Diff

--- a/net/server_event.lua	Thu Sep 24 20:15:19 2015 +0200
+++ b/net/server_event.lua	Fri Sep 25 18:03:44 2015 +0200
@@ -11,6 +11,7 @@
 			-- when using luasec, there are 4 cases of timeout errors: wantread or wantwrite during reading or writing
 
 --]]
+-- luacheck: ignore 212/self 431/err 211/ret
 
 local SCRIPT_NAME           = "server_event.lua"
 local SCRIPT_VERSION        = "0.05"
@@ -32,20 +33,24 @@
 	DEBUG                 = true,  -- show debug messages
 }
 
-local function use(x) return rawget(_G, x); end
-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 pairs = pairs
+local select = select
+local require = require
+local tostring = tostring
+local setmetatable = setmetatable
 
 local t_insert = table.insert
 local t_concat = table.concat
+local s_sub = string.sub
+
+local coroutine_wrap = coroutine.wrap
+local coroutine_yield = coroutine.yield
 
 local has_luasec, ssl = pcall ( require , "ssl" )
-local socket = use "socket" or require "socket"
+local socket = require "socket"
+local levent = require "luaevent.core"
+
+local socket_gettime = socket.gettime
 local getaddrinfo = socket.dns.getaddrinfo
 
 local log = require ("util.logger").init("socket")
@@ -53,7 +58,7 @@
 local function debug(...)
 	return log("debug", ("%s "):rep(select('#', ...)), ...)
 end
-local vdebug = debug;
+-- local vdebug = debug;
 
 local bitor = ( function( ) -- thx Rici Lake
 	local hasbit = function( x, p )
@@ -73,728 +78,671 @@
 	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_SIGNAL = event.EV_SIGNAL
+local base = levent.new( )
+local addevent = base.addevent
+local EV_READ = levent.EV_READ
+local EV_WRITE = levent.EV_WRITE
+local EV_TIMEOUT = levent.EV_TIMEOUT
+local EV_SIGNAL = levent.EV_SIGNAL
 
 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 )( )
+local interfacelist = { }
 
 -- 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 interface_mt = {}; interface_mt.__index = interface_mt;
 
-	-- Private methods
-	function interface_mt:_position(new_position)
-			self.position = new_position or self.position
-			return self.position;
-	end
-	function interface_mt:_close()
-		return self:_destroy();
-	end
+-- Private methods
+function interface_mt:_close()
+	return self:_destroy();
+end
 
