2 -- server.lua by blastbeat of the luadch project
3 -- Re-used here under the MIT/X Consortium License
5 -- Modifications (C) 2008-2010 Matthew Wild, Waqas Hussain
8 -- // wrapping luadch stuff // --
10 local use = function( what )
14 local log, table_concat = require ("util.logger").init("socket"), table.concat;
15 local out_put = function (...) return log("debug", table_concat{...}); end
16 local out_error = function (...) return log("warn", table_concat{...}); end
18 ----------------------------------// DECLARATION //--
22 local STAT_UNIT = 1 -- byte
24 --// lua functions //--
26 local type = use "type"
27 local pairs = use "pairs"
28 local ipairs = use "ipairs"
29 local tonumber = use "tonumber"
30 local tostring = use "tostring"
35 local table = use "table"
36 local string = use "string"
37 local coroutine = use "coroutine"
39 --// lua lib methods //--
41 local os_difftime = os.difftime
42 local math_min = math.min
43 local math_huge = math.huge
44 local table_concat = table.concat
45 local string_sub = string.sub
46 local coroutine_wrap = coroutine.wrap
47 local coroutine_yield = coroutine.yield
51 local luasec = use "ssl"
52 local luasocket = use "socket" or require "socket"
53 local luasocket_gettime = luasocket.gettime
55 --// extern lib methods //--
57 local ssl_wrap = ( luasec and luasec.wrap )
58 local socket_bind = luasocket.bind
59 local socket_sleep = luasocket.sleep
60 local socket_select = luasocket.select
92 --// simple data types //--
121 local _maxsslhandshake
123 ----------------------------------// DEFINITION //--
125 _server = { } -- key = port, value = table; list of listening servers
126 _readlist = { } -- array with sockets to read from
127 _sendlist = { } -- arrary with sockets to write to
128 _timerlist = { } -- array of timer functions
129 _socketlist = { } -- key = socket, value = wrapped socket (handlers)
130 _readtimes = { } -- key = handler, value = timestamp of last data reading
131 _writetimes = { } -- key = handler, value = timestamp of last data writing/sending
132 _closelist = { } -- handlers to close
134 _readlistlen = 0 -- length of readlist
135 _sendlistlen = 0 -- length of sendlist
136 _timerlistlen = 0 -- lenght of timerlist
138 _sendtraffic = 0 -- some stats
141 _selecttimeout = 1 -- timeout of socket.select
142 _sleeptime = 0 -- time to wait at the end of every loop
143 _tcpbacklog = 128 -- some kind of hint to the OS
145 _maxsendlen = 51000 * 1024 -- max len of send buffer
146 _maxreadlen = 25000 * 1024 -- max len of read buffer
148 _checkinterval = 30 -- interval in secs to check idle clients
149 _sendtimeout = 60000 -- allowed send idle time in secs
150 _readtimeout = 6 * 60 * 60 -- allowed read idle time in secs
152 local is_windows = package.config:sub(1,1) == "\\" -- check the directory separator, to detemine whether this is Windows
153 _maxfd = (is_windows and math.huge) or luasocket._SETSIZE or 1024 -- max fd number, limit to 1024 by default to prevent glibc buffer overflow, but not on Windows
154 _maxselectlen = luasocket._SETSIZE or 1024 -- But this still applies on Windows
156 _maxsslhandshake = 30 -- max handshake round-trips
158 ----------------------------------// PRIVATE //--
160 wrapserver = function( listeners, socket, ip, serverport, pattern, sslctx ) -- this function wraps a server -- FIXME Make sure FD < _maxfd
162 if socket:getfd() >= _maxfd then
163 out_error("server.lua: Disallowed FD number: "..socket:getfd())
165 return nil, "fd-too-large"
168 local connections = 0
170 local dispatch, disconnect = listeners.onconnect, listeners.ondisconnect
172 local accept = socket.accept
174 --// public methods of the object //--
178 handler.shutdown = function( ) end
180 handler.ssl = function( )
183 handler.sslctx = function( )
186 handler.remove = function( )
187 connections = connections - 1
192 handler.close = function()
194 _sendlistlen = removesocket( _sendlist, socket, _sendlistlen )
195 _readlistlen = removesocket( _readlist, socket, _readlistlen )
