--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/net/server_event.lua Thu Dec 25 10:48:06 2014 +0000
@@ -0,0 +1,891 @@
+--[[
+
+
+ server.lua based on lua/libevent by blastbeat
+
+ notes:
+ -- when using luaevent, never register 2 or more EV_READ at one socket, same for EV_WRITE
+ -- you cant even register a new EV_READ/EV_WRITE callback inside another one
+ -- to do some of the above, use timeout events or something what will called from outside
+ -- dont let garbagecollect eventcallbacks, as long they are running
+ -- when using luasec, there are 4 cases of timeout errors: wantread or wantwrite during reading or writing
+
+--]]
+
+local SCRIPT_NAME = "server_event.lua"
+local SCRIPT_VERSION = "0.05"
+local SCRIPT_AUTHOR = "blastbeat"
+local LAST_MODIFIED = "2009/11/20"
+
+local cfg = {
+ MAX_CONNECTIONS = 100000, -- max per server connections (use "ulimit -n" on *nix)
+ MAX_HANDSHAKE_ATTEMPTS= 1000, -- attempts to finish ssl handshake
+ HANDSHAKE_TIMEOUT = 60, -- timeout in seconds per handshake attempt
+ MAX_READ_LENGTH = 1024 * 1024 * 1024 * 1024, -- max bytes allowed to read from sockets
+ MAX_SEND_LENGTH = 1024 * 1024 * 1024 * 1024, -- max bytes size of write buffer (for writing on sockets)
+ ACCEPT_QUEUE = 128, -- might influence the length of the pending sockets queue
+ ACCEPT_DELAY = 10, -- seconds to wait until the next attempt of a full server to accept
+ READ_TIMEOUT = 60 * 60 * 6, -- timeout in seconds for read data from socket
+ WRITE_TIMEOUT = 180, -- timeout in seconds for write data on socket
+ CONNECT_TIMEOUT = 20, -- timeout in seconds for connection attempts
+ CLEAR_DELAY = 5, -- seconds to wait for clearing interface list (and calling ondisconnect listeners)
+ DEBUG = true, -- show debug messages
+}
+
+local function use(x) return rawget(_G, x); end
+local ipairs = use "ipairs"
+local string = use "string"
+local select = use "select"
+local require = use "require"
+local tostring = use "tostring"
+local coroutine = use "coroutine"
+local setmetatable = use "setmetatable"
+
+local t_insert = table.insert
+local t_concat = table.concat
+
+local has_luasec, ssl = pcall ( require , "ssl" )
+local socket = use "socket" or require "socket"
+local getaddrinfo = socket.dns.getaddrinfo
+
+local log = require ("util.logger").init("socket")
+
+local function debug(...)
+ return log("debug", ("%s "):rep(select('#', ...)), ...)
+end
+local vdebug = debug;
+
+local bitor = ( function( ) -- thx Rici Lake
+ local hasbit = function( x, p )
+ return x % ( p + p ) >= p
+ end
+ return function( x, y )
+ local p = 1
+ local z = 0
+ local limit = x > y and x or y
+ while p <= limit do
+ if hasbit( x, p ) or hasbit( y, p ) then
+ z = z + p
+ end
+ p = p + p
+ end
+ return z
+ end
+end )( )
+
+local event = require "luaevent.core"
+local base = event.new( )
+local EV_READ = event.EV_READ
+local EV_WRITE = event.EV_WRITE
+local EV_TIMEOUT = event.EV_TIMEOUT
+local EV_SIGNAL = event.EV_SIGNAL
+
+local EV_READWRITE = bitor( EV_READ, EV_WRITE )
+
+local interfacelist = ( function( ) -- holds the interfaces for sockets
+ local array = { }
+ local len = 0
+ return function( method, arg )
+ if "add" == method then
+ len = len + 1
+ array[ len ] = arg
+ arg:_position( len )
+ return len
+ elseif "delete" == method then
+ if len <= 0 then
+ return nil, "array is already empty"
+ end
+ local position = arg:_position() -- get position in array
+ if position ~= len then
+ local interface = array[ len ] -- get last interface
+ array[ position ] = interface -- copy it into free position
+ array[ len ] = nil -- free last position
+ interface:_position( position ) -- set new position in array
+ else -- free last position
+ array[ len ] = nil
+ end
+ len = len - 1
+ return len
+ else
+ return array
+ end
+ end
+end )( )
+
+-- Client interface methods
+local interface_mt
+do
+ interface_mt = {}; interface_mt.__index = interface_mt;
+
+ local addevent = base.addevent
+ local coroutine_wrap, coroutine_yield = coroutine.wrap,coroutine.yield
