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 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 -- timeout 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
146 self:starttls(nil, true)
147 else -- normal connection
148 self:_start_session(true)
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(call_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
164 if call_onconnect then
167 self.eventsession = nil
170 self.eventsession = addevent( base, nil, EV_TIMEOUT, callback, 0 )
173 --vdebug( "start listening on server socket with id:", self.id )
174 self.eventread = addevent( base, self.conn, EV_READ, self.readcallback ) -- register callback
178 function interface_mt:_start_ssl(call_onconnect) -- old socket will be destroyed, therefore we have to close read/write events first
179 --vdebug( "starting ssl session with client id:", self.id )
181 _ = self.eventread and self.eventread:close( ) -- close events; this must be called outside of the event callbacks!
182 _ = self.eventwrite and self.eventwrite:close( )
183 self.eventread, self.eventwrite = nil, nil
185 self.conn, err = ssl.wrap( self.conn, self._sslctx )
187 self.fatalerror = err
188 self.conn = nil -- cannot be used anymore
189 if call_onconnect then
190 self.ondisconnect = nil -- dont call this when client isnt really connected
193 debug( "fatal error while ssl wrapping:", err )
196 self.conn:settimeout( 0 ) -- set non blocking
197 local handshakecallback = coroutine_wrap(
201 local maxattempt = cfg.MAX_HANDSHAKE_ATTEMPTS
202 while attempt < maxattempt do -- no endless loop
203 attempt = attempt + 1
204 debug( "ssl handshake of client with id:"..tostring(self)..", attempt:"..attempt )
205 if attempt > maxattempt then
206 self.fatalerror = "max handshake attempts exceeded"
207 elseif EV_TIMEOUT == event then
208 self.fatalerror = "timeout during handshake"
210 _, err = self.conn:dohandshake( )
212 self:_lock( false, false, false ) -- unlock the interface; sending, closing etc allowed
213 self.send = self.conn.send -- caching table lookups with new client object
214 self.receive = self.conn.receive
216 if not call_onconnect then -- trigger listener
217 self:onstatus("ssl-handshake-complete");
219 self:_start_session( call_onconnect )
220 debug( "ssl handshake done" )
221 self.eventhandshake = nil
224 debug( "error during ssl handshake:", err )
225 if err == "wantwrite" then
227 elseif err == "wantread" then
230 self.fatalerror = err
233 if self.fatalerror then
234 if call_onconnect then
235 self.ondisconnect = nil -- dont call this when client isnt really connected
238 debug( "handshake failed because:", self.fatalerror )
239 self.eventhandshake = nil
242 event = coroutine_yield( event, cfg.HANDSHAKE_TIMEOUT ) -- yield this monster...
246 debug "starting handshake..."
247 self:_lock( false, true, true ) -- unlock read/write events, but keep interface locked
248 self.eventhandshake = addevent( base, self.conn, EV_READWRITE, handshakecallback, cfg.HANDSHAKE_TIMEOUT )
251 function interface_mt:_destroy() -- close this interface + events and call last listener
252 debug( "closing client with id:", self.id )
253 self:_lock( true, true, true ) -- first of all, lock the interface to avoid further actions
255 _ = self.eventread and self.eventread:close( ) -- close events; this must be called outside of the event callbacks!
256 if self.type == "client" then
257 _ = self.eventwrite and self.eventwrite:close( )
258 _ = self.eventhandshake and self.eventhandshake:close( )
259 _ = self.eventstarthandshake and self.eventstarthandshake:close( )
260 _ = self.eventconnect and self.eventconnect:close( )
261 _ = self.eventsession and self.eventsession:close( )
262 _ = self.eventwritetimeout and self.eventwritetimeout:close( )
263 _ = self.eventreadtimeout and self.eventreadtimeout:close( )
264 _ = 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)
265 _ = self.conn and self.conn:close( ) -- close connection, must also be called outside of any socket registered events!
