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{-| Implementation of command-line functions.

This module holds the common command-line related functions for the

binaries, separated into this module since "Ganeti.HTools.Utils" is

used in many other places and this is more IO oriented.

-}

{-

Copyright (C) 2009, 2010, 2011, 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.CLI

  ( Options(..)

  , OptType

  , parseOpts

  , parseOptsInner

  , parseYesNo

  , parseISpecString

  , shTemplate

  , defaultLuxiSocket

  , maybePrintNodes

  , maybePrintInsts

  , maybeShowWarnings

  , setNodeStatus

  -- * The options

  , oDataFile

  , oDiskMoves

  , oDiskTemplate

  , oDynuFile

  , oEvacMode

  , oExInst

  , oExTags

  , oExecJobs

  , oGroup

  , oInstMoves

  , oLuxiSocket

  , oMachineReadable

  , oMaxCpu

  , oMaxSolLength

  , oMinDisk

  , oMinGain

  , oMinGainLim

  , oMinScore

  , oNoHeaders

  , oNodeSim

  , oOfflineNode

  , oOutputDir

  , oPrintCommands

  , oPrintInsts

  , oPrintNodes

  , oQuiet

  , oRapiMaster

  , oReplay

  , oSaveCluster

  , oSelInst

  , oShowHelp

  , oShowVer

  , oStdSpec

  , oTieredSpec

  , oVerbose

  ) where

import Control.Monad

import Data.Maybe (fromMaybe)

import qualified Data.Version

import System.Console.GetOpt

import System.IO

import System.Info

import System.Exit

import Text.Printf (printf, hPrintf)

import qualified Ganeti.HTools.Version as Version(version)

import qualified Ganeti.HTools.Container as Container

import qualified Ganeti.HTools.Node as Node

import qualified Ganeti.Constants as C

import Ganeti.HTools.Types

import Ganeti.HTools.Utils

import Ganeti.HTools.Loader

-- * Constants

-- | The default value for the luxi socket.

--

-- This is re-exported from the "Ganeti.Constants" module.

defaultLuxiSocket :: FilePath

defaultLuxiSocket = C.masterSocket

-- * Data types

-- | Command line options structure.

