--[[
LuCI - SGI-Module for CGI

Description:
Server Gateway Interface for CGI

FileId:
$Id: cgi.lua 6535 2010-11-23 01:02:21Z soma $

License:
Copyright 2008 Steven Barth <steven@midlink.org>

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 

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

]]--
exectime = os.clock()
module("luci.sgi.cgi", package.seeall)
local ltn12 = require("luci.ltn12")
require("nixio.util")
require("luci.http")
require("luci.sys")
require("luci.dispatcher")

-- Limited source to avoid endless blocking
local function limitsource(handle, limit)
	limit = limit or 0
	local BLOCKSIZE = ltn12.BLOCKSIZE

	return function()
		if limit < 1 then
			handle:close()
			return nil
		else
			local read = (limit > BLOCKSIZE) and BLOCKSIZE or limit
			limit = limit - read

			local chunk = handle:read(read)
			if not chunk then handle:close() end
			return chunk
		end
	end
end

function run()
	local r = luci.http.Request(
		luci.sys.getenv(),
		limitsource(io.stdin, tonumber(luci.sys.getenv("CONTENT_LENGTH"))),
		ltn12.sink.file(io.stderr)
	)
	
	local x = coroutine.create(luci.dispatcher.httpdispatch)
	local hcache = ""
	local active = true
	
	while coroutine.status(x) ~= "dead" do
		local res, id, data1, data2 = coroutine.resume(x, r)

		if not res then
			print("Status: 500 Internal Server Error")
			print("Content-Type: text/plain\n")
			print(id)
			break;
		end

		if active then
			if id == 1 then
				io.write("Status: " .. tostring(data1) .. " " .. data2 .. "\r\n")
			elseif id == 2 then
				hcache = hcache .. data1 .. ": " .. data2 .. "\r\n"
			elseif id == 3 then
				io.write(hcache)
				io.write("\r\n")
			elseif id == 4 then
				io.write(tostring(data1 or ""))
			elseif id == 5 then
				io.flush()
				io.close()
				active = false
			elseif id == 6 then
				data1:copyz(nixio.stdout, data2)
				data1:close()
			end
		end
	end
end
