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comparison: net/server_event.lua

net/server_event.lua

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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 -- to do some of the above, use timeout events or something what will called from outside
10 -- dont let garbagecollect eventcallbacks, as long they are running
11 -- when using luasec, there are 4 cases of timeout errors: wantread or wantwrite during reading or writing
12
13 --]]
14
15 local SCRIPT_NAME = "server_event.lua"
16 local SCRIPT_VERSION = "0.05"
17 local SCRIPT_AUTHOR = "blastbeat"
18 local LAST_MODIFIED = "2009/11/20"
19
20 local cfg = {
21 MAX_CONNECTIONS = 100000, -- max per server connections (use "ulimit -n" on *nix)
22 MAX_HANDSHAKE_ATTEMPTS= 1000, -- attempts to finish ssl handshake
23 HANDSHAKE_TIMEOUT = 60, -- timeout in seconds per handshake attempt
24 MAX_READ_LENGTH = 1024 * 1024 * 1024 * 1024, -- max bytes allowed to read from sockets
25 MAX_SEND_LENGTH = 1024 * 1024 * 1024 * 1024, -- max bytes size of write buffer (for writing on sockets)
26 ACCEPT_QUEUE = 128, -- might influence the length of the pending sockets queue
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
33 }
34
35 local function use(x) return rawget(_G, x); end
36 local ipairs = use "ipairs"
37 local string = use "string"
38 local select = use "select"
39 local require = use "require"
40 local tostring = use "tostring"
41 local coroutine = use "coroutine"
42 local setmetatable = use "setmetatable"
43
44 local t_insert = table.insert
45 local t_concat = table.concat
46
47 local has_luasec, ssl = pcall ( require , "ssl" )
48 local socket = use "socket" or require "socket"
49 local getaddrinfo = socket.dns.getaddrinfo
50
51 local log = require ("util.logger").init("socket")
52
53 local function debug(...)
54 return log("debug", ("%s "):rep(select('#', ...)), ...)
55 end
56 local vdebug = debug;
57
58 local bitor = ( function( ) -- thx Rici Lake
59 local hasbit = function( x, p )
60 return x % ( p + p ) >= p
61 end
62 return function( x, y )
63 local p = 1
64 local z = 0
65 local limit = x > y and x or y
66 while p <= limit do
67 if hasbit( x, p ) or hasbit( y, p ) then
68 z = z + p
69 end
70 p = p + p
71 end
72 return z
73 end
74 end )( )
75
76 local event = require "luaevent.core"
77 local base = event.new( )
78 local EV_READ = event.EV_READ
79 local EV_WRITE = event.EV_WRITE
80 local EV_TIMEOUT = event.EV_TIMEOUT
81 local EV_SIGNAL = event.EV_SIGNAL
82
83 local EV_READWRITE = bitor( EV_READ, EV_WRITE )
84
85 local interfacelist = ( function( ) -- holds the interfaces for sockets
86 local array = { }
87 local len = 0
88 return function( method, arg )
89 if "add" == method then
90 len = len + 1
91 array[ len ] = arg
92 arg:_position( len )
93 return len
94 elseif "delete" == method then
95 if len <= 0 then
96 return nil, "array is already empty"
97 end
98 local position = arg:_position() -- get position in array
99 if position ~= len then
100 local interface = array[ len ] -- get last interface
101 array[ position ] = interface -- copy it into free position
102 array[ len ] = nil -- free last position
103 interface:_position( position ) -- set new position in array
104 else -- free last position
105 array[ len ] = nil
106 end
107 len = len - 1
108 return len
109 else
110 return array
111 end
112 end
113 end )( )
114
115 -- Client interface methods
116 local interface_mt
117 do
118 interface_mt = {}; interface_mt.__index = interface_mt;
119
120 local addevent = base.addevent
121 local coroutine_wrap, coroutine_yield = coroutine.wrap,coroutine.yield
122
123 -- Private methods
124 function interface_mt:_position(new_position)
125 self.position = new_position or self.position
126 return self.position;
127 end
128 function interface_mt:_close()
129 return self:_destroy();
130 end
131
132 function interface_mt:_start_connection(plainssl) -- called from wrapclient
