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93 lines
2.6 KiB
93 lines
2.6 KiB
# Copyright 2010 Google Inc.
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#
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# Permission is hereby granted, free of charge, to any person obtaining a
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# copy of this software and associated documentation files (the
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# "Software"), to deal in the Software without restriction, including
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# without limitation the rights to use, copy, modify, merge, publish, dis-
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# tribute, sublicense, and/or sell copies of the Software, and to permit
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# persons to whom the Software is furnished to do so, subject to the fol-
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# lowing conditions:
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#
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# The above copyright notice and this permission notice shall be included
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# in all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABIL-
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# ITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
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# SHALL THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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# IN THE SOFTWARE.
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"""
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Implements plugin related api.
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To define a new plugin just subclass Plugin, like this.
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class AuthPlugin(Plugin):
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pass
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Then start creating subclasses of your new plugin.
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class MyFancyAuth(AuthPlugin):
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capability = ['sign', 'vmac']
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The actual interface is duck typed.
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"""
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import glob
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import imp
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import os.path
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class Plugin(object):
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"""Base class for all plugins."""
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capability = []
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@classmethod
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def is_capable(cls, requested_capability):
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"""Returns true if the requested capability is supported by this plugin
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"""
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for c in requested_capability:
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if c not in cls.capability:
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return False
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return True
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def get_plugin(cls, requested_capability=None):
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if not requested_capability:
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requested_capability = []
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result = []
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for handler in cls.__subclasses__():
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if handler.is_capable(requested_capability):
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result.append(handler)
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return result
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def _import_module(filename):
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(path, name) = os.path.split(filename)
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(name, ext) = os.path.splitext(name)
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(file, filename, data) = imp.find_module(name, [path])
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try:
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return imp.load_module(name, file, filename, data)
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finally:
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if file:
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file.close()
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_plugin_loaded = False
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def load_plugins(config):
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global _plugin_loaded
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if _plugin_loaded:
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return
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_plugin_loaded = True
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if not config.has_option('Plugin', 'plugin_directory'):
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return
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directory = config.get('Plugin', 'plugin_directory')
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for file in glob.glob(os.path.join(directory, '*.py')):
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_import_module(file)
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