196 _server[ip..":"..serverport] = nil;
197 _socketlist[ socket ] = nil
201 out_put "server.lua: closed server handler and removed sockets from list"
203 handler.pause = function( hard )
204 if not handler.paused then
205 _readlistlen = removesocket( _readlist, socket, _readlistlen )
207 _socketlist[ socket ] = nil
211 handler.paused = true;
214 handler.resume = function( )
215 if handler.paused then
217 socket = socket_bind( ip, serverport, _tcpbacklog );
218 socket:settimeout( 0 )
220 _readlistlen = addsocket(_readlist, socket, _readlistlen)
221 _socketlist[ socket ] = handler
222 handler.paused = false;
225 handler.ip = function( )
228 handler.serverport = function( )
231 handler.socket = function( )
234 handler.readbuffer = function( )
235 if _readlistlen >= _maxselectlen or _sendlistlen >= _maxselectlen then
237 out_put( "server.lua: refused new client connection: server full" )
240 local client, err = accept( socket ) -- try to accept
242 local ip, clientport = client:getpeername( )
243 local handler, client, err = wrapconnection( handler, listeners, client, ip, serverport, clientport, pattern, sslctx ) -- wrap new client socket
244 if err then -- error while wrapping ssl socket
247 connections = connections + 1
248 out_put( "server.lua: accepted new client connection from ", tostring(ip), ":", tostring(clientport), " to ", tostring(serverport))
249 if dispatch and not sslctx then -- SSL connections will notify onconnect when handshake completes
250 return dispatch( handler );
253 elseif err then -- maybe timeout or something else
254 out_put( "server.lua: error with new client connection: ", tostring(err) )
261 wrapconnection = function( server, listeners, socket, ip, serverport, clientport, pattern, sslctx ) -- this function wraps a client to a handler object
263 if socket:getfd() >= _maxfd then
264 out_error("server.lua: Disallowed FD number: "..socket:getfd()) -- PROTIP: Switch to libevent
265 socket:close( ) -- Should we send some kind of error here?
269 return nil, nil, "fd-too-large"
271 socket:settimeout( 0 )
273 --// local import of socket methods //--
279 --// private closures of the object //--
283 local dispatch = listeners.onincoming
284 local status = listeners.onstatus
285 local disconnect = listeners.ondisconnect
286 local drain = listeners.ondrain
287 local onreadtimeout = listeners.onreadtimeout;
288 local detach = listeners.ondetach
290 local bufferqueue = { } -- buffer array
291 local bufferqueuelen = 0 -- end of buffer array
302 local sendtraffic, readtraffic = 0, 0
304 local maxsendlen = _maxsendlen
305 local maxreadlen = _maxreadlen
307 --// public methods of the object //--
309 local handler = bufferqueue -- saves a table ^_^
311 handler.dispatch = function( )
314 handler.disconnect = function( )
317 handler.onreadtimeout = onreadtimeout;
319 handler.setlistener = function( self, listeners )
321 detach(self) -- Notify listener that it is no longer responsible for this connection
323 dispatch = listeners.onincoming
324 disconnect = listeners.ondisconnect
325 status = listeners.onstatus
326 drain = listeners.ondrain
327 handler.onreadtimeout = listeners.onreadtimeout
328 detach = listeners.ondetach
330 handler.getstats = function( )
331 return readtraffic, sendtraffic
333 handler.ssl = function( )
336 handler.sslctx = function ( )
339 handler.send = function( _, data, i, j )
340 return send( socket, data, i, j )
342 handler.receive = function( pattern, prefix )
343 return receive( socket, pattern, prefix )
345 handler.shutdown = function( pattern )
346 return shutdown( socket, pattern )
348 handler.setoption = function (self, option, value)
349 if socket.setoption then
350 return socket:setoption(option, value);
352 return false, "setoption not implemented";
354 handler.force_close = function ( self, err )
355 if bufferqueuelen ~= 0 then
356 out_put("server.lua: discarding unwritten data for ", tostring(ip), ":", tostring(clientport))
359 return self:close(err);
