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-rw-r--r--net/server_select.lua20
1 files changed, 20 insertions, 0 deletions
diff --git a/net/server_select.lua b/net/server_select.lua
index eccc7239..52a0d5f1 100644
--- a/net/server_select.lua
+++ b/net/server_select.lua
@@ -89,6 +89,7 @@ local _socketlist
local _closelist
local _readtimes
local _writetimes
+local _fullservers
--// simple data types //--
@@ -103,6 +104,7 @@ local _readtraffic
local _selecttimeout
local _sleeptime
local _tcpbacklog
+local _accepretry
local _starttime
local _currenttime
@@ -131,6 +133,7 @@ _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
+_fullservers = { } -- servers in a paused state while there are too many clients
_readlistlen = 0 -- length of readlist
_sendlistlen = 0 -- length of sendlist
@@ -142,6 +145,7 @@ _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
+_accepretry = 10 -- seconds to wait until the next attempt of a full server to accept
_maxsendlen = 51000 * 1024 -- max len of send buffer
_maxreadlen = 25000 * 1024 -- max len of read buffer
@@ -210,6 +214,7 @@ wrapserver = function( listeners, socket, ip, serverport, pattern, sslctx ) -- t
socket = nil;
end
handler.paused = true;
+ out_put("server.lua: server [", ip, "]:", serverport, " paused")
end
end
handler.resume = function( )
@@ -220,7 +225,9 @@ wrapserver = function( listeners, socket, ip, serverport, pattern, sslctx ) -- t
end
_readlistlen = addsocket(_readlist, socket, _readlistlen)
_socketlist[ socket ] = handler
+ _fullservers[ handler ] = nil
handler.paused = false;
+ out_put("server.lua: server [", ip, "]:", serverport, " resumed")
end
end
handler.ip = function( )
@@ -235,6 +242,7 @@ wrapserver = function( listeners, socket, ip, serverport, pattern, sslctx ) -- t
handler.readbuffer = function( )
if _readlistlen >= _maxselectlen or _sendlistlen >= _maxselectlen then
handler.pause( )
+ _fullservers[ handler ] = _currenttime
out_put( "server.lua: refused new client connection: server full" )
return false
end
@@ -253,6 +261,8 @@ wrapserver = function( listeners, socket, ip, serverport, pattern, sslctx ) -- t
return;
elseif err then -- maybe timeout or something else
out_put( "server.lua: error with new client connection: ", tostring(err) )
+ handler.pause( )
+ _fullservers[ handler ] = _currenttime
return false
end
end
@@ -265,6 +275,7 @@ wrapconnection = function( server, listeners, socket, ip, serverport, clientport
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
+ _fullservers[ server ] = _currenttime
server.pause( )
end
return nil, nil, "fd-too-large"
@@ -806,6 +817,7 @@ getsettings = function( )
max_connections = _maxselectlen;
max_ssl_handshake_roundtrips = _maxsslhandshake;
highest_allowed_fd = _maxfd;
+ accept_retry_interval = _accepretry;
}
end
@@ -821,6 +833,7 @@ changesettings = function( new )
_tcpbacklog = tonumber( new.tcp_backlog ) or _tcpbacklog
_sendtimeout = tonumber( new.send_timeout ) or _sendtimeout
_readtimeout = tonumber( new.read_timeout ) or _readtimeout
+ _accepretry = tonumber( new.accept_retry_interval ) or _accepretry
_maxselectlen = new.max_connections or _maxselectlen
_maxsslhandshake = new.max_ssl_handshake_roundtrips or _maxsslhandshake
_maxfd = new.highest_allowed_fd or _maxfd
@@ -911,6 +924,13 @@ loop = function(once) -- this is the main loop of the program
next_timer_time = next_timer_time - (_currenttime - _timer);
end
+ for server, paused_time in pairs( _fullservers ) do
+ if _currenttime - paused_time > _accepretry then
+ _fullservers[ server ] = nil;
+ server.resume();
+ end
+ end
+
-- wait some time (0 by default)
socket_sleep( _sleeptime )
until quitting;