4 server.lua based on lua/libevent by blastbeat
7 -- when using luaevent, never register 2 or more EV_READ at one socket, same for EV_WRITE
8 -- you cant even register a new EV_READ/EV_WRITE callback inside another one
9 -- to do some of the above, use timeout events or something what will called from outside
10 -- dont let garbagecollect eventcallbacks, as long they are running
11 -- when using luasec, there are 4 cases of timeout errors: wantread or wantwrite during reading or writing
15 local SCRIPT_NAME = "server_event.lua"
16 local SCRIPT_VERSION = "0.05"
17 local SCRIPT_AUTHOR = "blastbeat"
18 local LAST_MODIFIED = "2009/11/20"
21 MAX_CONNECTIONS = 100000, -- max per server connections (use "ulimit -n" on *nix)
22 MAX_HANDSHAKE_ATTEMPTS= 1000, -- attempts to finish ssl handshake
23 HANDSHAKE_TIMEOUT = 60, -- timeout in seconds per handshake attempt
24 MAX_READ_LENGTH = 1024 * 1024 * 1024 * 1024, -- max bytes allowed to read from sockets
25 MAX_SEND_LENGTH = 1024 * 1024 * 1024 * 1024, -- max bytes size of write buffer (for writing on sockets)
26 ACCEPT_QUEUE = 128, -- might influence the length of the pending sockets queue
27 ACCEPT_DELAY = 10, -- seconds to wait until the next attempt of a full server to accept
28 READ_TIMEOUT = 60 * 60 * 6, -- timeout in seconds for read data from socket
29 WRITE_TIMEOUT = 180, -- timeout in seconds for write data on socket
30 CONNECT_TIMEOUT = 20, -- timeout in seconds for connection attempts
31 CLEAR_DELAY = 5, -- seconds to wait for clearing interface list (and calling ondisconnect listeners)
32 DEBUG = true, -- show debug messages
35 local function use(x) return rawget(_G, x); end
36 local ipairs = use "ipairs"
37 local string = use "string"
38 local select = use "select"
39 local require = use "require"
40 local tostring = use "tostring"
41 local coroutine = use "coroutine"
42 local setmetatable = use "setmetatable"
44 local t_insert = table.insert
45 local t_concat = table.concat
48 local socket = use "socket" or require "socket"
50 local log = require ("util.logger").init("socket")
52 local function debug(...)
53 return log("debug", ("%s "):rep(select('#', ...)), ...)
57 local bitor = ( function( ) -- thx Rici Lake
58 local hasbit = function( x, p )
59 return x % ( p + p ) >= p
61 return function( x, y )
64 local limit = x > y and x or y
66 if hasbit( x, p ) or hasbit( y, p ) then
75 local event = require "luaevent.core"
76 local base = event.new( )
77 local EV_READ = event.EV_READ
78 local EV_WRITE = event.EV_WRITE
79 local EV_TIMEOUT = event.EV_TIMEOUT
80 local EV_SIGNAL = event.EV_SIGNAL
82 local EV_READWRITE = bitor( EV_READ, EV_WRITE )
84 local interfacelist = ( function( ) -- holds the interfaces for sockets
87 return function( method, arg )
88 if "add" == method then
93 elseif "delete" == method then
95 return nil, "array is already empty"
97 local position = arg:_position() -- get position in array
98 if position ~= len then
99 local interface = array[ len ] -- get last interface
100 array[ position ] = interface -- copy it into free position
101 array[ len ] = nil -- free last position
102 interface:_position( position ) -- set new position in array
103 else -- free last position
114 -- Client interface methods
117 interface_mt = {}; interface_mt.__index = interface_mt;
119 local addevent = base.addevent
120 local coroutine_wrap, coroutine_yield = coroutine.wrap,coroutine.yield
123 function interface_mt:_position(new_position)
124 self.position = new_position or self.position
125 return self.position;
