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{-| Cluster space sizing

-}

{-

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.Hspace (main) where

import Control.Monad

import Data.Char (toUpper, isAlphaNum)

import Data.Function (on)

import Data.List

import Data.Maybe (isJust, fromJust)

import Data.Ord (comparing)

import System (exitWith, ExitCode(..))

import System.IO

import qualified System

import Text.Printf (printf, hPrintf)

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.Instance as Instance

import Ganeti.HTools.Utils

import Ganeti.HTools.Types

import Ganeti.HTools.CLI

import Ganeti.HTools.ExtLoader

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

-- | Options list and functions

options :: [OptType]

options =

    [ oPrintNodes

    , oDataFile

    , oDiskTemplate

    , oNodeSim

    , oRapiMaster

    , oLuxiSocket

    , oVerbose

    , oQuiet

    , oOfflineNode

    , oIMem

    , oIDisk

    , oIVcpus

    , oMaxCpu

    , oMinDisk

    , oTieredSpec

    , oSaveCluster

    , oShowVer

    , oShowHelp

    ]

-- | The allocation phase we're in (initial, after tiered allocs, or

-- after regular allocation).

data Phase = PInitial

           | PFinal

           | PTiered

statsData :: [(String, Cluster.CStats -> String)]

statsData = [ ("SCORE", printf "%.8f" . Cluster.csScore)

            , ("INST_CNT", printf "%d" . Cluster.csNinst)

            , ("MEM_FREE", printf "%d" . Cluster.csFmem)

            , ("MEM_AVAIL", printf "%d" . Cluster.csAmem)

            , ("MEM_RESVD",

               \cs -> printf "%d" (Cluster.csFmem cs - Cluster.csAmem cs))

            , ("MEM_INST", printf "%d" . Cluster.csImem)

            , ("MEM_OVERHEAD",

               \cs -> printf "%d" (Cluster.csXmem cs + Cluster.csNmem cs))

            , ("MEM_EFF",

               \cs -> printf "%.8f" (fromIntegral (Cluster.csImem cs) /

                                     Cluster.csTmem cs))

            , ("DSK_FREE", printf "%d" . Cluster.csFdsk)

            , ("DSK_AVAIL", printf "%d". Cluster.csAdsk)

            , ("DSK_RESVD",

               \cs -> printf "%d" (Cluster.csFdsk cs - Cluster.csAdsk cs))

            , ("DSK_INST", printf "%d" . Cluster.csIdsk)

            , ("DSK_EFF",

               \cs -> printf "%.8f" (fromIntegral (Cluster.csIdsk cs) /

                                    Cluster.csTdsk cs))

            , ("CPU_INST", printf "%d" . Cluster.csIcpu)

            , ("CPU_EFF",

               \cs -> printf "%.8f" (fromIntegral (Cluster.csIcpu cs) /

                                     Cluster.csTcpu cs))

            , ("MNODE_MEM_AVAIL", printf "%d" . Cluster.csMmem)

            , ("MNODE_DSK_AVAIL", printf "%d" . Cluster.csMdsk)

            ]

specData :: [(String, RSpec -> String)]

specData = [ ("MEM", printf "%d" . rspecMem)

           , ("DSK", printf "%d" . rspecDsk)

           , ("CPU", printf "%d" . rspecCpu)

           ]

clusterData :: [(String, Cluster.CStats -> String)]

clusterData = [ ("MEM", printf "%.0f" . Cluster.csTmem)

              , ("DSK", printf "%.0f" . Cluster.csTdsk)

              , ("CPU", printf "%.0f" . Cluster.csTcpu)

              , ("VCPU", printf "%d" . Cluster.csVcpu)

              ]

-- | Function to print stats for a given phase

printStats :: Phase -> Cluster.CStats -> [(String, String)]

printStats ph cs =

  map (\(s, fn) -> (printf "%s_%s" kind s, fn cs)) statsData

  where kind = case ph of

                 PInitial -> "INI"

                 PFinal -> "FIN"

                 PTiered -> "TRL"

-- | Print final stats and related metrics

printResults :: Node.List -> Int -> Int -> [(FailMode, Int)] -> IO ()

printResults fin_nl num_instances allocs sreason = do

  let fin_stats = Cluster.totalResources fin_nl

      fin_instances = num_instances + allocs

  when (num_instances + allocs /= Cluster.csNinst fin_stats) $

       do

         hPrintf stderr "ERROR: internal inconsistency, allocated (%d)\

                        \ != counted (%d)\n" (num_instances + allocs)