+
+ -- Private methods
+ function interface_mt:_position(new_position)
+ self.position = new_position or self.position
+ return self.position;
+ end
+ function interface_mt:_close()
+ return self:_destroy();
+ end
+
+ function interface_mt:_start_connection(plainssl) -- called from wrapclient
+ local callback = function( event )
+ if EV_TIMEOUT == event then -- timeout during connection
+ self.fatalerror = "connection timeout"
+ self:ontimeout() -- call timeout listener
+ self:_close()
+ debug( "new connection failed. id:", self.id, "error:", self.fatalerror )
+ else
+ if plainssl and has_luasec then -- start ssl session
+ self:starttls(self._sslctx, true)
+ else -- normal connection
+ self:_start_session(true)
+ end
+ debug( "new connection established. id:", self.id )
+ end
+ self.eventconnect = nil
+ return -1
+ end
+ self.eventconnect = addevent( base, self.conn, EV_WRITE, callback, cfg.CONNECT_TIMEOUT )
+ return true
+ end
+ function interface_mt:_start_session(call_onconnect) -- new session, for example after startssl
+ if self.type == "client" then
+ local callback = function( )
+ self:_lock( false, false, false )
+ --vdebug( "start listening on client socket with id:", self.id )
+ self.eventread = addevent( base, self.conn, EV_READ, self.readcallback, cfg.READ_TIMEOUT ); -- register callback
+ if call_onconnect then
+ self:onconnect()
+ end
+ self.eventsession = nil
+ return -1
+ end
+ self.eventsession = addevent( base, nil, EV_TIMEOUT, callback, 0 )
+ else
+ self:_lock( false )
+ --vdebug( "start listening on server socket with id:", self.id )
+ self.eventread = addevent( base, self.conn, EV_READ, self.readcallback ) -- register callback
+ end
+ return true
+ end
+ function interface_mt:_start_ssl(call_onconnect) -- old socket will be destroyed, therefore we have to close read/write events first
+ --vdebug( "starting ssl session with client id:", self.id )
+ local _
+ _ = self.eventread and self.eventread:close( ) -- close events; this must be called outside of the event callbacks!
+ _ = self.eventwrite and self.eventwrite:close( )
+ self.eventread, self.eventwrite = nil, nil
+ local err
+ self.conn, err = ssl.wrap( self.conn, self._sslctx )
+ if err then
+ self.fatalerror = err
+ self.conn = nil -- cannot be used anymore
+ if call_onconnect then
+ self.ondisconnect = nil -- dont call this when client isnt really connected
+ end
+ self:_close()
+ debug( "fatal error while ssl wrapping:", err )
+ return false
+ end
+ self.conn:settimeout( 0 ) -- set non blocking
+ local handshakecallback = coroutine_wrap(
+ function( event )
+ local _, err
+ local attempt = 0
+ local maxattempt = cfg.MAX_HANDSHAKE_ATTEMPTS
+ while attempt < maxattempt do -- no endless loop
+ attempt = attempt + 1
+ debug( "ssl handshake of client with id:"..tostring(self)..", attempt:"..attempt )
+ if attempt > maxattempt then
+ self.fatalerror = "max handshake attempts exceeded"
+ elseif EV_TIMEOUT == event then
+ self.fatalerror = "timeout during handshake"
+ else
+ _, err = self.conn:dohandshake( )
+ if not err then
+ self:_lock( false, false, false ) -- unlock the interface; sending, closing etc allowed
+ self.send = self.conn.send -- caching table lookups with new client object
+ self.receive = self.conn.receive
+ if not call_onconnect then -- trigger listener
+ self:onstatus("ssl-handshake-complete");
+ end
+ self:_start_session( call_onconnect )
+ debug( "ssl handshake done" )
+ self.eventhandshake = nil
+ return -1
+ end
+ if err == "wantwrite" then
+ event = EV_WRITE
+ elseif err == "wantread" then
+ event = EV_READ
+ else
+ debug( "ssl handshake error:", err )
+ self.fatalerror = err
+ end
+ end
+ if self.fatalerror then
+ if call_onconnect then
+ self.ondisconnect = nil -- dont call this when client isnt really connected
+ end
+ self:_close()
+ debug( "handshake failed because:", self.fatalerror )
+ self.eventhandshake = nil
+ return -1
+ end
+ event = coroutine_yield( event, cfg.HANDSHAKE_TIMEOUT ) -- yield this monster...
