3 server.lua by blastbeat of the luadch project
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5 re-used here under the MIT/X Consortium License
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7 - this script contains the server loop of the program
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8 - other scripts can reg a server here
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12 ----------------------------------// DECLARATION //--
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16 local STAT_UNIT = 1 / ( 1024 * 1024 ) -- mb
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18 --// lua functions //--
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20 local function use( what ) return _G[ what ] end
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22 local type = use "type"
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23 local pairs = use "pairs"
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24 local ipairs = use "ipairs"
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25 local tostring = use "tostring"
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26 local collectgarbage = use "collectgarbage"
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30 local table = use "table"
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31 local coroutine = use "coroutine"
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33 --// lua lib methods //--
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35 local table_concat = table.concat
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36 local table_remove = table.remove
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37 local string_sub = use'string'.sub
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38 local coroutine_wrap = coroutine.wrap
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39 local coroutine_yield = coroutine.yield
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40 local print = print;
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41 local out_put = function () end --print;
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42 local out_error = print;
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44 --// extern libs //--
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46 local luasec = require "ssl"
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47 local luasocket = require "socket"
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49 --// extern lib methods //--
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51 local ssl_wrap = ( luasec and luasec.wrap )
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52 local socket_bind = luasocket.bind
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53 local socket_select = luasocket.select
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54 local ssl_newcontext = ( luasec and luasec.newcontext )
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78 --// simple data types //--
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81 local readlen = 0 -- length of readlist
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82 local writelen = 0 -- lenght of writelist
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85 local receivestat = 0
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87 ----------------------------------// DEFINITION //--
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89 listener = { } -- key = port, value = table
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90 readlist = { } -- array with sockets to read from
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91 writelist = { } -- arrary with sockets to write to
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92 socketlist = { } -- key = socket, value = wrapped socket
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96 return receivestat, sendstat
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99 wrapserver = function( listener, socket, ip, serverport, mode, sslctx ) -- this function wraps a server
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101 local dispatch, disconnect = listener.listener, listener.disconnect -- dangerous
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103 local wrapclient, err
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106 if not ssl_newcontext then
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107 return nil, "luasec not found"
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108 -- elseif not cfg_get "use_ssl" then
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109 -- return nil, "ssl is deactivated"
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111 if type( sslctx ) ~= "table" then
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112 out_error "server.lua: wrong server sslctx"
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113 return nil, "wrong server sslctx"
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115 sslctx, err = ssl_newcontext( sslctx )
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117 err = err or "wrong sslctx parameters"
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118 out_error( "server.lua: ", err )
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121 wrapclient = wrapsslclient
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123 wrapclient = wraptcpclient
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126 local accept = socket.accept
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127 local close = socket.close
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129 --// public methods of the object //--
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131 local handler = { }
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133 handler.shutdown = function( ) end
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135 --[[handler.listener = function( data, err )
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136 return ondata( handler, data, err )
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138 handler.ssl = function( )
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139 return sslctx and true or false
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141 handler.close = function( closed )
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142 _ = not closed and close( socket )
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143 writelen = removesocket( writelist, socket, writelen )
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144 readlen = removesocket( readlist, socket, readlen )
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145 socketlist[ socket ] = nil
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148 handler.ip = function( )
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151 handler.serverport = function( )
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154 handler.socket = function( )
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157 handler.receivedata = function( )
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158 local client, err = accept( socket ) -- try to accept
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160 local ip, clientport = client:getpeername( )
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161 client:settimeout( 0 )
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162 local handler, client, err = wrapclient( listener, client, ip, serverport, clientport, mode, sslctx ) -- wrap new client socket
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163 if err then -- error while wrapping ssl socket
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166 out_put( "server.lua: accepted new client connection from ", ip, ":", clientport )
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167 return dispatch( handler )
