net/server_event.lua

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