2 -- server.lua by blastbeat of the luadch project
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3 -- Re-used here under the MIT/X Consortium License
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5 -- Modifications (C) 2008-2009 Matthew Wild, Waqas Hussain
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8 -- // wrapping luadch stuff // --
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10 local use = function( what )
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13 local clean = function( tbl )
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14 for i, k in pairs( tbl ) do
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19 local log, table_concat = require ("util.logger").init("socket"), table.concat;
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20 local out_put = function (...) return log("debug", table_concat{...}); end
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21 local out_error = function (...) return log("warn", table_concat{...}); end
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22 local mem_free = collectgarbage
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24 ----------------------------------// DECLARATION //--
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28 local STAT_UNIT = 1 -- byte
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30 --// lua functions //--
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32 local type = use "type"
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33 local pairs = use "pairs"
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34 local ipairs = use "ipairs"
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35 local tostring = use "tostring"
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36 local collectgarbage = use "collectgarbage"
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41 local table = use "table"
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42 local string = use "string"
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43 local coroutine = use "coroutine"
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45 --// lua lib methods //--
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47 local os_time = os.time
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48 local os_difftime = os.difftime
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49 local table_concat = table.concat
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50 local table_remove = table.remove
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51 local string_len = string.len
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52 local string_sub = string.sub
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53 local coroutine_wrap = coroutine.wrap
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54 local coroutine_yield = coroutine.yield
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56 --// extern libs //--
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58 local luasec = select( 2, pcall( require, "ssl" ) )
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59 local luasocket = require "socket"
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61 --// extern lib methods //--
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63 local ssl_wrap = ( luasec and luasec.wrap )
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64 local socket_bind = luasocket.bind
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65 local socket_sleep = luasocket.sleep
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66 local socket_select = luasocket.select
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67 local ssl_newcontext = ( luasec and luasec.newcontext )
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85 local wrapconnection
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86 local changesettings
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99 --// simple data types //--
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104 local _timerlistlen
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109 local _selecttimeout
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118 local _checkinterval
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126 local _maxclientsperserver
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128 ----------------------------------// DEFINITION //--
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130 _server = { } -- key = port, value = table; list of listening servers
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131 _readlist = { } -- array with sockets to read from
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132 _sendlist = { } -- arrary with sockets to write to
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133 _timerlist = { } -- array of timer functions
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134 _socketlist = { } -- key = socket, value = wrapped socket (handlers)
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135 _readtimes = { } -- key = handler, value = timestamp of last data reading
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136 _writetimes = { } -- key = handler, value = timestamp of last data writing/sending
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137 _closelist = { } -- handlers to close
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139 _readlistlen = 0 -- length of readlist
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140 _sendlistlen = 0 -- length of sendlist
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141 _timerlistlen = 0 -- lenght of timerlist
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143 _sendtraffic = 0 -- some stats
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146 _selecttimeout = 1 -- timeout of socket.select
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147 _sleeptime = 0 -- time to wait at the end of every loop
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149 _maxsendlen = 51000 * 1024 -- max len of send buffer
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150 _maxreadlen = 25000 * 1024 -- max len of read buffer
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152 _checkinterval = 1200000 -- interval in secs to check idle clients
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153 _sendtimeout = 60000 -- allowed send idle time in secs
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154 _readtimeout = 6 * 60 * 60 -- allowed read idle time in secs
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156 _cleanqueue = false -- clean bufferqueue after using
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158 _maxclientsperserver = 1000
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160 ----------------------------------// PRIVATE //--
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162 wrapserver = function( listeners, socket, ip, serverport, pattern, sslctx, maxconnections, startssl ) -- this function wraps a server
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164 maxconnections = maxconnections or _maxclientsperserver
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166 local connections = 0
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168 local dispatch, disconnect = listeners.incoming or listeners.listener, listeners.disconnect
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176 if not ssl_newcontext then
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177 out_error "luasec not found"
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180 if type( sslctx ) ~= "table" then
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181 out_error "server.lua: wrong server sslctx"
