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
165 debug("CALLING ONCONNECT")
168 debug("NOT CALLING ONCONNECT");
170 self.eventsession = nil
173 self.eventsession = addevent( base, nil, EV_TIMEOUT, callback, 0 )
176 --vdebug( "start listening on server socket with id:", self.id )
177 self.eventread = addevent( base, self.conn, EV_READ, self.readcallback ) -- register callback
181 function interface_mt:_start_ssl(call_onconnect) -- old socket will be destroyed, therefore we have to close read/write events first
182 --vdebug( "starting ssl session with client id:", self.id )
184 _ = self.eventread and self.eventread:close( ) -- close events; this must be called outside of the event callbacks!
185 _ = self.eventwrite and self.eventwrite:close( )
186 self.eventread, self.eventwrite = nil, nil
188 self.conn, err = ssl.wrap( self.conn, self._sslctx )
190 self.fatalerror = err
191 self.conn = nil -- cannot be used anymore
192 if call_onconnect then
193 self.ondisconnect = nil -- dont call this when client isnt really connected
196 debug( "fatal error while ssl wrapping:", err )
199 self.conn:settimeout( 0 ) -- set non blocking
200 local handshakecallback = coroutine_wrap(
204 local maxattempt = cfg.MAX_HANDSHAKE_ATTEMPTS
205 while attempt < maxattempt do -- no endless loop
206 attempt = attempt + 1
207 debug( "ssl handshake of client with id:"..tostring(self)..", attempt:"..attempt )
208 if attempt > maxattempt then
209 self.fatalerror = "max handshake attempts exceeded"
210 elseif EV_TIMEOUT == event then
211 self.fatalerror = "timeout during handshake"
213 _, err = self.conn:dohandshake( )
215 self:_lock( false, false, false ) -- unlock the interface; sending, closing etc allowed
216 self.send = self.conn.send -- caching table lookups with new client object
217 self.receive = self.conn.receive
219 if not call_onconnect then -- trigger listener
220 self:onstatus("ssl-handshake-complete");
222 self:_start_session( call_onconnect )
223 debug( "ssl handshake done" )
224 self.eventhandshake = nil
227 debug( "error during ssl handshake:", err )
228 if err == "wantwrite" then
230 elseif err == "wantread" then
233 self.fatalerror = err
236 if self.fatalerror then
237 if call_onconnect then
238 self.ondisconnect = nil -- dont call this when client isnt really connected
241 debug( "handshake failed because:", self.fatalerror )
242 self.eventhandshake = nil
245 event = coroutine_yield( event, cfg.HANDSHAKE_TIMEOUT ) -- yield this monster...
249 debug "starting handshake..."
250 self:_lock( false, true, true ) -- unlock read/write events, but keep interface locked
251 self.eventhandshake = addevent( base, self.conn, EV_READWRITE, handshakecallback, cfg.HANDSHAKE_TIMEOUT )
254 function interface_mt:_destroy() -- close this interface + events and call last listener
255 debug( "closing client with id:", self.id )
256 self:_lock( true, true, true ) -- first of all, lock the interface to avoid further actions
258 _ = self.eventread and self.eventread:close( ) -- close events; this must be called outside of the event callbacks!
259 if self.type == "client" then
260 _ = self.eventwrite and self.eventwrite:close( )
261 _ = self.eventhandshake and self.eventhandshake:close( )
262 _ = self.eventstarthandshake and self.eventstarthandshake:close( )
263 _ = self.eventconnect and self.eventconnect:close( )
264 _ = self.eventsession and self.eventsession:close( )
265 _ = self.eventwritetimeout and self.eventwritetimeout:close( )
266 _ = self.eventreadtimeout and self.eventreadtimeout:close( )
267 _ = 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)
268 _ = self.conn and self.conn:close( ) -- close connection, must also be called outside of any socket registered events!
