added REPL mode to python client

client.py

@@ -3,6 +3,18 @@ import struct
 import argparse
 
 
+def print_logo():
+    print(r"""
+╔════════════════════════════════════════════════════════════╗
+║             _             _____  ______ _____ _____  _____ ║
+║            | |           |  __ \|  ____|  __ \_   _|/ ____|║
+║ _ __   ___ | |_    __ _  | |__) | |__  | |  | || | | (___  ║
+║| '_ \ / _ \| __|  / _` | |  _  /|  __| | |  | || |  \___ \ ║
+║| | | | (_) | |_  | (_| | | | \ \| |____| |__| || |_ ____) |║
+║|_| |_|\___/ \__|  \__,_| |_|  \_\______|_____/_____|_____/ ║
+╚════════════════════════════════════════════════════════════╝
+""")
+
 def recv_exact(sock: socket.socket, n: int) -> bytes:
     data = b''
     while len(data) < n:
@@ -24,23 +36,50 @@ def recv_frame(sock: socket.socket) -> bytes:
     return recv_exact(sock, length)
 
 def main():
+    print_logo()
     parser = argparse.ArgumentParser(description='NOT(Redis) client')
     parser.add_argument('-H', '--host', type=str, required=False, default='127.0.0.1', help='Server host')
     parser.add_argument('-P', '--port', type=int, required=False, default=6379, help='Server port')
-    parser.add_argument('-M', '--message', type=str, required=False, default='hello', help='Message to send')
+    parser.add_argument('-M', '--message', type=str, required=False, default=None, help='Message to send (if not provided, starts interactive shell)')
     args = parser.parse_args()
 
     try:
         with socket.create_connection((args.host, args.port)) as sock:
-            send_frame(sock, args.message.encode())
+            if args.message:
-            response = recv_frame(sock)
+                send_frame(sock, args.message.encode())
-            print('Message sent:', args.message)
+                response = recv_frame(sock)
-            print('Server says:', response.decode("utf-8", errors='replace'))
+                print('Message sent:', args.message)
+                print('Server says:', response.decode("utf-8", errors='replace'))
+            else:
+                print(f"Connected to {args.host}:{args.port}")
+                print("Type 'quit' or 'exit' to leave.")
+                import readline
+
+                while True:
+                    try:
+                        prompt = f"{args.host}:{args.port}> "
+                        cmd_line = input(prompt).strip()
+                        
+                        if not cmd_line:
+                            continue
+                            
+                        if cmd_line.lower() in ('quit', 'exit'):
+                            break
+                        
+                        send_frame(sock, cmd_line.encode())
+                        response = recv_frame(sock)
+                        print(response.decode("utf-8", errors='replace'))
+                        
+                    except KeyboardInterrupt:
+                        print("\nType 'quit' or 'exit' to leave.")
+                    except EOFError:
+                        break
+
     except ConnectionRefusedError as e:
         print('Connection refused by server:', e)
         exit(1)
     except ConnectionError as e:
-        print('Failed to connect to server:', e)
+        print('Connection error:', e)
         exit(1)
     except Exception as e:
         print('Unexpected error:', e)