some cpu usage improvements

[etc/awesome.git] / widgets / net.lua

diff --git a/widgets/net.lua b/widgets/net.lua
index 957500069de4cdb572dcd74b6372e400d890fd0a..a4b1097b1b52616cbb02793de1c4c81dca1ed8be 100644 (file)
--- a/widgets/net.lua
+++ b/widgets/net.lua
@@ -8,44 +8,35 @@
 --]]
 
 local helpers      = require("lain.helpers")
-
-local notify_fg    = require("beautiful").fg_focus
 local naughty      = require("naughty")
 local wibox        = require("wibox")
 
-local io           = { popen  = io.popen }
-local tostring     = tostring
 local string       = { format = string.format,
-                       gsub   = string.gsub }
+                       gsub   = string.gsub,
+                       match  = string.match }
 
 local setmetatable = setmetatable
 
 -- Network infos
 -- lain.widgets.net
-local net = {
-    last_t = 0,
-    last_r = 0
-}
-
-function net.get_device()
-    f = io.popen("ip link show | cut -d' ' -f2,9")
-    ws = f:read("*a")
-    f:close()
-    ws = ws:match("%w+: UP")
-    if ws ~= nil then
-        return ws:gsub(": UP", "")
-    else
-        return "network off"
-    end
-end
 
 local function worker(args)
-    local args = args or {}
-    local timeout = args.timeout or 2
-    local iface = args.iface or net.get_device()
-    local units = args.units or 1024 --kb
-    local notify = args.notify or "on"
+    local net = { last_t = 0, last_r = 0 }
+
+    function net.get_device()
+        local ws = helpers.read_pipe("ip link show | cut -d' ' -f2,9")
+        ws = ws:match("%w+: UP") or ws:match("ppp%w+: UNKNOWN")
+        if ws  then return ws:match("(%w+):")
+        else return "network off" end
+    end
+
+    local args     = args or {}
+    local timeout  = args.timeout or 2
+    local units    = args.units or 1024 --kb
+    local notify   = args.notify or "on"
+    local screen   = args.screen or 1
     local settings = args.settings or function() end
+    local iface    = args.iface or net.get_device()
 
     net.widget = wibox.widget.textbox('')
 
@@ -54,41 +45,39 @@ local function worker(args)
     function update()
         net_now = {}
 
-        if iface == "" then iface = net.get_device() end
+        if iface == "" or string.match(iface, "network off")
+        then
+            iface = net.get_device()
+        end
 
-        net_now.carrier = helpers.first_line('/sys/class/net/' .. iface ..
-                                           '/carrier') or "0"
-        net_now.state = helpers.first_line('/sys/class/net/' .. iface ..
-                                           '/operstate') or "down"
-        local now_t = helpers.first_line('/sys/class/net/' .. iface ..
-                                           '/statistics/tx_bytes') or 0
-        local now_r = helpers.first_line('/sys/class/net/' .. iface ..
-                                           '/statistics/rx_bytes') or 0
+        net_now.carrier  = helpers.first_line(string.format('/sys/class/net/%s/carrier', iface)) or '0'
+        net_now.state    = helpers.first_line(string.format('/sys/class/net/%s/operstate', iface)) or 'down'
 
-        net_now.sent = tostring((now_t - net.last_t) / timeout / units)
-        net_now.sent = string.gsub(string.format('%.1f', net_now.sent), ",", ".")
+        local now_t      = helpers.first_line(string.format('/sys/class/net/%s/statistics/tx_bytes', iface)) or 0
+        local now_r      = helpers.first_line(string.format('/sys/class/net/%s/statistics/rx_bytes', iface)) or 0
 
-        net_now.received = tostring((now_r - net.last_r) / timeout / units)
-        net_now.received = string.gsub(string.format('%.1f', net_now.received), ",", ".")
+        if now_t ~= net.last_t or now_r ~= net.last_r then  
+            net_now.sent     = (now_t - net.last_t) / timeout / units
+            net_now.sent     = string.gsub(string.format('%.1f', net_now.sent), ',', '.')
+            net_now.received = (now_r - net.last_r) / timeout / units
+            net_now.received = string.gsub(string.format('%.1f', net_now.received), ',', '.')
 
-        widget = net.widget
-        settings()
+            widget = net.widget
+            settings()
 
-        net.last_t = now_t
-        net.last_r = now_r
+            net.last_t = now_t
+            net.last_r = now_r
+        end
 
-        if net_now.carrier ~= "1" and notify == "on"
+        if not string.match(net_now.carrier, "1") and notify == "on"
         then
             if helpers.get_map(iface)
             then
                 naughty.notify({
                     title    = iface,
                     text     = "no carrier",
-                    timeout  = 7,
-                    position = "top_left",
                     icon     = helpers.icons_dir .. "no_net.png",
-                    fg       = notify_fg or "#FFFFFF",
-                    screen = client.focus and client.focus.screen or 1
+                    screen   = screen
                 })
                 helpers.set_map(iface, false)
             end
@@ -98,7 +87,8 @@ local function worker(args)
     end
 
     helpers.newtimer(iface, timeout, update)
-    return net.widget
+
+    return setmetatable(net, { __index = net.widget })
 end
 
-return setmetatable(net, { __call = function(_, ...) return worker(...) end })
+return setmetatable({}, { __call = function(_, ...) return worker(...) end })