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
120 function interface_mt:_position(new_position)
121 self.position = new_position or self.position
122 return self.position;
124 function interface_mt:_close() -- regs event to start self:_destroy()
125 local callback = function( )
127 self.eventclose = nil
130 self.eventclose = addevent( base, nil, EV_TIMEOUT, callback, 0 )
134 function interface_mt:_start_connection(plainssl) -- should be called from addclient
135 local callback = function( event )
136 if EV_TIMEOUT == event then -- timeout during connection
137 self.fatalerror = "connection timeout"
138 self:ontimeout() -- call timeout listener
140 debug( "new connection failed. id:", self.id, "error:", self.fatalerror )
142 if plainssl and ssl then -- start ssl session
143 self:starttls(self._sslctx, true)
144 else -- normal connection
145 self:_start_session(true)
147 debug( "new connection established. id:", self.id )
149 self.eventconnect = nil
152 self.eventconnect = addevent( base, self.conn, EV_WRITE, callback, cfg.CONNECT_TIMEOUT )
155 function interface_mt:_start_session(call_onconnect) -- new session, for example after startssl
156 if self.type == "client" then
157 local callback = function( )
158 self:_lock( false, false, false )
159 --vdebug( "start listening on client socket with id:", self.id )
160 self.eventread = addevent( base, self.conn, EV_READ, self.readcallback, cfg.READ_TIMEOUT ); -- register callback
161 if call_onconnect then
164 self.eventsession = nil
167 self.eventsession = addevent( base, nil, EV_TIMEOUT, callback, 0 )
170 --vdebug( "start listening on server socket with id:", self.id )
171 self.eventread = addevent( base, self.conn, EV_READ, self.readcallback ) -- register callback
175 function interface_mt:_start_ssl(call_onconnect) -- old socket will be destroyed, therefore we have to close read/write events first
176 --vdebug( "starting ssl session with client id:", self.id )
178 _ = self.eventread and self.eventread:close( ) -- close events; this must be called outside of the event callbacks!
179 _ = self.eventwrite and self.eventwrite:close( )
180 self.eventread, self.eventwrite = nil, nil
182 self.conn, err = ssl.wrap( self.conn, self._sslctx )
184 self.fatalerror = err
185 self.conn = nil -- cannot be used anymore
186 if call_onconnect then
187 self.ondisconnect = nil -- dont call this when client isnt really connected
190 debug( "fatal error while ssl wrapping:", err )
193 self.conn:settimeout( 0 ) -- set non blocking
194 local handshakecallback = coroutine_wrap(
198 local maxattempt = cfg.MAX_HANDSHAKE_ATTEMPTS
199 while attempt < maxattempt do -- no endless loop
200 attempt = attempt + 1
201 debug( "ssl handshake of client with id:"..tostring(self)..", attempt:"..attempt )
202 if attempt > maxattempt then
203 self.fatalerror = "max handshake attempts exceeded"
204 elseif EV_TIMEOUT == event then
205 self.fatalerror = "timeout during handshake"
207 _, err = self.conn:dohandshake( )
209 self:_lock( false, false, false ) -- unlock the interface; sending, closing etc allowed
210 self.send = self.conn.send -- caching table lookups with new client object
211 self.receive = self.conn.receive
212 if not call_onconnect then -- trigger listener
213 self:onstatus("ssl-handshake-complete");
215 self:_start_session( call_onconnect )
216 debug( "ssl handshake done" )
217 self.eventhandshake = nil
220 if err == "wantwrite" then
222 elseif err == "wantread" then
225 debug( "ssl handshake error:", err )
226 self.fatalerror = err
229 if self.fatalerror then
230 if call_onconnect then
231 self.ondisconnect = nil -- dont call this when client isnt really connected
234 debug( "handshake failed because:", self.fatalerror )
235 self.eventhandshake = nil
238 event = coroutine_yield( event, cfg.HANDSHAKE_TIMEOUT ) -- yield this monster...
242 debug "starting handshake..."
243 self:_lock( false, true, true ) -- unlock read/write events, but keep interface locked
244 self.eventhandshake = addevent( base, self.conn, EV_READWRITE, handshakecallback, cfg.HANDSHAKE_TIMEOUT )
247 function interface_mt:_destroy() -- close this interface + events and call last listener
248 debug( "closing client with id:", self.id, self.fatalerror )
249 self:_lock( true, true, true ) -- first of all, lock the interface to avoid further actions
251 _ = self.eventread and self.eventread:close( ) -- close events; this must be called outside of the event callbacks!
