root / src / Ganeti / Hypervisor / Xen / Types.hs @ b8585908
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{-# LANGUAGE FlexibleInstances, TypeSynonymInstances #-} |
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{-| Data types for Xen-specific hypervisor functionalities. |
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|
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-} |
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{- |
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Copyright (C) 2013 Google Inc. |
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|
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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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-} |
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module Ganeti.Hypervisor.Xen.Types |
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( LispConfig(..) |
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, Domain(..) |
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, FromLispConfig(..) |
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, ActualState(..) |
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) where |
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|
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import qualified Text.JSON as J |
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import Ganeti.BasicTypes |
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-- | Data type representing configuration data as produced by the |
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-- @xm list --long@ command. |
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data LispConfig = LCList [LispConfig] |
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| LCString String |
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| LCDouble Double |
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deriving (Eq, Show) |
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|
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-- | Data type representing a Xen Domain. |
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data Domain = Domain |
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{ domId :: Int |
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, domName :: String |
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, domCpuTime :: Double |
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, domState :: ActualState |
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, domIsHung :: Maybe Bool |
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} deriving (Show, Eq) |
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|
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-- | Class representing all the types that can be extracted from LispConfig. |
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class FromLispConfig a where |
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fromLispConfig :: LispConfig -> Result a |
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-- | Instance of FromLispConfig for Int. |
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instance FromLispConfig Int where |
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fromLispConfig (LCDouble d) = Ok $ floor d |
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fromLispConfig (LCList (LCString _:LCDouble d:[])) = Ok $ floor d |
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fromLispConfig c = |
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Bad $ "Unable to extract a Int from this configuration: " |
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++ show c |
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|
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-- | Instance of FromLispConfig for Double. |
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instance FromLispConfig Double where |
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fromLispConfig (LCDouble d) = Ok d |
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fromLispConfig (LCList (LCString _:LCDouble d:[])) = Ok d |
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fromLispConfig c = |
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Bad $ "Unable to extract a Double from this configuration: " |
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++ show c |
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|
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-- | Instance of FromLispConfig for String |
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instance FromLispConfig String where |
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fromLispConfig (LCString s) = Ok s |
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fromLispConfig (LCList (LCString _:LCString s:[])) = Ok s |
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fromLispConfig c = |
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Bad $ "Unable to extract a String from this configuration: " |
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++ show c |
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|
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-- | Instance of FromLispConfig for [LispConfig] |
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instance FromLispConfig [LispConfig] where |
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fromLispConfig (LCList l) = Ok l |
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fromLispConfig c = |
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Bad $ "Unable to extract a List from this configuration: " |
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++ show c |
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|
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data ActualState = ActualRunning -- ^ The instance is running |
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| ActualBlocked -- ^ The instance is not running or runnable |
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| ActualPaused -- ^ The instance has been paused |
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| ActualShutdown -- ^ The instance is shut down |
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| ActualCrashed -- ^ The instance has crashed |
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| ActualDying -- ^ The instance is in process of dying |
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| ActualHung -- ^ The instance is hung |
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| ActualUnknown -- ^ Unknown state. Parsing error. |
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deriving (Show, Eq) |
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|
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instance J.JSON ActualState where |
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showJSON ActualRunning = J.showJSON "running" |
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showJSON ActualBlocked = J.showJSON "blocked" |
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showJSON ActualPaused = J.showJSON "paused" |
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showJSON ActualShutdown = J.showJSON "shutdown" |
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showJSON ActualCrashed = J.showJSON "crashed" |
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showJSON ActualDying = J.showJSON "dying" |
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showJSON ActualHung = J.showJSON "hung" |
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showJSON ActualUnknown = J.showJSON "unknown" |
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readJSON = error "JSON read instance not implemented for type ActualState" |