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net.server_event: Initial commit of server_event.lua. Don't get too excited, it's not used at all yet, and is still incomplete :)
author Matthew Wild <mwild1@gmail.com>
date Fri, 20 Nov 2009 22:58:56 +0000
parents
children 28c0b313b610
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equal deleted inserted replaced
2090:7810648ea26d 2091:6fd686a45806
1 --[[
2
3
4 server.lua based on lua/libevent by blastbeat
5
6 notes:
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
13
14 --]]
15
16
17 local SCRIPT_NAME = "server_event.lua"
18 local SCRIPT_VERSION = "0.05"
19 local SCRIPT_AUTHOR = "blastbeat"
20 local LAST_MODIFIED = "2009/11/20"
21
22 local cfg = {
23 MAX_CONNECTIONS = 100000, -- max per server connections (use "ulimit -n" on *nix)
24 MAX_HANDSHAKE_ATTEMPS = 10, -- attemps to finish ssl handshake
25 HANDSHAKE_TIMEOUT = 1, -- timout in seconds per handshake attemp
26 MAX_READ_LENGTH = 1024 * 1024 * 1024 * 1024, -- max bytes allowed to read from sockets
27 MAX_SEND_LENGTH = 1024 * 1024 * 1024 * 1024, -- max bytes size of write buffer (for writing on sockets)
28 ACCEPT_DELAY = 10, -- seconds to wait until the next attemp of a full server to accept
29 READ_TIMEOUT = 60 * 30, -- timeout in seconds for read data from socket
30 WRITE_TIMEOUT = 30, -- timeout in seconds for write data on socket
31 CONNECT_TIMEOUT = 10, -- timeout in seconds for connection attemps
32 CLEAR_DELAY = 5, -- seconds to wait for clearing interface list (and calling ondisconnect listeners)
33 DEBUG = true, -- show debug messages
34 }
35
36 local function use(x) return rawget(_G, x); end
37 local print = use "print"
38 local pcall = use "pcall"
39 local ipairs = use "ipairs"
40 local string = use "string"
41 local select = use "select"
42 local require = use "require"
43 local tostring = use "tostring"
44 local coroutine = use "coroutine"
45 local setmetatable = use "setmetatable"
46
47 local ssl = use "ssl"
48 local socket = use "socket"
49
50 local log = require ("util.logger").init("socket")
51
52 local function debug(...)
53 return log("debug", ("%s "):rep(select('#', ...)), ...)
54 end
55
56 local bitor = ( function( ) -- thx Rici Lake
57 local hasbit = function( x, p )
58 return x % ( p + p ) >= p
59 end
60 return function( x, y )
61 local p = 1
62 local z = 0
63 local limit = x > y and x or y
64 while p <= limit do
65 if hasbit( x, p ) or hasbit( y, p ) then
66 z = z + p
67 end
68 p = p + p
69 end
70 return z
71 end
72 end )( )
73
74 local getid = function( )
75 return function( )
76 end
77 end
78
79 local event = require "luaevent.core"
80 local base = event.new( )
81 local EV_READ = event.EV_READ
82 local EV_WRITE = event.EV_WRITE
83 local EV_TIMEOUT = event.EV_TIMEOUT
84
85 local EV_READWRITE = bitor( EV_READ, EV_WRITE )
86
87 local interfacelist = ( function( ) -- holds the interfaces for sockets
88 local array = { }
89 local len = 0
90 return function( method, arg )
91 if "add" == method then
92 len = len + 1
93 array[ len ] = arg
94 arg:_position( len )
95 return len
96 elseif "delete" == method then
97 if len <= 0 then
98 return nil, "array is already empty"
99 end
100 local position = arg:_position() -- get position in array
101 if position ~= len then
102 local interface = array[ len ] -- get last interface
103 array[ position ] = interface -- copy it into free position
104 array[ len ] = nil -- free last position
105 interface:_position( position ) -- set new position in array
106 else -- free last position
107 array[ len ] = nil
108 end
109 len = len - 1
110 return len
111 else
112 return array
113 end
114 end
115 end )( )
116
117 -- Client interface methods
118 local interface_mt
119 do
120 interface_mt = {}; interface_mt.__index = interface_mt;
121
122 local addevent = base.addevent
123 local coroutine_wrap, coroutine_yield = coroutine.wrap,coroutine.yield
124 local string_len = string.len
125
126 -- Private methods
127 function interface_mt:_position(new_position)
128 self.position = new_position or self.position
129 return self.position;
130 end
131 function interface_mt:_close() -- regs event to start self:_destroy()
132 local callback = function( )
