root / lib / confd / client.py @ 5b349fd1
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1 | e4ccf6cd | Guido Trotter | #
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2 | e4ccf6cd | Guido Trotter | #
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3 | e4ccf6cd | Guido Trotter | |
4 | e4ccf6cd | Guido Trotter | # Copyright (C) 2009 Google Inc.
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5 | e4ccf6cd | Guido Trotter | #
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6 | e4ccf6cd | Guido Trotter | # This program is free software; you can redistribute it and/or modify
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7 | e4ccf6cd | Guido Trotter | # it under the terms of the GNU General Public License as published by
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8 | e4ccf6cd | Guido Trotter | # the Free Software Foundation; either version 2 of the License, or
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9 | e4ccf6cd | Guido Trotter | # (at your option) any later version.
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10 | e4ccf6cd | Guido Trotter | #
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11 | e4ccf6cd | Guido Trotter | # This program is distributed in the hope that it will be useful, but
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12 | e4ccf6cd | Guido Trotter | # WITHOUT ANY WARRANTY; without even the implied warranty of
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13 | e4ccf6cd | Guido Trotter | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 | e4ccf6cd | Guido Trotter | # General Public License for more details.
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15 | e4ccf6cd | Guido Trotter | #
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16 | e4ccf6cd | Guido Trotter | # You should have received a copy of the GNU General Public License
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17 | e4ccf6cd | Guido Trotter | # along with this program; if not, write to the Free Software
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18 | e4ccf6cd | Guido Trotter | # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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19 | e4ccf6cd | Guido Trotter | # 02110-1301, USA.
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20 | e4ccf6cd | Guido Trotter | |
21 | e4ccf6cd | Guido Trotter | |
22 | e4ccf6cd | Guido Trotter | """Ganeti confd client
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23 | e4ccf6cd | Guido Trotter |
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24 | cf7b0cc4 | Guido Trotter | Clients can use the confd client library to send requests to a group of master
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25 | cf7b0cc4 | Guido Trotter | candidates running confd. The expected usage is through the asyncore framework,
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26 | cf7b0cc4 | Guido Trotter | by sending queries, and asynchronously receiving replies through a callback.
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27 | cf7b0cc4 | Guido Trotter |
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28 | cf7b0cc4 | Guido Trotter | This way the client library doesn't ever need to "wait" on a particular answer,
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29 | cf7b0cc4 | Guido Trotter | and can proceed even if some udp packets are lost. It's up to the user to
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30 | cf7b0cc4 | Guido Trotter | reschedule queries if they haven't received responses and they need them.
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31 | cf7b0cc4 | Guido Trotter |
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32 | 69b99987 | Michael Hanselmann | Example usage::
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33 | 69b99987 | Michael Hanselmann |
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34 | cf7b0cc4 | Guido Trotter | client = ConfdClient(...) # includes callback specification
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35 | cf7b0cc4 | Guido Trotter | req = confd_client.ConfdClientRequest(type=constants.CONFD_REQ_PING)
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36 | cf7b0cc4 | Guido Trotter | client.SendRequest(req)
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37 | cf7b0cc4 | Guido Trotter | # then make sure your client calls asyncore.loop() or daemon.Mainloop.Run()
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38 | cf7b0cc4 | Guido Trotter | # ... wait ...
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39 | cf7b0cc4 | Guido Trotter | # And your callback will be called by asyncore, when your query gets a
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40 | cf7b0cc4 | Guido Trotter | # response, or when it expires.
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41 | cf7b0cc4 | Guido Trotter |
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42 | 392ca296 | Guido Trotter | You can use the provided ConfdFilterCallback to act as a filter, only passing
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43 | 392ca296 | Guido Trotter | "newer" answer to your callback, and filtering out outdated ones, or ones
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44 | 392ca296 | Guido Trotter | confirming what you already got.
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45 | 392ca296 | Guido Trotter |
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46 | e4ccf6cd | Guido Trotter | """
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47 | 69b99987 | Michael Hanselmann | |
48 | 6c881c52 | Iustin Pop | # pylint: disable-msg=E0203
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49 | 6c881c52 | Iustin Pop | |
50 | 6c881c52 | Iustin Pop | # E0203: Access to member %r before its definition, since we use
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51 | 6c881c52 | Iustin Pop | # objects.py which doesn't explicitely initialise its members
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52 | 6c881c52 | Iustin Pop | |
53 | e4ccf6cd | Guido Trotter | import time |
54 | e4ccf6cd | Guido Trotter | import random |
55 | e4ccf6cd | Guido Trotter | |
56 | e4ccf6cd | Guido Trotter | from ganeti import utils |
57 | e4ccf6cd | Guido Trotter | from ganeti import constants |
58 | e4ccf6cd | Guido Trotter | from ganeti import objects |
59 | e4ccf6cd | Guido Trotter | from ganeti import serializer |
60 | e4ccf6cd | Guido Trotter | from ganeti import daemon # contains AsyncUDPSocket |
61 | e4ccf6cd | Guido Trotter | from ganeti import errors |
62 | e4ccf6cd | Guido Trotter | from ganeti import confd |
63 | 5b349fd1 | Iustin Pop | from ganeti import ssconf |
64 | e4ccf6cd | Guido Trotter | |
65 | e4ccf6cd | Guido Trotter | |
66 | e4ccf6cd | Guido Trotter | class ConfdAsyncUDPClient(daemon.AsyncUDPSocket): |
67 | e4ccf6cd | Guido Trotter | """Confd udp asyncore client
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68 | e4ccf6cd | Guido Trotter |
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69 | e4ccf6cd | Guido Trotter | This is kept separate from the main ConfdClient to make sure it's easy to
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70 | e4ccf6cd | Guido Trotter | implement a non-asyncore based client library.