133 local callback = function( event )
134 if EV_TIMEOUT == event then -- timeout during connection
135 self.fatalerror = "connection timeout"
136 self:ontimeout() -- call timeout listener
137 self:_close()
138 debug( "new connection failed. id:", self.id, "error:", self.fatalerror )
139 else
140 if plainssl and has_luasec then -- start ssl session
141 self:starttls(self._sslctx, true)
142 else -- normal connection
143 self:_start_session(true)
144 end
145 debug( "new connection established. id:", self.id )
146 end
147 self.eventconnect = nil
148 return -1
149 end
150 self.eventconnect = addevent( base, self.conn, EV_WRITE, callback, cfg.CONNECT_TIMEOUT )
151 return true
152 end
153 function interface_mt:_start_session(call_onconnect) -- new session, for example after startssl
154 if self.type == "client" then
155 local callback = function( )
156 self:_lock( false, false, false )
157 --vdebug( "start listening on client socket with id:", self.id )
158 self.eventread = addevent( base, self.conn, EV_READ, self.readcallback, cfg.READ_TIMEOUT ); -- register callback
159 if call_onconnect then
160 self:onconnect()
161 end
162 self.eventsession = nil
163 return -1
164 end
165 self.eventsession = addevent( base, nil, EV_TIMEOUT, callback, 0 )
166 else
167 self:_lock( false )
168 --vdebug( "start listening on server socket with id:", self.id )
169 self.eventread = addevent( base, self.conn, EV_READ, self.readcallback ) -- register callback
170 end
171 return true
172 end
173 function interface_mt:_start_ssl(call_onconnect) -- old socket will be destroyed, therefore we have to close read/write events first
174 --vdebug( "starting ssl session with client id:", self.id )
175 local _
176 _ = self.eventread and self.eventread:close( ) -- close events; this must be called outside of the event callbacks!
177 _ = self.eventwrite and self.eventwrite:close( )
178 self.eventread, self.eventwrite = nil, nil
179 local err
180 self.conn, err = ssl.wrap( self.conn, self._sslctx )
181 if err then
182 self.fatalerror = err
183 self.conn = nil -- cannot be used anymore
184 if call_onconnect then
185 self.ondisconnect = nil -- dont call this when client isnt really connected
186 end
187 self:_close()
188 debug( "fatal error while ssl wrapping:", err )
189 return false
190 end
191 self.conn:settimeout( 0 ) -- set non blocking
192 local handshakecallback = coroutine_wrap(
193 function( event )
194 local _, err
195 local attempt = 0
196 local maxattempt = cfg.MAX_HANDSHAKE_ATTEMPTS
197 while attempt < maxattempt do -- no endless loop
198 attempt = attempt + 1
199 debug( "ssl handshake of client with id:"..tostring(self)..", attempt:"..attempt )
200 if attempt > maxattempt then
201 self.fatalerror = "max handshake attempts exceeded"
202 elseif EV_TIMEOUT == event then
203 self.fatalerror = "timeout during handshake"
204 else
205 _, err = self.conn:dohandshake( )
206 if not err then
207 self:_lock( false, false, false ) -- unlock the interface; sending, closing etc allowed
208 self.send = self.conn.send -- caching table lookups with new client object
209 self.receive = self.conn.receive
210 if not call_onconnect then -- trigger listener
211 self:onstatus("ssl-handshake-complete");
212 end
213 self:_start_session( call_onconnect )
214 debug( "ssl handshake done" )
215 self.eventhandshake = nil
216 return -1
217 end
218 if err == "wantwrite" then
219 event = EV_WRITE
220 elseif err == "wantread" then
221 event = EV_READ
222 else
223 debug( "ssl handshake error:", err )
224 self.fatalerror = err
225 end
226 end
227 if self.fatalerror then
228 if call_onconnect then
229 self.ondisconnect = nil -- dont call this when client isnt really connected
230 end
231 self:_close()
232 debug( "handshake failed because:", self.fatalerror )
233 self.eventhandshake = nil
234 return -1
235 end
236 event = coroutine_yield( event, cfg.HANDSHAKE_TIMEOUT ) -- yield this monster...
237 end
238 end
239 )
240 debug "starting handshake..."
