#udp server

[willraman-blog]

A game update

A couple nights ago I got the UDP server working. I took the code from another project I worked on (encrypted UDP client/server), broke apart all the modules that made up legacy of a warlord, finally took the code from the tile memory manager project and squished them all together into 2 parts server/client.

The server currently handles:

Client session management

Packet encryption between client/server

Processing client event requests (after determining if it is valid) 

Multiple threads: client session manager and network thread (non-blocking UDP)

The client handles:

Display of tiles

User input

Sending event requests to the server (very simple commands like, <request move left>)

Processing packets based on server encryption key.

Moving forward now by adding in more modules from legacy of a warlord for the server. Next is the XML files for entities (mobs.xml). I decided I will split this file in half. Tiles/Ascii displayed will be controlled by the client. All the AI/attributes will be stored in the server.

I hope to have a release of the client up by Christmas and a server running somewhere on the internet. I think this time I will also try to have a linux release of the client. I really respect that community and like that OS.

[willraman-blog]

UDP client / server

 Learned very quickly that UDP is fire and forget... and it might not even make it there.

I just dove into coding as I wanted to get a crash course in UDP programming. I set up an overall hierarchy to communication between these modules. Jumbled mess of code right now although I'm learning and having fun programming.

Here is my early design implementation (half baked idea).

Threadable UDP Packet handler class

This class is the communication layer to the internet.

Handles decryption/encryption (using my own homebrewed cipher function).

Handles sending/receiving on the UDP socket.

Wraps/Unwraps UDP packet format (raw bytes) into a uMSG.

Interacts with: Session manager (for decrypt/encrypt info, hash info, and report errors on user) Messenger (to grab messages from the outgoing queue or place them into the incoming queue)

Session manager class

This class is a storage class.

Holds all the pertinent data about a user's session (IP Address, current encryption key, active time, time of last key update, errors, malformed packets, etc).

Session security (what user is on each port and encryption state)

Kick/bans.

Spawns new Packet handler and split sessions to new port.

Messenger class

Stores the packets that were received in a message wrapper on the appropriate queue.

Handles message timeout.

Queue message for resend.

Track acknowledge state of a message.

Executes the Action of the message (causing game engine to do something).

OpenOffice draw, FTW