+ end
+ end
+ )
+ debug "starting handshake..."
+ self:_lock( false, true, true ) -- unlock read/write events, but keep interface locked
+ self.eventhandshake = addevent( base, self.conn, EV_READWRITE, handshakecallback, cfg.HANDSHAKE_TIMEOUT )
+ return true
+ end
+ function interface_mt:_destroy() -- close this interface + events and call last listener
+ debug( "closing client with id:", self.id, self.fatalerror )
+ self:_lock( true, true, true ) -- first of all, lock the interface to avoid further actions
+ local _
+ _ = self.eventread and self.eventread:close( )
+ if self.type == "client" then
+ _ = self.eventwrite and self.eventwrite:close( )
+ _ = self.eventhandshake and self.eventhandshake:close( )
+ _ = self.eventstarthandshake and self.eventstarthandshake:close( )
+ _ = self.eventconnect and self.eventconnect:close( )
+ _ = self.eventsession and self.eventsession:close( )
+ _ = self.eventwritetimeout and self.eventwritetimeout:close( )
+ _ = self.eventreadtimeout and self.eventreadtimeout:close( )
+ _ = self.ondisconnect and self:ondisconnect( self.fatalerror ~= "client to close" and self.fatalerror) -- call ondisconnect listener (wont be the case if handshake failed on connect)
+ _ = self.conn and self.conn:close( ) -- close connection
+ _ = self._server and self._server:counter(-1);
+ self.eventread, self.eventwrite = nil, nil
+ self.eventstarthandshake, self.eventhandshake, self.eventclose = nil, nil, nil
+ self.readcallback, self.writecallback = nil, nil
+ else
+ self.conn:close( )
+ self.eventread, self.eventclose = nil, nil
+ self.interface, self.readcallback = nil, nil
+ end
+ interfacelist( "delete", self )
+ return true
+ end
+
+ function interface_mt:_lock(nointerface, noreading, nowriting) -- lock or unlock this interface or events
+ self.nointerface, self.noreading, self.nowriting = nointerface, noreading, nowriting
+ return nointerface, noreading, nowriting
+ end
+
+ --TODO: Deprecate
+ function interface_mt:lock_read(switch)
+ if switch then
+ return self:pause();
+ else
+ return self:resume();
+ end
+ end
+
+ function interface_mt:pause()
+ return self:_lock(self.nointerface, true, self.nowriting);
+ end
+
+ function interface_mt:resume()
+ self:_lock(self.nointerface, false, self.nowriting);
+ if not self.eventread then
+ self.eventread = addevent( base, self.conn, EV_READ, self.readcallback, cfg.READ_TIMEOUT ); -- register callback
+ end
+ end
+
+ function interface_mt:counter(c)
+ if c then
+ self._connections = self._connections + c
+ end
+ return self._connections
+ end
+
+ -- Public methods
+ function interface_mt:write(data)
+ if self.nowriting then return nil, "locked" end
+ --vdebug( "try to send data to client, id/data:", self.id, data )
+ data = tostring( data )
+ local len = #data
+ local total = len + self.writebufferlen
+ if total > cfg.MAX_SEND_LENGTH then -- check buffer length
+ local err = "send buffer exceeded"
+ debug( "error:", err ) -- to much, check your app
+ return nil, err
+ end
+ t_insert(self.writebuffer, data) -- new buffer
+ self.writebufferlen = total
+ if not self.eventwrite then -- register new write event
+ --vdebug( "register new write event" )
+ self.eventwrite = addevent( base, self.conn, EV_WRITE, self.writecallback, cfg.WRITE_TIMEOUT )
+ end
+ return true
+ end
+ function interface_mt:close()
+ if self.nointerface then return nil, "locked"; end
+ debug( "try to close client connection with id:", self.id )
+ if self.type == "client" then
+ self.fatalerror = "client to close"
+ if self.eventwrite then -- wait for incomplete write request
+ self:_lock( true, true, false )
+ debug "closing delayed until writebuffer is empty"
+ return nil, "writebuffer not empty, waiting"
+ else -- close now
+ self:_lock( true, true, true )