data Options = Options

  { optDataFile    :: Maybe FilePath -- ^ Path to the cluster data file

  , optDiskMoves   :: Bool           -- ^ Allow disk moves

  , optInstMoves   :: Bool           -- ^ Allow instance moves

  , optDiskTemplate :: Maybe DiskTemplate  -- ^ Override for the disk template

  , optDynuFile    :: Maybe FilePath -- ^ Optional file with dynamic use data

  , optEvacMode    :: Bool           -- ^ Enable evacuation mode

  , optExInst      :: [String]       -- ^ Instances to be excluded

  , optExTags      :: Maybe [String] -- ^ Tags to use for exclusion

  , optExecJobs    :: Bool           -- ^ Execute the commands via Luxi

  , optGroup       :: Maybe GroupID  -- ^ The UUID of the group to process

  , optSelInst     :: [String]       -- ^ Instances to be excluded

  , optLuxi        :: Maybe FilePath -- ^ Collect data from Luxi

  , optMachineReadable :: Bool       -- ^ Output machine-readable format

  , optMaster      :: String         -- ^ Collect data from RAPI

  , optMaxLength   :: Int            -- ^ Stop after this many steps

  , optMcpu        :: Double         -- ^ Max cpu ratio for nodes

  , optMdsk        :: Double         -- ^ Max disk usage ratio for nodes

  , optMinGain     :: Score          -- ^ Min gain we aim for in a step

  , optMinGainLim  :: Score          -- ^ Limit below which we apply mingain

  , optMinScore    :: Score          -- ^ The minimum score we aim for

  , optNoHeaders   :: Bool           -- ^ Do not show a header line

  , optNodeSim     :: [String]       -- ^ Cluster simulation mode

  , optOffline     :: [String]       -- ^ Names of offline nodes

  , optOutPath     :: FilePath       -- ^ Path to the output directory

  , optSaveCluster :: Maybe FilePath -- ^ Save cluster state to this file

  , optShowCmds    :: Maybe FilePath -- ^ Whether to show the command list

  , optShowHelp    :: Bool           -- ^ Just show the help

  , optShowInsts   :: Bool           -- ^ Whether to show the instance map

  , optShowNodes   :: Maybe [String] -- ^ Whether to show node status

  , optShowVer     :: Bool           -- ^ Just show the program version

  , optStdSpec     :: Maybe RSpec    -- ^ Requested standard specs

  , optTieredSpec  :: Maybe RSpec    -- ^ Requested specs for tiered mode

  , optReplay      :: Maybe String   -- ^ Unittests: RNG state

  , optVerbose     :: Int            -- ^ Verbosity level

  } deriving Show

-- | Default values for the command line options.

defaultOptions :: Options

defaultOptions  = Options

  { optDataFile    = Nothing

  , optDiskMoves   = True

  , optInstMoves   = True

  , optDiskTemplate = Nothing

  , optDynuFile    = Nothing

  , optEvacMode    = False

  , optExInst      = []

  , optExTags      = Nothing

  , optExecJobs    = False

  , optGroup       = Nothing

  , optSelInst     = []

  , optLuxi        = Nothing

  , optMachineReadable = False

  , optMaster      = ""

  , optMaxLength   = -1

  , optMcpu        = defVcpuRatio

  , optMdsk        = defReservedDiskRatio

  , optMinGain     = 1e-2

  , optMinGainLim  = 1e-1

  , optMinScore    = 1e-9

  , optNoHeaders   = False

  , optNodeSim     = []

  , optOffline     = []

  , optOutPath     = "."

  , optSaveCluster = Nothing

  , optShowCmds    = Nothing

  , optShowHelp    = False

  , optShowInsts   = False

  , optShowNodes   = Nothing

  , optShowVer     = False

  , optStdSpec     = Nothing

  , optTieredSpec  = Nothing

  , optReplay      = Nothing

  , optVerbose     = 1

  }

-- | Abrreviation for the option type.

type OptType = OptDescr (Options -> Result Options)

-- * Helper functions

parseISpecString :: String -> String -> Result RSpec

parseISpecString descr inp = do

  let sp = sepSplit ',' inp

      err = Bad ("Invalid " ++ descr ++ " specification: '" ++ inp ++

                 "', expected disk,ram,cpu")

  when (length sp /= 3) err

  prs <- mapM (\(fn, val) -> fn val) $

         zip [ annotateResult (descr ++ " specs disk") . parseUnit

             , annotateResult (descr ++ " specs memory") . parseUnit

             , tryRead (descr ++ " specs cpus")

             ] sp

  case prs of

    [dsk, ram, cpu] -> return $ RSpec cpu ram dsk

    _ -> err

-- * Command line options

oDataFile :: OptType

oDataFile = Option "t" ["text-data"]

            (ReqArg (\ f o -> Ok o { optDataFile = Just f }) "FILE")

            "the cluster data FILE"

oDiskMoves :: OptType

oDiskMoves = Option "" ["no-disk-moves"]

             (NoArg (\ opts -> Ok opts { optDiskMoves = False}))

             "disallow disk moves from the list of allowed instance changes,\

             \ thus allowing only the 'cheap' failover/migrate operations"

oDiskTemplate :: OptType

oDiskTemplate = Option "" ["disk-template"]

                (ReqArg (\ t opts -> do

                           dt <- diskTemplateFromRaw t

                           return $ opts { optDiskTemplate = Just dt })

                 "TEMPLATE") "select the desired disk template"

oSelInst :: OptType

oSelInst = Option "" ["select-instances"]

          (ReqArg (\ f opts -> Ok opts { optSelInst = sepSplit ',' f }) "INSTS")

          "only select given instances for any moves"

oInstMoves :: OptType

oInstMoves = Option "" ["no-instance-moves"]

             (NoArg (\ opts -> Ok opts { optInstMoves = False}))

             "disallow instance (primary node) moves from the list of allowed,\

             \ instance changes, thus allowing only slower, but sometimes\

             \ safer, drbd secondary changes"

oDynuFile :: OptType

oDynuFile = Option "U" ["dynu-file"]

