3 server.lua by blastbeat
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5 - this script contains the server loop of the program
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6 - other scripts can reg a server here
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10 -- // wrapping luadch stuff // --
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12 local use = function( what )
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15 local clean = function( tbl )
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16 for i, k in pairs( tbl ) do
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21 local log, table_concat = require ("util.logger").init("socket"), table.concat;
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22 local out_put = function (...) return log("debug", table_concat{...}); end
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23 local out_error = function (...) return log("warn", table_concat{...}); end
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24 local mem_free = collectgarbage
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26 ----------------------------------// DECLARATION //--
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30 local STAT_UNIT = 1 -- byte
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32 --// lua functions //--
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34 local type = use "type"
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35 local pairs = use "pairs"
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36 local ipairs = use "ipairs"
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37 local tostring = use "tostring"
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38 local collectgarbage = use "collectgarbage"
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43 local table = use "table"
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44 local string = use "string"
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45 local coroutine = use "coroutine"
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47 --// lua lib methods //--
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49 local os_time = os.time
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50 local os_difftime = os.difftime
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51 local table_concat = table.concat
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52 local table_remove = table.remove
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53 local string_len = string.len
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54 local string_sub = string.sub
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55 local coroutine_wrap = coroutine.wrap
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56 local coroutine_yield = coroutine.yield
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58 --// extern libs //--
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60 local luasec = select( 2, pcall( require, "ssl" ) )
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61 local luasocket = require "socket"
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63 --// extern lib methods //--
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65 local ssl_wrap = ( luasec and luasec.wrap )
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66 local socket_bind = luasocket.bind
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67 local socket_sleep = luasocket.sleep
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68 local socket_select = luasocket.select
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69 local ssl_newcontext = ( luasec and luasec.newcontext )
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87 local wrapconnection
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88 local changesettings
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101 --// simple data types //--
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106 local _timerlistlen
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111 local _selecttimeout
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120 local _checkinterval
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128 local _maxclientsperserver
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130 ----------------------------------// DEFINITION //--
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132 _server = { } -- key = port, value = table; list of listening servers
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133 _readlist = { } -- array with sockets to read from
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134 _sendlist = { } -- arrary with sockets to write to
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135 _timerlist = { } -- array of timer functions
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136 _socketlist = { } -- key = socket, value = wrapped socket (handlers)
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137 _readtimes = { } -- key = handler, value = timestamp of last data reading
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138 _writetimes = { } -- key = handler, value = timestamp of last data writing/sending
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139 _closelist = { } -- handlers to close
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141 _readlistlen = 0 -- length of readlist
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142 _sendlistlen = 0 -- length of sendlist
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143 _timerlistlen = 0 -- lenght of timerlist
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145 _sendtraffic = 0 -- some stats
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148 _selecttimeout = 1 -- timeout of socket.select
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149 _sleeptime = 0 -- time to wait at the end of every loop
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151 _maxsendlen = 51000 * 1024 -- max len of send buffer
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152 _maxreadlen = 25000 * 1024 -- max len of read buffer
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154 _checkinterval = 1200000 -- interval in secs to check idle clients
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155 _sendtimeout = 60000 -- allowed send idle time in secs
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156 _readtimeout = 6 * 60 * 60 -- allowed read idle time in secs
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158 _cleanqueue = false -- clean bufferqueue after using
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160 _maxclientsperserver = 1000
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162 ----------------------------------// PRIVATE //--
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164 wrapserver = function( listeners, socket, ip, serverport, pattern, sslctx, maxconnections, startssl ) -- this function wraps a server
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166 maxconnections = maxconnections or _maxclientsperserver
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168 local connections = 0
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170 local dispatch, disconnect = listeners.incoming or listeners.listener, listeners.disconnect
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177 if not ssl_newcontext then