266 _ = self._server and self._server:counter(-1);
267 self.eventread, self.eventwrite = nil, nil
268 self.eventstarthandshake, self.eventhandshake, self.eventclose = nil, nil, nil
269 self.readcallback, self.writecallback = nil, nil
272 self.eventread, self.eventclose = nil, nil
273 self.interface, self.readcallback = nil, nil
275 interfacelist( "delete", self )
279 function interface_mt:_lock(nointerface, noreading, nowriting) -- lock or unlock this interface or events
280 self.nointerface, self.noreading, self.nowriting = nointerface, noreading, nowriting
281 return nointerface, noreading, nowriting
285 function interface_mt:lock_read(switch)
289 return self:resume();
293 function interface_mt:pause()
294 return self:_lock(self.nointerface, true, self.nowriting);
297 function interface_mt:resume()
298 return self:_lock(self.nointerface, false, self.nowriting);
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(now)
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 ( not self.eventwrite ) or now then -- try to close immediately
334 self:_lock( true, true, true )
337 else -- wait for incomplete write request
338 self:_lock( true, true, false )
339 debug "closing delayed until writebuffer is empty"
340 return nil, "writebuffer not empty, waiting"
343 debug( "try to close server with id:", self.id, "args:", now )
344 self.fatalerror = "server to close"
347 for _, item in ipairs( interfacelist( ) ) do
348 if ( item.type ~= "server" ) and ( item._server == self ) then -- client/server match
349 if item:close( now ) then -- writebuffer was empty
354 local timeout = 0 -- dont wait for unfinished writebuffers of clients...
356 timeout = cfg.WRITE_TIMEOUT -- ...or wait for it
358 self:_close( timeout ) -- add new event to remove the server interface
359 debug( "seconds remained until server is closed:", timeout )
360 return count -- returns finished clients with empty writebuffer
364 function interface_mt:server()
365 return self._server or self;
368 function interface_mt:port()
372 function interface_mt:serverport()
373 return self._serverport
376 function interface_mt:ip()
380 function interface_mt:ssl()
381 return self._usingssl
384 function interface_mt:type()
385 return self._type or "client"
388 function interface_mt:connections()
389 return self._connections
392 function interface_mt:address()
396 function interface_mt:set_sslctx(sslctx)
397 self._sslctx = sslctx;
399 self.starttls = nil; -- use starttls() of interface_mt
401 self.starttls = false; -- prevent starttls()
405 function interface_mt:set_mode(pattern)
407 self._pattern = pattern;
409 return self._pattern;
412 function interface_mt:set_send(new_send)
413 -- No-op, we always use the underlying connection's send
416 function interface_mt:starttls(sslctx, call_onconnect)
417 debug( "try to start ssl at client id:", self.id )
419 self._sslctx = sslctx;
420 if self._usingssl then -- startssl was already called
421 err = "ssl already active"
424 debug( "error:", err )
427 self._usingssl = true
428 self.startsslcallback = function( ) -- we have to start the handshake outside of a read/write event
429 self.startsslcallback = nil
430 self:_start_ssl(call_onconnect);
431 self.eventstarthandshake = nil
434 if not self.eventwrite then
435 self:_lock( true, true, true ) -- lock the interface, to not disturb the handshake
436 self.eventstarthandshake = addevent( base, nil, EV_TIMEOUT, self.startsslcallback, 0 ) -- add event to start handshake
437 else -- wait until writebuffer is empty
438 self:_lock( true, true, false )
439 debug "ssl session delayed until writebuffer is empty..."
441 self.starttls = false;
445 function interface_mt:setoption(option, value)
446 if self.conn.setoption then
447 return self.conn:setoption(option, value);
449 return false, "setoption not implemented";
452 function interface_mt:setlistener(listener)
453 self.onconnect, self.ondisconnect, self.onincoming, self.ontimeout, self.onstatus
454 = listener.onconnect, listener.ondisconnect, listener.onincoming, listener.ontimeout, listener.onstatus;
458 function interface_mt:onconnect()
459 return self:onincoming(nil);
461 function interface_mt:onincoming()
463 function interface_mt:ondisconnect()
465 function interface_mt:ontimeout()
467 function interface_mt:ondrain()
469 function interface_mt:onstatus()
473 -- End of client interface methods
477 local string_sub = string.sub -- caching table lookups
478 local string_len = string.len
479 local addevent = base.addevent
480 local coroutine_wrap = coroutine.wrap
481 local socket_gettime = socket.gettime
482 local coroutine_yield = coroutine.yield
483 function handleclient( client, ip, port, server, pattern, listener, _, sslctx ) -- creates an client interface
484 --vdebug("creating client interfacce...")