            (ReqArg (\ f opts -> Ok opts { optDynuFile = Just f }) "FILE")

            "Import dynamic utilisation data from the given FILE"

oEvacMode :: OptType

oEvacMode = Option "E" ["evac-mode"]

            (NoArg (\opts -> Ok opts { optEvacMode = True }))

            "enable evacuation mode, where the algorithm only moves \

            \ instances away from offline and drained nodes"

oExInst :: OptType

oExInst = Option "" ["exclude-instances"]

          (ReqArg (\ f opts -> Ok opts { optExInst = sepSplit ',' f }) "INSTS")

          "exclude given instances from any moves"

oExTags :: OptType

oExTags = Option "" ["exclusion-tags"]

            (ReqArg (\ f opts -> Ok opts { optExTags = Just $ sepSplit ',' f })

             "TAG,...") "Enable instance exclusion based on given tag prefix"

oExecJobs :: OptType

oExecJobs = Option "X" ["exec"]

             (NoArg (\ opts -> Ok opts { optExecJobs = True}))

             "execute the suggested moves via Luxi (only available when using\

             \ it for data gathering)"

oGroup :: OptType

oGroup = Option "G" ["group"]

            (ReqArg (\ f o -> Ok o { optGroup = Just f }) "ID")

            "the ID of the group to balance"

oLuxiSocket :: OptType

oLuxiSocket = Option "L" ["luxi"]

              (OptArg ((\ f opts -> Ok opts { optLuxi = Just f }) .

                       fromMaybe defaultLuxiSocket) "SOCKET")

              "collect data via Luxi, optionally using the given SOCKET path"

oMachineReadable :: OptType

oMachineReadable = Option "" ["machine-readable"]

                   (OptArg (\ f opts -> do

                     flag <- parseYesNo True f

                     return $ opts { optMachineReadable = flag }) "CHOICE")

          "enable machine readable output (pass either 'yes' or 'no' to\

          \ explicitely control the flag, or without an argument defaults to\

          \ yes"

oMaxCpu :: OptType

oMaxCpu = Option "" ["max-cpu"]

          (ReqArg (\ n opts -> Ok opts { optMcpu = read n }) "RATIO")

          "maximum virtual-to-physical cpu ratio for nodes (from 1\

          \ upwards) [64]"

oMaxSolLength :: OptType

oMaxSolLength = Option "l" ["max-length"]

                (ReqArg (\ i opts -> Ok opts { optMaxLength = read i }) "N")

                "cap the solution at this many balancing or allocation \

                \ rounds (useful for very unbalanced clusters or empty \

                \ clusters)"

oMinDisk :: OptType

oMinDisk = Option "" ["min-disk"]

           (ReqArg (\ n opts -> Ok opts { optMdsk = read n }) "RATIO")

           "minimum free disk space for nodes (between 0 and 1) [0]"

oMinGain :: OptType

oMinGain = Option "g" ["min-gain"]

            (ReqArg (\ g opts -> Ok opts { optMinGain = read g }) "DELTA")

            "minimum gain to aim for in a balancing step before giving up"

oMinGainLim :: OptType

oMinGainLim = Option "" ["min-gain-limit"]

            (ReqArg (\ g opts -> Ok opts { optMinGainLim = read g }) "SCORE")

            "minimum cluster score for which we start checking the min-gain"

oMinScore :: OptType

oMinScore = Option "e" ["min-score"]

            (ReqArg (\ e opts -> Ok opts { optMinScore = read e }) "EPSILON")

            "mininum score to aim for"

oNoHeaders :: OptType

oNoHeaders = Option "" ["no-headers"]

             (NoArg (\ opts -> Ok opts { optNoHeaders = True }))

             "do not show a header line"

oNodeSim :: OptType

oNodeSim = Option "" ["simulate"]

            (ReqArg (\ f o -> Ok o { optNodeSim = f:optNodeSim o }) "SPEC")

            "simulate an empty cluster, given as 'num_nodes,disk,ram,cpu'"

oOfflineNode :: OptType

oOfflineNode = Option "O" ["offline"]

               (ReqArg (\ n o -> Ok o { optOffline = n:optOffline o }) "NODE")

               "set node as offline"

oOutputDir :: OptType

oOutputDir = Option "d" ["output-dir"]

             (ReqArg (\ d opts -> Ok opts { optOutPath = d }) "PATH")

             "directory in which to write output files"

oPrintCommands :: OptType

oPrintCommands = Option "C" ["print-commands"]

                 (OptArg ((\ f opts -> Ok opts { optShowCmds = Just f }) .

