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 -- never call eventcallback:close( ) from inside eventcallback
10 -- to do some of the above, use timeout events or something what will called from outside
11 -- dont let garbagecollect eventcallbacks, as long they are running
12 -- when using luasec, there are 4 cases of timeout errors: wantread or wantwrite during reading or writing
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_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"
45 local socket = use "socket" or require "socket"
47 local log = require ("util.logger").init("socket")
49 local function debug(...)
50 return log("debug", ("%s "):rep(select('#', ...)), ...)
54 local bitor = ( function( ) -- thx Rici Lake
55 local hasbit = function( x, p )
56 return x % ( p + p ) >= p
58 return function( x, y )
61 local limit = x > y and x or y
63 if hasbit( x, p ) or hasbit( y, p ) then
72 local event = require "luaevent.core"
73 local base = event.new( )
74 local EV_READ = event.EV_READ
75 local EV_WRITE = event.EV_WRITE
76 local EV_TIMEOUT = event.EV_TIMEOUT
77 local EV_SIGNAL = event.EV_SIGNAL
79 local EV_READWRITE = bitor( EV_READ, EV_WRITE )
81 local interfacelist = ( function( ) -- holds the interfaces for sockets
84 return function( method, arg )
85 if "add" == method then
90 elseif "delete" == method then
92 return nil, "array is already empty"
94 local position = arg:_position() -- get position in array
95 if position ~= len then
96 local interface = array[ len ] -- get last interface
97 array[ position ] = interface -- copy it into free position
98 array[ len ] = nil -- free last position
99 interface:_position( position ) -- set new position in array
100 else -- free last position
111 -- Client interface methods
114 interface_mt = {}; interface_mt.__index = interface_mt;
116 local addevent = base.addevent
117 local coroutine_wrap, coroutine_yield = coroutine.wrap,coroutine.yield
118 local string_len = string.len
121 function interface_mt:_position(new_position)
122 self.position = new_position or self.position
123 return self.position;
125 function interface_mt:_close() -- regs event to start self:_destroy()
126 local callback = function( )
128 self.eventclose = nil
131 self.eventclose = addevent( base, nil, EV_TIMEOUT, callback, 0 )
135 function interface_mt:_start_connection(plainssl) -- should be called from addclient
136 local callback = function( event )
137 if EV_TIMEOUT == event then -- timeout during connection
138 self.fatalerror = "connection timeout"
139 self:ontimeout() -- call timeout listener
141 debug( "new connection failed. id:", self.id, "error:", self.fatalerror )
143 if plainssl and ssl then -- start ssl session
144 self:starttls(self._sslctx, true)
145 else -- normal connection
146 self:_start_session(true)
148 debug( "new connection established. id:", self.id )
150 self.eventconnect = nil
153 self.eventconnect = addevent( base, self.conn, EV_WRITE, callback, cfg.CONNECT_TIMEOUT )
156 function interface_mt:_start_session(call_onconnect) -- new session, for example after startssl
157 if self.type == "client" then
158 local callback = function( )
159 self:_lock( false, false, false )
160 --vdebug( "start listening on client socket with id:", self.id )
161 self.eventread = addevent( base, self.conn, EV_READ, self.readcallback, cfg.READ_TIMEOUT ); -- register callback
162 if call_onconnect then
165 self.eventsession = nil
168 self.eventsession = addevent( base, nil, EV_TIMEOUT, callback, 0 )
171 --vdebug( "start listening on server socket with id:", self.id )
172 self.eventread = addevent( base, self.conn, EV_READ, self.readcallback ) -- register callback
176 function interface_mt:_start_ssl(call_onconnect) -- old socket will be destroyed, therefore we have to close read/write events first
177 --vdebug( "starting ssl session with client id:", self.id )
179 _ = self.eventread and self.eventread:close( ) -- close events; this must be called outside of the event callbacks!