-	function interface_mt:_start_connection(plainssl) -- called from wrapclient
-			local callback = function( event )
-				if EV_TIMEOUT == event then  -- timeout 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 and has_luasec then  -- start ssl session
-						self:starttls(self._sslctx, true)
-					else  -- normal connection
-						self:_start_session(true)
-					end
-					debug( "new connection established. id:", self.id )
-				end
-				self.eventconnect = nil
-				return -1
+function interface_mt:_start_connection(plainssl) -- called from wrapclient
+	local callback = function( event )
+		if EV_TIMEOUT == event then  -- timeout 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 and has_luasec then  -- start ssl session
+				self:starttls(self._sslctx, true)
+			else  -- normal connection
+				self:_start_session(true)
+			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(call_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
+			if call_onconnect then
+				self:onconnect()
 			end
-			self.eventconnect = addevent( base, self.conn, EV_WRITE, callback, cfg.CONNECT_TIMEOUT )
-			return true
+			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(call_onconnect) -- 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 call_onconnect 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
-	function interface_mt:_start_session(call_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
-				if call_onconnect then
-					self:onconnect()
+	self.conn:settimeout( 0 )  -- set non blocking
+	local handshakecallback = coroutine_wrap(function( event )
+		local _, err
+		local attempt = 0
+		local maxattempt = cfg.MAX_HANDSHAKE_ATTEMPTS
+		while attempt < maxattempt do  -- no endless loop
+			attempt = attempt + 1
+			debug( "ssl handshake of client with id:"..tostring(self)..", attempt:"..attempt )
+			if attempt > maxattempt then
+				self.fatalerror = "max handshake attempts 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
+					if not call_onconnect then  -- trigger listener
+						self:onstatus("ssl-handshake-complete");
+					end
+					self:_start_session( call_onconnect )
+					debug( "ssl handshake done" )
+					self.eventhandshake = nil
+					return -1
 				end
-				self.eventsession = nil
-				return -1
+				if err == "wantwrite" then
+					event = EV_WRITE
+				elseif err == "wantread" then
+					event = EV_READ
+				else
+					debug( "ssl handshake error:", err )
+					self.fatalerror = err
+				end
 			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(call_onconnect) -- 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 self.fatalerror then
 				if call_onconnect then
 					self.ondisconnect = nil  -- dont call this when client isnt really connected
 				end
 				self:_close()
-				debug( "fatal error while ssl wrapping:", err )
-				return false
+				debug( "handshake failed because:", self.fatalerror )
+				self.eventhandshake = nil
+				return -1
 			end
-			self.conn:settimeout( 0 )  -- set non blocking
-			local handshakecallback = coroutine_wrap(
-				function( event )
-					local _, err
-					local attempt = 0
-					local maxattempt = cfg.MAX_HANDSHAKE_ATTEMPTS
-					while attempt < maxattempt do  -- no endless loop
-						attempt = attempt + 1
-						debug( "ssl handshake of client with id:"..tostring(self)..", attempt:"..attempt )
-						if attempt > maxattempt then
-							self.fatalerror = "max handshake attempts 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
-								if not call_onconnect then  -- trigger listener
-									self:onstatus("ssl-handshake-complete");
-								end
-								self:_start_session( call_onconnect )
-								debug( "ssl handshake done" )
-								self.eventhandshake = nil
-								return -1
-							end
-							if err == "wantwrite" then
-								event = EV_WRITE
-							elseif err == "wantread" then
-								event = EV_READ
-							else
-								debug( "ssl handshake error:", err )
-								self.fatalerror = err
-							end
-						end
-						if self.fatalerror then
-							if call_onconnect 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.fatalerror )
-			self:_lock( true, true, true )  -- first of all, lock the interface to avoid further actions
-			local _
-			_ = self.eventread and self.eventread:close( )
-			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 ~= "client to close" and self.fatalerror)  -- call ondisconnect listener (wont be the case if handshake failed on connect)
-				_ = self.conn and self.conn:close( ) -- close connection
-				_ = 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
-
-	--TODO: Deprecate
-	function interface_mt:lock_read(switch)
-		if switch then
-			return self:pause();
-		else
-			return self:resume();
+			event = coroutine_yield( event, cfg.HANDSHAKE_TIMEOUT )  -- yield this monster...
 		end
 	end
-
-	function interface_mt:pause()
-		return self:_lock(self.nointerface, true, self.nowriting);
+	)
+	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.fatalerror )
+	self:_lock( true, true, true )  -- first of all, lock the interface to avoid further actions
+	local _
+	_ = self.eventread and self.eventread:close( )
+	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 ~= "client to close" and self.fatalerror)  -- call ondisconnect listener (wont be the case if handshake failed on connect)
+		_ = self.conn and self.conn:close( ) -- close connection
+		_ = 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[ self ] = nil
+	return true
+end
 