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184 sslctx, err = ssl_newcontext( sslctx )
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186 err = err or "wrong sslctx parameters"
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187 out_error( "server.lua: ", err )
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194 out_error( "server.lua: Cannot start ssl on port: ", serverport )
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195 return nil, "Cannot start ssl, see log for details"
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197 out_put("server.lua: ", "ssl not enabled on ", serverport);
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201 local accept = socket.accept
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203 --// public methods of the object //--
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205 local handler = { }
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207 handler.shutdown = function( ) end
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209 handler.ssl = function( )
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212 handler.remove = function( )
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213 connections = connections - 1
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215 handler.close = function( )
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216 for _, handler in pairs( _socketlist ) do
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217 if handler.serverport == serverport then
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218 handler.disconnect( handler, "server closed" )
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219 handler.close( true )
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223 _sendlistlen = removesocket( _sendlist, socket, _sendlistlen )
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224 _readlistlen = removesocket( _readlist, socket, _readlistlen )
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225 _socketlist[ socket ] = nil
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229 out_put "server.lua: closed server handler and removed sockets from list"
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231 handler.ip = function( )
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234 handler.serverport = function( )
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237 handler.socket = function( )
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240 handler.readbuffer = function( )
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241 if connections > maxconnections then
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242 out_put( "server.lua: refused new client connection: server full" )
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245 local client, err = accept( socket ) -- try to accept
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247 local ip, clientport = client:getpeername( )
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248 client:settimeout( 0 )
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249 local handler, client, err = wrapconnection( handler, listeners, client, ip, serverport, clientport, pattern, sslctx, startssl ) -- wrap new client socket
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250 if err then -- error while wrapping ssl socket
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253 connections = connections + 1
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254 out_put( "server.lua: accepted new client connection from ", tostring(ip), ":", tostring(clientport), " to ", tostring(serverport))
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255 return dispatch( handler )
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256 elseif err then -- maybe timeout or something else
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257 out_put( "server.lua: error with new client connection: ", tostring(err) )
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264 wrapconnection = function( server, listeners, socket, ip, serverport, clientport, pattern, sslctx, startssl ) -- this function wraps a client to a handler object
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266 socket:settimeout( 0 )
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268 --// local import of socket methods //--
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274 --// private closures of the object //--
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278 local dispatch = listeners.incoming or listeners.listener
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279 local disconnect = listeners.disconnect
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281 local bufferqueue = { } -- buffer array
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282 local bufferqueuelen = 0 -- end of buffer array
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288 local bufferlen = 0
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290 local noread = false
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291 local nosend = false
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293 local sendtraffic, readtraffic = 0, 0
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295 local maxsendlen = _maxsendlen
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296 local maxreadlen = _maxreadlen
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298 --// public methods of the object //--
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300 local handler = bufferqueue -- saves a table ^_^
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302 handler.dispatch = function( )
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305 handler.disconnect = function( )
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308 handler.setlistener = function( listeners )
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309 dispatch = listeners.incoming
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310 disconnect = listeners.disconnect
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312 handler.getstats = function( )
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313 return readtraffic, sendtraffic
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315 handler.ssl = function( )
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318 handler.send = function( _, data, i, j )
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319 return send( socket, data, i, j )
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321 handler.receive = function( pattern, prefix )
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322 return receive( socket, pattern, prefix )
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324 handler.shutdown = function( pattern )
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325 return shutdown( socket, pattern )
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327 handler.close = function( forced )
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328 if not handler then return true; end
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329 _readlistlen = removesocket( _readlist, socket, _readlistlen )
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330 _readtimes[ handler ] = nil
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331 if bufferqueuelen ~= 0 then
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332 if not ( forced or fatalerror ) then
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333 handler.sendbuffer( )
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334 if bufferqueuelen ~= 0 then -- try again...
