net/server_select.lua

   1 --
   2 -- server.lua by blastbeat of the luadch project
   3 -- Re-used here under the MIT/X Consortium License
   4 --
   5 -- Modifications (C) 2008-2010 Matthew Wild, Waqas Hussain
   6 --
   7
   8 -- // wrapping luadch stuff // --
   9
  10 local use = function( what )
  11         return _G[ what ]
  12 end
  13
  14 local log, table_concat = require ("util.logger").init("socket"), table.concat;
  15 local out_put = function (...) return log("debug", table_concat{...}); end
  16 local out_error = function (...) return log("warn", table_concat{...}); end
  17
  18 ----------------------------------// DECLARATION //--
  19
  20 --// constants //--
  21
  22 local STAT_UNIT = 1 -- byte
  23
  24 --// lua functions //--
  25
  26 local type = use "type"
  27 local pairs = use "pairs"
  28 local ipairs = use "ipairs"
  29 local tonumber = use "tonumber"
  30 local tostring = use "tostring"
  31
  32 --// lua libs //--
  33
  34 local os = use "os"
  35 local table = use "table"
  36 local string = use "string"
  37 local coroutine = use "coroutine"
  38
  39 --// lua lib methods //--
  40
  41 local os_difftime = os.difftime
  42 local math_min = math.min
  43 local math_huge = math.huge
  44 local table_concat = table.concat
  45 local string_sub = string.sub
  46 local coroutine_wrap = coroutine.wrap
  47 local coroutine_yield = coroutine.yield
  48
  49 --// extern libs //--
  50
  51 local has_luasec, luasec = pcall ( require , "ssl" )
  52 local luasocket = use "socket" or require "socket"
  53 local luasocket_gettime = luasocket.gettime
  54
  55 --// extern lib methods //--
  56
  57 local ssl_wrap = ( has_luasec and luasec.wrap )
  58 local socket_bind = luasocket.bind
  59 local socket_sleep = luasocket.sleep
  60 local socket_select = luasocket.select
  61
  62 --// functions //--
  63
  64 local id
  65 local loop
  66 local stats
  67 local idfalse
  68 local closeall
  69 local addsocket
  70 local addserver
  71 local addtimer
  72 local getserver
  73 local wrapserver
  74 local getsettings
  75 local closesocket
  76 local removesocket
  77 local removeserver
  78 local wrapconnection
  79 local changesettings
  80
  81 --// tables //--
  82
  83 local _server
  84 local _readlist
  85 local _timerlist
  86 local _sendlist
  87 local _socketlist
  88 local _closelist
  89 local _readtimes
  90 local _writetimes
  91
  92 --// simple data types //--
  93
  94 local _
  95 local _readlistlen
  96 local _sendlistlen
  97 local _timerlistlen
  98
  99 local _sendtraffic
 100 local _readtraffic
 101
 102 local _selecttimeout
 103 local _sleeptime
 104 local _tcpbacklog
 105
 106 local _starttime
 107 local _currenttime
 108
 109 local _maxsendlen
 110 local _maxreadlen
 111
 112 local _checkinterval
 113 local _sendtimeout
 114 local _readtimeout
 115
 116 local _timer
 117
 118 local _maxselectlen
 119 local _maxfd
 120
 121 local _maxsslhandshake
 122
 123 ----------------------------------// DEFINITION //--
 124
 125 _server = { } -- key = port, value = table; list of listening servers
 126 _readlist = { } -- array with sockets to read from
 127 _sendlist = { } -- arrary with sockets to write to
 128 _timerlist = { } -- array of timer functions
 129 _socketlist = { } -- key = socket, value = wrapped socket (handlers)
 130 _readtimes = { } -- key = handler, value = timestamp of last data reading
 131 _writetimes = { } -- key = handler, value = timestamp of last data writing/sending
 132 _closelist = { } -- handlers to close
 133
 134 _readlistlen = 0 -- length of readlist
 135 _sendlistlen = 0 -- length of sendlist
 136 _timerlistlen = 0 -- lenght of timerlist
 137
 138 _sendtraffic = 0 -- some stats
 139 _readtraffic = 0
 140
 141 _selecttimeout = 1 -- timeout of socket.select
 142 _sleeptime = 0 -- time to wait at the end of every loop
 143 _tcpbacklog = 128 -- some kind of hint to the OS
 144
 145 _maxsendlen = 51000 * 1024 -- max len of send buffer
 146 _maxreadlen = 25000 * 1024 -- max len of read buffer
 147
 148 _checkinterval = 30 -- interval in secs to check idle clients
 149 _sendtimeout = 60000 -- allowed send idle time in secs
 150 _readtimeout = 6 * 60 * 60 -- allowed read idle time in secs
 151
 152 local is_windows = package.config:sub(1,1) == "\\" -- check the directory separator, to detemine whether this is Windows
 153 _maxfd = (is_windows and math.huge) or luasocket._SETSIZE or 1024 -- max fd number, limit to 1024 by default to prevent glibc buffer overflow, but not on Windows
 154 _maxselectlen = luasocket._SETSIZE or 1024 -- But this still applies on Windows
 155
 156 _maxsslhandshake = 30 -- max handshake round-trips
 157
 158 ----------------------------------// PRIVATE //--
 159
 160 wrapserver = function( listeners, socket, ip, serverport, pattern, sslctx ) -- this function wraps a server -- FIXME Make sure FD < _maxfd
 161
 162         if socket:getfd() >= _maxfd then
