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_ATTEMPS = 10, -- attemps to finish ssl handshake
24 HANDSHAKE_TIMEOUT = 1, -- timout in seconds per handshake attemp
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 attemp of a full server to accept
28 READ_TIMEOUT = 60 * 30, -- timeout in seconds for read data from socket
29 WRITE_TIMEOUT = 30, -- timeout in seconds for write data on socket
30 CONNECT_TIMEOUT = 10, -- timeout in seconds for connection attemps
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 print = use "print"
37 local pcall = use "pcall"
38 local ipairs = use "ipairs"
39 local string = use "string"
40 local select = use "select"
41 local require = use "require"
42 local tostring = use "tostring"
43 local coroutine = use "coroutine"
44 local setmetatable = use "setmetatable"
47 local socket = use "socket" or require "socket"
49 local log = require ("util.logger").init("socket")
51 local function debug(...)
52 return log("debug", ("%s "):rep(select('#', ...)), ...)
56 local bitor = ( function( ) -- thx Rici Lake
57 local hasbit = function( x, p )
58 return x % ( p + p ) >= p
60 return function( x, y )
63 local limit = x > y and x or y
65 if hasbit( x, p ) or hasbit( y, p ) then
74 local event = require "luaevent.core"
75 local base = event.new( )
76 local EV_READ = event.EV_READ
77 local EV_WRITE = event.EV_WRITE
78 local EV_TIMEOUT = event.EV_TIMEOUT
79 local EV_SIGNAL = event.EV_SIGNAL
81 local EV_READWRITE = bitor( EV_READ, EV_WRITE )
83 local interfacelist = ( function( ) -- holds the interfaces for sockets
86 return function( method, arg )
87 if "add" == method then
92 elseif "delete" == method then
94 return nil, "array is already empty"
96 local position = arg:_position() -- get position in array
97 if position ~= len then
98 local interface = array[ len ] -- get last interface
99 array[ position ] = interface -- copy it into free position
100 array[ len ] = nil -- free last position
101 interface:_position( position ) -- set new position in array
102 else -- free last position
113 -- Client interface methods
116 interface_mt = {}; interface_mt.__index = interface_mt;
118 local addevent = base.addevent
119 local coroutine_wrap, coroutine_yield = coroutine.wrap,coroutine.yield
120 local string_len = string.len
123 function interface_mt:_position(new_position)
124 self.position = new_position or self.position
125 return self.position;
127 function interface_mt:_close() -- regs event to start self:_destroy()
128 local callback = function( )
130 self.eventclose = nil
133 self.eventclose = addevent( base, nil, EV_TIMEOUT, callback, 0 )
137 function interface_mt:_start_connection(plainssl) -- should be called from addclient
138 local callback = function( event )
139 if EV_TIMEOUT == event then -- timout during connection
140 self.fatalerror = "connection timeout"
141 self:ontimeout() -- call timeout listener
143 debug( "new connection failed. id:", self.id, "error:", self.fatalerror )
145 if plainssl and ssl then -- start ssl session
147 else -- normal connection
148 self:_start_session( self.listener.onconnect )
150 debug( "new connection established. id:", self.id )
152 self.eventconnect = nil
155 self.eventconnect = addevent( base, self.conn, EV_WRITE, callback, cfg.CONNECT_TIMEOUT )
158 function interface_mt:_start_session(onconnect) -- new session, for example after startssl
159 if self.type == "client" then
160 local callback = function( )
161 self:_lock( false, false, false )
162 --vdebug( "start listening on client socket with id:", self.id )
163 self.eventread = addevent( base, self.conn, EV_READ, self.readcallback, cfg.READ_TIMEOUT ) -- register callback
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(arg) -- 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 "onconnect" == arg 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_ATTEMPS
200 while attempt < 1000 do -- no endless loop
201 attempt = attempt + 1
202 debug( "ssl handshake of client with id:"..tostring(self).."attemp:"..attempt )
203 if attempt > maxattempt then
204 self.fatalerror = "max handshake attemps 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
214 if "onconnect" == arg then -- trigger listener
215 onsomething = self.onconnect
217 onsomething = self.onsslconnection
219 self:_start_session( onsomething )
220 debug( "ssl handshake done" )
221 self:onstatus("ssl-handshake-complete");
222 self.eventhandshake = nil
225 debug( "error during ssl handshake:", err )
226 if err == "wantwrite" then
228 elseif err == "wantread" then
231 self.fatalerror = err
234 if self.fatalerror then
235 if "onconnect" == arg then
236 self.ondisconnect = nil -- dont call this when client isnt really connected
239 debug( "handshake failed because:", self.fatalerror )
240 self.eventhandshake = nil
243 event = coroutine_yield( event, cfg.HANDSHAKE_TIMEOUT ) -- yield this monster...
