net.server_select, net.server_event: Convert to unix line endings from Windows

1 files changed, 786 insertions, 786 deletions

diff --git a/net/server_event.lua b/net/server_event.lua
index 99e972d7..21d6156c 100644
--- a/net/server_event.lua
+++ b/net/server_event.lua
@@ -1,786 +1,786 @@
---[[

-

-

-			server.lua based on lua/libevent by blastbeat

-

-			notes:

-			-- when using luaevent, never register 2 or more EV_READ at one socket, same for EV_WRITE

-			-- you cant even register a new EV_READ/EV_WRITE callback inside another one

-			-- never call eventcallback:close( ) from inside eventcallback

-			-- to do some of the above, use timeout events or something what will called from outside

-			-- dont let garbagecollect eventcallbacks, as long they are running

-			-- when using luasec, there are 4 cases of timeout errors: wantread or wantwrite during reading or writing

-

---]]

-

-

-local SCRIPT_NAME           = "server_event.lua"

-local SCRIPT_VERSION        = "0.05"

-local SCRIPT_AUTHOR         = "blastbeat"

-local LAST_MODIFIED         = "2009/11/20"

-

-local cfg = {

-	MAX_CONNECTIONS       = 100000,  -- max per server connections (use "ulimit -n" on *nix)

-	MAX_HANDSHAKE_ATTEMPS = 10,  -- attemps to finish ssl handshake

-	HANDSHAKE_TIMEOUT     = 1,  -- timout in seconds per handshake attemp

-	MAX_READ_LENGTH       = 1024 * 1024 * 1024 * 1024,  -- max bytes allowed to read from sockets

-	MAX_SEND_LENGTH       = 1024 * 1024 * 1024 * 1024,  -- max bytes size of write buffer (for writing on sockets)

-	ACCEPT_DELAY          = 10,  -- seconds to wait until the next attemp of a full server to accept

-	READ_TIMEOUT          = 60 * 30,  -- timeout in seconds for read data from socket

-	WRITE_TIMEOUT         = 30,  -- timeout in seconds for write data on socket

-	CONNECT_TIMEOUT       = 10,  -- timeout in seconds for connection attemps

-	CLEAR_DELAY           = 5,  -- seconds to wait for clearing interface list (and calling ondisconnect listeners) 

-	DEBUG                 = true,  -- show debug messages

-}

-

-local function use(x) return rawget(_G, x); end

-local print = use "print"

-local pcall = use "pcall"

-local ipairs = use "ipairs"

-local string = use "string"

-local select = use "select"

-local require = use "require"

-local tostring = use "tostring"

-local coroutine = use "coroutine"

-local setmetatable = use "setmetatable"

-

-local ssl = use "ssl"

-local socket = use "socket"

-

-local log = require ("util.logger").init("socket")

-

-local function debug(...)

-	return log("debug", ("%s "):rep(select('#', ...)), ...)

-end

-local vdebug = debug;

-

-local bitor = ( function( ) -- thx Rici Lake

-	local hasbit = function( x, p )

-		return x % ( p + p ) >= p

-	end

-	return function( x, y ) 

-		local p = 1

-		local z = 0

-		local limit = x > y and x or y

-		while p <= limit do 

-			if hasbit( x, p ) or hasbit( y, p ) then

-				z = z + p

-			end

-			p = p + p

-		end

-		return z

-	end

-end )( )

-

-local event = require "luaevent.core"

-local base = event.new( )

-local EV_READ = event.EV_READ

-local EV_WRITE = event.EV_WRITE

-local EV_TIMEOUT = event.EV_TIMEOUT

-

-local EV_READWRITE = bitor( EV_READ, EV_WRITE )

-

-local interfacelist = ( function( )  -- holds the interfaces for sockets

-	local array = { }

-	local len = 0

-	return function( method, arg )

-		if "add" == method then

-			len = len + 1

-			array[ len ] = arg

-			arg:_position( len )

-			return len

-		elseif "delete" == method then

-			if len <= 0 then

-				return nil, "array is already empty"

-			end

-			local position = arg:_position()  -- get position in array

-			if position ~= len then

-				local interface = array[ len ]  -- get last interface

-				array[ position ] = interface  -- copy it into free position

-				array[ len ] = nil  -- free last position

-				interface:_position( position )  -- set new position in array

-			else  -- free last position

-				array[ len ] = nil

-			end

-			len = len - 1

-			return len    

-		else

-			return array

-		end

-	end

-end )( )

-

--- Client interface methods

-local interface_mt

-do

-	interface_mt = {}; interface_mt.__index = interface_mt;

-	

-	local addevent = base.addevent

-	local coroutine_wrap, coroutine_yield = coroutine.wrap,coroutine.yield

-	local string_len = string.len

-	

-	-- Private methods

-	function interface_mt:_position(new_position)

-			self.position = new_position or self.position

-			return self.position;

-	end

-	function interface_mt:_close() -- regs event to start self:_destroy()

-			local callback = function( )

-				self:_destroy();

-				self.eventclose = nil

-				return -1

-			end

-			self.eventclose = addevent( base, nil, EV_TIMEOUT, callback, 0 )

-			return true

-	end

-	

-	function interface_mt:_start_connection(plainssl) -- should be called from addclient

-			local callback = function( event )

-				if EV_TIMEOUT == event then  -- timout during connection

-					self.fatalerror = "connection timeout"

-					self:ontimeout()  -- call timeout listener

-					self:_close()

-					debug( "new connection failed. id:", self.id, "error:", self.fatalerror )

-				else

-					if plainssl then  -- start ssl session

-						self:_start_ssl( self.listener.onconnect )

-					else  -- normal connection

-						self:_start_session( self.listener.onconnect )

-					end

-					debug( "new connection established. id:", self.id )

-				end

-				self.eventconnect = nil

-				return -1

-			end

-			self.eventconnect = addevent( base, self.conn, EV_WRITE, callback, cfg.CONNECT_TIMEOUT )

-			return true

-	end

-	function interface_mt:_start_session(onconnect) -- new session, for example after startssl

-		if self.type == "client" then

-			local callback = function( )

-				self:_lock( false,  false, false )

-				--vdebug( "start listening on client socket with id:", self.id )      

-				self.eventread = addevent( base, self.conn, EV_READ, self.readcallback, cfg.READ_TIMEOUT )  -- register callback

-				self:onconnect()

-				self.eventsession = nil

-				return -1

-			end

-			self.eventsession = addevent( base, nil, EV_TIMEOUT, callback, 0 )

-		else

-			self:_lock( false )

-			--vdebug( "start listening on server socket with id:", self.id )

-			self.eventread = addevent( base, self.conn, EV_READ, self.readcallback )  -- register callback

-		end

-		return true

-	end

-	function interface_mt:_start_ssl(arg) -- old socket will be destroyed, therefore we have to close read/write events first

-			--vdebug( "starting ssl session with client id:", self.id )

-			local _

-			_ = self.eventread and self.eventread:close( )  -- close events; this must be called outside of the event callbacks!