133 self:_destroy();
134 self.eventclose = nil
135 return -1
136 end
137 self.eventclose = addevent( base, nil, EV_TIMEOUT, callback, 0 )
138 return true
139 end
140
141 function interface_mt:_start_connection(plainssl) -- should be called from addclient
142 local callback = function( event )
143 if EV_TIMEOUT == event then -- timout during connection
144 self.fatalerror = "connection timeout"
145 self.listener.ontimeout( self ) -- call timeout listener
146 self:_close()
147 debug( "new connection failed. id:", self, "error:", self.fatalerror )
148 else
149 if plainssl then -- start ssl session
150 self:_start_ssl( self.listener.onconnect )
151 else -- normal connection
152 self:_start_session( self.listener.onconnect )
153 end
154 debug( "new connection established. id:", self )
155 end
156 self.eventconnect = nil
157 return -1
158 end
159 self.eventconnect = addevent( base, self.conn, EV_WRITE, callback, cfg.CONNECT_TIMEOUT )
160 return true
161 end
162 function interface_mt:_start_session(onconnect) -- new session, for example after startssl
163 if self.type == "client" then
164 local callback = function( )
165 self:_lock( false, false, false )
166 --vdebug( "start listening on client socket with id:", self )
167 self.eventread = addevent( base, self.conn, EV_READ, self.readcallback, cfg.READ_TIMEOUT ) -- register callback
168 onconnect( self )
169 self.eventsession = nil
170 return -1
171 end
172 self.eventsession = addevent( base, nil, EV_TIMEOUT, callback, 0 )
173 else
174 self:_lock( false )
175 --vdebug( "start listening on server socket with id:", self )
176 self.eventread = addevent( base, self.conn, EV_READ, self.readcallback ) -- register callback
177 end
178 return true
179 end
180 function interface_mt:_start_ssl(arg) -- old socket will be destroyed, therefore we have to close read/write events first
181 --vdebug( "starting ssl session with client id:", self )
182 local _
183 _ = self.eventread and self.eventread:close( ) -- close events; this must be called outside of the event callbacks!
184 _ = self.eventwrite and self.eventwrite:close( )
185 self.eventread, self.eventwrite = nil, nil
186 local err
187 self.conn, err = ssl.wrap( self.conn, self.sslctx )
188 if err then
189 self.fatalerror = err
190 self.conn = nil -- cannot be used anymore
191 if "onconnect" == arg then
192 self.ondisconnect = nil -- dont call this when client isnt really connected
193 end
194 self:_close()
195 debug( "fatal error while ssl wrapping:", err )
196 return false
197 end
198 self.conn:settimeout( 0 ) -- set non blocking
199 local handshakecallback = coroutine_wrap(
200 function( event )
201 local _, err
202 local attempt = 0
203 local maxattempt = cfg.MAX_HANDSHAKE_ATTEMPS
204 while attempt < 1000 do -- no endless loop
205 attempt = attempt + 1
206 debug( "ssl handshake of client with id:", self, "attemp:", attempt )
207 if attempt > maxattempt then
208 self.fatalerror = "max handshake attemps exceeded"
209 elseif EV_TIMEOUT == event then
210 self.fatalerror = "timeout during handshake"
211 else
212 _, err = self.conn:dohandshake( )
213 if not err then
214 self:_lock( false, false, false ) -- unlock the interface; sending, closing etc allowed
215 self.send = self.conn.send -- caching table lookups with new client object
216 self.receive = self.conn.receive
217 local onsomething
218 if "onconnect" == arg then -- trigger listener
219 onsomething = self.listener.onconnect
220 else
221 onsomething = self.listener.onsslconnection
222 end
223 self:_start_session( onsomething )
224 debug( "ssl handshake done" )
225 self.eventhandshake = nil
226 return -1
227 end
228 debug( "error during ssl handshake:", err )
229 if err == "wantwrite" then
230 event = EV_WRITE
231 elseif err == "wantread" then
232 event = EV_READ
233 else
234 self.fatalerror = err
235 end
236 end
237 if self.fatalerror then
238 if "onconnect" == arg then
239 self.ondisconnect = nil -- dont call this when client isnt really connected
240 end
241 self:_close()
242 debug( "handshake failed because:", self.fatalerror )
243 self.eventhandshake = nil
244 return -1
245 end
246 event = coroutine_yield( event, cfg.HANDSHAKE_TIMEOUT ) -- yield this monster...
