Source Code for Module ganeti.wconfd

 1  # 
 2  # 
 3   
 4  # Copyright (C) 2014 Google Inc. 
 5  # All rights reserved. 
 6  # 
 7  # Redistribution and use in source and binary forms, with or without 
 8  # modification, are permitted provided that the following conditions are 
 9  # met: 
10  # 
11  # 1. Redistributions of source code must retain the above copyright notice, 
12  # this list of conditions and the following disclaimer. 
13  # 
14  # 2. Redistributions in binary form must reproduce the above copyright 
15  # notice, this list of conditions and the following disclaimer in the 
16  # documentation and/or other materials provided with the distribution. 
17  # 
18  # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS 
19  # IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 
20  # TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 
21  # PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR 
22  # CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 
23  # EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 
24  # PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 
25  # PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 
26  # LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 
27  # NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 
28  # SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
29   
30   
31  """Module for the WConfd protocol 
32   
33  """ 
34   
35  import logging 
36  import random 
37  import time 
38   
39  import ganeti.rpc.client as cl 
40  import ganeti.rpc.stub.wconfd as stub 
41  from ganeti.rpc.transport import Transport 
42  from ganeti.rpc import errors 
43   
44   
45 -class Client(cl.AbstractStubClient, stub.ClientRpcStub): 
46    """High-level WConfD client implementation. 
47   
48    This uses a backing Transport-like class on top of which it 
49    implements data serialization/deserialization. 
50   
51    """ 
52 -  def __init__(self, timeouts=None, transport=Transport, allow_non_master=None): 
53      """Constructor for the Client class. 
54   
55      Arguments are the same as for L{AbstractClient}. 
56   
57      """ 
58      cl.AbstractStubClient.__init__(self, 
59                                     timeouts=timeouts, 
60                                     transport=transport, 
61                                     allow_non_master=allow_non_master) 
62      stub.ClientRpcStub.__init__(self) 
63   
64      retries = 12 
65      for try_no in range(0, retries): 
66        try: 
67          self._InitTransport() 
68          return 
69        except errors.TimeoutError: 
70          logging.debug("Timout trying to connect to WConfD") 
71          if try_no == retries -1: 
72            raise 
73          logging.debug("Will retry") 
74          time.sleep(try_no * 10 + 10 * random.random()) 
75