Merge branch 'stable-2.16' into stable-2.17
[ganeti-github.git] / lib / wconfd.py
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 # R0904: Too many public methods
47 # pylint: disable=R0904
48 """High-level WConfD client implementation.
49
50 This uses a backing Transport-like class on top of which it
51 implements data serialization/deserialization.
52
53 """
54 def __init__(self, timeouts=None, transport=Transport, allow_non_master=None):
55 """Constructor for the Client class.
56
57 Arguments are the same as for L{AbstractClient}.
58
59 """
60 cl.AbstractStubClient.__init__(self,
61 timeouts=timeouts,
62 transport=transport,
63 allow_non_master=allow_non_master)
64 stub.ClientRpcStub.__init__(self)
65
66 retries = 12
67 for try_no in range(0, retries):
68 try:
69 self._InitTransport()
70 return
71 except errors.TimeoutError:
72 logging.debug("Timout trying to connect to WConfD")
73 if try_no == retries -1:
74 raise
75 logging.debug("Will retry")
76 time.sleep(try_no * 10 + 10 * random.random())