                          fromMaybe "-")

                  "FILE")

                 "print the ganeti command list for reaching the solution,\

                 \ if an argument is passed then write the commands to a\

                 \ file named as such"

oPrintInsts :: OptType

oPrintInsts = Option "" ["print-instances"]

              (NoArg (\ opts -> Ok opts { optShowInsts = True }))

              "print the final instance map"

oPrintNodes :: OptType

oPrintNodes = Option "p" ["print-nodes"]

              (OptArg ((\ f opts ->

                          let (prefix, realf) = case f of

                                                  '+':rest -> (["+"], rest)

                                                  _ -> ([], f)

                              splitted = prefix ++ sepSplit ',' realf

                          in Ok opts { optShowNodes = Just splitted }) .

                       fromMaybe []) "FIELDS")

              "print the final node list"

oQuiet :: OptType

oQuiet = Option "q" ["quiet"]

         (NoArg (\ opts -> Ok opts { optVerbose = optVerbose opts - 1 }))

         "decrease the verbosity level"

oRapiMaster :: OptType

oRapiMaster = Option "m" ["master"]

              (ReqArg (\ m opts -> Ok opts { optMaster = m }) "ADDRESS")

              "collect data via RAPI at the given ADDRESS"

oSaveCluster :: OptType

oSaveCluster = Option "S" ["save"]

            (ReqArg (\ f opts -> Ok opts { optSaveCluster = Just f }) "FILE")

            "Save cluster state at the end of the processing to FILE"

oShowHelp :: OptType

oShowHelp = Option "h" ["help"]

            (NoArg (\ opts -> Ok opts { optShowHelp = True}))

            "show help"

oShowVer :: OptType

oShowVer = Option "V" ["version"]

           (NoArg (\ opts -> Ok opts { optShowVer = True}))

           "show the version of the program"

oStdSpec :: OptType

oStdSpec = Option "" ["standard-alloc"]

             (ReqArg (\ inp opts -> do

                        tspec <- parseISpecString "standard" inp

                        return $ opts { optStdSpec = Just tspec } )

              "STDSPEC")

             "enable standard specs allocation, given as 'disk,ram,cpu'"

oTieredSpec :: OptType

oTieredSpec = Option "" ["tiered-alloc"]

             (ReqArg (\ inp opts -> do

                        tspec <- parseISpecString "tiered" inp

                        return $ opts { optTieredSpec = Just tspec } )

              "TSPEC")

             "enable tiered specs allocation, given as 'disk,ram,cpu'"

oReplay :: OptType

oReplay = Option "" ["replay"]

          (ReqArg (\ stat opts -> Ok opts { optReplay = Just stat } ) "STATE")

          "Pre-seed the random number generator with STATE"

oVerbose :: OptType

oVerbose = Option "v" ["verbose"]

           (NoArg (\ opts -> Ok opts { optVerbose = optVerbose opts + 1 }))

           "increase the verbosity level"

-- * Functions

-- | Helper for parsing a yes\/no command line flag.

parseYesNo :: Bool         -- ^ Default value (when we get a @Nothing@)

           -> Maybe String -- ^ Parameter value

           -> Result Bool  -- ^ Resulting boolean value

parseYesNo v Nothing      = return v

parseYesNo _ (Just "yes") = return True

parseYesNo _ (Just "no")  = return False

parseYesNo _ (Just s)     = fail ("Invalid choice '" ++ s ++

                                  "', pass one of 'yes' or 'no'")

-- | Usage info.

usageHelp :: String -> [OptType] -> String

usageHelp progname =

  usageInfo (printf "%s %s\nUsage: %s [OPTION...]"

             progname Version.version progname)

-- | Show the program version info.

