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net/server.lua @ 856:946d0f91bd38
mod_muc: Don't bounce error replies in response to errors
author | Matthew Wild <mwild1@gmail.com> |
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date | Mon, 02 Mar 2009 19:50:28 +0000 |
parent | 855:57057f2cbecb |
child | 867:21347a87e185 |
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--[[ server.lua by blastbeat - this script contains the server loop of the program - other scripts can reg a server here ]]-- -- // wrapping luadch stuff // -- local use = function( what ) return _G[ what ] end local clean = function( tbl ) for i, k in pairs( tbl ) do tbl[ i ] = nil end end local log, table_concat = require ("util.logger").init("socket"), table.concat; local out_put = function (...) return log("debug", table_concat{...}); end local out_error = function (...) return log("warn", table_concat{...}); end local mem_free = collectgarbage ----------------------------------// DECLARATION //-- --// constants //-- local STAT_UNIT = 1 -- byte --// lua functions //-- local type = use "type" local pairs = use "pairs" local ipairs = use "ipairs" local tostring = use "tostring" local collectgarbage = use "collectgarbage" --// lua libs //-- local os = use "os" local table = use "table" local string = use "string" local coroutine = use "coroutine" --// lua lib methods //-- local os_time = os.time local os_difftime = os.difftime local table_concat = table.concat local table_remove = table.remove local string_len = string.len local string_sub = string.sub local coroutine_wrap = coroutine.wrap local coroutine_yield = coroutine.yield --// extern libs //-- local luasec = select( 2, pcall( require, "ssl" ) ) local luasocket = require "socket" --// extern lib methods //-- local ssl_wrap = ( luasec and luasec.wrap ) local socket_bind = luasocket.bind local socket_sleep = luasocket.sleep local socket_select = luasocket.select local ssl_newcontext = ( luasec and luasec.newcontext ) --// functions //-- local id local loop local stats local idfalse local addtimer local closeall local addserver local wrapserver local getsettings local closesocket local removesocket local removeserver local changetimeout local wrapconnection local changesettings --// tables //-- local _server local _readlist local _timerlist local _sendlist local _socketlist local _closelist local _readtimes local _writetimes --// simple data types //-- local _ local _readlistlen local _sendlistlen local _timerlistlen local _sendtraffic local _readtraffic local _selecttimeout local _sleeptime local _starttime local _currenttime local _maxsendlen local _maxreadlen local _checkinterval local _sendtimeout local _readtimeout local _cleanqueue local _timer local _maxclientsperserver ----------------------------------// DEFINITION //-- _server = { } -- key = port, value = table; list of listening servers _readlist = { } -- array with sockets to read from _sendlist = { } -- arrary with sockets to write to _timerlist = { } -- array of timer functions _socketlist = { } -- key = socket, value = wrapped socket (handlers) _readtimes = { } -- key = handler, value = timestamp of last data reading _writetimes = { } -- key = handler, value = timestamp of last data writing/sending _closelist = { } -- handlers to close _readlistlen = 0 -- length of readlist _sendlistlen = 0 -- length of sendlist _timerlistlen = 0 -- lenght of timerlist _sendtraffic = 0 -- some stats _readtraffic = 0 _selecttimeout = 1 -- timeout of socket.select _sleeptime = 0 -- time to wait at the end of every loop _maxsendlen = 51000 * 1024 -- max len of send buffer _maxreadlen = 25000 * 1024 -- max len of read buffer _checkinterval = 1200000 -- interval in secs to check idle clients _sendtimeout = 60000 -- allowed send idle time in secs _readtimeout = 6 * 60 * 60 -- allowed read idle time in secs _cleanqueue = false -- clean bufferqueue after using _maxclientsperserver = 1000 ----------------------------------// PRIVATE //-- wrapserver = function( listeners, socket, ip, serverport, pattern, sslctx, maxconnections, startssl ) -- this function wraps a server maxconnections = maxconnections or _maxclientsperserver local connections = 0 local dispatch, disconnect = listeners.incoming or listeners.listener, listeners.disconnect local err local ssl = false if sslctx then if not ssl_newcontext then return nil, "luasec not found" end if type( sslctx ) ~= "table" then