247 end
248 end
249 )
250 debug "starting handshake..."
251 self:_lock( false, true, true ) -- unlock read/write events, but keep interface locked
252 self.eventhandshake = addevent( base, self.conn, EV_READWRITE, handshakecallback, cfg.HANDSHAKE_TIMEOUT )
253 return true
254 end
255 function interface_mt:_destroy() -- close this interface + events and call last listener
256 debug( "closing client with id:", self )
257 self:_lock( true, true, true ) -- first of all, lock the interface to avoid further actions
258 local _
259 _ = self.eventread and self.eventread:close( ) -- close events; this must be called outside of the event callbacks!
260 if self.type == "client" then
261 _ = self.eventwrite and self.eventwrite:close( )
262 _ = self.eventhandshake and self.eventhandshake:close( )
263 _ = self.eventstarthandshake and self.eventstarthandshake:close( )
264 _ = self.eventconnect and self.eventconnect:close( )
265 _ = self.eventsession and self.eventsession:close( )
266 _ = self.eventwritetimeout and self.eventwritetimeout:close( )
267 _ = self.eventreadtimeout and self.eventreadtimeout:close( )
268 _ = self.ondisconnect and self:ondisconnect( self.fatalerror ) -- call ondisconnect listener (wont be the case if handshake failed on connect)
269 _ = self.conn and self.conn:close( ) -- close connection, must also be called outside of any socket registered events!
270 self._server:counter(-1);
271 self.eventread, self.eventwrite = nil, nil
272 self.eventstarthandshake, self.eventhandshake, self.eventclose = nil, nil, nil
273 self.readcallback, self.writecallback = nil, nil
274 else
275 self.conn:close( )
276 self.eventread, self.eventclose = nil, nil
277 self.interface, self.readcallback = nil, nil
278 end
279 interfacelist( "delete", self )
280 return true
281 end
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
285 end
286
287 function interface_mt:counter(c)
288 if c then
289 self._connections = self._connections - c
290 end
291 return self._connections
292 end
293
294 -- Public methods
295 function interface_mt:write(data)
296 --vdebug( "try to send data to client, id/data:", self, data )
297 data = tostring( data )
298 local len = string_len( data )
299 local total = len + self.writebufferlen
300 if total > cfg.MAX_SEND_LENGTH then -- check buffer length
301 local err = "send buffer exceeded"
302 debug( "error:", err ) -- to much, check your app
303 return nil, err
304 end
305 self.writebuffer = self.writebuffer .. data -- new buffer
306 self.writebufferlen = total
307 if not self.eventwrite then -- register new write event
308 --vdebug( "register new write event" )
309 self.eventwrite = addevent( base, self.conn, EV_WRITE, self.writecallback, cfg.WRITE_TIMEOUT )
310 end
311 return true
312 end
313 function interface_mt:close(now)
314 debug( "try to close client connection with id:", self )
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 )
319 self:_close()
320 return 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"
325 end
326 else
327 debug( "try to close server with id:", self, "args:", now )
328 self.fatalerror = "server to close"
329 self:_lock( true )
330 local count = 0
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
334 count = count + 1
335 end
336 end
337 end
338 local timeout = 0 -- dont wait for unfinished writebuffers of clients...