269 _ = self._server and self._server:counter(-1);
270 self.eventread, self.eventwrite = nil, nil
271 self.eventstarthandshake, self.eventhandshake, self.eventclose = nil, nil, nil
272 self.readcallback, self.writecallback = nil, nil
275 self.eventread, self.eventclose = nil, nil
276 self.interface, self.readcallback = nil, nil
278 interfacelist( "delete", self )
282 function interface_mt:_lock(nointerface, noreading, nowriting) -- lock or unlock this interface or events
283 self.nointerface, self.noreading, self.nowriting = nointerface, noreading, nowriting
284 return nointerface, noreading, nowriting
288 function interface_mt:lock_read(switch)
292 return self:resume();
296 function interface_mt:pause()
297 return self:_lock(self.nointerface, true, self.nowriting);
300 function interface_mt:resume()
301 return self:_lock(self.nointerface, false, self.nowriting);
304 function interface_mt:counter(c)
306 self._connections = self._connections + c
308 return self._connections
312 function interface_mt:write(data)
313 if self.nowriting then return nil, "locked" end
314 --vdebug( "try to send data to client, id/data:", self.id, data )
315 data = tostring( data )
316 local len = string_len( data )
317 local total = len + self.writebufferlen
318 if total > cfg.MAX_SEND_LENGTH then -- check buffer length
319 local err = "send buffer exceeded"
320 debug( "error:", err ) -- to much, check your app
323 self.writebuffer = self.writebuffer .. data -- new buffer
324 self.writebufferlen = total
325 if not self.eventwrite then -- register new write event
326 --vdebug( "register new write event" )
327 self.eventwrite = addevent( base, self.conn, EV_WRITE, self.writecallback, cfg.WRITE_TIMEOUT )
331 function interface_mt:close(now)
332 if self.nointerface then return nil, "locked"; end
333 debug( "try to close client connection with id:", self.id )
334 if self.type == "client" then
335 self.fatalerror = "client to close"
336 if ( not self.eventwrite ) or now then -- try to close immediately
337 self:_lock( true, true, true )
340 else -- wait for incomplete write request
341 self:_lock( true, true, false )
342 debug "closing delayed until writebuffer is empty"
343 return nil, "writebuffer not empty, waiting"
346 debug( "try to close server with id:", self.id, "args:", now )
347 self.fatalerror = "server to close"
350 for _, item in ipairs( interfacelist( ) ) do
351 if ( item.type ~= "server" ) and ( item._server == self ) then -- client/server match
352 if item:close( now ) then -- writebuffer was empty
357 local timeout = 0 -- dont wait for unfinished writebuffers of clients...
359 timeout = cfg.WRITE_TIMEOUT -- ...or wait for it
361 self:_close( timeout ) -- add new event to remove the server interface
362 debug( "seconds remained until server is closed:", timeout )
363 return count -- returns finished clients with empty writebuffer
367 function interface_mt:server()
368 return self._server or self;
371 function interface_mt:port()
375 function interface_mt:serverport()
376 return self._serverport
379 function interface_mt:ip()
383 function interface_mt:ssl()
384 return self._usingssl
387 function interface_mt:type()
388 return self._type or "client"
391 function interface_mt:connections()
392 return self._connections
395 function interface_mt:address()
399 function interface_mt:set_sslctx(sslctx)
400 self._sslctx = sslctx;
402 self.starttls = nil; -- use starttls() of interface_mt
404 self.starttls = false; -- prevent starttls()
408 function interface_mt:set_mode(pattern)
410 self._pattern = pattern;
412 return self._pattern;
415 function interface_mt:set_send(new_send)
416 -- No-op, we always use the underlying connection's send
419 function interface_mt:starttls(sslctx, call_onconnect)
420 debug( "try to start ssl at client id:", self.id )
422 self._sslctx = sslctx;
423 if self._usingssl then -- startssl was already called
424 err = "ssl already active"
427 debug( "error:", err )
430 self._usingssl = true
431 self.startsslcallback = function( ) -- we have to start the handshake outside of a read/write event
432 self.startsslcallback = nil
433 self:_start_ssl(call_onconnect);
434 self.eventstarthandshake = nil
437 if not self.eventwrite then
438 self:_lock( true, true, true ) -- lock the interface, to not disturb the handshake
439 self.eventstarthandshake = addevent( base, nil, EV_TIMEOUT, self.startsslcallback, 0 ) -- add event to start handshake
440 else -- wait until writebuffer is empty
441 self:_lock( true, true, false )
442 debug "ssl session delayed until writebuffer is empty..."
444 self.starttls = false;
448 function interface_mt:setoption(option, value)
449 if self.conn.setoption then
450 return self.conn:setoption(option, value);
452 return false, "setoption not implemented";
455 function interface_mt:setlistener(listener)
456 self.onconnect, self.ondisconnect, self.onincoming, self.ontimeout, self.onstatus
457 = listener.onconnect, listener.ondisconnect, listener.onincoming, listener.ontimeout, listener.onstatus;
461 function interface_mt:onconnect()
462 return self:onincoming(nil);
464 function interface_mt:onincoming()
466 function interface_mt:ondisconnect()
468 function interface_mt:ontimeout()
470 function interface_mt:ondrain()
472 function interface_mt:onstatus()
476 -- End of client interface methods
480 local string_sub = string.sub -- caching table lookups
481 local string_len = string.len
482 local addevent = base.addevent
483 local coroutine_wrap = coroutine.wrap
484 local socket_gettime = socket.gettime
485 local coroutine_yield = coroutine.yield
486 function handleclient( client, ip, port, server, pattern, listener, _, sslctx ) -- creates an client interface
487 --vdebug("creating client interfacce...")