-	function interface_mt:resume()
-		self:_lock(self.nointerface, false, self.nowriting);
-		if not self.eventread then
-			self.eventread = addevent( base, self.conn, EV_READ, self.readcallback, cfg.READ_TIMEOUT );  -- register callback
-		end
-	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
+--TODO: Deprecate
+function interface_mt:lock_read(switch)
+	if switch then
+		return self:pause();
+	else
+		return self:resume();
 	end
+end
+
+function interface_mt:pause()
+	return self:_lock(self.nointerface, true, self.nowriting);
+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 = #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
+function interface_mt:resume()
+	self:_lock(self.nointerface, false, self.nowriting);
+	if not self.eventread then
+		self.eventread = addevent( base, self.conn, EV_READ, self.readcallback, cfg.READ_TIMEOUT );  -- register callback
+	end
+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 = #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
+	t_insert(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()
+	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 self.eventwrite then -- wait for incomplete write request
+			self:_lock( true, true, false )
+			debug "closing delayed until writebuffer is empty"
+			return nil, "writebuffer not empty, waiting"
+		else -- close now
+			self:_lock( true, true, true )
+			self:_close()
+			return true
 		end
-		t_insert(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
+	else
+		debug( "try to close server with id:", tostring(self.id))
+		self.fatalerror = "server to close"
+		self:_lock( true )
+		self:_close( 0 )
 		return true
 	end
-	function interface_mt:close()
-		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 self.eventwrite then -- wait for incomplete write request
-				self:_lock( true, true, false )
-				debug "closing delayed until writebuffer is empty"
-				return nil, "writebuffer not empty, waiting"
-			else -- close now
-				self:_lock( true, true, true )
-				self:_close()
-				return true
-			end
-		else
-			debug( "try to close server with id:", tostring(self.id))
-			self.fatalerror = "server to close"
-			self:_lock( true )
-			self:_close( 0 )
-			return true
-		end
-	end
+end
+
+function interface_mt:socket()
+	return self.conn
+end
+
+function interface_mt:server()
+	return self._server or self;
+end
+
+function interface_mt:port()
+	return self._port
+end
+
+function interface_mt:serverport()
+	return self._serverport
+end
+
+function interface_mt:ip()
+	return self._ip
+end
 
-	function interface_mt:socket()
-		return self.conn
-	end
+function interface_mt:ssl()
+	return self._usingssl
+end
+interface_mt.clientport = interface_mt.port -- COMPAT server_select
+
+function interface_mt:type()
+	return self._type or "client"
+end
 
-	function interface_mt:server()
-		return self._server or self;
-	end
+function interface_mt:connections()
+	return self._connections
+end
 
-	function interface_mt:port()
-		return self._port
+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
-
-	function interface_mt:serverport()
-		return self._serverport
-	end
+end
 
-	function interface_mt:ip()
-		return self._ip
-	end
-
-	function interface_mt:ssl()
-		return self._usingssl
-	end
-	interface_mt.clientport = interface_mt.port -- COMPAT server_select
-
-	function interface_mt:type()
-		return self._type or "client"
+function interface_mt:set_mode(pattern)
+	if pattern then
+		self._pattern = pattern;
 	end
-
-	function interface_mt:connections()
-		return self._connections
-	end
-
-	function interface_mt:address()
-		return self.addr
-	end
+	return self._pattern;
+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) -- luacheck: ignore 212
+	-- No-op, we always use the underlying connection's send
+end
 
-	function interface_mt:set_mode(pattern)
-		if pattern then
-			self._pattern = pattern;
-		end
-		return self._pattern;
+function interface_mt:starttls(sslctx, call_onconnect)
+	debug( "try to start ssl at client id:", self.id )
+	local err
+	self._sslctx = sslctx;
+	if self._usingssl then  -- startssl was already called
+		err = "ssl already active"
+	end
+	if err then
+		debug( "error:", err )
+		return nil, err
 	end
-
-	function interface_mt:set_send(new_send)
-		-- No-op, we always use the underlying connection's send
+	self._usingssl = true
+	self.startsslcallback = function( )  -- we have to start the handshake outside of a read/write event
+		self.startsslcallback = nil
+		self:_start_ssl(call_onconnect);
+		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
+	self.starttls = false;
+	return true
+end
 
