GenServ

genserv

• https://merlin.leenox.de/genserv
• git clone gitosis@zwischenwelt.org:genserv.git (currently only private git)

udpserv

• genserv itself is currently tcp based and multithreading enabled (heavy c++ boost use)
• udpserv is a variant/spinoff using a similar protocol but for udp, implementing "reliable" udp with resend-interval until acknowledge is received
• similar to irc with "chatrooms" that can be joined and broadcast messages to all within, but more for realtime / game network data communication

typedef enum {
	kMsgType_Undefined = 0,
	kMsgType_NormalUDP = 10,
	kMsgType_ReliableUDP,
	kMsgType_Ack,
	kMsgType_JoinRoom,
	kMsgType_LeaveRoom,
	kMsgType_Hello,
	kMsgType_Welcome,
	kMsgType_Quit,
	kMsgType_Ping,
} eMsgType;

[uint8:kMsgType_NormalUDP  ][uint32:to]...data...  // c->s s->c
[uint8:kMsgType_ReliableUDP][uint32:ackid][uint32:to][uint32:interval]...data...  // c->s s->c will be resent until acknowledged, might arrive multiple times
[uint8:kMsgType_Ack        ][uint32:ackid]...data...  // c->s s->c data optional, e.g. roomid for join
[uint8:kMsgType_JoinRoom   ][uint32:ackid][str:roomname]  // c->s ack with data=roomid
[uint8:kMsgType_LeaveRoom  ][uint32:ackid][uint32:roomid]  // c->s
[uint8:kMsgType_Hello      ]  // c->s client sends this, answered by kMsgType_Welcome 
[uint8:kMsgType_Welcome    ][uint32:ownid]  // s->c server sends this as reply to kMsgType_Welcome
[uint8:kMsgType_Quit       ]  // c->s client sends this before termination, for faster timeout ?
[uint8:kMsgType_Ping       ]  // s->c c->s client replies with kMsgType_Ping

comparison with irc

• similarities :
  • channels
  • pms

• differences
  • minimized delay : made realtime game data communication
  • channel meta / mailboxes : larger messages (avatar pictures, maps) can be stored in server-side database and requested by id

reliable udp

<ghoulsblade> für ne reine udp brauchen wir noch confirm nachrichten
<ghoulsblade> und config für resend-interval und timeout
<ghoulsblade> evtl regelmässige roundtrip-time messung für dynamischen resend interval, damits so schnell wie möglich resendet wird bei störung aber nicht immer doppelt geschickt wird wenns keine störung gibt
<ghoulsblade> vll sogar 2 typen von reliable
<ghoulsblade> fast auf kosten von bandbreite und slow mit mehr längerem interval

notes

• website doc : optimized for game-jammers : api provided by lib first, technical internas later, not interesting, e.g. id resolve capsuled ?
• udp : ordering-group id ? ordered but unreliable, option to automatically get latest successfully transmitted in group.

<ghoulsblade> z.b. wenn client jedes frame die eigene position broadcastet,  api packt automatisch ne nummer dazu
<ghoulsblade> ne aufsteigende nummer, mit jedem broadcats um 1 erhöht
<ghoulsblade> und man kann dann auf empfängerseite immer das letzte abrufen. wenn eins verspätet ankommt und man schon ne neuere nummer hat, wirds verworfen