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71 | e4ccf6cd | Guido Trotter |
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72 | e4ccf6cd | Guido Trotter | """
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73 | e4ccf6cd | Guido Trotter | def __init__(self, client): |
74 | e4ccf6cd | Guido Trotter | """Constructor for ConfdAsyncUDPClient
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75 | e4ccf6cd | Guido Trotter |
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76 | e4ccf6cd | Guido Trotter | @type client: L{ConfdClient}
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77 | e4ccf6cd | Guido Trotter | @param client: client library, to pass the datagrams to
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78 | e4ccf6cd | Guido Trotter |
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79 | e4ccf6cd | Guido Trotter | """
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80 | e4ccf6cd | Guido Trotter | daemon.AsyncUDPSocket.__init__(self)
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81 | e4ccf6cd | Guido Trotter | self.client = client
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82 | e4ccf6cd | Guido Trotter | |
83 | e4ccf6cd | Guido Trotter | # this method is overriding a daemon.AsyncUDPSocket method
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84 | e4ccf6cd | Guido Trotter | def handle_datagram(self, payload, ip, port): |
85 | e4ccf6cd | Guido Trotter | self.client.HandleResponse(payload, ip, port)
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86 | e4ccf6cd | Guido Trotter | |
87 | e4ccf6cd | Guido Trotter | |
88 | e4ccf6cd | Guido Trotter | class ConfdClient: |
89 | e4ccf6cd | Guido Trotter | """Send queries to confd, and get back answers.
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90 | e4ccf6cd | Guido Trotter |
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91 | e4ccf6cd | Guido Trotter | Since the confd model works by querying multiple master candidates, and
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92 | e4ccf6cd | Guido Trotter | getting back answers, this is an asynchronous library. It can either work
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93 | e4ccf6cd | Guido Trotter | through asyncore or with your own handling.
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94 | e4ccf6cd | Guido Trotter |
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95 | e4ccf6cd | Guido Trotter | """
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96 | a3db74e4 | Guido Trotter | def __init__(self, hmac_key, peers, callback, port=None, logger=None): |
97 | e4ccf6cd | Guido Trotter | """Constructor for ConfdClient
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98 | e4ccf6cd | Guido Trotter |
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99 | e4ccf6cd | Guido Trotter | @type hmac_key: string
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100 | e4ccf6cd | Guido Trotter | @param hmac_key: hmac key to talk to confd
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101 | e4ccf6cd | Guido Trotter | @type peers: list
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102 | e4ccf6cd | Guido Trotter | @param peers: list of peer nodes
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103 | 96e03b0b | Guido Trotter | @type callback: f(L{ConfdUpcallPayload})
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104 | 96e03b0b | Guido Trotter | @param callback: function to call when getting answers
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105 | 7d20c647 | Guido Trotter | @type port: integer
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106 | d63997b3 | Guido Trotter | @param port: confd port (default: use GetDaemonPort)
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107 | 69b99987 | Michael Hanselmann | @type logger: logging.Logger
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108 | d63997b3 | Guido Trotter | @param logger: optional logger for internal conditions
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109 | e4ccf6cd | Guido Trotter |
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110 | e4ccf6cd | Guido Trotter | """
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111 | 96e03b0b | Guido Trotter | if not callable(callback): |
112 | 96e03b0b | Guido Trotter | raise errors.ProgrammerError("callback must be callable") |
113 | e4ccf6cd | Guido Trotter | |
114 | a5229439 | Guido Trotter | self.UpdatePeerList(peers)
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115 | e4ccf6cd | Guido Trotter | self._hmac_key = hmac_key
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116 | e4ccf6cd | Guido Trotter | self._socket = ConfdAsyncUDPClient(self) |
117 | 96e03b0b | Guido Trotter | self._callback = callback
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118 | 7d20c647 | Guido Trotter | self._confd_port = port
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119 | a3db74e4 | Guido Trotter | self._logger = logger
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120 | 96e03b0b | Guido Trotter | self._requests = {}
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121 | 96e03b0b | Guido Trotter | self._expire_requests = []
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122 | 7d20c647 | Guido Trotter | |
123 | 7d20c647 | Guido Trotter | if self._confd_port is None: |
124 | 7d20c647 | Guido Trotter | self._confd_port = utils.GetDaemonPort(constants.CONFD)
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125 | e4ccf6cd | Guido Trotter | |
126 | a5229439 | Guido Trotter | def UpdatePeerList(self, peers): |
127 | a5229439 | Guido Trotter | """Update the list of peers
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128 | a5229439 | Guido Trotter |
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129 | a5229439 | Guido Trotter | @type peers: list
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130 | a5229439 | Guido Trotter | @param peers: list of peer nodes
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131 | a5229439 | Guido Trotter |
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132 | a5229439 | Guido Trotter | """
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133 | e11ddf13 | Iustin Pop | # we are actually called from init, so:
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134 | e11ddf13 | Iustin Pop | # pylint: disable-msg=W0201
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135 | a5229439 | Guido Trotter | if not isinstance(peers, list): |
136 | a5229439 | Guido Trotter | raise errors.ProgrammerError("peers must be a list") |
137 | db169865 | Guido Trotter | # make a copy of peers, since we're going to shuffle the list, later
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138 | db169865 | Guido Trotter | self._peers = list(peers) |
139 | a5229439 | Guido Trotter | |
140 | e4ccf6cd | Guido Trotter | def _PackRequest(self, request, now=None): |
141 | e4ccf6cd | Guido Trotter | """Prepare a request to be sent on the wire.