-	function interface_mt:starttls(sslctx, call_onconnect)
-		debug( "try to start ssl at client id:", self.id )
-		local err
-		self._sslctx = sslctx;
-		if 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(call_onconnect);
-			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
-		self.starttls = false;
-		return true
+function interface_mt:setoption(option, value)
+	if self.conn.setoption then
+		return self.conn:setoption(option, value);
 	end
+	return false, "setoption not implemented";
+end
+
+function interface_mt:setlistener(listener)
+	self:ondetach(); -- Notify listener that it is no longer responsible for this connection
+	self.onconnect, self.ondisconnect, self.onincoming, self.ontimeout,
+	self.onreadtimeout, self.onstatus, self.ondetach
+		= listener.onconnect, listener.ondisconnect, listener.onincoming, listener.ontimeout,
+		  listener.onreadtimeout, listener.onstatus, listener.ondetach;
+end
 
-	function interface_mt:setoption(option, value)
-		if self.conn.setoption then
-			return self.conn:setoption(option, value);
-		end
-		return false, "setoption not implemented";
-	end
-
-	function interface_mt:setlistener(listener)
-		self:ondetach(); -- Notify listener that it is no longer responsible for this connection
-		self.onconnect, self.ondisconnect, self.onincoming, self.ontimeout,
-		self.onreadtimeout, self.onstatus, self.ondetach
-			= listener.onconnect, listener.ondisconnect, listener.onincoming, listener.ontimeout,
-			  listener.onreadtimeout, listener.onstatus, listener.ondetach;
-	end
-
-	-- Stub handlers
-	function interface_mt:onconnect()
-	end
-	function interface_mt:onincoming()
-	end
-	function interface_mt:ondisconnect()
-	end
-	function interface_mt:ontimeout()
-	end
-	function interface_mt:onreadtimeout()
-		self.fatalerror = "timeout during receiving"
-		debug( "connection failed:", self.fatalerror )
-		self:_close()
-		self.eventread = nil
-	end
-	function interface_mt:ondrain()
-	end
-	function interface_mt:ondetach()
-	end
-	function interface_mt:onstatus()
-	end
+-- Stub handlers
+function interface_mt:onconnect()
+end
+function interface_mt:onincoming()
+end
+function interface_mt:ondisconnect()
+end
+function interface_mt:ontimeout()
+end
+function interface_mt:onreadtimeout()
+	self.fatalerror = "timeout during receiving"
+	debug( "connection failed:", self.fatalerror )
+	self:_close()
+	self.eventread = nil
+end
+function interface_mt:ondrain()
+end
+function interface_mt:ondetach()
+end
+function interface_mt:onstatus()
 end
 