488 currenttime = socket_gettime( ); -- safe the origin
489 writebuffer = ""; -- writebuffer
490 writebufferlen = 0; -- length of writebuffer
491 send = client.send; -- caching table lookups
492 receive = client.receive;
493 onconnect = listener.onconnect; -- will be called when client disconnects
494 ondisconnect = listener.ondisconnect; -- will be called when client disconnects
495 onincoming = listener.onincoming; -- will be called when client sends data
496 ontimeout = listener.ontimeout; -- called when fatal socket timeout occurs
497 onstatus = listener.onstatus; -- called for status changes (e.g. of SSL/TLS)
498 eventread = false, eventwrite = false, eventclose = false,
499 eventhandshake = false, eventstarthandshake = false; -- event handler
500 eventconnect = false, eventsession = false; -- more event handler...
501 eventwritetimeout = false; -- even more event handler...
502 eventreadtimeout = false;
503 fatalerror = false; -- error message
504 writecallback = false; -- will be called on write events
505 readcallback = false; -- will be called on read events
506 nointerface = true; -- lock/unlock parameter of this interface
507 noreading = false, nowriting = false; -- locks of the read/writecallback
508 startsslcallback = false; -- starting handshake callback
509 position = false; -- position of client in interfacelist
512 _ip = ip, _port = port, _server = server, _pattern = pattern,
513 _serverport = (server and server:port() or nil),
514 _sslctx = sslctx; -- parameters
515 _usingssl = false; -- client is using ssl;
517 if not ssl then interface.starttls = false; end
518 interface.id = tostring(interface):match("%x+$");
519 interface.writecallback = function( event ) -- called on write events
520 --vdebug( "new client write event, id/ip/port:", interface, ip, port )
521 if interface.nowriting or ( interface.fatalerror and ( "client to close" ~= interface.fatalerror ) ) then -- leave this event
522 --vdebug( "leaving this event because:", interface.nowriting or interface.fatalerror )
523 interface.eventwrite = false
526 if EV_TIMEOUT == event then -- took too long to write some data to socket -> disconnect
527 interface.fatalerror = "timeout during writing"
528 debug( "writing failed:", interface.fatalerror )
530 interface.eventwrite = false
533 if interface._usingssl then -- handle luasec
534 if interface.eventreadtimeout then -- we have to read first
535 local ret = interface.readcallback( ) -- call readcallback
536 --vdebug( "tried to read in writecallback, result:", ret )
538 if interface.eventwritetimeout then -- luasec only
539 interface.eventwritetimeout:close( ) -- first we have to close timeout event which where regged after a wantread error
540 interface.eventwritetimeout = false
543 local succ, err, byte = interface.conn:send( interface.writebuffer, 1, interface.writebufferlen )
544 --vdebug( "write data:", interface.writebuffer, "error:", err, "part:", byte )
545 if succ then -- writing succesful
546 interface.writebuffer = ""
547 interface.writebufferlen = 0
549 if interface.fatalerror then
550 debug "closing client after writing"
551 interface:_close() -- close interface if needed
552 elseif interface.startsslcallback then -- start ssl connection if needed
553 debug "starting ssl handshake after writing"
554 interface.eventstarthandshake = addevent( base, nil, EV_TIMEOUT, interface.startsslcallback, 0 )
555 elseif interface.eventreadtimeout then
556 return EV_WRITE, EV_TIMEOUT
558 interface.eventwrite = nil
560 elseif byte and (err == "timeout" or err == "wantwrite") then -- want write again
561 --vdebug( "writebuffer is not empty:", err )
562 interface.writebuffer = string_sub( interface.writebuffer, byte + 1, interface.writebufferlen ) -- new buffer
563 interface.writebufferlen = interface.writebufferlen - byte
564 if "wantread" == err then -- happens only with luasec
565 local callback = function( )
567 interface.eventwritetimeout = nil
570 interface.eventwritetimeout = addevent( base, nil, EV_TIMEOUT, callback, cfg.WRITE_TIMEOUT ) -- reg a new timeout event
571 debug( "wantread during write attempt, reg it in readcallback but dont know what really happens next..." )