                                 (Cluster.csNinst fin_stats) :: IO ()

         exitWith $ ExitFailure 1

  printKeys $ printStats PFinal fin_stats

  printKeys [ ("ALLOC_USAGE", printf "%.8f"

                                ((fromIntegral num_instances::Double) /

                                 fromIntegral fin_instances))

            , ("ALLOC_INSTANCES", printf "%d" allocs)

            , ("ALLOC_FAIL_REASON", map toUpper . show . fst $ head sreason)

            ]

  printKeys $ map (\(x, y) -> (printf "ALLOC_%s_CNT" (show x),

                               printf "%d" y)) sreason

  -- this should be the final entry

  printKeys [("OK", "1")]

-- | Compute the tiered spec counts from a list of allocated

-- instances.

tieredSpecMap :: [Instance.Instance]

              -> [(RSpec, Int)]

tieredSpecMap trl_ixes =

    let fin_trl_ixes = reverse trl_ixes

        ix_byspec = groupBy ((==) `on` Instance.specOf) fin_trl_ixes

        spec_map = map (\ixs -> (Instance.specOf $ head ixs, length ixs))

                   ix_byspec

    in spec_map

-- | Formats a spec map to strings.

formatSpecMap :: [(RSpec, Int)] -> [String]

formatSpecMap =

    map (\(spec, cnt) -> printf "%d,%d,%d=%d" (rspecMem spec)

                         (rspecDsk spec) (rspecCpu spec) cnt)

formatRSpec :: Double -> String -> RSpec -> [(String, String)]

formatRSpec m_cpu s r =

    [ ("KM_" ++ s ++ "_CPU", show $ rspecCpu r)

    , ("KM_" ++ s ++ "_NPU", show $ fromIntegral (rspecCpu r) / m_cpu)

    , ("KM_" ++ s ++ "_MEM", show $ rspecMem r)

    , ("KM_" ++ s ++ "_DSK", show $ rspecDsk r)

    ]

printAllocationStats :: Double -> Node.List -> Node.List -> IO ()

printAllocationStats m_cpu ini_nl fin_nl = do

  let ini_stats = Cluster.totalResources ini_nl

      fin_stats = Cluster.totalResources fin_nl

      (rini, ralo, runa) = Cluster.computeAllocationDelta ini_stats fin_stats

  printKeys $ formatRSpec m_cpu  "USED" rini

  printKeys $ formatRSpec m_cpu "POOL"ralo

  printKeys $ formatRSpec m_cpu "UNAV" runa

-- | Ensure a value is quoted if needed

ensureQuoted :: String -> String

ensureQuoted v = if not (all (\c -> isAlphaNum c || c == '.') v)

                 then '\'':v ++ "'"

                 else v

-- | Format a list of key\/values as a shell fragment

printKeys :: [(String, String)] -> IO ()

printKeys = mapM_ (\(k, v) ->

                   printf "HTS_%s=%s\n" (map toUpper k) (ensureQuoted v))

printInstance :: Node.List -> Instance.Instance -> [String]

printInstance nl i = [ Instance.name i

                     , Container.nameOf nl $ Instance.pNode i

                     , let sdx = Instance.sNode i

                       in if sdx == Node.noSecondary then ""

                          else Container.nameOf nl sdx

                     , show (Instance.mem i)

                     , show (Instance.dsk i)

                     , show (Instance.vcpus i)

                     ]

-- | Optionally print the allocation map

printAllocationMap :: Int -> String

                   -> Node.List -> [Instance.Instance] -> IO ()

printAllocationMap verbose msg nl ixes =

  when (verbose > 1) $ do

    hPutStrLn stderr msg

    hPutStr stderr . unlines . map ((:) ' ' .  intercalate " ") $

            formatTable (map (printInstance nl) (reverse ixes))

                        -- This is the numberic-or-not field

                        -- specification; the first three fields are

                        -- strings, whereas the rest are numeric

                       [False, False, False, True, True, True]

-- | Main function.

main :: IO ()

main = do

  cmd_args <- System.getArgs

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

  unless (null args) $ do

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

         exitWith $ ExitFailure 1

  let verbose = optVerbose opts

      ispec = optISpec opts

      shownodes = optShowNodes opts

      disk_template = optDiskTemplate opts

      req_nodes = Instance.requiredNodes disk_template

  (ClusterData gl fixed_nl il ctags) <- loadExternalData opts

  printKeys $ map (\(a, fn) -> ("SPEC_" ++ a, fn ispec)) specData

  printKeys [ ("SPEC_RQN", printf "%d" req_nodes) ]

  printKeys [ ("SPEC_DISK_TEMPLATE", dtToString disk_template) ]

  let num_instances = length $ Container.elems il

  let offline_names = optOffline opts

      all_nodes = Container.elems fixed_nl

      all_names = map Node.name all_nodes

      offline_wrong = filter (`notElem` all_names) offline_names

      offline_indices = map Node.idx $

                        filter (\n ->

                                 Node.name n `elem` offline_names ||

                                 Node.alias n `elem` offline_names)

