root / htools / Ganeti / HTools / Types.hs @ 277a2ec9
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{-# LANGUAGE TemplateHaskell #-} |
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{-| Some common types. |
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-} |
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{- |
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Copyright (C) 2009, 2010, 2011, 2012 Google Inc. |
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This program is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 2 of the License, or |
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(at your option) any later version. |
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|
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This program is distributed in the hope that it will be useful, but |
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WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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General Public License for more details. |
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|
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You should have received a copy of the GNU General Public License |
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along with this program; if not, write to the Free Software |
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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02110-1301, USA. |
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-} |
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module Ganeti.HTools.Types |
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( Idx |
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, Ndx |
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, Gdx |
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, NameAssoc |
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, Score |
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, Weight |
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, GroupID |
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, defaultGroupID |
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, AllocPolicy(..) |
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, allocPolicyFromRaw |
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, allocPolicyToRaw |
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, InstanceStatus(..) |
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, instanceStatusFromRaw |
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, instanceStatusToRaw |
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, RSpec(..) |
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, AllocInfo(..) |
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, AllocStats |
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, DynUtil(..) |
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, zeroUtil |
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, baseUtil |
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, addUtil |
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, subUtil |
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, defReservedDiskRatio |
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, unitMem |
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, unitCpu |
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, unitDsk |
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, unknownField |
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, Placement |
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, IMove(..) |
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, DiskTemplate(..) |
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, diskTemplateToRaw |
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, diskTemplateFromRaw |
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, MirrorType(..) |
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, templateMirrorType |
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, MoveJob |
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, JobSet |
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, Element(..) |
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, FailMode(..) |
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, FailStats |
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, OpResult |
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, opToResult |
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, EvacMode(..) |
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, ISpec(..) |
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, IPolicy(..) |
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, defIPolicy |
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, rspecFromISpec |
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) where |
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|
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import qualified Data.Map as M |
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import qualified Ganeti.Constants as C |
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import qualified Ganeti.THH as THH |
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import Ganeti.BasicTypes |
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import Ganeti.Types |
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|
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-- | The instance index type. |
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type Idx = Int |
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-- | The node index type. |
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type Ndx = Int |
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-- | The group index type. |
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type Gdx = Int |
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-- | The type used to hold name-to-idx mappings. |
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type NameAssoc = M.Map String Int |
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-- | A separate name for the cluster score type. |
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type Score = Double |
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-- | A separate name for a weight metric. |
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type Weight = Double |
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-- | The Group UUID type. |
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type GroupID = String |
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-- | Default group UUID (just a string, not a real UUID). |
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defaultGroupID :: GroupID |
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defaultGroupID = "00000000-0000-0000-0000-000000000000" |
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|
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-- | Mirroring type. |
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data MirrorType = MirrorNone -- ^ No mirroring/movability |
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| MirrorInternal -- ^ DRBD-type mirroring |
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| MirrorExternal -- ^ Shared-storage type mirroring |
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deriving (Eq, Show) |
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-- | Correspondence between disk template and mirror type. |
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templateMirrorType :: DiskTemplate -> MirrorType |
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templateMirrorType DTDiskless = MirrorExternal |
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templateMirrorType DTFile = MirrorNone |
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templateMirrorType DTSharedFile = MirrorExternal |
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templateMirrorType DTPlain = MirrorNone |
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templateMirrorType DTBlock = MirrorExternal |
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templateMirrorType DTDrbd8 = MirrorInternal |
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templateMirrorType DTRbd = MirrorExternal |
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templateMirrorType DTExt = MirrorExternal |
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-- | The resource spec type. |
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data RSpec = RSpec |
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{ rspecCpu :: Int -- ^ Requested VCPUs |
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, rspecMem :: Int -- ^ Requested memory |
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, rspecDsk :: Int -- ^ Requested disk |
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} deriving (Show, Eq) |
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-- | Allocation stats type. This is used instead of 'RSpec' (which was |