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168 elseif err then -- maybe timeout or something else
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169 out_put( "server.lua: error with new client connection: ", err )
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176 wrapsslclient = function( listener, socket, ip, serverport, clientport, mode, sslctx ) -- this function wraps a ssl cleint
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178 local dispatch, disconnect = listener.listener, listener.disconnect
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180 --// transform socket to ssl object //--
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183 socket, err = ssl_wrap( socket, sslctx ) -- wrap socket
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185 out_put( "server.lua: ssl error: ", err )
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186 return nil, nil, err -- fatal error
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188 socket:settimeout( 0 )
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190 --// private closures of the object //--
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192 local writequeue = { } -- buffer for messages to send
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194 local eol -- end of buffer
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196 local sstat, rstat = 0, 0
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198 --// local import of socket methods //--
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200 local send = socket.send
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201 local receive = socket.receive
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202 local close = socket.close
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203 --local shutdown = socket.shutdown
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205 --// public methods of the object //--
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207 local handler = { }
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209 handler.getstats = function( )
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210 return rstat, sstat
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213 handler.listener = function( data, err )
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214 return listener( handler, data, err )
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216 handler.ssl = function( )
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219 handler.send = function( _, data, i, j )
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220 return send( socket, data, i, j )
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222 handler.receive = function( pattern, prefix )
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223 return receive( socket, pattern, prefix )
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225 handler.shutdown = function( pattern )
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226 --return shutdown( socket, pattern )
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228 handler.close = function( closed )
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230 writelen = ( eol and removesocket( writelist, socket, writelen ) ) or writelen
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231 readlen = removesocket( readlist, socket, readlen )
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232 socketlist[ socket ] = nil
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233 out_put "server.lua: closed handler and removed socket from list"
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235 handler.ip = function( )
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238 handler.serverport = function( )
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241 handler.clientport = function( )
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245 handler.write = function( data )
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247 writelen = writelen + 1
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248 writelist[ writelen ] = socket
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252 writequeue[ eol ] = data
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254 handler.writequeue = function( )
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257 handler.socket = function( )
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260 handler.mode = function( )
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263 handler._receivedata = function( )
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264 local data, err, part = receive( socket, mode ) -- receive data in "mode"
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265 if not err or ( err == "timeout" or err == "wantread" ) then -- received something
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266 local data = data or part or ""
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267 local count = #data * STAT_UNIT
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268 rstat = rstat + count
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269 receivestat = receivestat + count
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270 out_put( "server.lua: read data '", data, "', error: ", err )
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271 return dispatch( handler, data, err )
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272 else -- connections was closed or fatal error
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273 out_put( "server.lua: client ", ip, ":", clientport, " error: ", err )
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275 disconnect( handler, err )
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281 handler._dispatchdata = function( ) -- this function writes data to handlers
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282 local buffer = table_concat( writequeue, "", 1, eol )
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283 local succ, err, byte = send( socket, buffer )
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284 local count = ( succ or 0 ) * STAT_UNIT
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285 sstat = sstat + count
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286 sendstat = sendstat + count
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287 out_put( "server.lua: sended '", buffer, "', bytes: ", succ, ", error: ", err, ", part: ", byte, ", to: ", ip, ":", clientport )
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288 if succ then -- sending succesful
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291 writelen = removesocket( writelist, socket, writelen ) -- delete socket from writelist
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293 elseif byte and ( err == "timeout" or err == "wantwrite" ) then -- want write
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294 buffer = string_sub( buffer, byte + 1, -1 ) -- new buffer
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295 writequeue[ 1 ] = buffer -- insert new buffer in queue
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298 else -- connection was closed during sending or fatal error
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299 out_put( "server.lua: client ", ip, ":", clientport, " error: ", err )
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301 disconnect( handler, err )
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310 handler.getIp = handler.ip
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311 handler.getPort = handler.clientport
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313 --// handshake //--
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317 handler.handshake = coroutine_wrap( function( client )