241 self:_lock( false, true, true ) -- unlock read/write events, but keep interface locked
242 self.eventhandshake = addevent( base, self.conn, EV_READWRITE, handshakecallback, cfg.HANDSHAKE_TIMEOUT )
243 return true
244 end
245 function interface_mt:_destroy() -- close this interface + events and call last listener
246 debug( "closing client with id:", self.id, self.fatalerror )
247 self:_lock( true, true, true ) -- first of all, lock the interface to avoid further actions
248 local _
249 _ = self.eventread and self.eventread:close( )
250 if self.type == "client" then
251 _ = self.eventwrite and self.eventwrite:close( )
252 _ = self.eventhandshake and self.eventhandshake:close( )
253 _ = self.eventstarthandshake and self.eventstarthandshake:close( )
254 _ = self.eventconnect and self.eventconnect:close( )
255 _ = self.eventsession and self.eventsession:close( )
256 _ = self.eventwritetimeout and self.eventwritetimeout:close( )
257 _ = self.eventreadtimeout and self.eventreadtimeout:close( )
258 _ = 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)
259 _ = self.conn and self.conn:close( ) -- close connection
260 _ = self._server and self._server:counter(-1);
261 self.eventread, self.eventwrite = nil, nil
262 self.eventstarthandshake, self.eventhandshake, self.eventclose = nil, nil, nil
263 self.readcallback, self.writecallback = nil, nil
264 else
265 self.conn:close( )
266 self.eventread, self.eventclose = nil, nil
267 self.interface, self.readcallback = nil, nil
268 end
269 interfacelist( "delete", self )
270 return true
271 end
272
273 function interface_mt:_lock(nointerface, noreading, nowriting) -- lock or unlock this interface or events
274 self.nointerface, self.noreading, self.nowriting = nointerface, noreading, nowriting
275 return nointerface, noreading, nowriting
276 end
277
278 --TODO: Deprecate
279 function interface_mt:lock_read(switch)
280 if switch then
281 return self:pause();
282 else
283 return self:resume();
284 end
285 end
286
287 function interface_mt:pause()
288 return self:_lock(self.nointerface, true, self.nowriting);
289 end
290
291 function interface_mt:resume()
292 self:_lock(self.nointerface, false, self.nowriting);
293 if not self.eventread then
294 self.eventread = addevent( base, self.conn, EV_READ, self.readcallback, cfg.READ_TIMEOUT ); -- register callback
295 end
296 end
297
298 function interface_mt:counter(c)
299 if c then
300 self._connections = self._connections + c
301 end
302 return self._connections
303 end
304
305 -- Public methods
306 function interface_mt:write(data)
307 if self.nowriting then return nil, "locked" end
308 --vdebug( "try to send data to client, id/data:", self.id, data )
309 data = tostring( data )
310 local len = #data
311 local total = len + self.writebufferlen
312 if total > cfg.MAX_SEND_LENGTH then -- check buffer length
313 local err = "send buffer exceeded"
314 debug( "error:", err ) -- to much, check your app
315 return nil, err
316 end
317 t_insert(self.writebuffer, data) -- new buffer
318 self.writebufferlen = total
319 if not self.eventwrite then -- register new write event
320 --vdebug( "register new write event" )
321 self.eventwrite = addevent( base, self.conn, EV_WRITE, self.writecallback, cfg.WRITE_TIMEOUT )
322 end
323 return true
324 end
325 function interface_mt:close()
326 if self.nointerface then return nil, "locked"; end
327 debug( "try to close client connection with id:", self.id )
328 if self.type == "client" then
329 self.fatalerror = "client to close"
330 if self.eventwrite then -- wait for incomplete write request
331 self:_lock( true, true, false )
332 debug "closing delayed until writebuffer is empty"
333 return nil, "writebuffer not empty, waiting"
334 else -- close now
335 self:_lock( true, true, true )
336 self:_close()
337 return true
338 end
339 else
340 debug( "try to close server with id:", tostring(self.id))
341 self.fatalerror = "server to close"
342 self:_lock( true )
343 self:_close( 0 )
344 return true
345 end
346 end
347
348 function interface_mt:socket()
349 return self.conn
350 end
351
352 function interface_mt:server()
353 return self._server or self;
354 end
355
356 function interface_mt:port()
357 return self._port
358 end
359
360 function interface_mt:serverport()
361 return self._serverport
362 end
363
364 function interface_mt:ip()
365 return self._ip
366 end
367
368 function interface_mt:ssl()
369 return self._usingssl
370 end
371 interface_mt.clientport = interface_mt.port -- COMPAT server_select
372
