Synnefo » snf-ganeti » ganeti-local

{-# LANGUAGE TemplateHaskell #-}

{-| Unittests for ganeti-htools.

-}

{-

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.QC

  ( testUtils

  , testPeerMap

  , testContainer

  , testInstance

  , testNode

  , testText

  , testSimu

  , testOpCodes

  , testJobs

  , testCluster

  , testLoader

  , testTypes

  ) where

import Test.QuickCheck

import Text.Printf (printf)

import Data.List (findIndex, intercalate, nub, isPrefixOf)

import qualified Data.Set as Set

import Data.Maybe

import Control.Monad

import qualified Text.JSON as J

import qualified Data.Map

import qualified Data.IntMap as IntMap

import qualified Ganeti.OpCodes as OpCodes

import qualified Ganeti.Jobs as Jobs

import qualified Ganeti.Luxi

import qualified Ganeti.HTools.CLI as CLI

import qualified Ganeti.HTools.Cluster as Cluster

import qualified Ganeti.HTools.Container as Container

import qualified Ganeti.HTools.ExtLoader

import qualified Ganeti.HTools.IAlloc as IAlloc

import qualified Ganeti.HTools.Instance as Instance

import qualified Ganeti.HTools.JSON as JSON

import qualified Ganeti.HTools.Loader as Loader

import qualified Ganeti.HTools.Luxi

import qualified Ganeti.HTools.Node as Node

import qualified Ganeti.HTools.Group as Group

import qualified Ganeti.HTools.PeerMap as PeerMap

import qualified Ganeti.HTools.Rapi

import qualified Ganeti.HTools.Simu as Simu

import qualified Ganeti.HTools.Text as Text

import qualified Ganeti.HTools.Types as Types

import qualified Ganeti.HTools.Utils as Utils

import qualified Ganeti.HTools.Version

import qualified Ganeti.Constants as C

import qualified Ganeti.HTools.Program.Hail

import qualified Ganeti.HTools.Program.Hbal

import qualified Ganeti.HTools.Program.Hscan

import qualified Ganeti.HTools.Program.Hspace

import Ganeti.HTools.QCHelper (testSuite)

-- * Constants

-- | Maximum memory (1TiB, somewhat random value).

maxMem :: Int

maxMem = 1024 * 1024

-- | Maximum disk (8TiB, somewhat random value).

maxDsk :: Int

maxDsk = 1024 * 1024 * 8

-- | Max CPUs (1024, somewhat random value).

maxCpu :: Int

maxCpu = 1024

-- | All disk templates (used later)

allDiskTemplates :: [Types.DiskTemplate]

allDiskTemplates = [minBound..maxBound]

-- | Null iPolicy, and by null we mean very liberal.

nullIPolicy = Types.IPolicy

  { Types.iPolicyMinSpec = Types.ISpec { Types.iSpecMemorySize = 0

                                       , Types.iSpecCpuCount   = 0

                                       , Types.iSpecDiskSize   = 0

                                       , Types.iSpecDiskCount  = 0

                                       , Types.iSpecNicCount   = 0

                                       }

  , Types.iPolicyMaxSpec = Types.ISpec { Types.iSpecMemorySize = maxBound

                                       , Types.iSpecCpuCount   = maxBound

                                       , Types.iSpecDiskSize   = maxBound

                                       , Types.iSpecDiskCount  = C.maxDisks

                                       , Types.iSpecNicCount   = C.maxNics

                                       }

  , Types.iPolicyStdSpec = Types.ISpec { Types.iSpecMemorySize = Types.unitMem

                                       , Types.iSpecCpuCount   = Types.unitCpu

                                       , Types.iSpecDiskSize   = Types.unitDsk

                                       , Types.iSpecDiskCount  = 1

                                       , Types.iSpecNicCount   = 1

                                       }

  , Types.iPolicyDiskTemplates = [Types.DTDrbd8, Types.DTPlain]

  }

defGroup :: Group.Group

defGroup = flip Group.setIdx 0 $

             Group.create "default" Types.defaultGroupID Types.AllocPreferred

                  nullIPolicy

defGroupList :: Group.List

defGroupList = Container.fromList [(Group.idx defGroup, defGroup)]

defGroupAssoc :: Data.Map.Map String Types.Gdx

defGroupAssoc = Data.Map.singleton (Group.uuid defGroup) (Group.idx defGroup)

-- * Helper functions

-- | Simple checker for whether OpResult is fail or pass.

isFailure :: Types.OpResult a -> Bool

isFailure (Types.OpFail _) = True

isFailure _ = False

-- | Checks for equality with proper annotation.

(==?) :: (Show a, Eq a) => a -> a -> Property

(==?) x y = printTestCase

            ("Expected equality, but '" ++

             show x ++ "' /= '" ++ show y ++ "'") (x == y)

infix 3 ==?

-- | Show a message and fail the test.

failTest :: String -> Property

failTest msg = printTestCase msg False

-- | Update an instance to be smaller than a node.

setInstanceSmallerThanNode node inst =

  inst { Instance.mem = Node.availMem node `div` 2

       , Instance.dsk = Node.availDisk node `div` 2

       , Instance.vcpus = Node.availCpu node `div` 2

       }

-- | Create an instance given its spec.

createInstance mem dsk vcpus =

  Instance.create "inst-unnamed" mem dsk vcpus Types.Running [] True (-1) (-1)

    Types.DTDrbd8

-- | Create a small cluster by repeating a node spec.

makeSmallCluster :: Node.Node -> Int -> Node.List

makeSmallCluster node count =

  let origname = Node.name node

      origalias = Node.alias node

      nodes = map (\idx -> node { Node.name = origname ++ "-" ++ show idx

                                , Node.alias = origalias ++ "-" ++ show idx })

              [1..count]

      fn = flip Node.buildPeers Container.empty

      namelst = map (\n -> (Node.name n, fn n)) nodes

      (_, nlst) = Loader.assignIndices namelst

  in nlst

-- | Make a small cluster, both nodes and instances.

makeSmallEmptyCluster :: Node.Node -> Int -> Instance.Instance

                      -> (Node.List, Instance.List, Instance.Instance)

makeSmallEmptyCluster node count inst =

  (makeSmallCluster node count, Container.empty,

   setInstanceSmallerThanNode node inst)

-- | Checks if a node is "big" enough.

isNodeBig :: Int -> Node.Node -> Bool

isNodeBig size node = Node.availDisk node > size * Types.unitDsk

                      && Node.availMem node > size * Types.unitMem

                      && Node.availCpu node > size * Types.unitCpu

canBalance :: Cluster.Table -> Bool -> Bool -> Bool -> Bool

canBalance tbl dm im evac = isJust $ Cluster.tryBalance tbl dm im evac 0 0

-- | Assigns a new fresh instance to a cluster; this is not

-- allocation, so no resource checks are done.

assignInstance :: Node.List -> Instance.List -> Instance.Instance ->

                  Types.Idx -> Types.Idx ->

                  (Node.List, Instance.List)

assignInstance nl il inst pdx sdx =

  let pnode = Container.find pdx nl

      snode = Container.find sdx nl

      maxiidx = if Container.null il

                  then 0

                  else fst (Container.findMax il) + 1

      inst' = inst { Instance.idx = maxiidx,

                     Instance.pNode = pdx, Instance.sNode = sdx }

      pnode' = Node.setPri pnode inst'

      snode' = Node.setSec snode inst'

      nl' = Container.addTwo pdx pnode' sdx snode' nl

      il' = Container.add maxiidx inst' il

  in (nl', il')

-- | Generates a list of a given size with non-duplicate elements.

genUniquesList :: (Eq a, Arbitrary a) => Int -> Gen [a]

genUniquesList cnt =

  foldM (\lst _ -> do

           newelem <- arbitrary `suchThat` (`notElem` lst)

           return (newelem:lst)) [] [1..cnt]