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178 return nil, "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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182 return nil, "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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192 out_put("server.lua: ", "ssl not enabled on ", serverport);
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195 local accept = socket.accept
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197 --// public methods of the object //--
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199 local handler = { }
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201 handler.shutdown = function( ) end
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203 handler.ssl = function( )
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206 handler.remove = function( )
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207 connections = connections - 1
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209 handler.close = function( )
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210 for _, handler in pairs( _socketlist ) do
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211 if handler.serverport == serverport then
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212 handler.disconnect( handler, "server closed" )
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213 handler.close( true )
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217 _sendlistlen = removesocket( _sendlist, socket, _sendlistlen )
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218 _readlistlen = removesocket( _readlist, socket, _readlistlen )
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219 _socketlist[ socket ] = nil
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223 out_put "server.lua: closed server handler and removed sockets from list"
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225 handler.ip = function( )
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228 handler.serverport = function( )
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231 handler.socket = function( )
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234 handler.readbuffer = function( )
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235 if connections > maxconnections then
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236 out_put( "server.lua: refused new client connection: server full" )
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239 local client, err = accept( socket ) -- try to accept
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241 local ip, clientport = client:getpeername( )
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242 client:settimeout( 0 )
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243 local handler, client, err = wrapconnection( handler, listeners, client, ip, serverport, clientport, pattern, sslctx, startssl ) -- wrap new client socket
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244 if err then -- error while wrapping ssl socket
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247 connections = connections + 1
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248 out_put( "server.lua: accepted new client connection from ", tostring(ip), ":", tostring(clientport), " to ", tostring(serverport))
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249 return dispatch( handler )
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250 elseif err then -- maybe timeout or something else
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251 out_put( "server.lua: error with new client connection: ", tostring(err) )
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258 wrapconnection = function( server, listeners, socket, ip, serverport, clientport, pattern, sslctx, startssl ) -- this function wraps a client to a handler object
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260 socket:settimeout( 0 )
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262 --// local import of socket methods //--
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268 --// private closures of the object //--
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272 local dispatch = listeners.incoming or listeners.listener
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273 local disconnect = listeners.disconnect
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275 local bufferqueue = { } -- buffer array
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276 local bufferqueuelen = 0 -- end of buffer array
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282 local bufferlen = 0
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284 local noread = false
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285 local nosend = false
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287 local sendtraffic, readtraffic = 0, 0
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289 local maxsendlen = _maxsendlen
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290 local maxreadlen = _maxreadlen
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292 --// public methods of the object //--
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294 local handler = bufferqueue -- saves a table ^_^
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296 handler.dispatch = function( )
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299 handler.disconnect = function( )
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302 handler.setlistener = function( listeners )
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303 dispatch = listeners.incoming
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304 disconnect = listeners.disconnect
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306 handler.getstats = function( )
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307 return readtraffic, sendtraffic
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309 handler.ssl = function( )
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312 handler.send = function( _, data, i, j )
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313 return send( socket, data, i, j )
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315 handler.receive = function( pattern, prefix )
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316 return receive( socket, pattern, prefix )
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318 handler.shutdown = function( pattern )
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319 return shutdown( socket, pattern )
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321 handler.close = function( forced )
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322 if not handler then return true; end
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323 _readlistlen = removesocket( _readlist, socket, _readlistlen )
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324 _readtimes[ handler ] = nil
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325 if bufferqueuelen ~= 0 then
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326 if not ( forced or fatalerror ) then
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327 handler.sendbuffer( )
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328 if bufferqueuelen ~= 0 then -- try again...
