root / src / Ganeti / Query / Common.hs @ 5b0ec494
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{-| Implementation of the Ganeti Query2 common objects. |
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-} |
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{- |
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Copyright (C) 2012, 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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|
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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.Query.Common |
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( rsNoData |
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, rsUnavail |
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, rsNormal |
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, rsMaybeNoData |
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, rsMaybeUnavail |
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, rsUnknown |
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, missingRuntime |
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, rpcErrorToStatus |
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, timeStampFields |
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, uuidFields |
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, serialFields |
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, tagsFields |
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, dictFieldGetter |
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, buildQFTLookup |
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, buildNdParamField |
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) where |
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import qualified Data.Map as Map |
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import Data.Maybe (fromMaybe) |
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import Text.JSON (JSON, showJSON) |
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import qualified Ganeti.Constants as C |
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import Ganeti.Config |
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import Ganeti.Objects |
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import Ganeti.Rpc |
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import Ganeti.Query.Language |
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import Ganeti.Query.Types |
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|
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-- * Generic functions |
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-- | Conversion from 'VType' to 'FieldType'. |
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vTypeToQFT :: VType -> FieldType |
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vTypeToQFT VTypeString = QFTOther |
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vTypeToQFT VTypeMaybeString = QFTOther |
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vTypeToQFT VTypeBool = QFTBool |
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vTypeToQFT VTypeSize = QFTUnit |
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vTypeToQFT VTypeInt = QFTNumber |
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|
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-- * Result helpers |
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-- | Helper for a result with no data. |
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rsNoData :: ResultEntry |
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rsNoData = ResultEntry RSNoData Nothing |
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-- | Helper for result for an entity which supports no such field. |
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rsUnavail :: ResultEntry |
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rsUnavail = ResultEntry RSUnavail Nothing |
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-- | Helper to declare a normal result. |
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rsNormal :: (JSON a) => a -> ResultEntry |
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rsNormal a = ResultEntry RSNormal $ Just (showJSON a) |
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-- | Helper to declare a result from a 'Maybe' (the item might be |
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-- missing, in which case we return no data). Note that there's some |
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-- ambiguity here: in some cases, we mean 'RSNoData', but in other |
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-- 'RSUnavail'; this is easy to solve in simple cases, but not in |
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-- nested dicts. If you want to return 'RSUnavail' in case of 'Nothing' |
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-- use the function 'rsMaybeUnavail'. |
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rsMaybeNoData :: (JSON a) => Maybe a -> ResultEntry |
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rsMaybeNoData = maybe rsNoData rsNormal |
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-- | Helper to declare a result from a 'Maybe'. This version returns |
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-- a 'RSUnavail' in case of 'Nothing'. It should be used for optional |
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-- fields that are not set. For cases where 'Nothing' means that there |
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-- was an error, consider using 'rsMaybe' instead. |
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rsMaybeUnavail :: (JSON a) => Maybe a -> ResultEntry |
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rsMaybeUnavail = maybe rsUnavail rsNormal |
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-- | Helper for unknown field result. |
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rsUnknown :: ResultEntry |
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rsUnknown = ResultEntry RSUnknown Nothing |
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-- | Helper for a missing runtime parameter. |
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missingRuntime :: FieldGetter a b |
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missingRuntime = FieldRuntime (\_ _ -> ResultEntry RSNoData Nothing) |
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-- * Error conversion |
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-- | Convert RpcError to ResultStatus |
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rpcErrorToStatus :: RpcError -> ResultStatus |
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rpcErrorToStatus OfflineNodeError = RSOffline |
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rpcErrorToStatus _ = RSNoData |
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-- * Common fields |
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-- | The list of timestamp fields. |
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timeStampFields :: (TimeStampObject a) => FieldList a b |
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timeStampFields = |
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[ (FieldDefinition "ctime" "CTime" QFTTimestamp "Creation timestamp", |
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FieldSimple (rsNormal . cTimeOf), QffNormal) |
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, (FieldDefinition "mtime" "MTime" QFTTimestamp "Modification timestamp", |
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FieldSimple (rsNormal . mTimeOf), QffNormal) |
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] |
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-- | The list of UUID fields. |
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uuidFields :: (UuidObject a) => String -> FieldList a b |
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uuidFields name = |
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[ (FieldDefinition "uuid" "UUID" QFTText (name ++ " UUID"), |
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FieldSimple (rsNormal . uuidOf), QffNormal) ] |
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-- | The list of serial number fields. |
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serialFields :: (SerialNoObject a) => String -> FieldList a b |
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serialFields name = |
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[ (FieldDefinition "serial_no" "SerialNo" QFTNumber |
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(name ++ " object serial number, incremented on each modification"), |
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FieldSimple (rsNormal . serialOf), QffNormal) ] |
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-- | The list of tag fields. |
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tagsFields :: (TagsObject a) => FieldList a b |
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tagsFields = |
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[ (FieldDefinition "tags" "Tags" QFTOther "Tags", |
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FieldSimple (rsNormal . tagsOf), QffNormal) ] |
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-- * Generic parameter functions |
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-- | Returns a field from a (possibly missing) 'DictObject'. This is |
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-- used by parameter dictionaries, usually. Note that we have two |
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-- levels of maybe: the top level dict might be missing, or one key in |
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-- the dictionary might be. |
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dictFieldGetter :: (DictObject a) => String -> Maybe a -> ResultEntry |
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dictFieldGetter k = maybe rsNoData (rsMaybeNoData . lookup k . toDict) |
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-- | Build an optimised lookup map from a Python _PARAMETER_TYPES |
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-- association list. |
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buildQFTLookup :: [(String, String)] -> Map.Map String FieldType |
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buildQFTLookup = |
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Map.fromList . |
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map (\(k, v) -> (k, maybe QFTOther vTypeToQFT (vTypeFromRaw v))) |
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-- | Ndparams optimised lookup map. |
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ndParamTypes :: Map.Map String FieldType |
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ndParamTypes = buildQFTLookup C.ndsParameterTypes |
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-- | Ndparams title map. |
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ndParamTitles :: Map.Map String FieldTitle |
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ndParamTitles = Map.fromList C.ndsParameterTitles |
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-- | Ndparam getter builder: given a field, it returns a FieldConfig |
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-- getter, that is a function that takes the config and the object and |
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-- returns the Ndparam field specified when the getter was built. |
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ndParamGetter :: (NdParamObject a) => |
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String -- ^ The field we're building the getter for |
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-> ConfigData -> a -> ResultEntry |
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ndParamGetter field config = |
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dictFieldGetter field . getNdParamsOf config |
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-- | Builds the ndparam fields for an object. |
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buildNdParamField :: (NdParamObject a) => String -> FieldData a b |
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buildNdParamField field = |
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let full_name = "ndp/" ++ field |
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title = fromMaybe field $ field `Map.lookup` ndParamTitles |
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qft = fromMaybe QFTOther $ field `Map.lookup` ndParamTypes |
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desc = "The \"" ++ field ++ "\" node parameter" |
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in (FieldDefinition full_name title qft desc, |
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FieldConfig (ndParamGetter field), QffNormal) |