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
14 -- luacheck: ignore 212/self 431/err 211/ret
16 local SCRIPT_NAME = "server_event.lua"
17 local SCRIPT_VERSION = "0.05"
18 local SCRIPT_AUTHOR = "blastbeat"
19 local LAST_MODIFIED = "2009/11/20"
22 MAX_CONNECTIONS = 100000, -- max per server connections (use "ulimit -n" on *nix)
23 MAX_HANDSHAKE_ATTEMPTS= 1000, -- attempts to finish ssl handshake
24 HANDSHAKE_TIMEOUT = 60, -- timeout in seconds per handshake attempt
25 MAX_READ_LENGTH = 1024 * 1024 * 1024 * 1024, -- max bytes allowed to read from sockets
26 MAX_SEND_LENGTH = 1024 * 1024 * 1024 * 1024, -- max bytes size of write buffer (for writing on sockets)
27 ACCEPT_QUEUE = 128, -- might influence the length of the pending sockets queue
28 ACCEPT_DELAY = 10, -- seconds to wait until the next attempt of a full server to accept
29 READ_TIMEOUT = 60 * 60 * 6, -- timeout in seconds for read data from socket
30 WRITE_TIMEOUT = 180, -- timeout in seconds for write data on socket
31 CONNECT_TIMEOUT = 20, -- timeout in seconds for connection attempts
32 CLEAR_DELAY = 5, -- seconds to wait for clearing interface list (and calling ondisconnect listeners)
33 DEBUG = true, -- show debug messages
38 local require = require
39 local tostring = tostring
40 local setmetatable = setmetatable
42 local t_insert = table.insert
43 local t_concat = table.concat
44 local s_sub = string.sub
46 local coroutine_wrap = coroutine.wrap
47 local coroutine_yield = coroutine.yield
49 local has_luasec, ssl = pcall ( require , "ssl" )
50 local socket = require "socket"
51 local levent = require "luaevent.core"
53 local socket_gettime = socket.gettime
54 local getaddrinfo = socket.dns.getaddrinfo
56 local log = require ("util.logger").init("socket")
58 local function debug(...)
59 return log("debug", ("%s "):rep(select('#', ...)), ...)
61 -- local vdebug = debug;
63 local bitor = ( function( ) -- thx Rici Lake
64 local hasbit = function( x, p )
65 return x % ( p + p ) >= p
67 return function( x, y )
70 local limit = x > y and x or y
72 if hasbit( x, p ) or hasbit( y, p ) then
81 local base = levent.new( )
82 local addevent = base.addevent
83 local EV_READ = levent.EV_READ
84 local EV_WRITE = levent.EV_WRITE
85 local EV_TIMEOUT = levent.EV_TIMEOUT
86 local EV_SIGNAL = levent.EV_SIGNAL
88 local EV_READWRITE = bitor( EV_READ, EV_WRITE )
90 local interfacelist = { }
92 -- Client interface methods
93 local interface_mt = {}; interface_mt.__index = interface_mt;
96 function interface_mt:_close()
97 return self:_destroy();
100 function interface_mt:_start_connection(plainssl) -- should be called from addclient
101 local callback = function( event )
102 if EV_TIMEOUT == event then -- timeout during connection
103 self.fatalerror = "connection timeout"
104 self:ontimeout() -- call timeout listener
106 debug( "new connection failed. id:", self.id, "error:", self.fatalerror )
108 if plainssl and has_luasec then -- start ssl session
109 self:starttls(self._sslctx, true)
110 else -- normal connection
111 self:_start_session(true)
113 debug( "new connection established. id:", self.id )
115 self.eventconnect = nil
118 self.eventconnect = addevent( base, self.conn, EV_WRITE, callback, cfg.CONNECT_TIMEOUT )
121 function interface_mt:_start_session(call_onconnect) -- new session, for example after startssl
122 if self.type == "client" then
123 local callback = function( )
124 self:_lock( false, false, false )
125 --vdebug( "start listening on client socket with id:", self.id )
126 self.eventread = addevent( base, self.conn, EV_READ, self.readcallback, cfg.READ_TIMEOUT ); -- register callback
127 if call_onconnect then
130 self.eventsession = nil
133 self.eventsession = addevent( base, nil, EV_TIMEOUT, callback, 0 )
136 --vdebug( "start listening on server socket with id:", self.id )
137 self.eventread = addevent( base, self.conn, EV_READ, self.readcallback ) -- register callback
141 function interface_mt:_start_ssl(call_onconnect) -- old socket will be destroyed, therefore we have to close read/write events first
142 --vdebug( "starting ssl session with client id:", self.id )
144 _ = self.eventread and self.eventread:close( ) -- close events; this must be called outside of the event callbacks!