247 debug "starting handshake..."
248 self:_lock( false, true, true ) -- unlock read/write events, but keep interface locked
249 self.eventhandshake = addevent( base, self.conn, EV_READWRITE, handshakecallback, cfg.HANDSHAKE_TIMEOUT )
252 function interface_mt:_destroy() -- close this interface + events and call last listener
253 debug( "closing client with id:", self.id )
254 self:_lock( true, true, true ) -- first of all, lock the interface to avoid further actions
256 _ = self.eventread and self.eventread:close( ) -- close events; this must be called outside of the event callbacks!
257 if self.type == "client" then
258 _ = self.eventwrite and self.eventwrite:close( )
259 _ = self.eventhandshake and self.eventhandshake:close( )
260 _ = self.eventstarthandshake and self.eventstarthandshake:close( )
261 _ = self.eventconnect and self.eventconnect:close( )
262 _ = self.eventsession and self.eventsession:close( )
263 _ = self.eventwritetimeout and self.eventwritetimeout:close( )
264 _ = self.eventreadtimeout and self.eventreadtimeout:close( )
265 _ = self.ondisconnect and self:ondisconnect( self.fatalerror ) -- call ondisconnect listener (wont be the case if handshake failed on connect)
266 _ = self.conn and self.conn:close( ) -- close connection, must also be called outside of any socket registered events!
267 _ = self._server and self._server:counter(-1);
268 self.eventread, self.eventwrite = nil, nil
269 self.eventstarthandshake, self.eventhandshake, self.eventclose = nil, nil, nil
270 self.readcallback, self.writecallback = nil, nil
273 self.eventread, self.eventclose = nil, nil
274 self.interface, self.readcallback = nil, nil
276 interfacelist( "delete", self )
280 function interface_mt:_lock(nointerface, noreading, nowriting) -- lock or unlock this interface or events
281 self.nointerface, self.noreading, self.nowriting = nointerface, noreading, nowriting
282 return nointerface, noreading, nowriting
285 function interface_mt:counter(c)
287 self._connections = self._connections + c
289 return self._connections
293 function interface_mt:write(data)
294 if self.nowriting then return nil, "locked" end
295 --vdebug( "try to send data to client, id/data:", self.id, data )
296 data = tostring( data )
297 local len = string_len( data )
298 local total = len + self.writebufferlen
299 if total > cfg.MAX_SEND_LENGTH then -- check buffer length
300 local err = "send buffer exceeded"
301 debug( "error:", err ) -- to much, check your app
304 self.writebuffer = self.writebuffer .. data -- new buffer
305 self.writebufferlen = total
306 if not self.eventwrite then -- register new write event
307 --vdebug( "register new write event" )
308 self.eventwrite = addevent( base, self.conn, EV_WRITE, self.writecallback, cfg.WRITE_TIMEOUT )
312 function interface_mt:close(now)
313 if self.nointerface then return nil, "locked"; end
314 debug( "try to close client connection with id:", self.id )
315 if self.type == "client" then
316 self.fatalerror = "client to close"
317 if ( not self.eventwrite ) or now then -- try to close immediately
318 self:_lock( true, true, true )
321 else -- wait for incomplete write request
322 self:_lock( true, true, false )
323 debug "closing delayed until writebuffer is empty"
324 return nil, "writebuffer not empty, waiting"
327 debug( "try to close server with id:", self.id, "args:", now )
328 self.fatalerror = "server to close"
331 for _, item in ipairs( interfacelist( ) ) do
332 if ( item.type ~= "server" ) and ( item._server == self ) then -- client/server match
333 if item:close( now ) then -- writebuffer was empty
338 local timeout = 0 -- dont wait for unfinished writebuffers of clients...