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336 handler.write = nil -- ... but no further writing allowed
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342 send( socket, table_concat( bufferqueue, "", 1, bufferqueuelen ), 1, bufferlen ) -- forced send
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345 _ = shutdown and shutdown( socket )
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347 _sendlistlen = removesocket( _sendlist, socket, _sendlistlen )
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348 _socketlist[ socket ] = nil
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350 _writetimes[ handler ] = nil
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351 _closelist[ handler ] = nil
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359 out_put "server.lua: closed client handler and removed socket from list"
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362 handler.ip = function( )
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365 handler.serverport = function( )
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368 handler.clientport = function( )
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371 local write = function( data )
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372 bufferlen = bufferlen + string_len( data )
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373 if bufferlen > maxsendlen then
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374 _closelist[ handler ] = "send buffer exceeded" -- cannot close the client at the moment, have to wait to the end of the cycle
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375 handler.write = idfalse -- dont write anymore
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377 elseif socket and not _sendlist[ socket ] then
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378 _sendlistlen = _sendlistlen + 1
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379 _sendlist[ _sendlistlen ] = socket
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380 _sendlist[ socket ] = _sendlistlen
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382 bufferqueuelen = bufferqueuelen + 1
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383 bufferqueue[ bufferqueuelen ] = data
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385 _writetimes[ handler ] = _writetimes[ handler ] or _currenttime
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389 handler.write = write
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390 handler.bufferqueue = function( )
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393 handler.socket = function( )
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396 handler.pattern = function( new )
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397 pattern = new or pattern
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400 handler.setsend = function ( newsend )
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401 send = newsend or send
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404 handler.bufferlen = function( readlen, sendlen )
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405 maxsendlen = sendlen or maxsendlen
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406 maxreadlen = readlen or maxreadlen
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407 return maxreadlen, maxsendlen
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409 handler.lock = function( switch )
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410 if switch == true then
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411 handler.write = idfalse
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412 local tmp = _sendlistlen
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413 _sendlistlen = removesocket( _sendlist, socket, _sendlistlen )
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414 _writetimes[ handler ] = nil
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415 if _sendlistlen ~= tmp then
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419 _readlistlen = removesocket( _readlist, socket, _readlistlen )
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420 _readtimes[ handler ] = nil
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421 if _readlistlen ~= tmp then
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424 elseif switch == false then
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425 handler.write = write
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428 _readlistlen = _readlistlen + 1
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429 _readlist[ socket ] = _readlistlen
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430 _readlist[ _readlistlen ] = socket
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431 _readtimes[ handler ] = _currenttime
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438 return noread, nosend
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440 local _readbuffer = function( ) -- this function reads data
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441 local buffer, err, part = receive( socket, pattern ) -- receive buffer with "pattern"
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442 if not err or ( err == "timeout" or err == "wantread" ) then -- received something
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443 local buffer = buffer or part or ""
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444 local len = string_len( buffer )
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445 if len > maxreadlen then
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446 disconnect( handler, "receive buffer exceeded" )
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447 handler.close( true )
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450 local count = len * STAT_UNIT
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451 readtraffic = readtraffic + count
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452 _readtraffic = _readtraffic + count
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453 _readtimes[ handler ] = _currenttime
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454 --out_put( "server.lua: read data '", buffer, "', error: ", err )
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455 return dispatch( handler, buffer, err )
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456 else -- connections was closed or fatal error
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457 out_put( "server.lua: client ", tostring(ip), ":", tostring(clientport), " error: ", tostring(err) )
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459 disconnect( handler, err )
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460 _ = handler and handler.close( )
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464 local _sendbuffer = function( ) -- this function sends data
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465 local buffer = table_concat( bufferqueue, "", 1, bufferqueuelen )
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466 local succ, err, byte = send( socket, buffer, 1, bufferlen )
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467 local count = ( succ or byte or 0 ) * STAT_UNIT
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468 sendtraffic = sendtraffic + count
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469 _sendtraffic = _sendtraffic + count
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470 _ = _cleanqueue and clean( bufferqueue )
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471 --out_put( "server.lua: sended '", buffer, "', bytes: ", tostring(succ), ", error: ", tostring(err), ", part: ", tostring(byte), ", to: ", tostring(ip), ":", tostring(clientport) )
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472 if succ then -- sending succesful
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475 _sendlistlen = removesocket( _sendlist, socket, _sendlistlen ) -- delete socket from writelist
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476 _ = needtls and handler.starttls(true)
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477 _writetimes[ handler ] = nil
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478 _ = toclose and handler.close( )
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480 elseif byte and ( err == "timeout" or err == "wantwrite" ) then -- want write
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481 buffer = string_sub( buffer, byte + 1, bufferlen ) -- new buffer
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482 bufferqueue[ 1 ] = buffer -- insert new buffer in queue
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484 bufferlen = bufferlen - byte
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485 _writetimes[ handler ] = _currenttime
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487 else -- connection was closed during sending or fatal error
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488 out_put( "server.lua: client ", tostring(ip), ":", tostring(clientport), " error: ", tostring(err) )
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490 disconnect( handler, err )
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491 _ = handler and handler.close( )
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496 if sslctx then -- ssl?