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330 handler.write = nil -- ... but no further writing allowed
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336 send( socket, table_concat( bufferqueue, "", 1, bufferqueuelen ), 1, bufferlen ) -- forced send
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339 _ = shutdown and shutdown( socket )
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341 _sendlistlen = removesocket( _sendlist, socket, _sendlistlen )
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342 _socketlist[ socket ] = nil
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344 _writetimes[ handler ] = nil
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345 _closelist[ handler ] = nil
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353 out_put "server.lua: closed client handler and removed socket from list"
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356 handler.ip = function( )
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359 handler.serverport = function( )
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362 handler.clientport = function( )
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365 local write = function( data )
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366 bufferlen = bufferlen + string_len( data )
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367 if bufferlen > maxsendlen then
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368 _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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369 handler.write = idfalse -- dont write anymore
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371 elseif socket and not _sendlist[ socket ] then
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372 _sendlistlen = _sendlistlen + 1
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373 _sendlist[ _sendlistlen ] = socket
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374 _sendlist[ socket ] = _sendlistlen
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376 bufferqueuelen = bufferqueuelen + 1
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377 bufferqueue[ bufferqueuelen ] = data
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379 _writetimes[ handler ] = _writetimes[ handler ] or _currenttime
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383 handler.write = write
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384 handler.bufferqueue = function( )
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387 handler.socket = function( )
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390 handler.pattern = function( new )
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391 pattern = new or pattern
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394 handler.setsend = function ( newsend )
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395 send = newsend or send
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398 handler.bufferlen = function( readlen, sendlen )
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399 maxsendlen = sendlen or maxsendlen
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400 maxreadlen = readlen or maxreadlen
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401 return maxreadlen, maxsendlen
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403 handler.lock = function( switch )
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404 if switch == true then
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405 handler.write = idfalse
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406 local tmp = _sendlistlen
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407 _sendlistlen = removesocket( _sendlist, socket, _sendlistlen )
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408 _writetimes[ handler ] = nil
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409 if _sendlistlen ~= tmp then
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413 _readlistlen = removesocket( _readlist, socket, _readlistlen )
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414 _readtimes[ handler ] = nil
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415 if _readlistlen ~= tmp then
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418 elseif switch == false then
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419 handler.write = write
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422 _readlistlen = _readlistlen + 1
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423 _readlist[ socket ] = _readlistlen
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424 _readlist[ _readlistlen ] = socket
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425 _readtimes[ handler ] = _currenttime
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432 return noread, nosend
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434 local _readbuffer = function( ) -- this function reads data
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435 local buffer, err, part = receive( socket, pattern ) -- receive buffer with "pattern"
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436 if not err or ( err == "timeout" or err == "wantread" ) then -- received something
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437 local buffer = buffer or part or ""
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438 local len = string_len( buffer )
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439 if len > maxreadlen then
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440 disconnect( handler, "receive buffer exceeded" )
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441 handler.close( true )
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444 local count = len * STAT_UNIT
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445 readtraffic = readtraffic + count
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446 _readtraffic = _readtraffic + count
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447 _readtimes[ handler ] = _currenttime
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448 --out_put( "server.lua: read data '", buffer, "', error: ", err )
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449 return dispatch( handler, buffer, err )
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450 else -- connections was closed or fatal error
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451 out_put( "server.lua: client ", tostring(ip), ":", tostring(clientport), " error: ", tostring(err) )
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453 disconnect( handler, err )
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454 _ = handler and handler.close( )
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458 local _sendbuffer = function( ) -- this function sends data
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459 local buffer = table_concat( bufferqueue, "", 1, bufferqueuelen )
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460 local succ, err, byte = send( socket, buffer, 1, bufferlen )
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461 local count = ( succ or byte or 0 ) * STAT_UNIT
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462 sendtraffic = sendtraffic + count
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463 _sendtraffic = _sendtraffic + count
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464 _ = _cleanqueue and clean( bufferqueue )
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465 --out_put( "server.lua: sended '", buffer, "', bytes: ", tostring(succ), ", error: ", tostring(err), ", part: ", tostring(byte), ", to: ", tostring(ip), ":", tostring(clientport) )
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466 if succ then -- sending succesful
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469 _sendlistlen = removesocket( _sendlist, socket, _sendlistlen ) -- delete socket from writelist
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470 _ = needtls and handler.starttls(true)
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471 _writetimes[ handler ] = nil
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472 _ = toclose and handler.close( )
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474 elseif byte and ( err == "timeout" or err == "wantwrite" ) then -- want write
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475 buffer = string_sub( buffer, byte + 1, bufferlen ) -- new buffer
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476 bufferqueue[ 1 ] = buffer -- insert new buffer in queue
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478 bufferlen = bufferlen - byte
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479 _writetimes[ handler ] = _currenttime
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481 else -- connection was closed during sending or fatal error
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482 out_put( "server.lua: client ", tostring(ip), ":", tostring(clientport), " error: ", tostring(err) )
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484 disconnect( handler, err )
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485 _ = handler and handler.close( )
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490 if sslctx then -- ssl?