180 _ = self.eventwrite and self.eventwrite:close( )
181 self.eventread, self.eventwrite = nil, nil
183 self.conn, err = ssl.wrap( self.conn, self._sslctx )
185 self.fatalerror = err
186 self.conn = nil -- cannot be used anymore
187 if call_onconnect then
188 self.ondisconnect = nil -- dont call this when client isnt really connected
191 debug( "fatal error while ssl wrapping:", err )
194 self.conn:settimeout( 0 ) -- set non blocking
195 local handshakecallback = coroutine_wrap(
199 local maxattempt = cfg.MAX_HANDSHAKE_ATTEMPTS
200 while attempt < maxattempt do -- no endless loop
201 attempt = attempt + 1
202 debug( "ssl handshake of client with id:"..tostring(self)..", attempt:"..attempt )
203 if attempt > maxattempt then
204 self.fatalerror = "max handshake attempts exceeded"
205 elseif EV_TIMEOUT == event then
206 self.fatalerror = "timeout during handshake"
208 _, err = self.conn:dohandshake( )
210 self:_lock( false, false, false ) -- unlock the interface; sending, closing etc allowed
211 self.send = self.conn.send -- caching table lookups with new client object
212 self.receive = self.conn.receive
213 if not call_onconnect then -- trigger listener
214 self:onstatus("ssl-handshake-complete");
216 self:_start_session( call_onconnect )
217 debug( "ssl handshake done" )
218 self.eventhandshake = nil
221 if err == "wantwrite" then
223 elseif err == "wantread" then
226 debug( "ssl handshake error:", err )
227 self.fatalerror = err
230 if self.fatalerror then
231 if call_onconnect then
232 self.ondisconnect = nil -- dont call this when client isnt really connected
235 debug( "handshake failed because:", self.fatalerror )
236 self.eventhandshake = nil
239 event = coroutine_yield( event, cfg.HANDSHAKE_TIMEOUT ) -- yield this monster...
243 debug "starting handshake..."
244 self:_lock( false, true, true ) -- unlock read/write events, but keep interface locked
245 self.eventhandshake = addevent( base, self.conn, EV_READWRITE, handshakecallback, cfg.HANDSHAKE_TIMEOUT )
248 function interface_mt:_destroy() -- close this interface + events and call last listener
249 debug( "closing client with id:", self.id, self.fatalerror )
250 self:_lock( true, true, true ) -- first of all, lock the interface to avoid further actions
252 _ = self.eventread and self.eventread:close( ) -- close events; this must be called outside of the event callbacks!
253 if self.type == "client" then
254 _ = self.eventwrite and self.eventwrite:close( )
255 _ = self.eventhandshake and self.eventhandshake:close( )
256 _ = self.eventstarthandshake and self.eventstarthandshake:close( )
257 _ = self.eventconnect and self.eventconnect:close( )
258 _ = self.eventsession and self.eventsession:close( )
259 _ = self.eventwritetimeout and self.eventwritetimeout:close( )
260 _ = self.eventreadtimeout and self.eventreadtimeout:close( )
261 _ = 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)
262 _ = self.conn and self.conn:close( ) -- close connection, must also be called outside of any socket registered events!
263 _ = self._server and self._server:counter(-1);
264 self.eventread, self.eventwrite = nil, nil
265 self.eventstarthandshake, self.eventhandshake, self.eventclose = nil, nil, nil
266 self.readcallback, self.writecallback = nil, nil
269 self.eventread, self.eventclose = nil, nil
270 self.interface, self.readcallback = nil, nil
272 interfacelist( "delete", self )
276 function interface_mt:_lock(nointerface, noreading, nowriting) -- lock or unlock this interface or events
277 self.nointerface, self.noreading, self.nowriting = nointerface, noreading, nowriting
278 return nointerface, noreading, nowriting
282 function interface_mt:lock_read(switch)
286 return self:resume();
290 function interface_mt:pause()
291 return self:_lock(self.nointerface, true, self.nowriting);
294 function interface_mt:resume()
295 self:_lock(self.nointerface, false, self.nowriting);
296 if not self.eventread then
297 self.eventread = addevent( base, self.conn, EV_READ, self.readcallback, cfg.READ_TIMEOUT ); -- register callback
301 function interface_mt:counter(c)
303 self._connections = self._connections + c
305 return self._connections