361 handler.close = function( self, err )
362 if not handler then return true; end
363 _readlistlen = removesocket( _readlist, socket, _readlistlen )
364 _readtimes[ handler ] = nil
365 if bufferqueuelen ~= 0 then
366 handler.sendbuffer() -- Try now to send any outstanding data
367 if bufferqueuelen ~= 0 then -- Still not empty, so we'll try again later
369 handler.write = nil -- ... but no further writing allowed
376 _ = shutdown and shutdown( socket )
378 _sendlistlen = removesocket( _sendlist, socket, _sendlistlen )
379 _socketlist[ socket ] = nil
382 out_put "server.lua: socket already closed"
385 _writetimes[ handler ] = nil
386 _closelist[ handler ] = nil
387 local _handler = handler;
390 disconnect(_handler, err or false);
397 out_put "server.lua: closed client handler and removed socket from list"
400 handler.ip = function( )
403 handler.serverport = function( )
406 handler.clientport = function( )
409 handler.port = handler.clientport -- COMPAT server_event
410 local write = function( self, data )
411 bufferlen = bufferlen + #data
412 if bufferlen > maxsendlen then
413 _closelist[ handler ] = "send buffer exceeded" -- cannot close the client at the moment, have to wait to the end of the cycle
414 handler.write = idfalse -- dont write anymore
416 elseif socket and not _sendlist[ socket ] then
417 _sendlistlen = addsocket(_sendlist, socket, _sendlistlen)
419 bufferqueuelen = bufferqueuelen + 1
420 bufferqueue[ bufferqueuelen ] = data
422 _writetimes[ handler ] = _writetimes[ handler ] or _currenttime
426 handler.write = write
427 handler.bufferqueue = function( self )
430 handler.socket = function( self )
433 handler.set_mode = function( self, new )
434 pattern = new or pattern
437 handler.set_send = function ( self, newsend )
438 send = newsend or send
441 handler.bufferlen = function( self, readlen, sendlen )
442 maxsendlen = sendlen or maxsendlen
443 maxreadlen = readlen or maxreadlen
444 return bufferlen, maxreadlen, maxsendlen
447 handler.lock_read = function (self, switch)
448 if switch == true then
449 local tmp = _readlistlen
450 _readlistlen = removesocket( _readlist, socket, _readlistlen )
451 _readtimes[ handler ] = nil
452 if _readlistlen ~= tmp then
455 elseif switch == false then
458 _readlistlen = addsocket(_readlist, socket, _readlistlen)
459 _readtimes[ handler ] = _currenttime
464 handler.pause = function (self)
465 return self:lock_read(true);
467 handler.resume = function (self)
468 return self:lock_read(false);
470 handler.lock = function( self, switch )
471 handler.lock_read (switch)
472 if switch == true then
473 handler.write = idfalse
474 local tmp = _sendlistlen
475 _sendlistlen = removesocket( _sendlist, socket, _sendlistlen )
476 _writetimes[ handler ] = nil
477 if _sendlistlen ~= tmp then
480 elseif switch == false then
481 handler.write = write
487 return noread, nosend
489 local _readbuffer = function( ) -- this function reads data
490 local buffer, err, part = receive( socket, pattern ) -- receive buffer with "pattern"
491 if not err or (err == "wantread" or err == "timeout") then -- received something
492 local buffer = buffer or part or ""
494 if len > maxreadlen then
495 handler:close( "receive buffer exceeded" )
498 local count = len * STAT_UNIT
499 readtraffic = readtraffic + count
500 _readtraffic = _readtraffic + count
501 _readtimes[ handler ] = _currenttime
502 --out_put( "server.lua: read data '", buffer:gsub("[^%w%p ]", "."), "', error: ", err )
503 return dispatch( handler, buffer, err )
504 else -- connections was closed or fatal error
505 out_put( "server.lua: client ", tostring(ip), ":", tostring(clientport), " read error: ", tostring(err) )
507 _ = handler and handler:force_close( err )
511 local _sendbuffer = function( ) -- this function sends data
512 local succ, err, byte, buffer, count;
514 buffer = table_concat( bufferqueue, "", 1, bufferqueuelen )
515 succ, err, byte = send( socket, buffer, 1, bufferlen )
516 count = ( succ or byte or 0 ) * STAT_UNIT