127 function interface_mt:_close()
128 return self:_destroy();
131 function interface_mt:_start_connection(plainssl) -- should be called from addclient
132 local callback = function( event )
133 if EV_TIMEOUT == event then -- timeout during connection
134 self.fatalerror = "connection timeout"
135 self:ontimeout() -- call timeout listener
137 debug( "new connection failed. id:", self.id, "error:", self.fatalerror )
139 if plainssl and ssl then -- start ssl session
140 self:starttls(self._sslctx, true)
141 else -- normal connection
142 self:_start_session(true)
144 debug( "new connection established. id:", self.id )
146 self.eventconnect = nil
149 self.eventconnect = addevent( base, self.conn, EV_WRITE, callback, cfg.CONNECT_TIMEOUT )
152 function interface_mt:_start_session(call_onconnect) -- new session, for example after startssl
153 if self.type == "client" then
154 local callback = function( )
155 self:_lock( false, false, false )
156 --vdebug( "start listening on client socket with id:", self.id )
157 self.eventread = addevent( base, self.conn, EV_READ, self.readcallback, cfg.READ_TIMEOUT ); -- register callback
158 if call_onconnect then
161 self.eventsession = nil
164 self.eventsession = addevent( base, nil, EV_TIMEOUT, callback, 0 )
167 --vdebug( "start listening on server socket with id:", self.id )
168 self.eventread = addevent( base, self.conn, EV_READ, self.readcallback ) -- register callback
172 function interface_mt:_start_ssl(call_onconnect) -- old socket will be destroyed, therefore we have to close read/write events first
173 --vdebug( "starting ssl session with client id:", self.id )
175 _ = self.eventread and self.eventread:close( ) -- close events; this must be called outside of the event callbacks!
176 _ = self.eventwrite and self.eventwrite:close( )
177 self.eventread, self.eventwrite = nil, nil
179 self.conn, err = ssl.wrap( self.conn, self._sslctx )
181 self.fatalerror = err
182 self.conn = nil -- cannot be used anymore
183 if call_onconnect then
184 self.ondisconnect = nil -- dont call this when client isnt really connected
187 debug( "fatal error while ssl wrapping:", err )
190 self.conn:settimeout( 0 ) -- set non blocking
191 local handshakecallback = coroutine_wrap(
195 local maxattempt = cfg.MAX_HANDSHAKE_ATTEMPTS
196 while attempt < maxattempt do -- no endless loop
197 attempt = attempt + 1
198 debug( "ssl handshake of client with id:"..tostring(self)..", attempt:"..attempt )
199 if attempt > maxattempt then
200 self.fatalerror = "max handshake attempts exceeded"
201 elseif EV_TIMEOUT == event then
202 self.fatalerror = "timeout during handshake"
204 _, err = self.conn:dohandshake( )
206 self:_lock( false, false, false ) -- unlock the interface; sending, closing etc allowed
207 self.send = self.conn.send -- caching table lookups with new client object
208 self.receive = self.conn.receive
209 if not call_onconnect then -- trigger listener
210 self:onstatus("ssl-handshake-complete");
212 self:_start_session( call_onconnect )
213 debug( "ssl handshake done" )
214 self.eventhandshake = nil
217 if err == "wantwrite" then
219 elseif err == "wantread" then
222 debug( "ssl handshake error:", err )
223 self.fatalerror = err
226 if self.fatalerror then
227 if call_onconnect then
228 self.ondisconnect = nil -- dont call this when client isnt really connected
231 debug( "handshake failed because:", self.fatalerror )
232 self.eventhandshake = nil
235 event = coroutine_yield( event, cfg.HANDSHAKE_TIMEOUT ) -- yield this monster...
239 debug "starting handshake..."
