Yet Another Generic Game Server.
I had a relatively generic game server I wrote, but then I realized I wanted an even simpler, more generic one that could easily be talked to from C/C++, or other languages that are crummy at string processing. Here's my even simpler one.
Open a TCP socket to the server on port 50321. Initiailly, you are in no channels. There are five commands you can send:
E <channel>: Enters a given channel.L <channel>: Leaves a given channel.M <channel> <message>: Sends a given message to a given channel.S <key> <value>: Stores a key/value pair.G <key>: Retrieves a key/value pair.
Each time a string has to be encoded over the wire, it is sent as an 8-byte little endian length field, followed by the actual string.
Thus, to join the channel "foobar" one would send "E\x06\0\0\0\0\0\0\0foobar" to the server.
To send a message to this channel one could send "M\x06\0\0\0\0\0\0\0foobar\x02\0\0\0\0\0\0\0hi" to the server.
The server would then send the very same string (namely "M\x06\0\0\0\0\0\0\0foobar\x02\0\0\0\0\0\0\0hi") to each client in the given channel.
When replying to the G command the server will either send back "S" followed by the key and value (that is to say, exactly the same data as was used to set the key), or send back "E" followed by an error string.
To quit, simply close your end of the socket.