Localize XenAPI.py
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John Hua
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#============================================================================
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of version 2.1 of the GNU Lesser General Public
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# License as published by the Free Software Foundation.
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#
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# This library 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 GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with this library; 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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# Copyright (C) 2006-2007 XenSource Inc.
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#============================================================================
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#
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# Parts of this file are based upon xmlrpclib.py, the XML-RPC client
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# interface included in the Python distribution.
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#
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# Copyright (c) 1999-2002 by Secret Labs AB
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# Copyright (c) 1999-2002 by Fredrik Lundh
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#
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# By obtaining, using, and/or copying this software and/or its
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# associated documentation, you agree that you have read, understood,
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# and will comply with the following terms and conditions:
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#
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# Permission to use, copy, modify, and distribute this software and
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# its associated documentation for any purpose and without fee is
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# hereby granted, provided that the above copyright notice appears in
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# all copies, and that both that copyright notice and this permission
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# notice appear in supporting documentation, and that the name of
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# Secret Labs AB or the author not be used in advertising or publicity
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# pertaining to distribution of the software without specific, written
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# prior permission.
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#
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# SECRET LABS AB AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD
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# TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANT-
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# ABILITY AND FITNESS. IN NO EVENT SHALL SECRET LABS AB OR THE AUTHOR
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# BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY
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# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
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# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
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# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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# OF THIS SOFTWARE.
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# --------------------------------------------------------------------
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import gettext
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import xmlrpclib
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import httplib
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import socket
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translation = gettext.translation('xen-xm', fallback = True)
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API_VERSION_1_1 = '1.1'
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API_VERSION_1_2 = '1.2'
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class Failure(Exception):
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def __init__(self, details):
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self.details = details
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def __str__(self):
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try:
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return str(self.details)
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except Exception, exn:
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import sys
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print >>sys.stderr, exn
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return "Xen-API failure: %s" % str(self.details)
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def _details_map(self):
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return dict([(str(i), self.details[i])
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for i in range(len(self.details))])
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_RECONNECT_AND_RETRY = (lambda _ : ())
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class UDSHTTPConnection(httplib.HTTPConnection):
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"""HTTPConnection subclass to allow HTTP over Unix domain sockets. """
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def connect(self):
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path = self.host.replace("_", "/")
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self.sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
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self.sock.connect(path)
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class UDSHTTP(httplib.HTTP):
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_connection_class = UDSHTTPConnection
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class UDSTransport(xmlrpclib.Transport):
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def __init__(self, use_datetime=0):
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self._use_datetime = use_datetime
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self._extra_headers=[]
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def add_extra_header(self, key, value):
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self._extra_headers += [ (key,value) ]
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def make_connection(self, host):
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return UDSHTTP(host)
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def send_request(self, connection, handler, request_body):
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connection.putrequest("POST", handler)
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for key, value in self._extra_headers:
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connection.putheader(key, value)
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class Session(xmlrpclib.ServerProxy):
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"""A server proxy and session manager for communicating with xapi using
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the Xen-API.
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Example:
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session = Session('http://localhost/')
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session.login_with_password('me', 'mypassword')
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session.xenapi.VM.start(vm_uuid)
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session.xenapi.session.logout()
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"""
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def __init__(self, uri, transport=None, encoding=None, verbose=0,
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allow_none=1):
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xmlrpclib.ServerProxy.__init__(self, uri, transport, encoding,
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verbose, allow_none)
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self.transport = transport
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self._session = None
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self.last_login_method = None
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self.last_login_params = None
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self.API_version = API_VERSION_1_1
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def xenapi_request(self, methodname, params):
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if methodname.startswith('login'):
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self._login(methodname, params)
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return None
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elif methodname == 'logout' or methodname == 'session.logout':
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self._logout()
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return None
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else:
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retry_count = 0
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while retry_count < 3:
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full_params = (self._session,) + params
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result = _parse_result(getattr(self, methodname)(*full_params))
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if result == _RECONNECT_AND_RETRY:
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retry_count += 1
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if self.last_login_method:
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self._login(self.last_login_method,
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self.last_login_params)
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else:
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raise xmlrpclib.Fault(401, 'You must log in')
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else:
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return result
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raise xmlrpclib.Fault(
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500, 'Tried 3 times to get a valid session, but failed')
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def _login(self, method, params):
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result = _parse_result(getattr(self, 'session.%s' % method)(*params))
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if result == _RECONNECT_AND_RETRY:
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raise xmlrpclib.Fault(
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500, 'Received SESSION_INVALID when logging in')
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self._session = result
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self.last_login_method = method
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self.last_login_params = params
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self.API_version = self._get_api_version()
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def _logout(self):
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try:
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if self.last_login_method.startswith("slave_local"):
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return _parse_result(self.session.local_logout(self._session))
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else:
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return _parse_result(self.session.logout(self._session))
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finally:
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self._session = None
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self.last_login_method = None
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self.last_login_params = None
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self.API_version = API_VERSION_1_1
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def _get_api_version(self):
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pool = self.xenapi.pool.get_all()[0]
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host = self.xenapi.pool.get_master(pool)
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major = self.xenapi.host.get_API_version_major(host)
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minor = self.xenapi.host.get_API_version_minor(host)
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return "%s.%s"%(major,minor)
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def __getattr__(self, name):
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if name == 'handle':
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return self._session
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elif name == 'xenapi':
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return _Dispatcher(self.API_version, self.xenapi_request, None)
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elif name.startswith('login') or name.startswith('slave_local'):
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return lambda *params: self._login(name, params)
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else:
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return xmlrpclib.ServerProxy.__getattr__(self, name)
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def xapi_local():
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return Session("http://_var_xapi_xapi/", transport=UDSTransport())
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def _parse_result(result):
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if type(result) != dict or 'Status' not in result:
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raise xmlrpclib.Fault(500, 'Missing Status in response from server' + result)
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if result['Status'] == 'Success':
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if 'Value' in result:
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return result['Value']
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else:
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raise xmlrpclib.Fault(500,
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'Missing Value in response from server')
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else:
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if 'ErrorDescription' in result:
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if result['ErrorDescription'][0] == 'SESSION_INVALID':
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return _RECONNECT_AND_RETRY
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else:
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raise Failure(result['ErrorDescription'])
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else:
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raise xmlrpclib.Fault(
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500, 'Missing ErrorDescription in response from server')
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# Based upon _Method from xmlrpclib.
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class _Dispatcher:
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def __init__(self, API_version, send, name):
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self.__API_version = API_version
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self.__send = send
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self.__name = name
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def __repr__(self):
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if self.__name:
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return '<XenAPI._Dispatcher for %s>' % self.__name
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else:
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return '<XenAPI._Dispatcher>'
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def __getattr__(self, name):
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if self.__name is None:
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return _Dispatcher(self.__API_version, self.__send, name)
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else:
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return _Dispatcher(self.__API_version, self.__send, "%s.%s" % (self.__name, name))
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def __call__(self, *args):
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return self.__send(self.__name, args)
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