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- import argparse
- import math
- import os
- import socket
-
- MSS = 20476 # MSS = Server buffer size (20480) - data header size (4)
-
-
- def await_ack(packet):
- s.settimeout(1)
- while True:
- try:
- data, addr = s.recvfrom(1024)
- print(f"Server: {data.decode()}")
- received_ack_seqno = int(data[2:3].decode())
- expected_ack_seqno = (int(packet[2:3].decode()) + 1) % 2
- if received_ack_seqno != expected_ack_seqno:
- continue
- return True
- except KeyboardInterrupt:
- print("Client: Exiting...")
- exit()
- except socket.timeout: # Expected ACK was not received within one second
- print(f"Client: Retransmitting...")
- s.sendto(packet, (server_ip, server_port))
-
-
- if __name__ == "__main__":
- parser = argparse.ArgumentParser()
- parser.add_argument("server_addr", type=str)
- parser.add_argument("file_path", type=str)
- args = parser.parse_args()
-
- server_ip, server_port = args.server_addr.split(":")
- server_port = int(server_port)
- file_name = args.file_path.split(os.path.sep)[-1]
- file_size = os.path.getsize(args.file_path)
-
- with socket.socket(family=socket.AF_INET, type=socket.SOCK_DGRAM) as s:
- s.setsockopt(socket.SOL_SOCKET, socket.SO_SNDBUF, 30000)
-
- # Check file existence
- if not os.path.exists(args.file_path):
- print(f"Client: no such file: {args.file_path}")
- exit()
-
- # Send start packet to server
- packet = f"s|0|{file_name}|{file_size}".encode()
- print(f"Client: {packet.decode()}")
- s.sendto(packet, (server_ip, server_port))
-
- # Wait for ACK for the given packet
- await_ack(packet)
-
- # Upload file to server
- seqno = 1
- with open(args.file_path, "rb") as f:
- for i in range(math.ceil(file_size / MSS)):
- print(f"Client: d|{seqno}|chunk{i + 1}")
- packet = bytes(f"d|{seqno}|", "utf-8") + f.read(MSS)
- s.sendto(packet, (server_ip, server_port))
- await_ack(packet)
- seqno = (seqno + 1) % 2
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