340 timeout = cfg.WRITE_TIMEOUT -- ...or wait for it
342 self:_close( timeout ) -- add new event to remove the server interface
343 debug( "seconds remained until server is closed:", timeout )
344 return count -- returns finished clients with empty writebuffer
348 function interface_mt:server()
349 return self._server or self;
352 function interface_mt:port()
356 function interface_mt:serverport()
357 return self._serverport
360 function interface_mt:ip()
364 function interface_mt:ssl()
365 return self._usingssl
368 function interface_mt:type()
369 return self._type or "client"
372 function interface_mt:connections()
373 return self._connections
376 function interface_mt:address()
380 function interface_mt:set_sslctx(sslctx)
381 self._sslctx = sslctx;
383 self.starttls = nil; -- use starttls() of interface_mt
385 self.starttls = false; -- prevent starttls()
389 function interface_mt:set_send(new_send)
390 -- No-op, we always use the underlying connection's send
393 function interface_mt:starttls(sslctx)
394 debug( "try to start ssl at client id:", self.id )
396 self._sslctx = sslctx;
397 if self._usingssl then -- startssl was already called
398 err = "ssl already active"
401 debug( "error:", err )
404 self._usingssl = true
405 self.startsslcallback = function( ) -- we have to start the handshake outside of a read/write event
406 self.startsslcallback = nil
408 self.eventstarthandshake = nil
411 if not self.eventwrite then
412 self:_lock( true, true, true ) -- lock the interface, to not disturb the handshake
413 self.eventstarthandshake = addevent( base, nil, EV_TIMEOUT, self.startsslcallback, 0 ) -- add event to start handshake
414 else -- wait until writebuffer is empty
415 self:_lock( true, true, false )
416 debug "ssl session delayed until writebuffer is empty..."
418 self.starttls = false;
422 function interface_mt:setoption(option, value)
423 if self.conn.setoption then
424 return self.conn:setoption(option, value);
426 return false, "setoption not implemented";
429 function interface_mt:setlistener(listener)
430 self.onconnect, self.ondisconnect, self.onincoming, self.ontimeout, self.onstatus
431 = listener.onconnect, listener.ondisconnect, listener.onincoming, listener.ontimeout, listener.onstatus;
435 function interface_mt:onconnect()
437 function interface_mt:onincoming()
439 function interface_mt:ondisconnect()
441 function interface_mt:ontimeout()
443 function interface_mt:onstatus()
444 debug("server.lua: Dummy onstatus()")
448 -- End of client interface methods
452 local string_sub = string.sub -- caching table lookups
453 local string_len = string.len
454 local addevent = base.addevent
455 local coroutine_wrap = coroutine.wrap
456 local socket_gettime = socket.gettime
457 local coroutine_yield = coroutine.yield
458 function handleclient( client, ip, port, server, pattern, listener, _, sslctx ) -- creates an client interface
459 --vdebug("creating client interfacce...")
463 currenttime = socket_gettime( ); -- safe the origin
464 writebuffer = ""; -- writebuffer
465 writebufferlen = 0; -- length of writebuffer
466 send = client.send; -- caching table lookups
467 receive = client.receive;
468 onconnect = listener.onconnect; -- will be called when client disconnects
469 ondisconnect = listener.ondisconnect; -- will be called when client disconnects
470 onincoming = listener.onincoming; -- will be called when client sends data
471 ontimeout = listener.ontimeout; -- called when fatal socket timeout occurs
472 onstatus = listener.onstatus; -- called for status changes (e.g. of SSL/TLS)
473 eventread = false, eventwrite = false, eventclose = false,
474 eventhandshake = false, eventstarthandshake = false; -- event handler
475 eventconnect = false, eventsession = false; -- more event handler...
