/net/server_select.lua
Lua | 1016 lines | 859 code | 115 blank | 42 comment | 110 complexity | d896f2dfcf3dd4410ff07c583da5c655 MD5 | raw file
- --
- -- 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 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 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 )
- dispatch = listeners.onincoming
- disconnect = listeners.ondisconnect
- status = listeners.onstatus
- drain = listeners.ondrain
- handler.onreadtimeout = listeners.onreadtimeout
- 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);
- 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
- 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
- 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?
- 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" 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,
- 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,
- }