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494 local handshake = coroutine_wrap( function( client ) -- create handshake coroutine
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496 for i = 1, 10 do -- 10 handshake attemps
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497 _sendlistlen = ( wrote and removesocket( _sendlist, socket, _sendlistlen ) ) or _sendlistlen
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498 _readlistlen = ( read and removesocket( _readlist, socket, _readlistlen ) ) or _readlistlen
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499 read, wrote = nil, nil
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500 _, err = client:dohandshake( )
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502 out_put( "server.lua: ssl handshake done" )
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503 handler.readbuffer = _readbuffer -- when handshake is done, replace the handshake function with regular functions
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504 handler.sendbuffer = _sendbuffer
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505 -- return dispatch( handler )
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508 out_put( "server.lua: error during ssl handshake: ", tostring(err) )
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509 if err == "wantwrite" and not wrote then
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510 _sendlistlen = _sendlistlen + 1
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511 _sendlist[ _sendlistlen ] = client
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513 elseif err == "wantread" and not read then
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514 _readlistlen = _readlistlen + 1
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515 _readlist [ _readlistlen ] = client
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520 --coroutine_yield( handler, nil, err ) -- handshake not finished
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524 disconnect( handler, "ssl handshake failed" )
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525 handler.close( true ) -- forced disconnect
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526 return false -- handshake failed
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529 if startssl then -- ssl now?
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530 --out_put("server.lua: ", "starting ssl handshake")
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532 socket, err = ssl_wrap( socket, sslctx ) -- wrap socket
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534 out_put( "server.lua: ssl error: ", tostring(err) )
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536 return nil, nil, err -- fatal error
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538 socket:settimeout( 0 )
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539 handler.readbuffer = handshake
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540 handler.sendbuffer = handshake
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541 handshake( socket ) -- do handshake
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543 handler.starttls = function( now )
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545 --out_put "server.lua: we need to do tls, but delaying until later"
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549 --out_put( "server.lua: attempting to start tls on " .. tostring( socket ) )
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550 local oldsocket, err = socket
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551 socket, err = ssl_wrap( socket, sslctx ) -- wrap socket
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552 --out_put( "server.lua: sslwrapped socket is " .. tostring( socket ) )
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554 out_put( "server.lua: error while starting tls on client: ", tostring(err) )
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555 return nil, err -- fatal error
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558 socket:settimeout( 0 )
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560 -- add the new socket to our system
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563 receive = socket.receive
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566 _socketlist[ socket ] = handler
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567 _readlistlen = _readlistlen + 1
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568 _readlist[ _readlistlen ] = socket
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569 _readlist[ socket ] = _readlistlen
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571 -- remove traces of the old socket
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573 _readlistlen = removesocket( _readlist, oldsocket, _readlistlen )
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574 _sendlistlen = removesocket( _sendlist, oldsocket, _sendlistlen )
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575 _socketlist[ oldsocket ] = nil
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577 handler.starttls = nil
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580 handler.readbuffer = handshake
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581 handler.sendbuffer = handshake
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582 handshake( socket ) -- do handshake
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584 handler.readbuffer = _readbuffer
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585 handler.sendbuffer = _sendbuffer
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587 else -- normal connection
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589 handler.readbuffer = _readbuffer
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590 handler.sendbuffer = _sendbuffer
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594 receive = socket.receive
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595 shutdown = ( ssl and id ) or socket.shutdown
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597 _socketlist[ socket ] = handler
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598 _readlistlen = _readlistlen + 1
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599 _readlist[ _readlistlen ] = socket
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600 _readlist[ socket ] = _readlistlen
