root / htools / Ganeti / HTools / ExtLoader.hs @ eaed5f19
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{-| External data loader. |
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This module holds the external data loading, and thus is the only one |
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depending (via the specialized Text\/Rapi\/Luxi modules) on the actual |
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libraries implementing the low-level protocols. |
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-} |
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{- |
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Copyright (C) 2009, 2010, 2011, 2012 Google Inc. |
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This program is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 2 of the License, or |
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(at your option) any later version. |
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|
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This program is distributed in the hope that it will be useful, but |
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WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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General Public License for more details. |
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|
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You should have received a copy of the GNU General Public License |
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along with this program; if not, write to the Free Software |
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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02110-1301, USA. |
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|
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-} |
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module Ganeti.HTools.ExtLoader |
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( loadExternalData |
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, commonSuffix |
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, maybeSaveData |
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) where |
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|
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import Control.Monad |
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import Control.Exception |
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import Data.Maybe (isJust, fromJust) |
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import Prelude hiding (catch) |
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import System.FilePath |
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import System.IO |
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import Text.Printf (hPrintf) |
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import qualified Ganeti.HTools.Luxi as Luxi |
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import qualified Ganeti.HTools.Rapi as Rapi |
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import qualified Ganeti.HTools.Simu as Simu |
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import qualified Ganeti.HTools.Text as Text |
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import qualified Ganeti.HTools.IAlloc as IAlloc |
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import Ganeti.HTools.Loader (mergeData, checkData, ClusterData(..) |
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, commonSuffix) |
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import Ganeti.HTools.Types |
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import Ganeti.HTools.CLI |
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import Ganeti.HTools.Utils (sepSplit, tryRead, exitIfBad, exitWhen) |
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|
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-- | Error beautifier. |
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wrapIO :: IO (Result a) -> IO (Result a) |
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wrapIO = flip catch (\e -> return . Bad . show $ (e::IOException)) |
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-- | Parses a user-supplied utilisation string. |
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parseUtilisation :: String -> Result (String, DynUtil) |
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parseUtilisation line = |
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case sepSplit ' ' line of |
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[name, cpu, mem, dsk, net] -> |
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do |
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rcpu <- tryRead name cpu |
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rmem <- tryRead name mem |
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rdsk <- tryRead name dsk |
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rnet <- tryRead name net |
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let du = DynUtil { cpuWeight = rcpu, memWeight = rmem |
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, dskWeight = rdsk, netWeight = rnet } |
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return (name, du) |
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_ -> Bad $ "Cannot parse line " ++ line |
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-- | External tool data loader from a variety of sources. |
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loadExternalData :: Options |
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-> IO ClusterData |
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loadExternalData opts = do |
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let mhost = optMaster opts |
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lsock = optLuxi opts |
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tfile = optDataFile opts |
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simdata = optNodeSim opts |
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iallocsrc = optIAllocSrc opts |
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setRapi = mhost /= "" |
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setLuxi = isJust lsock |
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setSim = (not . null) simdata |
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setFile = isJust tfile |
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setIAllocSrc = isJust iallocsrc |
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allSet = filter id [setRapi, setLuxi, setFile] |
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exTags = case optExTags opts of |
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Nothing -> [] |
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Just etl -> map (++ ":") etl |
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selInsts = optSelInst opts |
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exInsts = optExInst opts |
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exitWhen (length allSet > 1) "Only one of the rapi, luxi, and data\ |
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\ files options should be given" |
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util_contents <- maybe (return "") readFile (optDynuFile opts) |
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util_data <- exitIfBad "can't parse utilisation data" . |
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mapM parseUtilisation $ lines util_contents |
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input_data <- |
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case () of |
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_ | setRapi -> wrapIO $ Rapi.loadData mhost |
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| setLuxi -> wrapIO $ Luxi.loadData $ fromJust lsock |
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| setSim -> Simu.loadData simdata |
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| setFile -> wrapIO $ Text.loadData $ fromJust tfile |
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| setIAllocSrc -> wrapIO $ IAlloc.loadData $ fromJust iallocsrc |
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| otherwise -> return $ Bad "No backend selected! Exiting." |
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let ldresult = input_data >>= mergeData util_data exTags selInsts exInsts |
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cdata <- exitIfBad "failed to load data, aborting" ldresult |
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let (fix_msgs, nl) = checkData (cdNodes cdata) (cdInstances cdata) |
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unless (optVerbose opts == 0) $ maybeShowWarnings fix_msgs |
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return cdata {cdNodes = nl} |
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-- | Function to save the cluster data to a file. |
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maybeSaveData :: Maybe FilePath -- ^ The file prefix to save to |
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-> String -- ^ The suffix (extension) to add |
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-> String -- ^ Informational message |
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-> ClusterData -- ^ The cluster data |
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-> IO () |
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maybeSaveData Nothing _ _ _ = return () |
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maybeSaveData (Just path) ext msg cdata = do |
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let adata = Text.serializeCluster cdata |
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out_path = path <.> ext |
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writeFile out_path adata |
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hPrintf stderr "The cluster state %s has been written to file '%s'\n" |
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msg out_path |