145 _ = self.eventwrite and self.eventwrite:close( )
146 self.eventread, self.eventwrite = nil, nil
148 self.conn, err = ssl.wrap( self.conn, self._sslctx )
150 self.fatalerror = err
151 self.conn = nil -- cannot be used anymore
152 if call_onconnect then
153 self.ondisconnect = nil -- dont call this when client isnt really connected
156 debug( "fatal error while ssl wrapping:", err )
159 self.conn:settimeout( 0 ) -- set non blocking
160 local handshakecallback = coroutine_wrap(function( event )
163 local maxattempt = cfg.MAX_HANDSHAKE_ATTEMPTS
164 while attempt < maxattempt do -- no endless loop
165 attempt = attempt + 1
166 debug( "ssl handshake of client with id:"..tostring(self)..", attempt:"..attempt )
167 if attempt > maxattempt then
168 self.fatalerror = "max handshake attempts exceeded"
169 elseif EV_TIMEOUT == event then
170 self.fatalerror = "timeout during handshake"
172 _, err = self.conn:dohandshake( )
174 self:_lock( false, false, false ) -- unlock the interface; sending, closing etc allowed
175 self.send = self.conn.send -- caching table lookups with new client object
176 self.receive = self.conn.receive
177 if not call_onconnect then -- trigger listener
178 self:onstatus("ssl-handshake-complete");
180 self:_start_session( call_onconnect )
181 debug( "ssl handshake done" )
182 self.eventhandshake = nil
185 if err == "wantwrite" then
187 elseif err == "wantread" then
190 debug( "ssl handshake error:", err )
191 self.fatalerror = err
194 if self.fatalerror then
195 if call_onconnect then
196 self.ondisconnect = nil -- dont call this when client isnt really connected
199 debug( "handshake failed because:", self.fatalerror )
200 self.eventhandshake = nil
203 event = coroutine_yield( event, cfg.HANDSHAKE_TIMEOUT ) -- yield this monster...
207 debug "starting handshake..."
208 self:_lock( false, true, true ) -- unlock read/write events, but keep interface locked
209 self.eventhandshake = addevent( base, self.conn, EV_READWRITE, handshakecallback, cfg.HANDSHAKE_TIMEOUT )
212 function interface_mt:_destroy() -- close this interface + events and call last listener
213 debug( "closing client with id:", self.id, self.fatalerror )
214 self:_lock( true, true, true ) -- first of all, lock the interface to avoid further actions
216 _ = self.eventread and self.eventread:close( )
217 if self.type == "client" then
218 _ = self.eventwrite and self.eventwrite:close( )
219 _ = self.eventhandshake and self.eventhandshake:close( )
220 _ = self.eventstarthandshake and self.eventstarthandshake:close( )
221 _ = self.eventconnect and self.eventconnect:close( )
222 _ = self.eventsession and self.eventsession:close( )
223 _ = self.eventwritetimeout and self.eventwritetimeout:close( )
224 _ = self.eventreadtimeout and self.eventreadtimeout:close( )
225 _ = 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)
226 _ = self.conn and self.conn:close( ) -- close connection
227 _ = self._server and self._server:counter(-1);
228 self.eventread, self.eventwrite = nil, nil
229 self.eventstarthandshake, self.eventhandshake, self.eventclose = nil, nil, nil
230 self.readcallback, self.writecallback = nil, nil
233 self.eventread, self.eventclose = nil, nil
234 self.interface, self.readcallback = nil, nil
236 interfacelist[ self ] = nil
240 function interface_mt:_lock(nointerface, noreading, nowriting) -- lock or unlock this interface or events
241 self.nointerface, self.noreading, self.nowriting = nointerface, noreading, nowriting
242 return nointerface, noreading, nowriting
246 function interface_mt:lock_read(switch)
250 return self:resume();
254 function interface_mt:pause()
255 return self:_lock(self.nointerface, true, self.nowriting);
258 function interface_mt:resume()
259 self:_lock(self.nointerface, false, self.nowriting);
260 if self.readcallback and not self.eventread then
261 self.eventread = addevent( base, self.conn, EV_READ, self.readcallback, cfg.READ_TIMEOUT ); -- register callback
266 function interface_mt:counter(c)
268 self._connections = self._connections + c
270 return self._connections
274 function interface_mt:write(data)
275 if self.nowriting then return nil, "locked" end
