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{-| IAllocator plugin for Ganeti.

-}

{-

Copyright (C) 2009, 2010, 2011 Google Inc.

This program is free software; you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation; either version 2 of the License, or

(at your option) any later version.

This program is distributed in the hope that it will be useful, but

WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

General Public License for more details.

You should have received a copy of the GNU General Public License

along with this program; if not, write to the Free Software

Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

02110-1301, USA.

-}

module Ganeti.HTools.Program.Hail (main) where

import Control.Monad

import System.Environment (getArgs)

import System.IO

import qualified Ganeti.HTools.Cluster as Cluster

import Ganeti.HTools.CLI

import Ganeti.HTools.IAlloc

import Ganeti.HTools.Loader (Request(..), ClusterData(..))

import Ganeti.HTools.ExtLoader (maybeSaveData)

-- | Options list and functions.

options :: [OptType]

options =

  [ oPrintNodes

  , oSaveCluster

  , oDataFile

  , oNodeSim

  , oVerbose

  , oShowVer

  , oShowHelp

  ]

-- | Main function.

main :: IO ()

main = do

  cmd_args <- getArgs

  (opts, args) <- parseOpts cmd_args "hail" options

  let shownodes = optShowNodes opts

      verbose = optVerbose opts

      savecluster = optSaveCluster opts

  request <- readRequest opts args

  let Request rq cdata = request

  when (verbose > 1) $

       hPutStrLn stderr $ "Received request: " ++ show rq

  when (verbose > 2) $

       hPutStrLn stderr $ "Received cluster data: " ++ show cdata

  maybePrintNodes shownodes "Initial cluster"

       (Cluster.printNodes (cdNodes cdata))

  maybeSaveData savecluster "pre-ialloc" "before iallocator run" cdata

  let (maybe_ni, resp) = runIAllocator request

      (fin_nl, fin_il) = maybe (cdNodes cdata, cdInstances cdata) id maybe_ni

  putStrLn resp

  maybePrintNodes shownodes "Final cluster" (Cluster.printNodes fin_nl)

  maybeSaveData savecluster "post-ialloc" "after iallocator run"

       (cdata { cdNodes = fin_nl, cdInstances = fin_il})