+ self:_close()
+ return true
+ end
+ else
+ debug( "try to close server with id:", tostring(self.id))
+ self.fatalerror = "server to close"
+ self:_lock( true )
+ self:_close( 0 )
+ return true
+ end
+ end
+
+ function interface_mt:socket()
+ return self.conn
+ end
+
+ function interface_mt:server()
+ return self._server or self;
+ end
+
+ function interface_mt:port()
+ return self._port
+ end
+
+ function interface_mt:serverport()
+ return self._serverport
+ end
+
+ function interface_mt:ip()
+ return self._ip
+ end
+
+ function interface_mt:ssl()
+ return self._usingssl
+ end
+ interface_mt.clientport = interface_mt.port -- COMPAT server_select
+
+ function interface_mt:type()
+ return self._type or "client"
+ end
+
+ function interface_mt:connections()
+ return self._connections
+ end
+
+ function interface_mt:address()
+ return self.addr
+ end
+
+ function interface_mt:set_sslctx(sslctx)
+ self._sslctx = sslctx;
+ if sslctx then
+ self.starttls = nil; -- use starttls() of interface_mt
+ else
+ self.starttls = false; -- prevent starttls()
+ end
+ end
+
+ function interface_mt:set_mode(pattern)
+ if pattern then
+ self._pattern = pattern;
+ end
+ return self._pattern;
+ end
+
+ function interface_mt:set_send(new_send)
+ -- No-op, we always use the underlying connection's send
+ end
+
+ function interface_mt:starttls(sslctx, call_onconnect)
+ debug( "try to start ssl at client id:", self.id )
+ local err
+ self._sslctx = sslctx;
+ if self._usingssl then -- startssl was already called
+ err = "ssl already active"
+ end
+ if err then
+ debug( "error:", err )
+ return nil, err
+ end
+ self._usingssl = true
+ self.startsslcallback = function( ) -- we have to start the handshake outside of a read/write event
+ self.startsslcallback = nil
+ self:_start_ssl(call_onconnect);
+ self.eventstarthandshake = nil
+ return -1
+ end
+ if not self.eventwrite then
+ self:_lock( true, true, true ) -- lock the interface, to not disturb the handshake
+ self.eventstarthandshake = addevent( base, nil, EV_TIMEOUT, self.startsslcallback, 0 ) -- add event to start handshake
+ else -- wait until writebuffer is empty
+ self:_lock( true, true, false )
+ debug "ssl session delayed until writebuffer is empty..."
+ end
+ self.starttls = false;
+ return true
+ end
+
+ function interface_mt:setoption(option, value)
+ if self.conn.setoption then
+ return self.conn:setoption(option, value);
+ end
+ return false, "setoption not implemented";
+ end
+
+ function interface_mt:setlistener(listener)
+ self:ondetach(); -- Notify listener that it is no longer responsible for this connection
+ self.onconnect, self.ondisconnect, self.onincoming, self.ontimeout,
+ self.onreadtimeout, self.onstatus, self.ondetach
+ = listener.onconnect, listener.ondisconnect, listener.onincoming, listener.ontimeout,
+ listener.onreadtimeout, listener.onstatus, listener.ondetach;
+ end
+
+ -- Stub handlers
+ function interface_mt:onconnect()
+ end
+ function interface_mt:onincoming()
+ end
+ function interface_mt:ondisconnect()
+ end
+ function interface_mt:ontimeout()
+ end
+ function interface_mt:onreadtimeout()
+ self.fatalerror = "timeout during receiving"
+ debug( "connection failed:", self.fatalerror )
+ self:_close()
+ self.eventread = nil
+ end
+ function interface_mt:ondrain()
+ end
+ function interface_mt:ondetach()
+ end
+ function interface_mt:onstatus()
+ end
+end
+
+-- End of client interface methods
+
+local handleclient;
+do
+ local string_sub = string.sub -- caching table lookups
+ local addevent = base.addevent
+ local socket_gettime = socket.gettime
+ function handleclient( client, ip, port, server, pattern, listener, sslctx ) -- creates an client interface
+ --vdebug("creating client interfacce...")