-			_ = self.eventwrite and self.eventwrite:close( )

-			self.eventread, self.eventwrite = nil, nil

-			local err

-			self.conn, err = ssl.wrap( self.conn, self._sslctx )

-			if err then

-				self.fatalerror = err

-				self.conn = nil  -- cannot be used anymore

-				if "onconnect" == arg then

-					self.ondisconnect = nil  -- dont call this when client isnt really connected

-				end

-				self:_close()

-				debug( "fatal error while ssl wrapping:", err )

-				return false

-			end

-			self.conn:settimeout( 0 )  -- set non blocking

-			local handshakecallback = coroutine_wrap(

-				function( event )

-					local _, err

-					local attempt = 0

-					local maxattempt = cfg.MAX_HANDSHAKE_ATTEMPS

-					while attempt < 1000 do  -- no endless loop

-						attempt = attempt + 1

-						debug( "ssl handshake of client with id:"..tostring(self).."attemp:"..attempt )

-						if attempt > maxattempt then

-							self.fatalerror = "max handshake attemps exceeded"

-						elseif EV_TIMEOUT == event then

-							self.fatalerror = "timeout during handshake"

-						else

-							_, err = self.conn:dohandshake( )

-							if not err then

-								self:_lock( false, false, false )  -- unlock the interface; sending, closing etc allowed

-								self.send = self.conn.send  -- caching table lookups with new client object

-								self.receive = self.conn.receive

-								local onsomething

-								if "onconnect" == arg then  -- trigger listener

-									onsomething = self.onconnect

-								else

-									onsomething = self.onsslconnection

-								end

-								self:_start_session( onsomething )

-								debug( "ssl handshake done" )

-								self.eventhandshake = nil

-								return -1

-							end

-							debug( "error during ssl handshake:", err ) 

-							if err == "wantwrite" then

-								event = EV_WRITE

-							elseif err == "wantread" then

-								event = EV_READ

-							else

-								self.fatalerror = err

-							end            

-						end

-						if self.fatalerror then

-							if "onconnect" == arg then

-								self.ondisconnect = nil  -- dont call this when client isnt really connected

-							end

-							self:_close()

-							debug( "handshake failed because:", self.fatalerror )

-							self.eventhandshake = nil

-							return -1

-						end

-						event = coroutine_yield( event, cfg.HANDSHAKE_TIMEOUT )  -- yield this monster...

-					end

-				end

-			)

-			debug "starting handshake..."

-			self:_lock( false, true, true )  -- unlock read/write events, but keep interface locked 

-			self.eventhandshake = addevent( base, self.conn, EV_READWRITE, handshakecallback, cfg.HANDSHAKE_TIMEOUT )

-			return true

-	end

-	function interface_mt:_destroy()  -- close this interface + events and call last listener

-			debug( "closing client with id:", self.id )

-			self:_lock( true, true, true )  -- first of all, lock the interface to avoid further actions

-			local _

-			_ = self.eventread and self.eventread:close( )  -- close events; this must be called outside of the event callbacks!

-			if self.type == "client" then

-				_ = self.eventwrite and self.eventwrite:close( )

-				_ = self.eventhandshake and self.eventhandshake:close( )

-				_ = self.eventstarthandshake and self.eventstarthandshake:close( )

-				_ = self.eventconnect and self.eventconnect:close( )

-				_ = self.eventsession and self.eventsession:close( )

-				_ = self.eventwritetimeout and self.eventwritetimeout:close( )

-				_ = self.eventreadtimeout and self.eventreadtimeout:close( )

-				_ = self.ondisconnect and self:ondisconnect( self.fatalerror )  -- call ondisconnect listener (wont be the case if handshake failed on connect)

-				_ = self.conn and self.conn:close( ) -- close connection, must also be called outside of any socket registered events!

-				_ = self._server and self._server:counter(-1);

-				self.eventread, self.eventwrite = nil, nil

-				self.eventstarthandshake, self.eventhandshake, self.eventclose = nil, nil, nil

-				self.readcallback, self.writecallback = nil, nil

-			else

-				self.conn:close( )

-				self.eventread, self.eventclose = nil, nil

-				self.interface, self.readcallback = nil, nil

-			end

-			interfacelist( "delete", self )

-			return true

-	end

-	

-	function interface_mt:_lock(nointerface, noreading, nowriting)  -- lock or unlock this interface or events

-			self.nointerface, self.noreading, self.nowriting = nointerface, noreading, nowriting

-			return nointerface, noreading, nowriting

-	end

-

-	function interface_mt:counter(c)

-		if c then

-			self._connections = self._connections + c

-		end

-		return self._connections

-	end

-	

-	-- Public methods

-	function interface_mt:write(data)

-		if self.nowriting then return nil, "locked" end

-		--vdebug( "try to send data to client, id/data:", self.id, data )

-		data = tostring( data )

-		local len = string_len( data )

-		local total = len + self.writebufferlen

-		if total > cfg.MAX_SEND_LENGTH then  -- check buffer length

-			local err = "send buffer exceeded"

-			debug( "error:", err )  -- to much, check your app

-			return nil, err

-		end 

-		self.writebuffer = self.writebuffer .. data -- new buffer

-		self.writebufferlen = total

-		if not self.eventwrite then  -- register new write event

-			--vdebug( "register new write event" )

-			self.eventwrite = addevent( base, self.conn, EV_WRITE, self.writecallback, cfg.WRITE_TIMEOUT )

-		end

-		return true

-	end

-	function interface_mt:close(now)

-		if self.nointerface then return nil, "locked"; end

-		debug( "try to close client connection with id:", self.id )

-		if self.type == "client" then

-			self.fatalerror = "client to close"

-			if ( not self.eventwrite ) or now then  -- try to close immediately

-				self:_lock( true, true, true )

-				self:_close()

-				return true

-			else  -- wait for incomplete write request

-				self:_lock( true, true, false )

-				debug "closing delayed until writebuffer is empty"

-				return nil, "writebuffer not empty, waiting"

-			end

-		else

-			debug( "try to close server with id:", self.id, "args:", now )

-			self.fatalerror = "server to close"

-			self:_lock( true )

-			local count = 0

-			for _, item in ipairs( interfacelist( ) ) do

-				if ( item.type ~= "server" ) and ( item._server == self ) then  -- client/server match

-					if item:close( now ) then  -- writebuffer was empty

-						count = count + 1

-					end

-				end

-			end

-			local timeout = 0  -- dont wait for unfinished writebuffers of clients...

-			if not now then

-				timeout = cfg.WRITE_TIMEOUT  -- ...or wait for it

-			end

-			self:_close( timeout )  -- add new event to remove the server interface

-			debug( "seconds remained until server is closed:", timeout )

-			return count  -- returns finished clients with empty writebuffer

-		end

-	end

-	

-	function interface_mt:server()

-		return self._server or self;

-	end

-	

-	function interface_mt:port()

-		return self._port

-	end

-	

-	function interface_mt:ip()

-		return self._ip

-	end

-	

-	function interface_mt:ssl()

-		return self._usingssl

-	end

-

-	function interface_mt:type()

-		return self._type or "client"

-	end

-	

-	function interface_mt:connections()

-		return self._connections

-	end

-	

-	function interface_mt:address()

-		return self.addr

-	end

-	

-	function interface_mt:set_sslctx(sslctx)

-		self._sslctx = sslctx;

-		if sslctx then

-			self.starttls = nil; -- use starttls() of interface_mt

-		else

-			self.starttls = false; -- prevent starttls()

-		end

-	end

-	

-	function interface_mt:set_send(new_send)

-		-- No-op, we always use the underlying connection's send

-	end

-	

-	function interface_mt:starttls()

-		debug( "try to start ssl at client id:", self.id )

-		local err

-		if not self._sslctx then  -- no ssl available

-			err = "no ssl context available"

-		elseif self._usingssl then  -- startssl was already called

-			err = "ssl already active"

-		end

-		if err then

-			debug( "error:", err )

-			return nil, err      

-		end

-		self._usingssl = true

-		self.startsslcallback = function( )  -- we have to start the handshake outside of a read/write event

-			self.startsslcallback = nil

-			self:_start_ssl();

-			self.eventstarthandshake = nil

-			return -1

-		end

-		if not self.eventwrite then

-			self:_lock( true, true, true )  -- lock the interface, to not disturb the handshake

-			self.eventstarthandshake = addevent( base, nil, EV_TIMEOUT, self.startsslcallback, 0 )  -- add event to start handshake

-		else  -- wait until writebuffer is empty

-			self:_lock( true, true, false )

-			debug "ssl session delayed until writebuffer is empty..."