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142 | e4ccf6cd | Guido Trotter |
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143 | e4ccf6cd | Guido Trotter | This function puts a proper salt in a confd request, puts the proper salt,
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144 | e4ccf6cd | Guido Trotter | and adds the correct magic number.
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145 | e4ccf6cd | Guido Trotter |
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146 | e4ccf6cd | Guido Trotter | """
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147 | e4ccf6cd | Guido Trotter | if now is None: |
148 | e4ccf6cd | Guido Trotter | now = time.time() |
149 | e4ccf6cd | Guido Trotter | tstamp = '%d' % now
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150 | e4ccf6cd | Guido Trotter | req = serializer.DumpSignedJson(request.ToDict(), self._hmac_key, tstamp)
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151 | e4ccf6cd | Guido Trotter | return confd.PackMagic(req)
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152 | e4ccf6cd | Guido Trotter | |
153 | e4ccf6cd | Guido Trotter | def _UnpackReply(self, payload): |
154 | e4ccf6cd | Guido Trotter | in_payload = confd.UnpackMagic(payload) |
155 | c103d7ae | Guido Trotter | (dict_answer, salt) = serializer.LoadSignedJson(in_payload, self._hmac_key)
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156 | c103d7ae | Guido Trotter | answer = objects.ConfdReply.FromDict(dict_answer) |
157 | e4ccf6cd | Guido Trotter | return answer, salt
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158 | e4ccf6cd | Guido Trotter | |
159 | 96e03b0b | Guido Trotter | def ExpireRequests(self): |
160 | 96e03b0b | Guido Trotter | """Delete all the expired requests.
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161 | e4ccf6cd | Guido Trotter |
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162 | e4ccf6cd | Guido Trotter | """
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163 | e4ccf6cd | Guido Trotter | now = time.time() |
164 | 96e03b0b | Guido Trotter | while self._expire_requests: |
165 | 96e03b0b | Guido Trotter | expire_time, rsalt = self._expire_requests[0] |
166 | e4ccf6cd | Guido Trotter | if now >= expire_time:
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167 | 96e03b0b | Guido Trotter | self._expire_requests.pop(0) |
168 | 96e03b0b | Guido Trotter | (request, args) = self._requests[rsalt]
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169 | 96e03b0b | Guido Trotter | del self._requests[rsalt] |
170 | 96e03b0b | Guido Trotter | client_reply = ConfdUpcallPayload(salt=rsalt, |
171 | 96e03b0b | Guido Trotter | type=UPCALL_EXPIRE, |
172 | 96e03b0b | Guido Trotter | orig_request=request, |
173 | 5f6f260a | Guido Trotter | extra_args=args, |
174 | 5f6f260a | Guido Trotter | client=self,
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175 | 5f6f260a | Guido Trotter | ) |
176 | 96e03b0b | Guido Trotter | self._callback(client_reply)
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177 | e4ccf6cd | Guido Trotter | else:
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178 | e4ccf6cd | Guido Trotter | break
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179 | e4ccf6cd | Guido Trotter | |
180 | d63997b3 | Guido Trotter | def SendRequest(self, request, args=None, coverage=None, async=True): |
181 | e4ccf6cd | Guido Trotter | """Send a confd request to some MCs
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182 | e4ccf6cd | Guido Trotter |
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183 | e4ccf6cd | Guido Trotter | @type request: L{objects.ConfdRequest}
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184 | e4ccf6cd | Guido Trotter | @param request: the request to send
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185 | e4ccf6cd | Guido Trotter | @type args: tuple
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186 | d63997b3 | Guido Trotter | @param args: additional callback arguments
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187 | e4ccf6cd | Guido Trotter | @type coverage: integer
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188 | d63997b3 | Guido Trotter | @param coverage: number of remote nodes to contact
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189 | 8496d93c | Guido Trotter | @type async: boolean
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190 | 8496d93c | Guido Trotter | @param async: handle the write asynchronously
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191 | e4ccf6cd | Guido Trotter |
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192 | e4ccf6cd | Guido Trotter | """
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193 | e4ccf6cd | Guido Trotter | if coverage is None: |
194 | e4ccf6cd | Guido Trotter | coverage = min(len(self._peers), constants.CONFD_DEFAULT_REQ_COVERAGE) |
195 | e4ccf6cd | Guido Trotter | |
196 | e4ccf6cd | Guido Trotter | if coverage > len(self._peers): |
197 | e4ccf6cd | Guido Trotter | raise errors.ConfdClientError("Not enough MCs known to provide the" |
198 | e4ccf6cd | Guido Trotter | " desired coverage")
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199 | e4ccf6cd | Guido Trotter | |