versionInfo :: String -> String

versionInfo progname =

  printf "%s %s\ncompiled with %s %s\nrunning on %s %s\n"

         progname Version.version compilerName

         (Data.Version.showVersion compilerVersion)

         os arch

-- | Command line parser, using the 'Options' structure.

parseOpts :: [String]               -- ^ The command line arguments

          -> String                 -- ^ The program name

          -> [OptType]              -- ^ The supported command line options

          -> IO (Options, [String]) -- ^ The resulting options and leftover

                                    -- arguments

parseOpts argv progname options =

  case parseOptsInner argv progname options of

    Left (code, msg) -> do

      hPutStr (if code == 0 then stdout else stderr) msg

      exitWith (if code == 0 then ExitSuccess else ExitFailure code)

    Right result ->

      return result

-- | Inner parse options. The arguments are similar to 'parseOpts',

-- but it returns either a 'Left' composed of exit code and message,

-- or a 'Right' for the success case.

parseOptsInner :: [String] -> String -> [OptType]

               -> Either (Int, String) (Options, [String])

parseOptsInner argv progname options =

  case getOpt Permute options argv of

    (o, n, []) ->

      let (pr, args) = (foldM (flip id) defaultOptions o, n)

      in case pr of

           Bad msg -> Left (1, "Error while parsing command\

                               \line arguments:\n" ++ msg ++ "\n")

           Ok po ->

             select (Right (po, args))

                 [ (optShowHelp po, Left (0, usageHelp progname options))

                 , (optShowVer po,  Left (0, versionInfo progname))

                 ]

    (_, _, errs) ->

      Left (2, "Command line error: "  ++ concat errs ++ "\n" ++

            usageHelp progname options)

-- | A shell script template for autogenerated scripts.

shTemplate :: String

shTemplate =

  printf "#!/bin/sh\n\n\

         \# Auto-generated script for executing cluster rebalancing\n\n\

         \# To stop, touch the file /tmp/stop-htools\n\n\

         \set -e\n\n\

         \check() {\n\

         \  if [ -f /tmp/stop-htools ]; then\n\

         \    echo 'Stop requested, exiting'\n\

         \    exit 0\n\

         \  fi\n\

         \}\n\n"

-- | Optionally print the node list.

maybePrintNodes :: Maybe [String]       -- ^ The field list

                -> String               -- ^ Informational message

                -> ([String] -> String) -- ^ Function to generate the listing

                -> IO ()

maybePrintNodes Nothing _ _ = return ()

maybePrintNodes (Just fields) msg fn = do

  hPutStrLn stderr ""

  hPutStrLn stderr (msg ++ " status:")

  hPutStrLn stderr $ fn fields

-- | Optionally print the instance list.

maybePrintInsts :: Bool   -- ^ Whether to print the instance list

                -> String -- ^ Type of the instance map (e.g. initial)

                -> String -- ^ The instance data

                -> IO ()

maybePrintInsts do_print msg instdata =

  when do_print $ do

    hPutStrLn stderr ""

    hPutStrLn stderr $ msg ++ " instance map:"

    hPutStr stderr instdata

-- | Function to display warning messages from parsing the cluster

-- state.

maybeShowWarnings :: [String] -- ^ The warning messages

                  -> IO ()

maybeShowWarnings fix_msgs =

  unless (null fix_msgs) $ do

    hPutStrLn stderr "Warning: cluster has inconsistent data:"

    hPutStrLn stderr . unlines . map (printf "  - %s") $ fix_msgs

-- | Set node properties based on command line options.

setNodeStatus :: Options -> Node.List -> IO Node.List

setNodeStatus opts fixed_nl = do

  let offline_passed = optOffline opts

      all_nodes = Container.elems fixed_nl

      offline_lkp = map (lookupName (map Node.name all_nodes)) offline_passed

      offline_wrong = filter (not . goodLookupResult) offline_lkp

      offline_names = map lrContent offline_lkp

      offline_indices = map Node.idx $

                        filter (\n -> Node.name n `elem` offline_names)

                               all_nodes

      m_cpu = optMcpu opts

      m_dsk = optMdsk opts

  unless (null offline_wrong) $ do

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

                     (commaJoin (map lrContent offline_wrong)) :: 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

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

            nm

  return nlf