+ local interface = {
+ type = "client";
+ conn = client;
+ currenttime = socket_gettime( ); -- safe the origin
+ writebuffer = {}; -- writebuffer
+ writebufferlen = 0; -- length of writebuffer
+ send = client.send; -- caching table lookups
+ receive = client.receive;
+ onconnect = listener.onconnect; -- will be called when client disconnects
+ ondisconnect = listener.ondisconnect; -- will be called when client disconnects
+ onincoming = listener.onincoming; -- will be called when client sends data
+ ontimeout = listener.ontimeout; -- called when fatal socket timeout occurs
+ onreadtimeout = listener.onreadtimeout; -- called when socket inactivity timeout occurs
+ ondrain = listener.ondrain; -- called when writebuffer is empty
+ ondetach = listener.ondetach; -- called when disassociating this listener from this connection
+ onstatus = listener.onstatus; -- called for status changes (e.g. of SSL/TLS)
+ eventread = false, eventwrite = false, eventclose = false,
+ eventhandshake = false, eventstarthandshake = false; -- event handler
+ eventconnect = false, eventsession = false; -- more event handler...
+ eventwritetimeout = false; -- even more event handler...
+ eventreadtimeout = false;
+ fatalerror = false; -- error message
+ writecallback = false; -- will be called on write events
+ readcallback = false; -- will be called on read events
+ nointerface = true; -- lock/unlock parameter of this interface
+ noreading = false, nowriting = false; -- locks of the read/writecallback
+ startsslcallback = false; -- starting handshake callback
+ position = false; -- position of client in interfacelist
+
+ -- Properties
+ _ip = ip, _port = port, _server = server, _pattern = pattern,
+ _serverport = (server and server:port() or nil),
+ _sslctx = sslctx; -- parameters
+ _usingssl = false; -- client is using ssl;
+ }
+ if not has_luasec then interface.starttls = false; end
+ interface.id = tostring(interface):match("%x+$");
+ interface.writecallback = function( event ) -- called on write events
+ --vdebug( "new client write event, id/ip/port:", interface, ip, port )
+ if interface.nowriting or ( interface.fatalerror and ( "client to close" ~= interface.fatalerror ) ) then -- leave this event
+ --vdebug( "leaving this event because:", interface.nowriting or interface.fatalerror )
+ interface.eventwrite = false
+ return -1
+ end
+ if EV_TIMEOUT == event then -- took too long to write some data to socket -> disconnect
+ interface.fatalerror = "timeout during writing"
+ debug( "writing failed:", interface.fatalerror )
+ interface:_close()
+ interface.eventwrite = false
+ return -1
+ else -- can write :)
+ if interface._usingssl then -- handle luasec
+ if interface.eventreadtimeout then -- we have to read first
+ local ret = interface.readcallback( ) -- call readcallback
+ --vdebug( "tried to read in writecallback, result:", ret )
+ end
+ if interface.eventwritetimeout then -- luasec only
+ interface.eventwritetimeout:close( ) -- first we have to close timeout event which where regged after a wantread error
+ interface.eventwritetimeout = false
+ end
+ end
+ interface.writebuffer = { t_concat(interface.writebuffer) }
+ local succ, err, byte = interface.conn:send( interface.writebuffer[1], 1, interface.writebufferlen )
+ --vdebug( "write data:", interface.writebuffer, "error:", err, "part:", byte )
+ if succ then -- writing succesful
+ interface.writebuffer[1] = nil
+ interface.writebufferlen = 0
+ interface:ondrain();
+ if interface.fatalerror then
+ debug "closing client after writing"