276 --vdebug( "try to send data to client, id/data:", self.id, data )
277 data = tostring( data )
279 local total = len + self.writebufferlen
280 if total > cfg.MAX_SEND_LENGTH then -- check buffer length
281 local err = "send buffer exceeded"
282 debug( "error:", err ) -- to much, check your app
285 t_insert(self.writebuffer, data) -- new buffer
286 self.writebufferlen = total
287 if not self.eventwrite then -- register new write event
288 --vdebug( "register new write event" )
289 self.eventwrite = addevent( base, self.conn, EV_WRITE, self.writecallback, cfg.WRITE_TIMEOUT )
293 function interface_mt:close()
294 if self.nointerface then return nil, "locked"; end
295 debug( "try to close client connection with id:", self.id )
296 if self.type == "client" then
297 self.fatalerror = "client to close"
298 if self.eventwrite then -- wait for incomplete write request
299 self:_lock( true, true, false )
300 debug "closing delayed until writebuffer is empty"
301 return nil, "writebuffer not empty, waiting"
303 self:_lock( true, true, true )
308 debug( "try to close server with id:", tostring(self.id))
309 self.fatalerror = "server to close"
316 function interface_mt:socket()
320 function interface_mt:server()
321 return self._server or self;
324 function interface_mt:port()
328 function interface_mt:serverport()
329 return self._serverport
332 function interface_mt:ip()
336 function interface_mt:ssl()
337 return self._usingssl
339 interface_mt.clientport = interface_mt.port -- COMPAT server_select
341 function interface_mt:type()
342 return self._type or "client"
345 function interface_mt:connections()
346 return self._connections
349 function interface_mt:address()
353 function interface_mt:set_sslctx(sslctx)
354 self._sslctx = sslctx;
356 self.starttls = nil; -- use starttls() of interface_mt
358 self.starttls = false; -- prevent starttls()
362 function interface_mt:set_mode(pattern)
364 self._pattern = pattern;
366 return self._pattern;
369 function interface_mt:set_send(new_send) -- luacheck: ignore 212
370 -- No-op, we always use the underlying connection's send
373 function interface_mt:starttls(sslctx, call_onconnect)
374 debug( "try to start ssl at client id:", self.id )
376 self._sslctx = sslctx;
377 if self._usingssl then -- startssl was already called
378 err = "ssl already active"
381 debug( "error:", err )
384 self._usingssl = true
385 self.startsslcallback = function( ) -- we have to start the handshake outside of a read/write event
386 self.startsslcallback = nil
387 self:_start_ssl(call_onconnect);
388 self.eventstarthandshake = nil
391 if not self.eventwrite then
392 self:_lock( true, true, true ) -- lock the interface, to not disturb the handshake
393 self.eventstarthandshake = addevent( base, nil, EV_TIMEOUT, self.startsslcallback, 0 ) -- add event to start handshake
395 -- wait until writebuffer is empty
396 self:_lock( true, true, false )
397 debug "ssl session delayed until writebuffer is empty..."
399 self.starttls = false;
403 function interface_mt:setoption(option, value)
404 if self.conn.setoption then
405 return self.conn:setoption(option, value);
407 return false, "setoption not implemented";
410 function interface_mt:setlistener(listener)
411 self:ondetach(); -- Notify listener that it is no longer responsible for this connection
412 self.onconnect, self.ondisconnect, self.onincoming, self.ontimeout,
413 self.onreadtimeout, self.onstatus, self.ondetach
414 = listener.onconnect, listener.ondisconnect, listener.onincoming, listener.ontimeout,
415 listener.onreadtimeout, listener.onstatus, listener.ondetach;
419 function interface_mt:onconnect()
421 function interface_mt:onincoming()
423 function interface_mt:ondisconnect()
425 function interface_mt:ontimeout()
427 function interface_mt:onreadtimeout()
428 self.fatalerror = "timeout during receiving"
429 debug( "connection failed:", self.fatalerror )
433 function interface_mt:ondrain()
435 function interface_mt:ondetach()
437 function interface_mt:onstatus()
440 -- End of client interface methods
442 local function handleclient( client, ip, port, server, pattern, listener, sslctx ) -- creates an client interface
443 --vdebug("creating client interfacce...")
