root / src / Ganeti / Query / Export.hs @ d5665e10
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{-| Implementation of the Ganeti Query2 export queries. |
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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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|
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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.Export |
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( Runtime |
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, fieldsMap |
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, collectLiveData |
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) where |
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import Control.Monad (liftM) |
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import qualified Data.Map as Map |
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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.Common |
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import Ganeti.Query.Types |
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-- | The parsed result of the ExportList. This is a bit tricky, in |
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-- that we already do parsing of the results in the RPC calls, so the |
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-- runtime type is a plain 'ResultEntry', as we have just one type. |
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type Runtime = ResultEntry |
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-- | Small helper for rpc to rs. |
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rpcErrToRs :: RpcError -> ResultEntry |
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rpcErrToRs err = ResultEntry (rpcErrorToStatus err) Nothing |
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-- | Helper for extracting fields from RPC result. |
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rpcExtractor :: Node -> Either RpcError RpcResultExportList |
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-> [(Node, ResultEntry)] |
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rpcExtractor node (Right res) = |
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[(node, rsNormal path) | path <- rpcResExportListExports res] |
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rpcExtractor node (Left err) = [(node, rpcErrToRs err)] |
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-- | List of all node fields. |
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exportFields :: FieldList Node Runtime |
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exportFields = |
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[ (FieldDefinition "node" "Node" QFTText "Node name", |
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FieldRuntime (\_ n -> rsNormal $ nodeName n), QffHostname) |
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, (FieldDefinition "export" "Export" QFTText "Export name", |
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FieldRuntime (curry fst), QffNormal) |
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] |
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-- | The node fields map. |
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fieldsMap :: FieldMap Node Runtime |
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fieldsMap = |
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Map.fromList $ map (\v@(f, _, _) -> (fdefName f, v)) exportFields |
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-- | Collect live data from RPC query if enabled. |
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-- |
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-- Note that this function is \"funny\": the returned rows will not be |
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-- 1:1 with the input, as nodes without exports will be pruned, |
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-- whereas nodes with multiple exports will be listed multiple times. |
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collectLiveData:: Bool -> ConfigData -> [Node] -> IO [(Node, Runtime)] |
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collectLiveData False _ nodes = |
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return [(n, rpcErrToRs $ RpcResultError "Live data disabled") | n <- nodes] |
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collectLiveData True _ nodes = |
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concatMap (uncurry rpcExtractor) `liftM` |
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executeRpcCall nodes RpcCallExportList |