200 | e4ccf6cd | Guido Trotter | if not request.rsalt: |
201 | e4ccf6cd | Guido Trotter | raise errors.ConfdClientError("Missing request rsalt") |
202 | e4ccf6cd | Guido Trotter | |
203 | 96e03b0b | Guido Trotter | self.ExpireRequests()
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204 | 96e03b0b | Guido Trotter | if request.rsalt in self._requests: |
205 | e4ccf6cd | Guido Trotter | raise errors.ConfdClientError("Duplicate request rsalt") |
206 | e4ccf6cd | Guido Trotter | |
207 | e4ccf6cd | Guido Trotter | if request.type not in constants.CONFD_REQS: |
208 | e4ccf6cd | Guido Trotter | raise errors.ConfdClientError("Invalid request type") |
209 | e4ccf6cd | Guido Trotter | |
210 | e4ccf6cd | Guido Trotter | random.shuffle(self._peers)
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211 | e4ccf6cd | Guido Trotter | targets = self._peers[:coverage]
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212 | e4ccf6cd | Guido Trotter | |
213 | e4ccf6cd | Guido Trotter | now = time.time() |
214 | e4ccf6cd | Guido Trotter | payload = self._PackRequest(request, now=now)
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215 | e4ccf6cd | Guido Trotter | |
216 | e4ccf6cd | Guido Trotter | for target in targets: |
217 | e4ccf6cd | Guido Trotter | try:
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218 | e4ccf6cd | Guido Trotter | self._socket.enqueue_send(target, self._confd_port, payload) |
219 | e4ccf6cd | Guido Trotter | except errors.UdpDataSizeError:
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220 | e4ccf6cd | Guido Trotter | raise errors.ConfdClientError("Request too big") |
221 | e4ccf6cd | Guido Trotter | |
222 | 96e03b0b | Guido Trotter | self._requests[request.rsalt] = (request, args)
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223 | e4ccf6cd | Guido Trotter | expire_time = now + constants.CONFD_CLIENT_EXPIRE_TIMEOUT |
224 | 96e03b0b | Guido Trotter | self._expire_requests.append((expire_time, request.rsalt))
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225 | e4ccf6cd | Guido Trotter | |
226 | 8496d93c | Guido Trotter | if not async: |
227 | 8496d93c | Guido Trotter | self.FlushSendQueue()
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228 | 8496d93c | Guido Trotter | |
229 | e4ccf6cd | Guido Trotter | def HandleResponse(self, payload, ip, port): |
230 | e4ccf6cd | Guido Trotter | """Asynchronous handler for a confd reply
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231 | e4ccf6cd | Guido Trotter |
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232 | e4ccf6cd | Guido Trotter | Call the relevant callback associated to the current request.
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233 | e4ccf6cd | Guido Trotter |
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234 | e4ccf6cd | Guido Trotter | """
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235 | e4ccf6cd | Guido Trotter | try:
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236 | e4ccf6cd | Guido Trotter | try:
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237 | e4ccf6cd | Guido Trotter | answer, salt = self._UnpackReply(payload)
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238 | a3db74e4 | Guido Trotter | except (errors.SignatureError, errors.ConfdMagicError), err:
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239 | a3db74e4 | Guido Trotter | if self._logger: |
240 | a3db74e4 | Guido Trotter | self._logger.debug("Discarding broken package: %s" % err) |
241 | e4ccf6cd | Guido Trotter | return
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242 | e4ccf6cd | Guido Trotter | |
243 | e4ccf6cd | Guido Trotter | try:
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244 | 96e03b0b | Guido Trotter | (request, args) = self._requests[salt]
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245 | e4ccf6cd | Guido Trotter | except KeyError: |
246 | a3db74e4 | Guido Trotter | if self._logger: |
247 | a3db74e4 | Guido Trotter | self._logger.debug("Discarding unknown (expired?) reply: %s" % err) |
248 | 96e03b0b | Guido Trotter | return
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249 | 96e03b0b | Guido Trotter | |
250 | 96e03b0b | Guido Trotter | client_reply = ConfdUpcallPayload(salt=salt, |
251 | 96e03b0b | Guido Trotter | type=UPCALL_REPLY, |
252 | 96e03b0b | Guido Trotter | server_reply=answer, |
253 | 96e03b0b | Guido Trotter | orig_request=request, |
254 | 96e03b0b | Guido Trotter | server_ip=ip, |
255 | 96e03b0b | Guido Trotter | server_port=port, |
256 | 5f6f260a | Guido Trotter | extra_args=args, |
257 | 5f6f260a | Guido Trotter | client=self,
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258 | 5f6f260a | Guido Trotter | ) |
259 | 96e03b0b | Guido Trotter | self._callback(client_reply)
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260 | e4ccf6cd | Guido Trotter | |
261 | e4ccf6cd | Guido Trotter | finally:
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262 | 96e03b0b | Guido Trotter | self.ExpireRequests()
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263 | 96e03b0b | Guido Trotter | |
264 | 8496d93c | Guido Trotter | def FlushSendQueue(self): |
265 | 8496d93c | Guido Trotter | """Send out all pending requests.