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602 return handler, socket
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608 idfalse = function( )
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612 removesocket = function( list, socket, len ) -- this function removes sockets from a list ( copied from copas )
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613 local pos = list[ socket ]
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615 list[ socket ] = nil
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616 local last = list[ len ]
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618 if last ~= socket then
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627 closesocket = function( socket )
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628 _sendlistlen = removesocket( _sendlist, socket, _sendlistlen )
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629 _readlistlen = removesocket( _readlist, socket, _readlistlen )
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630 _socketlist[ socket ] = nil
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635 ----------------------------------// PUBLIC //--
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637 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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639 --out_put("server.lua: autossl on ", port, " is ", startssl)
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640 if type( listeners ) ~= "table" then
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641 err = "invalid listener table"
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643 if not type( port ) == "number" or not ( port >= 0 and port <= 65535 ) then
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644 err = "invalid port"
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645 elseif _server[ port ] then
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646 err = "listeners on port '" .. port .. "' already exist"
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647 elseif sslctx and not luasec then
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648 err = "luasec not found"
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651 out_error( "server.lua: ", err )
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655 local server, err = socket_bind( addr, port )
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657 out_error( "server.lua: ", err )
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660 local handler, err = wrapserver( listeners, server, addr, port, pattern, sslctx, maxconnections, startssl ) -- wrap new server socket
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661 if not handler then
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665 server:settimeout( 0 )
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666 _readlistlen = _readlistlen + 1
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667 _readlist[ _readlistlen ] = server
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668 _server[ port ] = handler
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669 _socketlist[ server ] = handler
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670 out_put( "server.lua: new server listener on '", addr, ":", port, "'" )
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674 getserver = function ( port )
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675 return _server[ port ];
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678 removeserver = function( port )
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679 local handler = _server[ port ]
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680 if not handler then
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681 return nil, "no server found on port '" .. tostring( port ) "'"
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687 closeall = function( )
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688 for _, handler in pairs( _socketlist ) do
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690 _socketlist[ _ ] = nil
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703 getsettings = function( )
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704 return _selecttimeout, _sleeptime, _maxsendlen, _maxreadlen, _checkinterval, _sendtimeout, _readtimeout, _cleanqueue, _maxclientsperserver
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707 changesettings = function( new )
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708 if type( new ) ~= "table" then
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709 return nil, "invalid settings table"
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711 _selecttimeout = tonumber( new.timeout ) or _selecttimeout
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712 _sleeptime = tonumber( new.sleeptime ) or _sleeptime
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713 _maxsendlen = tonumber( new.maxsendlen ) or _maxsendlen
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714 _maxreadlen = tonumber( new.maxreadlen ) or _maxreadlen
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715 _checkinterval = tonumber( new.checkinterval ) or _checkinterval
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716 _sendtimeout = tonumber( new.sendtimeout ) or _sendtimeout
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717 _readtimeout = tonumber( new.readtimeout ) or _readtimeout
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718 _cleanqueue = new.cleanqueue
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719 _maxclientsperserver = new._maxclientsperserver or _maxclientsperserver
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723 addtimer = function( listener )
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724 if type( listener ) ~= "function" then
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725 return nil, "invalid listener function"
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727 _timerlistlen = _timerlistlen + 1
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728 _timerlist[ _timerlistlen ] = listener
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732 stats = function( )
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733 return _readtraffic, _sendtraffic, _readlistlen, _sendlistlen, _timerlistlen
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736 local dontstop = true; -- thinking about tomorrow, ...
