root / htools / Ganeti / Ssconf.hs @ 256e28c4
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{-# LANGUAGE TemplateHaskell #-} |
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{-| Implementation of the Ganeti Ssconf interface. |
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-} |
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{- |
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Copyright (C) 2012 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.Ssconf |
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( SSKey(..) |
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, sSKeyToRaw |
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, sSKeyFromRaw |
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, getPrimaryIPFamily |
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, keyToFilename |
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, sSFilePrefix |
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) where |
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import Ganeti.THH |
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import Control.Exception |
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import Control.Monad (liftM) |
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import Data.Maybe (fromMaybe) |
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import qualified Network.Socket as Socket |
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import System.FilePath ((</>)) |
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import System.IO.Error (isDoesNotExistError) |
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import qualified Ganeti.Constants as C |
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import qualified Ganeti.Path as Path |
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import Ganeti.BasicTypes |
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import Ganeti.Utils |
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-- | Maximum ssconf file size we support. |
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maxFileSize :: Int |
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maxFileSize = 131072 |
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-- | ssconf file prefix, re-exported from Constants. |
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sSFilePrefix :: FilePath |
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sSFilePrefix = C.ssconfFileprefix |
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$(declareSADT "SSKey" |
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[ ("SSClusterName", 'C.ssClusterName) |
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, ("SSClusterTags", 'C.ssClusterTags) |
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, ("SSFileStorageDir", 'C.ssFileStorageDir) |
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, ("SSSharedFileStorageDir", 'C.ssSharedFileStorageDir) |
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, ("SSMasterCandidates", 'C.ssMasterCandidates) |
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, ("SSMasterCandidatesIps", 'C.ssMasterCandidatesIps) |
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, ("SSMasterIp", 'C.ssMasterIp) |
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, ("SSMasterNetdev", 'C.ssMasterNetdev) |
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, ("SSMasterNetmask", 'C.ssMasterNetmask) |
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, ("SSMasterNode", 'C.ssMasterNode) |
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, ("SSNodeList", 'C.ssNodeList) |
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, ("SSNodePrimaryIps", 'C.ssNodePrimaryIps) |
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, ("SSNodeSecondaryIps", 'C.ssNodeSecondaryIps) |
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, ("SSOfflineNodes", 'C.ssOfflineNodes) |
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, ("SSOnlineNodes", 'C.ssOnlineNodes) |
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, ("SSPrimaryIpFamily", 'C.ssPrimaryIpFamily) |
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, ("SSInstanceList", 'C.ssInstanceList) |
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, ("SSReleaseVersion", 'C.ssReleaseVersion) |
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, ("SSHypervisorList", 'C.ssHypervisorList) |
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, ("SSMaintainNodeHealth", 'C.ssMaintainNodeHealth) |
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, ("SSUidPool", 'C.ssUidPool) |
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, ("SSNodegroups", 'C.ssNodegroups) |
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]) |
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-- | Convert a ssconf key into a (full) file path. |
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keyToFilename :: FilePath -- ^ Config path root |
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-> SSKey -- ^ Ssconf key |
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-> FilePath -- ^ Full file name |
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keyToFilename cfgpath key = |
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cfgpath </> sSFilePrefix ++ sSKeyToRaw key |
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-- | Runs an IO action while transforming any error into 'Bad' |
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-- values. It also accepts an optional value to use in case the error |
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-- is just does not exist. |
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catchIOErrors :: Maybe a -- ^ Optional default |
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-> IO a -- ^ Action to run |
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-> IO (Result a) |
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catchIOErrors def action = |
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Control.Exception.catch |
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(do |
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result <- action |
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return (Ok result) |
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) (\err -> let bad_result = Bad (show err) |
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in return $ if isDoesNotExistError err |
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then maybe bad_result Ok def |
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else bad_result) |
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-- | Read an ssconf file. |
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readSSConfFile :: Maybe FilePath -- ^ Optional config path override |
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-> Maybe String -- ^ Optional default value |
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-> SSKey -- ^ Desired ssconf key |
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-> IO (Result String) |
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readSSConfFile optpath def key = do |
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dpath <- Path.dataDir |
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result <- catchIOErrors def . readFile . |
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keyToFilename (fromMaybe dpath optpath) $ key |
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return (liftM (take maxFileSize) result) |
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-- | Parses a string containing an IP family |
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parseIPFamily :: Int -> Result Socket.Family |
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parseIPFamily fam | fam == C.ip4Family = Ok Socket.AF_INET |
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| fam == C.ip6Family = Ok Socket.AF_INET6 |
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| otherwise = Bad $ "Unknown af_family value: " ++ show fam |
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-- | Read the primary IP family. |
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getPrimaryIPFamily :: Maybe FilePath -> IO (Result Socket.Family) |
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getPrimaryIPFamily optpath = do |
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result <- readSSConfFile optpath (Just (show C.ip4Family)) SSPrimaryIpFamily |
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return (liftM rStripSpace result >>= |
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tryRead "Parsing af_family" >>= parseIPFamily) |