summaryrefslogtreecommitdiffhomepage
path: root/src/Plugins/Monitors/Net.hs
blob: 170da076da14217637001ffdd05a7cea5c2062a6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
-----------------------------------------------------------------------------
-- |
-- Module      :  Plugins.Monitors.Net
-- Copyright   :  (c) 2011, 2012 Jose Antonio Ortega Ruiz
--                (c) 2007-2010 Andrea Rossato
-- License     :  BSD-style (see LICENSE)
--
-- Maintainer  :  Jose A. Ortega Ruiz <jao@gnu.org>
-- Stability   :  unstable
-- Portability :  unportable
--
-- A net device monitor for Xmobar
--
-----------------------------------------------------------------------------

module Plugins.Monitors.Net (
                        startNet
                      , startDynNet
                      ) where

import Plugins.Monitors.Common

import Data.IORef (IORef, newIORef, readIORef, writeIORef)
import Data.Time.Clock (UTCTime, getCurrentTime, diffUTCTime)
import Control.Monad (forM, filterM, liftM)

import qualified Data.ByteString.Lazy.Char8 as B

data NetDev = NA
            | NI String
            | ND String Float Float deriving (Eq,Show,Read)

type NetDevRef = IORef (NetDev, UTCTime)

{- The more information available, the better.
 - Note that names don't matter. Therefore, if only the names differ,
 - a compare evaluates to EQ while (==) evaluates to False.
 -}
instance Ord NetDev where
    compare NA NA              = EQ
    compare NA _               = LT
    compare _  NA              = GT
    compare (NI _) (NI _)      = EQ
    compare (NI _) (ND _ _ _)  = LT
    compare (ND _ _ _) (NI _)  = GT
    compare (ND _ x1 y1) (ND _ x2 y2) =
        if downcmp /= EQ
           then downcmp
           else y1 `compare` y2
      where downcmp = x1 `compare` x2

netConfig :: IO MConfig
netConfig = mkMConfig
    "<dev>: <rx>KB|<tx>KB"      -- template
    ["dev", "rx", "tx", "rxbar", "txbar"]     -- available replacements

isUp :: String -> IO Bool
isUp d = do
  operstate <- B.readFile $ "/sys/class/net/" ++ d ++ "/operstate"
  return $ "up" == (B.unpack . head . B.lines) operstate

readNetDev :: [String] -> IO NetDev
readNetDev (d:x:y:_) = do
  up <- isUp d
  return (if up then ND d (r x) (r y) else NI d)
    where r s | s == "" = 0
              | otherwise = read s / 1024

readNetDev _ = return NA

netParser :: B.ByteString -> IO [NetDev]
netParser = mapM (readNetDev . splitDevLine) . readDevLines
  where readDevLines = drop 2 . B.lines
        splitDevLine = selectCols . wordsBy (`elem` " :") . B.unpack
        selectCols cols = map (cols!!) [0,1,9]
        wordsBy f s = case dropWhile f s of
          [] -> []
          s' -> w : wordsBy f s'' where (w, s'') = break f s'

findNetDev :: String -> IO NetDev
findNetDev dev = do
  nds <- B.readFile "/proc/net/dev" >>= netParser
  case filter isDev nds of
    x:_ -> return x
    _ -> return NA
  where isDev (ND d _ _) = d == dev
        isDev (NI d) = d == dev
        isDev NA = False

formatNet :: Float -> Monitor (String, String)
formatNet d = do
    s <- getConfigValue useSuffix
    dd <- getConfigValue decDigits
    let str = if s then (++"Kb/s") . showDigits dd else showDigits dd
    b <- showLogBar 0.9 d
    x <- showWithColors str d
    return (x, b)

printNet :: NetDev -> Monitor String
printNet nd =
  case nd of
    ND d r t -> do
        (rx, rb) <- formatNet r
        (tx, tb) <- formatNet t
        parseTemplate [d,rx,tx,rb,tb]
    NI _ -> return ""
    NA -> return "N/A"

parseNet :: NetDevRef -> String -> IO NetDev
parseNet nref nd = do
  (n0, t0) <- readIORef nref
  n1 <- findNetDev nd
  t1 <- getCurrentTime
  writeIORef nref (n1, t1)
  let scx = realToFrac (diffUTCTime t1 t0)
      scx' = if scx > 0 then scx else 1
      rate da db = takeDigits 2 $ (db - da) / scx'
      diffRate (ND d ra ta) (ND _ rb tb) = ND d (rate ra rb) (rate ta tb)
      diffRate (NI d) _ = NI d
      diffRate _ (NI d) = NI d
      diffRate _ _ = NA
  return $ diffRate n0 n1

runNet :: NetDevRef -> String -> [String] -> Monitor String
runNet nref i _ = io (parseNet nref i) >>= printNet

parseNets :: [(NetDevRef, String)] -> IO [NetDev]
parseNets = mapM (\(ref, i) -> parseNet ref i)

runNets :: [(NetDevRef, String)] -> [String] -> Monitor String
runNets refs _ = io (parseActive refs) >>= printNet
    where parseActive refs = parseNets refs >>= return . selectActive

selectActive :: [NetDev] -> NetDev
selectActive = maximum
                   
startNet :: String -> [String] -> Int -> (String -> IO ()) -> IO ()
startNet i a r cb = do
  t0 <- getCurrentTime
  nref <- newIORef (NA, t0)
  _ <- parseNet nref i
  runM a netConfig (runNet nref i) r cb

startDynNet :: [String] -> [String] -> Int -> (String -> IO ()) -> IO ()
startDynNet is a r cb = do
  refs <- forM is $ \i -> do
            t <- getCurrentTime
            nref <- newIORef (NA, t)
            _ <- parseNet nref i
            return (nref, i)
  runM a netConfig (runNets refs) r cb

-- TODO: Prelude.head: empty list