447 currenttime = socket_gettime( ); -- safe the origin
448 writebuffer = {}; -- writebuffer
449 writebufferlen = 0; -- length of writebuffer
450 send = client.send; -- caching table lookups
451 receive = client.receive;
452 onconnect = listener.onconnect; -- will be called when client disconnects
453 ondisconnect = listener.ondisconnect; -- will be called when client disconnects
454 onincoming = listener.onincoming; -- will be called when client sends data
455 ontimeout = listener.ontimeout; -- called when fatal socket timeout occurs
456 onreadtimeout = listener.onreadtimeout; -- called when socket inactivity timeout occurs
457 ondrain = listener.ondrain; -- called when writebuffer is empty
458 ondetach = listener.ondetach; -- called when disassociating this listener from this connection
459 onstatus = listener.onstatus; -- called for status changes (e.g. of SSL/TLS)
460 eventread = false, eventwrite = false, eventclose = false,
461 eventhandshake = false, eventstarthandshake = false; -- event handler
462 eventconnect = false, eventsession = false; -- more event handler...
463 eventwritetimeout = false; -- even more event handler...
464 eventreadtimeout = false;
465 fatalerror = false; -- error message
466 writecallback = false; -- will be called on write events
467 readcallback = false; -- will be called on read events
468 nointerface = true; -- lock/unlock parameter of this interface
469 noreading = false, nowriting = false; -- locks of the read/writecallback
470 startsslcallback = false; -- starting handshake callback
471 position = false; -- position of client in interfacelist
474 _ip = ip, _port = port, _server = server, _pattern = pattern,
475 _serverport = (server and server:port() or nil),
476 _sslctx = sslctx; -- parameters
477 _usingssl = false; -- client is using ssl;
479 if not has_luasec then interface.starttls = false; end
480 interface.id = tostring(interface):match("%x+$");
481 interface.writecallback = function( event ) -- called on write events
482 --vdebug( "new client write event, id/ip/port:", interface, ip, port )
483 if interface.nowriting or ( interface.fatalerror and ( "client to close" ~= interface.fatalerror ) ) then -- leave this event
484 --vdebug( "leaving this event because:", interface.nowriting or interface.fatalerror )
485 interface.eventwrite = false
488 if EV_TIMEOUT == event then -- took too long to write some data to socket -> disconnect
489 interface.fatalerror = "timeout during writing"
490 debug( "writing failed:", interface.fatalerror )
492 interface.eventwrite = false
495 if interface._usingssl then -- handle luasec
496 if interface.eventreadtimeout then -- we have to read first
497 local ret = interface.readcallback( ) -- call readcallback
498 --vdebug( "tried to read in writecallback, result:", ret )
500 if interface.eventwritetimeout then -- luasec only
501 interface.eventwritetimeout:close( ) -- first we have to close timeout event which where regged after a wantread error
502 interface.eventwritetimeout = false
505 interface.writebuffer = { t_concat(interface.writebuffer) }
506 local succ, err, byte = interface.conn:send( interface.writebuffer[1], 1, interface.writebufferlen )
507 --vdebug( "write data:", interface.writebuffer, "error:", err, "part:", byte )
508 if succ then -- writing succesful
509 interface.writebuffer[1] = nil
510 interface.writebufferlen = 0
512 if interface.fatalerror then
513 debug "closing client after writing"
514 interface:_close() -- close interface if needed
515 elseif interface.startsslcallback then -- start ssl connection if needed
516 debug "starting ssl handshake after writing"
517 interface.eventstarthandshake = addevent( base, nil, EV_TIMEOUT, interface.startsslcallback, 0 )
518 elseif interface.eventreadtimeout then
519 return EV_WRITE, EV_TIMEOUT
521 interface.eventwrite = nil
523 elseif byte and (err == "timeout" or err == "wantwrite") then -- want write again
524 --vdebug( "writebuffer is not empty:", err )
525 interface.writebuffer[1] = s_sub( interface.writebuffer[1], byte + 1, interface.writebufferlen ) -- new buffer
526 interface.writebufferlen = interface.writebufferlen - byte
527 if "wantread" == err then -- happens only with luasec
528 local callback = function( )
530 interface.eventwritetimeout = nil
