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, 2012 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
37 import Control.Exception
38 import Data.Maybe (isJust, fromJust)
39 import System.FilePath
41 import Text.Printf (hPrintf)
43 import qualified Ganeti.HTools.Backend.Luxi as Luxi
44 import qualified Ganeti.HTools.Backend.Rapi as Rapi
45 import qualified Ganeti.HTools.Backend.Simu as Simu
46 import qualified Ganeti.HTools.Backend.Text as Text
47 import qualified Ganeti.HTools.Backend.IAlloc as IAlloc
48 import Ganeti.HTools.Loader (mergeData, checkData, ClusterData(..)
51 import Ganeti.BasicTypes
52 import Ganeti.HTools.Types
53 import Ganeti.HTools.CLI
54 import Ganeti.Utils (sepSplit, tryRead, exitIfBad, exitWhen)
56 -- | Error beautifier.
57 wrapIO :: IO (Result a) -> IO (Result a)
58 wrapIO = handle (\e -> return . Bad . show $ (e::IOException))
60 -- | Parses a user-supplied utilisation string.
61 parseUtilisation :: String -> Result (String, DynUtil)
62 parseUtilisation line =
63 case sepSplit ' ' line of
64 [name, cpu, mem, dsk, net] ->
66 rcpu <- tryRead name cpu
67 rmem <- tryRead name mem
68 rdsk <- tryRead name dsk
69 rnet <- tryRead name net
70 let du = DynUtil { cpuWeight = rcpu, memWeight = rmem
71 , dskWeight = rdsk, netWeight = rnet }
73 _ -> Bad $ "Cannot parse line " ++ line
75 -- | External tool data loader from a variety of sources.
76 loadExternalData :: Options
78 loadExternalData opts = do
79 let mhost = optMaster opts
81 tfile = optDataFile opts
82 simdata = optNodeSim opts
83 iallocsrc = optIAllocSrc opts
85 setLuxi = isJust lsock
86 setSim = (not . null) simdata
87 setFile = isJust tfile
88 setIAllocSrc = isJust iallocsrc
89 allSet = filter id [setRapi, setLuxi, setFile]
90 exTags = case optExTags opts of
92 Just etl -> map (++ ":") etl
93 selInsts = optSelInst opts
94 exInsts = optExInst opts
96 exitWhen (length allSet > 1) "Only one of the rapi, luxi, and data\
97 \ files options should be given."
99 util_contents <- maybe (return "") readFile (optDynuFile opts)
100 util_data <- exitIfBad "can't parse utilisation data" .
101 mapM parseUtilisation $ lines util_contents
104 _ | setRapi -> wrapIO $ Rapi.loadData mhost
105 | setLuxi -> wrapIO . Luxi.loadData $ fromJust lsock
106 | setSim -> Simu.loadData simdata
107 | setFile -> wrapIO . Text.loadData $ fromJust tfile
108 | setIAllocSrc -> wrapIO . IAlloc.loadData $ fromJust iallocsrc
109 | otherwise -> return $ Bad "No backend selected! Exiting."
111 let ldresult = input_data >>= mergeData util_data exTags selInsts exInsts
112 cdata <- exitIfBad "failed to load data, aborting" ldresult
113 let (fix_msgs, nl) = checkData (cdNodes cdata) (cdInstances cdata)
115 unless (optVerbose opts == 0) $ maybeShowWarnings fix_msgs
117 return cdata {cdNodes = nl}
119 -- | Function to save the cluster data to a file.
120 maybeSaveData :: Maybe FilePath -- ^ The file prefix to save to
121 -> String -- ^ The suffix (extension) to add
122 -> String -- ^ Informational message
123 -> ClusterData -- ^ The cluster data
125 maybeSaveData Nothing _ _ _ = return ()
126 maybeSaveData (Just path) ext msg cdata = do
127 let adata = Text.serializeCluster cdata
128 out_path = path <.> ext
129 writeFile out_path adata
130 hPrintf stderr "The cluster state %s has been written to file '%s'\n"