root / Ganeti / HTools / ExtLoader.hs @ aa8d2e71
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{-# LANGUAGE CPP #-} |
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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 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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) where |
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import Data.Maybe (isJust, fromJust) |
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import Monad |
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import System.Posix.Env |
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import System.IO |
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import System |
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import Text.Printf (printf, hPrintf) |
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|
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import qualified Ganeti.HTools.Luxi as Luxi |
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#ifndef NO_CURL |
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import qualified Ganeti.HTools.Rapi as Rapi |
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#endif |
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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.Loader as Loader |
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import qualified Ganeti.HTools.Instance as Instance |
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import qualified Ganeti.HTools.Node as Node |
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|
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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) |
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-- | Parse the environment and return the node\/instance names. |
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-- |
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-- This also hardcodes here the default node\/instance file names. |
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parseEnv :: () -> IO (String, String) |
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parseEnv () = do |
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a <- getEnvDefault "HTOOLS_NODES" "nodes" |
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b <- getEnvDefault "HTOOLS_INSTANCES" "instances" |
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return (a, b) |
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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 (return . Bad . show) |
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|
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parseUtilisation :: String -> Result (String, DynUtil) |
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parseUtilisation line = |
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let columns = sepSplit ' ' line |
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in case columns of |
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[name, cpu, mem, dsk, net] -> 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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|
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-- | External tool data loader from a variety of sources. |
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loadExternalData :: Options |
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-> IO (Node.List, Instance.List, String) |
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loadExternalData opts = do |
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(env_node, env_inst) <- parseEnv () |
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let nodef = if optNodeSet opts then optNodeFile opts |
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else env_node |
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instf = if optInstSet opts then optInstFile opts |
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else env_inst |
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mhost = optMaster opts |
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lsock = optLuxi opts |
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simdata = optNodeSim opts |
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setRapi = mhost /= "" |
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setLuxi = isJust lsock |
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setSim = isJust simdata |
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setFiles = optNodeSet opts || optInstSet opts |
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allSet = filter id [setRapi, setLuxi, setFiles] |
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when (length allSet > 1) $ |
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do |
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hPutStrLn stderr ("Error: Only one of the rapi, luxi, and data" ++ |
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" files options should be given.") |
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exitWith $ ExitFailure 1 |
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util_contents <- (case optDynuFile opts of |
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Just path -> readFile path |
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Nothing -> return "") |
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let util_data = mapM parseUtilisation $ lines util_contents |
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util_data' <- (case util_data of |
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Ok x -> return x |
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Bad y -> do |
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hPutStrLn stderr ("Error: can't parse utilisation" ++ |
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" data: " ++ show y) |
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exitWith $ ExitFailure 1) |
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input_data <- |
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case () of |
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_ | setRapi -> |
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#ifdef NO_CURL |
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return $ Bad "RAPI/curl backend disabled at compile time" |
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#else |
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wrapIO $ Rapi.loadData mhost |
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#endif |
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| setLuxi -> wrapIO $ Luxi.loadData $ fromJust lsock |
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| setSim -> Simu.loadData $ fromJust simdata |
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| otherwise -> wrapIO $ Text.loadData nodef instf |
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let ldresult = input_data >>= Loader.mergeData util_data' |
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(loaded_nl, il, csf) <- |
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(case ldresult of |
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Ok x -> return x |
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Bad s -> do |
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hPrintf stderr "Error: failed to load data. Details:\n%s\n" s |
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exitWith $ ExitFailure 1 |
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) |
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let (fix_msgs, fixed_nl) = Loader.checkData loaded_nl il |
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unless (null fix_msgs || optVerbose opts == 0) $ do |
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hPutStrLn stderr "Warning: cluster has inconsistent data:" |
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hPutStrLn stderr . unlines . map (printf " - %s") $ fix_msgs |
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return (fixed_nl, il, csf) |