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500 local handshake = coroutine_wrap( function( client ) -- create handshake coroutine
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502 for i = 1, 10 do -- 10 handshake attemps
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503 _sendlistlen = ( wrote and removesocket( _sendlist, socket, _sendlistlen ) ) or _sendlistlen
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504 _readlistlen = ( read and removesocket( _readlist, socket, _readlistlen ) ) or _readlistlen
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505 read, wrote = nil, nil
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506 _, err = client:dohandshake( )
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508 out_put( "server.lua: ssl handshake done" )
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509 handler.readbuffer = _readbuffer -- when handshake is done, replace the handshake function with regular functions
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510 handler.sendbuffer = _sendbuffer
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511 -- return dispatch( handler )
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514 out_put( "server.lua: error during ssl handshake: ", tostring(err) )
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515 if err == "wantwrite" and not wrote then
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516 _sendlistlen = _sendlistlen + 1
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517 _sendlist[ _sendlistlen ] = client
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519 elseif err == "wantread" and not read then
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520 _readlistlen = _readlistlen + 1
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521 _readlist [ _readlistlen ] = client
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526 --coroutine_yield( handler, nil, err ) -- handshake not finished
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530 disconnect( handler, "ssl handshake failed" )
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531 _ = handler and handler.close( true ) -- forced disconnect
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532 return false -- handshake failed
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535 if startssl then -- ssl now?
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536 --out_put("server.lua: ", "starting ssl handshake")
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538 socket, err = ssl_wrap( socket, sslctx ) -- wrap socket
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540 out_put( "server.lua: ssl error: ", tostring(err) )
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542 return nil, nil, err -- fatal error
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544 socket:settimeout( 0 )
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545 handler.readbuffer = handshake
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546 handler.sendbuffer = handshake
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547 handshake( socket ) -- do handshake
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549 return nil, nil, "ssl handshake failed";
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552 -- We're not automatically doing SSL, so we're not secure (yet)
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554 handler.starttls = function( now )
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556 --out_put "server.lua: we need to do tls, but delaying until later"
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560 --out_put( "server.lua: attempting to start tls on " .. tostring( socket ) )
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561 local oldsocket, err = socket
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562 socket, err = ssl_wrap( socket, sslctx ) -- wrap socket
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563 --out_put( "server.lua: sslwrapped socket is " .. tostring( socket ) )
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565 out_put( "server.lua: error while starting tls on client: ", tostring(err) )
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566 return nil, err -- fatal error
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569 socket:settimeout( 0 )
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571 -- add the new socket to our system
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574 receive = socket.receive
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577 _socketlist[ socket ] = handler
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578 _readlistlen = _readlistlen + 1
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579 _readlist[ _readlistlen ] = socket
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580 _readlist[ socket ] = _readlistlen
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582 -- remove traces of the old socket
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584 _readlistlen = removesocket( _readlist, oldsocket, _readlistlen )
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585 _sendlistlen = removesocket( _sendlist, oldsocket, _sendlistlen )
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586 _socketlist[ oldsocket ] = nil
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588 handler.starttls = nil
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594 handler.readbuffer = handshake
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595 handler.sendbuffer = handshake
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596 handshake( socket ) -- do handshake
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598 handler.readbuffer = _readbuffer
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599 handler.sendbuffer = _sendbuffer
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601 else -- normal connection
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603 handler.readbuffer = _readbuffer
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604 handler.sendbuffer = _sendbuffer
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608 receive = socket.receive
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609 shutdown = ( ssl and id ) or socket.shutdown
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611 _socketlist[ socket ] = handler
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612 _readlistlen = _readlistlen + 1
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613 _readlist[ _readlistlen ] = socket
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614 _readlist[ socket ] = _readlistlen