252 if self.type == "client" then
253 _ = self.eventwrite and self.eventwrite:close( )
254 _ = self.eventhandshake and self.eventhandshake:close( )
255 _ = self.eventstarthandshake and self.eventstarthandshake:close( )
256 _ = self.eventconnect and self.eventconnect:close( )
257 _ = self.eventsession and self.eventsession:close( )
258 _ = self.eventwritetimeout and self.eventwritetimeout:close( )
259 _ = self.eventreadtimeout and self.eventreadtimeout:close( )
260 _ = 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)
261 _ = self.conn and self.conn:close( ) -- close connection, must also be called outside of any socket registered events!
262 _ = self._server and self._server:counter(-1);
263 self.eventread, self.eventwrite = nil, nil
264 self.eventstarthandshake, self.eventhandshake, self.eventclose = nil, nil, nil
265 self.readcallback, self.writecallback = nil, nil
268 self.eventread, self.eventclose = nil, nil
269 self.interface, self.readcallback = nil, nil
271 interfacelist( "delete", self )
275 function interface_mt:_lock(nointerface, noreading, nowriting) -- lock or unlock this interface or events
276 self.nointerface, self.noreading, self.nowriting = nointerface, noreading, nowriting
277 return nointerface, noreading, nowriting
281 function interface_mt:lock_read(switch)
285 return self:resume();
289 function interface_mt:pause()
290 return self:_lock(self.nointerface, true, self.nowriting);
293 function interface_mt:resume()
294 self:_lock(self.nointerface, false, self.nowriting);
295 if not self.eventread then
296 self.eventread = addevent( base, self.conn, EV_READ, self.readcallback, cfg.READ_TIMEOUT ); -- register callback
300 function interface_mt:counter(c)
302 self._connections = self._connections + c
304 return self._connections
308 function interface_mt:write(data)
309 if self.nowriting then return nil, "locked" end
310 --vdebug( "try to send data to client, id/data:", self.id, data )
311 data = tostring( data )
313 local total = len + self.writebufferlen
314 if total > cfg.MAX_SEND_LENGTH then -- check buffer length
315 local err = "send buffer exceeded"
316 debug( "error:", err ) -- to much, check your app
319 self.writebuffer = self.writebuffer .. data -- new buffer
320 self.writebufferlen = total
321 if not self.eventwrite then -- register new write event
322 --vdebug( "register new write event" )
323 self.eventwrite = addevent( base, self.conn, EV_WRITE, self.writecallback, cfg.WRITE_TIMEOUT )
327 function interface_mt:close()
328 if self.nointerface then return nil, "locked"; end
329 debug( "try to close client connection with id:", self.id )
330 if self.type == "client" then
331 self.fatalerror = "client to close"
332 if self.eventwrite then -- wait for incomplete write request
333 self:_lock( true, true, false )
334 debug "closing delayed until writebuffer is empty"
335 return nil, "writebuffer not empty, waiting"
337 self:_lock( true, true, true )
342 debug( "try to close server with id:", tostring(self.id))
343 self.fatalerror = "server to close"
345 self:_close( 0 ) -- add new event to remove the server interface
350 function interface_mt:socket()
354 function interface_mt:server()
355 return self._server or self;
358 function interface_mt:port()
362 function interface_mt:serverport()
363 return self._serverport
366 function interface_mt:ip()
370 function interface_mt:ssl()
371 return self._usingssl
374 function interface_mt:type()
375 return self._type or "client"
378 function interface_mt:connections()
379 return self._connections
382 function interface_mt:address()
386 function interface_mt:set_sslctx(sslctx)
387 self._sslctx = sslctx;
389 self.starttls = nil; -- use starttls() of interface_mt
391 self.starttls = false; -- prevent starttls()
395 function interface_mt:set_mode(pattern)
397 self._pattern = pattern;
399 return self._pattern;
402 function interface_mt:set_send(new_send)
403 -- No-op, we always use the underlying connection's send
406 function interface_mt:starttls(sslctx, call_onconnect)
407 debug( "try to start ssl at client id:", self.id )
409 self._sslctx = sslctx;
410 if self._usingssl then -- startssl was already called
411 err = "ssl already active"
414 debug( "error:", err )
417 self._usingssl = true
418 self.startsslcallback = function( ) -- we have to start the handshake outside of a read/write event
419 self.startsslcallback = nil
420 self:_start_ssl(call_onconnect);
421 self.eventstarthandshake = nil
424 if not self.eventwrite then
425 self:_lock( true, true, true ) -- lock the interface, to not disturb the handshake
426 self.eventstarthandshake = addevent( base, nil, EV_TIMEOUT, self.startsslcallback, 0 ) -- add event to start handshake
427 else -- wait until writebuffer is empty
428 self:_lock( true, true, false )
429 debug "ssl session delayed until writebuffer is empty..."
