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{-| Solver for N+1 cluster errors |
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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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module Main (main) where |
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import Data.List |
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import Data.Maybe (isJust, fromJust) |
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import Monad |
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import System (exitWith, ExitCode(..)) |
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import System.IO |
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import qualified System |
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import Text.Printf (printf) |
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import qualified Ganeti.HTools.Cluster as Cluster |
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import qualified Ganeti.HTools.Node as Node |
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import Ganeti.HTools.CLI |
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import Ganeti.HTools.IAlloc |
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import Ganeti.HTools.Types |
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import Ganeti.HTools.Loader (RqType(..), Request(..)) |
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|
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-- | Options list and functions |
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options :: [OptType] |
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options = [oPrintNodes, oShowVer, oShowHelp] |
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|
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processResults :: (Monad m) => |
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RqType -> Cluster.AllocSolution |
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-> m (String, Cluster.AllocSolution) |
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processResults _ (_, _, []) = fail "No valid allocation solutions" |
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processResults (Evacuate _) as@(fstats, successes, sols) = |
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let best = fst $ head sols |
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tfails = length fstats |
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info = printf "for last allocation, successes %d, failures %d,\ |
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\ best score: %.8f" successes tfails best::String |
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in return (info, as) |
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processResults _ as@(fstats, successes, sols) = |
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case sols of |
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(best, (_, _, w)):[] -> |
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let tfails = length fstats |
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info = printf "successes %d, failures %d,\ |
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\ best score: %.8f for node(s) %s" |
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successes tfails |
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best (intercalate "/" . map Node.name $ w)::String |
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in return (info, as) |
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_ -> fail "Internal error: multiple allocation solutions" |
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-- | Process a request and return new node lists |
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processRequest :: Request |
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-> Result Cluster.AllocSolution |
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processRequest request = |
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let Request rqtype nl il _ = request |
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in case rqtype of |
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Allocate xi reqn -> Cluster.tryAlloc nl il xi reqn |
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Relocate idx reqn exnodes -> Cluster.tryReloc nl il idx reqn exnodes |
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Evacuate exnodes -> Cluster.tryEvac nl il exnodes |
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|
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-- | Main function. |
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main :: IO () |
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main = do |
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cmd_args <- System.getArgs |
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(opts, args) <- parseOpts cmd_args "hail" options |
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when (null args) $ do |
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hPutStrLn stderr "Error: this program needs an input file." |
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exitWith $ ExitFailure 1 |
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let input_file = head args |
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shownodes = optShowNodes opts |
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input_data <- readFile input_file |
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request <- case (parseData input_data) of |
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Bad err -> do |
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hPutStrLn stderr $ "Error: " ++ err |
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exitWith $ ExitFailure 1 |
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Ok rq -> return rq |
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let Request rq nl _ _ = request |
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when (isJust shownodes) $ do |
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hPutStrLn stderr "Initial cluster status:" |
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hPutStrLn stderr $ Cluster.printNodes nl (fromJust shownodes) |
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let sols = processRequest request >>= processResults rq |
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let (ok, info, rn) = |
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case sols of |
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Ok (ginfo, (_, _, sn)) -> (True, "Request successful: " ++ ginfo, |
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map snd sn) |
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Bad s -> (False, "Request failed: " ++ s, []) |
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resp = formatResponse ok info rq rn |
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putStrLn resp |