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4284d4fb4d
Allow multiple incompatible versions of a plugin using the same name. The current plugins are assumed to be version '1'. The unique identifier of plugins was changed from plugin name to plugin name and version. By default, the highest version available at build time is used. If the plugin is an unknown remote plugin, version of '1' is used by default. https://fedorahosted.org/freeipa/ticket/4427 Reviewed-By: David Kupka <dkupka@redhat.com>
770 lines
24 KiB
Python
770 lines
24 KiB
Python
# Authors:
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# Jason Gerard DeRose <jderose@redhat.com>
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#
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# Copyright (C) 2008 Red Hat
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# see file 'COPYING' for use and warranty information
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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"""
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Plugin framework.
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The classes in this module make heavy use of Python container emulation. If
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you are unfamiliar with this Python feature, see
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http://docs.python.org/ref/sequence-types.html
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"""
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from distutils.version import LooseVersion
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import operator
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import sys
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import threading
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import os
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from os import path
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import optparse
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import textwrap
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import collections
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import importlib
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import six
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from ipalib import errors
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from ipalib.config import Env
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from ipalib.text import _
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from ipalib.util import classproperty
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from ipalib.base import ReadOnly, lock, islocked
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from ipalib.constants import DEFAULT_CONFIG
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from ipapython.ipa_log_manager import (
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log_mgr,
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LOGGING_FORMAT_FILE,
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LOGGING_FORMAT_STDERR)
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from ipapython.version import VERSION, API_VERSION, DEFAULT_PLUGINS
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if six.PY3:
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unicode = str
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# FIXME: Updated constants.TYPE_ERROR to use this clearer format from wehjit:
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TYPE_ERROR = '%s: need a %r; got a %r: %r'
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# FIXME: This function has no unit test
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def find_modules_in_dir(src_dir):
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"""
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Iterate through module names found in ``src_dir``.
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"""
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if not (os.path.abspath(src_dir) == src_dir and os.path.isdir(src_dir)):
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return
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if os.path.islink(src_dir):
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return
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suffix = '.py'
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for name in sorted(os.listdir(src_dir)):
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if not name.endswith(suffix):
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continue
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pyfile = os.path.join(src_dir, name)
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if not os.path.isfile(pyfile):
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continue
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module = name[:-len(suffix)]
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if module == '__init__':
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continue
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yield module
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class Registry(object):
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"""A decorator that makes plugins available to the API
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Usage::
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register = Registry()
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@register()
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class obj_mod(...):
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...
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For forward compatibility, make sure that the module-level instance of
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this object is named "register".
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"""
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def __init__(self):
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self.__registry = collections.OrderedDict()
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def __call__(self, **kwargs):
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def register(plugin):
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"""
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Register the plugin ``plugin``.
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:param plugin: A subclass of `Plugin` to attempt to register.
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"""
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if not callable(plugin):
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raise TypeError('plugin must be callable; got %r' % plugin)
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# Raise DuplicateError if this exact class was already registered:
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if plugin in self.__registry:
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raise errors.PluginDuplicateError(plugin=plugin)
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# The plugin is okay, add to __registry:
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self.__registry[plugin] = dict(kwargs, plugin=plugin)
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return plugin
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return register
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def __iter__(self):
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return iter(self.__registry.values())
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class Plugin(ReadOnly):
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"""
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Base class for all plugins.
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"""
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version = '1'
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def __init__(self, api):
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assert api is not None
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self.__api = api
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self.__finalize_called = False
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self.__finalized = False
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self.__finalize_lock = threading.RLock()
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log_mgr.get_logger(self, True)
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@classmethod
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def __name_getter(cls):
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return cls.__name__
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# you know nothing, pylint
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name = classproperty(__name_getter)
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@classmethod
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def __full_name_getter(cls):
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return '{}/{}'.format(cls.name, cls.version)
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full_name = classproperty(__full_name_getter)
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@classmethod
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def __bases_getter(cls):
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return cls.__bases__
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bases = classproperty(__bases_getter)
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@property
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def doc(self):
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return type(self).__doc__
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@property
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def summary(self):
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doc = self.doc
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if not _(doc).msg:
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cls = type(self)
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return u'<%s.%s>' % (cls.__module__, cls.__name__)
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else:
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return unicode(doc).split('\n\n', 1)[0].strip()
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@property
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def api(self):
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"""
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Return `API` instance passed to `__init__()`.
