--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/net/server_select.lua Thu Dec 25 10:48:06 2014 +0000
@@ -0,0 +1,1073 @@
+--
+-- server.lua by blastbeat of the luadch project
+-- Re-used here under the MIT/X Consortium License
+--
+-- Modifications (C) 2008-2010 Matthew Wild, Waqas Hussain
+--
+
+-- // wrapping luadch stuff // --
+
+local use = function( what )
+ return _G[ what ]
+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
+
+----------------------------------// DECLARATION //--
+
+--// constants //--
+
+local STAT_UNIT = 1 -- byte
+
+--// lua functions //--
+
+local type = use "type"
+local pairs = use "pairs"
+local ipairs = use "ipairs"
+local tonumber = use "tonumber"
+local tostring = use "tostring"
+
+--// lua libs //--
+
+local os = use "os"
+local table = use "table"
+local string = use "string"
+local coroutine = use "coroutine"
+
+--// lua lib methods //--
+
+local os_difftime = os.difftime
+local math_min = math.min
+local math_huge = math.huge
+local table_concat = table.concat
+local table_insert = table.insert
+local string_sub = string.sub
+local coroutine_wrap = coroutine.wrap
+local coroutine_yield = coroutine.yield
+
+--// extern libs //--
+
+local has_luasec, luasec = pcall ( require , "ssl" )
+local luasocket = use "socket" or require "socket"
+local luasocket_gettime = luasocket.gettime
+local getaddrinfo = luasocket.dns.getaddrinfo
+
+--// extern lib methods //--
+
+local ssl_wrap = ( has_luasec and luasec.wrap )
+local socket_bind = luasocket.bind
+local socket_sleep = luasocket.sleep
+local socket_select = luasocket.select
+
+--// functions //--
+
+local id
+local loop
+local stats
+local idfalse
+local closeall
+local addsocket
+local addserver
+local addtimer
+local getserver
+local wrapserver
+local getsettings
+local closesocket
+local removesocket
+local removeserver
+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 _tcpbacklog
+
+local _starttime
+local _currenttime
+
+local _maxsendlen
+local _maxreadlen
+
+local _checkinterval
+local _sendtimeout
+local _readtimeout
+
+local _timer
+
+local _maxselectlen
+local _maxfd
+
+local _maxsslhandshake
+
+----------------------------------// 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
+_tcpbacklog = 128 -- some kind of hint to the OS
+
+_maxsendlen = 51000 * 1024 -- max len of send buffer
+_maxreadlen = 25000 * 1024 -- max len of read buffer
+
+_checkinterval = 30 -- 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
+
+local is_windows = package.config:sub(1,1) == "\\" -- check the directory separator, to detemine whether this is Windows
+_maxfd = (is_windows and math.huge) or luasocket._SETSIZE or 1024 -- max fd number, limit to 1024 by default to prevent glibc buffer overflow, but not on Windows
+_maxselectlen = luasocket._SETSIZE or 1024 -- But this still applies on Windows
+
+_maxsslhandshake = 30 -- max handshake round-trips
+
+----------------------------------// PRIVATE //--
+
+wrapserver = function( listeners, socket, ip, serverport, pattern, sslctx ) -- this function wraps a server -- FIXME Make sure FD < _maxfd
+
+ if socket:getfd() >= _maxfd then
+ out_error("server.lua: Disallowed FD number: "..socket:getfd())
+ socket:close()
+ return nil, "fd-too-large"
+ end
+
+ local connections = 0
+
+ local dispatch, disconnect = listeners.onconnect, listeners.ondisconnect
+
+ local accept = socket.accept
+
+ --// public methods of the object //--
+
+ local handler = { }
+
+ handler.shutdown = function( ) end
+
+ handler.ssl = function( )
+ return sslctx ~= nil
+ end
+ handler.sslctx = function( )
+ return sslctx
+ end
+ handler.remove = function( )
+ connections = connections - 1
+ if handler then
+ handler.resume( )
+ end
+ end
+ handler.close = function()
+ socket:close( )
+ _sendlistlen = removesocket( _sendlist, socket, _sendlistlen )
+ _readlistlen = removesocket( _readlist, socket, _readlistlen )
+ _server[ip..":"..serverport] = nil;
+ _socketlist[ socket ] = nil
+ handler = nil
+ socket = nil
+ --mem_free( )
+ out_put "server.lua: closed server handler and removed sockets from list"
+ end
