59 lines
1.7 KiB
Python
59 lines
1.7 KiB
Python
# coding: utf-8
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"""
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This module contains a Bottle plugin to pass the database argument to any route
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which needs it.
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"""
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from __future__ import (
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absolute_import, division, print_function, unicode_literals
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)
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import functools
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import inspect
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import bottle
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class DatabasePlugin(object):
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name = 'database'
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api = 2
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KEYWORD = "db"
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def __init__(self, get_session):
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"""
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:param keyword: Keyword used to inject session database in a route
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:param create_session: SQLAlchemy session maker created with the
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'sessionmaker' function. Will create its own if undefined.
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"""
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self.get_session = get_session
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def setup(self, app):
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"""
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Make sure that other installed plugins don't affect the same
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keyword argument and check if metadata is available.
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"""
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for other in app.plugins:
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if not isinstance(other, DatabasePlugin):
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continue
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else:
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raise bottle.PluginError(
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"Found another conflicting Database plugin."
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)
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def apply(self, callback, route):
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try:
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callback_args = inspect.signature(route.callback).parameters
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except AttributeError:
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# inspect.signature does not exist on older Python
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callback_args = inspect.getargspec(route.callback).args
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if self.KEYWORD not in callback_args:
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return callback
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else:
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with self.get_session() as session:
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kwargs = {}
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kwargs[self.KEYWORD] = session
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return functools.partial(callback, **kwargs)
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Plugin = DatabasePlugin
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