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"""
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return self.__api
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# FIXME: for backward compatibility only
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@property
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def env(self):
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return self.__api.env
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# FIXME: for backward compatibility only
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@property
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def Backend(self):
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return self.__api.Backend
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# FIXME: for backward compatibility only
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@property
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def Command(self):
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return self.__api.Command
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def finalize(self):
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"""
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Finalize plugin initialization.
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This method calls `_on_finalize()` and locks the plugin object.
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Subclasses should not override this method. Custom finalization is done
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in `_on_finalize()`.
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"""
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with self.__finalize_lock:
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assert self.__finalized is False
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if self.__finalize_called:
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# No recursive calls!
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return
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self.__finalize_called = True
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self._on_finalize()
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self.__finalized = True
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if not self.__api.is_production_mode():
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lock(self)
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def _on_finalize(self):
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"""
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Do custom finalization.
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This method is called from `finalize()`. Subclasses can override this
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method in order to add custom finalization.
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"""
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pass
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def ensure_finalized(self):
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"""
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Finalize plugin initialization if it has not yet been finalized.
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"""
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with self.__finalize_lock:
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if not self.__finalized:
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self.finalize()
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class finalize_attr(object):
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"""
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Create a stub object for plugin attribute that isn't set until the
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finalization of the plugin initialization.
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When the stub object is accessed, it calls `ensure_finalized()` to make
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sure the plugin initialization is finalized. The stub object is expected
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to be replaced with the actual attribute value during the finalization
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(preferably in `_on_finalize()`), otherwise an `AttributeError` is
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raised.
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This is used to implement on-demand finalization of plugin
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initialization.
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"""
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__slots__ = ('name', 'value')
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def __init__(self, name, value=None):
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self.name = name
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self.value = value
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def __get__(self, obj, cls):
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if obj is None or obj.api is None:
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return self.value
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obj.ensure_finalized()
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try:
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return getattr(obj, self.name)
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except RuntimeError:
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# If the actual attribute value is not set in _on_finalize(),
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# getattr() calls __get__() again, which leads to infinite
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# recursion. This can happen only if the plugin is written
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# badly, so advise the developer about that instead of giving
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# them a generic "maximum recursion depth exceeded" error.
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raise AttributeError(
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"attribute '%s' of plugin '%s' was not set in finalize()" % (self.name, obj.name)
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)
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def __repr__(self):
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"""
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Return 'module_name.class_name()' representation.
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This representation could be used to instantiate this Plugin
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instance given the appropriate environment.
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"""
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return '%s.%s()' % (
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self.__class__.__module__,
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self.__class__.__name__
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)
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class APINameSpace(collections.Mapping):
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def __init__(self, api, base):
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self.__api = api
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self.__base = base
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self.__plugins = None
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self.__plugins_by_key = None
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def __enumerate(self):
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if self.__plugins is not None and self.__plugins_by_key is not None:
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return
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default_map = self.__api._API__default_map
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plugins = set()
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key_dict = self.__plugins_by_key = {}
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for plugin in self.__api._API__plugins:
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if not any(issubclass(b, self.__base) for b in plugin.bases):
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continue
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plugins.add(plugin)
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key_dict[plugin] = plugin
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key_dict[plugin.name, plugin.version] = plugin
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key_dict[plugin.full_name] = plugin
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if plugin.version == default_map.get(plugin.name, '1'):
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key_dict[plugin.name] = plugin
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self.__plugins = sorted(plugins, key=operator.attrgetter('full_name'))
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def __len__(self):
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self.__enumerate()
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return len(self.__plugins)
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def __contains__(self, key):
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self.__enumerate()
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return key in self.__plugins_by_key
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def __iter__(self):
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self.__enumerate()
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return iter(self.__plugins)
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def __getitem__(self, key):
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self.__enumerate()
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plugin = self.__plugins_by_key[key]
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return self.__api._get(plugin)
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def __call__(self):
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return six.itervalues(self)
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def __getattr__(self, key):
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try:
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return self[key]
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except KeyError:
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raise AttributeError(key)
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class API(ReadOnly):
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"""
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Dynamic API object through which `Plugin` instances are accessed.
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"""
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def __init__(self):
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super(API, self).__init__()
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self.__plugins = set()
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self.__plugins_by_key = {}
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self.__default_map = {}
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self.__instances = {}
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self.__next = {}
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self.__done = set()
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self.env = Env()
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@property
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def bases(self):
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raise NotImplementedError
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@property
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def packages(self):
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raise NotImplementedError
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def __len__(self):
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"""
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Return the number of plugin namespaces in this API object.