-- * Arbitrary instances

-- | Defines a DNS name.

newtype DNSChar = DNSChar { dnsGetChar::Char }

instance Arbitrary DNSChar where

  arbitrary = do

    x <- elements (['a'..'z'] ++ ['0'..'9'] ++ "_-")

    return (DNSChar x)

-- | Generates a single name component.

getName :: Gen String

getName = do

  n <- choose (1, 64)

  dn <- vector n::Gen [DNSChar]

  return (map dnsGetChar dn)

-- | Generates an entire FQDN.

getFQDN :: Gen String

getFQDN = do

  ncomps <- choose (1, 4)

  names <- mapM (const getName) [1..ncomps::Int]

  return $ intercalate "." names

-- | Defines a tag type.

newtype TagChar = TagChar { tagGetChar :: Char }

-- | All valid tag chars. This doesn't need to match _exactly_

-- Ganeti's own tag regex, just enough for it to be close.

tagChar :: [Char]

tagChar = ['a'..'z'] ++ ['A'..'Z'] ++ ['0'..'9'] ++ ".+*/:@-"

instance Arbitrary TagChar where

  arbitrary = do

    c <- elements tagChar

    return (TagChar c)

-- | Generates a tag

genTag :: Gen [TagChar]

genTag = do

  -- the correct value would be C.maxTagLen, but that's way too

  -- verbose in unittests, and at the moment I don't see any possible

  -- bugs with longer tags and the way we use tags in htools

  n <- choose (1, 10)

  vector n

-- | Generates a list of tags (correctly upper bounded).

genTags :: Gen [String]

genTags = do

  -- the correct value would be C.maxTagsPerObj, but per the comment

  -- in genTag, we don't use tags enough in htools to warrant testing

  -- such big values

  n <- choose (0, 10::Int)

  tags <- mapM (const genTag) [1..n]

  return $ map (map tagGetChar) tags

instance Arbitrary Types.InstanceStatus where

    arbitrary = elements [minBound..maxBound]

-- | Generates a random instance with maximum disk/mem/cpu values.

genInstanceSmallerThan :: Int -> Int -> Int -> Gen Instance.Instance

genInstanceSmallerThan lim_mem lim_dsk lim_cpu = do

  name <- getFQDN

  mem <- choose (0, lim_mem)

  dsk <- choose (0, lim_dsk)

  run_st <- arbitrary

  pn <- arbitrary

  sn <- arbitrary

  vcpus <- choose (0, lim_cpu)

  return $ Instance.create name mem dsk vcpus run_st [] True pn sn

         Types.DTDrbd8

-- | Generates an instance smaller than a node.

genInstanceSmallerThanNode :: Node.Node -> Gen Instance.Instance

genInstanceSmallerThanNode node =

  genInstanceSmallerThan (Node.availMem node `div` 2)

                         (Node.availDisk node `div` 2)

                         (Node.availCpu node `div` 2)

-- let's generate a random instance

instance Arbitrary Instance.Instance where

  arbitrary = genInstanceSmallerThan maxMem maxDsk maxCpu

-- | Generas an arbitrary node based on sizing information.

genNode :: Maybe Int -- ^ Minimum node size in terms of units

        -> Maybe Int -- ^ Maximum node size (when Nothing, bounded

                     -- just by the max... constants)

        -> Gen Node.Node

genNode min_multiplier max_multiplier = do

  let (base_mem, base_dsk, base_cpu) =

        case min_multiplier of

          Just mm -> (mm * Types.unitMem,

                      mm * Types.unitDsk,

                      mm * Types.unitCpu)

          Nothing -> (0, 0, 0)

      (top_mem, top_dsk, top_cpu)  =

        case max_multiplier of

          Just mm -> (mm * Types.unitMem,

                      mm * Types.unitDsk,

                      mm * Types.unitCpu)

          Nothing -> (maxMem, maxDsk, maxCpu)

  name  <- getFQDN

  mem_t <- choose (base_mem, top_mem)

  mem_f <- choose (base_mem, mem_t)

  mem_n <- choose (0, mem_t - mem_f)

  dsk_t <- choose (base_dsk, top_dsk)

  dsk_f <- choose (base_dsk, dsk_t)

  cpu_t <- choose (base_cpu, top_cpu)

  offl  <- arbitrary

  let n = Node.create name (fromIntegral mem_t) mem_n mem_f

          (fromIntegral dsk_t) dsk_f (fromIntegral cpu_t) offl 0

      n' = Node.setPolicy nullIPolicy n

  return $ Node.buildPeers n' Container.empty

-- | Helper function to generate a sane node.

genOnlineNode :: Gen Node.Node

genOnlineNode = do

  arbitrary `suchThat` (\n -> not (Node.offline n) &&

                              not (Node.failN1 n) &&

                              Node.availDisk n > 0 &&

                              Node.availMem n > 0 &&

                              Node.availCpu n > 0)

-- and a random node

instance Arbitrary Node.Node where

  arbitrary = genNode Nothing Nothing

-- replace disks

instance Arbitrary OpCodes.ReplaceDisksMode where

  arbitrary = elements [minBound..maxBound]

instance Arbitrary OpCodes.OpCode where

  arbitrary = do

    op_id <- elements [ "OP_TEST_DELAY"

                      , "OP_INSTANCE_REPLACE_DISKS"

                      , "OP_INSTANCE_FAILOVER"

                      , "OP_INSTANCE_MIGRATE"

                      ]

    case op_id of

      "OP_TEST_DELAY" ->

        liftM3 OpCodes.OpTestDelay arbitrary arbitrary arbitrary

      "OP_INSTANCE_REPLACE_DISKS" ->

        liftM5 OpCodes.OpInstanceReplaceDisks arbitrary arbitrary

          arbitrary arbitrary arbitrary

      "OP_INSTANCE_FAILOVER" ->

        liftM3 OpCodes.OpInstanceFailover arbitrary arbitrary

          arbitrary

      "OP_INSTANCE_MIGRATE" ->

        liftM5 OpCodes.OpInstanceMigrate arbitrary arbitrary

          arbitrary arbitrary arbitrary

      _ -> fail "Wrong opcode"

instance Arbitrary Jobs.OpStatus where

  arbitrary = elements [minBound..maxBound]

instance Arbitrary Jobs.JobStatus where

  arbitrary = elements [minBound..maxBound]

newtype SmallRatio = SmallRatio Double deriving Show

instance Arbitrary SmallRatio where

  arbitrary = do

    v <- choose (0, 1)

    return $ SmallRatio v

instance Arbitrary Types.AllocPolicy where

  arbitrary = elements [minBound..maxBound]

instance Arbitrary Types.DiskTemplate where

  arbitrary = elements [minBound..maxBound]

instance Arbitrary Types.FailMode where

  arbitrary = elements [minBound..maxBound]

instance Arbitrary Types.EvacMode where

  arbitrary = elements [minBound..maxBound]

instance Arbitrary a => Arbitrary (Types.OpResult a) where

  arbitrary = arbitrary >>= \c ->

              if c

                then liftM Types.OpGood arbitrary

                else liftM Types.OpFail arbitrary

instance Arbitrary Types.ISpec where

  arbitrary = do

    mem_s <- arbitrary::Gen (NonNegative Int)

    dsk_c <- arbitrary::Gen (NonNegative Int)

    dsk_s <- arbitrary::Gen (NonNegative Int)

    cpu_c <- arbitrary::Gen (NonNegative Int)

    nic_c <- arbitrary::Gen (NonNegative Int)

    return Types.ISpec { Types.iSpecMemorySize = fromIntegral mem_s

                       , Types.iSpecCpuCount   = fromIntegral cpu_c

                       , Types.iSpecDiskSize   = fromIntegral dsk_s

                       , Types.iSpecDiskCount  = fromIntegral dsk_c

                       , Types.iSpecNicCount   = fromIntegral nic_c

                       }

-- | Generates an ispec bigger than the given one.