339 if not now then
340 timeout = cfg.WRITE_TIMEOUT -- ...or wait for it
341 end
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
345 end
346 end
347
348 function interface_mt:server()
349 return self._server or self;
350 end
351
352 function interface_mt:port()
353 return self._port
354 end
355
356 function interface_mt:ip()
357 return self._ip
358 end
359
360 function interface_mt:ssl()
361 return self.usingssl
362 end
363
364 function interface_mt:type()
365 return self._type or "client"
366 end
367
368 function interface_mt:connections()
369 return self._connections
370 end
371
372 function interface_mt:address()
373 return self.addr
374 end
375
376
377
378 function interface_mt:starttls()
379 debug( "try to start ssl at client id:", self )
380 local err
381 if not self.sslctx then -- no ssl available
382 err = "no ssl context available"
383 elseif self.usingssl then -- startssl was already called
384 err = "ssl already active"
385 end
386 if err then
387 debug( "error:", err )
388 return nil, err
389 end
390 self.usingssl = true
391 self.startsslcallback = function( ) -- we have to start the handshake outside of a read/write event
392 self:_start_ssl();
393 self.eventstarthandshake = nil
394 return -1
395 end
396 if not self.eventwrite then
397 self:_lock( true, true, true ) -- lock the interface, to not disturb the handshake
398 self.eventstarthandshake = addevent( base, nil, EV_TIMEOUT, self.startsslcallback, 0 ) -- add event to start handshake
399 else -- wait until writebuffer is empty
400 self:_lock( true, true, false )
401 debug "ssl session delayed until writebuffer is empty..."
402 end
403 return true
404 end
405
406 function interface_mt.onconnect()
407 end
408 end
409
410 -- End of client interface methods
411
412 local handleclient;
413 do
414 local string_sub = string.sub -- caching table lookups
415 local string_len = string.len
416 local addevent = base.addevent
417 local coroutine_wrap = coroutine.wrap
418 local socket_gettime = socket.gettime
419 local coroutine_yield = coroutine.yield
420 function handleclient( client, ip, port, server, pattern, listener, _, sslctx ) -- creates an client interface
421 --vdebug("creating client interfacce...")
422 local interface = {
423 type = "client";
424 conn = client;
425 currenttime = socket_gettime( ); -- safe the origin
426 writebuffer = ""; -- writebuffer
427 writebufferlen = 0; -- length of writebuffer
428 send = client.send; -- caching table lookups
429 receive = client.receive;
430 onconnect = listener.onconnect; -- will be called when client disconnects
431 ondisconnect = listener.ondisconnect; -- will be called when client disconnects
432 onincoming = listener.onincoming; -- will be called when client sends data
433 eventread = false, eventwrite = false, eventclose = false,
434 eventhandshake = false, eventstarthandshake = false; -- event handler
435 eventconnect = false, eventsession = false; -- more event handler...
436 eventwritetimeout = false; -- even more event handler...
