GameMaker: Studio 1.4 socket protocol

gmserver.py

import socketserver
import struct

class GameMakerTCPHandler(socketserver.StreamRequestHandler):
    def handle(self):
        print("{} trying to connect".format(self.client_address[0]))
        self.wfile.write(b"GM:Studio-Connect\0")
        r = struct.unpack('IIII', self.rfile.read(16))
        if r[0] != 0xcafebabe or r[1] != 0xdeadb00b or r[2] != 16:
            raise Exception("Not a GameMaker client")
        self.wfile.write(struct.pack('III', 0xdeafbead, 0xf00dbeeb, 12))
        print("{} connected ({})".format(self.client_address[0], r[3]))
        
        self.handle_gamemaker()
        
        print("{} disconnected".format(self.client_address[0]))
    
    def handle_gamemaker(self):
        raise NotImplementedError("Override this method in your own class")
    
    def send_packet(self, data):
        self.wfile.write(struct.pack('III', 0xdeadc0de, 12, len(data)) + data)
    
    def recv_packet(self):
        hdrdata = self.rfile.read(12)
        if not hdrdata:
            return None
        header = struct.unpack('III', hdrdata)
        if header[0] != 0xdeadc0de or header[1] != 12:
            raise Exception("Invalid packet")
        return self.rfile.read(header[2])

class MyGameMakerServer(GameMakerTCPHandler):
    def handle_gamemaker(self):
        while True:
            data = self.recv_packet()
            if not data:
                break
            print("{} wrote: {}".format(self.client_address[0], data))
            self.send_packet(data)

class ThreadedTCPServer(socketserver.ThreadingMixIn, socketserver.TCPServer):
    pass

if __name__ == "__main__":
    print("Server starting")
    server = ThreadedTCPServer(("127.0.0.1", 6510), MyGameMakerServer)
    server.serve_forever()