genBiggerISpec :: Types.ISpec -> Gen Types.ISpec

genBiggerISpec imin = do

  mem_s <- choose (Types.iSpecMemorySize imin, maxBound)

  dsk_c <- choose (Types.iSpecDiskCount imin, maxBound)

  dsk_s <- choose (Types.iSpecDiskSize imin, maxBound)

  cpu_c <- choose (Types.iSpecCpuCount imin, maxBound)

  nic_c <- choose (Types.iSpecNicCount imin, maxBound)

  return Types.ISpec { Types.iSpecMemorySize = fromIntegral mem_s

                     , Types.iSpecCpuCount   = fromIntegral cpu_c

                     , Types.iSpecDiskSize   = fromIntegral dsk_s

                     , Types.iSpecDiskCount  = fromIntegral dsk_c

                     , Types.iSpecNicCount   = fromIntegral nic_c

                     }

instance Arbitrary Types.IPolicy where

  arbitrary = do

    imin <- arbitrary

    istd <- genBiggerISpec imin

    imax <- genBiggerISpec istd

    num_tmpl <- choose (0, length allDiskTemplates)

    dts  <- genUniquesList num_tmpl

    return Types.IPolicy { Types.iPolicyMinSpec = imin

                         , Types.iPolicyStdSpec = istd

                         , Types.iPolicyMaxSpec = imax

                         , Types.iPolicyDiskTemplates = dts

                         }

-- * Actual tests

-- ** Utils tests

-- | If the list is not just an empty element, and if the elements do

-- not contain commas, then join+split should be idempotent.

prop_Utils_commaJoinSplit =

  forAll (arbitrary `suchThat`

          (\l -> l /= [""] && all (notElem ',') l )) $ \lst ->

  Utils.sepSplit ',' (Utils.commaJoin lst) ==? lst

-- | Split and join should always be idempotent.

prop_Utils_commaSplitJoin s =

  Utils.commaJoin (Utils.sepSplit ',' s) ==? s

-- | fromObjWithDefault, we test using the Maybe monad and an integer

-- value.

prop_Utils_fromObjWithDefault def_value random_key =

  -- a missing key will be returned with the default

  JSON.fromObjWithDefault [] random_key def_value == Just def_value &&

  -- a found key will be returned as is, not with default

  JSON.fromObjWithDefault [(random_key, J.showJSON def_value)]

       random_key (def_value+1) == Just def_value

    where _types = def_value :: Integer

-- | Test that functional if' behaves like the syntactic sugar if.

prop_Utils_if'if :: Bool -> Int -> Int -> Gen Prop

prop_Utils_if'if cnd a b =

  Utils.if' cnd a b ==? if cnd then a else b

-- | Test basic select functionality

prop_Utils_select :: Int      -- ^ Default result

                  -> [Int]    -- ^ List of False values

                  -> [Int]    -- ^ List of True values

                  -> Gen Prop -- ^ Test result

prop_Utils_select def lst1 lst2 =

  Utils.select def (flist ++ tlist) ==? expectedresult

    where expectedresult = Utils.if' (null lst2) def (head lst2)

          flist = zip (repeat False) lst1

          tlist = zip (repeat True)  lst2

-- | Test basic select functionality with undefined default

prop_Utils_select_undefd :: [Int]            -- ^ List of False values

                         -> NonEmptyList Int -- ^ List of True values

                         -> Gen Prop         -- ^ Test result

prop_Utils_select_undefd lst1 (NonEmpty lst2) =

  Utils.select undefined (flist ++ tlist) ==? head lst2

    where flist = zip (repeat False) lst1

          tlist = zip (repeat True)  lst2

-- | Test basic select functionality with undefined list values

prop_Utils_select_undefv :: [Int]            -- ^ List of False values

                         -> NonEmptyList Int -- ^ List of True values

                         -> Gen Prop         -- ^ Test result

prop_Utils_select_undefv lst1 (NonEmpty lst2) =

  Utils.select undefined cndlist ==? head lst2

    where flist = zip (repeat False) lst1

          tlist = zip (repeat True)  lst2

          cndlist = flist ++ tlist ++ [undefined]

prop_Utils_parseUnit (NonNegative n) =

  Utils.parseUnit (show n) == Types.Ok n &&

  Utils.parseUnit (show n ++ "m") == Types.Ok n &&

  (case Utils.parseUnit (show n ++ "M") of

     Types.Ok m -> if n > 0

                     then m < n  -- for positive values, X MB is < than X MiB

                     else m == 0 -- but for 0, 0 MB == 0 MiB

     Types.Bad _ -> False) &&

  Utils.parseUnit (show n ++ "g") == Types.Ok (n*1024) &&

  Utils.parseUnit (show n ++ "t") == Types.Ok (n*1048576) &&

  Types.isBad (Utils.parseUnit (show n ++ "x")::Types.Result Int)

    where _types = n::Int

-- | Test list for the Utils module.

testSuite "Utils"

            [ 'prop_Utils_commaJoinSplit

            , 'prop_Utils_commaSplitJoin

            , 'prop_Utils_fromObjWithDefault

            , 'prop_Utils_if'if

            , 'prop_Utils_select

            , 'prop_Utils_select_undefd

            , 'prop_Utils_select_undefv

            , 'prop_Utils_parseUnit

            ]

-- ** PeerMap tests

-- | Make sure add is idempotent.

prop_PeerMap_addIdempotent pmap key em =

  fn puniq ==? fn (fn puniq)

    where _types = (pmap::PeerMap.PeerMap,

                    key::PeerMap.Key, em::PeerMap.Elem)

          fn = PeerMap.add key em

          puniq = PeerMap.accumArray const pmap

-- | Make sure remove is idempotent.

prop_PeerMap_removeIdempotent pmap key =

  fn puniq ==? fn (fn puniq)

    where _types = (pmap::PeerMap.PeerMap, key::PeerMap.Key)

          fn = PeerMap.remove key

          puniq = PeerMap.accumArray const pmap

-- | Make sure a missing item returns 0.

prop_PeerMap_findMissing pmap key =

  PeerMap.find key (PeerMap.remove key puniq) ==? 0

    where _types = (pmap::PeerMap.PeerMap, key::PeerMap.Key)

          puniq = PeerMap.accumArray const pmap

-- | Make sure an added item is found.

prop_PeerMap_addFind pmap key em =

  PeerMap.find key (PeerMap.add key em puniq) ==? em

    where _types = (pmap::PeerMap.PeerMap,

                    key::PeerMap.Key, em::PeerMap.Elem)

          puniq = PeerMap.accumArray const pmap

-- | Manual check that maxElem returns the maximum indeed, or 0 for null.

prop_PeerMap_maxElem pmap =

  PeerMap.maxElem puniq ==? if null puniq then 0

                              else (maximum . snd . unzip) puniq

    where _types = pmap::PeerMap.PeerMap

          puniq = PeerMap.accumArray const pmap

-- | List of tests for the PeerMap module.

testSuite "PeerMap"

            [ 'prop_PeerMap_addIdempotent

            , 'prop_PeerMap_removeIdempotent

            , 'prop_PeerMap_maxElem

            , 'prop_PeerMap_addFind

            , 'prop_PeerMap_findMissing

            ]