437 eventreadtimeout = false;
438 fatalerror = false; -- error message
439 writecallback = false; -- will be called on write events
440 readcallback = false; -- will be called on read events
441 nointerface = true; -- lock/unlock parameter of this interface
442 noreading = false, nowriting = false; -- locks of the read/writecallback
443 startsslcallback = false; -- starting handshake callback
444 position = false; -- position of client in interfacelist
445
446 -- Properties
447 _ip = ip, _port = port, _server = server, _pattern = pattern,
448 _sslctx = sslctx; -- parameters
449 _usingssl = false; -- client is using ssl;
450 }
451 interface.writecallback = function( event ) -- called on write events
452 --vdebug( "new client write event, id/ip/port:", interface, ip, port )
453 if interface.nowriting or ( interface.fatalerror and ( "client to close" ~= interface.fatalerror ) ) then -- leave this event
454 --vdebug( "leaving this event because:", interface.nowriting or interface.fatalerror )
455 interface.eventwrite = false
456 return -1
457 end
458 if EV_TIMEOUT == event then -- took too long to write some data to socket -> disconnect
459 interface.fatalerror = "timeout during writing"
460 debug( "writing failed:", interface.fatalerror )
461 interface:_close()
462 interface.eventwrite = false
463 return -1
464 else -- can write :)
465 if interface.usingssl then -- handle luasec
466 if interface.eventreadtimeout then -- we have to read first
467 local ret = interface.readcallback( ) -- call readcallback
468 --vdebug( "tried to read in writecallback, result:", ret )
469 end
470 if interface.eventwritetimeout then -- luasec only
471 interface.eventwritetimeout:close( ) -- first we have to close timeout event which where regged after a wantread error
472 interface.eventwritetimeout = false
473 end
474 end
475 local succ, err, byte = interface.send( interface.conn, interface.writebuffer, 1, interface.writebufferlen )
476 --vdebug( "write data:", interface.writebuffer, "error:", err, "part:", byte )
477 if succ then -- writing succesful
478 interface.writebuffer = ""
479 interface.writebufferlen = 0
480 if interface.fatalerror then
481 debug "closing client after writing"
482 interface:_close() -- close interface if needed
483 elseif interface.startsslcallback then -- start ssl connection if needed
484 debug "starting ssl handshake after writing"
485 interface.eventstarthandshake = addevent( base, nil, EV_TIMEOUT, interface.startsslcallback, 0 )
486 elseif interface.eventreadtimeout then
487 return EV_WRITE, EV_TIMEOUT
488 end
489 interface.eventwrite = nil
490 return -1
491 elseif byte then -- want write again
492 --vdebug( "writebuffer is not empty:", err )
493 interface.writebuffer = string_sub( interface.writebuffer, byte + 1, interface.writebufferlen ) -- new buffer
494 interface.writebufferlen = interface.writebufferlen - byte
495 if "wantread" == err then -- happens only with luasec
496 local callback = function( )
497 interface:_close()
498 interface.eventwritetimeout = nil
499 return evreturn, evtimeout
500 end
501 interface.eventwritetimeout = addevent( base, nil, EV_TIMEOUT, callback, cfg.WRITE_TIMEOUT ) -- reg a new timeout event
502 debug( "wantread during write attemp, reg it in readcallback but dont know what really happens next..." )
503 -- hopefully this works with luasec; its simply not possible to use 2 different write events on a socket in luaevent
504 return -1
505 end
506 return EV_WRITE, cfg.WRITE_TIMEOUT
507 else -- connection was closed during writing or fatal error
508 interface.fatalerror = err or "fatal error"
509 debug( "connection failed in write event:", interface.fatalerror )
510 interface:_close()
511 interface.eventwrite = nil
512 return -1
513 end
514 end
515 end
516 local usingssl, receive = interface._usingssl, interface.receive;
517 interface.readcallback = function( event ) -- called on read events