476 eventwritetimeout = false; -- even more event handler...
477 eventreadtimeout = false;
478 fatalerror = false; -- error message
479 writecallback = false; -- will be called on write events
480 readcallback = false; -- will be called on read events
481 nointerface = true; -- lock/unlock parameter of this interface
482 noreading = false, nowriting = false; -- locks of the read/writecallback
483 startsslcallback = false; -- starting handshake callback
484 position = false; -- position of client in interfacelist
487 _ip = ip, _port = port, _server = server, _pattern = pattern,
488 _serverport = (server and server:port() or nil),
489 _sslctx = sslctx; -- parameters
490 _usingssl = false; -- client is using ssl;
492 if not ssl then interface.starttls = false; end
493 interface.id = tostring(interface):match("%x+$");
494 interface.writecallback = function( event ) -- called on write events
495 --vdebug( "new client write event, id/ip/port:", interface, ip, port )
496 if interface.nowriting or ( interface.fatalerror and ( "client to close" ~= interface.fatalerror ) ) then -- leave this event
497 --vdebug( "leaving this event because:", interface.nowriting or interface.fatalerror )
498 interface.eventwrite = false
501 if EV_TIMEOUT == event then -- took too long to write some data to socket -> disconnect
502 interface.fatalerror = "timeout during writing"
503 debug( "writing failed:", interface.fatalerror )
505 interface.eventwrite = false
508 if interface._usingssl then -- handle luasec
509 if interface.eventreadtimeout then -- we have to read first
510 local ret = interface.readcallback( ) -- call readcallback
511 --vdebug( "tried to read in writecallback, result:", ret )
513 if interface.eventwritetimeout then -- luasec only
514 interface.eventwritetimeout:close( ) -- first we have to close timeout event which where regged after a wantread error
515 interface.eventwritetimeout = false
518 local succ, err, byte = interface.conn:send( interface.writebuffer, 1, interface.writebufferlen )
519 --vdebug( "write data:", interface.writebuffer, "error:", err, "part:", byte )
520 if succ then -- writing succesful
521 interface.writebuffer = ""
522 interface.writebufferlen = 0
523 if interface.fatalerror then
524 debug "closing client after writing"
525 interface:_close() -- close interface if needed
526 elseif interface.startsslcallback then -- start ssl connection if needed
527 debug "starting ssl handshake after writing"
528 interface.eventstarthandshake = addevent( base, nil, EV_TIMEOUT, interface.startsslcallback, 0 )
529 elseif interface.eventreadtimeout then
530 return EV_WRITE, EV_TIMEOUT
532 interface.eventwrite = nil
534 elseif byte then -- want write again
535 --vdebug( "writebuffer is not empty:", err )
536 interface.writebuffer = string_sub( interface.writebuffer, byte + 1, interface.writebufferlen ) -- new buffer
537 interface.writebufferlen = interface.writebufferlen - byte
538 if "wantread" == err then -- happens only with luasec
539 local callback = function( )
541 interface.eventwritetimeout = nil
542 return evreturn, evtimeout
544 interface.eventwritetimeout = addevent( base, nil, EV_TIMEOUT, callback, cfg.WRITE_TIMEOUT ) -- reg a new timeout event
545 debug( "wantread during write attemp, reg it in readcallback but dont know what really happens next..." )
546 -- hopefully this works with luasec; its simply not possible to use 2 different write events on a socket in luaevent
549 return EV_WRITE, cfg.WRITE_TIMEOUT
550 else -- connection was closed during writing or fatal error
551 interface.fatalerror = err or "fatal error"
552 debug( "connection failed in write event:", interface.fatalerror )
554 interface.eventwrite = nil
