diff options
| -rw-r--r-- | net/server_event.lua | 759 |
1 files changed, 759 insertions, 0 deletions
diff --git a/net/server_event.lua b/net/server_event.lua new file mode 100644 index 00000000..15d1dea0 --- /dev/null +++ b/net/server_event.lua @@ -0,0 +1,759 @@ +--[[
+
+
+ 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
+ -- never call eventcallback:close( ) from inside eventcallback
+ -- 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_ATTEMPS = 10, -- attemps to finish ssl handshake
+ HANDSHAKE_TIMEOUT = 1, -- timout in seconds per handshake attemp
+ 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_DELAY = 10, -- seconds to wait until the next attemp of a full server to accept
+ READ_TIMEOUT = 60 * 30, -- timeout in seconds for read data from socket
+ WRITE_TIMEOUT = 30, -- timeout in seconds for write data on socket
+ CONNECT_TIMEOUT = 10, -- timeout in seconds for connection attemps
+ 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 print = use "print"
+local pcall = use "pcall"
+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 ssl = use "ssl"
+local socket = use "socket"
+
+local log = require ("util.logger").init("socket")
+
+local function debug(...)
+ return log("debug", ("%s "):rep(select('#', ...)), ...)
+end
+
+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 getid = function( )
+ return function( )
+ 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_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
+ local string_len = string.len
+
+ -- Private methods
+ function interface_mt:_position(new_position)
+ self.position = new_position or self.position
+ return self.position;
+ end
+ function interface_mt:_close() -- regs event to start self:_destroy()
+ local callback = function( )
+ self:_destroy();
+ self.eventclose = nil
+ return -1
+ end
+ self.eventclose = addevent( base, nil, EV_TIMEOUT, callback, 0 )
+ return true
+ end
+
+ function interface_mt:_start_connection(plainssl) -- should be called from addclient
+ local callback = function( event )
+ if EV_TIMEOUT == event then -- timout during connection
+ self.fatalerror = "connection timeout"
+ self.listener.ontimeout( self ) -- call timeout listener
+ self:_close()
+ debug( "new connection failed. id:", self, "error:", self.fatalerror )
+ else
+ if plainssl then -- start ssl session
+ self:_start_ssl( self.listener.onconnect )
+ else -- normal connection
+ self:_start_session( self.listener.onconnect )
+ end
+ debug( "new connection established. id:", self )
+ 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(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 )
+ self.eventread = addevent( base, self.conn, EV_READ, self.readcallback, cfg.READ_TIMEOUT ) -- register callback
+ onconnect( self )
+ 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 )
+ self.eventread = addevent( base, self.conn, EV_READ, self.readcallback ) -- register callback
+ end
+ return true
+ end
+ function interface_mt:_start_ssl(arg) -- old socket will be destroyed, therefore we have to close read/write events first
+ --vdebug( "starting ssl session with client id:", self )
+ 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 "onconnect" == arg 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_ATTEMPS
+ while attempt < 1000 do -- no endless loop
+ attempt = attempt + 1
+ debug( "ssl handshake of client with id:", self, "attemp:", attempt )
+ if attempt > maxattempt then
+ self.fatalerror = "max handshake attemps 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
+ local onsomething
+ if "onconnect" == arg then -- trigger listener
+ onsomething = self.listener.onconnect
+ else
+ onsomething = self.listener.onsslconnection
+ end
+ self:_start_session( onsomething )
+ debug( "ssl handshake done" )
+ self.eventhandshake = nil
+ return -1
+ end
+ debug( "error during ssl handshake:", err )
+ if err == "wantwrite" then
+ event = EV_WRITE
+ elseif err == "wantread" then
+ event = EV_READ
+ else
+ self.fatalerror = err
+ end
+ end
+ if self.fatalerror then
+ if "onconnect" == arg 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 )
+ self:_lock( true, true, true ) -- first of all, lock the interface to avoid further actions
+ local _
+ _ = self.eventread and self.eventread:close( ) -- close events; this must be called outside of the event callbacks!
+ 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 ) -- call ondisconnect listener (wont be the case if handshake failed on connect)
+ _ = self.conn and self.conn:close( ) -- close connection, must also be called outside of any socket registered events!
