1 {-| External data loader
3 This module holds the external data loading, and thus is the only one
4 depending (via the specialized Text\/Rapi\/Luxi modules) on the actual
5 libraries implementing the low-level protocols.
11 Copyright (C) 2009, 2010, 2011 Google Inc.
13 This program is free software; you can redistribute it and/or modify
14 it under the terms of the GNU General Public License as published by
15 the Free Software Foundation; either version 2 of the License, or
16 (at your option) any later version.
18 This program is distributed in the hope that it will be useful, but
19 WITHOUT ANY WARRANTY; without even the implied warranty of
20 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
21 General Public License for more details.
23 You should have received a copy of the GNU General Public License
24 along with this program; if not, write to the Free Software
25 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
30 module Ganeti.HTools.ExtLoader
36 import Data.Maybe (isJust, fromJust)
38 import System.FilePath
41 import Text.Printf (printf, hPrintf)
43 import qualified Ganeti.HTools.Luxi as Luxi
44 import qualified Ganeti.HTools.Rapi as Rapi
45 import qualified Ganeti.HTools.Simu as Simu
46 import qualified Ganeti.HTools.Text as Text
47 import Ganeti.HTools.Loader (mergeData, checkData, ClusterData(..)
50 import Ganeti.HTools.Types
51 import Ganeti.HTools.CLI
52 import Ganeti.HTools.Utils (sepSplit, tryRead)
55 wrapIO :: IO (Result a) -> IO (Result a)
56 wrapIO = flip catch (return . Bad . show)
58 parseUtilisation :: String -> Result (String, DynUtil)
59 parseUtilisation line =
60 let columns = sepSplit ' ' line
62 [name, cpu, mem, dsk, net] -> do
63 rcpu <- tryRead name cpu
64 rmem <- tryRead name mem
65 rdsk <- tryRead name dsk
66 rnet <- tryRead name net
67 let du = DynUtil { cpuWeight = rcpu, memWeight = rmem
68 , dskWeight = rdsk, netWeight = rnet }
70 _ -> Bad $ "Cannot parse line " ++ line
72 -- | External tool data loader from a variety of sources.
73 loadExternalData :: Options
75 loadExternalData opts = do
76 let mhost = optMaster opts
78 tfile = optDataFile opts
79 simdata = optNodeSim opts
81 setLuxi = isJust lsock
82 setSim = (not . null) simdata
83 setFile = isJust tfile
84 allSet = filter id [setRapi, setLuxi, setFile]
85 exTags = case optExTags opts of
87 Just etl -> map (++ ":") etl
88 exInsts = optExInst opts
90 when (length allSet > 1) $
92 hPutStrLn stderr ("Error: Only one of the rapi, luxi, and data" ++
93 " files options should be given.")
94 exitWith $ ExitFailure 1
96 util_contents <- (case optDynuFile opts of
97 Just path -> readFile path
99 let util_data = mapM parseUtilisation $ lines util_contents
100 util_data' <- (case util_data of
103 hPutStrLn stderr ("Error: can't parse utilisation" ++
105 exitWith $ ExitFailure 1)
108 _ | setRapi -> wrapIO $ Rapi.loadData mhost
109 | setLuxi -> wrapIO $ Luxi.loadData $ fromJust lsock
110 | setSim -> Simu.loadData simdata
111 | setFile -> wrapIO $ Text.loadData $ fromJust tfile
112 | otherwise -> return $ Bad "No backend selected! Exiting."
114 let ldresult = input_data >>= mergeData util_data' exTags exInsts
119 hPrintf stderr "Error: failed to load data. Details:\n%s\n" s
121 exitWith $ ExitFailure 1
123 let (fix_msgs, nl) = checkData (cdNodes cdata) (cdInstances cdata)
125 unless (null fix_msgs || optVerbose opts == 0) $ do
126 hPutStrLn stderr "Warning: cluster has inconsistent data:"
127 hPutStrLn stderr . unlines . map (printf " - %s") $ fix_msgs
129 return cdata {cdNodes = nl}
131 -- | Function to save the cluster data to a file.
132 maybeSaveData :: Maybe FilePath -- ^ The file prefix to save to
133 -> String -- ^ The suffix (extension) to add
134 -> String -- ^ Informational message
135 -> ClusterData -- ^ The cluster data
137 maybeSaveData Nothing _ _ _ = return ()
138 maybeSaveData (Just path) ext msg cdata = do
139 let adata = Text.serializeCluster cdata
140 out_path = path <.> ext
141 writeFile out_path adata
142 hPrintf stderr "The cluster state %s has been written to file '%s'\n"