 -- End of client interface methods
 
-local handleclient;
-do
-	local string_sub = string.sub  -- caching table lookups
-	local addevent = base.addevent
-	local socket_gettime = socket.gettime
-	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
-			onreadtimeout = listener.onreadtimeout; -- called when socket inactivity timeout occurs
-			ondrain = listener.ondrain; -- called when writebuffer is empty
-			ondetach = listener.ondetach; -- called when disassociating this listener from this connection
-			onstatus = listener.onstatus; -- called for status changes (e.g. of SSL/TLS)
-			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
+local 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
+		onreadtimeout = listener.onreadtimeout; -- called when socket inactivity timeout occurs
+		ondrain = listener.ondrain; -- called when writebuffer is empty
+		ondetach = listener.ondetach; -- called when disassociating this listener from this connection
+		onstatus = listener.onstatus; -- called for status changes (e.g. of SSL/TLS)
+		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,
-			_serverport = (server and server:port() or nil),
-			_sslctx = sslctx; -- parameters
-			_usingssl = false;  -- client is using ssl;
-		}
-		if not has_luasec then interface.starttls = false; end
-		interface.id = tostring(interface):match("%x+$");
-		interface.writecallback = function( event )  -- called on write events
-			--vdebug( "new client write event, id/ip/port:", interface, ip, port )
-			if interface.nowriting or ( interface.fatalerror and ( "client to close" ~= interface.fatalerror ) ) then  -- leave this event
-				--vdebug( "leaving this event because:", interface.nowriting or interface.fatalerror )
-				interface.eventwrite = false
+		-- Properties
+		_ip = ip, _port = port, _server = server, _pattern = pattern,
+		_serverport = (server and server:port() or nil),
+		_sslctx = sslctx; -- parameters
+		_usingssl = false;  -- client is using ssl;
+	}
+	if not has_luasec then interface.starttls = false; end
+	interface.id = tostring(interface):match("%x+$");
+	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
+			interface.writebuffer = { t_concat(interface.writebuffer) }
+			local succ, err, byte = interface.conn:send( interface.writebuffer[1], 1, interface.writebufferlen )
+			--vdebug( "write data:", interface.writebuffer, "error:", err, "part:", byte )
+			if succ then  -- writing succesful
+				interface.writebuffer[1] = nil
+				interface.writebufferlen = 0
+				interface:ondrain();
+				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 and (err == "timeout" or err == "wantwrite") then  -- want write again
+				--vdebug( "writebuffer is not empty:", err )
+				interface.writebuffer[1] = s_sub( interface.writebuffer[1], 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 -1;
+					end
+					interface.eventwritetimeout = addevent( base, nil, EV_TIMEOUT, callback, cfg.WRITE_TIMEOUT )  -- reg a new timeout event
+					debug( "wantread during write attempt, 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
-			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
-				interface.writebuffer = { t_concat(interface.writebuffer) }
-				local succ, err, byte = interface.conn:send( interface.writebuffer[1], 1, interface.writebufferlen )
-				--vdebug( "write data:", interface.writebuffer, "error:", err, "part:", byte )
-				if succ then  -- writing succesful
-					interface.writebuffer[1] = nil
-					interface.writebufferlen = 0
-					interface:ondrain();
-					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 and (err == "timeout" or err == "wantwrite") then  -- want write again
-					--vdebug( "writebuffer is not empty:", err )
-					interface.writebuffer[1] = string_sub( interface.writebuffer[1], 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 -1;
-						end
-						interface.eventwritetimeout = addevent( base, nil, EV_TIMEOUT, callback, cfg.WRITE_TIMEOUT )  -- reg a new timeout event
-						debug( "wantread during write attempt, 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 and interface:onreadtimeout() ~= true then
+			return -1 -- took too long to get some data from client -> disconnect
+		end
+		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
-
-		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 and interface:onreadtimeout() ~= true then
-				return -1 -- took too long to get some data from client -> disconnect
-			end
-			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) )
+		local buffer, err, part = interface.conn:receive( interface._pattern )  -- receive buffer with "pattern"
+		--vdebug( "read data:", tostring(buffer), "error:", tostring(err), "part:", tostring(part) )
+		buffer = buffer or part
+		if buffer and #buffer > 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
+		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
-				if interface.eventreadtimeout then
-					interface.eventreadtimeout:close( )
-					interface.eventreadtimeout = nil
-				end
-			end
-			local buffer, err, part = interface.conn:receive( interface._pattern )  -- receive buffer with "pattern"
-			--vdebug( "read data:", tostring(buffer), "error:", tostring(err), "part:", tostring(part) )
-			buffer = buffer or part
-			if buffer and #buffer > cfg.MAX_READ_LENGTH then  -- check buffer length
-				interface.fatalerror = "receive buffer exceeded"
-				debug( "fatal error:", interface.fatalerror )
+				interface.eventreadtimeout = addevent( base, nil, EV_TIMEOUT,
+					function( )
+						interface:_close()
+					end, cfg.READ_TIMEOUT
+				)
+				debug( "wantwrite during read attempt, 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
-			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 attempt, 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
+		else
+			interface.onincoming( interface, buffer, err )  -- send new data to listener
+		end
+		if interface.noreading then
+			interface.eventread = nil;
+			return -1;
+		end
+		return EV_READ, cfg.READ_TIMEOUT
+	end
+
+	client:settimeout( 0 )  -- set non blocking
+	setmetatable(interface, interface_mt)
+	interfacelist[ interface ] = true  -- add to interfacelist
+	return interface
+end
+
+local function handleserver( server, addr, port, pattern, listener, sslctx )  -- 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
+
+		_ip = addr, _port = port, _pattern = pattern,
+		_sslctx = sslctx;
+	}
+	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 attempt
+			end
+			local client_ip, client_port = client:getpeername( )
+			interface._connections = interface._connections + 1  -- increase connection count
+			local clientinterface = handleclient( client, client_ip, client_port, interface, pattern, listener, sslctx )
+			--vdebug( "client id:", clientinterface, "startssl:", startssl )
+			if has_luasec and sslctx then
+				clientinterface:starttls(sslctx, true)
 			else
-				interface.onincoming( interface, buffer, err )  -- send new data to listener
-			end
-			if interface.noreading then
-				interface.eventread = nil;
-				return -1;
+				clientinterface:_start_session( true )
 			end
-			return EV_READ, cfg.READ_TIMEOUT
+			debug( "accepted incoming client connection from:", client_ip or "<unknown IP>", client_port or "<unknown port>", "to", port or "<unknown port>");
+
+			client, err = server:accept()    -- try to accept again
 		end
+		return EV_READ
+	end
+
+	server:settimeout( 0 )
+	setmetatable(interface, interface_mt)
+	interfacelist[ interface ] = true
+	interface:_start_session()
+	return interface
+end
+
+local function addserver( addr, port, listener, pattern, sslctx, startssl )  -- TODO: check arguments
+	--vdebug( "creating new tcp server with following parameters:", addr or "nil", port or "nil", sslctx or "nil", startssl or "nil")
+	if sslctx and not has_luasec then
+		debug "fatal error: luasec not found"
+		return nil, "luasec not found"
+	end
+	local server, err = socket.bind( addr, port, cfg.ACCEPT_QUEUE )  -- create server socket
+	if not server then
+		debug( "creating server socket on "..addr.." port "..port.." failed:", err )
+		return nil, err
+	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
 