572 -- hopefully this works with luasec; its simply not possible to use 2 different write events on a socket in luaevent
575 return EV_WRITE, cfg.WRITE_TIMEOUT
576 else -- connection was closed during writing or fatal error
577 interface.fatalerror = err or "fatal error"
578 debug( "connection failed in write event:", interface.fatalerror )
580 interface.eventwrite = nil
586 interface.readcallback = function( event ) -- called on read events
587 --vdebug( "new client read event, id/ip/port:", tostring(interface.id), tostring(ip), tostring(port) )
588 if interface.noreading or interface.fatalerror then -- leave this event
589 --vdebug( "leaving this event because:", tostring(interface.noreading or interface.fatalerror) )
590 interface.eventread = nil
593 if EV_TIMEOUT == event then -- took too long to get some data from client -> disconnect
594 interface.fatalerror = "timeout during receiving"
595 debug( "connection failed:", interface.fatalerror )
597 interface.eventread = nil
600 if interface._usingssl then -- handle luasec
601 if interface.eventwritetimeout then -- ok, in the past writecallback was regged
602 local ret = interface.writecallback( ) -- call it
603 --vdebug( "tried to write in readcallback, result:", tostring(ret) )
605 if interface.eventreadtimeout then
606 interface.eventreadtimeout:close( )
607 interface.eventreadtimeout = nil
610 local buffer, err, part = interface.conn:receive( interface._pattern ) -- receive buffer with "pattern"
611 --vdebug( "read data:", tostring(buffer), "error:", tostring(err), "part:", tostring(part) )
612 buffer = buffer or part or ""
613 local len = string_len( buffer )
614 if len > cfg.MAX_READ_LENGTH then -- check buffer length
615 interface.fatalerror = "receive buffer exceeded"
616 debug( "fatal error:", interface.fatalerror )
618 interface.eventread = nil
621 interface.onincoming( interface, buffer, err ) -- send new data to listener
622 if err and ( err ~= "timeout" and err ~= "wantread" ) then
623 if "wantwrite" == err then -- need to read on write event
624 if not interface.eventwrite then -- register new write event if needed
625 interface.eventwrite = addevent( base, interface.conn, EV_WRITE, interface.writecallback, cfg.WRITE_TIMEOUT )
627 interface.eventreadtimeout = addevent( base, nil, EV_TIMEOUT,
630 end, cfg.READ_TIMEOUT
632 debug( "wantwrite during read attempt, reg it in writecallback but dont know what really happens next..." )
633 -- to be honest i dont know what happens next, if it is allowed to first read, the write etc...
634 else -- connection was closed or fatal error
635 interface.fatalerror = err
636 debug( "connection failed in read event:", interface.fatalerror )
638 interface.eventread = nil
642 return EV_READ, cfg.READ_TIMEOUT
646 client:settimeout( 0 ) -- set non blocking
647 setmetatable(interface, interface_mt)
648 interfacelist( "add", interface ) -- add to interfacelist
655 function handleserver( server, addr, port, pattern, listener, sslctx ) -- creates an server interface
656 debug "creating server interface..."
661 onconnect = listener.onconnect; -- will be called when new client connected
662 eventread = false; -- read event handler
663 eventclose = false; -- close event handler
664 readcallback = false; -- read event callback
665 fatalerror = false; -- error message
666 nointerface = true; -- lock/unlock parameter
668 _ip = addr, _port = port, _pattern = pattern,
671 interface.id = tostring(interface):match("%x+$");
672 interface.readcallback = function( event ) -- server handler, called on incoming connections
673 --vdebug( "server can accept, id/addr/port:", interface, addr, port )
674 if interface.fatalerror then
675 --vdebug( "leaving this event because:", self.fatalerror )
676 interface.eventread = nil
679 local delay = cfg.ACCEPT_DELAY
680 if EV_TIMEOUT == event then
681 if interface._connections >= cfg.MAX_CONNECTIONS then -- check connection count
682 debug( "to many connections, seconds to wait for next accept:", delay )
683 return EV_TIMEOUT, delay -- timeout...
685 return EV_READ -- accept again
688 --vdebug("max connection check ok, accepting...")