309 function interface_mt:write(data)
310 if self.nowriting then return nil, "locked" end
311 --vdebug( "try to send data to client, id/data:", self.id, data )
312 data = tostring( data )
313 local len = string_len( data )
314 local total = len + self.writebufferlen
315 if total > cfg.MAX_SEND_LENGTH then -- check buffer length
316 local err = "send buffer exceeded"
317 debug( "error:", err ) -- to much, check your app
320 self.writebuffer = self.writebuffer .. data -- new buffer
321 self.writebufferlen = total
322 if not self.eventwrite then -- register new write event
323 --vdebug( "register new write event" )
324 self.eventwrite = addevent( base, self.conn, EV_WRITE, self.writecallback, cfg.WRITE_TIMEOUT )
328 function interface_mt:close()
329 if self.nointerface then return nil, "locked"; end
330 debug( "try to close client connection with id:", self.id )
331 if self.type == "client" then
332 self.fatalerror = "client to close"
333 if self.eventwrite then -- wait for incomplete write request
334 self:_lock( true, true, false )
335 debug "closing delayed until writebuffer is empty"
336 return nil, "writebuffer not empty, waiting"
338 self:_lock( true, true, true )
343 debug( "try to close server with id:", tostring(self.id))
344 self.fatalerror = "server to close"
346 self:_close( 0 ) -- add new event to remove the server interface
351 function interface_mt:socket()
355 function interface_mt:server()
356 return self._server or self;
359 function interface_mt:port()
363 function interface_mt:serverport()
364 return self._serverport
367 function interface_mt:ip()
371 function interface_mt:ssl()
372 return self._usingssl
375 function interface_mt:type()
376 return self._type or "client"
379 function interface_mt:connections()
380 return self._connections
383 function interface_mt:address()
387 function interface_mt:set_sslctx(sslctx)
388 self._sslctx = sslctx;
390 self.starttls = nil; -- use starttls() of interface_mt
392 self.starttls = false; -- prevent starttls()
396 function interface_mt:set_mode(pattern)
398 self._pattern = pattern;
400 return self._pattern;
403 function interface_mt:set_send(new_send)
404 -- No-op, we always use the underlying connection's send
407 function interface_mt:starttls(sslctx, call_onconnect)
408 debug( "try to start ssl at client id:", self.id )
410 self._sslctx = sslctx;
411 if self._usingssl then -- startssl was already called
412 err = "ssl already active"
415 debug( "error:", err )
418 self._usingssl = true
419 self.startsslcallback = function( ) -- we have to start the handshake outside of a read/write event
420 self.startsslcallback = nil
421 self:_start_ssl(call_onconnect);
422 self.eventstarthandshake = nil
425 if not self.eventwrite then
426 self:_lock( true, true, true ) -- lock the interface, to not disturb the handshake
427 self.eventstarthandshake = addevent( base, nil, EV_TIMEOUT, self.startsslcallback, 0 ) -- add event to start handshake
428 else -- wait until writebuffer is empty
429 self:_lock( true, true, false )
430 debug "ssl session delayed until writebuffer is empty..."
432 self.starttls = false;
436 function interface_mt:setoption(option, value)
437 if self.conn.setoption then
438 return self.conn:setoption(option, value);
440 return false, "setoption not implemented";
443 function interface_mt:setlistener(listener)
444 self.onconnect, self.ondisconnect, self.onincoming, self.ontimeout, self.onstatus
445 = listener.onconnect, listener.ondisconnect, listener.onincoming, listener.ontimeout, listener.onstatus;
449 function interface_mt:onconnect()
451 function interface_mt:onincoming()
453 function interface_mt:ondisconnect()
455 function interface_mt:ontimeout()
457 function interface_mt:ondrain()
459 function interface_mt:onstatus()
463 -- End of client interface methods
467 local string_sub = string.sub -- caching table lookups
468 local string_len = string.len
469 local addevent = base.addevent
470 local socket_gettime = socket.gettime
471 function handleclient( client, ip, port, server, pattern, listener, sslctx ) -- creates an client interface
472 --vdebug("creating client interfacce...")