517 sendtraffic = sendtraffic + count
518 _sendtraffic = _sendtraffic + count
519 for i = bufferqueuelen,1,-1 do
520 bufferqueue[ i ] = nil
522 --out_put( "server.lua: sended '", buffer, "', bytes: ", tostring(succ), ", error: ", tostring(err), ", part: ", tostring(byte), ", to: ", tostring(ip), ":", tostring(clientport) )
524 succ, err, count = false, "unexpected close", 0;
526 if succ then -- sending succesful
529 _sendlistlen = removesocket( _sendlist, socket, _sendlistlen ) -- delete socket from writelist
530 _writetimes[ handler ] = nil
534 _ = needtls and handler:starttls(nil)
535 _ = toclose and handler:force_close( )
537 elseif byte and ( err == "timeout" or err == "wantwrite" ) then -- want write
538 buffer = string_sub( buffer, byte + 1, bufferlen ) -- new buffer
539 bufferqueue[ 1 ] = buffer -- insert new buffer in queue
541 bufferlen = bufferlen - byte
542 _writetimes[ handler ] = _currenttime
544 else -- connection was closed during sending or fatal error
545 out_put( "server.lua: client ", tostring(ip), ":", tostring(clientport), " write error: ", tostring(err) )
547 _ = handler and handler:force_close( err )
554 function handler.set_sslctx(self, new_sslctx)
557 handshake = coroutine_wrap( function( client ) -- create handshake coroutine
559 for i = 1, _maxsslhandshake do
560 _sendlistlen = ( wrote and removesocket( _sendlist, client, _sendlistlen ) ) or _sendlistlen
561 _readlistlen = ( read and removesocket( _readlist, client, _readlistlen ) ) or _readlistlen
562 read, wrote = nil, nil
563 _, err = client:dohandshake( )
565 out_put( "server.lua: ssl handshake done" )
566 handler.readbuffer = _readbuffer -- when handshake is done, replace the handshake function with regular functions
567 handler.sendbuffer = _sendbuffer
568 _ = status and status( handler, "ssl-handshake-complete" )
569 if self.autostart_ssl and listeners.onconnect then
570 listeners.onconnect(self);
571 if bufferqueuelen ~= 0 then
572 _sendlistlen = addsocket(_sendlist, client, _sendlistlen)
575 _readlistlen = addsocket(_readlist, client, _readlistlen)
578 if err == "wantwrite" then
579 _sendlistlen = addsocket(_sendlist, client, _sendlistlen)
581 elseif err == "wantread" then
582 _readlistlen = addsocket(_readlist, client, _readlistlen)
588 coroutine_yield( ) -- handshake not finished
591 out_put( "server.lua: ssl handshake error: ", tostring(err or "handshake too long") )
592 _ = handler and handler:force_close("ssl handshake failed")
593 return false, err -- handshake failed
598 handler.starttls = function( self, _sslctx)
600 handler:set_sslctx(_sslctx);
602 if bufferqueuelen > 0 then
603 out_put "server.lua: we need to do tls, but delaying until send buffer empty"
607 out_put( "server.lua: attempting to start tls on " .. tostring( socket ) )
608 local oldsocket, err = socket
609 socket, err = ssl_wrap( socket, sslctx ) -- wrap socket
611 out_put( "server.lua: error while starting tls on client: ", tostring(err or "unknown error") )
612 return nil, err -- fatal error
615 socket:settimeout( 0 )
617 -- add the new socket to our system
619 receive = socket.receive
621 _socketlist[ socket ] = handler
622 _readlistlen = addsocket(_readlist, socket, _readlistlen)
624 -- remove traces of the old socket
625 _readlistlen = removesocket( _readlist, oldsocket, _readlistlen )
626 _sendlistlen = removesocket( _sendlist, oldsocket, _sendlistlen )
627 _socketlist[ oldsocket ] = nil
629 handler.starttls = nil
632 -- Secure now (if handshake fails connection will close)
635 handler.readbuffer = handshake
636 handler.sendbuffer = handshake
637 return handshake( socket ) -- do handshake
641 handler.readbuffer = _readbuffer
642 handler.sendbuffer = _sendbuffer
644 receive = socket.receive
645 shutdown = ( ssl and id ) or socket.shutdown
647 _socketlist[ socket ] = handler
648 _readlistlen = addsocket(_readlist, socket, _readlistlen)
650 if sslctx and luasec then
651 out_put "server.lua: auto-starting ssl negotiation..."