373 function interface_mt:type()
374 return self._type or "client"
375 end
376
377 function interface_mt:connections()
378 return self._connections
379 end
380
381 function interface_mt:address()
382 return self.addr
383 end
384
385 function interface_mt:set_sslctx(sslctx)
386 self._sslctx = sslctx;
387 if sslctx then
388 self.starttls = nil; -- use starttls() of interface_mt
389 else
390 self.starttls = false; -- prevent starttls()
391 end
392 end
393
394 function interface_mt:set_mode(pattern)
395 if pattern then
396 self._pattern = pattern;
397 end
398 return self._pattern;
399 end
400
401 function interface_mt:set_send(new_send)
402 -- No-op, we always use the underlying connection's send
403 end
404
405 function interface_mt:starttls(sslctx, call_onconnect)
406 debug( "try to start ssl at client id:", self.id )
407 local err
408 self._sslctx = sslctx;
409 if self._usingssl then -- startssl was already called
410 err = "ssl already active"
411 end
412 if err then
413 debug( "error:", err )
414 return nil, err
415 end
416 self._usingssl = true
417 self.startsslcallback = function( ) -- we have to start the handshake outside of a read/write event
418 self.startsslcallback = nil
419 self:_start_ssl(call_onconnect);
420 self.eventstarthandshake = nil
421 return -1
422 end
423 if not self.eventwrite then
424 self:_lock( true, true, true ) -- lock the interface, to not disturb the handshake
425 self.eventstarthandshake = addevent( base, nil, EV_TIMEOUT, self.startsslcallback, 0 ) -- add event to start handshake
426 else -- wait until writebuffer is empty
427 self:_lock( true, true, false )
428 debug "ssl session delayed until writebuffer is empty..."
429 end
430 self.starttls = false;
431 return true
432 end
433
434 function interface_mt:setoption(option, value)
435 if self.conn.setoption then
436 return self.conn:setoption(option, value);
437 end
438 return false, "setoption not implemented";
439 end
440
441 function interface_mt:setlistener(listener)
442 self:ondetach(); -- Notify listener that it is no longer responsible for this connection
443 self.onconnect, self.ondisconnect, self.onincoming, self.ontimeout,
444 self.onreadtimeout, self.onstatus, self.ondetach
445 = listener.onconnect, listener.ondisconnect, listener.onincoming, listener.ontimeout,
446 listener.onreadtimeout, listener.onstatus, listener.ondetach;
447 end
448
449 -- Stub handlers
450 function interface_mt:onconnect()
451 end
452 function interface_mt:onincoming()
453 end
454 function interface_mt:ondisconnect()
455 end
456 function interface_mt:ontimeout()
457 end
458 function interface_mt:onreadtimeout()
459 self.fatalerror = "timeout during receiving"
460 debug( "connection failed:", self.fatalerror )
461 self:_close()
462 self.eventread = nil
463 end
464 function interface_mt:ondrain()
465 end
466 function interface_mt:ondetach()
467 end
468 function interface_mt:onstatus()
469 end
470 end
471
472 -- End of client interface methods
473
474 local handleclient;
475 do
476 local string_sub = string.sub -- caching table lookups
477 local addevent = base.addevent
478 local socket_gettime = socket.gettime
479 function handleclient( client, ip, port, server, pattern, listener, sslctx ) -- creates an client interface
480 --vdebug("creating client interfacce...")
481 local interface = {
482 type = "client";
483 conn = client;
484 currenttime = socket_gettime( ); -- safe the origin
485 writebuffer = {}; -- writebuffer
486 writebufferlen = 0; -- length of writebuffer
487 send = client.send; -- caching table lookups
488 receive = client.receive;
489 onconnect = listener.onconnect; -- will be called when client disconnects
490 ondisconnect = listener.ondisconnect; -- will be called when client disconnects
491 onincoming = listener.onincoming; -- will be called when client sends data
492 ontimeout = listener.ontimeout; -- called when fatal socket timeout occurs
493 onreadtimeout = listener.onreadtimeout; -- called when socket inactivity timeout occurs
494 ondrain = listener.ondrain; -- called when writebuffer is empty
495 ondetach = listener.ondetach; -- called when disassociating this listener from this connection
496 onstatus = listener.onstatus; -- called for status changes (e.g. of SSL/TLS)
497 eventread = false, eventwrite = false, eventclose = false,
498 eventhandshake = false, eventstarthandshake = false; -- event handler
499 eventconnect = false, eventsession = false; -- more event handler...
500 eventwritetimeout = false; -- even more event handler...