-		end

-		return true

-	end

-	

-	-- Stub handlers

-	function interface_mt:onconnect()

-	end

-	function interface_mt:onincoming()

-	end

-	function interface_mt:ondisconnect()

-	end

-	function interface_mt:ontimeout()

-	end

-end			

-

--- End of client interface methods

-

-local handleclient;

-do

-	local string_sub = string.sub  -- caching table lookups

-	local string_len = string.len

-	local addevent = base.addevent

-	local coroutine_wrap = coroutine.wrap

-	local socket_gettime = socket.gettime

-	local coroutine_yield = coroutine.yield

-	function handleclient( client, ip, port, server, pattern, listener, _, sslctx )  -- creates an client interface

-		--vdebug("creating client interfacce...")

-		local interface = {

-			type = "client";

-			conn = client;

-			currenttime = socket_gettime( );  -- safe the origin

-			writebuffer = "";  -- writebuffer

-			writebufferlen = 0;  -- length of writebuffer

-			send = client.send;  -- caching table lookups

-			receive = client.receive;

-			onconnect = listener.onconnect;  -- will be called when client disconnects

-			ondisconnect = listener.ondisconnect;  -- will be called when client disconnects

-			onincoming = listener.onincoming;  -- will be called when client sends data

-			ontimeout = listener.ontimeout; -- called when fatal socket timeout occurs

-			eventread = false, eventwrite = false, eventclose = false,

-			eventhandshake = false, eventstarthandshake = false;  -- event handler

-			eventconnect = false, eventsession = false;  -- more event handler...

-			eventwritetimeout = false;  -- even more event handler...

-			eventreadtimeout = false;

-			fatalerror = false;  -- error message

-			writecallback = false;  -- will be called on write events

-			readcallback = false;  -- will be called on read events

-			nointerface = true;  -- lock/unlock parameter of this interface

-			noreading = false, nowriting = false;  -- locks of the read/writecallback

-			startsslcallback = false;  -- starting handshake callback

-			position = false;  -- position of client in interfacelist

-			

-			-- Properties

-			_ip = ip, _port = port, _server = server, _pattern = pattern,

-			_sslctx = sslctx; -- parameters

-			_usingssl = false;  -- client is using ssl;

-		}

-		if not sslctx then

-			interface.starttls = false -- don't allow TLS

-		end

-		interface.id = tostring(interface):match("%x+$");

-		interface.writecallback = function( event )  -- called on write events

-			--vdebug( "new client write event, id/ip/port:", interface, ip, port )

-			if interface.nowriting or ( interface.fatalerror and ( "client to close" ~= interface.fatalerror ) ) then  -- leave this event

-				--vdebug( "leaving this event because:", interface.nowriting or interface.fatalerror )

-				interface.eventwrite = false

-				return -1

-			end

-			if EV_TIMEOUT == event then  -- took too long to write some data to socket -> disconnect

-				interface.fatalerror = "timeout during writing"

-				debug( "writing failed:", interface.fatalerror ) 

-				interface:_close()

-				interface.eventwrite = false

-				return -1

-			else  -- can write :)

-				if interface._usingssl then  -- handle luasec

-					if interface.eventreadtimeout then  -- we have to read first

-						local ret = interface.readcallback( )  -- call readcallback

-						--vdebug( "tried to read in writecallback, result:", ret )

-					end

-					if interface.eventwritetimeout then  -- luasec only

-						interface.eventwritetimeout:close( )  -- first we have to close timeout event which where regged after a wantread error

-						interface.eventwritetimeout = false

-					end

-				end

-				local succ, err, byte = interface.conn:send( interface.writebuffer, 1, interface.writebufferlen )

-				--vdebug( "write data:", interface.writebuffer, "error:", err, "part:", byte )

-				if succ then  -- writing succesful

-					interface.writebuffer = ""

-					interface.writebufferlen = 0

-					if interface.fatalerror then

-						debug "closing client after writing"

-						interface:_close()  -- close interface if needed

-					elseif interface.startsslcallback then  -- start ssl connection if needed

-						debug "starting ssl handshake after writing"

-						interface.eventstarthandshake = addevent( base, nil, EV_TIMEOUT, interface.startsslcallback, 0 )

-					elseif interface.eventreadtimeout then

-						return EV_WRITE, EV_TIMEOUT

-					end

-					interface.eventwrite = nil

-					return -1

-				elseif byte then  -- want write again

-					--vdebug( "writebuffer is not empty:", err )

-					interface.writebuffer = string_sub( interface.writebuffer, byte + 1, interface.writebufferlen )  -- new buffer

-					interface.writebufferlen = interface.writebufferlen - byte            

-					if "wantread" == err then  -- happens only with luasec

-						local callback = function( )

-							interface:_close()

-							interface.eventwritetimeout = nil

-							return evreturn, evtimeout

-						end

-						interface.eventwritetimeout = addevent( base, nil, EV_TIMEOUT, callback, cfg.WRITE_TIMEOUT )  -- reg a new timeout event

-						debug( "wantread during write attemp, reg it in readcallback but dont know what really happens next..." )

-						-- hopefully this works with luasec; its simply not possible to use 2 different write events on a socket in luaevent

-						return -1

-					end

-					return EV_WRITE, cfg.WRITE_TIMEOUT 

-				else  -- connection was closed during writing or fatal error

-					interface.fatalerror = err or "fatal error"

-					debug( "connection failed in write event:", interface.fatalerror ) 

-					interface:_close()

-					interface.eventwrite = nil

-					return -1

-				end

-			end

-		end

-		

-		interface.readcallback = function( event )  -- called on read events

-			--vdebug( "new client read event, id/ip/port:", tostring(interface.id), tostring(ip), tostring(port) )

-			if interface.noreading or interface.fatalerror then  -- leave this event

-				--vdebug( "leaving this event because:", tostring(interface.noreading or interface.fatalerror) )

-				interface.eventread = nil

-				return -1

-			end

-			if EV_TIMEOUT == event then  -- took too long to get some data from client -> disconnect

-				interface.fatalerror = "timeout during receiving"

-				debug( "connection failed:", interface.fatalerror ) 

-				interface:_close()

-				interface.eventread = nil

-				return -1

-			else -- can read

-				if interface._usingssl then  -- handle luasec

-					if interface.eventwritetimeout then  -- ok, in the past writecallback was regged

-						local ret = interface.writecallback( )  -- call it

-						--vdebug( "tried to write in readcallback, result:", tostring(ret) )

-					end

-					if interface.eventreadtimeout then

-						interface.eventreadtimeout:close( )

-						interface.eventreadtimeout = nil

-					end

-				end

-				local buffer, err, part = interface.conn:receive( pattern )  -- receive buffer with "pattern"

-				--vdebug( "read data:", tostring(buffer), "error:", tostring(err), "part:", tostring(part) )        

-				buffer = buffer or part or ""

-				local len = string_len( buffer )

-				if len > cfg.MAX_READ_LENGTH then  -- check buffer length

-					interface.fatalerror = "receive buffer exceeded"

-					debug( "fatal error:", interface.fatalerror )

-					interface:_close()

-					interface.eventread = nil

-					return -1

-				end

-				interface.onincoming( interface, buffer, err )  -- send new data to listener

-				if err and ( err ~= "timeout" and err ~= "wantread" ) then

-					if "wantwrite" == err then -- need to read on write event

-						if not interface.eventwrite then  -- register new write event if needed

-							interface.eventwrite = addevent( base, interface.conn, EV_WRITE, interface.writecallback, cfg.WRITE_TIMEOUT )

-						end

-						interface.eventreadtimeout = addevent( base, nil, EV_TIMEOUT,

-							function( )

-								interface:_close()

-							end, cfg.READ_TIMEOUT

-						)             

-						debug( "wantwrite during read attemp, reg it in writecallback but dont know what really happens next..." )

-						-- to be honest i dont know what happens next, if it is allowed to first read, the write etc...