652 handler.autostart_ssl = true;
653 local ok, err = handler:starttls(sslctx);
659 return handler, socket
665 idfalse = function( )
669 addsocket = function( list, socket, len )
670 if not list[ socket ] then
678 removesocket = function( list, socket, len ) -- this function removes sockets from a list ( copied from copas )
679 local pos = list[ socket ]
682 local last = list[ len ]
684 if last ~= socket then
693 closesocket = function( socket )
694 _sendlistlen = removesocket( _sendlist, socket, _sendlistlen )
695 _readlistlen = removesocket( _readlist, socket, _readlistlen )
696 _socketlist[ socket ] = nil
701 local function link(sender, receiver, buffersize)
703 local _sendbuffer = receiver.sendbuffer;
704 function receiver.sendbuffer()
706 if sender_locked and receiver.bufferlen() < buffersize then
707 sender:lock_read(false); -- Unlock now
712 local _readbuffer = sender.readbuffer;
713 function sender.readbuffer()
715 if not sender_locked and receiver.bufferlen() >= buffersize then
716 sender_locked = true;
717 sender:lock_read(true);
720 sender:set_mode("*a");
723 ----------------------------------// PUBLIC //--
725 addserver = function( addr, port, listeners, pattern, sslctx ) -- this function provides a way for other scripts to reg a server
727 if type( listeners ) ~= "table" then
728 err = "invalid listener table"
730 if type( port ) ~= "number" or not ( port >= 0 and port <= 65535 ) then
732 elseif _server[ addr..":"..port ] then
733 err = "listeners on '[" .. addr .. "]:" .. port .. "' already exist"
734 elseif sslctx and not luasec then
735 err = "luasec not found"
738 out_error( "server.lua, [", addr, "]:", port, ": ", err )
742 local server, err = socket_bind( addr, port, _tcpbacklog )
744 out_error( "server.lua, [", addr, "]:", port, ": ", err )
747 local handler, err = wrapserver( listeners, server, addr, port, pattern, sslctx ) -- wrap new server socket
752 server:settimeout( 0 )
753 _readlistlen = addsocket(_readlist, server, _readlistlen)
754 _server[ addr..":"..port ] = handler
755 _socketlist[ server ] = handler
756 out_put( "server.lua: new "..(sslctx and "ssl " or "").."server listener on '[", addr, "]:", port, "'" )
760 getserver = function ( addr, port )
761 return _server[ addr..":"..port ];
764 removeserver = function( addr, port )
765 local handler = _server[ addr..":"..port ]
767 return nil, "no server found on '[" .. addr .. "]:" .. tostring( port ) .. "'"
770 _server[ addr..":"..port ] = nil
774 closeall = function( )
775 for _, handler in pairs( _socketlist ) do
777 _socketlist[ _ ] = nil
790 getsettings = function( )
792 select_timeout = _selecttimeout;
793 select_sleep_time = _sleeptime;
794 tcp_backlog = _tcpbacklog;
795 max_send_buffer_size = _maxsendlen;
796 max_receive_buffer_size = _maxreadlen;
797 select_idle_check_interval = _checkinterval;
798 send_timeout = _sendtimeout;
799 read_timeout = _readtimeout;
800 max_connections = _maxselectlen;
801 max_ssl_handshake_roundtrips = _maxsslhandshake;
802 highest_allowed_fd = _maxfd;
806 changesettings = function( new )
807 if type( new ) ~= "table" then
808 return nil, "invalid settings table"
810 _selecttimeout = tonumber( new.select_timeout ) or _selecttimeout
811 _sleeptime = tonumber( new.select_sleep_time ) or _sleeptime
812 _maxsendlen = tonumber( new.max_send_buffer_size ) or _maxsendlen
813 _maxreadlen = tonumber( new.max_receive_buffer_size ) or _maxreadlen
814 _checkinterval = tonumber( new.select_idle_check_interval ) or _checkinterval
815 _tcpbacklog = tonumber( new.tcp_backlog ) or _tcpbacklog
816 _sendtimeout = tonumber( new.send_timeout ) or _sendtimeout
817 _readtimeout = tonumber( new.read_timeout ) or _readtimeout
818 _maxselectlen = new.max_connections or _maxselectlen
819 _maxsslhandshake = new.max_ssl_handshake_roundtrips or _maxsslhandshake
820 _maxfd = new.highest_allowed_fd or _maxfd
824 addtimer = function( listener )
825 if type( listener ) ~= "function" then
826 return nil, "invalid listener function"
828 _timerlistlen = _timerlistlen + 1
829 _timerlist[ _timerlistlen ] = listener
834 return _readtraffic, _sendtraffic, _readlistlen, _sendlistlen, _timerlistlen
839 local function setquitting(quit)