-- ** Container tests

-- we silence the following due to hlint bug fixed in later versions

{-# ANN prop_Container_addTwo "HLint: ignore Avoid lambda" #-}

prop_Container_addTwo cdata i1 i2 =

  fn i1 i2 cont == fn i2 i1 cont &&

  fn i1 i2 cont == fn i1 i2 (fn i1 i2 cont)

    where _types = (cdata::[Int],

                    i1::Int, i2::Int)

          cont = foldl (\c x -> Container.add x x c) Container.empty cdata

          fn x1 x2 = Container.addTwo x1 x1 x2 x2

prop_Container_nameOf node =

  let nl = makeSmallCluster node 1

      fnode = head (Container.elems nl)

  in Container.nameOf nl (Node.idx fnode) ==? Node.name fnode

-- | We test that in a cluster, given a random node, we can find it by

-- its name and alias, as long as all names and aliases are unique,

-- and that we fail to find a non-existing name.

prop_Container_findByName node =

  forAll (choose (1, 20)) $ \ cnt ->

  forAll (choose (0, cnt - 1)) $ \ fidx ->

  forAll (genUniquesList (cnt * 2)) $ \ allnames ->

  forAll (arbitrary `suchThat` (`notElem` allnames)) $ \ othername ->

  let names = zip (take cnt allnames) (drop cnt allnames)

      nl = makeSmallCluster node cnt

      nodes = Container.elems nl

      nodes' = map (\((name, alias), nn) -> (Node.idx nn,

                                             nn { Node.name = name,

                                                  Node.alias = alias }))

               $ zip names nodes

      nl' = Container.fromList nodes'

      target = snd (nodes' !! fidx)

  in Container.findByName nl' (Node.name target) == Just target &&

     Container.findByName nl' (Node.alias target) == Just target &&

     isNothing (Container.findByName nl' othername)

testSuite "Container"

            [ 'prop_Container_addTwo

            , 'prop_Container_nameOf

            , 'prop_Container_findByName

            ]

-- ** Instance tests

-- Simple instance tests, we only have setter/getters

prop_Instance_creat inst =

  Instance.name inst ==? Instance.alias inst

prop_Instance_setIdx inst idx =

  Instance.idx (Instance.setIdx inst idx) ==? idx

    where _types = (inst::Instance.Instance, idx::Types.Idx)

prop_Instance_setName inst name =

  Instance.name newinst == name &&

  Instance.alias newinst == name

    where _types = (inst::Instance.Instance, name::String)

          newinst = Instance.setName inst name

prop_Instance_setAlias inst name =

  Instance.name newinst == Instance.name inst &&

  Instance.alias newinst == name

    where _types = (inst::Instance.Instance, name::String)

          newinst = Instance.setAlias inst name

prop_Instance_setPri inst pdx =

  Instance.pNode (Instance.setPri inst pdx) ==? pdx

    where _types = (inst::Instance.Instance, pdx::Types.Ndx)

prop_Instance_setSec inst sdx =

  Instance.sNode (Instance.setSec inst sdx) ==? sdx

    where _types = (inst::Instance.Instance, sdx::Types.Ndx)

prop_Instance_setBoth inst pdx sdx =

  Instance.pNode si == pdx && Instance.sNode si == sdx

    where _types = (inst::Instance.Instance, pdx::Types.Ndx, sdx::Types.Ndx)

          si = Instance.setBoth inst pdx sdx

prop_Instance_shrinkMG inst =

  Instance.mem inst >= 2 * Types.unitMem ==>

    case Instance.shrinkByType inst Types.FailMem of

      Types.Ok inst' -> Instance.mem inst' == Instance.mem inst - Types.unitMem

      _ -> False

prop_Instance_shrinkMF inst =

  forAll (choose (0, 2 * Types.unitMem - 1)) $ \mem ->

    let inst' = inst { Instance.mem = mem}

    in Types.isBad $ Instance.shrinkByType inst' Types.FailMem

prop_Instance_shrinkCG inst =

  Instance.vcpus inst >= 2 * Types.unitCpu ==>

    case Instance.shrinkByType inst Types.FailCPU of

      Types.Ok inst' ->

        Instance.vcpus inst' == Instance.vcpus inst - Types.unitCpu

      _ -> False

prop_Instance_shrinkCF inst =

  forAll (choose (0, 2 * Types.unitCpu - 1)) $ \vcpus ->

    let inst' = inst { Instance.vcpus = vcpus }

    in Types.isBad $ Instance.shrinkByType inst' Types.FailCPU

prop_Instance_shrinkDG inst =

  Instance.dsk inst >= 2 * Types.unitDsk ==>

    case Instance.shrinkByType inst Types.FailDisk of

      Types.Ok inst' ->

        Instance.dsk inst' == Instance.dsk inst - Types.unitDsk

      _ -> False

prop_Instance_shrinkDF inst =

  forAll (choose (0, 2 * Types.unitDsk - 1)) $ \dsk ->

    let inst' = inst { Instance.dsk = dsk }

    in Types.isBad $ Instance.shrinkByType inst' Types.FailDisk

prop_Instance_setMovable inst m =

  Instance.movable inst' ==? m

    where inst' = Instance.setMovable inst m

testSuite "Instance"

            [ 'prop_Instance_creat

            , 'prop_Instance_setIdx

            , 'prop_Instance_setName

            , 'prop_Instance_setAlias

            , 'prop_Instance_setPri

            , 'prop_Instance_setSec

            , 'prop_Instance_setBoth

            , 'prop_Instance_shrinkMG

            , 'prop_Instance_shrinkMF

            , 'prop_Instance_shrinkCG

            , 'prop_Instance_shrinkCF

            , 'prop_Instance_shrinkDG

            , 'prop_Instance_shrinkDF

            , 'prop_Instance_setMovable

            ]

-- ** Backends

-- *** Text backend tests

-- Instance text loader tests

prop_Text_Load_Instance name mem dsk vcpus status

                        (NonEmpty pnode) snode

                        (NonNegative pdx) (NonNegative sdx) autobal dt =

  pnode /= snode && pdx /= sdx ==>

  let vcpus_s = show vcpus

      dsk_s = show dsk

      mem_s = show mem

      status_s = Types.instanceStatusToRaw status

      ndx = if null snode

              then [(pnode, pdx)]

              else [(pnode, pdx), (snode, sdx)]

      nl = Data.Map.fromList ndx

      tags = ""

      sbal = if autobal then "Y" else "N"

      sdt = Types.diskTemplateToRaw dt

      inst = Text.loadInst nl

             [name, mem_s, dsk_s, vcpus_s, status_s,

              sbal, pnode, snode, sdt, tags]

      fail1 = Text.loadInst nl

              [name, mem_s, dsk_s, vcpus_s, status_s,

               sbal, pnode, pnode, tags]

      _types = ( name::String, mem::Int, dsk::Int

               , vcpus::Int, status::Types.InstanceStatus

               , snode::String

               , autobal::Bool)

  in case inst of

       Types.Bad msg -> failTest $ "Failed to load instance: " ++ msg

       Types.Ok (_, i) -> printTestCase "Mismatch in some field while\

                                        \ loading the instance" $

               Instance.name i == name &&

               Instance.vcpus i == vcpus &&

               Instance.mem i == mem &&

               Instance.pNode i == pdx &&

               Instance.sNode i == (if null snode

                                      then Node.noSecondary

                                      else sdx) &&

               Instance.autoBalance i == autobal &&

               Types.isBad fail1

prop_Text_Load_InstanceFail ktn fields =

  length fields /= 10 ==>

    case Text.loadInst nl fields of

      Types.Ok _ -> failTest "Managed to load instance from invalid data"

      Types.Bad msg -> printTestCase ("Unrecognised error message: " ++ msg) $

                       "Invalid/incomplete instance data: '" `isPrefixOf` msg

    where nl = Data.Map.fromList ktn

prop_Text_Load_Node name tm nm fm td fd tc fo =

  let conv v = if v < 0

                 then "?"

                 else show v

      tm_s = conv tm

      nm_s = conv nm

      fm_s = conv fm

      td_s = conv td

      fd_s = conv fd

      tc_s = conv tc

      fo_s = if fo

               then "Y"

               else "N"

      any_broken = any (< 0) [tm, nm, fm, td, fd, tc]

      gid = Group.uuid defGroup

  in case Text.loadNode defGroupAssoc

       [name, tm_s, nm_s, fm_s, td_s, fd_s, tc_s, fo_s, gid] of

       Nothing -> False

       Just (name', node) ->

         if fo || any_broken

           then Node.offline node

           else Node.name node == name' && name' == name &&

                Node.alias node == name &&

                Node.tMem node == fromIntegral tm &&

                Node.nMem node == nm &&

                Node.fMem node == fm &&

                Node.tDsk node == fromIntegral td &&

                Node.fDsk node == fd &&

                Node.tCpu node == fromIntegral tc

prop_Text_Load_NodeFail fields =

  length fields /= 8 ==> isNothing $ Text.loadNode Data.Map.empty fields

prop_Text_NodeLSIdempotent node =

  (Text.loadNode defGroupAssoc.