out_error "server.lua: wrong server sslctx" return nil, "wrong server sslctx" end sslctx, err = ssl_newcontext( sslctx ) if not sslctx then err = err or "wrong sslctx parameters" out_error( "server.lua: ", err ) return nil, err end ssl = true else out_put("server.lua: ", "ssl not enabled on ", serverport); end local accept = socket.accept --// public methods of the object //-- local handler = { } handler.shutdown = function( ) end handler.ssl = function( ) return ssl end handler.remove = function( ) connections = connections - 1 end handler.close = function( ) for _, handler in pairs( _socketlist ) do if handler.serverport == serverport then handler.disconnect( handler, "server closed" ) handler.close( true ) end end socket:close( ) _sendlistlen = removesocket( _sendlist, socket, _sendlistlen ) _readlistlen = removesocket( _readlist, socket, _readlistlen ) _socketlist[ socket ] = nil handler = nil socket = nil mem_free( ) out_put "server.lua: closed server handler and removed sockets from list" end handler.ip = function( ) return ip end handler.serverport = function( ) return serverport end handler.socket = function( ) return socket end handler.readbuffer = function( ) if connections > maxconnections then out_put( "server.lua: refused new client connection: server full" ) return false end local client, err = accept( socket ) -- try to accept if client then local ip, clientport = client:getpeername( ) client:settimeout( 0 ) local handler, client, err = wrapconnection( handler, listeners, client, ip, serverport, clientport, pattern, sslctx, startssl ) -- wrap new client socket if err then -- error while wrapping ssl socket return false end connections = connections + 1 out_put( "server.lua: accepted new client connection from ", ip, ":", clientport, " to ", serverport) return dispatch( handler ) elseif err then -- maybe timeout or something else out_put( "server.lua: error with new client connection: ", err ) return false end end return handler end wrapconnection = function( server, listeners, socket, ip, serverport, clientport, pattern, sslctx, startssl ) -- this function wraps a client to a handler object socket:settimeout( 0 ) --// local import of socket methods //-- local send local receive local shutdown --// private closures of the object //-- local ssl local dispatch = listeners.incoming or listeners.listener local disconnect = listeners.disconnect local bufferqueue = { } -- buffer array local bufferqueuelen = 0 -- end of buffer array local toclose local fatalerror local needtls local bufferlen = 0 local noread = false local nosend = false local sendtraffic, readtraffic = 0, 0 local maxsendlen = _maxsendlen local maxreadlen = _maxreadlen --// public methods of the object //-- local handler = bufferqueue -- saves a table ^_^ handler.dispatch = function( ) return dispatch end handler.disconnect = function( ) return disconnect end handler.setlistener = function( listeners ) dispatch = listeners.incoming disconnect = listeners.disconnect end handler.getstats = function( ) return readtraffic, sendtraffic end handler.ssl = function( ) return ssl end handler.send = function( _, data, i, j ) return send( socket, data, i, j ) end handler.receive = function( pattern, prefix ) return receive( socket, pattern, prefix ) end handler.shutdown = function( pattern ) return shutdown( socket, pattern ) end handler.close = function( forced ) _readlistlen = removesocket( _readlist, socket, _readlistlen ) _readtimes[ handler ] = nil if bufferqueuelen ~= 0 then if not ( forced or fatalerror ) then handler.sendbuffer( ) if bufferqueuelen ~= 0 then -- try again... handler.write = nil -- ... but no further writing allowed toclose = true return false end else send( socket, table_concat( bufferqueue, "", 1, bufferqueuelen ), 1, bufferlen ) -- forced send end end shutdown( socket ) socket:close( ) _sendlistlen = removesocket( _sendlist, socket, _sendlistlen ) _socketlist[ socket ] = nil _writetimes[ handler ] = nil _closelist[ handler ] = nil handler = nil socket = nil mem_free( ) if server then server.remove( ) end out_put "server.lua: closed client handler and removed socket from list" return true end handler.ip = function( ) return ip end handler.serverport = function( ) return serverport end handler.clientport = function( ) return clientport end local write = function( data ) bufferlen = bufferlen + string_len( data ) if bufferlen > maxsendlen then _closelist[ handler ] = "send buffer exceeded" -- cannot close the client at the moment, have to wait to the end of the cycle handler.write = idfalse -- dont write anymore return false elseif socket and not _sendlist[ socket ] then _sendlistlen = _sendlistlen + 1 _sendlist[ _sendlistlen ] = socket _sendlist[ socket ] = _sendlistlen end bufferqueuelen = bufferqueuelen + 1 bufferqueue[ bufferqueuelen ] = data if handler then _writetimes[ handler ] = _writetimes[ handler ] or _currenttime end return true end handler.write = write handler.bufferqueue = function( ) return bufferqueue end handler.socket = function( ) return socket end handler.pattern = function( new ) pattern = new or pattern return pattern end handler.bufferlen = function( readlen, sendlen ) maxsendlen = sendlen or maxsendlen maxreadlen = readlen or maxreadlen return maxreadlen, maxsendlen end handler.lock = function( switch ) if switch == true then handler.write = idfalse local tmp = _sendlistlen _sendlistlen = removesocket( _sendlist, socket, _sendlistlen ) _writetimes[ handler ] = nil if _sendlistlen ~= tmp then nosend = true end tmp = _readlistlen _readlistlen = removesocket( _readlist, socket, _readlistlen ) _readtimes[ handler ] = nil if _readlistlen ~= tmp then noread = true end elseif switch == false then handler.write = write if noread then noread = false _readlistlen = _readlistlen + 1 _readlist[ socket ] = _readlistlen _readlist[ _readlistlen ] = socket _readtimes[ handler ] = _currenttime end if nosend then nosend = false write( "" ) end end return noread, nosend end local _readbuffer = function( ) -- this function reads data local buffer, err, part = receive( socket, pattern ) -- receive buffer with "pattern" if not err or ( err == "timeout" or err == "wantread" ) then -- received something local buffer = buffer or part or "" local len = string_len( buffer ) if len > maxreadlen then disconnect( handler, "receive buffer exceeded" ) handler.close( true ) return false end local count = len * STAT_UNIT readtraffic = readtraffic + count _readtraffic = _readtraffic + count _readtimes[ handler ] = _currenttime --out_put( "server.lua: read data '", buffer, "', error: ", err ) return dispatch( handler, buffer, err ) else -- connections was closed or fatal error out_put( "server.lua: client ", ip, ":", tostring(clientport), " error: ", tostring(err) ) fatalerror = true disconnect( handler, err ) _ = handler and handler.close( ) return false end end local _sendbuffer = function( ) -- this function sends data local buffer = table_concat( bufferqueue, "", 1, bufferqueuelen ) local succ, err, byte = send( socket, buffer, 1, bufferlen ) local count = ( succ or byte or 0 ) * STAT_UNIT sendtraffic = sendtraffic + count _sendtraffic = _sendtraffic + count _ = _cleanqueue and clean( bufferqueue ) --out_put( "server.lua: sended '", buffer, "', bytes: ", succ, ", error: ", err, ", part: ", byte, ", to: ", ip, ":", clientport ) if succ then -- sending succesful bufferqueuelen = 0 bufferlen = 0 _sendlistlen = removesocket( _sendlist, socket, _sendlistlen ) -- delete socket from writelist _ = needtls and handler.starttls(true) _writetimes[ handler ] = nil _ = toclose and handler.close( ) return true elseif byte and ( err == "timeout" or err == "wantwrite" ) then -- want write buffer = string_sub( buffer, byte + 1, bufferlen ) -- new buffer bufferqueue[ 1 ] = buffer -- insert new buffer in queue bufferqueuelen = 1 bufferlen = bufferlen - byte _writetimes[ handler ] = _currenttime return true else -- connection was closed during sending or fatal error out_put( "server.lua: client ", ip, ":", clientport, " error: ", err ) fatalerror = true disconnect( handler, err ) _ = handler and handler.close( ) return false end end if sslctx then -- ssl? ssl = true local wrote local read local handshake = coroutine_wrap( function( client ) -- create handshake coroutine local err for i = 1, 10 do -- 10 handshake attemps _sendlistlen = ( wrote and removesocket( _sendlist, socket, _sendlistlen ) ) or _sendlistlen _readlistlen = ( read and removesocket( _readlist, socket, _readlistlen ) ) or _readlistlen read, wrote = nil, nil _, err = client:dohandshake( ) if not err then out_put( "server.lua: ssl handshake done" ) handler.readbuffer = _readbuffer -- when handshake is done, replace the handshake function with regular functions handler.sendbuffer = _sendbuffer -- return dispatch( handler ) return true else