-					else  -- connection was closed or fatal error            

-						interface.fatalerror = err

-						debug( "connection failed in read event:", interface.fatalerror ) 

-						interface:_close()

-						interface.eventread = nil

-						return -1

-					end

-				end

-				return EV_READ, cfg.READ_TIMEOUT

-			end

-		end

-

-		client:settimeout( 0 )  -- set non blocking

-		setmetatable(interface, interface_mt)

-		interfacelist( "add", interface )  -- add to interfacelist

-		return interface

-	end

-end

-

-local handleserver

-do

-	function handleserver( server, addr, port, pattern, listener, sslctx, startssl )  -- creates an server interface

-		debug "creating server interface..."

-		local interface = {

-			_connections = 0;

-			

-			conn = server;

-			onconnect = listener.onconnect;  -- will be called when new client connected

-			eventread = false;  -- read event handler

-			eventclose = false; -- close event handler

-			readcallback = false; -- read event callback

-			fatalerror = false; -- error message

-			nointerface = true;  -- lock/unlock parameter

-		}

-		interface.id = tostring(interface):match("%x+$");

-		interface.readcallback = function( event )  -- server handler, called on incoming connections

-			--vdebug( "server can accept, id/addr/port:", interface, addr, port )

-			if interface.fatalerror then

-				--vdebug( "leaving this event because:", self.fatalerror )

-				interface.eventread = nil

-				return -1

-			end

-			local delay = cfg.ACCEPT_DELAY

-			if EV_TIMEOUT == event then

-				if interface._connections >= cfg.MAX_CONNECTIONS then  -- check connection count

-					debug( "to many connections, seconds to wait for next accept:", delay )

-					return EV_TIMEOUT, delay  -- timeout...

-				else

-					return EV_READ  -- accept again

-				end

-			end

-			--vdebug("max connection check ok, accepting...")

-			local client, err = server:accept()    -- try to accept; TODO: check err

-			while client do

-				if interface._connections >= cfg.MAX_CONNECTIONS then

-					client:close( )  -- refuse connection

-					debug( "maximal connections reached, refuse client connection; accept delay:", delay )

-					return EV_TIMEOUT, delay  -- delay for next accept attemp

-				end

-				local ip, port = client:getpeername( )

-				interface._connections = interface._connections + 1  -- increase connection count

-				local clientinterface = handleclient( client, ip, port, interface, pattern, listener, nil, sslctx )

-				--vdebug( "client id:", clientinterface, "startssl:", startssl )

-				if startssl then

-					clientinterface:_start_ssl( clientinterface.onconnect )

-				else

-					clientinterface:_start_session( clientinterface.onconnect )

-				end

-				debug( "accepted incoming client connection from:", ip, port )

-				client, err = server:accept()    -- try to accept again

-			end

-			return EV_READ

-		end

-		

-		server:settimeout( 0 )

-		setmetatable(interface, interface_mt)

-		interfacelist( "add", interface )

-		interface:_start_session()

-		return interface

-	end

-end

-

-local addserver = ( function( )

-	return function( addr, port, listener, pattern, sslcfg, startssl )  -- TODO: check arguments

-		--vdebug( "creating new tcp server with following parameters:", addr or "nil", port or "nil", sslcfg or "nil", startssl or "nil")

-		local server, err = socket.bind( addr, port, cfg.ACCEPT_QUEUE )  -- create server socket

-		if not server then

-			debug( "creating server socket failed because:", err )

-			return nil, err

-		end

-		local sslctx

-		if sslcfg then

-			if not ssl then

-				debug "fatal error: luasec not found"

-				return nil, "luasec not found"

-			end

-			sslctx, err = ssl.newcontext( sslcfg )

-			if err then

-				debug( "error while creating new ssl context for server socket:", err )

-				return nil, err

-			end

-		end      

-		local interface = handleserver( server, addr, port, pattern, listener, sslctx, startssl )  -- new server handler

-		debug( "new server created with id:", tostring(interface))

-		return interface

-	end

-end )( )

-

-local addclient, wrapclient

-do

-	function wrapclient( client, ip, port, listeners, pattern, sslctx, startssl )

-		local interface = handleclient( client, ip, port, nil, pattern, listeners, sslctx )

-		interface:_start_session()

-		return interface

-		--function handleclient( client, ip, port, server, pattern, listener, _, sslctx )  -- creates an client interface

-	end

-	

-	function addclient( addr, serverport, listener, pattern, localaddr, localport, sslcfg, startssl )

-		local client, err = socket.tcp()  -- creating new socket

-		if not client then

-			debug( "cannot create socket:", err ) 

-			return nil, err

-		end

-		client:settimeout( 0 )  -- set nonblocking

-		if localaddr then

-			local res, err = client:bind( localaddr, localport, -1 )

-			if not res then

-				debug( "cannot bind client:", err )

-				return nil, err

-			end

-		end

-		local sslctx

-		if sslcfg then  -- handle ssl/new context

-			if not ssl then

-				debug "need luasec, but not available" 

-				return nil, "luasec not found"

-			end

-			sslctx, err = ssl.newcontext( sslcfg )

-			if err then

-				debug( "cannot create new ssl context:", err )

-				return nil, err

-			end

-		end

-		local res, err = client:connect( addr, serverport )  -- connect

-		if res or ( err == "timeout" ) then

-			local ip, port = client:getsockname( )

-			local server = function( )

-				return nil, "this is a dummy server interface"

-			end

-			local interface = wrapclient( client, ip, serverport, listeners, pattern, sslctx, startssl )

-			interface:_start_connection( startssl )

-			debug( "new connection id:", interface.id )

-			return interface, err

-		else

-			debug( "new connection failed:", err )

-			return nil, err

-		end

-	end

-end

-

-

-local loop = function( )  -- starts the event loop

-	return base:loop( )

-end

-

-local newevent = ( function( )

-	local add = base.addevent

-	return function( ... )

-		return add( base, ... )

-	end

-end )( )

-

-local closeallservers = function( arg )

-	for _, item in ipairs( interfacelist( ) ) do

-		if item "type" == "server" then

-			item( "close", arg )