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266 | 8496d93c | Guido Trotter |
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267 | 8496d93c | Guido Trotter | Can be used for synchronous client use.
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268 | 8496d93c | Guido Trotter |
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269 | 8496d93c | Guido Trotter | """
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270 | 8496d93c | Guido Trotter | while self._socket.writable(): |
271 | 8496d93c | Guido Trotter | self._socket.handle_write()
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272 | 8496d93c | Guido Trotter | |
273 | 8496d93c | Guido Trotter | def ReceiveReply(self, timeout=1): |
274 | 8496d93c | Guido Trotter | """Receive one reply.
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275 | 8496d93c | Guido Trotter |
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276 | 8496d93c | Guido Trotter | @type timeout: float
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277 | 8496d93c | Guido Trotter | @param timeout: how long to wait for the reply
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278 | 8496d93c | Guido Trotter | @rtype: boolean
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279 | 8496d93c | Guido Trotter | @return: True if some data has been handled, False otherwise
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280 | 8496d93c | Guido Trotter |
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281 | 8496d93c | Guido Trotter | """
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282 | 8496d93c | Guido Trotter | return self._socket.process_next_packet(timeout=timeout) |
283 | 8496d93c | Guido Trotter | |
284 | 96e03b0b | Guido Trotter | |
285 | 96e03b0b | Guido Trotter | # UPCALL_REPLY: server reply upcall
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286 | 96e03b0b | Guido Trotter | # has all ConfdUpcallPayload fields populated
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287 | 96e03b0b | Guido Trotter | UPCALL_REPLY = 1
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288 | 96e03b0b | Guido Trotter | # UPCALL_EXPIRE: internal library request expire
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289 | 96e03b0b | Guido Trotter | # has only salt, type, orig_request and extra_args
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290 | 96e03b0b | Guido Trotter | UPCALL_EXPIRE = 2
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291 | 96e03b0b | Guido Trotter | CONFD_UPCALL_TYPES = frozenset([
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292 | 96e03b0b | Guido Trotter | UPCALL_REPLY, |
293 | 96e03b0b | Guido Trotter | UPCALL_EXPIRE, |
294 | 96e03b0b | Guido Trotter | ]) |
295 | 96e03b0b | Guido Trotter | |
296 | 96e03b0b | Guido Trotter | |
297 | 96e03b0b | Guido Trotter | class ConfdUpcallPayload(objects.ConfigObject): |
298 | 96e03b0b | Guido Trotter | """Callback argument for confd replies
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299 | 96e03b0b | Guido Trotter |
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300 | 96e03b0b | Guido Trotter | @type salt: string
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301 | 96e03b0b | Guido Trotter | @ivar salt: salt associated with the query
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302 | 96e03b0b | Guido Trotter | @type type: one of confd.client.CONFD_UPCALL_TYPES
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303 | 96e03b0b | Guido Trotter | @ivar type: upcall type (server reply, expired request, ...)
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304 | 96e03b0b | Guido Trotter | @type orig_request: L{objects.ConfdRequest}
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305 | 96e03b0b | Guido Trotter | @ivar orig_request: original request
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306 | 96e03b0b | Guido Trotter | @type server_reply: L{objects.ConfdReply}
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307 | 96e03b0b | Guido Trotter | @ivar server_reply: server reply
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308 | 96e03b0b | Guido Trotter | @type server_ip: string
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309 | 96e03b0b | Guido Trotter | @ivar server_ip: answering server ip address
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310 | 96e03b0b | Guido Trotter | @type server_port: int
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311 | 96e03b0b | Guido Trotter | @ivar server_port: answering server port
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312 | 96e03b0b | Guido Trotter | @type extra_args: any
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313 | 96e03b0b | Guido Trotter | @ivar extra_args: 'args' argument of the SendRequest function
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314 | 5f6f260a | Guido Trotter | @type client: L{ConfdClient}
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315 | 5f6f260a | Guido Trotter | @ivar client: current confd client instance
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316 | 96e03b0b | Guido Trotter |
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317 | 96e03b0b | Guido Trotter | """
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318 | 96e03b0b | Guido Trotter | __slots__ = [ |
319 | 96e03b0b | Guido Trotter | "salt",
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320 | 96e03b0b | Guido Trotter | "type",
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321 | 96e03b0b | Guido Trotter | "orig_request",
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322 | 96e03b0b | Guido Trotter | "server_reply",
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323 | 96e03b0b | Guido Trotter | "server_ip",
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324 | 96e03b0b | Guido Trotter | "server_port",
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325 | 96e03b0b | Guido Trotter | "extra_args",
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326 | 5f6f260a | Guido Trotter | "client",
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327 | 96e03b0b | Guido Trotter | ] |
328 | e4ccf6cd | Guido Trotter | |
329 | e4ccf6cd | Guido Trotter | |
330 | e4ccf6cd | Guido Trotter | class ConfdClientRequest(objects.ConfdRequest): |
331 | e4ccf6cd | Guido Trotter | """This is the client-side version of ConfdRequest.