+ handler.pause = function( hard )
+ if not handler.paused then
+ _readlistlen = removesocket( _readlist, socket, _readlistlen )
+ if hard then
+ _socketlist[ socket ] = nil
+ socket:close( )
+ socket = nil;
+ end
+ handler.paused = true;
+ end
+ end
+ handler.resume = function( )
+ if handler.paused then
+ if not socket then
+ socket = socket_bind( ip, serverport, _tcpbacklog );
+ socket:settimeout( 0 )
+ end
+ _readlistlen = addsocket(_readlist, socket, _readlistlen)
+ _socketlist[ socket ] = handler
+ handler.paused = false;
+ end
+ end
+ handler.ip = function( )
+ return ip
+ end
+ handler.serverport = function( )
+ return serverport
+ end
+ handler.socket = function( )
+ return socket
+ end
+ handler.readbuffer = function( )
+ if _readlistlen >= _maxselectlen or _sendlistlen >= _maxselectlen then
+ handler.pause( )
+ 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( )
+ local handler, client, err = wrapconnection( handler, listeners, client, ip, serverport, clientport, pattern, sslctx ) -- 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 ", tostring(ip), ":", tostring(clientport), " to ", tostring(serverport))
+ if dispatch and not sslctx then -- SSL connections will notify onconnect when handshake completes
+ return dispatch( handler );
+ end
+ return;
+ elseif err then -- maybe timeout or something else
+ out_put( "server.lua: error with new client connection: ", tostring(err) )
+ return false
+ end
+ end
+ return handler
+end
+
+wrapconnection = function( server, listeners, socket, ip, serverport, clientport, pattern, sslctx ) -- this function wraps a client to a handler object
+
+ if socket:getfd() >= _maxfd then
+ out_error("server.lua: Disallowed FD number: "..socket:getfd()) -- PROTIP: Switch to libevent
+ socket:close( ) -- Should we send some kind of error here?
+ if server then
+ server.pause( )
+ end
+ return nil, nil, "fd-too-large"
+ end
+ socket:settimeout( 0 )
+
+ --// local import of socket methods //--
+
+ local send
+ local receive
+ local shutdown
+
+ --// private closures of the object //--
+
+ local ssl
+
+ local dispatch = listeners.onincoming
+ local status = listeners.onstatus
+ local disconnect = listeners.ondisconnect
+ local drain = listeners.ondrain
+ local onreadtimeout = listeners.onreadtimeout;
+ local detach = listeners.ondetach
+
+ 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.onreadtimeout = onreadtimeout;
+
+ handler.setlistener = function( self, listeners )
+ if detach then
+ detach(self) -- Notify listener that it is no longer responsible for this connection
+ end
+ dispatch = listeners.onincoming
+ disconnect = listeners.ondisconnect
+ status = listeners.onstatus
+ drain = listeners.ondrain
+ handler.onreadtimeout = listeners.onreadtimeout
+ detach = listeners.ondetach
+ end
+ handler.getstats = function( )
+ return readtraffic, sendtraffic
+ end
+ handler.ssl = function( )
+ return ssl
+ end
+ handler.sslctx = function ( )
+ return sslctx
+ 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.setoption = function (self, option, value)
+ if socket.setoption then
+ return socket:setoption(option, value);
+ end
+ return false, "setoption not implemented";
+ end
+ handler.force_close = function ( self, err )
+ if bufferqueuelen ~= 0 then
+ out_put("server.lua: discarding unwritten data for ", tostring(ip), ":", tostring(clientport))
+ bufferqueuelen = 0;
+ end
+ return self:close(err);
+ end
+ handler.close = function( self, err )
+ if not handler then return true; end
+ _readlistlen = removesocket( _readlist, socket, _readlistlen )
+ _readtimes[ handler ] = nil
+ if bufferqueuelen ~= 0 then
+ handler.sendbuffer() -- Try now to send any outstanding data
+ if bufferqueuelen ~= 0 then -- Still not empty, so we'll try again later
+ if handler then
+ handler.write = nil -- ... but no further writing allowed
+ end
+ toclose = true
+ return false
+ end
+ end
+ if socket then
+ _ = shutdown and shutdown( socket )
+ socket:close( )
+ _sendlistlen = removesocket( _sendlist, socket, _sendlistlen )
+ _socketlist[ socket ] = nil
+ socket = nil
+ else
+ out_put "server.lua: socket already closed"