491 currenttime = socket_gettime( ); -- safe the origin
492 writebuffer = ""; -- writebuffer
493 writebufferlen = 0; -- length of writebuffer
494 send = client.send; -- caching table lookups
495 receive = client.receive;
496 onconnect = listener.onconnect; -- will be called when client disconnects
497 ondisconnect = listener.ondisconnect; -- will be called when client disconnects
498 onincoming = listener.onincoming; -- will be called when client sends data
499 ontimeout = listener.ontimeout; -- called when fatal socket timeout occurs
500 onstatus = listener.onstatus; -- called for status changes (e.g. of SSL/TLS)
501 eventread = false, eventwrite = false, eventclose = false,
502 eventhandshake = false, eventstarthandshake = false; -- event handler
503 eventconnect = false, eventsession = false; -- more event handler...
504 eventwritetimeout = false; -- even more event handler...
505 eventreadtimeout = false;
506 fatalerror = false; -- error message
507 writecallback = false; -- will be called on write events
508 readcallback = false; -- will be called on read events
509 nointerface = true; -- lock/unlock parameter of this interface
510 noreading = false, nowriting = false; -- locks of the read/writecallback
511 startsslcallback = false; -- starting handshake callback
512 position = false; -- position of client in interfacelist
515 _ip = ip, _port = port, _server = server, _pattern = pattern,
516 _serverport = (server and server:port() or nil),
517 _sslctx = sslctx; -- parameters
518 _usingssl = false; -- client is using ssl;
520 if not ssl then interface.starttls = false; end
521 interface.id = tostring(interface):match("%x+$");
522 interface.writecallback = function( event ) -- called on write events
523 --vdebug( "new client write event, id/ip/port:", interface, ip, port )
524 if interface.nowriting or ( interface.fatalerror and ( "client to close" ~= interface.fatalerror ) ) then -- leave this event
525 --vdebug( "leaving this event because:", interface.nowriting or interface.fatalerror )
526 interface.eventwrite = false
529 if EV_TIMEOUT == event then -- took too long to write some data to socket -> disconnect
530 interface.fatalerror = "timeout during writing"
531 debug( "writing failed:", interface.fatalerror )
533 interface.eventwrite = false
536 if interface._usingssl then -- handle luasec
537 if interface.eventreadtimeout then -- we have to read first
538 local ret = interface.readcallback( ) -- call readcallback
539 --vdebug( "tried to read in writecallback, result:", ret )
541 if interface.eventwritetimeout then -- luasec only
542 interface.eventwritetimeout:close( ) -- first we have to close timeout event which where regged after a wantread error
543 interface.eventwritetimeout = false
546 local succ, err, byte = interface.conn:send( interface.writebuffer, 1, interface.writebufferlen )
547 --vdebug( "write data:", interface.writebuffer, "error:", err, "part:", byte )
548 if succ then -- writing succesful
549 interface.writebuffer = ""
550 interface.writebufferlen = 0
552 if interface.fatalerror then
553 debug "closing client after writing"
554 interface:_close() -- close interface if needed
555 elseif interface.startsslcallback then -- start ssl connection if needed
556 debug "starting ssl handshake after writing"
557 interface.eventstarthandshake = addevent( base, nil, EV_TIMEOUT, interface.startsslcallback, 0 )
558 elseif interface.eventreadtimeout then
559 return EV_WRITE, EV_TIMEOUT
561 interface.eventwrite = nil
563 elseif byte and (err == "timeout" or err == "wantwrite") then -- want write again
564 --vdebug( "writebuffer is not empty:", err )
565 interface.writebuffer = string_sub( interface.writebuffer, byte + 1, interface.writebufferlen ) -- new buffer
566 interface.writebufferlen = interface.writebufferlen - byte
567 if "wantread" == err then -- happens only with luasec
568 local callback = function( )
570 interface.eventwritetimeout = nil
573 interface.eventwritetimeout = addevent( base, nil, EV_TIMEOUT, callback, cfg.WRITE_TIMEOUT ) -- reg a new timeout event
574 debug( "wantread during write attempt, reg it in readcallback but dont know what really happens next..." )
