widgets/net.lua

   1
   2 --[[
   3
   4      Licensed under GNU General Public License v2
   5       * (c) 2013,      Luke Bonham
   6       * (c) 2010-2012, Peter Hofmann
   7
   8 --]]
   9
  10 local helpers      = require("lain.helpers")
  11 local naughty      = require("naughty")
  12 local wibox        = require("wibox")
  13 local string       = { format = string.format,
  14                        match  = string.match }
  15 local setmetatable = setmetatable
  16
  17 -- Network infos
  18 -- lain.widgets.net
  19
  20 local function worker(args)
  21     local net = helpers.make_widget_textbox()
  22     net.last_t = 0
  23     net.last_r = 0
  24     net.devices = {}
  25
  26     local args       = args or {}
  27     local timeout    = args.timeout or 2
  28     local units      = args.units or 1024 --kb
  29     local notify     = args.notify or "on"
  30     local screen     = args.screen or 1
  31     local settings   = args.settings or function() end
  32
  33     -- Compatibility with old API where iface was a string corresponding to 1 interface
  34     net.iface = (args.iface and type(args.iface) == "string" and {args.iface}) or {}
  35
  36     function net.get_device()
  37         helpers.async(string.format("ip link show", device_cmd), function(ws)
  38             ws = ws:match("(%w+): <BROADCAST,MULTICAST,.-UP,LOWER_UP>")
  39             net.iface = ws and { ws } or {}
  40         end)
  41     end
  42
  43     if #net.iface == 0 then net.get_device() end
  44
  45     function update()
  46         -- These are the totals over all specified interfaces
  47         net_now = {
  48             -- New api - Current state of requested devices
  49             devices  = {},
  50             -- Bytes since last iteration
  51             sent     = 0,
  52             received = 0
  53         }
  54
  55         -- Total bytes transfered
  56         local total_t = 0
  57         local total_r = 0
  58
  59         for i, dev in ipairs(net.iface) do
  60             local dev_now    = {}
  61             local dev_before = net.devices[dev] or { last_t = 0, last_r = 0 }
  62             local now_t      = tonumber(helpers.first_line(string.format("/sys/class/net/%s/statistics/tx_bytes", dev)) or 0)
  63             local now_r      = tonumber(helpers.first_line(string.format("/sys/class/net/%s/statistics/rx_bytes", dev)) or 0)
  64
  65             dev_now.carrier  = helpers.first_line(string.format("/sys/class/net/%s/carrier", dev)) or "0"
  66             dev_now.state    = helpers.first_line(string.format("/sys/class/net/%s/operstate", dev)) or "down"
  67
  68             dev_now.sent     = (now_t - dev_before.last_t) / timeout / units
  69             dev_now.received = (now_r - dev_before.last_r) / timeout / units
  70
  71             net_now.sent     = net_now.sent     + dev_now.sent
  72             net_now.received = net_now.received + dev_now.received
  73
  74             dev_now.sent     = string.format('%.1f', dev_now.sent)
  75             dev_now.received = string.format('%.1f', dev_now.received)
  76
  77             dev_now.last_t   = now_t
  78             dev_now.last_r   = now_r
  79
  80             -- This will become dev_before in the next update/iteration
  81             net.devices[dev] = dev_now
  82
  83             total_t  = total_t + now_t
  84             total_r  = total_r + now_r
  85
  86             -- Notify only once when connection is loss
  87             if string.match(dev_now.carrier, "0") and notify == "on" and helpers.get_map(dev) then
  88                 naughty.notify({
  89                     title    = dev,
  90                     text     = "no carrier",
  91                     icon     = helpers.icons_dir .. "no_net.png",
  92                     screen   = screen
  93                 })
  94                 helpers.set_map(dev, false)
  95             elseif string.match(dev_now.carrier, "1") then
  96                 helpers.set_map(dev, true)
  97             end
  98
  99             -- Old api compatibility
 100             net_now.carrier      = dev_now.carrier
 101             net_now.state        = dev_now.state
 102             -- And new api
 103             net_now.devices[dev] = dev_now
 104             -- With the new api new_now.sent and net_now.received will be the
 105             -- totals across all specified devices
 106         end
 107
 108         if total_t ~= net.last_t or total_r ~= net.last_r then
 109             net_now.sent     = string.format('%.1f', net_now.sent)
 110             net_now.received = string.format('%.1f', net_now.received)
 111             net.last_t       = total_t
 112             net.last_r       = total_r
 113         end
 114
 115         widget = net.widget
 116         settings()
 117     end
 118
 119     helpers.newtimer(net.iface, timeout, update)
 120
 121     return net
 122 end
 123
 124 return setmetatable({}, { __call = function(_, ...) return worker(...) end })