51 lines
1.7 KiB
Python
51 lines
1.7 KiB
Python
import socket
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import struct
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import argparse
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def recv_exact(sock: socket.socket, n: int) -> bytes:
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data = b''
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while len(data) < n:
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chunk = sock.recv(n - len(data))
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if len(chunk) == 0:
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raise ConnectionError('EOF from server')
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data += chunk
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return data
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def send_frame(sock: socket.socket, payload: bytes) -> None:
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header = struct.pack('!I', len(payload))
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sock.sendall(header + payload)
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def recv_frame(sock: socket.socket) -> bytes:
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header = recv_exact(sock, 4)
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(length,) = struct.unpack('!I', header)
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if length > 10_000_000:
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raise ValueError('Message length is too long')
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return recv_exact(sock, length)
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def main():
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parser = argparse.ArgumentParser(description='NOT(Redis) client')
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parser.add_argument('-H', '--host', type=str, required=False, default='127.0.0.1', help='Server host')
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parser.add_argument('-P', '--port', type=int, required=False, default=6379, help='Server port')
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parser.add_argument('-M', '--message', type=str, required=False, default='hello', help='Message to send')
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args = parser.parse_args()
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try:
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with socket.create_connection((args.host, args.port)) as sock:
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send_frame(sock, args.message.encode())
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response = recv_frame(sock)
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print('Message sent:', args.message)
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print('Server says:', response.decode("utf-8", errors='replace'))
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except ConnectionRefusedError as e:
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print('Connection refused by server:', e)
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exit(1)
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except ConnectionError as e:
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print('Failed to connect to server:', e)
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exit(1)
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except Exception as e:
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print('Unexpected error:', e)
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exit(1)
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if __name__ == '__main__':
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main()
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