518 --vdebug( "new client read event, id/ip/port:", interface, ip, port )
519 if interface.noreading or interface.fatalerror then -- leave this event
520 --vdebug( "leaving this event because:", interface.noreading or interface.fatalerror )
521 interface.eventread = nil
522 return -1
523 end
524 if EV_TIMEOUT == event then -- took too long to get some data from client -> disconnect
525 interface.fatalerror = "timeout during receiving"
526 debug( "connection failed:", interface.fatalerror )
527 interface:_close()
528 interface.eventread = nil
529 return -1
530 else -- can read
531 if usingssl then -- handle luasec
532 if interface.eventwritetimeout then -- ok, in the past writecallback was regged
533 local ret = interface.writecallback( ) -- call it
534 --vdebug( "tried to write in readcallback, result:", ret )
535 end
536 if interface.eventreadtimeout then
537 interface.eventreadtimeout:close( )
538 interface.eventreadtimeout = nil
539 end
540 end
541 local buffer, err, part = receive( client, pattern ) -- receive buffer with "pattern"
542 --vdebug( "read data:", buffer, "error:", err, "part:", part )
543 buffer = buffer or part or ""
544 local len = string_len( buffer )
545 if len > cfg.MAX_READ_LENGTH then -- check buffer length
546 interface.fatalerror = "receive buffer exceeded"
547 debug( "fatal error:", interface.fatalerror )
548 interface:_close()
549 interface.eventread = nil
550 return -1
551 end
552 if err and ( "timeout" ~= err ) then
553 if "wantwrite" == err then -- need to read on write event
554 if not interface.eventwrite then -- register new write event if needed
555 interface.eventwrite = addevent( base, interface.conn, EV_WRITE, interface.writecallback, cfg.WRITE_TIMEOUT )
556 end
557 interface.eventreadtimeout = addevent( base, nil, EV_TIMEOUT,
558 function( )
559 interface:_close()
560 end, cfg.READ_TIMEOUT
561 )
562 debug( "wantwrite during read attemp, reg it in writecallback but dont know what really happens next..." )
563 -- to be honest i dont know what happens next, if it is allowed to first read, the write etc...
564 else -- connection was closed or fatal error
565 interface.fatalerror = err
566 debug( "connection failed in read event:", interface.fatalerror )
567 interface:_close()
568 interface.eventread = nil
569 return -1
570 end
571 end
572 interface.onincoming( interface, buffer, err ) -- send new data to listener
573 return EV_READ, cfg.READ_TIMEOUT
574 end
575 end
576
577 client:settimeout( 0 ) -- set non blocking
578 setmetatable(interface, interface_mt)
579 interfacelist( "add", interface ) -- add to interfacelist
580 return interface
581 end
582 end
583
584 local handleserver
585 do
586 function handleserver( server, addr, port, pattern, listener, sslctx, startssl ) -- creates an server interface
587 debug "creating server interface..."
588 local interface = {
589 _connections = 0;
590
591 conn = server;
592 onconnect = listener.onconnect; -- will be called when new client connected
593 eventread = false; -- read event handler
594 eventclose = false; -- close event handler
595 readcallback = false; -- read event callback
596 fatalerror = false; -- error message
597 nointerface = true; -- lock/unlock parameter
598 }
599 interface.readcallback = function( event ) -- server handler, called on incoming connections
600 --vdebug( "server can accept, id/addr/port:", interface, addr, port )
601 if interface.fatalerror then
602 --vdebug( "leaving this event because:", self.fatalerror )
603 interface.eventread = nil
604 return -1
605 end
606 local delay = cfg.ACCEPT_DELAY
607 if EV_TIMEOUT == event then
608 if interface._connections >= cfg.MAX_CONNECTIONS then -- check connection count
609 debug( "to many connections, seconds to wait for next accept:", delay )
610 return EV_TIMEOUT, delay -- timeout...
611 else
612 return EV_READ -- accept again
613 end
614 end
615 --vdebug("max connection check ok, accepting...")