-		end

-	end

-end

-

-return {

-

-	cfg = cfg,

-	base = base,

-	loop = loop,

-	event = event,

-	event_base = base,

-	addevent = newevent,

-	addserver = addserver,

-	addclient = addclient,

-	wrapclient = wrapclient,

-	closeallservers = closeallservers,

-

-	__NAME = SCRIPT_NAME,

-	__DATE = LAST_MODIFIED,

-	__AUTHOR = SCRIPT_AUTHOR,

-	__VERSION = SCRIPT_VERSION,

-

-}

+--[[
+
+
+			server.lua based on lua/libevent by blastbeat
+
+			notes:
+			-- when using luaevent, never register 2 or more EV_READ at one socket, same for EV_WRITE
+			-- you cant even register a new EV_READ/EV_WRITE callback inside another one
+			-- never call eventcallback:close( ) from inside eventcallback
+			-- to do some of the above, use timeout events or something what will called from outside
+			-- dont let garbagecollect eventcallbacks, as long they are running
+			-- when using luasec, there are 4 cases of timeout errors: wantread or wantwrite during reading or writing
+
+--]]
+
+
+local SCRIPT_NAME           = "server_event.lua"
+local SCRIPT_VERSION        = "0.05"
+local SCRIPT_AUTHOR         = "blastbeat"
+local LAST_MODIFIED         = "2009/11/20"
+
+local cfg = {
+	MAX_CONNECTIONS       = 100000,  -- max per server connections (use "ulimit -n" on *nix)
+	MAX_HANDSHAKE_ATTEMPS = 10,  -- attemps to finish ssl handshake
+	HANDSHAKE_TIMEOUT     = 1,  -- timout in seconds per handshake attemp
+	MAX_READ_LENGTH       = 1024 * 1024 * 1024 * 1024,  -- max bytes allowed to read from sockets
+	MAX_SEND_LENGTH       = 1024 * 1024 * 1024 * 1024,  -- max bytes size of write buffer (for writing on sockets)
+	ACCEPT_DELAY          = 10,  -- seconds to wait until the next attemp of a full server to accept
+	READ_TIMEOUT          = 60 * 30,  -- timeout in seconds for read data from socket
+	WRITE_TIMEOUT         = 30,  -- timeout in seconds for write data on socket
+	CONNECT_TIMEOUT       = 10,  -- timeout in seconds for connection attemps
+	CLEAR_DELAY           = 5,  -- seconds to wait for clearing interface list (and calling ondisconnect listeners) 
+	DEBUG                 = true,  -- show debug messages
+}
+
+local function use(x) return rawget(_G, x); end
+local print = use "print"
+local pcall = use "pcall"
+local ipairs = use "ipairs"
+local string = use "string"
+local select = use "select"
+local require = use "require"
+local tostring = use "tostring"
+local coroutine = use "coroutine"
+local setmetatable = use "setmetatable"
+
+local ssl = use "ssl"
+local socket = use "socket"
+
+local log = require ("util.logger").init("socket")
+
+local function debug(...)
+	return log("debug", ("%s "):rep(select('#', ...)), ...)
+end
+local vdebug = debug;
+
+local bitor = ( function( ) -- thx Rici Lake
+	local hasbit = function( x, p )
+		return x % ( p + p ) >= p
+	end
+	return function( x, y ) 
+		local p = 1
+		local z = 0
+		local limit = x > y and x or y
+		while p <= limit do 
+			if hasbit( x, p ) or hasbit( y, p ) then
+				z = z + p
+			end
+			p = p + p
+		end
+		return z
+	end
+end )( )
+
+local event = require "luaevent.core"
+local base = event.new( )
+local EV_READ = event.EV_READ
+local EV_WRITE = event.EV_WRITE
+local EV_TIMEOUT = event.EV_TIMEOUT
+
+local EV_READWRITE = bitor( EV_READ, EV_WRITE )
+
+local interfacelist = ( function( )  -- holds the interfaces for sockets
+	local array = { }
+	local len = 0
+	return function( method, arg )
+		if "add" == method then
+			len = len + 1
+			array[ len ] = arg
+			arg:_position( len )
+			return len
+		elseif "delete" == method then
+			if len <= 0 then
+				return nil, "array is already empty"
+			end
+			local position = arg:_position()  -- get position in array
+			if position ~= len then
+				local interface = array[ len ]  -- get last interface
+				array[ position ] = interface  -- copy it into free position
+				array[ len ] = nil  -- free last position
+				interface:_position( position )  -- set new position in array
+			else  -- free last position
+				array[ len ] = nil
+			end
+			len = len - 1
+			return len    
+		else
+			return array
+		end
+	end
+end )( )
+
+-- Client interface methods
+local interface_mt
+do
+	interface_mt = {}; interface_mt.__index = interface_mt;
+	
+	local addevent = base.addevent
+	local coroutine_wrap, coroutine_yield = coroutine.wrap,coroutine.yield
+	local string_len = string.len
+	
+	-- Private methods
+	function interface_mt:_position(new_position)
+			self.position = new_position or self.position
+			return self.position;
+	end
+	function interface_mt:_close() -- regs event to start self:_destroy()
+			local callback = function( )
+				self:_destroy();
+				self.eventclose = nil
+				return -1
+			end
+			self.eventclose = addevent( base, nil, EV_TIMEOUT, callback, 0 )
+			return true
+	end
+	
+	function interface_mt:_start_connection(plainssl) -- should be called from addclient
+			local callback = function( event )
+				if EV_TIMEOUT == event then  -- timout during connection
+					self.fatalerror = "connection timeout"
+					self:ontimeout()  -- call timeout listener
+					self:_close()
+					debug( "new connection failed. id:", self.id, "error:", self.fatalerror )
+				else
+					if plainssl then  -- start ssl session
+						self:_start_ssl( self.listener.onconnect )
+					else  -- normal connection
+						self:_start_session( self.listener.onconnect )
+					end
+					debug( "new connection established. id:", self.id )
+				end
+				self.eventconnect = nil
+				return -1
+			end
+			self.eventconnect = addevent( base, self.conn, EV_WRITE, callback, cfg.CONNECT_TIMEOUT )
+			return true
+	end
+	function interface_mt:_start_session(onconnect) -- new session, for example after startssl
+		if self.type == "client" then
+			local callback = function( )
+				self:_lock( false,  false, false )
+				--vdebug( "start listening on client socket with id:", self.id )      
+				self.eventread = addevent( base, self.conn, EV_READ, self.readcallback, cfg.READ_TIMEOUT )  -- register callback
+				self:onconnect()
+				self.eventsession = nil
+				return -1
+			end
+			self.eventsession = addevent( base, nil, EV_TIMEOUT, callback, 0 )
+		else
+			self:_lock( false )
+			--vdebug( "start listening on server socket with id:", self.id )
+			self.eventread = addevent( base, self.conn, EV_READ, self.readcallback )  -- register callback
+		end
+		return true
+	end
+	function interface_mt:_start_ssl(arg) -- old socket will be destroyed, therefore we have to close read/write events first
+			--vdebug( "starting ssl session with client id:", self.id )
+			local _
+			_ = self.eventread and self.eventread:close( )  -- close events; this must be called outside of the event callbacks!
+			_ = self.eventwrite and self.eventwrite:close( )
+			self.eventread, self.eventwrite = nil, nil
+			local err
+			self.conn, err = ssl.wrap( self.conn, self._sslctx )
+			if err then
+				self.fatalerror = err
+				self.conn = nil  -- cannot be used anymore
+				if "onconnect" == arg then
+					self.ondisconnect = nil  -- dont call this when client isnt really connected
+				end
+				self:_close()
+				debug( "fatal error while ssl wrapping:", err )
+				return false
+			end
+			self.conn:settimeout( 0 )  -- set non blocking
+			local handshakecallback = coroutine_wrap(
+				function( event )
+					local _, err
+					local attempt = 0
+					local maxattempt = cfg.MAX_HANDSHAKE_ATTEMPS
+					while attempt < 1000 do  -- no endless loop