+ interface:_close() -- close interface if needed
+ elseif interface.startsslcallback then -- start ssl connection if needed
+ debug "starting ssl handshake after writing"
+ interface.eventstarthandshake = addevent( base, nil, EV_TIMEOUT, interface.startsslcallback, 0 )
+ elseif interface.eventreadtimeout then
+ return EV_WRITE, EV_TIMEOUT
+ end
+ interface.eventwrite = nil
+ return -1
+ elseif byte and (err == "timeout" or err == "wantwrite") then -- want write again
+ --vdebug( "writebuffer is not empty:", err )
+ interface.writebuffer[1] = string_sub( interface.writebuffer[1], byte + 1, interface.writebufferlen ) -- new buffer
+ interface.writebufferlen = interface.writebufferlen - byte
+ if "wantread" == err then -- happens only with luasec
+ local callback = function( )
+ interface:_close()
+ interface.eventwritetimeout = nil
+ return -1;
+ end
+ interface.eventwritetimeout = addevent( base, nil, EV_TIMEOUT, callback, cfg.WRITE_TIMEOUT ) -- reg a new timeout event
+ debug( "wantread during write attempt, reg it in readcallback but dont know what really happens next..." )
+ -- hopefully this works with luasec; its simply not possible to use 2 different write events on a socket in luaevent
+ return -1
+ end
+ return EV_WRITE, cfg.WRITE_TIMEOUT
+ else -- connection was closed during writing or fatal error
+ interface.fatalerror = err or "fatal error"
+ debug( "connection failed in write event:", interface.fatalerror )
+ interface:_close()
+ interface.eventwrite = nil
+ return -1
+ end
+ end
+ end
+
+ interface.readcallback = function( event ) -- called on read events
+ --vdebug( "new client read event, id/ip/port:", tostring(interface.id), tostring(ip), tostring(port) )
+ if interface.noreading or interface.fatalerror then -- leave this event
+ --vdebug( "leaving this event because:", tostring(interface.noreading or interface.fatalerror) )
+ interface.eventread = nil
+ return -1
+ end
+ if EV_TIMEOUT == event and interface:onreadtimeout() ~= true then
+ return -1 -- took too long to get some data from client -> disconnect
+ end
+ if interface._usingssl then -- handle luasec
+ if interface.eventwritetimeout then -- ok, in the past writecallback was regged
+ local ret = interface.writecallback( ) -- call it
+ --vdebug( "tried to write in readcallback, result:", tostring(ret) )
+ end
+ if interface.eventreadtimeout then
+ interface.eventreadtimeout:close( )
+ interface.eventreadtimeout = nil
+ end
+ end
+ local buffer, err, part = interface.conn:receive( interface._pattern ) -- receive buffer with "pattern"
+ --vdebug( "read data:", tostring(buffer), "error:", tostring(err), "part:", tostring(part) )
+ buffer = buffer or part
+ if buffer and #buffer > cfg.MAX_READ_LENGTH then -- check buffer length
+ interface.fatalerror = "receive buffer exceeded"
+ debug( "fatal error:", interface.fatalerror )
+ interface:_close()
+ interface.eventread = nil
+ return -1
+ end
+ if err and ( err ~= "timeout" and err ~= "wantread" ) then
+ if "wantwrite" == err then -- need to read on write event
+ if not interface.eventwrite then -- register new write event if needed
+ interface.eventwrite = addevent( base, interface.conn, EV_WRITE, interface.writecallback, cfg.WRITE_TIMEOUT )
+ end
+ interface.eventreadtimeout = addevent( base, nil, EV_TIMEOUT,
+ function( )
+ interface:_close()
+ end, cfg.READ_TIMEOUT
+ )
+ debug( "wantwrite during read attempt, reg it in writecallback but dont know what really happens next..." )
+ -- to be honest i dont know what happens next, if it is allowed to first read, the write etc...