+ 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
+
+ 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)
+ --vdebug( "try to send data to client, id/data:", self, data )
+ data = tostring( data )
+ local len = string_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
+ self.writebuffer = 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(now)
+ debug( "try to close client connection with id:", self )
+ if self.type == "client" then
+ self.fatalerror = "client to close"
+ if ( not self.eventwrite ) or now then -- try to close immediately
+ self:_lock( true, true, true )
+ self:_close()
+ return true
+ else -- wait for incomplete write request
+ self:_lock( true, true, false )
+ debug "closing delayed until writebuffer is empty"
+ return nil, "writebuffer not empty, waiting"
+ end
+ else
+ debug( "try to close server with id:", self, "args:", now )
+ self.fatalerror = "server to close"
+ self:_lock( true )
+ local count = 0
+ for _, item in ipairs( interfacelist( ) ) do
+ if ( item.type ~= "server" ) and ( item._server == self ) then -- client/server match
+ if item:close( now ) then -- writebuffer was empty
+ count = count + 1
+ end
+ end
+ end
+ local timeout = 0 -- dont wait for unfinished writebuffers of clients...
+ if not now then
+ timeout = cfg.WRITE_TIMEOUT -- ...or wait for it
+ end
+ self:_close( timeout ) -- add new event to remove the server interface
+ debug( "seconds remained until server is closed:", timeout )
+ return count -- returns finished clients with empty writebuffer
+ end
+ end
+
+ function interface_mt:server()
+ return self._server or self;
+ end
+
+ function interface_mt:port()
+ return self._port
+ end
+
+ function interface_mt:ip()
+ return self._ip
+ end
+
+ function interface_mt:ssl()
+ return self.usingssl
+ end
+
+ 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:starttls()
+ debug( "try to start ssl at client id:", self )
+ local err
+ if not self.sslctx then -- no ssl available
+ err = "no ssl context available"
+ elseif 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:_start_ssl();
+ 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
+ return true
+ end
+
+ function interface_mt.onconnect()
+ end
+end
+
+-- End of client interface methods
+
+local handleclient;
+do
+ local string_sub = string.sub -- caching table lookups
+ local string_len = string.len
+ local addevent = base.addevent
+ local coroutine_wrap = coroutine.wrap
+ local socket_gettime = socket.gettime
+ local coroutine_yield = coroutine.yield
+ 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
+ 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,
+ _sslctx = sslctx; -- parameters
+ _usingssl = false; -- client is using ssl;
+ }
+ 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
+ local succ, err, byte = interface.send( interface.conn, interface.writebuffer, 1, interface.writebufferlen )
+ --vdebug( "write data:", interface.writebuffer, "error:", err, "part:", byte )
+ if succ then -- writing succesful
+ interface.writebuffer = ""
+ interface.writebufferlen = 0
+ 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 then -- want write again
+ --vdebug( "writebuffer is not empty:", err )
+ interface.writebuffer = string_sub( interface.writebuffer, 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 evreturn, evtimeout
+ end
+ interface.eventwritetimeout = addevent( base, nil, EV_TIMEOUT, callback, cfg.WRITE_TIMEOUT ) -- reg a new timeout event
+ debug( "wantread during write attemp, 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
+ local usingssl, receive = interface._usingssl, interface.receive;
+ interface.readcallback = function( event ) -- called on read events
+ --vdebug( "new client read event, id/ip/port:", interface, ip, port )
+ if interface.noreading or interface.fatalerror then -- leave this event
+ --vdebug( "leaving this event because:", interface.noreading or interface.fatalerror )
+ interface.eventread = nil
+ return -1
+ end
+ if EV_TIMEOUT == event then -- took too long to get some data from client -> disconnect
+ interface.fatalerror = "timeout during receiving"
+ debug( "connection failed:", interface.fatalerror )
+ interface:_close()
+ interface.eventread = nil
+ return -1
+ else -- can read
+ if 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:", ret )