533 interface.eventwritetimeout = addevent( base, nil, EV_TIMEOUT, callback, cfg.WRITE_TIMEOUT ) -- reg a new timeout event
534 debug( "wantread during write attempt, reg it in readcallback but dont know what really happens next..." )
535 -- hopefully this works with luasec; its simply not possible to use 2 different write events on a socket in luaevent
538 return EV_WRITE, cfg.WRITE_TIMEOUT
539 else -- connection was closed during writing or fatal error
540 interface.fatalerror = err or "fatal error"
541 debug( "connection failed in write event:", interface.fatalerror )
543 interface.eventwrite = nil
549 interface.readcallback = function( event ) -- called on read events
550 --vdebug( "new client read event, id/ip/port:", tostring(interface.id), tostring(ip), tostring(port) )
551 if interface.noreading or interface.fatalerror then -- leave this event
552 --vdebug( "leaving this event because:", tostring(interface.noreading or interface.fatalerror) )
553 interface.eventread = nil
556 if EV_TIMEOUT == event and interface:onreadtimeout() ~= true then
557 return -1 -- took too long to get some data from client -> disconnect
559 if interface._usingssl then -- handle luasec
560 if interface.eventwritetimeout then -- ok, in the past writecallback was regged
561 local ret = interface.writecallback( ) -- call it
562 --vdebug( "tried to write in readcallback, result:", tostring(ret) )
564 if interface.eventreadtimeout then
565 interface.eventreadtimeout:close( )
566 interface.eventreadtimeout = nil
569 local buffer, err, part = interface.conn:receive( interface._pattern ) -- receive buffer with "pattern"
570 --vdebug( "read data:", tostring(buffer), "error:", tostring(err), "part:", tostring(part) )
571 buffer = buffer or part
572 if buffer and #buffer > cfg.MAX_READ_LENGTH then -- check buffer length
573 interface.fatalerror = "receive buffer exceeded"
574 debug( "fatal error:", interface.fatalerror )
576 interface.eventread = nil
579 if err and ( err ~= "timeout" and err ~= "wantread" ) then
580 if "wantwrite" == err then -- need to read on write event
581 if not interface.eventwrite then -- register new write event if needed
582 interface.eventwrite = addevent( base, interface.conn, EV_WRITE, interface.writecallback, cfg.WRITE_TIMEOUT )
584 interface.eventreadtimeout = addevent( base, nil, EV_TIMEOUT,
587 end, cfg.READ_TIMEOUT
589 debug( "wantwrite during read attempt, reg it in writecallback but dont know what really happens next..." )
590 -- to be honest i dont know what happens next, if it is allowed to first read, the write etc...
591 else -- connection was closed or fatal error
592 interface.fatalerror = err
593 debug( "connection failed in read event:", interface.fatalerror )
595 interface.eventread = nil
599 interface.onincoming( interface, buffer, err ) -- send new data to listener
601 if interface.noreading then
602 interface.eventread = nil;
605 return EV_READ, cfg.READ_TIMEOUT
608 client:settimeout( 0 ) -- set non blocking
609 setmetatable(interface, interface_mt)
610 interfacelist[ interface ] = true -- add to interfacelist
614 local function handleserver( server, addr, port, pattern, listener, sslctx ) -- creates an server interface
615 debug "creating server interface..."
621 onconnect = listener.onconnect; -- will be called when new client connected
622 eventread = false; -- read event handler
623 eventclose = false; -- close event handler
624 readcallback = false; -- read event callback
625 fatalerror = false; -- error message
626 nointerface = true; -- lock/unlock parameter
628 _ip = addr, _port = port, _pattern = pattern,
631 interface.id = tostring(interface):match("%x+$");
632 interface.readcallback = function( event ) -- server handler, called on incoming connections
633 --vdebug( "server can accept, id/addr/port:", interface, addr, port )
634 if interface.fatalerror then
635 --vdebug( "leaving this event because:", self.fatalerror )
636 interface.eventread = nil
639 local delay = cfg.ACCEPT_DELAY
640 if EV_TIMEOUT == event then
641 if interface._connections >= cfg.MAX_CONNECTIONS then -- check connection count
642 debug( "to many connections, seconds to wait for next accept:", delay )
643 return EV_TIMEOUT, delay -- timeout...
645 return EV_READ -- accept again
648 --vdebug("max connection check ok, accepting...")