240 self:_lock( false, true, true ) -- unlock read/write events, but keep interface locked
241 self.eventhandshake = addevent( base, self.conn, EV_READWRITE, handshakecallback, cfg.HANDSHAKE_TIMEOUT )
244 function interface_mt:_destroy() -- close this interface + events and call last listener
245 debug( "closing client with id:", self.id, self.fatalerror )
246 self:_lock( true, true, true ) -- first of all, lock the interface to avoid further actions
248 _ = self.eventread and self.eventread:close( )
249 if self.type == "client" then
250 _ = self.eventwrite and self.eventwrite:close( )
251 _ = self.eventhandshake and self.eventhandshake:close( )
252 _ = self.eventstarthandshake and self.eventstarthandshake:close( )
253 _ = self.eventconnect and self.eventconnect:close( )
254 _ = self.eventsession and self.eventsession:close( )
255 _ = self.eventwritetimeout and self.eventwritetimeout:close( )
256 _ = self.eventreadtimeout and self.eventreadtimeout:close( )
257 _ = 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)
258 _ = self.conn and self.conn:close( ) -- close connection
259 _ = self._server and self._server:counter(-1);
260 self.eventread, self.eventwrite = nil, nil
261 self.eventstarthandshake, self.eventhandshake, self.eventclose = nil, nil, nil
262 self.readcallback, self.writecallback = nil, nil
265 self.eventread, self.eventclose = nil, nil
266 self.interface, self.readcallback = nil, nil
268 interfacelist( "delete", self )
272 function interface_mt:_lock(nointerface, noreading, nowriting) -- lock or unlock this interface or events
273 self.nointerface, self.noreading, self.nowriting = nointerface, noreading, nowriting
274 return nointerface, noreading, nowriting
278 function interface_mt:lock_read(switch)
282 return self:resume();
286 function interface_mt:pause()
287 return self:_lock(self.nointerface, true, self.nowriting);
290 function interface_mt:resume()
291 self:_lock(self.nointerface, false, self.nowriting);
292 if not self.eventread then
293 self.eventread = addevent( base, self.conn, EV_READ, self.readcallback, cfg.READ_TIMEOUT ); -- register callback
297 function interface_mt:counter(c)
299 self._connections = self._connections + c
301 return self._connections
305 function interface_mt:write(data)
306 if self.nowriting then return nil, "locked" end
307 --vdebug( "try to send data to client, id/data:", self.id, data )
308 data = tostring( data )
310 local total = len + self.writebufferlen
311 if total > cfg.MAX_SEND_LENGTH then -- check buffer length
312 local err = "send buffer exceeded"
313 debug( "error:", err ) -- to much, check your app
316 t_insert(self.writebuffer, data) -- new buffer
317 self.writebufferlen = total
318 if not self.eventwrite then -- register new write event
319 --vdebug( "register new write event" )
320 self.eventwrite = addevent( base, self.conn, EV_WRITE, self.writecallback, cfg.WRITE_TIMEOUT )
324 function interface_mt:close()
325 if self.nointerface then return nil, "locked"; end
326 debug( "try to close client connection with id:", self.id )
327 if self.type == "client" then
328 self.fatalerror = "client to close"
329 if self.eventwrite then -- wait for incomplete write request
330 self:_lock( true, true, false )
331 debug "closing delayed until writebuffer is empty"
332 return nil, "writebuffer not empty, waiting"
334 self:_lock( true, true, true )
339 debug( "try to close server with id:", tostring(self.id))
340 self.fatalerror = "server to close"
347 function interface_mt:socket()
351 function interface_mt:server()
352 return self._server or self;
355 function interface_mt:port()