+ end
+ if handler then
+ _writetimes[ handler ] = nil
+ _closelist[ handler ] = nil
+ local _handler = handler;
+ handler = nil
+ if disconnect then
+ disconnect(_handler, err or false);
+ disconnect = nil
+ end
+ end
+ 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
+ handler.port = handler.clientport -- COMPAT server_event
+ local write = function( self, data )
+ bufferlen = bufferlen + #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 = addsocket(_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( self )
+ return bufferqueue
+ end
+ handler.socket = function( self )
+ return socket
+ end
+ handler.set_mode = function( self, new )
+ pattern = new or pattern
+ return pattern
+ end
+ handler.set_send = function ( self, newsend )
+ send = newsend or send
+ return send
+ end
+ handler.bufferlen = function( self, readlen, sendlen )
+ maxsendlen = sendlen or maxsendlen
+ maxreadlen = readlen or maxreadlen
+ return bufferlen, maxreadlen, maxsendlen
+ end
+ --TODO: Deprecate
+ handler.lock_read = function (self, switch)
+ if switch == true then
+ local tmp = _readlistlen
+ _readlistlen = removesocket( _readlist, socket, _readlistlen )
+ _readtimes[ handler ] = nil
+ if _readlistlen ~= tmp then
+ noread = true
+ end
+ elseif switch == false then
+ if noread then
+ noread = false
+ _readlistlen = addsocket(_readlist, socket, _readlistlen)
+ _readtimes[ handler ] = _currenttime
+ end
+ end
+ return noread
+ end
+ handler.pause = function (self)
+ return self:lock_read(true);
+ end
+ handler.resume = function (self)
+ return self:lock_read(false);
+ end
+ handler.lock = function( self, switch )
+ handler.lock_read (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
+ elseif switch == false then
+ handler.write = write
+ 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 == "wantread" or err == "timeout") then -- received something
+ local buffer = buffer or part or ""
+ local len = #buffer
+ if len > maxreadlen then
+ handler:close( "receive buffer exceeded" )
+ return false
+ end
+ local count = len * STAT_UNIT
+ readtraffic = readtraffic + count
+ _readtraffic = _readtraffic + count
+ _readtimes[ handler ] = _currenttime
+ --out_put( "server.lua: read data '", buffer:gsub("[^%w%p ]", "."), "', error: ", err )
+ return dispatch( handler, buffer, err )
+ else -- connections was closed or fatal error
+ out_put( "server.lua: client ", tostring(ip), ":", tostring(clientport), " read error: ", tostring(err) )
+ fatalerror = true
+ _ = handler and handler:force_close( err )
+ return false
+ end
+ end
+ local _sendbuffer = function( ) -- this function sends data
+ local succ, err, byte, buffer, count;
+ if socket then
+ buffer = table_concat( bufferqueue, "", 1, bufferqueuelen )
+ succ, err, byte = send( socket, buffer, 1, bufferlen )
+ count = ( succ or byte or 0 ) * STAT_UNIT
+ sendtraffic = sendtraffic + count
+ _sendtraffic = _sendtraffic + count
+ for i = bufferqueuelen,1,-1 do
+ bufferqueue[ i ] = nil
+ end
+ --out_put( "server.lua: sended '", buffer, "', bytes: ", tostring(succ), ", error: ", tostring(err), ", part: ", tostring(byte), ", to: ", tostring(ip), ":", tostring(clientport) )
+ else
+ succ, err, count = false, "unexpected close", 0;
+ end
+ if succ then -- sending succesful
+ bufferqueuelen = 0
+ bufferlen = 0
+ _sendlistlen = removesocket( _sendlist, socket, _sendlistlen ) -- delete socket from writelist
+ _writetimes[ handler ] = nil
+ if drain then
+ drain(handler)
+ end
+ _ = needtls and handler:starttls(nil)
+ _ = toclose and handler:force_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 ", tostring(ip), ":", tostring(clientport), " write error: ", tostring(err) )
+ fatalerror = true
+ _ = handler and handler:force_close( err )
+ return false
+ end
+ end
+
+ -- Set the sslctx
+ local handshake;
+ function handler.set_sslctx(self, new_sslctx)
+ sslctx = new_sslctx;
+ local read, wrote
+ handshake = coroutine_wrap( function( client ) -- create handshake coroutine
+ local err
+ for i = 1, _maxsslhandshake do
+ _sendlistlen = ( wrote and removesocket( _sendlist, client, _sendlistlen ) ) or _sendlistlen