       Utils.sepSplit '|' . Text.serializeNode defGroupList) n ==

  Just (Node.name n, n)

    -- override failN1 to what loadNode returns by default

    where n = node { Node.failN1 = True, Node.offline = False

                   , Node.iPolicy = Types.defIPolicy }

prop_Text_ISpecIdempotent ispec =

  case Text.loadISpec "dummy" . Utils.sepSplit ',' .

       Text.serializeISpec $ ispec of

    Types.Bad msg -> failTest $ "Failed to load ispec: " ++ msg

    Types.Ok ispec' -> ispec ==? ispec'

prop_Text_IPolicyIdempotent ipol =

  case Text.loadIPolicy . Utils.sepSplit '|' $

       Text.serializeIPolicy owner ipol of

    Types.Bad msg -> failTest $ "Failed to load ispec: " ++ msg

    Types.Ok res -> (owner, ipol) ==? res

  where owner = "dummy"

-- | This property, while being in the text tests, does more than just

-- test end-to-end the serialisation and loading back workflow; it

-- also tests the Loader.mergeData and the actuall

-- Cluster.iterateAlloc (for well-behaving w.r.t. instance

-- allocations, not for the business logic). As such, it's a quite

-- complex and slow test, and that's the reason we restrict it to

-- small cluster sizes.

prop_Text_CreateSerialise =

  forAll genTags $ \ctags ->

  forAll (choose (1, 2)) $ \reqnodes ->

  forAll (choose (1, 20)) $ \maxiter ->

  forAll (choose (2, 10)) $ \count ->

  forAll genOnlineNode $ \node ->

  forAll (genInstanceSmallerThanNode node) $ \inst ->

  let inst' = Instance.setMovable inst (reqnodes == 2)

      nl = makeSmallCluster node count

  in case Cluster.genAllocNodes defGroupList nl reqnodes True >>= \allocn ->

     Cluster.iterateAlloc nl Container.empty (Just maxiter) inst' allocn [] []

     of

       Types.Bad msg -> failTest $ "Failed to allocate: " ++ msg

       Types.Ok (_, _, _, [], _) -> printTestCase

                                    "Failed to allocate: no allocations" False

       Types.Ok (_, nl', il', _, _) ->

         let cdata = Loader.ClusterData defGroupList nl' il' ctags

                     Types.defIPolicy

             saved = Text.serializeCluster cdata

         in case Text.parseData saved >>= Loader.mergeData [] [] [] [] of

              Types.Bad msg -> failTest $ "Failed to load/merge: " ++ msg

              Types.Ok (Loader.ClusterData gl2 nl2 il2 ctags2 cpol2) ->

                ctags ==? ctags2 .&&.

                Types.defIPolicy ==? cpol2 .&&.

                il' ==? il2 .&&.

                defGroupList ==? gl2 .&&.

                nl' ==? nl2

testSuite "Text"

            [ 'prop_Text_Load_Instance

            , 'prop_Text_Load_InstanceFail

            , 'prop_Text_Load_Node

            , 'prop_Text_Load_NodeFail

            , 'prop_Text_NodeLSIdempotent

            , 'prop_Text_ISpecIdempotent

            , 'prop_Text_IPolicyIdempotent

            , 'prop_Text_CreateSerialise

            ]

-- *** Simu backend

-- | Generates a tuple of specs for simulation.

genSimuSpec :: Gen (String, Int, Int, Int, Int)

genSimuSpec = do

  pol <- elements [C.allocPolicyPreferred,

                   C.allocPolicyLastResort, C.allocPolicyUnallocable,

                  "p", "a", "u"]

 -- should be reasonable (nodes/group), bigger values only complicate

 -- the display of failed tests, and we don't care (in this particular

 -- test) about big node groups

  nodes <- choose (0, 20)

  dsk <- choose (0, maxDsk)

  mem <- choose (0, maxMem)

  cpu <- choose (0, maxCpu)

  return (pol, nodes, dsk, mem, cpu)

-- | Checks that given a set of corrects specs, we can load them

-- successfully, and that at high-level the values look right.

prop_SimuLoad =

  forAll (choose (0, 10)) $ \ngroups ->

  forAll (replicateM ngroups genSimuSpec) $ \specs ->

  let strspecs = map (\(p, n, d, m, c) -> printf "%s,%d,%d,%d,%d"

                                          p n d m c::String) specs

      totnodes = sum $ map (\(_, n, _, _, _) -> n) specs

      mdc_in = concatMap (\(_, n, d, m, c) ->

                            replicate n (fromIntegral m, fromIntegral d,

                                         fromIntegral c,

                                         fromIntegral m, fromIntegral d)) specs

  in case Simu.parseData strspecs of

       Types.Bad msg -> failTest $ "Failed to load specs: " ++ msg

       Types.Ok (Loader.ClusterData gl nl il tags ipol) ->

         let nodes = map snd $ IntMap.toAscList nl

             nidx = map Node.idx nodes

             mdc_out = map (\n -> (Node.tMem n, Node.tDsk n, Node.tCpu n,

                                   Node.fMem n, Node.fDsk n)) nodes

         in

         Container.size gl ==? ngroups .&&.

         Container.size nl ==? totnodes .&&.

         Container.size il ==? 0 .&&.

         length tags ==? 0 .&&.

         ipol ==? Types.defIPolicy .&&.

         nidx ==? [1..totnodes] .&&.

         mdc_in ==? mdc_out .&&.

         map Group.iPolicy (Container.elems gl) ==?

             replicate ngroups Types.defIPolicy

testSuite "Simu"

            [ 'prop_SimuLoad

            ]

-- ** Node tests

prop_Node_setAlias node name =

  Node.name newnode == Node.name node &&

  Node.alias newnode == name

    where _types = (node::Node.Node, name::String)

          newnode = Node.setAlias node name

prop_Node_setOffline node status =

  Node.offline newnode ==? status

    where newnode = Node.setOffline node status

prop_Node_setXmem node xm =

  Node.xMem newnode ==? xm

    where newnode = Node.setXmem node xm

prop_Node_setMcpu node mc =

  Node.mCpu newnode ==? mc

    where newnode = Node.setMcpu node mc

-- | Check that an instance add with too high memory or disk will be

-- rejected.