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616 return handler, socket
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622 idfalse = function( )
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626 removesocket = function( list, socket, len ) -- this function removes sockets from a list ( copied from copas )
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627 local pos = list[ socket ]
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629 list[ socket ] = nil
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630 local last = list[ len ]
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632 if last ~= socket then
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641 closesocket = function( socket )
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642 _sendlistlen = removesocket( _sendlist, socket, _sendlistlen )
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643 _readlistlen = removesocket( _readlist, socket, _readlistlen )
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644 _socketlist[ socket ] = nil
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649 ----------------------------------// PUBLIC //--
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651 addserver = function( listeners, port, addr, pattern, sslctx, maxconnections, startssl ) -- this function provides a way for other scripts to reg a server
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653 --out_put("server.lua: autossl on ", port, " is ", startssl)
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654 if type( listeners ) ~= "table" then
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655 err = "invalid listener table"
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657 if not type( port ) == "number" or not ( port >= 0 and port <= 65535 ) then
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658 err = "invalid port"
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659 elseif _server[ port ] then
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660 err = "listeners on port '" .. port .. "' already exist"
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661 elseif sslctx and not luasec then
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662 err = "luasec not found"
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665 out_error( "server.lua, port ", port, ": ", err )
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669 local server, err = socket_bind( addr, port )
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671 out_error( "server.lua, port ", port, ": ", err )
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674 local handler, err = wrapserver( listeners, server, addr, port, pattern, sslctx, maxconnections, startssl ) -- wrap new server socket
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675 if not handler then
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679 server:settimeout( 0 )
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680 _readlistlen = _readlistlen + 1
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681 _readlist[ _readlistlen ] = server
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682 _server[ port ] = handler
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683 _socketlist[ server ] = handler
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684 out_put( "server.lua: new server listener on '", addr, ":", port, "'" )
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688 getserver = function ( port )
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689 return _server[ port ];
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692 removeserver = function( port )
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693 local handler = _server[ port ]
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694 if not handler then
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695 return nil, "no server found on port '" .. tostring( port ) "'"
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698 _server[ port ] = nil
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702 closeall = function( )
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703 for _, handler in pairs( _socketlist ) do
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705 _socketlist[ _ ] = nil
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718 getsettings = function( )
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719 return _selecttimeout, _sleeptime, _maxsendlen, _maxreadlen, _checkinterval, _sendtimeout, _readtimeout, _cleanqueue, _maxclientsperserver
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722 changesettings = function( new )
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723 if type( new ) ~= "table" then
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724 return nil, "invalid settings table"
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726 _selecttimeout = tonumber( new.timeout ) or _selecttimeout
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727 _sleeptime = tonumber( new.sleeptime ) or _sleeptime
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728 _maxsendlen = tonumber( new.maxsendlen ) or _maxsendlen
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729 _maxreadlen = tonumber( new.maxreadlen ) or _maxreadlen
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730 _checkinterval = tonumber( new.checkinterval ) or _checkinterval
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731 _sendtimeout = tonumber( new.sendtimeout ) or _sendtimeout
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732 _readtimeout = tonumber( new.readtimeout ) or _readtimeout
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733 _cleanqueue = new.cleanqueue
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734 _maxclientsperserver = new._maxclientsperserver or _maxclientsperserver
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738 addtimer = function( listener )
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739 if type( listener ) ~= "function" then
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740 return nil, "invalid listener function"
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742 _timerlistlen = _timerlistlen + 1
\r
743 _timerlist[ _timerlistlen ] = listener
\r
747 stats = function( )
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748 return _readtraffic, _sendtraffic, _readlistlen, _sendlistlen, _timerlistlen
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751 local dontstop = true; -- thinking about tomorrow, ...