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319 for i = 1, 10 do -- 10 handshake attemps
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320 _, err = client:dohandshake( )
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322 out_put( "server.lua: ssl handshake done" )
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323 writelen = ( wrote and removesocket( writelist, socket, writelen ) ) or writelen
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324 handler.receivedata = handler._receivedata -- when handshake is done, replace the handshake function with regular functions
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325 handler.dispatchdata = handler._dispatchdata
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326 return dispatch( handler )
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328 out_put( "server.lua: error during ssl handshake: ", err )
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329 if err == "wantwrite" then
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330 if wrote == nil then
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331 writelen = writelen + 1
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332 writelist[ writelen ] = client
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336 coroutine_yield( handler, nil, err ) -- handshake not finished
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339 _ = err ~= "closed" and close( socket )
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341 disconnect( handler, err )
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344 return false -- handshake failed
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347 handler.receivedata = handler.handshake
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348 handler.dispatchdata = handler.handshake
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350 handler.handshake( socket ) -- do handshake
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352 socketlist[ socket ] = handler
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353 readlen = readlen + 1
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354 readlist[ readlen ] = socket
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356 return handler, socket
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359 wraptcpclient = function( listener, socket, ip, serverport, clientport, mode ) -- this function wraps a socket
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361 local dispatch, disconnect = listener.listener, listener.disconnect
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363 --// private closures of the object //--
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365 local writequeue = { } -- list for messages to send
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369 local rstat, sstat = 0, 0
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371 --// local import of socket methods //--
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373 local send = socket.send
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374 local receive = socket.receive
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375 local close = socket.close
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376 local shutdown = socket.shutdown
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378 --// public methods of the object //--
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380 local handler = { }
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382 handler.getstats = function( )
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383 return rstat, sstat
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386 handler.listener = function( data, err )
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387 return listener( handler, data, err )
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389 handler.ssl = function( )
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392 handler.send = function( _, data, i, j )
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393 return send( socket, data, i, j )
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395 handler.receive = function( pattern, prefix )
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396 return receive( socket, pattern, prefix )
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398 handler.shutdown = function( pattern )
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399 return shutdown( socket, pattern )
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401 handler.close = function( closed )
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402 _ = not closed and shutdown( socket )
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403 _ = not closed and close( socket )
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404 writelen = ( eol and removesocket( writelist, socket, writelen ) ) or writelen
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405 readlen = removesocket( readlist, socket, readlen )
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406 socketlist[ socket ] = nil
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407 out_put "server.lua: closed handler and removed socket from list"
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409 handler.ip = function( )
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412 handler.serverport = function( )
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415 handler.clientport = function( )
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418 handler.write = function( data )
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420 writelen = writelen + 1
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421 writelist[ writelen ] = socket
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425 writequeue[ eol ] = data
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427 handler.writequeue = function( )
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430 handler.socket = function( )
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433 handler.mode = function( )
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436 handler.receivedata = function( )
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437 local data, err, part = receive( socket, mode ) -- receive data in "mode"
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438 if not err or ( err == "timeout" or err == "wantread" ) then -- received something
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439 local data = data or part or ""
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440 local count = #data * STAT_UNIT
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441 rstat = rstat + count
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442 receivestat = receivestat + count
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443 out_put( "server.lua: read data '", data, "', error: ", err )
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444 return dispatch( handler, data, err )
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445 else -- connections was closed or fatal error
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446 out_put( "server.lua: client ", ip, ":", clientport, " error: ", err )
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448 disconnect( handler, err )
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454 handler.dispatchdata = function( ) -- this function writes data to handlers
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455 local buffer = table_concat( writequeue, "", 1, eol )
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456 local succ, err, byte = send( socket, buffer )
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457 local count = ( succ or 0 ) * STAT_UNIT
