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 tostring     = tostring
  16 local setmetatable = setmetatable
  17
  18 -- Network infos
  19 -- lain.widgets.net
  20
  21 local function worker(args)
  22     local net = helpers.make_widget_textbox()
  23     net.last_t = 0
  24     net.last_r = 0
  25     net.devices = {}
  26
  27     local args       = args or {}
  28     local timeout    = args.timeout or 2
  29     local units      = args.units or 1024 --kb
  30     local notify     = args.notify or "on"
  31     local screen     = args.screen or 1
  32     local settings   = args.settings or function() end
  33
  34     -- Compatibility with old API where iface was a string corresponding to 1 interface
  35     net.iface = (args.iface and (type(args.iface) == "string" and {args.iface}) or (type(args.iface) == "table" and args.iface)) or {}
  36
  37
  38     function net.get_device()
  39         helpers.async(string.format("ip link show", device_cmd), function(ws)
  40             ws = ws:match("(%w+): <BROADCAST,MULTICAST,.-,UP,LOWER_UP>")
  41             net.iface = ws and { ws } or {}
  42         end)
  43     end
  44
  45     if #net.iface == 0 then net.get_device() end
  46
  47     function update()
  48         -- These are the totals over all specified interfaces
  49         net_now = {
  50             -- New api - Current state of requested devices
  51             devices  = {},
  52             -- Bytes since last iteration
  53             sent     = 0,
  54             received = 0
  55         }
  56
  57         -- Total bytes transfered
  58         local total_t = 0
  59         local total_r = 0
  60
  61         for i, dev in ipairs(net.iface) do
  62             local dev_now    = {}
  63             local dev_before = net.devices[dev] or { last_t = 0, last_r = 0 }
  64             local now_t      = tonumber(helpers.first_line(string.format("/sys/class/net/%s/statistics/tx_bytes", dev)) or 0)
  65             local now_r      = tonumber(helpers.first_line(string.format("/sys/class/net/%s/statistics/rx_bytes", dev)) or 0)
  66
  67             dev_now.carrier  = helpers.first_line(string.format("/sys/class/net/%s/carrier", dev)) or "0"
  68             dev_now.state    = helpers.first_line(string.format("/sys/class/net/%s/operstate", dev)) or "down"
  69
  70             dev_now.sent     = (now_t - dev_before.last_t) / timeout / units
  71             dev_now.received = (now_r - dev_before.last_r) / timeout / units
  72
  73             net_now.sent     = net_now.sent     + dev_now.sent
  74             net_now.received = net_now.received + dev_now.received
  75
  76             dev_now.sent     = string.format('%.1f', dev_now.sent)
  77             dev_now.received = string.format('%.1f', dev_now.received)
  78
  79             dev_now.last_t   = now_t
  80             dev_now.last_r   = now_r
  81
  82             -- This will become dev_before in the next update/iteration
  83             net.devices[dev] = dev_now
  84
  85             total_t  = total_t + now_t
  86             total_r  = total_r + now_r
  87
  88             -- Notify only once when connection is loss
  89             if string.match(dev_now.carrier, "0") and notify == "on" and helpers.get_map(dev) then
  90                 naughty.notify({
  91                     title    = dev,
  92                     text     = "no carrier",
  93                     icon     = helpers.icons_dir .. "no_net.png",
  94                     screen   = screen
  95                 })
  96                 helpers.set_map(dev, false)
  97             elseif string.match(dev_now.carrier, "1") then
  98                 helpers.set_map(dev, true)
  99             end
 100
 101             -- Old api compatibility
 102             net_now.carrier      = dev_now.carrier
 103             net_now.state        = dev_now.state
 104             -- And new api
 105             net_now.devices[dev] = dev_now
 106             -- With the new api new_now.sent and net_now.received will be the
 107             -- totals across all specified devices
 108         end
 109
 110         if total_t ~= net.last_t or total_r ~= net.last_r then
 111             net_now.sent     = string.format('%.1f', net_now.sent)
 112             net_now.received = string.format('%.1f', net_now.received)
 113             net.last_t       = total_t
 114             net.last_r       = total_r
 115         end
 116
 117         widget = net.widget
 118         settings()
 119     end
 120
 121     helpers.newtimer("net-" .. tostring(net.iface), timeout, update)
 122
 123     return net
 124 end
 125
 126 return setmetatable({}, { __call = function(_, ...) return worker(...) end })