使用python实现基于 Go-Back-N 的可靠数据传输软件并设计验证,包括发送客户端和接收客户端
时间: 2023-06-24 22:05:43 浏览: 85
Go-Back-N协议是一种流水线协议,它允许发送方在不等待确认的情况下发送多个数据包。这种协议主要用于在不可靠的网络环境中实现可靠数据传输。下面是一个基于Go-Back-N的可靠数据传输软件的python实现。
发送客户端:
```python
import socket
# 配置发送方参数
UDP_IP = "127.0.0.1"
UDP_PORT = 5005
MESSAGE = "Hello, World!"
# 设置序列号
sequence_number = 0
# 创建套接字
sock = socket.socket(socket.AF_INET, # Internet
socket.SOCK_DGRAM) # UDP
# 发送数据
while True:
# 发送数据包
sock.sendto(str(sequence_number) + MESSAGE, (UDP_IP, UDP_PORT))
# 等待ACK
try:
sock.settimeout(1.0)
data, addr = sock.recvfrom(1024)
if data == str(sequence_number):
print("Received ACK for packet", sequence_number)
sequence_number += 1
except socket.timeout:
print("Timeout. Resending packet", sequence_number)
```
接收客户端:
```python
import socket
# 配置接收方参数
UDP_IP = "127.0.0.1"
UDP_PORT = 5005
# 设置期望的序列号
expected_sequence_number = 0
# 创建套接字
sock = socket.socket(socket.AF_INET, # Internet
socket.SOCK_DGRAM) # UDP
# 绑定套接字
sock.bind((UDP_IP, UDP_PORT))
# 接收数据
while True:
data, addr = sock.recvfrom(1024) # 缓冲区大小为1024字节
packet_sequence_number = int(data[:1])
if packet_sequence_number == expected_sequence_number:
print("Received packet", packet_sequence_number)
# 发送ACK
sock.sendto(str(packet_sequence_number), addr)
expected_sequence_number += 1
else:
print("Discarding out-of-order packet", packet_sequence_number)
```
需要注意的是,在实际应用中,需要添加一些额外的机制来处理超时、丢包和重复包等情况,以保证数据传输的可靠性。