+						attempt = attempt + 1
+						debug( "ssl handshake of client with id:"..tostring(self).."attemp:"..attempt )
+						if attempt > maxattempt then
+							self.fatalerror = "max handshake attemps exceeded"
+						elseif EV_TIMEOUT == event then
+							self.fatalerror = "timeout during handshake"
+						else
+							_, err = self.conn:dohandshake( )
+							if not err then
+								self:_lock( false, false, false )  -- unlock the interface; sending, closing etc allowed
+								self.send = self.conn.send  -- caching table lookups with new client object
+								self.receive = self.conn.receive
+								local onsomething
+								if "onconnect" == arg then  -- trigger listener
+									onsomething = self.onconnect
+								else
+									onsomething = self.onsslconnection
+								end
+								self:_start_session( onsomething )
+								debug( "ssl handshake done" )
+								self.eventhandshake = nil
+								return -1
+							end
+							debug( "error during ssl handshake:", err ) 
+							if err == "wantwrite" then
+								event = EV_WRITE
+							elseif err == "wantread" then
+								event = EV_READ
+							else
+								self.fatalerror = err
+							end            
+						end
+						if self.fatalerror then
+							if "onconnect" == arg then
+								self.ondisconnect = nil  -- dont call this when client isnt really connected
+							end
+							self:_close()
+							debug( "handshake failed because:", self.fatalerror )
+							self.eventhandshake = nil
+							return -1
+						end
+						event = coroutine_yield( event, cfg.HANDSHAKE_TIMEOUT )  -- yield this monster...
+					end
+				end
+			)
+			debug "starting handshake..."
+			self:_lock( false, true, true )  -- unlock read/write events, but keep interface locked 
+			self.eventhandshake = addevent( base, self.conn, EV_READWRITE, handshakecallback, cfg.HANDSHAKE_TIMEOUT )
+			return true
+	end
+	function interface_mt:_destroy()  -- close this interface + events and call last listener
+			debug( "closing client with id:", self.id )
+			self:_lock( true, true, true )  -- first of all, lock the interface to avoid further actions
+			local _
+			_ = self.eventread and self.eventread:close( )  -- close events; this must be called outside of the event callbacks!
+			if self.type == "client" then
+				_ = self.eventwrite and self.eventwrite:close( )
+				_ = self.eventhandshake and self.eventhandshake:close( )
+				_ = self.eventstarthandshake and self.eventstarthandshake:close( )
+				_ = self.eventconnect and self.eventconnect:close( )
+				_ = self.eventsession and self.eventsession:close( )
+				_ = self.eventwritetimeout and self.eventwritetimeout:close( )
+				_ = self.eventreadtimeout and self.eventreadtimeout:close( )
+				_ = self.ondisconnect and self:ondisconnect( self.fatalerror )  -- call ondisconnect listener (wont be the case if handshake failed on connect)
+				_ = self.conn and self.conn:close( ) -- close connection, must also be called outside of any socket registered events!
+				_ = self._server and self._server:counter(-1);
+				self.eventread, self.eventwrite = nil, nil
+				self.eventstarthandshake, self.eventhandshake, self.eventclose = nil, nil, nil
+				self.readcallback, self.writecallback = nil, nil
+			else
+				self.conn:close( )
+				self.eventread, self.eventclose = nil, nil
+				self.interface, self.readcallback = nil, nil
+			end
+			interfacelist( "delete", self )
+			return true
+	end
+	
+	function interface_mt:_lock(nointerface, noreading, nowriting)  -- lock or unlock this interface or events
+			self.nointerface, self.noreading, self.nowriting = nointerface, noreading, nowriting
+			return nointerface, noreading, nowriting
+	end
+
+	function interface_mt:counter(c)
+		if c then
+			self._connections = self._connections + c
+		end
+		return self._connections
+	end
+	
+	-- Public methods
+	function interface_mt:write(data)
+		if self.nowriting then return nil, "locked" end
+		--vdebug( "try to send data to client, id/data:", self.id, data )
+		data = tostring( data )
+		local len = string_len( data )
+		local total = len + self.writebufferlen
+		if total > cfg.MAX_SEND_LENGTH then  -- check buffer length
+			local err = "send buffer exceeded"
+			debug( "error:", err )  -- to much, check your app
+			return nil, err
+		end 
+		self.writebuffer = self.writebuffer .. data -- new buffer
+		self.writebufferlen = total
+		if not self.eventwrite then  -- register new write event
+			--vdebug( "register new write event" )
+			self.eventwrite = addevent( base, self.conn, EV_WRITE, self.writecallback, cfg.WRITE_TIMEOUT )
+		end
+		return true
+	end
+	function interface_mt:close(now)
+		if self.nointerface then return nil, "locked"; end
+		debug( "try to close client connection with id:", self.id )
+		if self.type == "client" then
+			self.fatalerror = "client to close"
+			if ( not self.eventwrite ) or now then  -- try to close immediately
+				self:_lock( true, true, true )
+				self:_close()
+				return true
+			else  -- wait for incomplete write request
+				self:_lock( true, true, false )
+				debug "closing delayed until writebuffer is empty"
+				return nil, "writebuffer not empty, waiting"
+			end
+		else
+			debug( "try to close server with id:", self.id, "args:", now )
+			self.fatalerror = "server to close"
+			self:_lock( true )
+			local count = 0
+			for _, item in ipairs( interfacelist( ) ) do
+				if ( item.type ~= "server" ) and ( item._server == self ) then  -- client/server match
+					if item:close( now ) then  -- writebuffer was empty
+						count = count + 1
+					end
+				end
+			end
+			local timeout = 0  -- dont wait for unfinished writebuffers of clients...
+			if not now then
+				timeout = cfg.WRITE_TIMEOUT  -- ...or wait for it
+			end
+			self:_close( timeout )  -- add new event to remove the server interface
+			debug( "seconds remained until server is closed:", timeout )
+			return count  -- returns finished clients with empty writebuffer
+		end
+	end
+	
+	function interface_mt:server()
+		return self._server or self;
+	end
+	
+	function interface_mt:port()
+		return self._port
+	end
+	
+	function interface_mt:ip()
+		return self._ip
+	end
+	
+	function interface_mt:ssl()
+		return self._usingssl
+	end
+
+	function interface_mt:type()
+		return self._type or "client"
+	end
+	
+	function interface_mt:connections()
+		return self._connections
+	end
+	
+	function interface_mt:address()
+		return self.addr
+	end
+	
+	function interface_mt:set_sslctx(sslctx)
+		self._sslctx = sslctx;
+		if sslctx then
+			self.starttls = nil; -- use starttls() of interface_mt
+		else
+			self.starttls = false; -- prevent starttls()
+		end
+	end
+	
+	function interface_mt:set_send(new_send)
+		-- No-op, we always use the underlying connection's send
+	end
+	
+	function interface_mt:starttls()
+		debug( "try to start ssl at client id:", self.id )
+		local err
+		if not self._sslctx then  -- no ssl available
+			err = "no ssl context available"
+		elseif self._usingssl then  -- startssl was already called
+			err = "ssl already active"
+		end
+		if err then
+			debug( "error:", err )
+			return nil, err      
+		end
+		self._usingssl = true
+		self.startsslcallback = function( )  -- we have to start the handshake outside of a read/write event
+			self.startsslcallback = nil
+			self:_start_ssl();
+			self.eventstarthandshake = nil
+			return -1
+		end
+		if not self.eventwrite then