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332 | e4ccf6cd | Guido Trotter |
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333 | e4ccf6cd | Guido Trotter | This version of the class helps creating requests, on the client side, by
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334 | e4ccf6cd | Guido Trotter | filling in some default values.
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335 | e4ccf6cd | Guido Trotter |
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336 | e4ccf6cd | Guido Trotter | """
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337 | e4ccf6cd | Guido Trotter | def __init__(self, **kwargs): |
338 | e4ccf6cd | Guido Trotter | objects.ConfdRequest.__init__(self, **kwargs)
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339 | e4ccf6cd | Guido Trotter | if not self.rsalt: |
340 | e4ccf6cd | Guido Trotter | self.rsalt = utils.NewUUID()
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341 | e4ccf6cd | Guido Trotter | if not self.protocol: |
342 | e4ccf6cd | Guido Trotter | self.protocol = constants.CONFD_PROTOCOL_VERSION
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343 | e4ccf6cd | Guido Trotter | if self.type not in constants.CONFD_REQS: |
344 | e4ccf6cd | Guido Trotter | raise errors.ConfdClientError("Invalid request type") |
345 | e4ccf6cd | Guido Trotter | |
346 | 392ca296 | Guido Trotter | |
347 | 392ca296 | Guido Trotter | class ConfdFilterCallback: |
348 | 392ca296 | Guido Trotter | """Callback that calls another callback, but filters duplicate results.
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349 | 392ca296 | Guido Trotter |
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350 | 392ca296 | Guido Trotter | """
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351 | 392ca296 | Guido Trotter | def __init__(self, callback, logger=None): |
352 | 392ca296 | Guido Trotter | """Constructor for ConfdFilterCallback
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353 | 392ca296 | Guido Trotter |
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354 | 392ca296 | Guido Trotter | @type callback: f(L{ConfdUpcallPayload})
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355 | 392ca296 | Guido Trotter | @param callback: function to call when getting answers
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356 | 69b99987 | Michael Hanselmann | @type logger: logging.Logger
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357 | d63997b3 | Guido Trotter | @param logger: optional logger for internal conditions
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358 | 392ca296 | Guido Trotter |
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359 | 392ca296 | Guido Trotter | """
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360 | 392ca296 | Guido Trotter | if not callable(callback): |
361 | 392ca296 | Guido Trotter | raise errors.ProgrammerError("callback must be callable") |
362 | 392ca296 | Guido Trotter | |
363 | 392ca296 | Guido Trotter | self._callback = callback
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364 | 392ca296 | Guido Trotter | self._logger = logger
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365 | 392ca296 | Guido Trotter | # answers contains a dict of salt -> answer
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366 | 392ca296 | Guido Trotter | self._answers = {}
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367 | 392ca296 | Guido Trotter | |
368 | 392ca296 | Guido Trotter | def _LogFilter(self, salt, new_reply, old_reply): |
369 | 392ca296 | Guido Trotter | if not self._logger: |
370 | 392ca296 | Guido Trotter | return
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371 | 392ca296 | Guido Trotter | |
372 | 392ca296 | Guido Trotter | if new_reply.serial > old_reply.serial:
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373 | 392ca296 | Guido Trotter | self._logger.debug("Filtering confirming answer, with newer" |
374 | 392ca296 | Guido Trotter | " serial for query %s" % salt)
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375 | 392ca296 | Guido Trotter | elif new_reply.serial == old_reply.serial:
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376 | 392ca296 | Guido Trotter | if new_reply.answer != old_reply.answer:
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377 | 392ca296 | Guido Trotter | self._logger.warning("Got incoherent answers for query %s" |
378 | 392ca296 | Guido Trotter | " (serial: %s)" % (salt, new_reply.serial))
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379 | 392ca296 | Guido Trotter | else:
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380 | 392ca296 | Guido Trotter | self._logger.debug("Filtering confirming answer, with same" |
381 | 392ca296 | Guido Trotter | " serial for query %s" % salt)
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382 | 392ca296 | Guido Trotter | else:
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383 | 392ca296 | Guido Trotter | self._logger.debug("Filtering outdated answer for query %s" |
384 | 392ca296 | Guido Trotter | " serial: (%d < %d)" % (salt, old_reply.serial,
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385 | 392ca296 | Guido Trotter | new_reply.serial)) |
386 | 392ca296 | Guido Trotter | |
387 | 392ca296 | Guido Trotter | def _HandleExpire(self, up): |
388 | 392ca296 | Guido Trotter | # if we have no answer we have received none, before the expiration.