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"""
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return len(self.bases)
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def __iter__(self):
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"""
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Iterate (in ascending order) through plugin namespace names.
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"""
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return (base.__name__ for base in self.bases)
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def __contains__(self, name):
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"""
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Return True if this API object contains plugin namespace ``name``.
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:param name: The plugin namespace name to test for membership.
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"""
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return name in set(self)
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def __getitem__(self, name):
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"""
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Return the plugin namespace corresponding to ``name``.
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:param name: The name of the plugin namespace you wish to retrieve.
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"""
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if name in self:
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try:
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return getattr(self, name)
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except AttributeError:
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pass
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raise KeyError(name)
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def __call__(self):
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"""
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Iterate (in ascending order by name) through plugin namespaces.
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"""
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for name in self:
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try:
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yield getattr(self, name)
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except AttributeError:
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raise KeyError(name)
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def is_production_mode(self):
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"""
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If the object has self.env.mode defined and that mode is
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production return True, otherwise return False.
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"""
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return getattr(self.env, 'mode', None) == 'production'
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def __doing(self, name):
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if name in self.__done:
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raise Exception(
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'%s.%s() already called' % (self.__class__.__name__, name)
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)
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self.__done.add(name)
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def __do_if_not_done(self, name):
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if name not in self.__done:
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getattr(self, name)()
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def isdone(self, name):
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return name in self.__done
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def bootstrap(self, parser=None, **overrides):
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"""
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Initialize environment variables and logging.
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"""
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self.__doing('bootstrap')
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self.log_mgr = log_mgr
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log = log_mgr.root_logger
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self.log = log
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self.env._bootstrap(**overrides)
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self.env._finalize_core(**dict(DEFAULT_CONFIG))
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# Add the argument parser
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if not parser:
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parser = self.build_global_parser()
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self.parser = parser
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# If logging has already been configured somewhere else (like in the
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# installer), don't add handlers or change levels:
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if log_mgr.configure_state != 'default' or self.env.validate_api:
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return
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log_mgr.default_level = 'info'
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log_mgr.configure_from_env(self.env, configure_state='api')
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# Add stderr handler:
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level = 'info'
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if self.env.debug:
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level = 'debug'
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else:
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if self.env.context == 'cli':
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if self.env.verbose > 0:
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level = 'info'
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else:
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level = 'warning'
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if 'console' in log_mgr.handlers:
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log_mgr.remove_handler('console')
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log_mgr.create_log_handlers([dict(name='console',
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stream=sys.stderr,
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level=level,
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format=LOGGING_FORMAT_STDERR)])
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# Add file handler:
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if self.env.mode in ('dummy', 'unit_test'):
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return # But not if in unit-test mode
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if self.env.log is None:
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return
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log_dir = path.dirname(self.env.log)
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if not path.isdir(log_dir):
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try:
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os.makedirs(log_dir)
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except OSError:
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log.error('Could not create log_dir %r', log_dir)
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return
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level = 'info'
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if self.env.debug:
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level = 'debug'
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try:
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log_mgr.create_log_handlers([dict(name='file',
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filename=self.env.log,
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level=level,
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format=LOGGING_FORMAT_FILE)])
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except IOError as e:
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log.error('Cannot open log file %r: %s', self.env.log, e)
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return
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def build_global_parser(self, parser=None, context=None):
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"""
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Add global options to an optparse.OptionParser instance.