+ end
+ if interface.eventreadtimeout then
+ interface.eventreadtimeout:close( )
+ interface.eventreadtimeout = nil
+ end
+ end
+ local buffer, err, part = receive( client, pattern ) -- receive buffer with "pattern"
+ --vdebug( "read data:", buffer, "error:", err, "part:", part )
+ buffer = buffer or part or ""
+ local len = string_len( buffer )
+ if len > 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 ( "timeout" ~= err ) 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 attemp, 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
+ end
+ interface.onincoming( interface, buffer, err ) -- send new data to listener
+ return EV_READ, cfg.READ_TIMEOUT
+ end
+ 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, startssl ) -- 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
+ }
+ 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 attemp
+ end
+ local ip, port = client:getpeername( )
+ interface._connections = interface._connections + 1 -- increase connection count
+ local clientinterface = handleclient( client, ip, port, interface, pattern, listener, nil, sslctx )
+ --vdebug( "client id:", clientinterface, "startssl:", startssl )
+ if startssl then
+ clientinterface:_start_ssl( clientinterface.onconnect )
+ else
+ clientinterface:_start_session( clientinterface.onconnect )
+ end
+ debug( "accepted incoming client connection from:", ip, 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, backlog, sslcfg, startssl ) -- TODO: check arguments
+ debug( "creating new tcp server with following parameters:", addr or "nil", port or "nil", sslcfg or "nil", startssl or "nil")
+ local server, err = socket.bind( addr, port, backlog ) -- create server socket
+ if not server then
+ debug( "creating server socket failed because:", err )
+ return nil, err
+ end
+ local sslctx
+ if sslcfg then
+ if not ssl then
+ debug "fatal error: luasec not found"
+ return nil, "luasec not found"
+ end
+ sslctx, err = ssl.newcontext( sslcfg )
+ if err then
+ debug( "error while creating new ssl context for server socket:", err )
+ return nil, err
+ end
+ 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 wrapclient = ( function( )
+ return function( client, addr, serverport, listener, pattern, localaddr, localport, sslcfg, startssl )
+ debug( "try to connect to:", addr, serverport, "with parameters:", pattern, localaddr, localport, sslcfg, startssl )
+ local sslctx
+ if sslcfg then -- handle ssl/new context
+ if not ssl then
+ debug "need luasec, but not available"
+ return nil, "luasec not found"
+ end
+ sslctx, err = ssl.newcontext( sslcfg )
+ if err then
+ debug( "cannot create new ssl context:", err )
+ return nil, err
+ end
+ end
+ end
+end )( )
+
+local addclient = ( function( )
+ return function( addr, serverport, listener, pattern, localaddr, localport, sslcfg, startssl )
+ local client, err = socket.tcp() -- creating new socket
+ if not client then
+ debug( "cannot create socket:", err )
+ return nil, err
+ end
+ client:settimeout( 0 ) -- set nonblocking
+ if localaddr then
+ local res, err = client:bind( localaddr, localport, -1 )
+ if not res then
+ debug( "cannot bind client:", err )
+ return nil, err
+ end
+ end
+ local res, err = client:connect( addr, serverport ) -- connect
+ if res or ( err == "timeout" ) then
+ local ip, port = client:getsockname( )
+ local server = function( )
+ return nil, "this is a dummy server interface"
+ end
+ local interface = handleclient( client, ip, port, server, pattern, listener, sslctx )
+ interface:_start_connection( startssl )
+ debug( "new connection id:", interface )
+ return interface, err
+ else
+ debug( "new connection failed:", err )
+ return nil, err
+ end
+ return wrapclient( client, addr, serverport, listener, pattern, localaddr, localport, sslcfg, startssl )
+ end
+end )( )
+
+local loop = function( ) -- starts the event loop
+ return base:loop( )
+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
+
+return {
+
+ cfg = cfg,
+ base = base,
+ loop = loop,
+ event = event,
+ addevent = newevent,
+ addserver = addserver,
+ addclient = addclient,
+ wrapclient = wrapclient,
+ closeallservers = closeallservers,
+
+ __NAME = SCRIPT_NAME,
+ __DATE = LAST_MODIFIED,
+ __AUTHOR = SCRIPT_AUTHOR,
+ __VERSION = SCRIPT_VERSION,
+
+}
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