Revision 2e5eb96a

b/htools/Ganeti/HTools/Types.hs
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{-
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Copyright (C) 2009, 2010 Google Inc.
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Copyright (C) 2009, 2010, 2011 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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import qualified Data.Map as M
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import qualified Text.JSON as JSON
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import qualified Ganeti.Constants as C
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-- | The instance index type.
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type Idx = Int
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-- | Convert a string to an alloc policy
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apolFromString :: (Monad m) => String -> m AllocPolicy
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apolFromString s =
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    case s of
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      "preferred"   -> return AllocPreferred
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      "last_resort" -> return AllocLastResort
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      "unallocable" -> return AllocUnallocable
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      o -> fail $ "Invalid alloc policy mode: " ++ o
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    case () of
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      _ | s == C.allocPolicyPreferred -> return AllocPreferred
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        | s == C.allocPolicyLastResort -> return AllocLastResort
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        | s == C.allocPolicyUnallocable -> return AllocUnallocable
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        | otherwise -> fail $ "Invalid alloc policy mode: " ++ s
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-- | Convert an alloc policy to the Ganeti string equivalent
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apolToString :: AllocPolicy -> String
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apolToString AllocPreferred   = "preferred"
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apolToString AllocLastResort  = "last_resort"
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apolToString AllocUnallocable = "unallocable"
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apolToString AllocPreferred   = C.allocPolicyPreferred
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apolToString AllocLastResort  = C.allocPolicyLastResort
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apolToString AllocUnallocable = C.allocPolicyUnallocable
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instance JSON.JSON AllocPolicy where
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    showJSON = JSON.showJSON . apolToString

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