575 -- hopefully this works with luasec; its simply not possible to use 2 different write events on a socket in luaevent
578 return EV_WRITE, cfg.WRITE_TIMEOUT
579 else -- connection was closed during writing or fatal error
580 interface.fatalerror = err or "fatal error"
581 debug( "connection failed in write event:", interface.fatalerror )
583 interface.eventwrite = nil
589 interface.readcallback = function( event ) -- called on read events
590 --vdebug( "new client read event, id/ip/port:", tostring(interface.id), tostring(ip), tostring(port) )
591 if interface.noreading or interface.fatalerror then -- leave this event
592 --vdebug( "leaving this event because:", tostring(interface.noreading or interface.fatalerror) )
593 interface.eventread = nil
596 if EV_TIMEOUT == event then -- took too long to get some data from client -> disconnect
597 interface.fatalerror = "timeout during receiving"
598 debug( "connection failed:", interface.fatalerror )
600 interface.eventread = nil
603 if interface._usingssl then -- handle luasec
604 if interface.eventwritetimeout then -- ok, in the past writecallback was regged
605 local ret = interface.writecallback( ) -- call it
606 --vdebug( "tried to write in readcallback, result:", tostring(ret) )
608 if interface.eventreadtimeout then
609 interface.eventreadtimeout:close( )
610 interface.eventreadtimeout = nil
613 local buffer, err, part = interface.conn:receive( interface._pattern ) -- receive buffer with "pattern"
614 --vdebug( "read data:", tostring(buffer), "error:", tostring(err), "part:", tostring(part) )
615 buffer = buffer or part or ""
616 local len = string_len( buffer )
617 if len > cfg.MAX_READ_LENGTH then -- check buffer length
618 interface.fatalerror = "receive buffer exceeded"
619 debug( "fatal error:", interface.fatalerror )
621 interface.eventread = nil
624 interface.onincoming( interface, buffer, err ) -- send new data to listener
625 if err and ( err ~= "timeout" and err ~= "wantread" ) then
626 if "wantwrite" == err then -- need to read on write event
627 if not interface.eventwrite then -- register new write event if needed
628 interface.eventwrite = addevent( base, interface.conn, EV_WRITE, interface.writecallback, cfg.WRITE_TIMEOUT )
630 interface.eventreadtimeout = addevent( base, nil, EV_TIMEOUT,
633 end, cfg.READ_TIMEOUT
635 debug( "wantwrite during read attempt, reg it in writecallback but dont know what really happens next..." )
636 -- to be honest i dont know what happens next, if it is allowed to first read, the write etc...
637 else -- connection was closed or fatal error
638 interface.fatalerror = err
639 debug( "connection failed in read event:", interface.fatalerror )
641 interface.eventread = nil
645 return EV_READ, cfg.READ_TIMEOUT
649 client:settimeout( 0 ) -- set non blocking
650 setmetatable(interface, interface_mt)
651 interfacelist( "add", interface ) -- add to interfacelist
658 function handleserver( server, addr, port, pattern, listener, sslctx ) -- creates an server interface
659 debug "creating server interface..."
664 onconnect = listener.onconnect; -- will be called when new client connected
665 eventread = false; -- read event handler
666 eventclose = false; -- close event handler
667 readcallback = false; -- read event callback
668 fatalerror = false; -- error message
669 nointerface = true; -- lock/unlock parameter
671 _ip = addr, _port = port, _pattern = pattern,
674 interface.id = tostring(interface):match("%x+$");
675 interface.readcallback = function( event ) -- server handler, called on incoming connections
676 --vdebug( "server can accept, id/addr/port:", interface, addr, port )
677 if interface.fatalerror then
678 --vdebug( "leaving this event because:", self.fatalerror )
679 interface.eventread = nil
682 local delay = cfg.ACCEPT_DELAY
683 if EV_TIMEOUT == event then
684 if interface._connections >= cfg.MAX_CONNECTIONS then -- check connection count
685 debug( "to many connections, seconds to wait for next accept:", delay )
686 return EV_TIMEOUT, delay -- timeout...
688 return EV_READ -- accept again
691 --vdebug("max connection check ok, accepting...")