 163                 out_error("server.lua: Disallowed FD number: "..socket:getfd())
 164                 socket:close()
 165                 return nil, "fd-too-large"
 166         end
 167
 168         local connections = 0
 169
 170         local dispatch, disconnect = listeners.onconnect, listeners.ondisconnect
 171
 172         local accept = socket.accept
 173
 174         --// public methods of the object //--
 175
 176         local handler = { }
 177
 178         handler.shutdown = function( ) end
 179
 180         handler.ssl = function( )
 181                 return sslctx ~= nil
 182         end
 183         handler.sslctx = function( )
 184                 return sslctx
 185         end
 186         handler.remove = function( )
 187                 connections = connections - 1
 188                 if handler then
 189                         handler.resume( )
 190                 end
 191         end
 192         handler.close = function()
 193                 socket:close( )
 194                 _sendlistlen = removesocket( _sendlist, socket, _sendlistlen )
 195                 _readlistlen = removesocket( _readlist, socket, _readlistlen )
 196                 _server[ip..":"..serverport] = nil;
 197                 _socketlist[ socket ] = nil
 198                 handler = nil
 199                 socket = nil
 200                 --mem_free( )
 201                 out_put "server.lua: closed server handler and removed sockets from list"
 202         end
 203         handler.pause = function( hard )
 204                 if not handler.paused then
 205                         _readlistlen = removesocket( _readlist, socket, _readlistlen )
 206                         if hard then
 207                                 _socketlist[ socket ] = nil
 208                                 socket:close( )
 209                                 socket = nil;
 210                         end
 211                         handler.paused = true;
 212                 end
 213         end
 214         handler.resume = function( )
 215                 if handler.paused then
 216                         if not socket then
 217                                 socket = socket_bind( ip, serverport, _tcpbacklog );
 218                                 socket:settimeout( 0 )
 219                         end
 220                         _readlistlen = addsocket(_readlist, socket, _readlistlen)
 221                         _socketlist[ socket ] = handler
 222                         handler.paused = false;
 223                 end
 224         end
 225         handler.ip = function( )
 226                 return ip
 227         end
 228         handler.serverport = function( )
 229                 return serverport
 230         end
 231         handler.socket = function( )
 232                 return socket
 233         end
 234         handler.readbuffer = function( )
 235                 if _readlistlen >= _maxselectlen or _sendlistlen >= _maxselectlen then
 236                         handler.pause( )
 237                         out_put( "server.lua: refused new client connection: server full" )
 238                         return false
 239                 end
 240                 local client, err = accept( socket )    -- try to accept
 241                 if client then
 242                         local ip, clientport = client:getpeername( )
 243                         local handler, client, err = wrapconnection( handler, listeners, client, ip, serverport, clientport, pattern, sslctx ) -- wrap new client socket
 244                         if err then -- error while wrapping ssl socket
 245                                 return false
 246                         end
 247                         connections = connections + 1
 248                         out_put( "server.lua: accepted new client connection from ", tostring(ip), ":", tostring(clientport), " to ", tostring(serverport))
 249                         if dispatch and not sslctx then -- SSL connections will notify onconnect when handshake completes
 250                                 return dispatch( handler );
 251                         end
 252                         return;
 253                 elseif err then -- maybe timeout or something else
 254                         out_put( "server.lua: error with new client connection: ", tostring(err) )
 255                         return false
 256                 end
 257         end
 258         return handler
 259 end
 260
 261 wrapconnection = function( server, listeners, socket, ip, serverport, clientport, pattern, sslctx ) -- this function wraps a client to a handler object
 262
 263         if socket:getfd() >= _maxfd then
 264                 out_error("server.lua: Disallowed FD number: "..socket:getfd()) -- PROTIP: Switch to libevent
 265                 socket:close( ) -- Should we send some kind of error here?