501 eventreadtimeout = false;
502 fatalerror = false; -- error message
503 writecallback = false; -- will be called on write events
504 readcallback = false; -- will be called on read events
505 nointerface = true; -- lock/unlock parameter of this interface
506 noreading = false, nowriting = false; -- locks of the read/writecallback
507 startsslcallback = false; -- starting handshake callback
508 position = false; -- position of client in interfacelist
509
510 -- Properties
511 _ip = ip, _port = port, _server = server, _pattern = pattern,
512 _serverport = (server and server:port() or nil),
513 _sslctx = sslctx; -- parameters
514 _usingssl = false; -- client is using ssl;
515 }
516 if not has_luasec then interface.starttls = false; end
517 interface.id = tostring(interface):match("%x+$");
518 interface.writecallback = function( event ) -- called on write events
519 --vdebug( "new client write event, id/ip/port:", interface, ip, port )
520 if interface.nowriting or ( interface.fatalerror and ( "client to close" ~= interface.fatalerror ) ) then -- leave this event
521 --vdebug( "leaving this event because:", interface.nowriting or interface.fatalerror )
522 interface.eventwrite = false
523 return -1
524 end
525 if EV_TIMEOUT == event then -- took too long to write some data to socket -> disconnect
526 interface.fatalerror = "timeout during writing"
527 debug( "writing failed:", interface.fatalerror )
528 interface:_close()
529 interface.eventwrite = false
530 return -1
531 else -- can write :)
532 if interface._usingssl then -- handle luasec
533 if interface.eventreadtimeout then -- we have to read first
534 local ret = interface.readcallback( ) -- call readcallback
535 --vdebug( "tried to read in writecallback, result:", ret )
536 end
537 if interface.eventwritetimeout then -- luasec only
538 interface.eventwritetimeout:close( ) -- first we have to close timeout event which where regged after a wantread error
539 interface.eventwritetimeout = false
540 end
541 end
542 interface.writebuffer = { t_concat(interface.writebuffer) }
543 local succ, err, byte = interface.conn:send( interface.writebuffer[1], 1, interface.writebufferlen )
544 --vdebug( "write data:", interface.writebuffer, "error:", err, "part:", byte )
545 if succ then -- writing succesful
546 interface.writebuffer[1] = nil
547 interface.writebufferlen = 0
548 interface:ondrain();
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
557 end
558 interface.eventwrite = nil
559 return -1
560 elseif byte and (err == "timeout" or err == "wantwrite") then -- want write again
561 --vdebug( "writebuffer is not empty:", err )
562 interface.writebuffer[1] = string_sub( interface.writebuffer[1], 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( )
566 interface:_close()
567 interface.eventwritetimeout = nil
568 return -1;
569 end
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
573 return -1
574 end
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 )
579 interface:_close()
580 interface.eventwrite = nil
581 return -1
582 end
583 end
584 end
585
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
591 return -1
592 end
593 if EV_TIMEOUT == event and interface:onreadtimeout() ~= true then
594 return -1 -- took too long to get some data from client -> disconnect
595 end
596 if interface._usingssl then -- handle luasec
597 if interface.eventwritetimeout then -- ok, in the past writecallback was regged
598 local ret = interface.writecallback( ) -- call it
599 --vdebug( "tried to write in readcallback, result:", tostring(ret) )
600 end
601 if interface.eventreadtimeout then
602 interface.eventreadtimeout:close( )
603 interface.eventreadtimeout = nil
604 end
605 end
606 local buffer, err, part = interface.conn:receive( interface._pattern ) -- receive buffer with "pattern"
607 --vdebug( "read data:", tostring(buffer), "error:", tostring(err), "part:", tostring(part) )
608 buffer = buffer or part
609 if buffer and #buffer > cfg.MAX_READ_LENGTH then -- check buffer length
610 interface.fatalerror = "receive buffer exceeded"
611 debug( "fatal error:", interface.fatalerror )
612 interface:_close()
613 interface.eventread = nil
614 return -1
615 end
616 if err and ( err ~= "timeout" and err ~= "wantread" ) then
617 if "wantwrite" == err then -- need to read on write event
618 if not interface.eventwrite then -- register new write event if needed
619 interface.eventwrite = addevent( base, interface.conn, EV_WRITE, interface.writecallback, cfg.WRITE_TIMEOUT )
620 end
621 interface.eventreadtimeout = addevent( base, nil, EV_TIMEOUT,
622 function( )
623 interface:_close()
624 end, cfg.READ_TIMEOUT
625 )
626 debug( "wantwrite during read attempt, reg it in writecallback but dont know what really happens next..." )
627 -- to be honest i dont know what happens next, if it is allowed to first read, the write etc...