431 self.starttls = false;
435 function interface_mt:setoption(option, value)
436 if self.conn.setoption then
437 return self.conn:setoption(option, value);
439 return false, "setoption not implemented";
442 function interface_mt:setlistener(listener)
443 self.onconnect, self.ondisconnect, self.onincoming, self.ontimeout, self.onstatus
444 = listener.onconnect, listener.ondisconnect, listener.onincoming, listener.ontimeout, listener.onstatus;
448 function interface_mt:onconnect()
450 function interface_mt:onincoming()
452 function interface_mt:ondisconnect()
454 function interface_mt:ontimeout()
456 function interface_mt:ondrain()
458 function interface_mt:onstatus()
462 -- End of client interface methods
466 local string_sub = string.sub -- caching table lookups
467 local string_len = string.len
468 local addevent = base.addevent
469 local socket_gettime = socket.gettime
470 function handleclient( client, ip, port, server, pattern, listener, sslctx ) -- creates an client interface
471 --vdebug("creating client interfacce...")
475 currenttime = socket_gettime( ); -- safe the origin
476 writebuffer = ""; -- writebuffer
477 writebufferlen = 0; -- length of writebuffer
478 send = client.send; -- caching table lookups
479 receive = client.receive;
480 onconnect = listener.onconnect; -- will be called when client disconnects
481 ondisconnect = listener.ondisconnect; -- will be called when client disconnects
482 onincoming = listener.onincoming; -- will be called when client sends data
483 ontimeout = listener.ontimeout; -- called when fatal socket timeout occurs
484 onstatus = listener.onstatus; -- called for status changes (e.g. of SSL/TLS)
485 eventread = false, eventwrite = false, eventclose = false,
486 eventhandshake = false, eventstarthandshake = false; -- event handler
487 eventconnect = false, eventsession = false; -- more event handler...
488 eventwritetimeout = false; -- even more event handler...
489 eventreadtimeout = false;
490 fatalerror = false; -- error message
491 writecallback = false; -- will be called on write events
492 readcallback = false; -- will be called on read events
493 nointerface = true; -- lock/unlock parameter of this interface
494 noreading = false, nowriting = false; -- locks of the read/writecallback
495 startsslcallback = false; -- starting handshake callback
496 position = false; -- position of client in interfacelist
499 _ip = ip, _port = port, _server = server, _pattern = pattern,
500 _serverport = (server and server:port() or nil),
501 _sslctx = sslctx; -- parameters
502 _usingssl = false; -- client is using ssl;
504 if not ssl then interface.starttls = false; end
505 interface.id = tostring(interface):match("%x+$");
506 interface.writecallback = function( event ) -- called on write events
507 --vdebug( "new client write event, id/ip/port:", interface, ip, port )
508 if interface.nowriting or ( interface.fatalerror and ( "client to close" ~= interface.fatalerror ) ) then -- leave this event
509 --vdebug( "leaving this event because:", interface.nowriting or interface.fatalerror )
510 interface.eventwrite = false
513 if EV_TIMEOUT == event then -- took too long to write some data to socket -> disconnect
514 interface.fatalerror = "timeout during writing"
515 debug( "writing failed:", interface.fatalerror )
517 interface.eventwrite = false
520 if interface._usingssl then -- handle luasec
521 if interface.eventreadtimeout then -- we have to read first
522 local ret = interface.readcallback( ) -- call readcallback
523 --vdebug( "tried to read in writecallback, result:", ret )
525 if interface.eventwritetimeout then -- luasec only
526 interface.eventwritetimeout:close( ) -- first we have to close timeout event which where regged after a wantread error
527 interface.eventwritetimeout = false
530 local succ, err, byte = interface.conn:send( interface.writebuffer, 1, interface.writebufferlen )
531 --vdebug( "write data:", interface.writebuffer, "error:", err, "part:", byte )
532 if succ then -- writing succesful
533 interface.writebuffer = ""
534 interface.writebufferlen = 0
536 if interface.fatalerror then
537 debug "closing client after writing"
538 interface:_close() -- close interface if needed
539 elseif interface.startsslcallback then -- start ssl connection if needed
540 debug "starting ssl handshake after writing"
541 interface.eventstarthandshake = addevent( base, nil, EV_TIMEOUT, interface.startsslcallback, 0 )
542 elseif interface.eventreadtimeout then
543 return EV_WRITE, EV_TIMEOUT
545 interface.eventwrite = nil
547 elseif byte and (err == "timeout" or err == "wantwrite") then -- want write again