840 quitting = not not quit;
843 loop = function(once) -- this is the main loop of the program
844 if quitting then return "quitting"; end
845 if once then quitting = "once"; end
846 local next_timer_time = math_huge;
848 local read, write, err = socket_select( _readlist, _sendlist, math_min(_selecttimeout, next_timer_time) )
849 for i, socket in ipairs( write ) do -- send data waiting in writequeues
850 local handler = _socketlist[ socket ]
852 handler.sendbuffer( )
854 closesocket( socket )
855 out_put "server.lua: found no handler and closed socket (writelist)" -- this should not happen
858 for i, socket in ipairs( read ) do -- receive data
859 local handler = _socketlist[ socket ]
861 handler.readbuffer( )
863 closesocket( socket )
864 out_put "server.lua: found no handler and closed socket (readlist)" -- this can happen
867 for handler, err in pairs( _closelist ) do
868 handler.disconnect( )( handler, err )
869 handler:force_close() -- forced disconnect
870 _closelist[ handler ] = nil;
872 _currenttime = luasocket_gettime( )
874 -- Check for socket timeouts
875 local difftime = os_difftime( _currenttime - _starttime )
876 if difftime > _checkinterval then
877 _starttime = _currenttime
878 for handler, timestamp in pairs( _writetimes ) do
879 if os_difftime( _currenttime - timestamp ) > _sendtimeout then
880 handler.disconnect( )( handler, "send timeout" )
881 handler:force_close() -- forced disconnect
884 for handler, timestamp in pairs( _readtimes ) do
885 if os_difftime( _currenttime - timestamp ) > _readtimeout then
886 if not(handler.onreadtimeout) or handler:onreadtimeout() ~= true then
887 handler.disconnect( )( handler, "read timeout" )
888 handler:close( ) -- forced disconnect?
890 _readtimes[ handler ] = _currenttime -- reset timer
897 if _currenttime - _timer >= math_min(next_timer_time, 1) then
898 next_timer_time = math_huge;
899 for i = 1, _timerlistlen do
900 local t = _timerlist[ i ]( _currenttime ) -- fire timers
901 if t then next_timer_time = math_min(next_timer_time, t); end
903 _timer = _currenttime
905 next_timer_time = next_timer_time - (_currenttime - _timer);
908 -- wait some time (0 by default)
909 socket_sleep( _sleeptime )
911 if once and quitting == "once" then quitting = nil; return; end
915 local function step()
919 local function get_backend()
923 --// EXPERIMENTAL //--
925 local wrapclient = function( socket, ip, serverport, listeners, pattern, sslctx )
926 local handler, socket, err = wrapconnection( nil, listeners, socket, ip, serverport, "clientport", pattern, sslctx )
927 if not handler then return nil, err end
928 _socketlist[ socket ] = handler
930 _sendlistlen = addsocket(_sendlist, socket, _sendlistlen)
931 if listeners.onconnect then
932 -- When socket is writeable, call onconnect
933 local _sendbuffer = handler.sendbuffer;
934 handler.sendbuffer = function ()
935 handler.sendbuffer = _sendbuffer;
936 listeners.onconnect(handler);
937 return _sendbuffer(); -- Send any queued outgoing data
941 return handler, socket
944 local addclient = function( address, port, listeners, pattern, sslctx )
945 local client, err = luasocket.tcp( )
949 client:settimeout( 0 )
950 _, err = client:connect( address, port )
951 if err then -- try again
952 return wrapclient( client, address, port, listeners, pattern, sslctx )
954 return wrapconnection( nil, listeners, client, address, port, "clientport", pattern, sslctx )
958 --// EXPERIMENTAL //--
960 ----------------------------------// BEGIN //--
962 use "setmetatable" ( _socketlist, { __mode = "k" } )
963 use "setmetatable" ( _readtimes, { __mode = "k" } )
964 use "setmetatable" ( _writetimes, { __mode = "k" } )
966 _timer = luasocket_gettime( )
967 _starttime = luasocket_gettime( )
969 local function setlogger(new_logger)
970 local old_logger = log;
977 ----------------------------------// PUBLIC INTERFACE //--
980 _addtimer = addtimer,
982 addclient = addclient,
983 wrapclient = wrapclient,
990 addserver = addserver,
991 getserver = getserver,
992 setlogger = setlogger,
993 getsettings = getsettings,
994 setquitting = setquitting,
995 removeserver = removeserver,
996 get_backend = get_backend,
997 changesettings = changesettings,