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389 | a9613def | Guido Trotter | if up.salt in self._answers: |
390 | a9613def | Guido Trotter | del self._answers[up.salt] |
391 | 392ca296 | Guido Trotter | |
392 | 392ca296 | Guido Trotter | def _HandleReply(self, up): |
393 | 392ca296 | Guido Trotter | """Handle a single confd reply, and decide whether to filter it.
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394 | 392ca296 | Guido Trotter |
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395 | 392ca296 | Guido Trotter | @rtype: boolean
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396 | 392ca296 | Guido Trotter | @return: True if the reply should be filtered, False if it should be passed
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397 | 392ca296 | Guido Trotter | on to the up-callback
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398 | 392ca296 | Guido Trotter |
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399 | 392ca296 | Guido Trotter | """
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400 | 392ca296 | Guido Trotter | filter_upcall = False
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401 | 392ca296 | Guido Trotter | salt = up.salt |
402 | 392ca296 | Guido Trotter | if salt not in self._answers: |
403 | 392ca296 | Guido Trotter | # first answer for a query (don't filter, and record)
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404 | 392ca296 | Guido Trotter | self._answers[salt] = up.server_reply
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405 | 392ca296 | Guido Trotter | elif up.server_reply.serial > self._answers[salt].serial: |
406 | 392ca296 | Guido Trotter | # newer answer (record, and compare contents)
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407 | 392ca296 | Guido Trotter | old_answer = self._answers[salt]
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408 | 392ca296 | Guido Trotter | self._answers[salt] = up.server_reply
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409 | 392ca296 | Guido Trotter | if up.server_reply.answer == old_answer.answer:
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410 | 392ca296 | Guido Trotter | # same content (filter) (version upgrade was unrelated)
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411 | 392ca296 | Guido Trotter | filter_upcall = True
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412 | 392ca296 | Guido Trotter | self._LogFilter(salt, up.server_reply, old_answer)
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413 | 392ca296 | Guido Trotter | # else: different content, pass up a second answer
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414 | 392ca296 | Guido Trotter | else:
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415 | 392ca296 | Guido Trotter | # older or same-version answer (duplicate or outdated, filter)
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416 | 392ca296 | Guido Trotter | filter_upcall = True
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417 | 392ca296 | Guido Trotter | self._LogFilter(salt, up.server_reply, self._answers[salt]) |
418 | 392ca296 | Guido Trotter | |
419 | 392ca296 | Guido Trotter | return filter_upcall
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420 | 392ca296 | Guido Trotter | |
421 | 392ca296 | Guido Trotter | def __call__(self, up): |
422 | 392ca296 | Guido Trotter | """Filtering callback
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423 | 392ca296 | Guido Trotter |
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424 | 392ca296 | Guido Trotter | @type up: L{ConfdUpcallPayload}
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425 | 392ca296 | Guido Trotter | @param up: upper callback
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426 | 392ca296 | Guido Trotter |
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427 | 392ca296 | Guido Trotter | """
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428 | 392ca296 | Guido Trotter | filter_upcall = False
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429 | 392ca296 | Guido Trotter | if up.type == UPCALL_REPLY:
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430 | 392ca296 | Guido Trotter | filter_upcall = self._HandleReply(up)
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431 | 392ca296 | Guido Trotter | elif up.type == UPCALL_EXPIRE:
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432 | 392ca296 | Guido Trotter | self._HandleExpire(up)
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433 | 392ca296 | Guido Trotter | |
434 | 392ca296 | Guido Trotter | if not filter_upcall: |
435 | 392ca296 | Guido Trotter | self._callback(up)
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436 | 04cdf663 | Guido Trotter | |
437 | 04cdf663 | Guido Trotter | |
438 | 04cdf663 | Guido Trotter | class ConfdCountingCallback: |
439 | 04cdf663 | Guido Trotter | """Callback that calls another callback, and counts the answers
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440 | 04cdf663 | Guido Trotter |
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441 | 04cdf663 | Guido Trotter | """
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442 | 04cdf663 | Guido Trotter | def __init__(self, callback, logger=None): |
443 | 04cdf663 | Guido Trotter | """Constructor for ConfdCountingCallback
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444 | 04cdf663 | Guido Trotter |
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445 | 04cdf663 | Guido Trotter | @type callback: f(L{ConfdUpcallPayload})
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446 | 04cdf663 | Guido Trotter | @param callback: function to call when getting answers
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447 | 04cdf663 | Guido Trotter | @type logger: logging.Logger
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448 | 04cdf663 | Guido Trotter | @param logger: optional logger for internal conditions
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449 | 04cdf663 | Guido Trotter |
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450 | 04cdf663 | Guido Trotter | """
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451 | 04cdf663 | Guido Trotter | if not callable(callback): |
452 | 04cdf663 | Guido Trotter | raise errors.ProgrammerError("callback must be callable") |
453 | 04cdf663 | Guido Trotter | |
454 | 04cdf663 | Guido Trotter | self._callback = callback
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455 | 04cdf663 | Guido Trotter | self._logger = logger
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456 | 04cdf663 | Guido Trotter | # answers contains a dict of salt -> count
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457 | 04cdf663 | Guido Trotter | self._answers = {}
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458 | 04cdf663 | Guido Trotter | |
459 | 04cdf663 | Guido Trotter | def RegisterQuery(self, salt): |
460 | 04cdf663 | Guido Trotter | if salt in self._answers: |
461 | 04cdf663 | Guido Trotter | raise errors.ProgrammerError("query already registered") |
462 | 04cdf663 | Guido Trotter | self._answers[salt] = 0 |
463 | 04cdf663 | Guido Trotter | |
464 | 04cdf663 | Guido Trotter | def AllAnswered(self): |
465 | 04cdf663 | Guido Trotter | """Have all the registered queries received at least an answer?