359 function interface_mt:serverport()
360 return self._serverport
363 function interface_mt:ip()
367 function interface_mt:ssl()
368 return self._usingssl
370 interface_mt.clientport = interface_mt.port -- COMPAT server_select
372 function interface_mt:type()
373 return self._type or "client"
376 function interface_mt:connections()
377 return self._connections
380 function interface_mt:address()
384 function interface_mt:set_sslctx(sslctx)
385 self._sslctx = sslctx;
387 self.starttls = nil; -- use starttls() of interface_mt
389 self.starttls = false; -- prevent starttls()
393 function interface_mt:set_mode(pattern)
395 self._pattern = pattern;
397 return self._pattern;
400 function interface_mt:set_send(new_send)
401 -- No-op, we always use the underlying connection's send
404 function interface_mt:starttls(sslctx, call_onconnect)
405 debug( "try to start ssl at client id:", self.id )
407 self._sslctx = sslctx;
408 if self._usingssl then -- startssl was already called
409 err = "ssl already active"
412 debug( "error:", err )
415 self._usingssl = true
416 self.startsslcallback = function( ) -- we have to start the handshake outside of a read/write event
417 self.startsslcallback = nil
418 self:_start_ssl(call_onconnect);
419 self.eventstarthandshake = nil
422 if not self.eventwrite then
423 self:_lock( true, true, true ) -- lock the interface, to not disturb the handshake
424 self.eventstarthandshake = addevent( base, nil, EV_TIMEOUT, self.startsslcallback, 0 ) -- add event to start handshake
425 else -- wait until writebuffer is empty
426 self:_lock( true, true, false )
427 debug "ssl session delayed until writebuffer is empty..."
429 self.starttls = false;
433 function interface_mt:setoption(option, value)
434 if self.conn.setoption then
435 return self.conn:setoption(option, value);
437 return false, "setoption not implemented";
440 function interface_mt:setlistener(listener)
441 self.onconnect, self.ondisconnect, self.onincoming, self.ontimeout, self.onstatus
442 = listener.onconnect, listener.ondisconnect, listener.onincoming, listener.ontimeout, listener.onstatus;
446 function interface_mt:onconnect()
448 function interface_mt:onincoming()
450 function interface_mt:ondisconnect()
452 function interface_mt:ontimeout()
454 function interface_mt:ondrain()
456 function interface_mt:onstatus()
460 -- End of client interface methods
464 local string_sub = string.sub -- caching table lookups
465 local addevent = base.addevent
466 local socket_gettime = socket.gettime
467 function handleclient( client, ip, port, server, pattern, listener, sslctx ) -- creates an client interface
468 --vdebug("creating client interfacce...")
472 currenttime = socket_gettime( ); -- safe the origin
473 writebuffer = {}; -- writebuffer
474 writebufferlen = 0; -- length of writebuffer
475 send = client.send; -- caching table lookups
476 receive = client.receive;
477 onconnect = listener.onconnect; -- will be called when client disconnects
478 ondisconnect = listener.ondisconnect; -- will be called when client disconnects
479 onincoming = listener.onincoming; -- will be called when client sends data
480 ontimeout = listener.ontimeout; -- called when fatal socket timeout occurs
481 ondrain = listener.ondrain; -- called when writebuffer is empty
482 onstatus = listener.onstatus; -- called for status changes (e.g. of SSL/TLS)
483 eventread = false, eventwrite = false, eventclose = false,
484 eventhandshake = false, eventstarthandshake = false; -- event handler
485 eventconnect = false, eventsession = false; -- more event handler...
486 eventwritetimeout = false; -- even more event handler...
