* luci/httpd: add initial server implementation

libs/httpd/luasrc/httpd.lua

@@ -0,0 +1,69 @@
+--[[
+
+HTTP server implementation for LuCI - core
+(c) 2008 Freifunk Leipzig / 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
+
+$Id$
+
+]]--
+
+require("ltn12")
+require("socket")
+
+require("luci.util")
+require("luci.http.protocol")
+require("luci.httpd.server")
+
+
+local srv  = luci.httpd.server
+local host = "0.0.0.0"
+local port = 50000
+
+
+server = socket.bind(host, port)
+server:settimeout( 0, "t" )
+
+reading = { server }
+running = { }
+
+
+while true do
+
+	local input = socket.select( reading, nil, 0.1 )
+
+	-- accept new connections
+	for i, connection in ipairs(input) do
+
+		local sock = connection:accept()
+
+		-- check capacity
+		if #running < srv.MAX_CLIENTS then
+
+			table.insert( running, {
+				coroutine.create( srv.client_handler ),
+				sock
+			} )
+
+		-- reject client
+		else
+			srv.error503( sock )
+		end
+	end
+
+	-- create client handler
+	for i, client in ipairs( running ) do
+
+		-- reap dead clients
+		if coroutine.status( client[1] ) == "dead" then
+			table.remove( running, i )
+		end
+
+		coroutine.resume( client[1], client[2] )
+	end
+end

libs/httpd/luasrc/httpd/server.lua

@@ -0,0 +1,115 @@
+--[[
+
+HTTP server implementation for LuCI - helper class
+(c) 2008 Freifunk Leipzig / 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
+
+$Id$
+
+]]--
+
+module("luci.httpd.server", package.seeall)
+
+
+MAX_CLIENTS  = 15
+READ_BUFSIZE = 1024
+
+
+function error400( client, msg )
+	client:send( "HTTP/1.0 400 Bad request\r\n" )
+	client:send( "Content-Type: text/plain\r\n\r\n" )
+
+	if msg then
+		client:send( msg .. "\r\n" )
+	end
+
+	client:close()
+end
+
+function error503( client )
+	client:send( "HTTP/1.0 503 Server unavailable\r\n" )
+	client:send( "Content-Type: text/plain\r\n\r\n" )
+	client:send( "There are too many clients connected, try again later\r\n" )
+	client:close()
+end
+
+
+function client_handler(client)
+
+	client:settimeout( 0 )
+
+	-- Create LTN12 block source
+	local block_source = function()
+
+		coroutine.yield()
+
+		local chunk, err, part = client:receive( READ_BUFSIZE )
+
+		if chunk == nil and err == "timeout" then
+			return part
+		elseif chunk ~= nil then
+			return chunk
+		else
+			return nil, err
+		end
+
+	end
+
+	-- Create LTN12 line source
+	local line_source = ltn12.source.simplify( function()
+
+		coroutine.yield()
+
+		local chunk, err, part = client:receive("*l")
+
+		-- Line too long
+		if chunk == nil and err ~= "timeout" then
+
+			return nil, part
+				and "Line exceeds maximum allowed length["..part.."]"
+				or  "Unexpected EOF"
+
+		-- Line ok
+		else
+
+			-- Strip trailing CR
+			chunk = chunk:gsub("\r$","")
+
+			-- We got end of headers, switch to dummy source
+			if #chunk == 0 then
+				return "", function()
+					return nil
+				end
+			else
+				return chunk, nil
+			end
+		end
+	end )
+
+	coroutine.yield(client)
+
+
+	-- parse message
+	local message, err = luci.http.protocol.parse_message_header( line_source )
+
+	if message then
+		local s, e = luci.http.protocol.parse_message_body( block_source, message )
+
+		-- XXX: debug
+		luci.util.dumptable( message )
+
+		if not s and e then
+			error400( client, e )
+		end
+	else
+		error400( client, err )
+	end
+
+	-- send response
+	error400( client, "Dummy response" )
+end