET / HTTP/1.1" is:
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# Query returned 1, db connection <sqlite3.Connection object at 0x1057e4030>
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