Synnefo » snf-ganeti » ganeti-local

{-| IAllocator plugin for Ganeti.

-}

{-

Copyright (C) 2009, 2010, 2011, 2012, 2013 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

  , options

  , arguments

  ) where

import Control.Monad

import Data.Maybe (fromMaybe, isJust)

import System.IO

import qualified Ganeti.HTools.Cluster as Cluster

import Ganeti.Common

import Ganeti.HTools.CLI

import Ganeti.HTools.Backend.IAlloc

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

import Ganeti.HTools.ExtLoader (maybeSaveData, loadExternalData)

import Ganeti.Utils

-- | Options list and functions.

options :: IO [OptType]

options =

  return

    [ oPrintNodes

    , oSaveCluster

    , oDataFile

    , oNodeSim

    , oVerbose

    ]

-- | The list of arguments supported by the program.

arguments :: [ArgCompletion]

arguments = [ArgCompletion OptComplFile 1 (Just 1)]

wrapReadRequest :: Options -> [String] -> IO Request

wrapReadRequest opts args = do

  r1 <- case args of

          []    -> exitErr "This program needs an input file."

          _:_:_ -> exitErr "Only one argument is accepted (the input file)"

          x:_   -> readRequest x

  if isJust (optDataFile opts) ||  (not . null . optNodeSim) opts

    then do

      cdata <- loadExternalData opts

      let Request rqt _ = r1

      return $ Request rqt cdata

    else return r1

-- | Main function.

main :: Options -> [String] -> IO ()

main opts args = do

  let shownodes = optShowNodes opts

      verbose = optVerbose opts

      savecluster = optSaveCluster opts

  request <- wrapReadRequest 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) = fromMaybe (cdNodes cdata, cdInstances cdata) 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})