476 currenttime = socket_gettime( ); -- safe the origin
477 writebuffer = ""; -- writebuffer
478 writebufferlen = 0; -- length of writebuffer
479 send = client.send; -- caching table lookups
480 receive = client.receive;
481 onconnect = listener.onconnect; -- will be called when client disconnects
482 ondisconnect = listener.ondisconnect; -- will be called when client disconnects
483 onincoming = listener.onincoming; -- will be called when client sends data
484 ontimeout = listener.ontimeout; -- called when fatal socket timeout occurs
485 onstatus = listener.onstatus; -- called for status changes (e.g. of SSL/TLS)
486 eventread = false, eventwrite = false, eventclose = false,
487 eventhandshake = false, eventstarthandshake = false; -- event handler
488 eventconnect = false, eventsession = false; -- more event handler...
489 eventwritetimeout = false; -- even more event handler...
490 eventreadtimeout = false;
491 fatalerror = false; -- error message
492 writecallback = false; -- will be called on write events
493 readcallback = false; -- will be called on read events
494 nointerface = true; -- lock/unlock parameter of this interface
495 noreading = false, nowriting = false; -- locks of the read/writecallback
496 startsslcallback = false; -- starting handshake callback
497 position = false; -- position of client in interfacelist
500 _ip = ip, _port = port, _server = server, _pattern = pattern,
501 _serverport = (server and server:port() or nil),
502 _sslctx = sslctx; -- parameters
503 _usingssl = false; -- client is using ssl;
505 if not ssl then interface.starttls = false; end
506 interface.id = tostring(interface):match("%x+$");
507 interface.writecallback = function( event ) -- called on write events
508 --vdebug( "new client write event, id/ip/port:", interface, ip, port )
509 if interface.nowriting or ( interface.fatalerror and ( "client to close" ~= interface.fatalerror ) ) then -- leave this event
510 --vdebug( "leaving this event because:", interface.nowriting or interface.fatalerror )
511 interface.eventwrite = false
514 if EV_TIMEOUT == event then -- took too long to write some data to socket -> disconnect
515 interface.fatalerror = "timeout during writing"
516 debug( "writing failed:", interface.fatalerror )
518 interface.eventwrite = false
521 if interface._usingssl then -- handle luasec
522 if interface.eventreadtimeout then -- we have to read first
523 local ret = interface.readcallback( ) -- call readcallback
524 --vdebug( "tried to read in writecallback, result:", ret )
526 if interface.eventwritetimeout then -- luasec only
527 interface.eventwritetimeout:close( ) -- first we have to close timeout event which where regged after a wantread error
528 interface.eventwritetimeout = false
531 local succ, err, byte = interface.conn:send( interface.writebuffer, 1, interface.writebufferlen )
532 --vdebug( "write data:", interface.writebuffer, "error:", err, "part:", byte )
533 if succ then -- writing succesful
534 interface.writebuffer = ""
535 interface.writebufferlen = 0
537 if interface.fatalerror then
538 debug "closing client after writing"
539 interface:_close() -- close interface if needed
540 elseif interface.startsslcallback then -- start ssl connection if needed
541 debug "starting ssl handshake after writing"
542 interface.eventstarthandshake = addevent( base, nil, EV_TIMEOUT, interface.startsslcallback, 0 )
543 elseif interface.eventreadtimeout then
544 return EV_WRITE, EV_TIMEOUT
546 interface.eventwrite = nil
548 elseif byte and (err == "timeout" or err == "wantwrite") then -- want write again
549 --vdebug( "writebuffer is not empty:", err )
550 interface.writebuffer = string_sub( interface.writebuffer, byte + 1, interface.writebufferlen ) -- new buffer
551 interface.writebufferlen = interface.writebufferlen - byte
552 if "wantread" == err then -- happens only with luasec
553 local callback = function( )
555 interface.eventwritetimeout = nil
558 interface.eventwritetimeout = addevent( base, nil, EV_TIMEOUT, callback, cfg.WRITE_TIMEOUT ) -- reg a new timeout event
559 debug( "wantread during write attempt, reg it in readcallback but dont know what really happens next..." )
