-- Copyright 2008 Steven Barth -- Copyright 2008 Jo-Philipp Wich -- Licensed to the public under the Apache License 2.0. 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.getuid() 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.modestr == 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