-		client:settimeout( 0 )  -- set non blocking
-		setmetatable(interface, interface_mt)
-		interfacelist( "add", interface )  -- add to interfacelist
-		return interface
+local function wrapclient( client, ip, port, listeners, pattern, sslctx )
+	local interface = handleclient( client, ip, port, nil, pattern, listeners, sslctx )
+	interface:_start_connection(sslctx)
+	return interface, client
+	--function handleclient( client, ip, port, server, pattern, listener, _, sslctx )  -- creates an client interface
+end
+
+local function addclient( addr, serverport, listener, pattern, sslctx, typ )
+	if sslctx and not has_luasec then
+		debug "need luasec, but not available"
+		return nil, "luasec not found"
+	end
+	if getaddrinfo and not typ then
+		local addrinfo, err = getaddrinfo(addr)
+		if not addrinfo then return nil, err end
+		if addrinfo[1] and addrinfo[1].family == "inet6" then
+			typ = "tcp6"
+		end
+	end
+	local create = socket[typ or "tcp"]
+	if type( create ) ~= "function"  then
+		return nil, "invalid socket type"
+	end
+	local client, err = create()  -- creating new socket
+	if not client then
+		debug( "cannot create socket:", err )
+		return nil, err
+	end
+	client:settimeout( 0 )  -- set nonblocking
+	local res, err = client:connect( addr, serverport )  -- connect
+	if res or ( err == "timeout" or err == "Operation already in progress" ) then
+		if client.getsockname then
+			addr = client:getsockname( )
+		end
+		local interface = wrapclient( client, addr, serverport, listener, pattern, sslctx )
+		debug( "new connection id:", interface.id )
+		return interface, err
+	else
+		debug( "new connection failed:", err )
+		return nil, err
 	end
 end
 
