/usr/lib/python2.7/dist-packages/nss_cache/sources/source_factory.py is in nsscache 0.32-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software Foundation,
# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
"""Factory for data source implementations."""
__author__ = ('jaq@google.com (Jamie Wilkinson)',
'vasilios@google.com (Vasilios Hoffman)')
_source_implementations = {}
def RegisterImplementation(source):
"""Register a Source implementation with the factory method.
Sources being registered are expected to have a name attribute,
unique to themselves.
Child modules are expected to call this method in the file-level
scope.
Args:
source: A class type that is a subclass of Source
Returns:
Nothing
Raises:
RuntimeError: no 'name' entry in this source.
"""
global _source_implementations
if 'name' not in source.__dict__:
raise RuntimeError("'name' not defined in Source %r" % (source,))
_source_implementations[source.name] = source
# Discover all the known implementations of sources.
from nss_cache.sources import httpsource
from nss_cache.sources import ldapsource
from nss_cache.sources import consulsource
httpsource.RegisterImplementation(RegisterImplementation)
ldapsource.RegisterImplementation(RegisterImplementation)
consulsource.RegisterImplementation(RegisterImplementation)
# Don't load the zsync source if zsync python module isn't there.
try:
from nss_cache.sources import zsyncsource
zsyncsource.RegisterImplementation(RegisterImplementation)
except ImportError:
pass
def Create(conf):
"""Source creation factory method.
Args:
conf: a dictionary of configuration key/value pairs, including one
required attribute 'name'.
Returns:
A Source instance.
Raises:
RuntimeError: no sources are registered with RegisterImplementation
"""
global _source_implementations
if not _source_implementations:
raise RuntimeError('no source implementations exist')
source_name = conf['name']
if source_name not in _source_implementations.keys():
raise RuntimeError('source not implemented: %r' % (source_name,))
return _source_implementations[source_name](conf)
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