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|
--
-- 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 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 _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(current_time)
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
_currenttime = luasocket_gettime( )
repeat
-- Fire timers
local 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
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
if _currenttime - _starttime > _checkinterval then
_starttime = _currenttime
for handler, timestamp in pairs( _writetimes ) do
if _currenttime - timestamp > _sendtimeout then
handler.disconnect( )( handler, "send timeout" )
handler:force_close() -- forced disconnect
end
end
for handler, timestamp in pairs( _readtimes ) do
if _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
-- 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" } )
_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,
}
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