+ else -- connection was closed or fatal error
+ interface.fatalerror = err
+ debug( "connection failed in read event:", interface.fatalerror )
+ interface:_close()
+ interface.eventread = nil
+ return -1
+ end
+ else
+ interface.onincoming( interface, buffer, err ) -- send new data to listener
+ end
+ if interface.noreading then
+ interface.eventread = nil;
+ return -1;
+ end
+ return EV_READ, cfg.READ_TIMEOUT
+ end
+
+ client:settimeout( 0 ) -- set non blocking
+ setmetatable(interface, interface_mt)
+ interfacelist( "add", interface ) -- add to interfacelist
+ return interface
+ end
+end
+
+local handleserver
+do
+ function handleserver( server, addr, port, pattern, listener, sslctx ) -- creates an server interface
+ debug "creating server interface..."
+ local interface = {
+ _connections = 0;
+
+ conn = server;
+ onconnect = listener.onconnect; -- will be called when new client connected
+ eventread = false; -- read event handler
+ eventclose = false; -- close event handler
+ readcallback = false; -- read event callback
+ fatalerror = false; -- error message
+ nointerface = true; -- lock/unlock parameter
+
+ _ip = addr, _port = port, _pattern = pattern,
+ _sslctx = sslctx;
+ }
+ interface.id = tostring(interface):match("%x+$");
+ interface.readcallback = function( event ) -- server handler, called on incoming connections
+ --vdebug( "server can accept, id/addr/port:", interface, addr, port )
+ if interface.fatalerror then
+ --vdebug( "leaving this event because:", self.fatalerror )
+ interface.eventread = nil
+ return -1
+ end
+ local delay = cfg.ACCEPT_DELAY
+ if EV_TIMEOUT == event then
+ if interface._connections >= cfg.MAX_CONNECTIONS then -- check connection count
+ debug( "to many connections, seconds to wait for next accept:", delay )
+ return EV_TIMEOUT, delay -- timeout...
+ else
+ return EV_READ -- accept again
+ end
+ end
+ --vdebug("max connection check ok, accepting...")
+ local client, err = server:accept() -- try to accept; TODO: check err
+ while client do
+ if interface._connections >= cfg.MAX_CONNECTIONS then
+ client:close( ) -- refuse connection
+ debug( "maximal connections reached, refuse client connection; accept delay:", delay )
+ return EV_TIMEOUT, delay -- delay for next accept attempt
+ end
+ local client_ip, client_port = client:getpeername( )
+ interface._connections = interface._connections + 1 -- increase connection count
+ local clientinterface = handleclient( client, client_ip, client_port, interface, pattern, listener, sslctx )
+ --vdebug( "client id:", clientinterface, "startssl:", startssl )
+ if has_luasec and sslctx then
+ clientinterface:starttls(sslctx, true)
+ else
+ clientinterface:_start_session( true )
+ end
+ debug( "accepted incoming client connection from:", client_ip or "<unknown IP>", client_port or "<unknown port>", "to", port or "<unknown port>");
+
+ client, err = server:accept() -- try to accept again
+ end
+ return EV_READ
+ end
+
+ server:settimeout( 0 )
+ setmetatable(interface, interface_mt)
+ interfacelist( "add", interface )
+ interface:_start_session()
+ return interface
+ end
+end
+
+local addserver = ( function( )
+ return function( addr, port, listener, pattern, sslctx, startssl ) -- TODO: check arguments
+ --vdebug( "creating new tcp server with following parameters:", addr or "nil", port or "nil", sslctx or "nil", startssl or "nil")
+ if sslctx and not has_luasec then
+ debug "fatal error: luasec not found"
+ return nil, "luasec not found"
+ end
+ local server, err = socket.bind( addr, port, cfg.ACCEPT_QUEUE ) -- create server socket
+ if not server then
+ debug( "creating server socket on "..addr.." port "..port.." failed:", err )
+ return nil, err
+ end
+ local interface = handleserver( server, addr, port, pattern, listener, sslctx, startssl ) -- new server handler
+ debug( "new server created with id:", tostring(interface))
