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XenAPI.py
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#============================================================================
# This library is free software; you can redistribute it and/or
# modify it under the terms of version 2.1 of the GNU Lesser General Public
# License as published by the Free Software Foundation.
#
# This library 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#============================================================================
# Copyright (C) 2006 XenSource Inc.
#============================================================================
#
# Parts of this file are based upon xmlrpclib.py, the XML-RPC client
# interface included in the Python distribution.
#
# Copyright (c) 1999-2002 by Secret Labs AB
# Copyright (c) 1999-2002 by Fredrik Lundh
#
# By obtaining, using, and/or copying this software and/or its
# associated documentation, you agree that you have read, understood,
# and will comply with the following terms and conditions:
#
# Permission to use, copy, modify, and distribute this software and
# its associated documentation for any purpose and without fee is
# hereby granted, provided that the above copyright notice appears in
# all copies, and that both that copyright notice and this permission
# notice appear in supporting documentation, and that the name of
# Secret Labs AB or the author not be used in advertising or publicity
# pertaining to distribution of the software without specific, written
# prior permission.
#
# SECRET LABS AB AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD
# TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANT-
# ABILITY AND FITNESS. IN NO EVENT SHALL SECRET LABS AB OR THE AUTHOR
# BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY
# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
# OF THIS SOFTWARE.
# --------------------------------------------------------------------
import gettext
import xmlrpclib
import httplib
import socket
translation = gettext.translation('xen-xm', fallback = True)
class Failure(Exception):
def __init__(self, details):
try:
# If this failure is MESSAGE_PARAMETER_COUNT_MISMATCH, then we
# correct the return values here, to account for the fact that we
# transparently add the session handle as the first argument.
if details[0] == 'MESSAGE_PARAMETER_COUNT_MISMATCH':
details[2] = str(int(details[2]) - 1)
details[3] = str(int(details[3]) - 1)
self.details = details
except Exception, exn:
self.details = ['INTERNAL_ERROR', 'Client-side: ' + str(exn)]
def __str__(self):
try:
return translation.ugettext(self.details[0]) % self._details_map()
except TypeError, exn:
return "Message database broken: %s.\nXen-API failure: %s" % \
(exn, str(self.details))
except Exception, exn:
import sys
print >>sys.stderr, exn
return "Xen-API failure: %s" % str(self.details)
def _details_map(self):
return dict([(str(i), self.details[i])
for i in range(len(self.details))])
_RECONNECT_AND_RETRY = (lambda _ : ())
class UDSHTTPConnection(httplib.HTTPConnection):
""" Stupid hacked up HTTPConnection subclass to allow HTTP over Unix domain
sockets. """
def connect(self):
path = self.host.replace("_", "/")
self.sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
self.sock.connect(path)
class UDSHTTP(httplib.HTTP):
_connection_class = UDSHTTPConnection
class UDSTransport(xmlrpclib.Transport):
def make_connection(self, host):
return UDSHTTP(host)
class Session(xmlrpclib.ServerProxy):
"""A server proxy and session manager for communicating with Xend using
the Xen-API.
Example:
session = Session('http://localhost:9363/')
session.login_with_password('me', 'mypassword')
session.xenapi.VM.start(vm_uuid)
session.xenapi.session.logout()
For now, this class also supports the legacy XML-RPC API, using
session.xend.domain('Domain-0') and similar. This support will disappear
once there is a working Xen-API replacement for every call in the legacy
API.
"""
def __init__(self, uri, transport=None, encoding=None, verbose=0,
allow_none=1):
xmlrpclib.ServerProxy.__init__(self, uri, transport, encoding,
verbose, allow_none)
self._session = None
self.last_login_method = None
self.last_login_params = None
def xenapi_request(self, methodname, params):
if methodname.startswith('login'):
self._login(methodname, params)
return None
else:
retry_count = 0
while retry_count < 3:
full_params = (self._session,) + params
result = _parse_result(getattr(self, methodname)(*full_params))
if result == _RECONNECT_AND_RETRY:
retry_count += 1
if self.last_login_method:
self._login(self.last_login_method,
self.last_login_params)
else:
raise xmlrpclib.Fault(401, 'You must log in')
else:
return result
raise xmlrpclib.Fault(
500, 'Tried 3 times to get a valid session, but failed')
def _login(self, method, params):
result = _parse_result(getattr(self, 'session.%s' % method)(*params))
if result == _RECONNECT_AND_RETRY:
raise xmlrpclib.Fault(
500, 'Received SESSION_INVALID when logging in')
self._session = result
self.last_login_method = method
self.last_login_params = params
def __getattr__(self, name):
if name == 'xenapi':
return _Dispatcher(self.xenapi_request, None)
elif name.startswith('login'):
return lambda *params: self._login(name, params)
else:
return xmlrpclib.ServerProxy.__getattr__(self, name)
def xapi_local():
return Session("http://_var_xapi_xapi/", transport=UDSTransport())
def _parse_result(result):
if type(result) != dict or 'Status' not in result:
raise xmlrpclib.Fault(500, 'Missing Status in response from server' + result)
if result['Status'] == 'Success':
if 'Value' in result:
return result['Value']
else:
raise xmlrpclib.Fault(500,
'Missing Value in response from server')
else:
if 'ErrorDescription' in result:
if result['ErrorDescription'][0] == 'SESSION_INVALID':
return _RECONNECT_AND_RETRY
else:
raise Failure(result['ErrorDescription'])
else:
raise xmlrpclib.Fault(
500, 'Missing ErrorDescription in response from server')
# Based upon _Method from xmlrpclib.
class _Dispatcher:
def __init__(self, send, name):
self.__send = send
self.__name = name
def __repr__(self):
if self.__name:
return '<XenAPI._Dispatcher for %s>' % self.__name
else:
return '<XenAPI._Dispatcher>'
def __getattr__(self, name):
if self.__name is None:
return _Dispatcher(self.__send, name)
else:
return _Dispatcher(self.__send, "%s.%s" % (self.__name, name))
def __call__(self, *args):
return self.__send(self.__name, args)