Python 中的 UDP 客户端/服务器套接字 [英] UDP Client/Server Socket in Python
问题描述
我是 Python 和套接字的新手,正在尝试编写一个回显客户端/服务器套接字.我已经编写了服务器,以便丢失 30% 的数据包.由于数据包可能丢失,我将我的客户端编程为一秒后超时.但是,每当我运行我的客户端套接字时,我的输出都是 100% REQUEST TIMED OUT.我假设我得到这个输出是因为我的服务器从未收到消息.我已经多次查看我的代码,但无法弄清楚为什么我不断得到这个输出.下面是我的服务器和客户端套接字的代码.任何帮助,将不胜感激.
I'm new to python and sockets and am trying to write an echoing client/server socket. I have written the server so that 30% of the packets are lost. I programmed my client to timeout after one second since the packet could be lost. However, whenever I run my client socket, my output is 100% REQUEST TIMED OUT. I'm assuming I'm getting this output because my server is never receiving the message. I've looked over my code multiple times and cannot figure out why I am constantly getting this output. Below is my code for my server and client sockets. Any help would be appreciated.
服务器套接字:
# We will need the following module to generate randomized lost packets
import random
from socket import *
# Create a UDP socket
# Notice the use of SOCK_DGRAM for UDP packets
serverSocket = socket(AF_INET, SOCK_DGRAM)
# Assign IP address and port number to socket
serverSocket.bind(('', 12000))
while True:
# Generate random number in the range of 0 to 10
rand = random.randint(0, 10)
# Receive the client packet along with the address it is coming from
message, address = serverSocket.recvfrom(1024)
# Capitalize the message from the client
message = message.upper()
# If rand is less is than 4, we consider the packet lost and do notrespond
if rand < 4:
continue
# Otherwise, the server responds
serverSocket.sendto(message, address)
客户端套接字:
import time
from socket import *
pings = 1
#Send ping 10 times
while pings < 11:
#Create a UDP socket
clientSocket = socket(AF_INET, SOCK_DGRAM)
#Set a timeout value of 1 second
clientSocket.settimeout(1)
#Ping to server
message = 'test'
addr = ("127.0.0.1", 12000)
#Send ping
start = time.time()
clientSocket.sendto(message, addr)
#If data is received back from server, print
try:
data, server = clientSocket.recvfrom(1024)
end = time.time()
elapsed = end - start
print data + " " + pings + " "+ elapsed
#If data is not received back from server, print it has timed out
except timeout:
print 'REQUEST TIMED OUT'
pings = pings - 1
推荐答案
我测试了你的代码,它在我的机器上按预期工作.您的问题可能不是您的代码.它可能是防火墙或其他阻止环回接口 (127.0.0.1) 上所有数据包的东西.根据您的操作系统,尝试使用 Wireshark 等数据包监视器进行测试.
I tested your code, and it works as expected on my machine. Your issue might not be your code. It could be a firewall or something else blocking all the packets on the loopback interface (127.0.0.1). Depending on your operating system, try testing with a packet monitor like Wireshark.
此外,这里有一些关于如何改进您的代码以使其更加 Pythonic 的建议:
Also, here are a few suggestions on how to improve your code to be more Pythonic:
服务器
import random
import socket
server_socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
server_socket.bind(('', 12000))
while True:
rand = random.randint(0, 10)
message, address = server_socket.recvfrom(1024)
message = message.upper()
if rand >= 4:
server_socket.sendto(message, address)
客户
import time
import socket
for pings in range(10):
client_socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
client_socket.settimeout(1.0)
message = b'test'
addr = ("127.0.0.1", 12000)
start = time.time()
client_socket.sendto(message, addr)
try:
data, server = client_socket.recvfrom(1024)
end = time.time()
elapsed = end - start
print(f'{data} {pings} {elapsed}')
except socket.timeout:
print('REQUEST TIMED OUT')
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