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root / src / Ganeti / Storage / Utils.hs @ 00839a42

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{-| Implementation of Utility functions for storage
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 -}
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{-
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Copyright (C) 2013 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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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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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.Storage.Utils
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  ( getClusterStorageUnits
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  ) where
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import Ganeti.Objects
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import Ganeti.Types
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import qualified Ganeti.Types as T
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type StorageUnit = (StorageType, String)
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-- | Get the cluster's default storage unit for a given disk template
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getDefaultStorageKey :: ConfigData -> DiskTemplate -> Maybe String
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getDefaultStorageKey cfg T.DTDrbd8 = clusterVolumeGroupName $ configCluster cfg
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getDefaultStorageKey cfg T.DTPlain = clusterVolumeGroupName $ configCluster cfg
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getDefaultStorageKey cfg T.DTFile =
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    Just (clusterFileStorageDir $ configCluster cfg)
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getDefaultStorageKey cfg T.DTSharedFile =
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    Just (clusterSharedFileStorageDir $ configCluster cfg)
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getDefaultStorageKey _ _ = Nothing
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-- | Get the cluster's default spindle storage unit
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getDefaultSpindleSU :: ConfigData -> (StorageType, Maybe String)
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getDefaultSpindleSU cfg =
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    (T.StorageLvmPv, clusterVolumeGroupName $ configCluster cfg)
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-- | Get the cluster's storage units from the configuration
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getClusterStorageUnits :: ConfigData -> [StorageUnit]
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getClusterStorageUnits cfg = foldSUs (maybe_units ++ [spindle_unit])
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  where disk_templates = clusterEnabledDiskTemplates $ configCluster cfg
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        storage_types = map diskTemplateToStorageType disk_templates
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        maybe_units = zip storage_types (map (getDefaultStorageKey cfg)
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            disk_templates)
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        spindle_unit = getDefaultSpindleSU cfg
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-- | fold the storage unit list by sorting out the ones without keys
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foldSUs :: [(StorageType, Maybe String)] -> [StorageUnit]
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foldSUs = foldr ff []
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  where ff (st, Just sk) acc = (st, sk) : acc
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        ff (_, Nothing) acc = acc
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-- | Mapping fo disk templates to storage type
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-- FIXME: This is semantically the same as the constant
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-- C.diskTemplatesStorageType
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diskTemplateToStorageType :: DiskTemplate -> StorageType
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diskTemplateToStorageType T.DTExt = T.StorageExt
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diskTemplateToStorageType T.DTFile = T.StorageFile
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diskTemplateToStorageType T.DTSharedFile = T.StorageFile
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diskTemplateToStorageType T.DTDrbd8 = T.StorageLvmVg
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diskTemplateToStorageType T.DTPlain = T.StorageLvmVg
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diskTemplateToStorageType T.DTRbd = T.StorageRados
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diskTemplateToStorageType T.DTDiskless = T.StorageDiskless
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diskTemplateToStorageType T.DTBlock = T.StorageBlock