+			self:_lock( true, true, true )  -- lock the interface, to not disturb the handshake
+			self.eventstarthandshake = addevent( base, nil, EV_TIMEOUT, self.startsslcallback, 0 )  -- add event to start handshake
+		else  -- wait until writebuffer is empty
+			self:_lock( true, true, false )
+			debug "ssl session delayed until writebuffer is empty..."
+		end
+		return true
+	end
+	
+	-- Stub handlers
+	function interface_mt:onconnect()
+	end
+	function interface_mt:onincoming()
+	end
+	function interface_mt:ondisconnect()
+	end
+	function interface_mt:ontimeout()
+	end
+end			
+
+-- End of client interface methods
+
+local handleclient;
+do
+	local string_sub = string.sub  -- caching table lookups
+	local string_len = string.len
+	local addevent = base.addevent
+	local coroutine_wrap = coroutine.wrap
+	local socket_gettime = socket.gettime
+	local coroutine_yield = coroutine.yield
+	function handleclient( client, ip, port, server, pattern, listener, _, sslctx )  -- creates an client interface
+		--vdebug("creating client interfacce...")
+		local interface = {
+			type = "client";
+			conn = client;
+			currenttime = socket_gettime( );  -- safe the origin
+			writebuffer = "";  -- writebuffer
+			writebufferlen = 0;  -- length of writebuffer
+			send = client.send;  -- caching table lookups
+			receive = client.receive;
+			onconnect = listener.onconnect;  -- will be called when client disconnects
+			ondisconnect = listener.ondisconnect;  -- will be called when client disconnects
+			onincoming = listener.onincoming;  -- will be called when client sends data
+			ontimeout = listener.ontimeout; -- called when fatal socket timeout occurs
+			eventread = false, eventwrite = false, eventclose = false,
+			eventhandshake = false, eventstarthandshake = false;  -- event handler
+			eventconnect = false, eventsession = false;  -- more event handler...
+			eventwritetimeout = false;  -- even more event handler...
+			eventreadtimeout = false;
+			fatalerror = false;  -- error message
+			writecallback = false;  -- will be called on write events
+			readcallback = false;  -- will be called on read events
+			nointerface = true;  -- lock/unlock parameter of this interface
+			noreading = false, nowriting = false;  -- locks of the read/writecallback
+			startsslcallback = false;  -- starting handshake callback
+			position = false;  -- position of client in interfacelist
+			
+			-- Properties
+			_ip = ip, _port = port, _server = server, _pattern = pattern,
+			_sslctx = sslctx; -- parameters
+			_usingssl = false;  -- client is using ssl;
+		}
+		if not sslctx then
+			interface.starttls = false -- don't allow TLS
+		end
+		interface.id = tostring(interface):match("%x+$");
+		interface.writecallback = function( event )  -- called on write events
+			--vdebug( "new client write event, id/ip/port:", interface, ip, port )
+			if interface.nowriting or ( interface.fatalerror and ( "client to close" ~= interface.fatalerror ) ) then  -- leave this event
+				--vdebug( "leaving this event because:", interface.nowriting or interface.fatalerror )
+				interface.eventwrite = false
+				return -1
+			end
+			if EV_TIMEOUT == event then  -- took too long to write some data to socket -> disconnect
+				interface.fatalerror = "timeout during writing"
+				debug( "writing failed:", interface.fatalerror ) 
+				interface:_close()
+				interface.eventwrite = false
+				return -1
+			else  -- can write :)
+				if interface._usingssl then  -- handle luasec
+					if interface.eventreadtimeout then  -- we have to read first
+						local ret = interface.readcallback( )  -- call readcallback
+						--vdebug( "tried to read in writecallback, result:", ret )
+					end
+					if interface.eventwritetimeout then  -- luasec only
+						interface.eventwritetimeout:close( )  -- first we have to close timeout event which where regged after a wantread error
+						interface.eventwritetimeout = false
+					end
+				end
+				local succ, err, byte = interface.conn:send( interface.writebuffer, 1, interface.writebufferlen )
+				--vdebug( "write data:", interface.writebuffer, "error:", err, "part:", byte )
+				if succ then  -- writing succesful
+					interface.writebuffer = ""
+					interface.writebufferlen = 0
+					if interface.fatalerror then
+						debug "closing client after writing"
+						interface:_close()  -- close interface if needed
+					elseif interface.startsslcallback then  -- start ssl connection if needed
+						debug "starting ssl handshake after writing"
+						interface.eventstarthandshake = addevent( base, nil, EV_TIMEOUT, interface.startsslcallback, 0 )
+					elseif interface.eventreadtimeout then
+						return EV_WRITE, EV_TIMEOUT
+					end
+					interface.eventwrite = nil
+					return -1
+				elseif byte then  -- want write again
+					--vdebug( "writebuffer is not empty:", err )
+					interface.writebuffer = string_sub( interface.writebuffer, byte + 1, interface.writebufferlen )  -- new buffer
+					interface.writebufferlen = interface.writebufferlen - byte            
+					if "wantread" == err then  -- happens only with luasec
+						local callback = function( )
+							interface:_close()
+							interface.eventwritetimeout = nil
+							return evreturn, evtimeout
+						end
+						interface.eventwritetimeout = addevent( base, nil, EV_TIMEOUT, callback, cfg.WRITE_TIMEOUT )  -- reg a new timeout event
+						debug( "wantread during write attemp, reg it in readcallback but dont know what really happens next..." )
+						-- hopefully this works with luasec; its simply not possible to use 2 different write events on a socket in luaevent
+						return -1
+					end
+					return EV_WRITE, cfg.WRITE_TIMEOUT 
+				else  -- connection was closed during writing or fatal error
+					interface.fatalerror = err or "fatal error"
+					debug( "connection failed in write event:", interface.fatalerror ) 
+					interface:_close()
+					interface.eventwrite = nil
+					return -1
+				end
+			end
+		end
+		
+		interface.readcallback = function( event )  -- called on read events
+			--vdebug( "new client read event, id/ip/port:", tostring(interface.id), tostring(ip), tostring(port) )
+			if interface.noreading or interface.fatalerror then  -- leave this event
+				--vdebug( "leaving this event because:", tostring(interface.noreading or interface.fatalerror) )
+				interface.eventread = nil
+				return -1
+			end
+			if EV_TIMEOUT == event then  -- took too long to get some data from client -> disconnect
+				interface.fatalerror = "timeout during receiving"
+				debug( "connection failed:", interface.fatalerror ) 
+				interface:_close()
+				interface.eventread = nil
+				return -1
+			else -- can read
+				if interface._usingssl then  -- handle luasec
+					if interface.eventwritetimeout then  -- ok, in the past writecallback was regged
+						local ret = interface.writecallback( )  -- call it
+						--vdebug( "tried to write in readcallback, result:", tostring(ret) )
+					end
+					if interface.eventreadtimeout then
+						interface.eventreadtimeout:close( )
+						interface.eventreadtimeout = nil
+					end
+				end
+				local buffer, err, part = interface.conn:receive( pattern )  -- receive buffer with "pattern"
+				--vdebug( "read data:", tostring(buffer), "error:", tostring(err), "part:", tostring(part) )        
+				buffer = buffer or part or ""
+				local len = string_len( buffer )
+				if len > cfg.MAX_READ_LENGTH then  -- check buffer length