649 local client, err = server:accept() -- try to accept; TODO: check err
651 if interface._connections >= cfg.MAX_CONNECTIONS then
652 client:close( ) -- refuse connection
653 debug( "maximal connections reached, refuse client connection; accept delay:", delay )
654 return EV_TIMEOUT, delay -- delay for next accept attempt
656 local client_ip, client_port = client:getpeername( )
657 interface._connections = interface._connections + 1 -- increase connection count
658 local clientinterface = handleclient( client, client_ip, client_port, interface, pattern, listener, sslctx )
659 --vdebug( "client id:", clientinterface, "startssl:", startssl )
660 if has_luasec and sslctx then
661 clientinterface:starttls(sslctx, true)
663 clientinterface:_start_session( true )
665 debug( "accepted incoming client connection from:", client_ip or "<unknown IP>", client_port or "<unknown port>", "to", port or "<unknown port>");
667 client, err = server:accept() -- try to accept again
672 server:settimeout( 0 )
673 setmetatable(interface, interface_mt)
674 interfacelist[ interface ] = true
675 interface:_start_session()
679 local function addserver( addr, port, listener, pattern, sslctx, startssl ) -- TODO: check arguments
680 --vdebug( "creating new tcp server with following parameters:", addr or "nil", port or "nil", sslctx or "nil", startssl or "nil")
681 if sslctx and not has_luasec then
682 debug "fatal error: luasec not found"
683 return nil, "luasec not found"
685 local server, err = socket.bind( addr, port, cfg.ACCEPT_QUEUE ) -- create server socket
687 debug( "creating server socket on "..addr.." port "..port.." failed:", err )
690 local interface = handleserver( server, addr, port, pattern, listener, sslctx, startssl ) -- new server handler
691 debug( "new server created with id:", tostring(interface))
695 local function wrapclient( client, ip, port, listeners, pattern, sslctx )
696 local interface = handleclient( client, ip, port, nil, pattern, listeners, sslctx )
697 interface:_start_connection(sslctx)
698 return interface, client
699 --function handleclient( client, ip, port, server, pattern, listener, _, sslctx ) -- creates an client interface
702 local function addclient( addr, serverport, listener, pattern, sslctx, typ )
703 if sslctx and not has_luasec then
704 debug "need luasec, but not available"
705 return nil, "luasec not found"
708 local addrinfo, err = getaddrinfo(addr)
709 if not addrinfo then return nil, err end
710 if addrinfo[1] and addrinfo[1].family == "inet6" then
716 local create = socket[typ]
717 if type( create ) ~= "function" then
718 return nil, "invalid socket type"
720 local client, err = create() -- creating new socket
722 debug( "cannot create socket:", err )
725 client:settimeout( 0 ) -- set nonblocking
726 local res, err = client:connect( addr, serverport ) -- connect
727 if res or ( err == "timeout" ) then
728 local ip, port = client:getsockname( )
729 local interface = wrapclient( client, ip, serverport, listener, pattern, sslctx )
730 interface:_start_connection( sslctx )
731 debug( "new connection id:", interface.id )
732 return interface, err
734 debug( "new connection failed:", err )
739 local function loop( ) -- starts the event loop
744 local function newevent( ... )
745 return addevent( base, ... )
748 local function closeallservers ( arg )
749 for item in pairs( interfacelist ) do
750 if item.type == "server" then
756 local function setquitting(yes)
764 local function get_backend()
765 return base:method();
768 -- We need to hold onto the events to stop them
769 -- being garbage-collected
770 local signal_events = {}; -- [signal_num] -> event object
771 local function hook_signal(signal_num, handler)
772 local function _handler()
773 local ret = handler();
774 if ret ~= false then -- Continue handling this signal?
775 return EV_SIGNAL; -- Yes
777 return -1; -- Close this event
779 signal_events[signal_num] = base:addevent(signal_num, EV_SIGNAL, _handler);
780 return signal_events[signal_num];
783 local function link(sender, receiver, buffersize)
786 function receiver:ondrain()
787 if sender_locked then
793 function sender:onincoming(data)
794 receiver:write(data);
795 if receiver.writebufferlen >= buffersize then
796 sender_locked = true;
800 sender:set_mode("*a");
811 addserver = addserver,
812 addclient = addclient,
813 wrapclient = wrapclient,
814 setquitting = setquitting,
815 closeall = closeallservers,
816 get_backend = get_backend,
817 hook_signal = hook_signal,
819 __NAME = SCRIPT_NAME,
820 __DATE = LAST_MODIFIED,
821 __AUTHOR = SCRIPT_AUTHOR,
822 __VERSION = SCRIPT_VERSION,