prop_Node_addPriFM node inst =

  Instance.mem inst >= Node.fMem node && not (Node.failN1 node) &&

  not (Instance.instanceOffline inst) ==>

  case Node.addPri node inst'' of

    Types.OpFail Types.FailMem -> True

    _ -> False

  where _types = (node::Node.Node, inst::Instance.Instance)

        inst' = setInstanceSmallerThanNode node inst

        inst'' = inst' { Instance.mem = Instance.mem inst }

prop_Node_addPriFD node inst =

  Instance.dsk inst >= Node.fDsk node && not (Node.failN1 node) ==>

    case Node.addPri node inst'' of

      Types.OpFail Types.FailDisk -> True

      _ -> False

    where _types = (node::Node.Node, inst::Instance.Instance)

          inst' = setInstanceSmallerThanNode node inst

          inst'' = inst' { Instance.dsk = Instance.dsk inst }

prop_Node_addPriFC (Positive extra) =

  forAll genOnlineNode $ \node ->

  forAll (arbitrary `suchThat` Instance.instanceNotOffline) $ \inst ->

  let inst' = setInstanceSmallerThanNode node inst

      inst'' = inst' { Instance.vcpus = Node.availCpu node + extra }

  in case Node.addPri node inst'' of

       Types.OpFail Types.FailCPU -> property True

       v -> failTest $ "Expected OpFail FailCPU, but got " ++ show v

-- | Check that an instance add with too high memory or disk will be

-- rejected.

prop_Node_addSec node inst pdx =

  ((Instance.mem inst >= (Node.fMem node - Node.rMem node) &&

    not (Instance.instanceOffline inst)) ||

   Instance.dsk inst >= Node.fDsk node) &&

  not (Node.failN1 node) ==>

      isFailure (Node.addSec node inst pdx)

        where _types = (node::Node.Node, inst::Instance.Instance, pdx::Int)

-- | Check that an offline instance with reasonable disk size can always

-- be added.

prop_Node_addPriOffline =

  forAll (arbitrary `suchThat` ((> 0) . Node.fMem)) $ \node ->

  forAll (arbitrary `suchThat`

          (\ x ->  (Instance.dsk x  < Node.fDsk node) &&

                   Instance.instanceOffline x)) $ \inst ->

  case Node.addPri node inst of

    Types.OpGood _ -> True

    _ -> False

prop_Node_addSecOffline pdx =

  forAll genOnlineNode $ \node ->

  forAll (arbitrary `suchThat`

          (\ inst -> Instance.dsk inst  < Node.availDisk node)) $ \inst ->

  case Node.addSec node (inst { Instance.runSt = Types.AdminOffline }) pdx of

    Types.OpGood _ -> True

    _ -> False

-- | Checks for memory reservation changes.

prop_Node_rMem inst =

  not (Instance.instanceOffline inst) ==>

  forAll (arbitrary `suchThat` ((> Types.unitMem) . Node.fMem)) $ \node ->

  -- ab = auto_balance, nb = non-auto_balance

  -- we use -1 as the primary node of the instance

  let inst' = inst { Instance.pNode = -1, Instance.autoBalance = True }

      inst_ab = setInstanceSmallerThanNode node inst'

      inst_nb = inst_ab { Instance.autoBalance = False }

      -- now we have the two instances, identical except the

      -- autoBalance attribute

      orig_rmem = Node.rMem node

      inst_idx = Instance.idx inst_ab

      node_add_ab = Node.addSec node inst_ab (-1)

      node_add_nb = Node.addSec node inst_nb (-1)

      node_del_ab = liftM (`Node.removeSec` inst_ab) node_add_ab

      node_del_nb = liftM (`Node.removeSec` inst_nb) node_add_nb

  in case (node_add_ab, node_add_nb, node_del_ab, node_del_nb) of

       (Types.OpGood a_ab, Types.OpGood a_nb,

        Types.OpGood d_ab, Types.OpGood d_nb) ->

         printTestCase "Consistency checks failed" $

           Node.rMem a_ab >  orig_rmem &&

           Node.rMem a_ab - orig_rmem == Instance.mem inst_ab &&

           Node.rMem a_nb == orig_rmem &&

           Node.rMem d_ab == orig_rmem &&

           Node.rMem d_nb == orig_rmem &&

           -- this is not related to rMem, but as good a place to

           -- test as any

           inst_idx `elem` Node.sList a_ab &&

           inst_idx `notElem` Node.sList d_ab

       x -> failTest $ "Failed to add/remove instances: " ++ show x

-- | Check mdsk setting.

prop_Node_setMdsk node mx =

  Node.loDsk node' >= 0 &&

  fromIntegral (Node.loDsk node') <= Node.tDsk node &&

  Node.availDisk node' >= 0 &&

  Node.availDisk node' <= Node.fDsk node' &&

  fromIntegral (Node.availDisk node') <= Node.tDsk node' &&

  Node.mDsk node' == mx'

    where _types = (node::Node.Node, mx::SmallRatio)

          node' = Node.setMdsk node mx'

          SmallRatio mx' = mx

-- Check tag maps

prop_Node_tagMaps_idempotent tags =

  Node.delTags (Node.addTags m tags) tags ==? m

    where m = Data.Map.empty

prop_Node_tagMaps_reject tags =

  not (null tags) ==>

  all (\t -> Node.rejectAddTags m [t]) tags

    where m = Node.addTags Data.Map.empty tags

prop_Node_showField node =

  forAll (elements Node.defaultFields) $ \ field ->

  fst (Node.showHeader field) /= Types.unknownField &&

  Node.showField node field /= Types.unknownField

prop_Node_computeGroups nodes =

  let ng = Node.computeGroups nodes

      onlyuuid = map fst ng

  in length nodes == sum (map (length . snd) ng) &&

     all (\(guuid, ns) -> all ((== guuid) . Node.group) ns) ng &&

     length (nub onlyuuid) == length onlyuuid &&

     (null nodes || not (null ng))

testSuite "Node"

            [ 'prop_Node_setAlias

            , 'prop_Node_setOffline

            , 'prop_Node_setMcpu

            , 'prop_Node_setXmem

            , 'prop_Node_addPriFM

            , 'prop_Node_addPriFD

            , 'prop_Node_addPriFC

            , 'prop_Node_addSec

            , 'prop_Node_addPriOffline

            , 'prop_Node_addSecOffline

            , 'prop_Node_rMem

            , 'prop_Node_setMdsk

            , 'prop_Node_tagMaps_idempotent

            , 'prop_Node_tagMaps_reject

            , 'prop_Node_showField

            , 'prop_Node_computeGroups

            ]

-- ** Cluster tests

-- | Check that the cluster score is close to zero for a homogeneous

-- cluster.

prop_Score_Zero node =

  forAll (choose (1, 1024)) $ \count ->

    (not (Node.offline node) && not (Node.failN1 node) && (count > 0) &&

     (Node.tDsk node > 0) && (Node.tMem node > 0)) ==>

  let fn = Node.buildPeers node Container.empty

      nlst = replicate count fn

      score = Cluster.compCVNodes nlst

  -- we can't say == 0 here as the floating point errors accumulate;

  -- this should be much lower than the default score in CLI.hs

  in score <= 1e-12

-- | Check that cluster stats are sane.

prop_CStats_sane =

  forAll (choose (1, 1024)) $ \count ->

  forAll genOnlineNode $ \node ->

  let fn = Node.buildPeers node Container.empty

      nlst = zip [1..] $ replicate count fn::[(Types.Ndx, Node.Node)]

      nl = Container.fromList nlst

      cstats = Cluster.totalResources nl

  in Cluster.csAdsk cstats >= 0 &&

     Cluster.csAdsk cstats <= Cluster.csFdsk cstats

-- | Check that one instance is allocated correctly, without

-- rebalances needed.

prop_ClusterAlloc_sane inst =

  forAll (choose (5, 20)) $ \count ->

  forAll genOnlineNode $ \node ->

  let (nl, il, inst') = makeSmallEmptyCluster node count inst

  in case Cluster.genAllocNodes defGroupList nl 2 True >>=

     Cluster.tryAlloc nl il inst' of

       Types.Bad _ -> False

       Types.Ok as ->

         case Cluster.asSolution as of

           Nothing -> False

           Just (xnl, xi, _, cv) ->

             let il' = Container.add (Instance.idx xi) xi il

                 tbl = Cluster.Table xnl il' cv []

             in not (canBalance tbl True True False)