548 --vdebug( "writebuffer is not empty:", err )
549 interface.writebuffer = string_sub( interface.writebuffer, byte + 1, interface.writebufferlen ) -- new buffer
550 interface.writebufferlen = interface.writebufferlen - byte
551 if "wantread" == err then -- happens only with luasec
552 local callback = function( )
554 interface.eventwritetimeout = nil
557 interface.eventwritetimeout = addevent( base, nil, EV_TIMEOUT, callback, cfg.WRITE_TIMEOUT ) -- reg a new timeout event
558 debug( "wantread during write attempt, reg it in readcallback but dont know what really happens next..." )
559 -- hopefully this works with luasec; its simply not possible to use 2 different write events on a socket in luaevent
562 return EV_WRITE, cfg.WRITE_TIMEOUT
563 else -- connection was closed during writing or fatal error
564 interface.fatalerror = err or "fatal error"
565 debug( "connection failed in write event:", interface.fatalerror )
567 interface.eventwrite = nil
573 interface.readcallback = function( event ) -- called on read events
574 --vdebug( "new client read event, id/ip/port:", tostring(interface.id), tostring(ip), tostring(port) )
575 if interface.noreading or interface.fatalerror then -- leave this event
576 --vdebug( "leaving this event because:", tostring(interface.noreading or interface.fatalerror) )
577 interface.eventread = nil
580 if EV_TIMEOUT == event then -- took too long to get some data from client -> disconnect
581 interface.fatalerror = "timeout during receiving"
582 debug( "connection failed:", interface.fatalerror )
584 interface.eventread = nil
587 if interface._usingssl then -- handle luasec
588 if interface.eventwritetimeout then -- ok, in the past writecallback was regged
589 local ret = interface.writecallback( ) -- call it
590 --vdebug( "tried to write in readcallback, result:", tostring(ret) )
592 if interface.eventreadtimeout then
593 interface.eventreadtimeout:close( )
594 interface.eventreadtimeout = nil
597 local buffer, err, part = interface.conn:receive( interface._pattern ) -- receive buffer with "pattern"
598 --vdebug( "read data:", tostring(buffer), "error:", tostring(err), "part:", tostring(part) )
599 buffer = buffer or part
600 if buffer and #buffer > cfg.MAX_READ_LENGTH then -- check buffer length
601 interface.fatalerror = "receive buffer exceeded"
602 debug( "fatal error:", interface.fatalerror )
604 interface.eventread = nil
607 if err and ( err ~= "timeout" and err ~= "wantread" ) then
608 if "wantwrite" == err then -- need to read on write event
609 if not interface.eventwrite then -- register new write event if needed
610 interface.eventwrite = addevent( base, interface.conn, EV_WRITE, interface.writecallback, cfg.WRITE_TIMEOUT )
612 interface.eventreadtimeout = addevent( base, nil, EV_TIMEOUT,
615 end, cfg.READ_TIMEOUT
617 debug( "wantwrite during read attempt, reg it in writecallback but dont know what really happens next..." )
618 -- to be honest i dont know what happens next, if it is allowed to first read, the write etc...
619 else -- connection was closed or fatal error
620 interface.fatalerror = err
621 debug( "connection failed in read event:", interface.fatalerror )
623 interface.eventread = nil
627 interface.onincoming( interface, buffer, err ) -- send new data to listener
629 if interface.noreading then
630 interface.eventread = nil;
633 return EV_READ, cfg.READ_TIMEOUT
637 client:settimeout( 0 ) -- set non blocking
638 setmetatable(interface, interface_mt)
639 interfacelist( "add", interface ) -- add to interfacelist
646 function handleserver( server, addr, port, pattern, listener, sslctx ) -- creates an server interface
647 debug "creating server interface..."
652 onconnect = listener.onconnect; -- will be called when new client connected
653 eventread = false; -- read event handler
654 eventclose = false; -- close event handler
655 readcallback = false; -- read event callback
656 fatalerror = false; -- error message
657 nointerface = true; -- lock/unlock parameter
659 _ip = addr, _port = port, _pattern = pattern,
662 interface.id = tostring(interface):match("%x+$");
663 interface.readcallback = function( event ) -- server handler, called on incoming connections
664 --vdebug( "server can accept, id/addr/port:", interface, addr, port )
665 if interface.fatalerror then
666 --vdebug( "leaving this event because:", self.fatalerror )
667 interface.eventread = nil
670 local delay = cfg.ACCEPT_DELAY
671 if EV_TIMEOUT == event then
672 if interface._connections >= cfg.MAX_CONNECTIONS then -- check connection count
673 debug( "to many connections, seconds to wait for next accept:", delay )
674 return EV_TIMEOUT, delay -- timeout...