487 eventreadtimeout = false;
488 fatalerror = false; -- error message
489 writecallback = false; -- will be called on write events
490 readcallback = false; -- will be called on read events
491 nointerface = true; -- lock/unlock parameter of this interface
492 noreading = false, nowriting = false; -- locks of the read/writecallback
493 startsslcallback = false; -- starting handshake callback
494 position = false; -- position of client in interfacelist
497 _ip = ip, _port = port, _server = server, _pattern = pattern,
498 _serverport = (server and server:port() or nil),
499 _sslctx = sslctx; -- parameters
500 _usingssl = false; -- client is using ssl;
502 if not ssl then interface.starttls = false; end
503 interface.id = tostring(interface):match("%x+$");
504 interface.writecallback = function( event ) -- called on write events
505 --vdebug( "new client write event, id/ip/port:", interface, ip, port )
506 if interface.nowriting or ( interface.fatalerror and ( "client to close" ~= interface.fatalerror ) ) then -- leave this event
507 --vdebug( "leaving this event because:", interface.nowriting or interface.fatalerror )
508 interface.eventwrite = false
511 if EV_TIMEOUT == event then -- took too long to write some data to socket -> disconnect
512 interface.fatalerror = "timeout during writing"
513 debug( "writing failed:", interface.fatalerror )
515 interface.eventwrite = false
518 if interface._usingssl then -- handle luasec
519 if interface.eventreadtimeout then -- we have to read first
520 local ret = interface.readcallback( ) -- call readcallback
521 --vdebug( "tried to read in writecallback, result:", ret )
523 if interface.eventwritetimeout then -- luasec only
524 interface.eventwritetimeout:close( ) -- first we have to close timeout event which where regged after a wantread error
525 interface.eventwritetimeout = false
528 interface.writebuffer = { t_concat(interface.writebuffer) }
529 local succ, err, byte = interface.conn:send( interface.writebuffer[1], 1, interface.writebufferlen )
530 --vdebug( "write data:", interface.writebuffer, "error:", err, "part:", byte )
531 if succ then -- writing succesful
532 interface.writebuffer[1] = nil
533 interface.writebufferlen = 0
535 if interface.fatalerror then
536 debug "closing client after writing"
537 interface:_close() -- close interface if needed
538 elseif interface.startsslcallback then -- start ssl connection if needed
539 debug "starting ssl handshake after writing"
540 interface.eventstarthandshake = addevent( base, nil, EV_TIMEOUT, interface.startsslcallback, 0 )
541 elseif interface.eventreadtimeout then
542 return EV_WRITE, EV_TIMEOUT
544 interface.eventwrite = nil
546 elseif byte and (err == "timeout" or err == "wantwrite") then -- want write again
547 --vdebug( "writebuffer is not empty:", err )
548 interface.writebuffer[1] = string_sub( interface.writebuffer[1], byte + 1, interface.writebufferlen ) -- new buffer
549 interface.writebufferlen = interface.writebufferlen - byte
550 if "wantread" == err then -- happens only with luasec
551 local callback = function( )
553 interface.eventwritetimeout = nil
556 interface.eventwritetimeout = addevent( base, nil, EV_TIMEOUT, callback, cfg.WRITE_TIMEOUT ) -- reg a new timeout event
557 debug( "wantread during write attempt, reg it in readcallback but dont know what really happens next..." )
558 -- hopefully this works with luasec; its simply not possible to use 2 different write events on a socket in luaevent
561 return EV_WRITE, cfg.WRITE_TIMEOUT
562 else -- connection was closed during writing or fatal error
563 interface.fatalerror = err or "fatal error"
564 debug( "connection failed in write event:", interface.fatalerror )
566 interface.eventwrite = nil