-local handleserver
-do
-	function handleserver( server, addr, port, pattern, listener, sslctx )  -- 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
-
-			_ip = addr, _port = port, _pattern = pattern,
-			_sslctx = sslctx;
-		}
-		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 attempt
-				end
-				local client_ip, client_port = client:getpeername( )
-				interface._connections = interface._connections + 1  -- increase connection count
-				local clientinterface = handleclient( client, client_ip, client_port, interface, pattern, listener, sslctx )
-				--vdebug( "client id:", clientinterface, "startssl:", startssl )
-				if has_luasec and sslctx then
-					clientinterface:starttls(sslctx, true)
-				else
-					clientinterface:_start_session( true )
-				end
-				debug( "accepted incoming client connection from:", client_ip or "<unknown IP>", client_port or "<unknown port>", "to", port or "<unknown 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, sslctx, startssl )  -- TODO: check arguments
-		--vdebug( "creating new tcp server with following parameters:", addr or "nil", port or "nil", sslctx or "nil", startssl or "nil")
-		if sslctx and not has_luasec then
-			debug "fatal error: luasec not found"
-			return nil, "luasec not found"
-		end
-		local server, err = socket.bind( addr, port, cfg.ACCEPT_QUEUE )  -- create server socket
-		if not server then
-			debug( "creating server socket on "..addr.." port "..port.." failed:", err )
-			return nil, err
-		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 )
-		local interface = handleclient( client, ip, port, nil, pattern, listeners, sslctx )
-		interface:_start_connection(sslctx)
-		return interface, client
-		--function handleclient( client, ip, port, server, pattern, listener, _, sslctx )  -- creates an client interface
-	end
-
-	function addclient( addr, serverport, listener, pattern, sslctx, typ )
-		if sslctx and not has_luasec then
-			debug "need luasec, but not available"
-			return nil, "luasec not found"
-		end
-		if getaddrinfo and not typ then
-			local addrinfo, err = getaddrinfo(addr)
-			if not addrinfo then return nil, err end
-			if addrinfo[1] and addrinfo[1].family == "inet6" then
-				typ = "tcp6"
-			end
-		end
-		local create = socket[typ or "tcp"]
-		if type( create ) ~= "function"  then
-			return nil, "invalid socket type"
-			end
-		local client, err = create()  -- creating new socket
-		if not client then
-			debug( "cannot create socket:", err )
-				return nil, err
-			end
-		client:settimeout( 0 )  -- set nonblocking
-		local res, err = client:connect( addr, serverport )  -- connect
-		if res or ( err == "timeout" or err == "Operation already in progress" ) then
-			if client.getsockname then
-				addr = client:getsockname( )
-		end
-			local interface = wrapclient( client, addr, serverport, listener, pattern, sslctx )
-			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
+local function loop( )  -- starts the event loop
 	base:loop( )
 	return "quitting";
 end
 
-local newevent = ( function( )
-	local add = base.addevent
-	return function( ... )
-		return add( base, ... )
+local function newevent( ... )
+	return addevent( base, ... )
 	end
-end )( )
 
-local closeallservers = function( arg )
-	for _, item in ipairs( interfacelist( ) ) do
+local function closeallservers ( arg )
+	for item in pairs( interfacelist ) do
 		if item.type == "server" then
 			item:close( arg )
 		end
@@ -817,7 +765,7 @@
 -- being garbage-collected
 local signal_events = {}; -- [signal_num] -> event object
 local function hook_signal(signal_num, handler)
-	local function _handler(event)
+	local function _handler()
 		local ret = handler();
 		if ret ~= false then -- Continue handling this signal?
 			return EV_SIGNAL; -- Yes
@@ -866,12 +814,11 @@
 end
 
 return {
-
 	cfg = cfg,
 	base = base,
 	loop = loop,
 	link = link,
-	event = event,
+	event = levent,
 	event_base = base,
 	addevent = newevent,
 	addserver = addserver,