560 -- hopefully this works with luasec; its simply not possible to use 2 different write events on a socket in luaevent
563 return EV_WRITE, cfg.WRITE_TIMEOUT
564 else -- connection was closed during writing or fatal error
565 interface.fatalerror = err or "fatal error"
566 debug( "connection failed in write event:", interface.fatalerror )
568 interface.eventwrite = nil
574 interface.readcallback = function( event ) -- called on read events
575 --vdebug( "new client read event, id/ip/port:", tostring(interface.id), tostring(ip), tostring(port) )
576 if interface.noreading or interface.fatalerror then -- leave this event
577 --vdebug( "leaving this event because:", tostring(interface.noreading or interface.fatalerror) )
578 interface.eventread = nil
581 if EV_TIMEOUT == event then -- took too long to get some data from client -> disconnect
582 interface.fatalerror = "timeout during receiving"
583 debug( "connection failed:", interface.fatalerror )
585 interface.eventread = nil
588 if interface._usingssl then -- handle luasec
589 if interface.eventwritetimeout then -- ok, in the past writecallback was regged
590 local ret = interface.writecallback( ) -- call it
591 --vdebug( "tried to write in readcallback, result:", tostring(ret) )
593 if interface.eventreadtimeout then
594 interface.eventreadtimeout:close( )
595 interface.eventreadtimeout = nil
598 local buffer, err, part = interface.conn:receive( interface._pattern ) -- receive buffer with "pattern"
599 --vdebug( "read data:", tostring(buffer), "error:", tostring(err), "part:", tostring(part) )
600 buffer = buffer or part or ""
601 local len = string_len( buffer )
602 if len > cfg.MAX_READ_LENGTH then -- check buffer length
603 interface.fatalerror = "receive buffer exceeded"
604 debug( "fatal error:", interface.fatalerror )
606 interface.eventread = nil
609 interface.onincoming( interface, buffer, err ) -- send new data to listener
610 if err and ( err ~= "timeout" and err ~= "wantread" ) then
611 if "wantwrite" == err then -- need to read on write event
612 if not interface.eventwrite then -- register new write event if needed
613 interface.eventwrite = addevent( base, interface.conn, EV_WRITE, interface.writecallback, cfg.WRITE_TIMEOUT )
615 interface.eventreadtimeout = addevent( base, nil, EV_TIMEOUT,
618 end, cfg.READ_TIMEOUT
620 debug( "wantwrite during read attempt, reg it in writecallback but dont know what really happens next..." )
621 -- to be honest i dont know what happens next, if it is allowed to first read, the write etc...
622 else -- connection was closed or fatal error
623 interface.fatalerror = err
624 debug( "connection failed in read event:", interface.fatalerror )
626 interface.eventread = nil
630 if interface.noreading then
631 interface.eventread = nil;
634 return EV_READ, cfg.READ_TIMEOUT
638 client:settimeout( 0 ) -- set non blocking
639 setmetatable(interface, interface_mt)
640 interfacelist( "add", interface ) -- add to interfacelist
647 function handleserver( server, addr, port, pattern, listener, sslctx ) -- creates an server interface
648 debug "creating server interface..."
653 onconnect = listener.onconnect; -- will be called when new client connected
654 eventread = false; -- read event handler
655 eventclose = false; -- close event handler
656 readcallback = false; -- read event callback
657 fatalerror = false; -- error message
658 nointerface = true; -- lock/unlock parameter
660 _ip = addr, _port = port, _pattern = pattern,
663 interface.id = tostring(interface):match("%x+$");
664 interface.readcallback = function( event ) -- server handler, called on incoming connections
665 --vdebug( "server can accept, id/addr/port:", interface, addr, port )
666 if interface.fatalerror then
667 --vdebug( "leaving this event because:", self.fatalerror )
668 interface.eventread = nil
671 local delay = cfg.ACCEPT_DELAY
672 if EV_TIMEOUT == event then
673 if interface._connections >= cfg.MAX_CONNECTIONS then -- check connection count
674 debug( "to many connections, seconds to wait for next accept:", delay )
675 return EV_TIMEOUT, delay -- timeout...
677 return EV_READ -- accept again
680 --vdebug("max connection check ok, accepting...")