628 else -- connection was closed or fatal error
629 interface.fatalerror = err
630 debug( "connection failed in read event:", interface.fatalerror )
631 interface:_close()
632 interface.eventread = nil
633 return -1
634 end
635 else
636 interface.onincoming( interface, buffer, err ) -- send new data to listener
637 end
638 if interface.noreading then
639 interface.eventread = nil;
640 return -1;
641 end
642 return EV_READ, cfg.READ_TIMEOUT
643 end
644
645 client:settimeout( 0 ) -- set non blocking
646 setmetatable(interface, interface_mt)
647 interfacelist( "add", interface ) -- add to interfacelist
648 return interface
649 end
650 end
651
652 local handleserver
653 do
654 function handleserver( server, addr, port, pattern, listener, sslctx ) -- creates an server interface
655 debug "creating server interface..."
656 local interface = {
657 _connections = 0;
658
659 conn = server;
660 onconnect = listener.onconnect; -- will be called when new client connected
661 eventread = false; -- read event handler
662 eventclose = false; -- close event handler
663 readcallback = false; -- read event callback
664 fatalerror = false; -- error message
665 nointerface = true; -- lock/unlock parameter
666
667 _ip = addr, _port = port, _pattern = pattern,
668 _sslctx = sslctx;
669 }
670 interface.id = tostring(interface):match("%x+$");
671 interface.readcallback = function( event ) -- server handler, called on incoming connections
672 --vdebug( "server can accept, id/addr/port:", interface, addr, port )
673 if interface.fatalerror then
674 --vdebug( "leaving this event because:", self.fatalerror )
675 interface.eventread = nil
676 return -1
677 end
678 local delay = cfg.ACCEPT_DELAY
679 if EV_TIMEOUT == event then
680 if interface._connections >= cfg.MAX_CONNECTIONS then -- check connection count
681 debug( "to many connections, seconds to wait for next accept:", delay )
682 return EV_TIMEOUT, delay -- timeout...
683 else
684 return EV_READ -- accept again
685 end
686 end
687 --vdebug("max connection check ok, accepting...")
688 local client, err = server:accept() -- try to accept; TODO: check err
689 while client do
690 if interface._connections >= cfg.MAX_CONNECTIONS then
691 client:close( ) -- refuse connection
692 debug( "maximal connections reached, refuse client connection; accept delay:", delay )
693 return EV_TIMEOUT, delay -- delay for next accept attempt
694 end
695 local client_ip, client_port = client:getpeername( )
696 interface._connections = interface._connections + 1 -- increase connection count
697 local clientinterface = handleclient( client, client_ip, client_port, interface, pattern, listener, sslctx )
698 --vdebug( "client id:", clientinterface, "startssl:", startssl )
699 if has_luasec and sslctx then
700 clientinterface:starttls(sslctx, true)
701 else
702 clientinterface:_start_session( true )
703 end
704 debug( "accepted incoming client connection from:", client_ip or "<unknown IP>", client_port or "<unknown port>", "to", port or "<unknown port>");
705
706 client, err = server:accept() -- try to accept again
707 end
708 return EV_READ
709 end
710
711 server:settimeout( 0 )
712 setmetatable(interface, interface_mt)
713 interfacelist( "add", interface )
714 interface:_start_session()
715 return interface
716 end
717 end
718
719 local addserver = ( function( )
720 return function( addr, port, listener, pattern, sslctx, startssl ) -- TODO: check arguments
721 --vdebug( "creating new tcp server with following parameters:", addr or "nil", port or "nil", sslctx or "nil", startssl or "nil")
722 if sslctx and not has_luasec then
723 debug "fatal error: luasec not found"
724 return nil, "luasec not found"
725 end
726 local server, err = socket.bind( addr, port, cfg.ACCEPT_QUEUE ) -- create server socket
727 if not server then
728 debug( "creating server socket on "..addr.." port "..port.." failed:", err )
729 return nil, err
730 end
731 local interface = handleserver( server, addr, port, pattern, listener, sslctx, startssl ) -- new server handler
732 debug( "new server created with id:", tostring(interface))
733 return interface
734 end
735 end )( )
736
737 local addclient, wrapclient
738 do