 266                 if server then
 267                         server.pause( )
 268                 end
 269                 return nil, nil, "fd-too-large"
 270         end
 271         socket:settimeout( 0 )
 272
 273         --// local import of socket methods //--
 274
 275         local send
 276         local receive
 277         local shutdown
 278
 279         --// private closures of the object //--
 280
 281         local ssl
 282
 283         local dispatch = listeners.onincoming
 284         local status = listeners.onstatus
 285         local disconnect = listeners.ondisconnect
 286         local drain = listeners.ondrain
 287         local onreadtimeout = listeners.onreadtimeout;
 288         local detach = listeners.ondetach
 289
 290         local bufferqueue = { } -- buffer array
 291         local bufferqueuelen = 0        -- end of buffer array
 292
 293         local toclose
 294         local fatalerror
 295         local needtls
 296
 297         local bufferlen = 0
 298
 299         local noread = false
 300         local nosend = false
 301
 302         local sendtraffic, readtraffic = 0, 0
 303
 304         local maxsendlen = _maxsendlen
 305         local maxreadlen = _maxreadlen
 306
 307         --// public methods of the object //--
 308
 309         local handler = bufferqueue -- saves a table ^_^
 310
 311         handler.dispatch = function( )
 312                 return dispatch
 313         end
 314         handler.disconnect = function( )
 315                 return disconnect
 316         end
 317         handler.onreadtimeout = onreadtimeout;
 318
 319         handler.setlistener = function( self, listeners )
 320                 if detach then
 321                         detach(self) -- Notify listener that it is no longer responsible for this connection
 322                 end
 323                 dispatch = listeners.onincoming
 324                 disconnect = listeners.ondisconnect
 325                 status = listeners.onstatus
 326                 drain = listeners.ondrain
 327                 handler.onreadtimeout = listeners.onreadtimeout
 328                 detach = listeners.ondetach
 329         end
 330         handler.getstats = function( )
 331                 return readtraffic, sendtraffic
 332         end
 333         handler.ssl = function( )
 334                 return ssl
 335         end
 336         handler.sslctx = function ( )
 337                 return sslctx
 338         end
 339         handler.send = function( _, data, i, j )
 340                 return send( socket, data, i, j )
 341         end
 342         handler.receive = function( pattern, prefix )
 343                 return receive( socket, pattern, prefix )
 344         end
 345         handler.shutdown = function( pattern )
 346                 return shutdown( socket, pattern )
 347         end
 348         handler.setoption = function (self, option, value)
 349                 if socket.setoption then
 350                         return socket:setoption(option, value);
 351                 end
 352                 return false, "setoption not implemented";
 353         end
 354         handler.force_close = function ( self, err )
 355                 if bufferqueuelen ~= 0 then
 356                         out_put("server.lua: discarding unwritten data for ", tostring(ip), ":", tostring(clientport))
 357                         bufferqueuelen = 0;
 358                 end
 359                 return self:close(err);
 360         end
 361         handler.close = function( self, err )
 362                 if not handler then return true; end
 363                 _readlistlen = removesocket( _readlist, socket, _readlistlen )
 364                 _readtimes[ handler ] = nil
 365                 if bufferqueuelen ~= 0 then
 366                         handler.sendbuffer() -- Try now to send any outstanding data
 367                         if bufferqueuelen ~= 0 then -- Still not empty, so we'll try again later
 368                                 if handler then
 369                                         handler.write = nil -- ... but no further writing allowed
 370                                 end
 371                                 toclose = true
 372                                 return false
 373                         end
 374                 end
 375                 if socket then
 376                         _ = shutdown and shutdown( socket )
 377                         socket:close( )
 378                         _sendlistlen = removesocket( _sendlist, socket, _sendlistlen )
 379                         _socketlist[ socket ] = nil
 380                         socket = nil
 381                 else
 382                         out_put "server.lua: socket already closed"
 383                 end
 384                 if handler then
 385                         _writetimes[ handler ] = nil
 386                         _closelist[ handler ] = nil
 387                         local _handler = handler;
 388                         handler = nil
 389                         if disconnect then
 390                                 disconnect(_handler, err or false);
 391                                 disconnect = nil
 392                         end
 393                 end
 394                 if server then
 395                         server.remove( )
 396                 end
 397                 out_put "server.lua: closed client handler and removed socket from list"
 398                 return true
 399         end
 400         handler.ip = function( )
 401                 return ip
 402         end
 403         handler.serverport = function( )
 404                 return serverport
 405         end
 406         handler.clientport = function( )
 407                 return clientport
 408         end
 409         handler.port = handler.clientport -- COMPAT server_event
 410         local write = function( self, data )
 411                 bufferlen = bufferlen + #data
 412                 if bufferlen > maxsendlen then
 413                         _closelist[ handler ] = "send buffer exceeded"   -- cannot close the client at the moment, have to wait to the end of the cycle
 414                         handler.write = idfalse -- dont write anymore
 415                         return false
 416                 elseif socket and not _sendlist[ socket ] then
 417                         _sendlistlen = addsocket(_sendlist, socket, _sendlistlen)
 418                 end
 419                 bufferqueuelen = bufferqueuelen + 1
 420                 bufferqueue[ bufferqueuelen ] = data