                               all_nodes

      m_cpu = optMcpu opts

      m_dsk = optMdsk opts

  when (length offline_wrong > 0) $ do

         hPrintf stderr "Error: Wrong node name(s) set as offline: %s\n"

                     (commaJoin offline_wrong) :: IO ()

         exitWith $ ExitFailure 1

  when (req_nodes /= 1 && req_nodes /= 2) $ do

         hPrintf stderr "Error: Invalid required nodes (%d)\n"

                                            req_nodes :: IO ()

         exitWith $ ExitFailure 1

  let nm = Container.map (\n -> if Node.idx n `elem` offline_indices

                                then Node.setOffline n True

                                else n) fixed_nl

      nl = Container.map (flip Node.setMdsk m_dsk . flip Node.setMcpu m_cpu)

           nm

      csf = commonSuffix fixed_nl il

  when (length csf > 0 && verbose > 1) $

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

  when (isJust shownodes) $

       do

         hPutStrLn stderr "Initial cluster status:"

         hPutStrLn stderr $ Cluster.printNodes nl (fromJust shownodes)

  let ini_cv = Cluster.compCV nl

      ini_stats = Cluster.totalResources nl

  when (verbose > 2) $

         hPrintf stderr "Initial coefficients: overall %.8f, %s\n"

                 ini_cv (Cluster.printStats nl)

  printKeys $ map (\(a, fn) -> ("CLUSTER_" ++ a, fn ini_stats)) clusterData

  printKeys [("CLUSTER_NODES", printf "%d" (length all_nodes))]

  printKeys $ printStats PInitial ini_stats

  let bad_nodes = fst $ Cluster.computeBadItems nl il

      stop_allocation = length bad_nodes > 0

      result_noalloc = ([(FailN1, 1)]::FailStats, nl, il, [], [])

  -- utility functions

  let iofspec spx = Instance.create "new" (rspecMem spx) (rspecDsk spx)

                    (rspecCpu spx) "running" [] True (-1) (-1) disk_template

      exitifbad val = (case val of

                         Bad s -> do

                           hPrintf stderr "Failure: %s\n" s :: IO ()

                           exitWith $ ExitFailure 1

                         Ok x -> return x)

  let reqinst = iofspec ispec

  allocnodes <- exitifbad $ Cluster.genAllocNodes gl nl req_nodes True

  -- Run the tiered allocation, if enabled

  (case optTieredSpec opts of

     Nothing -> return ()

     Just tspec -> do

       (_, trl_nl, trl_il, trl_ixes, _) <-

           if stop_allocation

           then return result_noalloc

           else exitifbad (Cluster.tieredAlloc nl il Nothing (iofspec tspec)

                                  allocnodes [] [])

       let spec_map' = tieredSpecMap trl_ixes

       printAllocationMap verbose "Tiered allocation map" trl_nl trl_ixes

       maybePrintNodes shownodes "Tiered allocation"

                           (Cluster.printNodes trl_nl)

       maybeSaveData (optSaveCluster opts) "tiered" "after tiered allocation"

                     (ClusterData gl trl_nl trl_il ctags)

       printKeys $ map (\(a, fn) -> ("TSPEC_INI_" ++ a, fn tspec)) specData

       printKeys $ printStats PTiered (Cluster.totalResources trl_nl)

       printKeys [("TSPEC", intercalate " " (formatSpecMap spec_map'))]

       printAllocationStats m_cpu nl trl_nl)

  -- Run the standard (avg-mode) allocation

  (ereason, fin_nl, fin_il, ixes, _) <-

      if stop_allocation

      then return result_noalloc

      else exitifbad (Cluster.iterateAlloc nl il Nothing

                      reqinst allocnodes [] [])

  let allocs = length ixes

      sreason = reverse $ sortBy (comparing snd) ereason

  printAllocationMap verbose "Standard allocation map" fin_nl ixes

  maybePrintNodes shownodes "Standard allocation" (Cluster.printNodes fin_nl)

  maybeSaveData (optSaveCluster opts) "alloc" "after standard allocation"

       (ClusterData gl fin_nl fin_il ctags)

  printResults fin_nl num_instances allocs sreason