739 function wrapclient( client, ip, port, listeners, pattern, sslctx )
740 local interface = handleclient( client, ip, port, nil, pattern, listeners, sslctx )
741 interface:_start_connection(sslctx)
742 return interface, client
743 --function handleclient( client, ip, port, server, pattern, listener, _, sslctx ) -- creates an client interface
744 end
745
746 function addclient( addr, serverport, listener, pattern, sslctx, typ )
747 if sslctx and not has_luasec then
748 debug "need luasec, but not available"
749 return nil, "luasec not found"
750 end
751 if getaddrinfo and not typ then
752 local addrinfo, err = getaddrinfo(addr)
753 if not addrinfo then return nil, err end
754 if addrinfo[1] and addrinfo[1].family == "inet6" then
755 typ = "tcp6"
756 end
757 end
758 local create = socket[typ or "tcp"]
759 if type( create ) ~= "function" then
760 return nil, "invalid socket type"
761 end
762 local client, err = create() -- creating new socket
763 if not client then
764 debug( "cannot create socket:", err )
765 return nil, err
766 end
767 client:settimeout( 0 ) -- set nonblocking
768 local res, err = client:connect( addr, serverport ) -- connect
769 if res or ( err == "timeout" or err == "Operation already in progress" ) then
770 if client.getsockname then
771 addr = client:getsockname( )
772 end
773 local interface = wrapclient( client, addr, serverport, listener, pattern, sslctx )
774 debug( "new connection id:", interface.id )
775 return interface, err
776 else
777 debug( "new connection failed:", err )
778 return nil, err
779 end
780 end
781 end
782
783
784 local loop = function( ) -- starts the event loop
785 base:loop( )
786 return "quitting";
787 end
788
789 local newevent = ( function( )
790 local add = base.addevent
791 return function( ... )
792 return add( base, ... )
793 end
794 end )( )
795
796 local closeallservers = function( arg )
797 for _, item in ipairs( interfacelist( ) ) do
798 if item.type == "server" then
799 item:close( arg )
800 end
801 end
802 end
803
804 local function setquitting(yes)
805 if yes then
806 -- Quit now
807 closeallservers();
808 base:loopexit();
809 end
810 end
811
812 local function get_backend()
813 return base:method();
814 end
815
816 -- We need to hold onto the events to stop them
817 -- being garbage-collected
818 local signal_events = {}; -- [signal_num] -> event object
819 local function hook_signal(signal_num, handler)
820 local function _handler(event)
821 local ret = handler();
822 if ret ~= false then -- Continue handling this signal?
823 return EV_SIGNAL; -- Yes
824 end
825 return -1; -- Close this event
826 end
827 signal_events[signal_num] = base:addevent(signal_num, EV_SIGNAL, _handler);
828 return signal_events[signal_num];
829 end
830
831 local function link(sender, receiver, buffersize)
832 local sender_locked;
833
834 function receiver:ondrain()
835 if sender_locked then
836 sender:resume();
837 sender_locked = nil;
838 end
839 end
840
841 function sender:onincoming(data)
842 receiver:write(data);
843 if receiver.writebufferlen >= buffersize then
844 sender_locked = true;
845 sender:pause();
846 end
847 end
848 sender:set_mode("*a");
849 end
850
851 local add_task do
852 local EVENT_LEAVE = (event.core and event.core.LEAVE) or -1;
853 local socket_gettime = socket.gettime
854 function add_task(delay, callback)
855 local event_handle;
856 event_handle = base:addevent(nil, 0, function ()
857 local ret = callback(socket_gettime());
858 if ret then
859 return 0, ret;
860 elseif event_handle then
861 return EVENT_LEAVE;
862 end
863 end
864 , delay);
865 end
866 end
867
868 return {
869
870 cfg = cfg,
871 base = base,
872 loop = loop,
873 link = link,
874 event = event,
875 event_base = base,
876 addevent = newevent,
877 addserver = addserver,
878 addclient = addclient,
879 wrapclient = wrapclient,
880 setquitting = setquitting,
881 closeall = closeallservers,
882 get_backend = get_backend,
883 hook_signal = hook_signal,
884 add_task = add_task,
885
886 __NAME = SCRIPT_NAME,
887 __DATE = LAST_MODIFIED,
888 __AUTHOR = SCRIPT_AUTHOR,
889 __VERSION = SCRIPT_VERSION,
890
891 }

Mercurial Repository: mjpegproxy

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