out_put( "server.lua: error during ssl handshake: ", err ) if err == "wantwrite" and not wrote then _sendlistlen = _sendlistlen + 1 _sendlist[ _sendlistlen ] = client wrote = true elseif err == "wantread" and not read then _readlistlen = _readlistlen + 1 _readlist [ _readlistlen ] = client read = true else break; end --coroutine_yield( handler, nil, err ) -- handshake not finished coroutine_yield( ) end end disconnect( handler, "ssl handshake failed" ) handler.close( true ) -- forced disconnect return false -- handshake failed end ) if startssl then -- ssl now? --out_put("server.lua: ", "starting ssl handshake") local err socket, err = ssl_wrap( socket, sslctx ) -- wrap socket if err then out_put( "server.lua: ssl error: ", err ) mem_free( ) return nil, nil, err -- fatal error end socket:settimeout( 0 ) handler.readbuffer = handshake handler.sendbuffer = handshake handshake( socket ) -- do handshake else handler.starttls = function( now ) if not now then --out_put "server.lua: we need to do tls, but delaying until later" needtls = true return end --out_put( "server.lua: attempting to start tls on " .. tostring( socket ) ) local oldsocket, err = socket socket, err = ssl_wrap( socket, sslctx ) -- wrap socket --out_put( "server.lua: sslwrapped socket is " .. tostring( socket ) ) if err then out_put( "server.lua: error while starting tls on client: ", err ) return nil, err -- fatal error end socket:settimeout( 0 ) -- add the new socket to our system send = socket.send receive = socket.receive shutdown = id _socketlist[ socket ] = handler _readlistlen = _readlistlen + 1 _readlist[ _readlistlen ] = socket _readlist[ socket ] = _readlistlen -- remove traces of the old socket _readlistlen = removesocket( _readlist, oldsocket, _readlistlen ) _sendlistlen = removesocket( _sendlist, oldsocket, _sendlistlen ) _socketlist[ oldsocket ] = nil handler.starttls = nil needtls = nil handler.readbuffer = handshake handler.sendbuffer = handshake handshake( socket ) -- do handshake end handler.readbuffer = _readbuffer handler.sendbuffer = _sendbuffer end else -- normal connection ssl = false handler.readbuffer = _readbuffer handler.sendbuffer = _sendbuffer end send = socket.send receive = socket.receive shutdown = ( ssl and id ) or socket.shutdown _socketlist[ socket ] = handler _readlistlen = _readlistlen + 1 _readlist[ _readlistlen ] = socket _readlist[ socket ] = _readlistlen return handler, socket end id = function( ) end idfalse = function( ) return false end removesocket = function( list, socket, len ) -- this function removes sockets from a list ( copied from copas ) local pos = list[ socket ] if pos then list[ socket ] = nil local last = list[ len ] list[ len ] = nil if last ~= socket then list[ last ] = pos list[ pos ] = last end return len - 1 end return len end closesocket = function( socket ) _sendlistlen = removesocket( _sendlist, socket, _sendlistlen ) _readlistlen = removesocket( _readlist, socket, _readlistlen ) _socketlist[ socket ] = nil socket:close( ) mem_free( ) end ----------------------------------// PUBLIC //-- addserver = function( listeners, port, addr, pattern, sslctx, maxconnections, startssl ) -- this function provides a way for other scripts to reg a server local err --out_put("server.lua: autossl on ", port, " is ", startssl) if type( listeners ) ~= "table" then err = "invalid listener table" end if not type( port ) == "number" or not ( port >= 0 and port <= 65535 ) then err = "invalid port" elseif _server[ port ] then err = "listeners on port '" .. port .. "' already exist" elseif sslctx and not luasec then err = "luasec not found" end if err then out_error( "server.lua: ", err ) return nil, err end addr = addr or "*" local server, err = socket_bind( addr, port ) if err then out_error( "server.lua: ", err ) return nil, err end local handler, err = wrapserver( listeners, server, addr, port, pattern, sslctx, maxconnections, startssl ) -- wrap new server socket if not handler then server:close( ) return nil, err end server:settimeout( 0 ) _readlistlen = _readlistlen + 1 _readlist[ _readlistlen ] = server _server[ port ] = handler _socketlist[ server ] = handler out_put( "server.lua: new server listener on '", addr, ":", port, "'" ) return handler end removeserver = function( port ) local handler = _server[ port ] if not handler then return nil, "no server found on port '" .. tostring( port ) "'" end handler.close( ) return true end closeall = function( ) for _, handler in pairs( _socketlist ) do handler.close( ) _socketlist[ _ ] = nil end _readlistlen = 0 _sendlistlen = 0 _timerlistlen = 0 _server = { } _readlist = { } _sendlist = { } _timerlist = { } _socketlist = { } mem_free( ) end getsettings = function( ) return _selecttimeout, _sleeptime, _maxsendlen, _maxreadlen, _checkinterval, _sendtimeout, _readtimeout, _cleanqueue, _maxclientsperserver end changesettings = function( new ) if type( new ) ~= "table" then return nil, "invalid settings table" end _selecttimeout = tonumber( new.timeout ) or _selecttimeout _sleeptime = tonumber( new.sleeptime ) or _sleeptime _maxsendlen = tonumber( new.maxsendlen ) or _maxsendlen _maxreadlen = tonumber( new.maxreadlen ) or _maxreadlen _checkinterval = tonumber( new.checkinterval ) or _checkinterval _sendtimeout = tonumber( new.sendtimeout ) or _sendtimeout _readtimeout = tonumber( new.readtimeout ) or _readtimeout _cleanqueue = new.cleanqueue _maxclientsperserver = new._maxclientsperserver or _maxclientsperserver return true end addtimer = function( listener ) if type( listener ) ~= "function" then return nil, "invalid listener function" end _timerlistlen = _timerlistlen + 1 _timerlist[ _timerlistlen ] = listener return true end stats = function( ) return _readtraffic, _sendtraffic, _readlistlen, _sendlistlen, _timerlistlen end loop = function( ) -- this is the main loop of the program while true do local read, write, err = socket_select( _readlist, _sendlist, _selecttimeout ) for i, socket in ipairs( write ) do -- send data waiting in writequeues local handler = _socketlist[ socket ] if handler then handler.sendbuffer( ) else closesocket( socket ) out_put "server.lua: found no handler and closed socket (writelist)" -- this should not happen end end for i, socket in ipairs( read ) do -- receive data local handler = _socketlist[ socket ] if handler then handler.readbuffer( ) else closesocket( socket ) out_put "server.lua: found no handler and closed socket (readlist)" -- this can happen end end for handler, err in pairs( _closelist ) do handler.disconnect( )( handler, err ) handler.close( true ) -- forced disconnect end clean( _closelist ) _currenttime = os_time( ) if os_difftime( _currenttime - _timer ) >= 1 then for i = 1, _timerlistlen do _timerlist[ i ]( ) -- fire timers end _timer = _currenttime end socket_sleep( _sleeptime ) -- wait some time --collectgarbage( ) end end --// EXPERIMENTAL //-- local wrapclient = function( socket, ip, serverport, listeners, pattern, sslctx, startssl ) local handler = wrapconnection( nil, listeners, socket, ip, serverport, "clientport", pattern, sslctx, startssl ) _socketlist[ socket ] = handler _sendlistlen = _sendlistlen + 1 _sendlist[ _sendlistlen ] = socket _sendlist[ socket ] = _sendlistlen return handler, socket end local addclient = function( address, port, listeners, pattern, sslctx, startssl ) local client, err = socket.tcp( ) if err then return nil, err end client:settimeout( 0 ) _, err = client:connect( address, port ) if err then -- try again local handler = wrapclient( client, address, port, listeners ) else wrapconnection( server, listeners, socket, address, port, "clientport", pattern, sslctx, startssl ) end end --// EXPERIMENTAL //-- ----------------------------------// BEGIN //-- use "setmetatable" ( _socketlist, { __mode = "k" } ) use "setmetatable" ( _readtimes, { __mode = "k" } ) use "setmetatable" ( _writetimes, { __mode = "k" } ) _timer = os_time( ) _starttime = os_time( ) addtimer( function( ) local difftime = os_difftime( _currenttime - _starttime ) if difftime > _checkinterval then _starttime = _currenttime for handler, timestamp in pairs( _writetimes ) do if os_difftime( _currenttime - timestamp ) > _sendtimeout then --_writetimes[ handler ] = nil handler.disconnect( )( handler, "send timeout" ) handler.close( true ) -- forced disconnect end end for handler, timestamp in pairs( _readtimes ) do if os_difftime( _currenttime - timestamp ) > _readtimeout then --_readtimes[ handler ] = nil handler.disconnect( )( handler, "read timeout" ) handler.close( ) -- forced disconnect? end end end end ) ----------------------------------// PUBLIC INTERFACE //-- return { addclient = addclient, wrapclient = wrapclient, loop = loop, stats = stats, closeall = closeall, addtimer = addtimer, addserver = addserver, getsettings = getsettings, removeserver = removeserver, changesettings = changesettings, }