 421                 if handler then
 422                         _writetimes[ handler ] = _writetimes[ handler ] or _currenttime
 423                 end
 424                 return true
 425         end
 426         handler.write = write
 427         handler.bufferqueue = function( self )
 428                 return bufferqueue
 429         end
 430         handler.socket = function( self )
 431                 return socket
 432         end
 433         handler.set_mode = function( self, new )
 434                 pattern = new or pattern
 435                 return pattern
 436         end
 437         handler.set_send = function ( self, newsend )
 438                 send = newsend or send
 439                 return send
 440         end
 441         handler.bufferlen = function( self, readlen, sendlen )
 442                 maxsendlen = sendlen or maxsendlen
 443                 maxreadlen = readlen or maxreadlen
 444                 return bufferlen, maxreadlen, maxsendlen
 445         end
 446         --TODO: Deprecate
 447         handler.lock_read = function (self, switch)
 448                 if switch == true then
 449                         local tmp = _readlistlen
 450                         _readlistlen = removesocket( _readlist, socket, _readlistlen )
 451                         _readtimes[ handler ] = nil
 452                         if _readlistlen ~= tmp then
 453                                 noread = true
 454                         end
 455                 elseif switch == false then
 456                         if noread then
 457                                 noread = false
 458                                 _readlistlen = addsocket(_readlist, socket, _readlistlen)
 459                                 _readtimes[ handler ] = _currenttime
 460                         end
 461                 end
 462                 return noread
 463         end
 464         handler.pause = function (self)
 465                 return self:lock_read(true);
 466         end
 467         handler.resume = function (self)
 468                 return self:lock_read(false);
 469         end
 470         handler.lock = function( self, switch )
 471                 handler.lock_read (switch)
 472                 if switch == true then
 473                         handler.write = idfalse
 474                         local tmp = _sendlistlen
 475                         _sendlistlen = removesocket( _sendlist, socket, _sendlistlen )
 476                         _writetimes[ handler ] = nil
 477                         if _sendlistlen ~= tmp then
 478                                 nosend = true
 479                         end
 480                 elseif switch == false then
 481                         handler.write = write
 482                         if nosend then
 483                                 nosend = false
 484                                 write( "" )
 485                         end
 486                 end
 487                 return noread, nosend
 488         end
 489         local _readbuffer = function( ) -- this function reads data
 490                 local buffer, err, part = receive( socket, pattern )    -- receive buffer with "pattern"
 491                 if not err or (err == "wantread" or err == "timeout") then -- received something
 492                         local buffer = buffer or part or ""
 493                         local len = #buffer
 494                         if len > maxreadlen then
 495                                 handler:close( "receive buffer exceeded" )
 496                                 return false
 497                         end
 498                         local count = len * STAT_UNIT
 499                         readtraffic = readtraffic + count
 500                         _readtraffic = _readtraffic + count
 501                         _readtimes[ handler ] = _currenttime
 502                         --out_put( "server.lua: read data '", buffer:gsub("[^%w%p ]", "."), "', error: ", err )
 503                         return dispatch( handler, buffer, err )
 504                 else    -- connections was closed or fatal error
 505                         out_put( "server.lua: client ", tostring(ip), ":", tostring(clientport), " read error: ", tostring(err) )
 506                         fatalerror = true
 507                         _ = handler and handler:force_close( err )
 508                         return false
 509                 end
 510         end
 511         local _sendbuffer = function( ) -- this function sends data
 512                 local succ, err, byte, buffer, count;
 513                 if socket then
 514                         buffer = table_concat( bufferqueue, "", 1, bufferqueuelen )
 515                         succ, err, byte = send( socket, buffer, 1, bufferlen )
 516                         count = ( succ or byte or 0 ) * STAT_UNIT
 517                         sendtraffic = sendtraffic + count
 518                         _sendtraffic = _sendtraffic + count
 519                         for i = bufferqueuelen,1,-1 do
 520                                 bufferqueue[ i ] = nil
 521                         end
 522                         --out_put( "server.lua: sended '", buffer, "', bytes: ", tostring(succ), ", error: ", tostring(err), ", part: ", tostring(byte), ", to: ", tostring(ip), ":", tostring(clientport) )
 523                 else
 524                         succ, err, count = false, "unexpected close", 0;
 525                 end
 526                 if succ then    -- sending succesful
 527                         bufferqueuelen = 0
 528                         bufferlen = 0
 529                         _sendlistlen = removesocket( _sendlist, socket, _sendlistlen ) -- delete socket from writelist
 530                         _writetimes[ handler ] = nil
 531                         if drain then
 532                                 drain(handler)
 533                         end
 534                         _ = needtls and handler:starttls(nil)
 535                         _ = toclose and handler:force_close( )
 536                         return true
 537                 elseif byte and ( err == "timeout" or err == "wantwrite" ) then -- want write
 538                         buffer = string_sub( buffer, byte + 1, bufferlen ) -- new buffer
 539                         bufferqueue[ 1 ] = buffer        -- insert new buffer in queue
 540                         bufferqueuelen = 1
 541                         bufferlen = bufferlen - byte
 542                         _writetimes[ handler ] = _currenttime
 543                         return true
