Simple chat server using Atlas-Python

What it does

Code

Server class

"send_all" -method sends to all clients that have already logged in requested talk operation as sound perception.

"has_account" -method is used to check whether there already exists client with given id.

class ChatServer(server.SocketServer):
    def send_all(self, op):
        for client in self.clients:
            if hasattr(client, "id"):
                client.send_operation(atlas.Operation("sound",
                                                      op,
                                                      from_ = op.from_,
                                                      to = client.id))
    def has_account(self, id):
        for client in self.clients:
            if hasattr(client, "id") and client.id == id:
                return 1
        return 0

Client class

Talk operations are simply forwarded to server part to be broadcasted to every client. If client is not logged in, then talk operation is discarded.

class ChatClient(server.TcpClient):
    def login_op(self, op):
        account = op.args[0].id
        if self.server.has_account(account):
            self.send_error(op, "somebody already in with that id")
        else:
            self.id = account
            ent = atlas.Object(parents=["player"], id=account)
            self.reply_operation(op, atlas.Operation("info",
                                                     ent,
                                                     to=account))

    create_op = login_op

    def talk_op(self, op):
        if hasattr(self, "id"):
            op.from_ = self.id
            self.server.send_all(op)

Main part

    s = ChatServer("Simple OOG chat server", server.args2address(sys.argv), ChatClient)
    s.loop()

For whole example code see forge/libs/Atlas-Python/chat_server.py

Example telnet sessions

Session1:

ATLAS telnet client
ICAN Bach_beta

{parents:["login"], args:[{id:"al"}], id:"0", objtype:"op"}
{parents:["talk"], args:[{say:"Hello world!"}], from:"al", objtype:"op"}

ATLAS telnet client
ICAN Bach_beta

{parents:["login"], args:[{id:"la"}], id:"0", objtype:"op"}
{parents:["talk"], args:[{say:"!dlrow olleH"}], from:"la", objtype:"op"}