560 interface.readcallback = function( event ) -- called on read events
561 --vdebug( "new client read event, id/ip/port:", tostring(interface.id), tostring(ip), tostring(port) )
562 if interface.noreading or interface.fatalerror then -- leave this event
563 --vdebug( "leaving this event because:", tostring(interface.noreading or interface.fatalerror) )
564 interface.eventread = nil
567 if EV_TIMEOUT == event then -- took too long to get some data from client -> disconnect
568 interface.fatalerror = "timeout during receiving"
569 debug( "connection failed:", interface.fatalerror )
571 interface.eventread = nil
574 if interface._usingssl then -- handle luasec
575 if interface.eventwritetimeout then -- ok, in the past writecallback was regged
576 local ret = interface.writecallback( ) -- call it
577 --vdebug( "tried to write in readcallback, result:", tostring(ret) )
579 if interface.eventreadtimeout then
580 interface.eventreadtimeout:close( )
581 interface.eventreadtimeout = nil
584 local buffer, err, part = interface.conn:receive( pattern ) -- receive buffer with "pattern"
585 --vdebug( "read data:", tostring(buffer), "error:", tostring(err), "part:", tostring(part) )
586 buffer = buffer or part or ""
587 local len = string_len( buffer )
588 if len > cfg.MAX_READ_LENGTH then -- check buffer length
589 interface.fatalerror = "receive buffer exceeded"
590 debug( "fatal error:", interface.fatalerror )
592 interface.eventread = nil
595 interface.onincoming( interface, buffer, err ) -- send new data to listener
596 if err and ( err ~= "timeout" and err ~= "wantread" ) then
597 if "wantwrite" == err then -- need to read on write event
598 if not interface.eventwrite then -- register new write event if needed
599 interface.eventwrite = addevent( base, interface.conn, EV_WRITE, interface.writecallback, cfg.WRITE_TIMEOUT )
601 interface.eventreadtimeout = addevent( base, nil, EV_TIMEOUT,
604 end, cfg.READ_TIMEOUT
606 debug( "wantwrite during read attemp, reg it in writecallback but dont know what really happens next..." )
607 -- to be honest i dont know what happens next, if it is allowed to first read, the write etc...
608 else -- connection was closed or fatal error
609 interface.fatalerror = err
610 debug( "connection failed in read event:", interface.fatalerror )
612 interface.eventread = nil
616 return EV_READ, cfg.READ_TIMEOUT
620 client:settimeout( 0 ) -- set non blocking
621 setmetatable(interface, interface_mt)
622 interfacelist( "add", interface ) -- add to interfacelist
629 function handleserver( server, addr, port, pattern, listener, sslctx ) -- creates an server interface
630 debug "creating server interface..."
635 onconnect = listener.onconnect; -- will be called when new client connected
636 eventread = false; -- read event handler
637 eventclose = false; -- close event handler
638 readcallback = false; -- read event callback
639 fatalerror = false; -- error message
640 nointerface = true; -- lock/unlock parameter
642 _ip = addr, _port = port, _pattern = pattern,
645 interface.id = tostring(interface):match("%x+$");
646 interface.readcallback = function( event ) -- server handler, called on incoming connections
647 --vdebug( "server can accept, id/addr/port:", interface, addr, port )
648 if interface.fatalerror then
649 --vdebug( "leaving this event because:", self.fatalerror )
650 interface.eventread = nil
653 local delay = cfg.ACCEPT_DELAY
654 if EV_TIMEOUT == event then
655 if interface._connections >= cfg.MAX_CONNECTIONS then -- check connection count
656 debug( "to many connections, seconds to wait for next accept:", delay )
657 return EV_TIMEOUT, delay -- timeout...
659 return EV_READ -- accept again
662 --vdebug("max connection check ok, accepting...")