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-- used at first), because we need to track more stats. The actual |
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-- data can refer either to allocated, or available, etc. values |
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-- depending on the context. See also |
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-- 'Cluster.computeAllocationDelta'. |
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data AllocInfo = AllocInfo |
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{ allocInfoVCpus :: Int -- ^ VCPUs |
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, allocInfoNCpus :: Double -- ^ Normalised CPUs |
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, allocInfoMem :: Int -- ^ Memory |
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, allocInfoDisk :: Int -- ^ Disk |
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} deriving (Show, Eq) |
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-- | Currently used, possibly to allocate, unallocable. |
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type AllocStats = (AllocInfo, AllocInfo, AllocInfo) |
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-- | Instance specification type. |
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$(THH.buildObject "ISpec" "iSpec" |
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[ THH.renameField "MemorySize" $ THH.simpleField C.ispecMemSize [t| Int |] |
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, THH.renameField "CpuCount" $ THH.simpleField C.ispecCpuCount [t| Int |] |
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, THH.renameField "DiskSize" $ THH.simpleField C.ispecDiskSize [t| Int |] |
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, THH.renameField "DiskCount" $ THH.simpleField C.ispecDiskCount [t| Int |] |
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, THH.renameField "NicCount" $ THH.simpleField C.ispecNicCount [t| Int |] |
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, THH.renameField "SpindleUse" $ THH.simpleField C.ispecSpindleUse [t| Int |] |
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]) |
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-- | The default minimum ispec. |
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defMinISpec :: ISpec |
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defMinISpec = ISpec { iSpecMemorySize = C.ipolicyDefaultsMinMemorySize |
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, iSpecCpuCount = C.ipolicyDefaultsMinCpuCount |
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, iSpecDiskSize = C.ipolicyDefaultsMinDiskSize |
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, iSpecDiskCount = C.ipolicyDefaultsMinDiskCount |
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, iSpecNicCount = C.ipolicyDefaultsMinNicCount |
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, iSpecSpindleUse = C.ipolicyDefaultsMinSpindleUse |
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} |
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-- | The default standard ispec. |
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defStdISpec :: ISpec |
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defStdISpec = ISpec { iSpecMemorySize = C.ipolicyDefaultsStdMemorySize |
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, iSpecCpuCount = C.ipolicyDefaultsStdCpuCount |
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, iSpecDiskSize = C.ipolicyDefaultsStdDiskSize |
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, iSpecDiskCount = C.ipolicyDefaultsStdDiskCount |
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, iSpecNicCount = C.ipolicyDefaultsStdNicCount |
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, iSpecSpindleUse = C.ipolicyDefaultsStdSpindleUse |
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} |
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-- | The default max ispec. |
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defMaxISpec :: ISpec |
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defMaxISpec = ISpec { iSpecMemorySize = C.ipolicyDefaultsMaxMemorySize |
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, iSpecCpuCount = C.ipolicyDefaultsMaxCpuCount |
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, iSpecDiskSize = C.ipolicyDefaultsMaxDiskSize |
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, iSpecDiskCount = C.ipolicyDefaultsMaxDiskCount |
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, iSpecNicCount = C.ipolicyDefaultsMaxNicCount |
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, iSpecSpindleUse = C.ipolicyDefaultsMaxSpindleUse |
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} |
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-- | Instance policy type. |
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$(THH.buildObject "IPolicy" "iPolicy" |
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[ THH.renameField "StdSpec" $ THH.simpleField C.ispecsStd [t| ISpec |] |
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, THH.renameField "MinSpec" $ THH.simpleField C.ispecsMin [t| ISpec |] |
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, THH.renameField "MaxSpec" $ THH.simpleField C.ispecsMax [t| ISpec |] |
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, THH.renameField "DiskTemplates" $ |
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THH.simpleField C.ipolicyDts [t| [DiskTemplate] |] |
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, THH.renameField "VcpuRatio" $ |
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THH.simpleField C.ipolicyVcpuRatio [t| Double |] |
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, THH.renameField "SpindleRatio" $ |
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THH.simpleField C.ipolicySpindleRatio [t| Double |] |
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]) |
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-- | Converts an ISpec type to a RSpec one. |
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rspecFromISpec :: ISpec -> RSpec |
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rspecFromISpec ispec = RSpec { rspecCpu = iSpecCpuCount ispec |
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, rspecMem = iSpecMemorySize ispec |
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, rspecDsk = iSpecDiskSize ispec |
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} |
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-- | The default instance policy. |
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defIPolicy :: IPolicy |
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defIPolicy = IPolicy { iPolicyStdSpec = defStdISpec |
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, iPolicyMinSpec = defMinISpec |
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, iPolicyMaxSpec = defMaxISpec |
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-- hardcoding here since Constants.hs exports the |
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-- string values, not the actual type; and in |
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-- htools, we are mostly looking at DRBD |
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, iPolicyDiskTemplates = [minBound..maxBound] |
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, iPolicyVcpuRatio = C.ipolicyDefaultsVcpuRatio |
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, iPolicySpindleRatio = C.ipolicyDefaultsSpindleRatio |
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} |
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-- | The dynamic resource specs of a machine (i.e. load or load |
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-- capacity, as opposed to size). |
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data DynUtil = DynUtil |
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{ cpuWeight :: Weight -- ^ Standardised CPU usage |
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, memWeight :: Weight -- ^ Standardised memory load |
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, dskWeight :: Weight -- ^ Standardised disk I\/O usage |
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, netWeight :: Weight -- ^ Standardised network usage |
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} deriving (Show, Eq) |
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-- | Initial empty utilisation. |
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zeroUtil :: DynUtil |
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zeroUtil = DynUtil { cpuWeight = 0, memWeight = 0 |
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, dskWeight = 0, netWeight = 0 } |
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-- | Base utilisation (used when no actual utilisation data is |