-- | Checks that on a 2-5 node cluster, we can allocate a random

-- instance spec via tiered allocation (whatever the original instance

-- spec), on either one or two nodes.

prop_ClusterCanTieredAlloc inst =

  forAll (choose (2, 5)) $ \count ->

  forAll (choose (1, 2)) $ \rqnodes ->

  forAll (genOnlineNode `suchThat` (isNodeBig 4)) $ \node ->

  let nl = makeSmallCluster node count

      il = Container.empty

      allocnodes = Cluster.genAllocNodes defGroupList nl rqnodes True

  in case allocnodes >>= \allocnodes' ->

    Cluster.tieredAlloc nl il (Just 1) inst allocnodes' [] [] of

       Types.Bad _ -> False

       Types.Ok (_, _, il', ixes, cstats) -> not (null ixes) &&

                                             IntMap.size il' == length ixes &&

                                             length ixes == length cstats

-- | Helper function to create a cluster with the given range of nodes

-- and allocate an instance on it.

genClusterAlloc count node inst =

  let nl = makeSmallCluster node count

  in case Cluster.genAllocNodes defGroupList nl 2 True >>=

     Cluster.tryAlloc nl Container.empty inst of

       Types.Bad _ -> Types.Bad "Can't allocate"

       Types.Ok as ->

         case Cluster.asSolution as of

           Nothing -> Types.Bad "Empty solution?"

           Just (xnl, xi, _, _) ->

             let xil = Container.add (Instance.idx xi) xi Container.empty

             in Types.Ok (xnl, xil, xi)

-- | Checks that on a 4-8 node cluster, once we allocate an instance,

-- we can also relocate it.

prop_ClusterAllocRelocate =

  forAll (choose (4, 8)) $ \count ->

  forAll (genOnlineNode `suchThat` (isNodeBig 4)) $ \node ->

  forAll (genInstanceSmallerThanNode node) $ \inst ->

  case genClusterAlloc count node inst of

    Types.Bad msg -> failTest msg

    Types.Ok (nl, il, inst') ->

      case IAlloc.processRelocate defGroupList nl il

             (Instance.idx inst) 1 [Instance.sNode inst'] of

        Types.Ok _ -> printTestCase "??" True  -- huh, how to make

                                               -- this nicer...

        Types.Bad msg -> failTest $ "Failed to relocate: " ++ msg

-- | Helper property checker for the result of a nodeEvac or

-- changeGroup operation.

check_EvacMode grp inst result =

  case result of

    Types.Bad msg -> failTest $ "Couldn't evacuate/change group:" ++ msg

    Types.Ok (_, _, es) ->

      let moved = Cluster.esMoved es

          failed = Cluster.esFailed es

          opcodes = not . null $ Cluster.esOpCodes es

      in failmsg ("'failed' not empty: " ++ show failed) (null failed) .&&.

         failmsg "'opcodes' is null" opcodes .&&.

         case moved of

           [(idx', gdx, _)] -> failmsg "invalid instance moved" (idx == idx')

                               .&&.

                               failmsg "wrong target group"

                                         (gdx == Group.idx grp)

           v -> failmsg  ("invalid solution: " ++ show v) False

  where failmsg = \msg -> printTestCase ("Failed to evacuate: " ++ msg)

        idx = Instance.idx inst

-- | Checks that on a 4-8 node cluster, once we allocate an instance,

-- we can also node-evacuate it.

prop_ClusterAllocEvacuate =

  forAll (choose (4, 8)) $ \count ->

  forAll (genOnlineNode `suchThat` (isNodeBig 4)) $ \node ->

  forAll (genInstanceSmallerThanNode node) $ \inst ->

  case genClusterAlloc count node inst of

    Types.Bad msg -> failTest msg

    Types.Ok (nl, il, inst') ->

      conjoin $ map (\mode -> check_EvacMode defGroup inst' $

                              Cluster.tryNodeEvac defGroupList nl il mode

                                [Instance.idx inst']) [minBound..maxBound]

-- | Checks that on a 4-8 node cluster with two node groups, once we

-- allocate an instance on the first node group, we can also change

-- its group.

prop_ClusterAllocChangeGroup =

  forAll (choose (4, 8)) $ \count ->

  forAll (genOnlineNode `suchThat` (isNodeBig 4)) $ \node ->

  forAll (genInstanceSmallerThanNode node) $ \inst ->

  case genClusterAlloc count node inst of

    Types.Bad msg -> failTest msg

    Types.Ok (nl, il, inst') ->

      -- we need to add a second node group and nodes to the cluster

      let nl2 = Container.elems $ makeSmallCluster node count

          grp2 = Group.setIdx defGroup (Group.idx defGroup + 1)

          maxndx = maximum . map Node.idx $ nl2

          nl3 = map (\n -> n { Node.group = Group.idx grp2

                             , Node.idx = Node.idx n + maxndx }) nl2

          nl4 = Container.fromList . map (\n -> (Node.idx n, n)) $ nl3

          gl' = Container.add (Group.idx grp2) grp2 defGroupList

          nl' = IntMap.union nl nl4

      in check_EvacMode grp2 inst' $

         Cluster.tryChangeGroup gl' nl' il [] [Instance.idx inst']

-- | Check that allocating multiple instances on a cluster, then

-- adding an empty node, results in a valid rebalance.

prop_ClusterAllocBalance =

  forAll (genNode (Just 5) (Just 128)) $ \node ->

  forAll (choose (3, 5)) $ \count ->

  not (Node.offline node) && not (Node.failN1 node) ==>

  let nl = makeSmallCluster node count

      (hnode, nl') = IntMap.deleteFindMax nl

      il = Container.empty

      allocnodes = Cluster.genAllocNodes defGroupList nl' 2 True

      i_templ = createInstance Types.unitMem Types.unitDsk Types.unitCpu

  in case allocnodes >>= \allocnodes' ->

    Cluster.iterateAlloc nl' il (Just 5) i_templ allocnodes' [] [] of

       Types.Bad msg -> failTest $ "Failed to allocate: " ++ msg

       Types.Ok (_, _, _, [], _) -> failTest "Failed to allocate: no instances"

       Types.Ok (_, xnl, il', _, _) ->

         let ynl = Container.add (Node.idx hnode) hnode xnl

             cv = Cluster.compCV ynl

             tbl = Cluster.Table ynl il' cv []

         in printTestCase "Failed to rebalance" $

            canBalance tbl True True False

-- | Checks consistency.

prop_ClusterCheckConsistency node inst =

  let nl = makeSmallCluster node 3

      [node1, node2, node3] = Container.elems nl

      node3' = node3 { Node.group = 1 }

      nl' = Container.add (Node.idx node3') node3' nl

      inst1 = Instance.setBoth inst (Node.idx node1) (Node.idx node2)

      inst2 = Instance.setBoth inst (Node.idx node1) Node.noSecondary

      inst3 = Instance.setBoth inst (Node.idx node1) (Node.idx node3)

      ccheck = Cluster.findSplitInstances nl' . Container.fromList

  in null (ccheck [(0, inst1)]) &&

     null (ccheck [(0, inst2)]) &&

     (not . null $ ccheck [(0, inst3)])

-- | For now, we only test that we don't lose instances during the split.

prop_ClusterSplitCluster node inst =

  forAll (choose (0, 100)) $ \icnt ->

  let nl = makeSmallCluster node 2

      (nl', il') = foldl (\(ns, is) _ -> assignInstance ns is inst 0 1)