681 local client, err = server:accept() -- try to accept; TODO: check err
683 if interface._connections >= cfg.MAX_CONNECTIONS then
684 client:close( ) -- refuse connection
685 debug( "maximal connections reached, refuse client connection; accept delay:", delay )
686 return EV_TIMEOUT, delay -- delay for next accept attempt
688 local client_ip, client_port = client:getpeername( )
689 interface._connections = interface._connections + 1 -- increase connection count
690 local clientinterface = handleclient( client, client_ip, client_port, interface, pattern, listener, sslctx )
691 --vdebug( "client id:", clientinterface, "startssl:", startssl )
692 if ssl and sslctx then
693 clientinterface:starttls(sslctx, true)
695 clientinterface:_start_session( true )
697 debug( "accepted incoming client connection from:", client_ip or "<unknown IP>", client_port or "<unknown port>", "to", port or "<unknown port>");
699 client, err = server:accept() -- try to accept again
704 server:settimeout( 0 )
705 setmetatable(interface, interface_mt)
706 interfacelist( "add", interface )
707 interface:_start_session()
712 local addserver = ( function( )
713 return function( addr, port, listener, pattern, sslcfg, startssl ) -- TODO: check arguments
714 --vdebug( "creating new tcp server with following parameters:", addr or "nil", port or "nil", sslcfg or "nil", startssl or "nil")
715 local server, err = socket.bind( addr, port, cfg.ACCEPT_QUEUE ) -- create server socket
717 debug( "creating server socket on "..addr.." port "..port.." failed:", err )
723 debug "fatal error: luasec not found"
724 return nil, "luasec not found"
728 debug( "error while creating new ssl context for server socket:", err )
732 local interface = handleserver( server, addr, port, pattern, listener, sslctx, startssl ) -- new server handler
733 debug( "new server created with id:", tostring(interface))
738 local addclient, wrapclient
740 function wrapclient( client, ip, port, listeners, pattern, sslctx )
741 local interface = handleclient( client, ip, port, nil, pattern, listeners, sslctx )
742 interface:_start_connection(sslctx)
743 return interface, client
744 --function handleclient( client, ip, port, server, pattern, listener, _, sslctx ) -- creates an client interface
747 function addclient( addr, serverport, listener, pattern, localaddr, localport, sslcfg, startssl )
748 local client, err = socket.tcp() -- creating new socket
750 debug( "cannot create socket:", err )
753 client:settimeout( 0 ) -- set nonblocking
755 local res, err = client:bind( localaddr, localport, -1 )
757 debug( "cannot bind client:", err )
762 if sslcfg then -- handle ssl/new context
764 debug "need luasec, but not available"
765 return nil, "luasec not found"
769 debug( "cannot create new ssl context:", err )
773 local res, err = client:connect( addr, serverport ) -- connect
774 if res or ( err == "timeout" ) then
775 local ip, port = client:getsockname( )
776 local interface = wrapclient( client, ip, serverport, listener, pattern, sslctx, startssl )
777 interface:_start_connection( startssl )
778 debug( "new connection id:", interface.id )
779 return interface, err
781 debug( "new connection failed:", err )
788 local loop = function( ) -- starts the event loop
793 local newevent = ( function( )
794 local add = base.addevent
795 return function( ... )
796 return add( base, ... )
800 local closeallservers = function( arg )
801 for _, item in ipairs( interfacelist( ) ) do
802 if item.type == "server" then
808 local function setquitting(yes)
816 local function get_backend()
817 return base:method();
820 -- We need to hold onto the events to stop them
821 -- being garbage-collected
822 local signal_events = {}; -- [signal_num] -> event object
823 local function hook_signal(signal_num, handler)
824 local function _handler(event)
825 local ret = handler();
826 if ret ~= false then -- Continue handling this signal?
827 return EV_SIGNAL; -- Yes
829 return -1; -- Close this event
831 signal_events[signal_num] = base:addevent(signal_num, EV_SIGNAL, _handler);
832 return signal_events[signal_num];
835 local function link(sender, receiver, buffersize)
838 function receiver:ondrain()
839 if sender_locked then
845 function sender:onincoming(data)
846 receiver:write(data);
847 if receiver.writebufferlen >= buffersize then
848 sender_locked = true;
863 addserver = addserver,
864 addclient = addclient,
865 wrapclient = wrapclient,
866 setquitting = setquitting,
867 closeall = closeallservers,
868 get_backend = get_backend,
869 hook_signal = hook_signal,
871 __NAME = SCRIPT_NAME,
872 __DATE = LAST_MODIFIED,
873 __AUTHOR = SCRIPT_AUTHOR,
874 __VERSION = SCRIPT_VERSION,