195 lines
7.1 KiB
Python
195 lines
7.1 KiB
Python
from twisted.internet.protocol import DatagramProtocol
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from twisted.internet import reactor
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from time import sleep
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import sys
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def address_to_string(address):
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ip, port = address
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return ':'.join([ip, str(port)])
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class ServerProtocol(DatagramProtocol):
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def __init__(self):
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self.active_sessions: dict[Session] = {}
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self.registered_clients: dict[Client] = {}
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# Checks whether a client with the given client_id is already registered.
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def is_client_registered(self, client_id):
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return client_id in self.registered_clients
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# Checks if a session has already been registered with the given session_id.
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def session_exists(self, session_id) -> bool:
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return session_id in self.active_sessions
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# Creates a new session for players to join.
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def create_session(self, session_id, host_client_id) -> int:
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if self.session_exists(session_id):
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# Tried to create existing session
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return 1
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self.active_sessions[session_id] = Session(session_id, host_client_id, self)
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return 0
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# Closes an existing session. Must disconnect all clients manually before calling this!
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def close_session(self, s_id):
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try:
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del self.active_sessions[s_id]
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except KeyError:
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print("Tried to terminate non-existing session")
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# Registers a client and connects them to a given session.
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def register_client(self, session_id, client_id, client_name, client_ip, client_port) -> int:
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if self.is_client_registered(client_id):
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print("Client %s is already registered." % [client_id])
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return 1
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if not self.session_exists(session_id):
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print("Client registered for non-existing session")
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return 2
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if len(self.active_sessions[session_id].registered_clients) >= 2:
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print("Trying to join full session")
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return 3
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new_client = Client(session_id, client_id, client_name, client_ip, client_port)
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self.registered_clients[client_id] = new_client
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self.active_sessions[session_id].register_client(new_client)
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return 0
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# Disconnects a client and removes them from the registered_clients.
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def disconnect_client(self, session_id, client_id):
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try:
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del self.registered_clients[client_id]
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self.active_sessions[session_id].remove_client(client_id)
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except KeyError:
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print("Tried to disconnect unregistered client %s." % [client_id])
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# Checks whether the given client owns any session. Returns the session ID if true.
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# Returns an empty string otherwise.
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def owns_session(self, client_id) -> str:
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for session_id in self.active_sessions:
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if self.active_sessions[session_id].host_client_id == client_id:
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return session_id
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return ""
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# Sends a message to a client specified by their address.
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def send_message(self, msg, address):
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self.transport.write(bytes(msg, "utf-8"), address)
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# Executed when data is received from a client.
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def datagramReceived(self, datagram, address):
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"""Handle incoming datagram messages."""
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print(datagram)
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data_string = datagram.decode("utf-8")
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msg_type = data_string[:2]
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print(address)
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client_ip, client_port = address
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split_data = data_string.split(":")
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if msg_type == "cr":
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# create lobby
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error = self.create_session(split_data[1], split_data[2])
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if error == 1:
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# tried to create existing session
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print("Could not create session; already exists")
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self.transport.write(bytes('c1', "utf-8"), address)
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return
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# TODO no error handling for register_client here yet
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print(self.register_client(split_data[1], split_data[2], split_data[3], client_ip, client_port))
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print(client_port)
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print("CLIENT PORT")
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print("successfully created session and registered client")
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self.transport.write(bytes('c0', "utf-8"), address)
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elif msg_type == "jn":
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# join lobby
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error = self.register_client(split_data[1], split_data[2], split_data[3], client_ip, client_port)
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print(client_port)
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print("CLIENT PORT")
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if error == 1:
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# client already registered
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self.send_message('j1', address)
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return
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elif error == 2:
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# session does not exist
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self.send_message('j2', address)
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return
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elif error == 3:
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# session full
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self.send_message('j3', address)
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return
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self.send_message('j0', address)
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print("joined successfully")
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elif msg_type == "lv":
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session_id = split_data[1]
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leaving_client_id = split_data[2]
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owned_session = self.owns_session(leaving_client_id)
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if owned_session == "":
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# client is only connected to a session
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self.disconnect_client(session_id, leaving_client_id)
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print("disconnected client from session")
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else:
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# client owns a session
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# disconnect all clients
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clients_to_delete = self.active_sessions[session_id].registered_clients.copy()
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for client in clients_to_delete:
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print(clients_to_delete)
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print(client)
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client_address = (client.client_ip, client.client_port)
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print(client_address)
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self.send_message('ex', client_address)
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self.disconnect_client(client.session_id, client.client_id)
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self.close_session(session_id)
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print("host gone; disconnected clients and closed session")
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class Session:
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def __init__(self, session_id, host_client_id, server):
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self.id = session_id
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self.host_client_id = host_client_id
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self.server = server
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self.registered_clients: list[Client] = []
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# Registers a client in the session.
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def register_client(self, client):
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if client in self.registered_clients:
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# Client is already registered
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return
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self.registered_clients.append(client)
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def remove_client(self, client_id):
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for client in self.registered_clients:
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if client.client_id == client_id:
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self.registered_clients.remove(client)
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class Client:
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def __init__(self, session_id, client_id, client_name, client_ip, client_port):
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self.session_id = session_id
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self.client_id = client_id
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self.client_name = client_name
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self.client_ip = client_ip
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self.client_port = client_port
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if __name__ == '__main__':
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if len(sys.argv) < 2:
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print("Usage: ./server.py PORT")
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sys.exit(1)
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port = int(sys.argv[1])
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reactor.listenUDP(port, ServerProtocol())
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print('Listening on *:%d' % (port))
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reactor.run()
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