 544                 else    -- connection was closed during sending or fatal error
 545                         out_put( "server.lua: client ", tostring(ip), ":", tostring(clientport), " write error: ", tostring(err) )
 546                         fatalerror = true
 547                         _ = handler and handler:force_close( err )
 548                         return false
 549                 end
 550         end
 551
 552         -- Set the sslctx
 553         local handshake;
 554         function handler.set_sslctx(self, new_sslctx)
 555                 sslctx = new_sslctx;
 556                 local read, wrote
 557                 handshake = coroutine_wrap( function( client ) -- create handshake coroutine
 558                                 local err
 559                                 for i = 1, _maxsslhandshake do
 560                                         _sendlistlen = ( wrote and removesocket( _sendlist, client, _sendlistlen ) ) or _sendlistlen
 561                                         _readlistlen = ( read and removesocket( _readlist, client, _readlistlen ) ) or _readlistlen
 562                                         read, wrote = nil, nil
 563                                         _, err = client:dohandshake( )
 564                                         if not err then
 565                                                 out_put( "server.lua: ssl handshake done" )
 566                                                 handler.readbuffer = _readbuffer        -- when handshake is done, replace the handshake function with regular functions
 567                                                 handler.sendbuffer = _sendbuffer
 568                                                 _ = status and status( handler, "ssl-handshake-complete" )
 569                                                 if self.autostart_ssl and listeners.onconnect then
 570                                                         listeners.onconnect(self);
 571                                                         if bufferqueuelen ~= 0 then
 572                                                                 _sendlistlen = addsocket(_sendlist, client, _sendlistlen)
 573                                                         end
 574                                                 end
 575                                                 _readlistlen = addsocket(_readlist, client, _readlistlen)
 576                                                 return true
 577                                         else
 578                                                 if err == "wantwrite" then
 579                                                         _sendlistlen = addsocket(_sendlist, client, _sendlistlen)
 580                                                         wrote = true
 581                                                 elseif err == "wantread" then
 582                                                         _readlistlen = addsocket(_readlist, client, _readlistlen)
 583                                                         read = true
 584                                                 else
 585                                                         break;
 586                                                 end
 587                                                 err = nil;
 588                                                 coroutine_yield( ) -- handshake not finished
 589                                         end
 590                                 end
 591                                 out_put( "server.lua: ssl handshake error: ", tostring(err or "handshake too long") )
 592                                 _ = handler and handler:force_close("ssl handshake failed")
 593                                 return false, err -- handshake failed
 594                         end
 595                 )
 596         end
 597         if has_luasec then
 598                 handler.starttls = function( self, _sslctx)
 599                         if _sslctx then
 600                                 handler:set_sslctx(_sslctx);
 601                         end
 602                         if bufferqueuelen > 0 then
 603                                 out_put "server.lua: we need to do tls, but delaying until send buffer empty"
 604                                 needtls = true
 605                                 return
 606                         end
 607                         out_put( "server.lua: attempting to start tls on " .. tostring( socket ) )
 608                         local oldsocket, err = socket
 609                         socket, err = ssl_wrap( socket, sslctx )        -- wrap socket
 610                         if not socket then
 611                                 out_put( "server.lua: error while starting tls on client: ", tostring(err or "unknown error") )
 612                                 return nil, err -- fatal error
 613                         end
 614
 615                         socket:settimeout( 0 )
 616
 617                         -- add the new socket to our system
 618                         send = socket.send
 619                         receive = socket.receive
 620                         shutdown = id
 621                         _socketlist[ socket ] = handler
 622                         _readlistlen = addsocket(_readlist, socket, _readlistlen)
 623
 624                         -- remove traces of the old socket
 625                         _readlistlen = removesocket( _readlist, oldsocket, _readlistlen )
 626                         _sendlistlen = removesocket( _sendlist, oldsocket, _sendlistlen )
 627                         _socketlist[ oldsocket ] = nil
 628
 629                         handler.starttls = nil
 630                         needtls = nil
 631
 632                         -- Secure now (if handshake fails connection will close)
 633                         ssl = true
 634
 635                         handler.readbuffer = handshake
 636                         handler.sendbuffer = handshake
 637                         return handshake( socket ) -- do handshake
 638                 end
 639         end
 640
 641         handler.readbuffer = _readbuffer
 642         handler.sendbuffer = _sendbuffer
 643         send = socket.send
 644         receive = socket.receive
 645         shutdown = ( ssl and id ) or socket.shutdown
 646
 647         _socketlist[ socket ] = handler
 648         _readlistlen = addsocket(_readlist, socket, _readlistlen)
 649
 650         if sslctx and has_luasec then
 651                 out_put "server.lua: auto-starting ssl negotiation..."
