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{-| Cluster information printer.

-}

{-

Copyright (C) 2012 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.Hinfo

  ( main

  , options

  , arguments

  ) where

import Control.Monad

import Data.List

import System.Exit

import System.IO

import Text.Printf (printf)

import qualified Ganeti.HTools.Container as Container

import qualified Ganeti.HTools.Cluster as Cluster

import qualified Ganeti.HTools.Node as Node

import qualified Ganeti.HTools.Group as Group

import qualified Ganeti.HTools.Instance as Instance

import Ganeti.Common

import Ganeti.HTools.CLI

import Ganeti.HTools.ExtLoader

import Ganeti.HTools.Loader

import Ganeti.Utils

-- | Options list and functions.

options :: [OptType]

options =

  [ oPrintNodes

  , oPrintInsts

  , oDataFile

  , oRapiMaster

  , oLuxiSocket

  , oIAllocSrc

  , oVerbose

  , oQuiet

  , oOfflineNode

  ]

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

arguments :: [ArgCompletion]

arguments = []

-- | Group information data-type.

data GroupInfo = GroupInfo { giName      :: String

                           , giNodeCount :: Int

                           , giInstCount :: Int

                           , giBadNodes  :: Int

                           , giBadInsts  :: Int

                           , giN1Status  :: Bool

                           , giScore     :: Double

                           }

-- | Node group statistics.

calcGroupInfo :: Group.Group

              -> Node.List

              -> Instance.List

              -> GroupInfo

calcGroupInfo g nl il =

  let nl_size                    = Container.size nl

      il_size                    = Container.size il

      (bad_nodes, bad_instances) = Cluster.computeBadItems nl il

      bn_size                    = length bad_nodes

      bi_size                    = length bad_instances

      n1h                        = bn_size == 0

      score                      = Cluster.compCV nl

  in GroupInfo (Group.name g) nl_size il_size bn_size bi_size n1h score

-- | Helper to format one group row result.

groupRowFormatHelper :: GroupInfo -> [String]

groupRowFormatHelper gi =

  [ giName gi

  , printf "%d" $ giNodeCount gi

  , printf "%d" $ giInstCount gi

  , printf "%d" $ giBadNodes gi

  , printf "%d" $ giBadInsts gi

  , show $ giN1Status gi

  , printf "%.8f" $ giScore gi

  ]

-- | Print node group information.

showGroupInfo :: Int -> Group.List -> Node.List -> Instance.List -> IO ()

showGroupInfo verbose gl nl il = do

  let cgrs   = map (\(gdx, (gnl, gil)) ->

                 calcGroupInfo (Container.find gdx gl) gnl gil) $

                 Cluster.splitCluster nl il

      cn1h   = all giN1Status cgrs

      grs    = map groupRowFormatHelper cgrs

      header = ["Group", "Nodes", "Instances", "Bad_Nodes", "Bad_Instances",

                "N+1", "Score"]

  when (verbose > 1) $

    printf "Node group information:\n%s"

           (printTable "  " header grs [False, True, True, True, True,

                                        False, True])

  printf "Cluster is N+1 %s\n" $ if cn1h then "happy" else "unhappy"

-- | Gather and print split instances.

splitInstancesInfo :: Int -> Node.List -> Instance.List -> IO ()

splitInstancesInfo verbose nl il = do

  let split_insts = Cluster.findSplitInstances nl il

  if null split_insts

    then

      when (verbose > 1) $

        putStrLn "No split instances found"::IO ()

    else do

      putStrLn "Found instances belonging to multiple node groups:"

      mapM_ (\i -> hPutStrLn stderr $ "  " ++ Instance.name i) split_insts

-- | Print common (interesting) information.

commonInfo :: Int -> Group.List -> Node.List -> Instance.List -> IO ()

commonInfo verbose gl nl il = do

  when (Container.null il && verbose > 1) $

    printf "Cluster is empty.\n"::IO ()

  let nl_size = Container.size nl

      il_size = Container.size il

      gl_size = Container.size gl

  printf "Loaded %d %s, %d %s, %d %s\n"

             nl_size (plural nl_size "node" "nodes")

             il_size (plural il_size "instance" "instances")

             gl_size (plural gl_size "node group" "node groups")::IO ()

  let csf = commonSuffix nl il

  when (not (null csf) && verbose > 2) $

       printf "Note: Stripping common suffix of '%s' from names\n" csf

-- | Main function.

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

main opts args = do

  unless (null args) $ do

         hPutStrLn stderr "Error: this program doesn't take any arguments."

         exitWith $ ExitFailure 1

  let verbose = optVerbose opts

      shownodes = optShowNodes opts

      showinsts = optShowInsts opts

  (ClusterData gl fixed_nl ilf ctags ipol) <- loadExternalData opts

  putStrLn $ "Loaded cluster tags: " ++ intercalate "," ctags

  when (verbose > 2) .

       putStrLn $ "Loaded cluster ipolicy: " ++ show ipol

  nlf <- setNodeStatus opts fixed_nl

  commonInfo verbose gl nlf ilf

  splitInstancesInfo verbose nlf ilf

  showGroupInfo verbose gl nlf ilf

  maybePrintInsts showinsts "Instances" (Cluster.printInsts nlf ilf)

  maybePrintNodes shownodes "Cluster" (Cluster.printNodes nlf)

  printf "Cluster coefficients:\n%s" (Cluster.printStats "  " nlf)::IO ()

  printf "Cluster score: %.8f\n" (Cluster.compCV nlf)