root / src / Ganeti / DataCollectors / Lv.hs @ 820ca72d
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{-| Logical Volumes data collector. |
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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.DataCollectors.Lv |
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( main |
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, options |
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, arguments |
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, dcName |
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, dcVersion |
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, dcFormatVersion |
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, dcCategory |
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, dcKind |
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, dcReport |
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) where |
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import qualified Control.Exception as E |
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import Control.Monad |
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import Data.Attoparsec.Text.Lazy as A |
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import Data.List |
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import Data.Text.Lazy (pack, unpack) |
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import Network.BSD (getHostName) |
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import System.Process |
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import qualified Text.JSON as J |
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import qualified Ganeti.BasicTypes as BT |
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import Ganeti.Common |
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import Ganeti.Confd.ClientFunctions |
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import Ganeti.DataCollectors.CLI |
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import Ganeti.DataCollectors.Types |
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import Ganeti.JSON |
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import Ganeti.Objects |
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import Ganeti.Storage.Lvm.LVParser |
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import Ganeti.Storage.Lvm.Types |
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import Ganeti.Utils |
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-- | The default setting for the maximum amount of not parsed character to |
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-- print in case of error. |
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-- It is set to use most of the screen estate on a standard 80x25 terminal. |
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-- TODO: add the possibility to set this with a command line parameter. |
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defaultCharNum :: Int |
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defaultCharNum = 80*20 |
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-- | The name of this data collector. |
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dcName :: String |
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dcName = "lv" |
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-- | The version of this data collector. |
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dcVersion :: DCVersion |
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dcVersion = DCVerBuiltin |
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-- | The version number for the data format of this data collector. |
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dcFormatVersion :: Int |
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dcFormatVersion = 1 |
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-- | The category of this data collector. |
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dcCategory :: Maybe DCCategory |
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dcCategory = Just DCStorage |
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-- | The kind of this data collector. |
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dcKind :: DCKind |
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dcKind = DCKPerf |
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-- | The data exported by the data collector, taken from the default location. |
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dcReport :: IO DCReport |
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dcReport = buildDCReport defaultOptions |
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-- * Command line options |
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options :: IO [OptType] |
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options = |
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return |
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[ oInputFile |
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, oConfdAddr |
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, oConfdPort |
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, oInstances |
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] |
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-- | The list of arguments supported by the program. |
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arguments :: [ArgCompletion] |
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arguments = [ArgCompletion OptComplFile 0 (Just 0)] |
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-- | Get information about logical volumes from file (if specified) or |
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-- by actually running the command to get it from a live cluster. |
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getLvInfo :: Maybe FilePath -> IO [LVInfo] |
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getLvInfo inputFile = do |
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let cmd = lvCommand |
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params = lvParams |
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fromLvs = |
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((E.try $ readProcess cmd params "") :: IO (Either IOError String)) >>= |
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exitIfBad "running command" . either (BT.Bad . show) BT.Ok |
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contents <- |
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maybe fromLvs (\fn -> ((E.try $ readFile fn) :: IO (Either IOError String)) |
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>>= exitIfBad "reading from file" . either (BT.Bad . show) BT.Ok) |
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inputFile |
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case A.parse lvParser $ pack contents of |
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A.Fail unparsedText contexts errorMessage -> exitErr $ |
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show (Prelude.take defaultCharNum $ unpack unparsedText) ++ "\n" |
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++ show contexts ++ "\n" ++ errorMessage |
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A.Done _ lvinfoD -> return lvinfoD |
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-- | Get the list of instances on the current node (both primary and secondary) |
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-- either from a provided file or by querying Confd. |
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getInstanceList :: Options -> IO ([Instance], [Instance]) |
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getInstanceList opts = do |
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let srvAddr = optConfdAddr opts |
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srvPort = optConfdPort opts |
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instFile = optInstances opts |
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fromConfdUnchecked :: IO (BT.Result ([Instance], [Instance])) |
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fromConfdUnchecked = getHostName >>= \n -> getInstances n srvAddr srvPort |
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fromConfd :: IO (BT.Result ([Instance], [Instance])) |
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fromConfd = |
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liftM (either (BT.Bad . show) id) (E.try fromConfdUnchecked :: |
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IO (Either IOError (BT.Result ([Instance], [Instance])))) |
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fromFile :: FilePath -> IO (BT.Result ([Instance], [Instance])) |
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fromFile inputFile = do |
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contents <- |
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((E.try $ readFile inputFile) :: IO (Either IOError String)) |
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>>= exitIfBad "reading from file" . either (BT.Bad . show) BT.Ok |
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return . fromJResult "Not a list of instances" $ J.decode contents |
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instances <- maybe fromConfd fromFile instFile |
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exitIfBad "Unable to obtain the list of instances" instances |
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-- | Adds the name of the instance to the information about one logical volume. |
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addInstNameToOneLv :: [Instance] -> LVInfo -> LVInfo |
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addInstNameToOneLv instances lvInfo = |
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let vg_name = lviVgName lvInfo |
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lv_name = lviName lvInfo |
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instanceHasDisk = any (includesLogicalId vg_name lv_name) . instDisks |
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rightInstance = find instanceHasDisk instances |
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in |
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case rightInstance of |
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Nothing -> lvInfo |
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Just i -> lvInfo { lviInstance = Just $ instName i } |
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-- | Adds the name of the instance to the information about logical volumes. |
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addInstNameToLv :: [Instance] -> [LVInfo] -> [LVInfo] |
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addInstNameToLv instances = map (addInstNameToOneLv instances) |
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-- | This function computes the JSON representation of the LV status. |
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buildJsonReport :: Options -> IO J.JSValue |
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buildJsonReport opts = do |
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let inputFile = optInputFile opts |
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lvInfo <- getLvInfo inputFile |
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(prim, sec) <- getInstanceList opts |
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return . J.showJSON $ addInstNameToLv (prim ++ sec) lvInfo |
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-- | This function computes the DCReport for the logical volumes. |
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buildDCReport :: Options -> IO DCReport |
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buildDCReport opts = |
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buildJsonReport opts >>= |
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buildReport dcName dcVersion dcFormatVersion dcCategory dcKind |
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-- | Main function. |
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main :: Options -> [String] -> IO () |
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main opts args = do |
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unless (null args) . exitErr $ "This program takes exactly zero" ++ |
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" arguments, got '" ++ unwords args ++ "'" |
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report <- buildDCReport opts |
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putStrLn $ J.encode report |