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-- supplied). |
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baseUtil :: DynUtil |
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baseUtil = DynUtil { cpuWeight = 1, memWeight = 1 |
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, dskWeight = 1, netWeight = 1 } |
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-- | Sum two utilisation records. |
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addUtil :: DynUtil -> DynUtil -> DynUtil |
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addUtil (DynUtil a1 a2 a3 a4) (DynUtil b1 b2 b3 b4) = |
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DynUtil (a1+b1) (a2+b2) (a3+b3) (a4+b4) |
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-- | Substracts one utilisation record from another. |
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subUtil :: DynUtil -> DynUtil -> DynUtil |
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subUtil (DynUtil a1 a2 a3 a4) (DynUtil b1 b2 b3 b4) = |
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DynUtil (a1-b1) (a2-b2) (a3-b3) (a4-b4) |
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-- | The description of an instance placement. It contains the |
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-- instance index, the new primary and secondary node, the move being |
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-- performed and the score of the cluster after the move. |
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type Placement = (Idx, Ndx, Ndx, IMove, Score) |
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-- | An instance move definition. |
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data IMove = Failover -- ^ Failover the instance (f) |
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| FailoverToAny Ndx -- ^ Failover to a random node |
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-- (fa:np), for shared storage |
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| ReplacePrimary Ndx -- ^ Replace primary (f, r:np, f) |
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| ReplaceSecondary Ndx -- ^ Replace secondary (r:ns) |
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| ReplaceAndFailover Ndx -- ^ Replace secondary, failover (r:np, f) |
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| FailoverAndReplace Ndx -- ^ Failover, replace secondary (f, r:ns) |
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deriving (Show) |
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-- | Formatted solution output for one move (involved nodes and |
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-- commands. |
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type MoveJob = ([Ndx], Idx, IMove, [String]) |
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-- | Unknown field in table output. |
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unknownField :: String |
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unknownField = "<unknown field>" |
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-- | A list of command elements. |
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type JobSet = [MoveJob] |
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-- | Default max disk usage ratio. |
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defReservedDiskRatio :: Double |
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defReservedDiskRatio = 0 |
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-- | Base memory unit. |
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unitMem :: Int |
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unitMem = 64 |
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-- | Base disk unit. |
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unitDsk :: Int |
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unitDsk = 256 |
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-- | Base vcpus unit. |
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unitCpu :: Int |
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unitCpu = 1 |
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-- | Reason for an operation's falure. |
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data FailMode = FailMem -- ^ Failed due to not enough RAM |
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| FailDisk -- ^ Failed due to not enough disk |
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| FailCPU -- ^ Failed due to not enough CPU capacity |
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| FailN1 -- ^ Failed due to not passing N1 checks |
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| FailTags -- ^ Failed due to tag exclusion |
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deriving (Eq, Enum, Bounded, Show) |
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-- | List with failure statistics. |
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type FailStats = [(FailMode, Int)] |
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-- | Either-like data-type customized for our failure modes. |
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-- |
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-- The failure values for this monad track the specific allocation |
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-- failures, so this is not a general error-monad (compare with the |
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-- 'Result' data type). One downside is that this type cannot encode a |
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-- generic failure mode, hence our way to build a FailMode from string |
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-- will instead raise an exception. |
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type OpResult = GenericResult FailMode |
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-- | 'FromString' instance for 'FailMode' designed to catch unintended |
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-- use as a general monad. |
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instance FromString FailMode where |
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mkFromString v = error $ "Programming error: OpResult used as generic monad" |
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++ v |
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-- | Conversion from 'OpResult' to 'Result'. |
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opToResult :: OpResult a -> Result a |
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opToResult (Bad f) = Bad $ show f |
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opToResult (Ok v) = Ok v |
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-- | A generic class for items that have updateable names and indices. |
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class Element a where |
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-- | Returns the name of the element |
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nameOf :: a -> String |
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-- | Returns all the known names of the element |
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allNames :: a -> [String] |
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-- | Returns the index of the element |
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idxOf :: a -> Int |
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-- | Updates the alias of the element |
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setAlias :: a -> String -> a |
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-- | Compute the alias by stripping a given suffix (domain) from |
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-- the name |
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computeAlias :: String -> a -> a |
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computeAlias dom e = setAlias e alias |
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where alias = take (length name - length dom) name |
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name = nameOf e |
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-- | Updates the index of the element |
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setIdx :: a -> Int -> a |
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-- | The iallocator node-evacuate evac_mode type. |
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$(THH.declareSADT "EvacMode" |
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[ ("ChangePrimary", 'C.iallocatorNevacPri) |
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, ("ChangeSecondary", 'C.iallocatorNevacSec) |
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, ("ChangeAll", 'C.iallocatorNevacAll) |
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]) |
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$(THH.makeJSONInstance ''EvacMode) |