572 interface.readcallback = function( event ) -- called on read events
573 --vdebug( "new client read event, id/ip/port:", tostring(interface.id), tostring(ip), tostring(port) )
574 if interface.noreading or interface.fatalerror then -- leave this event
575 --vdebug( "leaving this event because:", tostring(interface.noreading or interface.fatalerror) )
576 interface.eventread = nil
579 if EV_TIMEOUT == event then -- took too long to get some data from client -> disconnect
580 interface.fatalerror = "timeout during receiving"
581 debug( "connection failed:", interface.fatalerror )
583 interface.eventread = nil
586 if interface._usingssl then -- handle luasec
587 if interface.eventwritetimeout then -- ok, in the past writecallback was regged
588 local ret = interface.writecallback( ) -- call it
589 --vdebug( "tried to write in readcallback, result:", tostring(ret) )
591 if interface.eventreadtimeout then
592 interface.eventreadtimeout:close( )
593 interface.eventreadtimeout = nil
596 local buffer, err, part = interface.conn:receive( interface._pattern ) -- receive buffer with "pattern"
597 --vdebug( "read data:", tostring(buffer), "error:", tostring(err), "part:", tostring(part) )
598 buffer = buffer or part
599 if buffer and #buffer > cfg.MAX_READ_LENGTH then -- check buffer length
600 interface.fatalerror = "receive buffer exceeded"
601 debug( "fatal error:", interface.fatalerror )
603 interface.eventread = nil
606 if err and ( err ~= "timeout" and err ~= "wantread" ) then
607 if "wantwrite" == err then -- need to read on write event
608 if not interface.eventwrite then -- register new write event if needed
609 interface.eventwrite = addevent( base, interface.conn, EV_WRITE, interface.writecallback, cfg.WRITE_TIMEOUT )
611 interface.eventreadtimeout = addevent( base, nil, EV_TIMEOUT,
614 end, cfg.READ_TIMEOUT
616 debug( "wantwrite during read attempt, reg it in writecallback but dont know what really happens next..." )
617 -- to be honest i dont know what happens next, if it is allowed to first read, the write etc...
618 else -- connection was closed or fatal error
619 interface.fatalerror = err
620 debug( "connection failed in read event:", interface.fatalerror )
622 interface.eventread = nil
626 interface.onincoming( interface, buffer, err ) -- send new data to listener
628 if interface.noreading then
629 interface.eventread = nil;
632 return EV_READ, cfg.READ_TIMEOUT
636 client:settimeout( 0 ) -- set non blocking
637 setmetatable(interface, interface_mt)
638 interfacelist( "add", interface ) -- add to interfacelist
645 function handleserver( server, addr, port, pattern, listener, sslctx ) -- creates an server interface
646 debug "creating server interface..."
651 onconnect = listener.onconnect; -- will be called when new client connected
652 eventread = false; -- read event handler
653 eventclose = false; -- close event handler
654 readcallback = false; -- read event callback
655 fatalerror = false; -- error message
656 nointerface = true; -- lock/unlock parameter
658 _ip = addr, _port = port, _pattern = pattern,
661 interface.id = tostring(interface):match("%x+$");
662 interface.readcallback = function( event ) -- server handler, called on incoming connections
663 --vdebug( "server can accept, id/addr/port:", interface, addr, port )
664 if interface.fatalerror then
665 --vdebug( "leaving this event because:", self.fatalerror )
666 interface.eventread = nil
669 local delay = cfg.ACCEPT_DELAY
670 if EV_TIMEOUT == event then
671 if interface._connections >= cfg.MAX_CONNECTIONS then -- check connection count
672 debug( "to many connections, seconds to wait for next accept:", delay )
673 return EV_TIMEOUT, delay -- timeout...
675 return EV_READ -- accept again
678 --vdebug("max connection check ok, accepting...")