+					interface.fatalerror = "receive buffer exceeded"
+					debug( "fatal error:", interface.fatalerror )
+					interface:_close()
+					interface.eventread = nil
+					return -1
+				end
+				interface.onincoming( interface, buffer, err )  -- send new data to listener
+				if err and ( err ~= "timeout" and err ~= "wantread" ) then
+					if "wantwrite" == err then -- need to read on write event
+						if not interface.eventwrite then  -- register new write event if needed
+							interface.eventwrite = addevent( base, interface.conn, EV_WRITE, interface.writecallback, cfg.WRITE_TIMEOUT )
+						end
+						interface.eventreadtimeout = addevent( base, nil, EV_TIMEOUT,
+							function( )
+								interface:_close()
+							end, cfg.READ_TIMEOUT
+						)             
+						debug( "wantwrite during read attemp, reg it in writecallback but dont know what really happens next..." )
+						-- to be honest i dont know what happens next, if it is allowed to first read, the write etc...
+					else  -- connection was closed or fatal error            
+						interface.fatalerror = err
+						debug( "connection failed in read event:", interface.fatalerror ) 
+						interface:_close()
+						interface.eventread = nil
+						return -1
+					end
+				end
+				return EV_READ, cfg.READ_TIMEOUT
+			end
+		end
+
+		client:settimeout( 0 )  -- set non blocking
+		setmetatable(interface, interface_mt)
+		interfacelist( "add", interface )  -- add to interfacelist
+		return interface
+	end
+end
+
+local handleserver
+do
+	function handleserver( server, addr, port, pattern, listener, sslctx, startssl )  -- creates an server interface
+		debug "creating server interface..."
+		local interface = {
+			_connections = 0;
+			
+			conn = server;
+			onconnect = listener.onconnect;  -- will be called when new client connected
+			eventread = false;  -- read event handler
+			eventclose = false; -- close event handler
+			readcallback = false; -- read event callback
+			fatalerror = false; -- error message
+			nointerface = true;  -- lock/unlock parameter
+		}
+		interface.id = tostring(interface):match("%x+$");
+		interface.readcallback = function( event )  -- server handler, called on incoming connections
+			--vdebug( "server can accept, id/addr/port:", interface, addr, port )
+			if interface.fatalerror then
+				--vdebug( "leaving this event because:", self.fatalerror )
+				interface.eventread = nil
+				return -1
+			end
+			local delay = cfg.ACCEPT_DELAY
+			if EV_TIMEOUT == event then
+				if interface._connections >= cfg.MAX_CONNECTIONS then  -- check connection count
+					debug( "to many connections, seconds to wait for next accept:", delay )
+					return EV_TIMEOUT, delay  -- timeout...
+				else
+					return EV_READ  -- accept again
+				end
+			end
+			--vdebug("max connection check ok, accepting...")
+			local client, err = server:accept()    -- try to accept; TODO: check err
+			while client do
+				if interface._connections >= cfg.MAX_CONNECTIONS then
+					client:close( )  -- refuse connection
+					debug( "maximal connections reached, refuse client connection; accept delay:", delay )
+					return EV_TIMEOUT, delay  -- delay for next accept attemp
+				end
+				local ip, port = client:getpeername( )
+				interface._connections = interface._connections + 1  -- increase connection count
+				local clientinterface = handleclient( client, ip, port, interface, pattern, listener, nil, sslctx )
+				--vdebug( "client id:", clientinterface, "startssl:", startssl )
+				if startssl then
+					clientinterface:_start_ssl( clientinterface.onconnect )
+				else
+					clientinterface:_start_session( clientinterface.onconnect )
+				end
+				debug( "accepted incoming client connection from:", ip, port )
+				client, err = server:accept()    -- try to accept again
+			end
+			return EV_READ
+		end
+		
+		server:settimeout( 0 )
+		setmetatable(interface, interface_mt)
+		interfacelist( "add", interface )
+		interface:_start_session()
+		return interface
+	end
+end
+
+local addserver = ( function( )
+	return function( addr, port, listener, pattern, sslcfg, startssl )  -- TODO: check arguments
+		--vdebug( "creating new tcp server with following parameters:", addr or "nil", port or "nil", sslcfg or "nil", startssl or "nil")
+		local server, err = socket.bind( addr, port, cfg.ACCEPT_QUEUE )  -- create server socket
+		if not server then
+			debug( "creating server socket failed because:", err )
+			return nil, err
+		end
+		local sslctx
+		if sslcfg then
+			if not ssl then
+				debug "fatal error: luasec not found"
+				return nil, "luasec not found"
+			end
+			sslctx, err = ssl.newcontext( sslcfg )
+			if err then
+				debug( "error while creating new ssl context for server socket:", err )
+				return nil, err
+			end
+		end      
+		local interface = handleserver( server, addr, port, pattern, listener, sslctx, startssl )  -- new server handler
+		debug( "new server created with id:", tostring(interface))
+		return interface
+	end
+end )( )
+
+local addclient, wrapclient
+do
+	function wrapclient( client, ip, port, listeners, pattern, sslctx, startssl )
+		local interface = handleclient( client, ip, port, nil, pattern, listeners, sslctx )
+		interface:_start_session()
+		return interface
+		--function handleclient( client, ip, port, server, pattern, listener, _, sslctx )  -- creates an client interface
+	end
+	
+	function addclient( addr, serverport, listener, pattern, localaddr, localport, sslcfg, startssl )
+		local client, err = socket.tcp()  -- creating new socket
+		if not client then
+			debug( "cannot create socket:", err ) 
+			return nil, err
+		end
+		client:settimeout( 0 )  -- set nonblocking
+		if localaddr then
+			local res, err = client:bind( localaddr, localport, -1 )
+			if not res then
+				debug( "cannot bind client:", err )
+				return nil, err
+			end
+		end
+		local sslctx
+		if sslcfg then  -- handle ssl/new context
+			if not ssl then
+				debug "need luasec, but not available" 
+				return nil, "luasec not found"
+			end
+			sslctx, err = ssl.newcontext( sslcfg )
+			if err then
+				debug( "cannot create new ssl context:", err )
+				return nil, err
+			end
+		end
+		local res, err = client:connect( addr, serverport )  -- connect
+		if res or ( err == "timeout" ) then
+			local ip, port = client:getsockname( )
+			local server = function( )
+				return nil, "this is a dummy server interface"
+			end
+			local interface = wrapclient( client, ip, serverport, listeners, pattern, sslctx, startssl )
+			interface:_start_connection( startssl )
+			debug( "new connection id:", interface.id )
+			return interface, err
+		else
+			debug( "new connection failed:", err )
+			return nil, err
+		end
+	end
+end
+
+
+local loop = function( )  -- starts the event loop
+	return base:loop( )
+end
+
+local newevent = ( function( )
+	local add = base.addevent
+	return function( ... )
+		return add( base, ... )
+	end
+end )( )
+
+local closeallservers = function( arg )
+	for _, item in ipairs( interfacelist( ) ) do
+		if item "type" == "server" then
+			item( "close", arg )
+		end
+	end
+end
+
+return {
+
+	cfg = cfg,
+	base = base,
+	loop = loop,
+	event = event,
+	event_base = base,
+	addevent = newevent,
+	addserver = addserver,
+	addclient = addclient,
+	wrapclient = wrapclient,
+	closeallservers = closeallservers,
+
+	__NAME = SCRIPT_NAME,
+	__DATE = LAST_MODIFIED,
+	__AUTHOR = SCRIPT_AUTHOR,
+	__VERSION = SCRIPT_VERSION,
+
+}