663 local client, err = server:accept() -- try to accept; TODO: check err
665 if interface._connections >= cfg.MAX_CONNECTIONS then
666 client:close( ) -- refuse connection
667 debug( "maximal connections reached, refuse client connection; accept delay:", delay )
668 return EV_TIMEOUT, delay -- delay for next accept attemp
670 local ip, port = client:getpeername( )
671 interface._connections = interface._connections + 1 -- increase connection count
672 local clientinterface = handleclient( client, ip, port, interface, pattern, listener, nil, sslctx )
673 --vdebug( "client id:", clientinterface, "startssl:", startssl )
674 if ssl and sslctx then
675 clientinterface:starttls(sslctx)
677 clientinterface:_start_session( clientinterface.onconnect )
679 debug( "accepted incoming client connection from:", ip, port )
680 client, err = server:accept() -- try to accept again
685 server:settimeout( 0 )
686 setmetatable(interface, interface_mt)
687 interfacelist( "add", interface )
688 interface:_start_session()
693 local addserver = ( function( )
694 return function( addr, port, listener, pattern, sslcfg, startssl ) -- TODO: check arguments
695 --vdebug( "creating new tcp server with following parameters:", addr or "nil", port or "nil", sslcfg or "nil", startssl or "nil")
696 local server, err = socket.bind( addr, port, cfg.ACCEPT_QUEUE ) -- create server socket
698 debug( "creating server socket failed because:", err )
704 debug "fatal error: luasec not found"
705 return nil, "luasec not found"
709 debug( "error while creating new ssl context for server socket:", err )
713 local interface = handleserver( server, addr, port, pattern, listener, sslctx, startssl ) -- new server handler
714 debug( "new server created with id:", tostring(interface))
719 local addclient, wrapclient
721 function wrapclient( client, ip, port, listeners, pattern, sslctx, startssl )
722 local interface = handleclient( client, ip, port, nil, pattern, listeners, sslctx )
723 interface:_start_session()
725 --function handleclient( client, ip, port, server, pattern, listener, _, sslctx ) -- creates an client interface
728 function addclient( addr, serverport, listener, pattern, localaddr, localport, sslcfg, startssl )
729 local client, err = socket.tcp() -- creating new socket
731 debug( "cannot create socket:", err )
734 client:settimeout( 0 ) -- set nonblocking
736 local res, err = client:bind( localaddr, localport, -1 )
738 debug( "cannot bind client:", err )
743 if sslcfg then -- handle ssl/new context
745 debug "need luasec, but not available"
746 return nil, "luasec not found"
748 sslctx, err = ssl.newcontext( sslcfg )
750 debug( "cannot create new ssl context:", err )
754 local res, err = client:connect( addr, serverport ) -- connect
755 if res or ( err == "timeout" ) then
756 local ip, port = client:getsockname( )
757 local server = function( )
758 return nil, "this is a dummy server interface"
760 local interface = wrapclient( client, ip, serverport, listeners, pattern, sslctx, startssl )
761 interface:_start_connection( startssl )
762 debug( "new connection id:", interface.id )
763 return interface, err
765 debug( "new connection failed:", err )
772 local loop = function( ) -- starts the event loop
777 local newevent = ( function( )
778 local add = base.addevent
779 return function( ... )
780 return add( base, ... )
784 local closeallservers = function( arg )
785 for _, item in ipairs( interfacelist( ) ) do
786 if item.type == "server" then
792 local function setquitting(yes)
800 function get_backend()
801 return base:method();
804 -- We need to hold onto the events to stop them
805 -- being garbage-collected
806 local signal_events = {}; -- [signal_num] -> event object
807 function hook_signal(signal_num, handler)
808 local function _handler(event)
809 local ret = handler();
810 if ret ~= false then -- Continue handling this signal?
811 return EV_SIGNAL; -- Yes
813 return -1; -- Close this event
815 signal_events[signal_num] = base:addevent(signal_num, EV_SIGNAL, _handler);
816 return signal_events[signal_num];
827 addserver = addserver,
828 addclient = addclient,
829 wrapclient = wrapclient,
830 setquitting = setquitting,
831 closeall = closeallservers,
832 get_backend = get_backend,
833 hook_signal = hook_signal,
835 __NAME = SCRIPT_NAME,
836 __DATE = LAST_MODIFIED,
837 __AUTHOR = SCRIPT_AUTHOR,
838 __VERSION = SCRIPT_VERSION,