679 local client, err = server:accept() -- try to accept; TODO: check err
681 if interface._connections >= cfg.MAX_CONNECTIONS then
682 client:close( ) -- refuse connection
683 debug( "maximal connections reached, refuse client connection; accept delay:", delay )
684 return EV_TIMEOUT, delay -- delay for next accept attempt
686 local client_ip, client_port = client:getpeername( )
687 interface._connections = interface._connections + 1 -- increase connection count
688 local clientinterface = handleclient( client, client_ip, client_port, interface, pattern, listener, sslctx )
689 --vdebug( "client id:", clientinterface, "startssl:", startssl )
690 if ssl and sslctx then
691 clientinterface:starttls(sslctx, true)
693 clientinterface:_start_session( true )
695 debug( "accepted incoming client connection from:", client_ip or "<unknown IP>", client_port or "<unknown port>", "to", port or "<unknown port>");
697 client, err = server:accept() -- try to accept again
702 server:settimeout( 0 )
703 setmetatable(interface, interface_mt)
704 interfacelist( "add", interface )
705 interface:_start_session()
710 local addserver = ( function( )
711 return function( addr, port, listener, pattern, sslcfg, startssl ) -- TODO: check arguments
712 --vdebug( "creating new tcp server with following parameters:", addr or "nil", port or "nil", sslcfg or "nil", startssl or "nil")
713 local server, err = socket.bind( addr, port, cfg.ACCEPT_QUEUE ) -- create server socket
715 debug( "creating server socket on "..addr.." port "..port.." failed:", err )
721 debug "fatal error: luasec not found"
722 return nil, "luasec not found"
726 debug( "error while creating new ssl context for server socket:", err )
730 local interface = handleserver( server, addr, port, pattern, listener, sslctx, startssl ) -- new server handler
731 debug( "new server created with id:", tostring(interface))
736 local addclient, wrapclient
738 function wrapclient( client, ip, port, listeners, pattern, sslctx )
739 local interface = handleclient( client, ip, port, nil, pattern, listeners, sslctx )
740 interface:_start_connection(sslctx)
741 return interface, client
742 --function handleclient( client, ip, port, server, pattern, listener, _, sslctx ) -- creates an client interface
745 function addclient( addr, serverport, listener, pattern, localaddr, localport, sslcfg, startssl )
746 local client, err = socket.tcp() -- creating new socket
748 debug( "cannot create socket:", err )
751 client:settimeout( 0 ) -- set nonblocking
753 local res, err = client:bind( localaddr, localport, -1 )
755 debug( "cannot bind client:", err )
760 if sslcfg then -- handle ssl/new context
762 debug "need luasec, but not available"
763 return nil, "luasec not found"
767 debug( "cannot create new ssl context:", err )
771 local res, err = client:connect( addr, serverport ) -- connect
772 if res or ( err == "timeout" ) then
773 local ip, port = client:getsockname( )
774 local interface = wrapclient( client, ip, serverport, listener, pattern, sslctx, startssl )
775 interface:_start_connection( startssl )
776 debug( "new connection id:", interface.id )
777 return interface, err
779 debug( "new connection failed:", err )
786 local loop = function( ) -- starts the event loop
791 local newevent = ( function( )
792 local add = base.addevent
793 return function( ... )
794 return add( base, ... )
798 local closeallservers = function( arg )
799 for _, item in ipairs( interfacelist( ) ) do
800 if item.type == "server" then
806 local function setquitting(yes)
814 local function get_backend()
815 return base:method();
818 -- We need to hold onto the events to stop them
819 -- being garbage-collected
820 local signal_events = {}; -- [signal_num] -> event object
821 local function hook_signal(signal_num, handler)
822 local function _handler(event)
823 local ret = handler();
824 if ret ~= false then -- Continue handling this signal?
825 return EV_SIGNAL; -- Yes
827 return -1; -- Close this event
829 signal_events[signal_num] = base:addevent(signal_num, EV_SIGNAL, _handler);
830 return signal_events[signal_num];
833 local function link(sender, receiver, buffersize)
836 function receiver:ondrain()
837 if sender_locked then
843 function sender:onincoming(data)
844 receiver:write(data);
845 if receiver.writebufferlen >= buffersize then
846 sender_locked = true;
850 sender:set_mode("*a");
862 addserver = addserver,
863 addclient = addclient,
864 wrapclient = wrapclient,
865 setquitting = setquitting,
866 closeall = closeallservers,
867 get_backend = get_backend,
868 hook_signal = hook_signal,
870 __NAME = SCRIPT_NAME,
871 __DATE = LAST_MODIFIED,
872 __AUTHOR = SCRIPT_AUTHOR,
873 __VERSION = SCRIPT_VERSION,