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458 sstat = sstat + count
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459 sendstat = sendstat + count
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460 out_put( "server.lua: sended '", buffer, "', bytes: ", succ, ", error: ", err, ", part: ", byte, ", to: ", ip, ":", clientport )
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461 if succ then -- sending succesful
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464 writelen = removesocket( writelist, socket, writelen ) -- delete socket from writelist
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466 elseif byte and ( err == "timeout" or err == "wantwrite" ) then -- want write
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467 buffer = string_sub( buffer, byte + 1, -1 ) -- new buffer
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468 writequeue[ 1 ] = buffer -- insert new buffer in queue
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471 else -- connection was closed during sending or fatal error
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472 out_put( "server.lua: client ", ip, ":", clientport, " error: ", err )
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474 disconnect( handler, err )
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483 handler.getIp = handler.ip
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484 handler.getPort = handler.clientport
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486 socketlist[ socket ] = handler
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487 readlen = readlen + 1
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488 readlist[ readlen ] = socket
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490 return handler, socket
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493 addtimer = function( listener )
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494 timelistener[ #timelistener + 1 ] = listener
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497 firetimer = function( listener )
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498 for i, listener in ipairs( timelistener ) do
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503 addserver = function( listeners, port, addr, mode, sslctx ) -- this function provides a way for other scripts to reg a server
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505 if type( listeners ) ~= "table" then
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506 err = "invalid listener table"
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508 for name, func in pairs( listeners ) do
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509 if type( func ) ~= "function" then
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510 err = "invalid listener function"
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515 if not type( port ) == "number" or not ( port >= 0 and port <= 65535 ) then
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516 err = "invalid port"
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517 elseif listener[ port ] then
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518 err= "listeners on port '" .. port .. "' already exist"
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519 elseif sslctx and not luasec then
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520 err = "luasec not found"
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523 out_error( "server.lua: ", err )
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527 local server, err = socket_bind( addr, port )
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529 out_error( "server.lua: ", err )
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532 local handler, err = wrapserver( listeners, server, addr, port, mode, sslctx ) -- wrap new server socket
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533 if not handler then
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537 server:settimeout( 0 )
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538 readlen = readlen + 1
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539 readlist[ readlen ] = server
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540 listener[ port ] = listeners
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541 socketlist[ server ] = handler
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542 out_put( "server.lua: new server listener on ", addr, ":", port )
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546 removesocket = function( tbl, socket, len ) -- this function removes sockets from a list
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547 for i, target in ipairs( tbl ) do
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548 if target == socket then
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550 table_remove( tbl, i )
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557 closeall = function( )
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558 for sock, handler in pairs( socketlist ) do
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559 handler.shutdown( )
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561 socketlist[ sock ] = nil
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563 writelist, readlist, socketlist = { }, { }, { }
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566 closesocket = function( socket )
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567 writelen = removesocket( writelist, socket, writelen )
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568 readlen = removesocket( readlist, socket, readlen )
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569 socketlist[ socket ] = nil
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573 loop = function( ) -- this is the main loop of the program
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574 --signal_set( "hub", "run" )
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576 local read, write, err = socket_select( readlist, writelist, 1 ) -- 1 sec timeout, nice for timers
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577 for i, socket in ipairs( write ) do -- send data waiting in writequeues
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578 local handler = socketlist[ socket ]
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580 handler.dispatchdata( )
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582 closesocket( socket )
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583 out_put "server.lua: found no handler and closed socket (writelist)" -- this should not happen
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586 for i, socket in ipairs( read ) do -- receive data
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587 local handler = socketlist[ socket ]
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589 handler.receivedata( )
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591 closesocket( socket )
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592 out_put "server.lua: found no handler and closed socket (readlist)" -- this can happen
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596 --collectgarbage "collect"
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597 until false --signal_get "hub" ~= "run"
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598 return --signal_get "hub"
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601 ----------------------------------// BEGIN //--
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603 ----------------------------------// PUBLIC INTERFACE //--
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610 closeall = closeall,
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611 addtimer = addtimer,
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