sfa/util/xmlrpcprotocol.py

   1 # XMLRPC-specific code for SFA Client
   2
   3 import xmlrpclib
   4
   5 from sfa.util.sfalogging import sfa_logger
   6
   7 ##
   8 # ServerException, ExceptionUnmarshaller
   9 #
  10 # Used to convert server exception strings back to an exception.
  11 #    from usenet, Raghuram Devarakonda
  12
  13 class ServerException(Exception):
  14     pass
  15
  16 class ExceptionUnmarshaller(xmlrpclib.Unmarshaller):
  17     def close(self):
  18         try:
  19             return xmlrpclib.Unmarshaller.close(self)
  20         except xmlrpclib.Fault, e:
  21             raise ServerException(e.faultString)
  22
  23 ##
  24 # XMLRPCTransport
  25 #
  26 # A transport for XMLRPC that works on top of HTTPS
  27
  28 class XMLRPCTransport(xmlrpclib.Transport):
  29     key_file = None
  30     cert_file = None
  31     def make_connection(self, host):
  32         # create a HTTPS connection object from a host descriptor
  33         # host may be a string, or a (host, x509-dict) tuple
  34         import httplib
  35         host, extra_headers, x509 = self.get_host_info(host)
  36         try:
  37             HTTPS = httplib.HTTPS()
  38 # xxx sfa-1.0-10-broken - non-working attempt for python-2.7
  39 #            HTTPS = httplib.HTTPSConnection(host, None)
  40         except AttributeError:
  41             raise NotImplementedError(
  42                 "your version of httplib doesn't support HTTPS"
  43                 )
  44         else:
  45             return httplib.HTTPS(host, None, key_file=self.key_file, cert_file=self.cert_file) #**(x509 or {}))
  46 # xxx sfa-1.0-10-broken - non-working attempt for python-2.7
  47 #            return httplib.HTTPSConnection(host, None, key_file=self.key_file, cert_file=self.cert_file) #**(x509 or {}))
  48
  49     def getparser(self):
  50         unmarshaller = ExceptionUnmarshaller()
  51         parser = xmlrpclib.ExpatParser(unmarshaller)
  52         return parser, unmarshaller
  53
  54 class XMLRPCServerProxy(xmlrpclib.ServerProxy):
  55     def __init__(self, url, transport, allow_none=True, options=None):
  56         verbose = False
  57         if options and options.debug:
  58             verbose = True
  59         sfa_logger().info ("Connecting to xmlrpcserver at %s (with verbose=%s)"%(url,verbose))
  60         xmlrpclib.ServerProxy.__init__(self, url, transport, allow_none=allow_none, verbose=verbose)
  61
  62     def __getattr__(self, attr):
  63         sfa_logger().info ("Calling xml-rpc method:%s"%attr)
  64         return xmlrpclib.ServerProxy.__getattr__(self, attr)
  65
  66
  67 def get_server(url, key_file, cert_file, options=None):
  68     transport = XMLRPCTransport()
  69     transport.key_file = key_file
  70     transport.cert_file = cert_file
  71
  72     return XMLRPCServerProxy(url, transport, allow_none=True, options=options)
  73