+ return interface
+ end
+end )( )
+
+local addclient, wrapclient
+do
+ function wrapclient( client, ip, port, listeners, pattern, sslctx )
+ local interface = handleclient( client, ip, port, nil, pattern, listeners, sslctx )
+ interface:_start_connection(sslctx)
+ return interface, client
+ --function handleclient( client, ip, port, server, pattern, listener, _, sslctx ) -- creates an client interface
+ end
+
+ function addclient( addr, serverport, listener, pattern, sslctx, typ )
+ if sslctx and not has_luasec then
+ debug "need luasec, but not available"
+ return nil, "luasec not found"
+ end
+ if getaddrinfo and not typ then
+ local addrinfo, err = getaddrinfo(addr)
+ if not addrinfo then return nil, err end
+ if addrinfo[1] and addrinfo[1].family == "inet6" then
+ typ = "tcp6"
+ end
+ end
+ local create = socket[typ or "tcp"]
+ if type( create ) ~= "function" then
+ return nil, "invalid socket type"
+ end
+ local client, err = create() -- creating new socket
+ if not client then
+ debug( "cannot create socket:", err )
+ return nil, err
+ end
+ client:settimeout( 0 ) -- set nonblocking
+ local res, err = client:connect( addr, serverport ) -- connect
+ if res or ( err == "timeout" or err == "Operation already in progress" ) then
+ if client.getsockname then
+ addr = client:getsockname( )
+ end
+ local interface = wrapclient( client, addr, serverport, listener, pattern, sslctx )
+ debug( "new connection id:", interface.id )
+ return interface, err
+ else
+ debug( "new connection failed:", err )
+ return nil, err
+ end
+ end
+end
+
+
+local loop = function( ) -- starts the event loop
+ base:loop( )
+ return "quitting";
+end
+
+local newevent = ( function( )
+ local add = base.addevent
+ return function( ... )
+ return add( base, ... )
+ end
+end )( )
+
+local closeallservers = function( arg )
+ for _, item in ipairs( interfacelist( ) ) do
+ if item.type == "server" then
+ item:close( arg )
+ end
+ end
+end
+
+local function setquitting(yes)
+ if yes then
+ -- Quit now
+ closeallservers();
+ base:loopexit();
+ end
+end
+
+local function get_backend()
+ return base:method();
+end
+
+-- We need to hold onto the events to stop them
+-- being garbage-collected
+local signal_events = {}; -- [signal_num] -> event object
+local function hook_signal(signal_num, handler)
+ local function _handler(event)
+ local ret = handler();
+ if ret ~= false then -- Continue handling this signal?
+ return EV_SIGNAL; -- Yes
+ end
+ return -1; -- Close this event
+ end
+ signal_events[signal_num] = base:addevent(signal_num, EV_SIGNAL, _handler);
+ return signal_events[signal_num];
+end
+
+local function link(sender, receiver, buffersize)
+ local sender_locked;
+
+ function receiver:ondrain()
+ if sender_locked then
+ sender:resume();
+ sender_locked = nil;
+ end
+ end
+
+ function sender:onincoming(data)
+ receiver:write(data);
+ if receiver.writebufferlen >= buffersize then
+ sender_locked = true;
+ sender:pause();
+ end
+ end
+ sender:set_mode("*a");
+end
+
+local add_task do
+ local EVENT_LEAVE = (event.core and event.core.LEAVE) or -1;
+ local socket_gettime = socket.gettime
+ function add_task(delay, callback)
+ local event_handle;
+ event_handle = base:addevent(nil, 0, function ()
+ local ret = callback(socket_gettime());
+ if ret then
+ return 0, ret;
+ elseif event_handle then
+ return EVENT_LEAVE;
+ end
+ end
+ , delay);
+ end
+end
+
+return {
+
+ cfg = cfg,
+ base = base,
+ loop = loop,
+ link = link,
+ event = event,
+ event_base = base,
+ addevent = newevent,
+ addserver = addserver,
+ addclient = addclient,
+ wrapclient = wrapclient,
+ setquitting = setquitting,
+ closeall = closeallservers,
+ get_backend = get_backend,
+ hook_signal = hook_signal,
+ add_task = add_task,
+
+ __NAME = SCRIPT_NAME,
+ __DATE = LAST_MODIFIED,
+ __AUTHOR = SCRIPT_AUTHOR,
+ __VERSION = SCRIPT_VERSION,
+
+}