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{-| @/proc/stat@ 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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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.CPUload
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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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, dcUpdate
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) where
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import qualified Control.Exception as E
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import Data.Attoparsec.Text.Lazy as A
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import Data.Text.Lazy (pack, unpack)
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import qualified Text.JSON as J
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import qualified Data.Sequence as Seq
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import qualified Ganeti.BasicTypes as BT
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import qualified Ganeti.Constants as C
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import Ganeti.Cpu.LoadParser(cpustatParser)
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import Ganeti.DataCollectors.Types
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import Ganeti.Utils
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import Ganeti.Cpu.Types
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-- | The default path of the CPU status file.
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-- It is hardcoded because it is not likely to change.
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defaultFile :: FilePath
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defaultFile = C.statFile
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-- | The buffer size of the values kept in the map.
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bufferSize :: Int
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bufferSize = C.cpuavgloadBufferSize
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-- | The window size of the values that will export the average load.
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windowSize :: Integer
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windowSize = toInteger C.cpuavgloadWindowSize
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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 = "cpu-avg-load"
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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 = Nothing
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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 :: Maybe CollectorData -> IO DCReport
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dcReport colData =
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let cpuLoadData =
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case colData of
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Nothing -> Seq.empty
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Just colData' ->
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case colData' of
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CPULoadData v -> v
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in buildDCReport cpuLoadData
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-- | Data stored by the collector in mond's memory.
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type Buffer = Seq.Seq (Integer, [Int])
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-- | Compute the load from a CPU.
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computeLoad :: CPUstat -> Int
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computeLoad cpuData =
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csUser cpuData + csNice cpuData + csSystem cpuData
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+ csIowait cpuData + csIrq cpuData + csSoftirq cpuData
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+ csSteal cpuData + csGuest cpuData + csGuestNice cpuData
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-- | Reads and Computes the load for each CPU.
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dcCollectFromFile :: FilePath -> IO (Integer, [Int])
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dcCollectFromFile 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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cpustatData <-
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case A.parse cpustatParser $ 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 _ cpustatD -> return cpustatD
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now <- getCurrentTime
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let timestamp = now :: Integer
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return (timestamp, map computeLoad cpustatData)
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-- | Returns the collected data in the appropriate type.
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dcCollect :: IO Buffer
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dcCollect = do
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l <- dcCollectFromFile defaultFile
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return (Seq.singleton l)
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-- | Formats data for JSON transformation.
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formatData :: [Double] -> CPUavgload
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formatData [] = CPUavgload (0 :: Int) [] (0 :: Double)
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formatData l@(x:xs) = CPUavgload (length l - 1) xs x
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-- | Update a Map Entry.
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updateEntry :: Buffer -> Buffer -> Buffer
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updateEntry newBuffer mapEntry =
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(Seq.><) newBuffer
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(if Seq.length mapEntry < bufferSize
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then mapEntry
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else Seq.drop 1 mapEntry)
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-- | Updates the given Collector data.
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dcUpdate :: Maybe CollectorData -> IO CollectorData
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dcUpdate mcd = do
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v <- dcCollect
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let new_v =
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case mcd of
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Nothing -> v
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Just cd ->
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case cd of
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CPULoadData old_v -> updateEntry v old_v
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new_v `seq` return $ CPULoadData new_v
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-- | Computes the average load for every CPU and the overall from data read
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-- from the map.
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computeAverage :: Buffer -> Integer -> [Double]
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computeAverage s w =
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let window = Seq.takeWhileL ((> w) . fst) s
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go Seq.EmptyL _ = []
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go _ Seq.EmptyR = []
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go (leftmost Seq.:< _) (_ Seq.:> rightmost) = do
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let (timestampL, listL) = leftmost
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(timestampR, listR) = rightmost
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work = zipWith (-) listL listR
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overall = (timestampL - timestampR) * 100
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map (\x -> fromIntegral x / fromIntegral overall) work
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in go (Seq.viewl window) (Seq.viewr window)
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-- | This function computes the JSON representation of the CPU load.
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buildJsonReport :: Buffer -> IO J.JSValue
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buildJsonReport v =
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let res = computeAverage v windowSize
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in return . J.showJSON $ formatData res
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-- | This function computes the DCReport for the CPU load.
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buildDCReport :: Buffer -> IO DCReport
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buildDCReport v =
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buildJsonReport v >>=
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buildReport dcName dcVersion dcFormatVersion dcCategory dcKind
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