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738 setquitting = function (quit)
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739 dontstop = not quit;
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743 loop = function( ) -- this is the main loop of the program
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745 local read, write, err = socket_select( _readlist, _sendlist, _selecttimeout )
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746 for i, socket in ipairs( write ) do -- send data waiting in writequeues
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747 local handler = _socketlist[ socket ]
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749 handler.sendbuffer( )
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751 closesocket( socket )
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752 out_put "server.lua: found no handler and closed socket (writelist)" -- this should not happen
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755 for i, socket in ipairs( read ) do -- receive data
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756 local handler = _socketlist[ socket ]
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758 handler.readbuffer( )
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760 closesocket( socket )
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761 out_put "server.lua: found no handler and closed socket (readlist)" -- this can happen
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764 for handler, err in pairs( _closelist ) do
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765 handler.disconnect( )( handler, err )
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766 handler.close( true ) -- forced disconnect
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768 clean( _closelist )
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769 _currenttime = os_time( )
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770 if os_difftime( _currenttime - _timer ) >= 1 then
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771 for i = 1, _timerlistlen do
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772 _timerlist[ i ]( ) -- fire timers
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774 _timer = _currenttime
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776 socket_sleep( _sleeptime ) -- wait some time
\r
777 --collectgarbage( )
\r
782 --// EXPERIMENTAL //--
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784 local wrapclient = function( socket, ip, serverport, listeners, pattern, sslctx, startssl )
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785 local handler = wrapconnection( nil, listeners, socket, ip, serverport, "clientport", pattern, sslctx, startssl )
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786 _socketlist[ socket ] = handler
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787 _sendlistlen = _sendlistlen + 1
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788 _sendlist[ _sendlistlen ] = socket
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789 _sendlist[ socket ] = _sendlistlen
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790 return handler, socket
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793 local addclient = function( address, port, listeners, pattern, sslctx, startssl )
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794 local client, err = luasocket.tcp( )
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798 client:settimeout( 0 )
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799 _, err = client:connect( address, port )
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800 if err then -- try again
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801 local handler = wrapclient( client, address, port, listeners )
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803 wrapconnection( nil, listeners, client, address, port, "clientport", pattern, sslctx, startssl )
\r
807 --// EXPERIMENTAL //--
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809 ----------------------------------// BEGIN //--
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811 use "setmetatable" ( _socketlist, { __mode = "k" } )
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812 use "setmetatable" ( _readtimes, { __mode = "k" } )
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813 use "setmetatable" ( _writetimes, { __mode = "k" } )
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815 _timer = os_time( )
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816 _starttime = os_time( )
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818 addtimer( function( )
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819 local difftime = os_difftime( _currenttime - _starttime )
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820 if difftime > _checkinterval then
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821 _starttime = _currenttime
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822 for handler, timestamp in pairs( _writetimes ) do
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823 if os_difftime( _currenttime - timestamp ) > _sendtimeout then
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824 --_writetimes[ handler ] = nil
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825 handler.disconnect( )( handler, "send timeout" )
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826 handler.close( true ) -- forced disconnect
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829 for handler, timestamp in pairs( _readtimes ) do
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830 if os_difftime( _currenttime - timestamp ) > _readtimeout then
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831 --_readtimes[ handler ] = nil
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832 handler.disconnect( )( handler, "read timeout" )
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833 handler.close( ) -- forced disconnect?
\r
840 ----------------------------------// PUBLIC INTERFACE //--
\r
844 addclient = addclient,
\r
845 wrapclient = wrapclient,
\r
849 closeall = closeall,
\r
850 addtimer = addtimer,
\r
851 addserver = addserver,
\r
852 getserver = getserver,
\r
853 getsettings = getsettings,
\r
854 setquitting = setquitting,
\r
855 removeserver = removeserver,
\r
856 changesettings = changesettings,
\r