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466 | 04cdf663 | Guido Trotter |
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467 | 04cdf663 | Guido Trotter | """
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468 | 04cdf663 | Guido Trotter | return utils.all(self._answers.values()) |
469 | 04cdf663 | Guido Trotter | |
470 | 04cdf663 | Guido Trotter | def _HandleExpire(self, up): |
471 | 04cdf663 | Guido Trotter | # if we have no answer we have received none, before the expiration.
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472 | 04cdf663 | Guido Trotter | if up.salt in self._answers: |
473 | 04cdf663 | Guido Trotter | del self._answers[up.salt] |
474 | 04cdf663 | Guido Trotter | |
475 | 04cdf663 | Guido Trotter | def _HandleReply(self, up): |
476 | 04cdf663 | Guido Trotter | """Handle a single confd reply, and decide whether to filter it.
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477 | 04cdf663 | Guido Trotter |
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478 | 04cdf663 | Guido Trotter | @rtype: boolean
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479 | 04cdf663 | Guido Trotter | @return: True if the reply should be filtered, False if it should be passed
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480 | 04cdf663 | Guido Trotter | on to the up-callback
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481 | 04cdf663 | Guido Trotter |
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482 | 04cdf663 | Guido Trotter | """
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483 | 04cdf663 | Guido Trotter | if up.salt in self._answers: |
484 | 04cdf663 | Guido Trotter | self._answers[up.salt] += 1 |
485 | 04cdf663 | Guido Trotter | |
486 | 04cdf663 | Guido Trotter | def __call__(self, up): |
487 | 04cdf663 | Guido Trotter | """Filtering callback
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488 | 04cdf663 | Guido Trotter |
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489 | 04cdf663 | Guido Trotter | @type up: L{ConfdUpcallPayload}
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490 | 04cdf663 | Guido Trotter | @param up: upper callback
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491 | 04cdf663 | Guido Trotter |
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492 | 04cdf663 | Guido Trotter | """
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493 | 04cdf663 | Guido Trotter | if up.type == UPCALL_REPLY:
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494 | 04cdf663 | Guido Trotter | self._HandleReply(up)
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495 | 04cdf663 | Guido Trotter | elif up.type == UPCALL_EXPIRE:
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496 | 04cdf663 | Guido Trotter | self._HandleExpire(up)
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497 | 04cdf663 | Guido Trotter | self._callback(up)
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498 | 5b349fd1 | Iustin Pop | |
499 | 5b349fd1 | Iustin Pop | def GetConfdClient(callback): |
500 | 5b349fd1 | Iustin Pop | """Return a client configured using the given callback.
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501 | 5b349fd1 | Iustin Pop |
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502 | 5b349fd1 | Iustin Pop | This is handy to abstract the MC list and HMAC key reading.
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503 | 5b349fd1 | Iustin Pop |
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504 | 5b349fd1 | Iustin Pop | @attention: This should only be called on nodes which are part of a
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505 | 5b349fd1 | Iustin Pop | cluster, since it depends on a valid (ganeti) data directory;
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506 | 5b349fd1 | Iustin Pop | for code running outside of a cluster, you need to create the
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507 | 5b349fd1 | Iustin Pop | client manually
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508 | 5b349fd1 | Iustin Pop |
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509 | 5b349fd1 | Iustin Pop | """
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510 | 5b349fd1 | Iustin Pop | ss = ssconf.SimpleStore() |
511 | 5b349fd1 | Iustin Pop | mc_file = ss.KeyToFilename(constants.SS_MASTER_CANDIDATES_IPS) |
512 | 5b349fd1 | Iustin Pop | mc_list = utils.ReadFile(mc_file).splitlines() |
513 | 5b349fd1 | Iustin Pop | hmac_key = utils.ReadFile(constants.CONFD_HMAC_KEY) |
514 | 5b349fd1 | Iustin Pop | return ConfdClient(hmac_key, mc_list, callback) |