+ _readlistlen = ( read and removesocket( _readlist, client, _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
+ _ = status and status( handler, "ssl-handshake-complete" )
+ if self.autostart_ssl and listeners.onconnect then
+ listeners.onconnect(self);
+ if bufferqueuelen ~= 0 then
+ _sendlistlen = addsocket(_sendlist, client, _sendlistlen)
+ end
+ end
+ _readlistlen = addsocket(_readlist, client, _readlistlen)
+ return true
+ else
+ if err == "wantwrite" then
+ _sendlistlen = addsocket(_sendlist, client, _sendlistlen)
+ wrote = true
+ elseif err == "wantread" then
+ _readlistlen = addsocket(_readlist, client, _readlistlen)
+ read = true
+ else
+ break;
+ end
+ err = nil;
+ coroutine_yield( ) -- handshake not finished
+ end
+ end
+ out_put( "server.lua: ssl handshake error: ", tostring(err or "handshake too long") )
+ _ = handler and handler:force_close("ssl handshake failed")
+ return false, err -- handshake failed
+ end
+ )
+ end
+ if has_luasec then
+ handler.starttls = function( self, _sslctx)
+ if _sslctx then
+ handler:set_sslctx(_sslctx);
+ end
+ if bufferqueuelen > 0 then
+ out_put "server.lua: we need to do tls, but delaying until send buffer empty"
+ 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
+ if not socket then
+ out_put( "server.lua: error while starting tls on client: ", tostring(err or "unknown error") )
+ 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 = addsocket(_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
+
+ -- Secure now (if handshake fails connection will close)
+ ssl = true
+
+ handler.readbuffer = handshake
+ handler.sendbuffer = handshake
+ return handshake( socket ) -- do handshake
+ end
+ end
+
+ handler.readbuffer = _readbuffer
+ handler.sendbuffer = _sendbuffer
+ send = socket.send
+ receive = socket.receive
+ shutdown = ( ssl and id ) or socket.shutdown
+
+ _socketlist[ socket ] = handler
+ _readlistlen = addsocket(_readlist, socket, _readlistlen)
+
+ if sslctx and has_luasec then
+ out_put "server.lua: auto-starting ssl negotiation..."
+ handler.autostart_ssl = true;
+ local ok, err = handler:starttls(sslctx);
+ if ok == false then
+ return nil, nil, err
+ end
+ end
+
+ return handler, socket
+end
+
+id = function( )
+end
+
+idfalse = function( )
+ return false
+end
+
+addsocket = function( list, socket, len )
+ if not list[ socket ] then
+ len = len + 1
+ list[ len ] = socket
+ list[ socket ] = len
+ end
+ return len;
+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
+
+local function link(sender, receiver, buffersize)
+ local sender_locked;
+ local _sendbuffer = receiver.sendbuffer;
+ function receiver.sendbuffer()
+ _sendbuffer();
+ if sender_locked and receiver.bufferlen() < buffersize then
+ sender:lock_read(false); -- Unlock now
+ sender_locked = nil;
+ end
+ end
+
+ local _readbuffer = sender.readbuffer;
+ function sender.readbuffer()
+ _readbuffer();
+ if not sender_locked and receiver.bufferlen() >= buffersize then
+ sender_locked = true;
+ sender:lock_read(true);
+ end
+ end
+ sender:set_mode("*a");
+end
+
+----------------------------------// PUBLIC //--
+
+addserver = function( addr, port, listeners, pattern, sslctx ) -- this function provides a way for other scripts to reg a server
+ addr = addr or "*"
+ local err
+ if type( listeners ) ~= "table" then
+ err = "invalid listener table"
+ elseif type ( addr ) ~= "string" then
+ err = "invalid address"
+ elseif type( port ) ~= "number" or not ( port >= 0 and port <= 65535 ) then
+ err = "invalid port"
+ elseif _server[ addr..":"..port ] then
+ err = "listeners on '[" .. addr .. "]:" .. port .. "' already exist"
+ elseif sslctx and not has_luasec then
+ err = "luasec not found"
+ end
+ if err then
+ out_error( "server.lua, [", addr, "]:", port, ": ", err )
+ return nil, err
+ end
+ local server, err = socket_bind( addr, port, _tcpbacklog )
+ if err then
+ out_error( "server.lua, [", addr, "]:", port, ": ", err )
+ return nil, err
+ end
+ local handler, err = wrapserver( listeners, server, addr, port, pattern, sslctx ) -- wrap new server socket
+ if not handler then