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"""
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if parser is None:
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parser = optparse.OptionParser(
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add_help_option=False,
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formatter=IPAHelpFormatter(),
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usage='%prog [global-options] COMMAND [command-options]',
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description='Manage an IPA domain',
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version=('VERSION: %s, API_VERSION: %s'
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% (VERSION, API_VERSION)),
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epilog='\n'.join([
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'See "ipa help topics" for available help topics.',
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'See "ipa help <TOPIC>" for more information on a '
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'specific topic.',
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'See "ipa help commands" for the full list of commands.',
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'See "ipa <COMMAND> --help" for more information on a '
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'specific command.',
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]))
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parser.disable_interspersed_args()
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parser.add_option("-h", "--help", action="help",
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help='Show this help message and exit')
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parser.add_option('-e', dest='env', metavar='KEY=VAL', action='append',
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help='Set environment variable KEY to VAL',
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)
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parser.add_option('-c', dest='conf', metavar='FILE',
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help='Load configuration from FILE',
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)
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parser.add_option('-d', '--debug', action='store_true',
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help='Produce full debuging output',
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)
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parser.add_option('--delegate', action='store_true',
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help='Delegate the TGT to the IPA server',
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)
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parser.add_option('-v', '--verbose', action='count',
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help='Produce more verbose output. A second -v displays the XML-RPC request',
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)
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if context == 'cli':
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parser.add_option('-a', '--prompt-all', action='store_true',
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help='Prompt for ALL values (even if optional)'
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)
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parser.add_option('-n', '--no-prompt', action='store_false',
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dest='interactive',
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help='Prompt for NO values (even if required)'
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)
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parser.add_option('-f', '--no-fallback', action='store_false',
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dest='fallback',
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help='Only use the server configured in /etc/ipa/default.conf'
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)
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return parser
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def bootstrap_with_global_options(self, parser=None, context=None):
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parser = self.build_global_parser(parser, context)
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(options, args) = parser.parse_args()
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overrides = {}
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if options.env is not None:
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assert type(options.env) is list
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for item in options.env:
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try:
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(key, value) = item.split('=', 1)
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except ValueError:
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# FIXME: this should raise an IPA exception with an
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# error code.
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# --Jason, 2008-10-31
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pass
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overrides[str(key.strip())] = value.strip()
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for key in ('conf', 'debug', 'verbose', 'prompt_all', 'interactive',
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'fallback', 'delegate'):
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value = getattr(options, key, None)
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if value is not None:
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overrides[key] = value
|
|
if hasattr(options, 'prod'):
|
|
overrides['webui_prod'] = options.prod
|
|
if context is not None:
|
|
overrides['context'] = context
|
|
self.bootstrap(parser, **overrides)
|
|
return (options, args)
|
|
|
|
def load_plugins(self):
|
|
"""
|
|
Load plugins from all standard locations.
|
|
|
|
`API.bootstrap` will automatically be called if it hasn't been
|
|
already.
|
|
"""
|
|
self.__doing('load_plugins')
|
|
self.__do_if_not_done('bootstrap')
|
|
if self.env.mode in ('dummy', 'unit_test'):
|
|
return
|
|
for package in self.packages:
|
|
self.add_package(package)
|
|
|
|
# FIXME: This method has no unit test
|
|
def add_package(self, package):
|
|
"""
|
|
Add plugin modules from the ``package``.
|
|
|
|
:param package: A package from which to add modules.
|
|
"""
|
|
package_name = package.__name__
|
|
package_file = package.__file__
|
|
package_dir = path.dirname(path.abspath(package_file))
|
|
|
|
parent = sys.modules[package_name.rpartition('.')[0]]
|
|
parent_dir = path.dirname(path.abspath(parent.__file__))
|
|
if parent_dir == package_dir:
|
|
raise errors.PluginsPackageError(
|
|
name=package_name, file=package_file
|
|
)
|
|
|
|
self.log.debug("importing all plugin modules in %s...", package_name)
|
|
modules = getattr(package, 'modules', find_modules_in_dir(package_dir))
|
|
modules = ['.'.join((package_name, name)) for name in modules]
|
|
|
|
for name in modules:
|
|
self.log.debug("importing plugin module %s", name)
|
|
try:
|
|
module = importlib.import_module(name)
|
|
except errors.SkipPluginModule as e:
|
|
self.log.debug("skipping plugin module %s: %s", name, e.reason)
|
|
continue
|
|
except Exception as e:
|
|
if self.env.startup_traceback:
|
|
import traceback
|
|
self.log.error("could not load plugin module %s\n%s", name,
|
|
traceback.format_exc())
|
|
raise
|
|
|
|
try:
|
|
self.add_module(module)
|
|
except errors.PluginModuleError as e:
|
|
self.log.debug("%s", e)
|
|
|
|
def add_module(self, module):
|
|
"""
|
|
Add plugins from the ``module``.
|
|
|
|
:param module: A module from which to add plugins.
|
|
"""
|
|
try:
|
|
register = module.register
|
|
except AttributeError:
|
|
pass
|
|
else:
|
|
if isinstance(register, Registry):
|
|
for kwargs in register:
|
|
self.add_plugin(**kwargs)
|
|
return
|
|
|
|
raise errors.PluginModuleError(name=module.__name__)
|
|
|
|
def add_plugin(self, plugin, override=False):
|
|
"""
|
|
Add the plugin ``plugin``.