692 local client, err = server:accept() -- try to accept; TODO: check err
694 if interface._connections >= cfg.MAX_CONNECTIONS then
695 client:close( ) -- refuse connection
696 debug( "maximal connections reached, refuse client connection; accept delay:", delay )
697 return EV_TIMEOUT, delay -- delay for next accept attempt
699 local client_ip, client_port = client:getpeername( )
700 interface._connections = interface._connections + 1 -- increase connection count
701 local clientinterface = handleclient( client, client_ip, client_port, interface, pattern, listener, nil, sslctx )
702 --vdebug( "client id:", clientinterface, "startssl:", startssl )
703 if ssl and sslctx then
704 clientinterface:starttls(sslctx, true)
706 clientinterface:_start_session( true )
708 debug( "accepted incoming client connection from:", client_ip or "<unknown IP>", client_port or "<unknown port>", "to", port or "<unknown port>");
710 client, err = server:accept() -- try to accept again
715 server:settimeout( 0 )
716 setmetatable(interface, interface_mt)
717 interfacelist( "add", interface )
718 interface:_start_session()
723 local addserver = ( function( )
724 return function( addr, port, listener, pattern, sslcfg, startssl ) -- TODO: check arguments
725 --vdebug( "creating new tcp server with following parameters:", addr or "nil", port or "nil", sslcfg or "nil", startssl or "nil")
726 local server, err = socket.bind( addr, port, cfg.ACCEPT_QUEUE ) -- create server socket
728 debug( "creating server socket failed because:", err )
734 debug "fatal error: luasec not found"
735 return nil, "luasec not found"
739 debug( "error while creating new ssl context for server socket:", err )
743 local interface = handleserver( server, addr, port, pattern, listener, sslctx, startssl ) -- new server handler
744 debug( "new server created with id:", tostring(interface))
749 local addclient, wrapclient
751 function wrapclient( client, ip, port, listeners, pattern, sslctx, startssl )
752 local interface = handleclient( client, ip, port, nil, pattern, listeners, sslctx )
753 interface:_start_session()
754 return interface, client
755 --function handleclient( client, ip, port, server, pattern, listener, _, sslctx ) -- creates an client interface
758 function addclient( addr, serverport, listener, pattern, localaddr, localport, sslcfg, startssl )
759 local client, err = socket.tcp() -- creating new socket
761 debug( "cannot create socket:", err )
764 client:settimeout( 0 ) -- set nonblocking
766 local res, err = client:bind( localaddr, localport, -1 )
768 debug( "cannot bind client:", err )
773 if sslcfg then -- handle ssl/new context
775 debug "need luasec, but not available"
776 return nil, "luasec not found"
780 debug( "cannot create new ssl context:", err )
784 local res, err = client:connect( addr, serverport ) -- connect
785 if res or ( err == "timeout" ) then
786 local ip, port = client:getsockname( )
787 local server = function( )
788 return nil, "this is a dummy server interface"
790 local interface = wrapclient( client, ip, serverport, listener, pattern, sslctx, startssl )
791 interface:_start_connection( startssl )
792 debug( "new connection id:", interface.id )
793 return interface, err
795 debug( "new connection failed:", err )
802 local loop = function( ) -- starts the event loop
807 local newevent = ( function( )
808 local add = base.addevent
809 return function( ... )
810 return add( base, ... )
814 local closeallservers = function( arg )
815 for _, item in ipairs( interfacelist( ) ) do
816 if item.type == "server" then
822 local function setquitting(yes)
830 function get_backend()
831 return base:method();
834 -- We need to hold onto the events to stop them
835 -- being garbage-collected
836 local signal_events = {}; -- [signal_num] -> event object
837 function hook_signal(signal_num, handler)
838 local function _handler(event)
839 local ret = handler();
840 if ret ~= false then -- Continue handling this signal?
841 return EV_SIGNAL; -- Yes
843 return -1; -- Close this event
845 signal_events[signal_num] = base:addevent(signal_num, EV_SIGNAL, _handler);
846 return signal_events[signal_num];
849 local function link(sender, receiver, buffersize)
850 sender:set_mode(buffersize);
853 function receiver:ondrain()
854 if sender_locked then
860 function sender:onincoming(data)
861 receiver:write(data);
862 if receiver.writebufferlen >= buffersize then
863 sender_locked = true;
878 addserver = addserver,
879 addclient = addclient,
880 wrapclient = wrapclient,
881 setquitting = setquitting,
882 closeall = closeallservers,
883 get_backend = get_backend,
884 hook_signal = hook_signal,
886 __NAME = SCRIPT_NAME,
887 __DATE = LAST_MODIFIED,
888 __AUTHOR = SCRIPT_AUTHOR,
889 __VERSION = SCRIPT_VERSION,