Source Code for Module rosmaster.util

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34   
35  """ 
36  Utility routines for rosmaster. 
37  """ 
38   
39  try: 
40      from urllib.parse import urlparse 
41  except ImportError: 
42      from urlparse import urlparse 
43  try: 
44      from xmlrpc.client import ServerProxy 
45  except ImportError: 
46      from xmlrpclib import ServerProxy 
47   
48  from defusedxml.xmlrpc import monkey_patch 
49  monkey_patch() 
50  del monkey_patch 
51   
52  import errno 
53  import socket 
54   
55  _proxies = {} #cache ServerProxys 
56 -def xmlrpcapi(uri): 
57      """ 
58      @return: instance for calling remote server or None if not a valid URI 
59      @rtype: xmlrpc.client.ServerProxy 
60      """ 
61      if uri is None: 
62          return None 
63      uriValidate = urlparse(uri) 
64      if not uriValidate[0] or not uriValidate[1]: 
65          return None 
66      if not uri in _proxies: 
67          _proxies[uri] = ServerProxy(uri) 
68      close_half_closed_sockets() 
69      return _proxies[uri] 
70   
71   
72 -def close_half_closed_sockets(): 
73      if not hasattr(socket, 'TCP_INFO'): 
74          return 
75      for proxy in _proxies.values(): 
76          transport = proxy("transport") 
77          if transport._connection and transport._connection[1] is not None and transport._connection[1].sock is not None: 
78              try: 
79                  state = transport._connection[1].sock.getsockopt(socket.SOL_TCP, socket.TCP_INFO) 
80              except socket.error as e: # catch [Errno 92] Protocol not available 
81                  if e.args[0] is errno.ENOPROTOOPT: 
82                      return 
83                  raise 
84              if state == 8:  # CLOSE_WAIT 
85                  transport.close() 
86   
87   
88 -def remove_server_proxy(uri): 
89      if uri in _proxies: 
90          del _proxies[uri] 
91