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123 lines
3.9 KiB
Python
123 lines
3.9 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
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# modify it under the terms of the GNU General Public License as
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# published by the Free Software Foundation; version 2 only
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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, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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"""
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Base classes for all backed-end plugins.
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"""
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import threading
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import plugable
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from errors2 import PublicError, InternalError, CommandError
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from request import context, Connection, destroy_context
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class Backend(plugable.Plugin):
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"""
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Base class for all backend plugins.
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"""
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__proxy__ = False # Backend plugins are not wrapped in a PluginProxy
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class Connectible(Backend):
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"""
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Base class for backend plugins that create connections.
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In addition to the nicety of providing a standard connection API, all
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backend plugins that create connections should use this base class so that
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`request.destroy_context()` can properly close all open connections.
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"""
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def connect(self, *args, **kw):
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"""
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Create thread-local connection.
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"""
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if hasattr(context, self.name):
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raise StandardError(
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"connect: 'context.%s' already exists in thread %r" % (
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self.name, threading.currentThread().getName()
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)
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)
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conn = self.create_connection(*args, **kw)
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setattr(context, self.name, Connection(conn, self.disconnect))
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assert self.conn is conn
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self.info('Created connection context.%s' % self.name)
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def create_connection(self, *args, **kw):
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raise NotImplementedError('%s.create_connection()' % self.name)
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def disconnect(self):
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if not hasattr(context, self.name):
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raise StandardError(
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"disconnect: 'context.%s' does not exist in thread %r" % (
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self.name, threading.currentThread().getName()
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)
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)
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self.destroy_connection()
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self.info('Destroyed connection context.%s' % self.name)
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def destroy_connection(self):
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raise NotImplementedError('%s.destroy_connection()' % self.name)
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def isconnected(self):
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"""
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Return ``True`` if thread-local connection on `request.context` exists.
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"""
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return hasattr(context, self.name)
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def __get_conn(self):
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"""
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Return thread-local connection.
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"""
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if not hasattr(context, self.name):
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raise AttributeError('no context.%s in thread %r' % (
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self.name, threading.currentThread().getName())
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)
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return getattr(context, self.name).conn
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conn = property(__get_conn)
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class Executioner(Backend):
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def create_context(self, ccache=None, client_ip=None):
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if self.env.in_server:
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self.Backend.ldap.connect(ccache)
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else:
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self.Backend.xmlclient.connect()
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def execute(self, _name, *args, **options):
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error = None
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try:
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if _name not in self.Command:
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raise CommandError(name=_name)
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result = self.Command[_name](*args, **options)
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except PublicError, e:
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error = e
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except StandardError, e:
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self.exception(
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'non-public: %s: %s', e.__class__.__name__, str(e)
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)
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error = InternalError()
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destroy_context()
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if error is None:
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return result
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assert isinstance(error, PublicError)
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raise error
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