+ server:close( )
+ return nil, err
+ end
+ server:settimeout( 0 )
+ _readlistlen = addsocket(_readlist, server, _readlistlen)
+ _server[ addr..":"..port ] = handler
+ _socketlist[ server ] = handler
+ out_put( "server.lua: new "..(sslctx and "ssl " or "").."server listener on '[", addr, "]:", port, "'" )
+ return handler
+end
+
+getserver = function ( addr, port )
+ return _server[ addr..":"..port ];
+end
+
+removeserver = function( addr, port )
+ local handler = _server[ addr..":"..port ]
+ if not handler then
+ return nil, "no server found on '[" .. addr .. "]:" .. tostring( port ) .. "'"
+ end
+ handler:close( )
+ _server[ addr..":"..port ] = nil
+ 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 {
+ select_timeout = _selecttimeout;
+ select_sleep_time = _sleeptime;
+ tcp_backlog = _tcpbacklog;
+ max_send_buffer_size = _maxsendlen;
+ max_receive_buffer_size = _maxreadlen;
+ select_idle_check_interval = _checkinterval;
+ send_timeout = _sendtimeout;
+ read_timeout = _readtimeout;
+ max_connections = _maxselectlen;
+ max_ssl_handshake_roundtrips = _maxsslhandshake;
+ highest_allowed_fd = _maxfd;
+ }
+end
+
+changesettings = function( new )
+ if type( new ) ~= "table" then
+ return nil, "invalid settings table"
+ end
+ _selecttimeout = tonumber( new.select_timeout ) or _selecttimeout
+ _sleeptime = tonumber( new.select_sleep_time ) or _sleeptime
+ _maxsendlen = tonumber( new.max_send_buffer_size ) or _maxsendlen
+ _maxreadlen = tonumber( new.max_receive_buffer_size ) or _maxreadlen
+ _checkinterval = tonumber( new.select_idle_check_interval ) or _checkinterval
+ _tcpbacklog = tonumber( new.tcp_backlog ) or _tcpbacklog
+ _sendtimeout = tonumber( new.send_timeout ) or _sendtimeout
+ _readtimeout = tonumber( new.read_timeout ) or _readtimeout
+ _maxselectlen = new.max_connections or _maxselectlen
+ _maxsslhandshake = new.max_ssl_handshake_roundtrips or _maxsslhandshake
+ _maxfd = new.highest_allowed_fd or _maxfd
+ 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
+
+local add_task do
+ local data = {};
+ local new_data = {};
+
+ function add_task(delay, callback)
+ local current_time = luasocket_gettime();
+ delay = delay + current_time;
+ if delay >= current_time then
+ table_insert(new_data, {delay, callback});
+ else
+ local r = callback(current_time);
+ if r and type(r) == "number" then
+ return add_task(r, callback);
+ end
+ end
+ end
+
+ addtimer(function()
+ local current_time = luasocket_gettime();
+ if #new_data > 0 then
+ for _, d in pairs(new_data) do
+ table_insert(data, d);
+ end
+ new_data = {};
+ end
+
+ local next_time = math_huge;
+ for i, d in pairs(data) do
+ local t, callback = d[1], d[2];
+ if t <= current_time then
+ data[i] = nil;
+ local r = callback(current_time);
+ if type(r) == "number" then
+ add_task(r, callback);
+ next_time = math_min(next_time, r);
+ end
+ else
+ next_time = math_min(next_time, t - current_time);
+ end
+ end
+ return next_time;
+ end);
+end
+
+stats = function( )
+ return _readtraffic, _sendtraffic, _readlistlen, _sendlistlen, _timerlistlen
+end
+
+local quitting;
+
+local function setquitting(quit)
+ quitting = not not quit;
+end
+
+loop = function(once) -- this is the main loop of the program
+ if quitting then return "quitting"; end
+ if once then quitting = "once"; end
+ local next_timer_time = math_huge;
+ repeat
+ local read, write, err = socket_select( _readlist, _sendlist, math_min(_selecttimeout, next_timer_time) )
+ 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:force_close() -- forced disconnect
+ _closelist[ handler ] = nil;
+ end
+ _currenttime = luasocket_gettime( )
+
+ -- Check for socket timeouts
+ 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
+ handler.disconnect( )( handler, "send timeout" )
+ handler:force_close() -- forced disconnect
+ end
+ end
+ for handler, timestamp in pairs( _readtimes ) do
+ if os_difftime( _currenttime - timestamp ) > _readtimeout then
+ if not(handler.onreadtimeout) or handler:onreadtimeout() ~= true then
+ handler.disconnect( )( handler, "read timeout" )
+ handler:close( ) -- forced disconnect?
