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|
-----------------------------------------------------------------------------
-- |
-- Module : Plugins.Monitors.Disk
-- Copyright : (c) 2010, 2011, 2012 Jose A Ortega Ruiz
-- License : BSD-style (see LICENSE)
--
-- Maintainer : Jose A Ortega Ruiz <jao@gnu.org>
-- Stability : unstable
-- Portability : unportable
--
-- Disk usage and throughput monitors for Xmobar
--
-----------------------------------------------------------------------------
module Plugins.Monitors.Disk (diskUConfig, runDiskU, startDiskIO) where
import Plugins.Monitors.Common
import StatFS
import Data.IORef (IORef, newIORef, readIORef, writeIORef)
import Control.Exception (SomeException, handle)
import Control.Monad (zipWithM)
import qualified Data.ByteString.Lazy.Char8 as B
import Data.List (isPrefixOf, find)
import Data.Maybe (catMaybes)
import System.Directory (canonicalizePath, doesFileExist)
diskIOConfig :: IO MConfig
diskIOConfig = mkMConfig "" ["total", "read", "write",
"totalbar", "readbar", "writebar"]
diskUConfig :: IO MConfig
diskUConfig = mkMConfig ""
["size", "free", "used", "freep", "usedp", "freebar", "usedbar"]
type DevName = String
type Path = String
type DevDataRef = IORef [(DevName, [Float])]
mountedDevices :: [String] -> IO [(DevName, Path)]
mountedDevices req = do
s <- B.readFile "/etc/mtab"
parse `fmap` mapM mbcanon (devs s)
where
mbcanon (d, p) = doesFileExist d >>= \e ->
if e
then Just `fmap` canon (d,p)
else return Nothing
canon (d, p) = do {d' <- canonicalizePath d; return (d', p)}
devs = filter isDev . map (firstTwo . B.words) . B.lines
parse = map undev . filter isReq . catMaybes
firstTwo (a:b:_) = (B.unpack a, B.unpack b)
firstTwo _ = ("", "")
isDev (d, _) = "/dev/" `isPrefixOf` d
isReq (d, p) = p `elem` req || drop 5 d `elem` req
undev (d, f) = (drop 5 d, f)
diskDevices :: [String] -> IO [(DevName, Path)]
diskDevices req = do
s <- B.readFile "/proc/diskstats"
parse `fmap` mapM canon (devs s)
where
canon (d, p) = do {d' <- canonicalizePath (d); return (d', p)}
devs = map (third . B.words) . B.lines
parse = map undev . filter isReq
third (_:_:c:_) = ("/dev/" ++ (B.unpack c), B.unpack c)
third _ = ("", "")
isReq (d, p) = p `elem` req || drop 5 d `elem` req
undev (d, f) = (drop 5 d, f)
mountedOrDiskDevices :: [String] -> IO [(DevName, Path)]
mountedOrDiskDevices req = do
mnt <- mountedDevices req
case mnt of
[] -> diskDevices req
other -> return other
diskData :: IO [(DevName, [Float])]
diskData = do
s <- B.readFile "/proc/diskstats"
let extract ws = (head ws, map read (tail ws))
return $ map (extract . map B.unpack . drop 2 . B.words) (B.lines s)
mountedData :: DevDataRef -> [DevName] -> IO [(DevName, [Float])]
mountedData dref devs = do
dt <- readIORef dref
dt' <- diskData
writeIORef dref dt'
return $ map (parseDev (zipWith diff dt' dt)) devs
where diff (dev, xs) (_, ys) = (dev, zipWith (-) xs ys)
parseDev :: [(DevName, [Float])] -> DevName -> (DevName, [Float])
parseDev dat dev =
case find ((==dev) . fst) dat of
Nothing -> (dev, [0, 0, 0])
Just (_, xs) ->
let rSp = speed (xs !! 2) (xs !! 3)
wSp = speed (xs !! 6) (xs !! 7)
sp = speed (xs !! 2 + xs !! 6) (xs !! 3 + xs !! 7)
speed x t = if t == 0 then 0 else 500 * x / t
dat' = if length xs > 6 then [sp, rSp, wSp] else [0, 0, 0]
in (dev, dat')
speedToStr :: Float -> String
speedToStr = showWithUnits 2 1
sizeToStr :: Integer -> String
sizeToStr = showWithUnits 3 0 . fromIntegral
findTempl :: DevName -> Path -> [(String, String)] -> String
findTempl dev path disks =
case find devOrPath disks of
Just (_, t) -> t
Nothing -> ""
where devOrPath (d, _) = d == dev || d == path
devTemplates :: [(String, String)]
-> [(DevName, Path)]
-> [(DevName, [Float])]
-> [(String, [Float])]
devTemplates disks mounted dat =
map (\(d, p) -> (findTempl d p disks, findData d)) mounted
where findData dev = case find ((==dev) . fst) dat of
Nothing -> [0, 0, 0]
Just (_, xs) -> xs
runDiskIO' :: (String, [Float]) -> Monitor String
runDiskIO' (tmp, xs) = do
s <- mapM (showWithColors speedToStr) xs
b <- mapM (showLogBar 0.8) xs
setConfigValue tmp template
parseTemplate $ s ++ b
runDiskIO :: DevDataRef -> [(String, String)] -> [String] -> Monitor String
runDiskIO dref disks _ = do
dev <- io $ mountedOrDiskDevices (map fst disks)
dat <- io $ mountedData dref (map fst dev)
strs <- mapM runDiskIO' $ devTemplates disks dev dat
return $ unwords strs
startDiskIO :: [(String, String)] ->
[String] -> Int -> (String -> IO ()) -> IO ()
startDiskIO disks args rate cb = do
dev <- mountedOrDiskDevices (map fst disks)
dref <- newIORef (map (\d -> (fst d, repeat 0)) dev)
_ <- mountedData dref (map fst dev)
runM args diskIOConfig (runDiskIO dref disks) rate cb
fsStats :: String -> IO [Integer]
fsStats path = do
stats <- getFileSystemStats path
case stats of
Nothing -> return [0, 0, 0]
Just f -> let tot = fsStatByteCount f
free = fsStatBytesAvailable f
used = fsStatBytesUsed f
in return [tot, free, used]
runDiskU' :: String -> String -> Monitor String
runDiskU' tmp path = do
setConfigValue tmp template
[total, free, diff] <- io (handle ign $ fsStats path)
let strs = map sizeToStr [total, free, diff]
freep = if total > 0 then free * 100 `div` total else 0
fr = fromIntegral freep / 100
s <- zipWithM showWithColors' strs [100, freep, 100 - freep]
sp <- showPercentsWithColors [fr, 1 - fr]
fb <- showPercentBar (fromIntegral freep) fr
ub <- showPercentBar (fromIntegral $ 100 - freep) (1 - fr)
parseTemplate $ s ++ sp ++ [fb, ub]
where ign = const (return [0, 0, 0]) :: SomeException -> IO [Integer]
runDiskU :: [(String, String)] -> [String] -> Monitor String
runDiskU disks _ = do
devs <- io $ mountedDevices (map fst disks)
strs <- mapM (\(d, p) -> runDiskU' (findTempl d p disks) p) devs
return $ unwords strs
|