 652                 handler.autostart_ssl = true;
 653                 local ok, err = handler:starttls(sslctx);
 654                 if ok == false then
 655                         return nil, nil, err
 656                 end
 657         end
 658
 659         return handler, socket
 660 end
 661
 662 id = function( )
 663 end
 664
 665 idfalse = function( )
 666         return false
 667 end
 668
 669 addsocket = function( list, socket, len )
 670         if not list[ socket ] then
 671                 len = len + 1
 672                 list[ len ] = socket
 673                 list[ socket ] = len
 674         end
 675         return len;
 676 end
 677
 678 removesocket = function( list, socket, len )    -- this function removes sockets from a list ( copied from copas )
 679         local pos = list[ socket ]
 680         if pos then
 681                 list[ socket ] = nil
 682                 local last = list[ len ]
 683                 list[ len ] = nil
 684                 if last ~= socket then
 685                         list[ last ] = pos
 686                         list[ pos ] = last
 687                 end
 688                 return len - 1
 689         end
 690         return len
 691 end
 692
 693 closesocket = function( socket )
 694         _sendlistlen = removesocket( _sendlist, socket, _sendlistlen )
 695         _readlistlen = removesocket( _readlist, socket, _readlistlen )
 696         _socketlist[ socket ] = nil
 697         socket:close( )
 698         --mem_free( )
 699 end
 700
 701 local function link(sender, receiver, buffersize)
 702         local sender_locked;
 703         local _sendbuffer = receiver.sendbuffer;
 704         function receiver.sendbuffer()
 705                 _sendbuffer();
 706                 if sender_locked and receiver.bufferlen() < buffersize then
 707                         sender:lock_read(false); -- Unlock now
 708                         sender_locked = nil;
 709                 end
 710         end
 711
 712         local _readbuffer = sender.readbuffer;
 713         function sender.readbuffer()
 714                 _readbuffer();
 715                 if not sender_locked and receiver.bufferlen() >= buffersize then
 716                         sender_locked = true;
 717                         sender:lock_read(true);
 718                 end
 719         end
 720         sender:set_mode("*a");
 721 end
 722
 723 ----------------------------------// PUBLIC //--
 724
 725 addserver = function( addr, port, listeners, pattern, sslctx ) -- this function provides a way for other scripts to reg a server
 726         local err
 727         if type( listeners ) ~= "table" then
 728                 err = "invalid listener table"
 729         end
 730         if type( port ) ~= "number" or not ( port >= 0 and port <= 65535 ) then
 731                 err = "invalid port"
 732         elseif _server[ addr..":"..port ] then
 733                 err = "listeners on '[" .. addr .. "]:" .. port .. "' already exist"
 734         elseif sslctx and not has_luasec then
 735                 err = "luasec not found"
 736         end
 737         if err then
 738                 out_error( "server.lua, [", addr, "]:", port, ": ", err )
 739                 return nil, err
 740         end
 741         addr = addr or "*"
 742         local server, err = socket_bind( addr, port, _tcpbacklog )
 743         if err then
 744                 out_error( "server.lua, [", addr, "]:", port, ": ", err )
 745                 return nil, err
 746         end
 747         local handler, err = wrapserver( listeners, server, addr, port, pattern, sslctx ) -- wrap new server socket
 748         if not handler then
 749                 server:close( )
 750                 return nil, err
 751         end
 752         server:settimeout( 0 )
 753         _readlistlen = addsocket(_readlist, server, _readlistlen)
 754         _server[ addr..":"..port ] = handler
 755         _socketlist[ server ] = handler
 756         out_put( "server.lua: new "..(sslctx and "ssl " or "").."server listener on '[", addr, "]:", port, "'" )
 757         return handler
 758 end
 759
 760 getserver = function ( addr, port )
 761         return _server[ addr..":"..port ];
 762 end
 763
 764 removeserver = function( addr, port )
 765         local handler = _server[ addr..":"..port ]
 766         if not handler then
 767                 return nil, "no server found on '[" .. addr .. "]:" .. tostring( port ) .. "'"
 768         end
 769         handler:close( )
 770         _server[ addr..":"..port ] = nil
 771         return true
 772 end
 773
 774 closeall = function( )
 775         for _, handler in pairs( _socketlist ) do
 776                 handler:close( )
 777                 _socketlist[ _ ] = nil
 778         end
 779         _readlistlen = 0
 780         _sendlistlen = 0
 781         _timerlistlen = 0
 782         _server = { }
 783         _readlist = { }
 784         _sendlist = { }
 785         _timerlist = { }
 786         _socketlist = { }
 787         --mem_free( )
 788 end
 789
 790 getsettings = function( )
 791         return {