+ else
+ _readtimes[ handler ] = _currenttime -- reset timer
+ end
+ end
+ end
+ end
+
+ -- Fire timers
+ if _currenttime - _timer >= math_min(next_timer_time, 1) then
+ next_timer_time = math_huge;
+ for i = 1, _timerlistlen do
+ local t = _timerlist[ i ]( _currenttime ) -- fire timers
+ if t then next_timer_time = math_min(next_timer_time, t); end
+ end
+ _timer = _currenttime
+ else
+ next_timer_time = next_timer_time - (_currenttime - _timer);
+ end
+
+ -- wait some time (0 by default)
+ socket_sleep( _sleeptime )
+ until quitting;
+ if once and quitting == "once" then quitting = nil; return; end
+ return "quitting"
+end
+
+local function step()
+ return loop(true);
+end
+
+local function get_backend()
+ return "select";
+end
+
+--// EXPERIMENTAL //--
+
+local wrapclient = function( socket, ip, serverport, listeners, pattern, sslctx )
+ local handler, socket, err = wrapconnection( nil, listeners, socket, ip, serverport, "clientport", pattern, sslctx )
+ if not handler then return nil, err end
+ _socketlist[ socket ] = handler
+ if not sslctx then
+ _sendlistlen = addsocket(_sendlist, socket, _sendlistlen)
+ if listeners.onconnect then
+ -- When socket is writeable, call onconnect
+ local _sendbuffer = handler.sendbuffer;
+ handler.sendbuffer = function ()
+ handler.sendbuffer = _sendbuffer;
+ listeners.onconnect(handler);
+ return _sendbuffer(); -- Send any queued outgoing data
+ end
+ end
+ end
+ return handler, socket
+end
+
+local addclient = function( address, port, listeners, pattern, sslctx, typ )
+ local err
+ if type( listeners ) ~= "table" then
+ err = "invalid listener table"
+ elseif type ( address ) ~= "string" then
+ err = "invalid address"
+ elseif type( port ) ~= "number" or not ( port >= 0 and port <= 65535 ) then
+ err = "invalid port"
+ elseif sslctx and not has_luasec then
+ err = "luasec not found"
+ end
+ if getaddrinfo and not typ then
+ local addrinfo, err = getaddrinfo(address)
+ if not addrinfo then return nil, err end
+ if addrinfo[1] and addrinfo[1].family == "inet6" then
+ typ = "tcp6"
+ end
+ end
+ local create = luasocket[typ or "tcp"]
+ if type( create ) ~= "function" then
+ err = "invalid socket type"
+ end
+
+ if err then
+ out_error( "server.lua, addclient: ", err )
+ return nil, err
+ end
+
+ local client, err = create( )
+ if err then
+ return nil, err
+ end
+ client:settimeout( 0 )
+ local ok, err = client:connect( address, port )
+ if ok or err == "timeout" or err == "Operation already in progress" then
+ return wrapclient( client, address, port, listeners, pattern, sslctx )
+ else
+ return nil, err
+ end
+end
+
+--// EXPERIMENTAL //--
+
+----------------------------------// BEGIN //--
+
+use "setmetatable" ( _socketlist, { __mode = "k" } )
+use "setmetatable" ( _readtimes, { __mode = "k" } )
+use "setmetatable" ( _writetimes, { __mode = "k" } )
+
+_timer = luasocket_gettime( )
+_starttime = luasocket_gettime( )
+
+local function setlogger(new_logger)
+ local old_logger = log;
+ if new_logger then
+ log = new_logger;
+ end
+ return old_logger;
+end
+
+----------------------------------// PUBLIC INTERFACE //--
+
+return {
+ _addtimer = addtimer,
+ add_task = add_task;
+
+ addclient = addclient,
+ wrapclient = wrapclient,
+
+ loop = loop,
+ link = link,
+ step = step,
+ stats = stats,
+ closeall = closeall,
+ addserver = addserver,
+ getserver = getserver,
+ setlogger = setlogger,
+ getsettings = getsettings,
+ setquitting = setquitting,
+ removeserver = removeserver,
+ get_backend = get_backend,
+ changesettings = changesettings,
+}