                   (nl, Container.empty) [1..icnt]

      gni = Cluster.splitCluster nl' il'

  in sum (map (Container.size . snd . snd) gni) == icnt &&

     all (\(guuid, (nl'', _)) -> all ((== guuid) . Node.group)

                                 (Container.elems nl'')) gni

-- | Helper function to check if we can allocate an instance on a

-- given node list.

canAllocOn :: Node.List -> Int -> Instance.Instance -> Bool

canAllocOn nl reqnodes inst =

  case Cluster.genAllocNodes defGroupList nl reqnodes True >>=

       Cluster.tryAlloc nl (Container.empty) inst of

       Types.Bad _ -> False

       Types.Ok as ->

         case Cluster.asSolution as of

           Nothing -> False

           Just _ -> True

-- | Checks that allocation obeys minimum and maximum instance

-- policies. The unittest generates a random node, duplicates it count

-- times, and generates a random instance that can be allocated on

-- this mini-cluster; it then checks that after applying a policy that

-- the instance doesn't fits, the allocation fails.

prop_ClusterAllocPolicy node =

  -- rqn is the required nodes (1 or 2)

  forAll (choose (1, 2)) $ \rqn ->

  forAll (choose (5, 20)) $ \count ->

  forAll (arbitrary `suchThat` (canAllocOn (makeSmallCluster node count) rqn))

         $ \inst ->

  forAll (arbitrary `suchThat` (isFailure .

                                Instance.instMatchesPolicy inst)) $ \ipol ->

  let node' = Node.setPolicy ipol node

      nl = makeSmallCluster node' count

  in not $ canAllocOn nl rqn inst

testSuite "Cluster"

            [ 'prop_Score_Zero

            , 'prop_CStats_sane

            , 'prop_ClusterAlloc_sane

            , 'prop_ClusterCanTieredAlloc

            , 'prop_ClusterAllocRelocate

            , 'prop_ClusterAllocEvacuate

            , 'prop_ClusterAllocChangeGroup

            , 'prop_ClusterAllocBalance

            , 'prop_ClusterCheckConsistency

            , 'prop_ClusterSplitCluster

            , 'prop_ClusterAllocPolicy

            ]

-- ** OpCodes tests

-- | Check that opcode serialization is idempotent.

prop_OpCodes_serialization op =

  case J.readJSON (J.showJSON op) of

    J.Error e -> failTest $ "Cannot deserialise: " ++ e

    J.Ok op' -> op ==? op'

  where _types = op::OpCodes.OpCode

testSuite "OpCodes"

            [ 'prop_OpCodes_serialization ]

-- ** Jobs tests

-- | Check that (queued) job\/opcode status serialization is idempotent.

prop_OpStatus_serialization os =

  case J.readJSON (J.showJSON os) of

    J.Error e -> failTest $ "Cannot deserialise: " ++ e

    J.Ok os' -> os ==? os'

  where _types = os::Jobs.OpStatus

prop_JobStatus_serialization js =

  case J.readJSON (J.showJSON js) of

    J.Error e -> failTest $ "Cannot deserialise: " ++ e

    J.Ok js' -> js ==? js'

  where _types = js::Jobs.JobStatus

testSuite "Jobs"

            [ 'prop_OpStatus_serialization

            , 'prop_JobStatus_serialization

            ]

-- ** Loader tests

prop_Loader_lookupNode ktn inst node =

  Loader.lookupNode nl inst node ==? Data.Map.lookup node nl

    where nl = Data.Map.fromList ktn

prop_Loader_lookupInstance kti inst =

  Loader.lookupInstance il inst ==? Data.Map.lookup inst il

    where il = Data.Map.fromList kti

prop_Loader_assignIndices =

  -- generate nodes with unique names

  forAll (arbitrary `suchThat`

          (\nodes ->

             let names = map Node.name nodes

             in length names == length (nub names))) $ \nodes ->

  let (nassoc, kt) =

        Loader.assignIndices (map (\n -> (Node.name n, n)) nodes)

  in Data.Map.size nassoc == length nodes &&

     Container.size kt == length nodes &&

     if not (null nodes)

       then maximum (IntMap.keys kt) == length nodes - 1

       else True

-- | Checks that the number of primary instances recorded on the nodes

-- is zero.

prop_Loader_mergeData ns =

  let na = Container.fromList $ map (\n -> (Node.idx n, n)) ns

  in case Loader.mergeData [] [] [] []

         (Loader.emptyCluster {Loader.cdNodes = na}) of

    Types.Bad _ -> False

    Types.Ok (Loader.ClusterData _ nl il _ _) ->

      let nodes = Container.elems nl

          instances = Container.elems il

      in (sum . map (length . Node.pList)) nodes == 0 &&

         null instances

-- | Check that compareNameComponent on equal strings works.

prop_Loader_compareNameComponent_equal :: String -> Bool

prop_Loader_compareNameComponent_equal s =

  Loader.compareNameComponent s s ==

    Loader.LookupResult Loader.ExactMatch s

-- | Check that compareNameComponent on prefix strings works.

prop_Loader_compareNameComponent_prefix :: NonEmptyList Char -> String -> Bool

prop_Loader_compareNameComponent_prefix (NonEmpty s1) s2 =

  Loader.compareNameComponent (s1 ++ "." ++ s2) s1 ==

    Loader.LookupResult Loader.PartialMatch s1

testSuite "Loader"

            [ 'prop_Loader_lookupNode

            , 'prop_Loader_lookupInstance

            , 'prop_Loader_assignIndices

            , 'prop_Loader_mergeData

            , 'prop_Loader_compareNameComponent_equal

            , 'prop_Loader_compareNameComponent_prefix

            ]

-- ** Types tests

prop_Types_AllocPolicy_serialisation apol =

  case J.readJSON (J.showJSON apol) of

    J.Ok p -> p ==? apol

    J.Error s -> failTest $ "Failed to deserialise: " ++ s

      where _types = apol::Types.AllocPolicy

prop_Types_DiskTemplate_serialisation dt =

  case J.readJSON (J.showJSON dt) of

    J.Ok p -> p ==? dt

    J.Error s -> failTest $ "Failed to deserialise: " ++ s

      where _types = dt::Types.DiskTemplate

prop_Types_ISpec_serialisation ispec =

  case J.readJSON (J.showJSON ispec) of

    J.Ok p -> p ==? ispec

    J.Error s -> failTest $ "Failed to deserialise: " ++ s

      where _types = ispec::Types.ISpec

prop_Types_IPolicy_serialisation ipol =

  case J.readJSON (J.showJSON ipol) of

    J.Ok p -> p ==? ipol

    J.Error s -> failTest $ "Failed to deserialise: " ++ s

      where _types = ipol::Types.IPolicy

prop_Types_EvacMode_serialisation em =

  case J.readJSON (J.showJSON em) of

    J.Ok p -> p ==? em

    J.Error s -> failTest $ "Failed to deserialise: " ++ s

      where _types = em::Types.EvacMode

prop_Types_opToResult op =

  case op of

    Types.OpFail _ -> Types.isBad r

    Types.OpGood v -> case r of

                        Types.Bad _ -> False

                        Types.Ok v' -> v == v'

  where r = Types.opToResult op

        _types = op::Types.OpResult Int

prop_Types_eitherToResult ei =

  case ei of

    Left _ -> Types.isBad r

    Right v -> case r of

                 Types.Bad _ -> False

                 Types.Ok v' -> v == v'

    where r = Types.eitherToResult ei

          _types = ei::Either String Int

testSuite "Types"

            [ 'prop_Types_AllocPolicy_serialisation

            , 'prop_Types_DiskTemplate_serialisation

            , 'prop_Types_ISpec_serialisation

            , 'prop_Types_IPolicy_serialisation

            , 'prop_Types_EvacMode_serialisation

            , 'prop_Types_opToResult

            , 'prop_Types_eitherToResult

            ]