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--[[
LuCI - Lua Configuration Interface
Copyright 2008 Steven Barth <steven@midlink.org>
Copyright 2008 Jo-Philipp Wich <xm@leipzig.freifunk.net>
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
$Id$
]]--
local io = require "io"
local fs = require "nixio.fs"
local util = require "luci.util"
local nixio = require "nixio"
local debug = require "debug"
local string = require "string"
local package = require "package"
local type, loadfile = type, loadfile
module "luci.ccache"
function cache_ondemand(...)
if debug.getinfo(1, 'S').source ~= "=?" then
cache_enable(...)
end
end
function cache_enable(cachepath, mode)
cachepath = cachepath or "/tmp/luci-modulecache"
mode = mode or "r--r--r--"
local loader = package.loaders[2]
local uid = nixio.getpid("uid")
if not fs.stat(cachepath) then
fs.mkdir(cachepath)
end
local function _encode_filename(name)
local encoded = ""
for i=1, #name do
encoded = encoded .. ("%2X" % string.byte(name, i))
end
return encoded
end
local function _load_sane(file)
local stat = fs.stat(file)
if stat and stat.uid == uid and stat.mode == mode then
return loadfile(file)
end
end
local function _write_sane(file, func)
if nixio.getuid() == uid then
local fp = io.open(file, "w")
if fp then
fp:write(util.get_bytecode(func))
fp:close()
fs.chmod(file, mode)
end
end
end
package.loaders[2] = function(mod)
local encoded = cachepath .. "/" .. _encode_filename(mod)
local modcons = _load_sane(encoded)
if modcons then
return modcons
end
-- No cachefile
modcons = loader(mod)
if type(modcons) == "function" then
_write_sane(encoded, modcons)
end
return modcons
end
end
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