root / src / Ganeti / Query / Cluster.hs @ 88772d17
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1 | 1c3231aa | Thomas Thrainer | {-| Implementation of the Ganeti Query2 cluster queries. |
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2 | 1c3231aa | Thomas Thrainer | |
3 | 1c3231aa | Thomas Thrainer | -} |
4 | 1c3231aa | Thomas Thrainer | |
5 | 1c3231aa | Thomas Thrainer | {- |
6 | 1c3231aa | Thomas Thrainer | |
7 | 1c3231aa | Thomas Thrainer | Copyright (C) 2012, 2013 Google Inc. |
8 | 1c3231aa | Thomas Thrainer | |
9 | 1c3231aa | Thomas Thrainer | This program is free software; you can redistribute it and/or modify |
10 | 1c3231aa | Thomas Thrainer | it under the terms of the GNU General Public License as published by |
11 | 1c3231aa | Thomas Thrainer | the Free Software Foundation; either version 2 of the License, or |
12 | 1c3231aa | Thomas Thrainer | (at your option) any later version. |
13 | 1c3231aa | Thomas Thrainer | |
14 | 1c3231aa | Thomas Thrainer | This program is distributed in the hope that it will be useful, but |
15 | 1c3231aa | Thomas Thrainer | WITHOUT ANY WARRANTY; without even the implied warranty of |
16 | 1c3231aa | Thomas Thrainer | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
17 | 1c3231aa | Thomas Thrainer | General Public License for more details. |
18 | 1c3231aa | Thomas Thrainer | |
19 | 1c3231aa | Thomas Thrainer | You should have received a copy of the GNU General Public License |
20 | 1c3231aa | Thomas Thrainer | along with this program; if not, write to the Free Software |
21 | 1c3231aa | Thomas Thrainer | Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
22 | 1c3231aa | Thomas Thrainer | 02110-1301, USA. |
23 | 1c3231aa | Thomas Thrainer | |
24 | 1c3231aa | Thomas Thrainer | -} |
25 | 1c3231aa | Thomas Thrainer | |
26 | 1c3231aa | Thomas Thrainer | module Ganeti.Query.Cluster |
27 | 1c3231aa | Thomas Thrainer | ( clusterMasterNodeName |
28 | 7f58ff5d | Klaus Aehlig | , isWatcherPaused |
29 | 1c3231aa | Thomas Thrainer | ) where |
30 | 1c3231aa | Thomas Thrainer | |
31 | 7f58ff5d | Klaus Aehlig | import Control.Exception (try) |
32 | 1c3231aa | Thomas Thrainer | import Control.Monad (liftM) |
33 | 7f58ff5d | Klaus Aehlig | import Data.Char (isSpace) |
34 | 7f58ff5d | Klaus Aehlig | import Numeric (readDec) |
35 | 1c3231aa | Thomas Thrainer | |
36 | 1c3231aa | Thomas Thrainer | import Ganeti.Config |
37 | 1c3231aa | Thomas Thrainer | import Ganeti.Errors |
38 | 7f58ff5d | Klaus Aehlig | import Ganeti.Logging |
39 | 7f58ff5d | Klaus Aehlig | import Ganeti.Objects |
40 | 7f58ff5d | Klaus Aehlig | import Ganeti.Path |
41 | 7f58ff5d | Klaus Aehlig | import Ganeti.Utils (getCurrentTime) |
42 | 1c3231aa | Thomas Thrainer | |
43 | 1c3231aa | Thomas Thrainer | -- | Get master node name. |
44 | 1c3231aa | Thomas Thrainer | clusterMasterNodeName :: ConfigData -> ErrorResult String |
45 | 1c3231aa | Thomas Thrainer | clusterMasterNodeName cfg = |
46 | 1c3231aa | Thomas Thrainer | let cluster = configCluster cfg |
47 | 1c3231aa | Thomas Thrainer | masterNodeUuid = clusterMasterNode cluster |
48 | 1c3231aa | Thomas Thrainer | in liftM nodeName $ getNode cfg masterNodeUuid |
49 | 7f58ff5d | Klaus Aehlig | |
50 | 7f58ff5d | Klaus Aehlig | isWatcherPaused :: IO (Maybe Integer) |
51 | 7f58ff5d | Klaus Aehlig | isWatcherPaused = do |
52 | 7f58ff5d | Klaus Aehlig | logDebug "Checking if the watcher is paused" |
53 | 7f58ff5d | Klaus Aehlig | wfile <- watcherPauseFile |
54 | 7f58ff5d | Klaus Aehlig | contents <- try $ readFile wfile :: IO (Either IOError String) |
55 | 7f58ff5d | Klaus Aehlig | case contents of |
56 | 7f58ff5d | Klaus Aehlig | Left _ -> return Nothing |
57 | 7f58ff5d | Klaus Aehlig | Right s -> case readDec (dropWhile isSpace s) of |
58 | 7f58ff5d | Klaus Aehlig | [(n, rest)] | all isSpace rest -> do |
59 | 7f58ff5d | Klaus Aehlig | now <- getCurrentTime |
60 | 7f58ff5d | Klaus Aehlig | return $ if n > now then Just n else Nothing |
61 | 7f58ff5d | Klaus Aehlig | _ -> do |
62 | 7f58ff5d | Klaus Aehlig | logWarning $ "Watcher pause file contents '" ++ s |
63 | 7f58ff5d | Klaus Aehlig | ++ "' not parsable as int" |
64 | 7f58ff5d | Klaus Aehlig | return Nothing |