689 local client, err = server:accept() -- try to accept; TODO: check err
691 if interface._connections >= cfg.MAX_CONNECTIONS then
692 client:close( ) -- refuse connection
693 debug( "maximal connections reached, refuse client connection; accept delay:", delay )
694 return EV_TIMEOUT, delay -- delay for next accept attempt
696 local client_ip, client_port = client:getpeername( )
697 interface._connections = interface._connections + 1 -- increase connection count
698 local clientinterface = handleclient( client, client_ip, client_port, interface, pattern, listener, nil, sslctx )
699 --vdebug( "client id:", clientinterface, "startssl:", startssl )
700 if ssl and sslctx then
701 clientinterface:starttls(sslctx, true)
703 clientinterface:_start_session( true )
705 debug( "accepted incoming client connection from:", client_ip or "<unknown IP>", client_port or "<unknown port>", "to", port or "<unknown port>");
707 client, err = server:accept() -- try to accept again
712 server:settimeout( 0 )
713 setmetatable(interface, interface_mt)
714 interfacelist( "add", interface )
715 interface:_start_session()
720 local addserver = ( function( )
721 return function( addr, port, listener, pattern, sslcfg, startssl ) -- TODO: check arguments
722 --vdebug( "creating new tcp server with following parameters:", addr or "nil", port or "nil", sslcfg or "nil", startssl or "nil")
723 local server, err = socket.bind( addr, port, cfg.ACCEPT_QUEUE ) -- create server socket
725 debug( "creating server socket failed because:", err )
731 debug "fatal error: luasec not found"
732 return nil, "luasec not found"
736 debug( "error while creating new ssl context for server socket:", err )
740 local interface = handleserver( server, addr, port, pattern, listener, sslctx, startssl ) -- new server handler
741 debug( "new server created with id:", tostring(interface))
746 local addclient, wrapclient
748 function wrapclient( client, ip, port, listeners, pattern, sslctx, startssl )
749 local interface = handleclient( client, ip, port, nil, pattern, listeners, sslctx )
750 interface:_start_session()
751 return interface, client
752 --function handleclient( client, ip, port, server, pattern, listener, _, sslctx ) -- creates an client interface
755 function addclient( addr, serverport, listener, pattern, localaddr, localport, sslcfg, startssl )
756 local client, err = socket.tcp() -- creating new socket
758 debug( "cannot create socket:", err )
761 client:settimeout( 0 ) -- set nonblocking
763 local res, err = client:bind( localaddr, localport, -1 )
765 debug( "cannot bind client:", err )
770 if sslcfg then -- handle ssl/new context
772 debug "need luasec, but not available"
773 return nil, "luasec not found"
777 debug( "cannot create new ssl context:", err )
781 local res, err = client:connect( addr, serverport ) -- connect
782 if res or ( err == "timeout" ) then
783 local ip, port = client:getsockname( )
784 local server = function( )
785 return nil, "this is a dummy server interface"
787 local interface = wrapclient( client, ip, serverport, listener, pattern, sslctx, startssl )
788 interface:_start_connection( startssl )
789 debug( "new connection id:", interface.id )
790 return interface, err
792 debug( "new connection failed:", err )
799 local loop = function( ) -- starts the event loop
804 local newevent = ( function( )
805 local add = base.addevent
806 return function( ... )
807 return add( base, ... )
811 local closeallservers = function( arg )
812 for _, item in ipairs( interfacelist( ) ) do
813 if item.type == "server" then
819 local function setquitting(yes)
827 function get_backend()
828 return base:method();
831 -- We need to hold onto the events to stop them
832 -- being garbage-collected
833 local signal_events = {}; -- [signal_num] -> event object
834 function hook_signal(signal_num, handler)
835 local function _handler(event)
836 local ret = handler();
837 if ret ~= false then -- Continue handling this signal?
838 return EV_SIGNAL; -- Yes
840 return -1; -- Close this event
842 signal_events[signal_num] = base:addevent(signal_num, EV_SIGNAL, _handler);
843 return signal_events[signal_num];
846 local function link(sender, receiver, buffersize)
847 sender:set_mode(buffersize);
850 function receiver:ondrain()
851 if sender_locked then
857 function sender:onincoming(data)
858 receiver:write(data);
859 if receiver.writebufferlen >= buffersize then
860 sender_locked = true;
875 addserver = addserver,
876 addclient = addclient,
877 wrapclient = wrapclient,
878 setquitting = setquitting,
879 closeall = closeallservers,
880 get_backend = get_backend,
881 hook_signal = hook_signal,
883 __NAME = SCRIPT_NAME,
884 __DATE = LAST_MODIFIED,
885 __AUTHOR = SCRIPT_AUTHOR,
886 __VERSION = SCRIPT_VERSION,