676 return EV_READ -- accept again
679 --vdebug("max connection check ok, accepting...")
680 local client, err = server:accept() -- try to accept; TODO: check err
682 if interface._connections >= cfg.MAX_CONNECTIONS then
683 client:close( ) -- refuse connection
684 debug( "maximal connections reached, refuse client connection; accept delay:", delay )
685 return EV_TIMEOUT, delay -- delay for next accept attempt
687 local client_ip, client_port = client:getpeername( )
688 interface._connections = interface._connections + 1 -- increase connection count
689 local clientinterface = handleclient( client, client_ip, client_port, interface, pattern, listener, sslctx )
690 --vdebug( "client id:", clientinterface, "startssl:", startssl )
691 if ssl and sslctx then
692 clientinterface:starttls(sslctx, true)
694 clientinterface:_start_session( true )
696 debug( "accepted incoming client connection from:", client_ip or "<unknown IP>", client_port or "<unknown port>", "to", port or "<unknown port>");
698 client, err = server:accept() -- try to accept again
703 server:settimeout( 0 )
704 setmetatable(interface, interface_mt)
705 interfacelist( "add", interface )
706 interface:_start_session()
711 local addserver = ( function( )
712 return function( addr, port, listener, pattern, sslcfg, startssl ) -- TODO: check arguments
713 --vdebug( "creating new tcp server with following parameters:", addr or "nil", port or "nil", sslcfg or "nil", startssl or "nil")
714 local server, err = socket.bind( addr, port, cfg.ACCEPT_QUEUE ) -- create server socket
716 debug( "creating server socket on "..addr.." port "..port.." failed:", err )
722 debug "fatal error: luasec not found"
723 return nil, "luasec not found"
727 debug( "error while creating new ssl context for server socket:", err )
731 local interface = handleserver( server, addr, port, pattern, listener, sslctx, startssl ) -- new server handler
732 debug( "new server created with id:", tostring(interface))
737 local addclient, wrapclient
739 function wrapclient( client, ip, port, listeners, pattern, sslctx )
740 local interface = handleclient( client, ip, port, nil, pattern, listeners, sslctx )
741 interface:_start_connection(sslctx)
742 return interface, client
743 --function handleclient( client, ip, port, server, pattern, listener, _, sslctx ) -- creates an client interface
746 function addclient( addr, serverport, listener, pattern, localaddr, localport, sslcfg, startssl )
747 local client, err = socket.tcp() -- creating new socket
749 debug( "cannot create socket:", err )
752 client:settimeout( 0 ) -- set nonblocking
754 local res, err = client:bind( localaddr, localport, -1 )
756 debug( "cannot bind client:", err )
761 if sslcfg then -- handle ssl/new context
763 debug "need luasec, but not available"
764 return nil, "luasec not found"
768 debug( "cannot create new ssl context:", err )
772 local res, err = client:connect( addr, serverport ) -- connect
773 if res or ( err == "timeout" ) then
774 local ip, port = client:getsockname( )
775 local interface = wrapclient( client, ip, serverport, listener, pattern, sslctx, startssl )
776 interface:_start_connection( startssl )
777 debug( "new connection id:", interface.id )
778 return interface, err
780 debug( "new connection failed:", err )
787 local loop = function( ) -- starts the event loop
792 local newevent = ( function( )
793 local add = base.addevent
794 return function( ... )
795 return add( base, ... )
799 local closeallservers = function( arg )
800 for _, item in ipairs( interfacelist( ) ) do
801 if item.type == "server" then
807 local function setquitting(yes)
815 local function get_backend()
816 return base:method();
819 -- We need to hold onto the events to stop them
820 -- being garbage-collected
821 local signal_events = {}; -- [signal_num] -> event object
822 local function hook_signal(signal_num, handler)
823 local function _handler(event)
824 local ret = handler();
825 if ret ~= false then -- Continue handling this signal?
826 return EV_SIGNAL; -- Yes
828 return -1; -- Close this event
830 signal_events[signal_num] = base:addevent(signal_num, EV_SIGNAL, _handler);
831 return signal_events[signal_num];
834 local function link(sender, receiver, buffersize)
837 function receiver:ondrain()
838 if sender_locked then
844 function sender:onincoming(data)
845 receiver:write(data);
846 if receiver.writebufferlen >= buffersize then
847 sender_locked = true;
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,