luci/applications/luci-app-vnstat/luasrc/view/vnstat.htm

<%#
 Copyright 2010 Jo-Philipp Wich <jow@openwrt.org>
 Licensed to the public under the Apache License 2.0.
-%>

<%-

local fs  = require "nixio.fs"
local sys = require "luci.sys"
local utl = require "luci.util"

local param = luci.http.formvalue

local iface = param("iface")
local style = param("style")

style = (style and #style > 0) and style or "s"


--
-- render image
--
if iface then
	style = style:gsub("[^%w]", "")
	iface = iface:gsub("[^%w%.%-%_]", "")

	luci.http.prepare_content("image/png")

	local png = io.popen("vnstati -i '%s' '-%s' -o -" % { iface, style })
	luci.http.write(png:read("*a"))
	png:close()

	return

--
-- update database
--
else
	sys.call("vnstat -u >/dev/null 2>/dev/null")
end


--
-- find databases
--
local dbdir, line

for line in io.lines("/etc/vnstat.conf") do
	dbdir = line:match("^%s*DatabaseDir%s+[\"'](%S-)[\"']")
	if dbdir then break end
end

dbdir = dbdir or "/var/lib/vnstat"

-%>

<%+header%>

<h2><a id="content" name="content"><%:VnStat Graphs%></a></h2>

<form action="" method="get">

<select name="style">
	<option value="s"<%=(style == "s") and ' selected="selected"' or ''%>><%:Summary display%></option>
	<option value="t"<%=(style == "t") and ' selected="selected"' or ''%>><%:Top 10 display%></option>
	<option value="h"<%=(style == "h") and ' selected="selected"' or ''%>><%:Hourly traffic%></option>
	<option value="d"<%=(style == "d") and ' selected="selected"' or ''%>><%:Daily traffic%></option>
	<option value="m"<%=(style == "m") and ' selected="selected"' or ''%>><%:Monthly traffic%></option>
</select>

<input type="submit" value="<%:Update »%>" />

</form>

<br /><hr /><br />

<div style="text-align:center">
<%
   empty = true
   ifdir = fs.dir(dbdir)

   if ifdir then
     for iface in ifdir do
       if iface:sub(1,1) ~= "." then
         empty = false
%>
	<img src="<%=REQUEST_URI%>?iface=<%=iface%>&amp;style=<%=param('style')%>" alt="" />
	<br /><br />
<%
       end
     end
   end 
%>

<% if empty then %>
<p><em><%:No database has been set up yet. Go to the VnStat configuration and enable monitoring for one or more interfaces.%></em></p>
<% end %>

</div>

<%+footer%>