|
|
|
|
:param plugin: A subclass of `Plugin` to attempt to add.
|
|
:param override: If true, override an already added plugin.
|
|
"""
|
|
if not callable(plugin):
|
|
raise TypeError('plugin must be callable; got %r' % plugin)
|
|
|
|
# Find the base class or raise SubclassError:
|
|
for base in plugin.bases:
|
|
if issubclass(base, self.bases):
|
|
break
|
|
else:
|
|
raise errors.PluginSubclassError(
|
|
plugin=plugin,
|
|
bases=self.bases,
|
|
)
|
|
|
|
# Check override:
|
|
prev = self.__plugins_by_key.get(plugin.full_name)
|
|
if prev:
|
|
if not override:
|
|
# Must use override=True to override:
|
|
raise errors.PluginOverrideError(
|
|
base=base.__name__,
|
|
name=plugin.name,
|
|
plugin=plugin,
|
|
)
|
|
|
|
self.__plugins.remove(prev)
|
|
self.__next[plugin] = prev
|
|
else:
|
|
if override:
|
|
# There was nothing already registered to override:
|
|
raise errors.PluginMissingOverrideError(
|
|
base=base.__name__,
|
|
name=plugin.name,
|
|
plugin=plugin,
|
|
)
|
|
|
|
# The plugin is okay, add to sub_d:
|
|
self.__plugins.add(plugin)
|
|
self.__plugins_by_key[plugin.full_name] = plugin
|
|
|
|
def finalize(self):
|
|
"""
|
|
Finalize the registration, instantiate the plugins.
|
|
|
|
`API.bootstrap` will automatically be called if it hasn't been
|
|
already.
|
|
"""
|
|
self.__doing('finalize')
|
|
self.__do_if_not_done('load_plugins')
|
|
|
|
for plugin in self.__plugins:
|
|
if not self.env.validate_api:
|
|
if plugin.full_name not in DEFAULT_PLUGINS:
|
|
continue
|
|
else:
|
|
try:
|
|
default_version = self.__default_map[plugin.name]
|
|
except KeyError:
|
|
pass
|
|
else:
|
|
version = LooseVersion(plugin.version)
|
|
default_version = LooseVersion(default_version)
|
|
if version < default_version:
|
|
continue
|
|
self.__default_map[plugin.name] = plugin.version
|
|
|
|
production_mode = self.is_production_mode()
|
|
|
|
for base in self.bases:
|
|
for plugin in self.__plugins:
|
|
if not any(issubclass(b, base) for b in plugin.bases):
|
|
continue
|
|
if not self.env.plugins_on_demand:
|
|
self._get(plugin)
|
|
|
|
name = base.__name__
|
|
if not production_mode:
|
|
assert not hasattr(self, name)
|
|
setattr(self, name, APINameSpace(self, base))
|
|
|
|
for instance in six.itervalues(self.__instances):
|
|
if not production_mode:
|
|
assert instance.api is self
|
|
if not self.env.plugins_on_demand:
|
|
instance.ensure_finalized()
|
|
if not production_mode:
|
|
assert islocked(instance)
|
|
|
|
self.__finalized = True
|
|
|
|
if not production_mode:
|
|
lock(self)
|
|
|
|
def _get(self, plugin):
|
|
if not callable(plugin):
|
|
raise TypeError('plugin must be callable; got %r' % plugin)
|
|
if plugin not in self.__plugins:
|
|
raise KeyError(plugin)
|
|
|
|
try:
|
|
instance = self.__instances[plugin]
|
|
except KeyError:
|
|
instance = self.__instances[plugin] = plugin(self)
|
|
|
|
return instance
|
|
|
|
def get_plugin_next(self, plugin):
|
|
if not callable(plugin):
|
|
raise TypeError('plugin must be callable; got %r' % plugin)
|
|
|
|
return self.__next[plugin]
|
|
|
|
|
|
class IPAHelpFormatter(optparse.IndentedHelpFormatter):
|
|
def format_epilog(self, text):
|
|
text_width = self.width - self.current_indent
|
|
indent = " " * self.current_indent
|
|
lines = text.splitlines()
|
|
result = '\n'.join(
|
|
textwrap.fill(line, text_width, initial_indent=indent,
|
|
subsequent_indent=indent)
|
|
for line in lines)
|
|
return '\n%s\n' % result
|