Add magic check

server.py

@@ -4,19 +4,32 @@ import logging
 
 LOGGER = logging.getLogger("server")
 
+MAGIC = "e8437140-4347-48cc-a31d-dcdc944ffc16"
+
 def main():
 	logging.basicConfig(level=logging.DEBUG)
 	asyncio.run(run())
 
 async def on_connect(reader, writer):
 	LOGGER.info("connected")
-	data = await reader.read()
-	print(data.decode("UTF-8"))
+	data = await reader.read(36)
+	magic = data.decode("UTF-8")
+	LOGGER.debug("Received magic '%s'", magic)
+	if magic != MAGIC:
+		writer.write("ERR1: Magic not recognized".encode("UTF-8"))
+		writer.close()
+		LOGGER.info("Bad magic, closing connection.")
+		return
+	LOGGER.debug("Magic looks good.")
+	
 
 async def run():
 	server = await asyncio.start_server(on_connect, host="localhost", port=9988)
 	async with server:
+		try:
 			await server.serve_forever()
+		except KeyboardInterrupt:
+			LOGGER.info("Exiting at user request.")
 
 if __name__ == "__main__":
 	main()