 792                 select_timeout = _selecttimeout;
 793                 select_sleep_time = _sleeptime;
 794                 tcp_backlog = _tcpbacklog;
 795                 max_send_buffer_size = _maxsendlen;
 796                 max_receive_buffer_size = _maxreadlen;
 797                 select_idle_check_interval = _checkinterval;
 798                 send_timeout = _sendtimeout;
 799                 read_timeout = _readtimeout;
 800                 max_connections = _maxselectlen;
 801                 max_ssl_handshake_roundtrips = _maxsslhandshake;
 802                 highest_allowed_fd = _maxfd;
 803         }
 804 end
 805
 806 changesettings = function( new )
 807         if type( new ) ~= "table" then
 808                 return nil, "invalid settings table"
 809         end
 810         _selecttimeout = tonumber( new.select_timeout ) or _selecttimeout
 811         _sleeptime = tonumber( new.select_sleep_time ) or _sleeptime
 812         _maxsendlen = tonumber( new.max_send_buffer_size ) or _maxsendlen
 813         _maxreadlen = tonumber( new.max_receive_buffer_size ) or _maxreadlen
 814         _checkinterval = tonumber( new.select_idle_check_interval ) or _checkinterval
 815         _tcpbacklog = tonumber( new.tcp_backlog ) or _tcpbacklog
 816         _sendtimeout = tonumber( new.send_timeout ) or _sendtimeout
 817         _readtimeout = tonumber( new.read_timeout ) or _readtimeout
 818         _maxselectlen = new.max_connections or _maxselectlen
 819         _maxsslhandshake = new.max_ssl_handshake_roundtrips or _maxsslhandshake
 820         _maxfd = new.highest_allowed_fd or _maxfd
 821         return true
 822 end
 823
 824 addtimer = function( listener )
 825         if type( listener ) ~= "function" then
 826                 return nil, "invalid listener function"
 827         end
 828         _timerlistlen = _timerlistlen + 1
 829         _timerlist[ _timerlistlen ] = listener
 830         return true
 831 end
 832
 833 stats = function( )
 834         return _readtraffic, _sendtraffic, _readlistlen, _sendlistlen, _timerlistlen
 835 end
 836
 837 local quitting;
 838
 839 local function setquitting(quit)
 840         quitting = not not quit;
 841 end
 842
 843 loop = function(once) -- this is the main loop of the program
 844         if quitting then return "quitting"; end
 845         if once then quitting = "once"; end
 846         local next_timer_time = math_huge;
 847         repeat
 848                 local read, write, err = socket_select( _readlist, _sendlist, math_min(_selecttimeout, next_timer_time) )
 849                 for i, socket in ipairs( write ) do -- send data waiting in writequeues
 850                         local handler = _socketlist[ socket ]
 851                         if handler then
 852                                 handler.sendbuffer( )
 853                         else
 854                                 closesocket( socket )
 855                                 out_put "server.lua: found no handler and closed socket (writelist)"    -- this should not happen
 856                         end
 857                 end
 858                 for i, socket in ipairs( read ) do -- receive data
 859                         local handler = _socketlist[ socket ]
 860                         if handler then
 861                                 handler.readbuffer( )
 862                         else
 863                                 closesocket( socket )
 864                                 out_put "server.lua: found no handler and closed socket (readlist)" -- this can happen
 865                         end
 866                 end
 867                 for handler, err in pairs( _closelist ) do
 868                         handler.disconnect( )( handler, err )
 869                         handler:force_close()    -- forced disconnect
 870                         _closelist[ handler ] = nil;
 871                 end
 872                 _currenttime = luasocket_gettime( )
 873
 874                 -- Check for socket timeouts
 875                 local difftime = os_difftime( _currenttime - _starttime )
 876                 if difftime > _checkinterval then
 877                         _starttime = _currenttime
 878                         for handler, timestamp in pairs( _writetimes ) do
 879                                 if os_difftime( _currenttime - timestamp ) > _sendtimeout then
 880                                         handler.disconnect( )( handler, "send timeout" )
 881                                         handler:force_close()    -- forced disconnect
 882                                 end
 883                         end
 884                         for handler, timestamp in pairs( _readtimes ) do
 885                                 if os_difftime( _currenttime - timestamp ) > _readtimeout then
 886                                         if not(handler.onreadtimeout) or handler:onreadtimeout() ~= true then
 887                                                 handler.disconnect( )( handler, "read timeout" )
 888                                                 handler:close( )        -- forced disconnect?