616 local client, err = server:accept() -- try to accept; TODO: check err
617 while client do
618 if interface._connections >= cfg.MAX_CONNECTIONS then
619 client:close( ) -- refuse connection
620 debug( "maximal connections reached, refuse client connection; accept delay:", delay )
621 return EV_TIMEOUT, delay -- delay for next accept attemp
622 end
623 local ip, port = client:getpeername( )
624 interface._connections = interface._connections + 1 -- increase connection count
625 local clientinterface = handleclient( client, ip, port, interface, pattern, listener, nil, sslctx )
626 --vdebug( "client id:", clientinterface, "startssl:", startssl )
627 if startssl then
628 clientinterface:_start_ssl( clientinterface.onconnect )
629 else
630 clientinterface:_start_session( clientinterface.onconnect )
631 end
632 debug( "accepted incoming client connection from:", ip, port )
633 client, err = server:accept() -- try to accept again
634 end
635 return EV_READ
636 end
637
638 server:settimeout( 0 )
639 setmetatable(interface, interface_mt)
640 interfacelist( "add", interface )
641 interface:_start_session()
642 return interface
643 end
644 end
645
646 local addserver = ( function( )
647 return function( addr, port, listener, pattern, backlog, sslcfg, startssl ) -- TODO: check arguments
648 debug( "creating new tcp server with following parameters:", addr or "nil", port or "nil", sslcfg or "nil", startssl or "nil")
649 local server, err = socket.bind( addr, port, backlog ) -- create server socket
650 if not server then
651 debug( "creating server socket failed because:", err )
652 return nil, err
653 end
654 local sslctx
655 if sslcfg then
656 if not ssl then
657 debug "fatal error: luasec not found"
658 return nil, "luasec not found"
659 end
660 sslctx, err = ssl.newcontext( sslcfg )
661 if err then
662 debug( "error while creating new ssl context for server socket:", err )
663 return nil, err
664 end
665 end
666 local interface = handleserver( server, addr, port, pattern, listener, sslctx, startssl ) -- new server handler
667 debug( "new server created with id:", tostring(interface))
668 return interface
669 end
670 end )( )
671
672 local wrapclient = ( function( )
673 return function( client, addr, serverport, listener, pattern, localaddr, localport, sslcfg, startssl )
674 debug( "try to connect to:", addr, serverport, "with parameters:", pattern, localaddr, localport, sslcfg, startssl )
675 local sslctx
676 if sslcfg then -- handle ssl/new context
677 if not ssl then
678 debug "need luasec, but not available"
679 return nil, "luasec not found"
680 end
681 sslctx, err = ssl.newcontext( sslcfg )
682 if err then
683 debug( "cannot create new ssl context:", err )
684 return nil, err
685 end
686 end
687 end
688 end )( )
689
690 local addclient = ( function( )
691 return function( addr, serverport, listener, pattern, localaddr, localport, sslcfg, startssl )
692 local client, err = socket.tcp() -- creating new socket
693 if not client then
694 debug( "cannot create socket:", err )
695 return nil, err
696 end
697 client:settimeout( 0 ) -- set nonblocking
698 if localaddr then
699 local res, err = client:bind( localaddr, localport, -1 )
700 if not res then
701 debug( "cannot bind client:", err )
702 return nil, err
703 end
704 end
705 local res, err = client:connect( addr, serverport ) -- connect
706 if res or ( err == "timeout" ) then
707 local ip, port = client:getsockname( )
708 local server = function( )
709 return nil, "this is a dummy server interface"
710 end
711 local interface = handleclient( client, ip, port, server, pattern, listener, sslctx )
712 interface:_start_connection( startssl )
713 debug( "new connection id:", interface )
714 return interface, err
715 else
716 debug( "new connection failed:", err )
717 return nil, err
718 end
719 return wrapclient( client, addr, serverport, listener, pattern, localaddr, localport, sslcfg, startssl )
720 end
721 end )( )
722
723 local loop = function( ) -- starts the event loop
724 return base:loop( )
725 end
726
727 local newevent = ( function( )
728 local add = base.addevent
729 return function( ... )
730 return add( base, ... )
731 end
732 end )( )
733
734 local closeallservers = function( arg )
735 for _, item in ipairs( interfacelist( ) ) do
736 if item "type" == "server" then
737 item( "close", arg )
738 end
739 end
740 end
741
742 return {
743
744 cfg = cfg,
745 base = base,
746 loop = loop,
747 event = event,
748 addevent = newevent,
749 addserver = addserver,
750 addclient = addclient,
751 wrapclient = wrapclient,
752 closeallservers = closeallservers,
753
754 __NAME = SCRIPT_NAME,
755 __DATE = LAST_MODIFIED,
756 __AUTHOR = SCRIPT_AUTHOR,
757 __VERSION = SCRIPT_VERSION,
758
759 }