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753 setquitting = function (quit)
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754 dontstop = not quit;
\r
758 loop = function( ) -- this is the main loop of the program
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760 local read, write, err = socket_select( _readlist, _sendlist, _selecttimeout )
\r
761 for i, socket in ipairs( write ) do -- send data waiting in writequeues
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762 local handler = _socketlist[ socket ]
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764 handler.sendbuffer( )
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766 closesocket( socket )
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767 out_put "server.lua: found no handler and closed socket (writelist)" -- this should not happen
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770 for i, socket in ipairs( read ) do -- receive data
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771 local handler = _socketlist[ socket ]
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773 handler.readbuffer( )
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775 closesocket( socket )
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776 out_put "server.lua: found no handler and closed socket (readlist)" -- this can happen
\r
779 for handler, err in pairs( _closelist ) do
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780 handler.disconnect( )( handler, err )
\r
781 handler.close( true ) -- forced disconnect
\r
783 clean( _closelist )
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784 _currenttime = os_time( )
\r
785 if os_difftime( _currenttime - _timer ) >= 1 then
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786 for i = 1, _timerlistlen do
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787 _timerlist[ i ]( ) -- fire timers
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789 _timer = _currenttime
\r
791 socket_sleep( _sleeptime ) -- wait some time
\r
792 --collectgarbage( )
\r
797 --// EXPERIMENTAL //--
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799 local wrapclient = function( socket, ip, serverport, listeners, pattern, sslctx, startssl )
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800 local handler = wrapconnection( nil, listeners, socket, ip, serverport, "clientport", pattern, sslctx, startssl )
\r
801 _socketlist[ socket ] = handler
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802 _sendlistlen = _sendlistlen + 1
\r
803 _sendlist[ _sendlistlen ] = socket
\r
804 _sendlist[ socket ] = _sendlistlen
\r
805 return handler, socket
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808 local addclient = function( address, port, listeners, pattern, sslctx, startssl )
\r
809 local client, err = luasocket.tcp( )
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813 client:settimeout( 0 )
\r
814 _, err = client:connect( address, port )
\r
815 if err then -- try again
\r
816 local handler = wrapclient( client, address, port, listeners )
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818 wrapconnection( nil, listeners, client, address, port, "clientport", pattern, sslctx, startssl )
\r
822 --// EXPERIMENTAL //--
\r
824 ----------------------------------// BEGIN //--
\r
826 use "setmetatable" ( _socketlist, { __mode = "k" } )
\r
827 use "setmetatable" ( _readtimes, { __mode = "k" } )
\r
828 use "setmetatable" ( _writetimes, { __mode = "k" } )
\r
830 _timer = os_time( )
\r
831 _starttime = os_time( )
\r
833 addtimer( function( )
\r
834 local difftime = os_difftime( _currenttime - _starttime )
\r
835 if difftime > _checkinterval then
\r
836 _starttime = _currenttime
\r
837 for handler, timestamp in pairs( _writetimes ) do
\r
838 if os_difftime( _currenttime - timestamp ) > _sendtimeout then
\r
839 --_writetimes[ handler ] = nil
\r
840 handler.disconnect( )( handler, "send timeout" )
\r
841 handler.close( true ) -- forced disconnect
\r
844 for handler, timestamp in pairs( _readtimes ) do
\r
845 if os_difftime( _currenttime - timestamp ) > _readtimeout then
\r
846 --_readtimes[ handler ] = nil
\r
847 handler.disconnect( )( handler, "read timeout" )
\r
848 handler.close( ) -- forced disconnect?
\r
855 ----------------------------------// PUBLIC INTERFACE //--
\r
859 addclient = addclient,
\r
860 wrapclient = wrapclient,
\r
864 closeall = closeall,
\r
865 addtimer = addtimer,
\r
866 addserver = addserver,
\r
867 getserver = getserver,
\r
868 getsettings = getsettings,
\r
869 setquitting = setquitting,
\r
870 removeserver = removeserver,
\r
871 changesettings = changesettings,
\r