 889                                         else
 890                                                 _readtimes[ handler ] = _currenttime -- reset timer
 891                                         end
 892                                 end
 893                         end
 894                 end
 895
 896                 -- Fire timers
 897                 if _currenttime - _timer >= math_min(next_timer_time, 1) then
 898                         next_timer_time = math_huge;
 899                         for i = 1, _timerlistlen do
 900                                 local t = _timerlist[ i ]( _currenttime ) -- fire timers
 901                                 if t then next_timer_time = math_min(next_timer_time, t); end
 902                         end
 903                         _timer = _currenttime
 904                 else
 905                         next_timer_time = next_timer_time - (_currenttime - _timer);
 906                 end
 907
 908                 -- wait some time (0 by default)
 909                 socket_sleep( _sleeptime )
 910         until quitting;
 911         if once and quitting == "once" then quitting = nil; return; end
 912         return "quitting"
 913 end
 914
 915 local function step()
 916         return loop(true);
 917 end
 918
 919 local function get_backend()
 920         return "select";
 921 end
 922
 923 --// EXPERIMENTAL //--
 924
 925 local wrapclient = function( socket, ip, serverport, listeners, pattern, sslctx )
 926         local handler, socket, err = wrapconnection( nil, listeners, socket, ip, serverport, "clientport", pattern, sslctx )
 927         if not handler then return nil, err end
 928         _socketlist[ socket ] = handler
 929         if not sslctx then
 930                 _sendlistlen = addsocket(_sendlist, socket, _sendlistlen)
 931                 if listeners.onconnect then
 932                         -- When socket is writeable, call onconnect
 933                         local _sendbuffer = handler.sendbuffer;
 934                         handler.sendbuffer = function ()
 935                                 handler.sendbuffer = _sendbuffer;
 936                                 listeners.onconnect(handler);
 937                                 return _sendbuffer(); -- Send any queued outgoing data
 938                         end
 939                 end
 940         end
 941         return handler, socket
 942 end
 943
 944 local addclient = function( address, port, listeners, pattern, sslctx )
 945         local client, err = luasocket.tcp( )
 946         if err then
 947                 return nil, err
 948         end
 949         client:settimeout( 0 )
 950         _, err = client:connect( address, port )
 951         if err then -- try again
 952                 return wrapclient( client, address, port, listeners, pattern, sslctx )
 953         else
 954                 return wrapconnection( nil, listeners, client, address, port, "clientport", pattern, sslctx )
 955         end
 956 end
 957
 958 --// EXPERIMENTAL //--
 959
 960 ----------------------------------// BEGIN //--
 961
 962 use "setmetatable" ( _socketlist, { __mode = "k" } )
 963 use "setmetatable" ( _readtimes, { __mode = "k" } )
 964 use "setmetatable" ( _writetimes, { __mode = "k" } )
 965
 966 _timer = luasocket_gettime( )
 967 _starttime = luasocket_gettime( )
 968
 969 local function setlogger(new_logger)
 970         local old_logger = log;
 971         if new_logger then
 972                 log = new_logger;
 973         end
 974         return old_logger;
 975 end
 976
 977 ----------------------------------// PUBLIC INTERFACE //--
 978
 979 return {
 980         _addtimer = addtimer,
 981
 982         addclient = addclient,
 983         wrapclient = wrapclient,
 984
 985         loop = loop,
 986         link = link,
 987         step = step,
 988         stats = stats,
 989         closeall = closeall,
 990         addserver = addserver,
 991         getserver = getserver,
 992         setlogger = setlogger,
 993         getsettings = getsettings,
 994         setquitting = setquitting,
 995         removeserver = removeserver,
 996         get_backend = get_backend,
 997         changesettings = changesettings,
 998 }