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|
-----------------------------------
-- Author: Uli Schlachter --
-- Copyright 2009 Uli Schlachter --
-----------------------------------
local io = io
local tonumber = tonumber
local lib = {
widget = require("obvious.lib.widget")
}
-- Returns the total traffic send/received on some interface
local function netinfo(interface)
local net = io.open("/proc/net/dev")
local ret = { }
-- Init in case we don't find any matches
ret.recv = 0
ret.send = 0
for line in net:lines() do
if line:match("^%s+" .. interface) then
ret.recv = tonumber(line:match(":%s*(%d+)"))
ret.send = tonumber(line:match("(%d+)%s+%d+%s+%d+%s+%d+%s+%d+%s+%d+%s+%d+$"))
end
end
net:close()
return ret
end
local function get_data(object)
local last = object.last
local cur = netinfo(object.device)
object.last = cur
local ret = { }
if last then
ret.recv = cur.recv - last.recv
ret.send = cur.send - last.send
else
ret.recv = 0
ret.send = 0
end
-- This can happen e.g. when an interface is brought down and up again
-- or when some counter overflows
if ret.recv < 0 then
ret.recv = 0
end
if ret.send < 0 then
ret.send = 0
end
return ret
end
local function data(device, key)
local device = device or "eth0"
local ret = {}
ret.device = device
ret.get = function(obj)
return get_data(obj)[key]
end
return lib.widget.from_data_source(ret)
end
local function recv(device)
return data(device, "recv")
end
local function send(device)
return data(device, "send")
end
return {
recv = recv,
send = send,
}
-- vim:ft=lua:ts=2:sw=2:sts=2:tw=80:et
|
