如何在python中套接字超时未收到任何数据后执行代码

Question

我正在使用TCP套接字发送和接收数据。我的逻辑是，如果我的服务器接收到数据(例如0值(，那么一切都会好起来。但是，如果在我为套接字关闭设置了10秒的超时后，我的服务器没有接收到任何数据，那么我希望我的值为默认值1。我正在尝试的服务器代码如下：

import socket
TCP_IP = "0.0.0.0"
TCP_PORT = 5004
BUFFER_SIZE = 20  # Normally 1024, but we want fast response
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.settimeout(10)
s.bind((TCP_IP, TCP_PORT))
s.listen(1)
conn, addr = s.accept()
while 1:
data = conn.recv(BUFFER_SIZE)
if not data:
break
datalist = list(data)
print("payload: %s" % datalist)
conn.send(data)  # echo
else:
datalist = 1
print("default value: %s" % datalist)

但10秒后，我出现超时错误，无法将默认数据列表值设置为1。请告知。其目的是，如果它没有接收到任何数据，那么它将把值设置为1

错误：

Traceback (most recent call last):
File "/home/code.py", line 15, in <module>
conn, addr = s.accept()
File "/usr/lib/python3.8/socket.py", line 292, in accept
fd, addr = self._accept()
socket.timeout: timed out

Answer 1

我认为您想为客户端设置超时，所以如果它在10秒内发送消息，它应该保持连接，否则将断开连接。情况就是这样：

这是server.py代码：

import socket
TCP_IP = "127.0.0.1"
TCP_PORT = 5004
BUFFER_SIZE = 20  # Normally 1024, but we want fast response
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.bind((TCP_IP, TCP_PORT))
s.listen(1)
conn, addr = s.accept()
conn.settimeout(10)
data = conn.recv(BUFFER_SIZE)
if data:
conn.settimeout(None)
conn.send(b"welcome")
print("client is active")
try:
while True:
data = conn.recv(BUFFER_SIZE)       
if data:
print("here is the message:",data)
else:
conn.close()
break
except Exception as e:
print("error is",e)
else:
print("client is inactive")

这是您的client.py代码：

import socket
TCP_IP = "127.0.0.1"
TCP_PORT = 5004
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((TCP_IP, TCP_PORT))
x = input("write anything if you want to connect >")
s.send(bytes(x,'utf-8'))
data = s.recv(1024)
print(data)
try:
while True:
x = input("write your message >")
s.send(bytes(x,'utf-8'))
except Exception as e:
print("error is",e)

Answer 2

如果您为套接字设置超时，那么您必须处理超时异常，在这种情况下，10秒后应该发生的事情超过

while 1:
try:
data = conn.recv(BUFFER_SIZE)
if data:
#data recieved
datalist = list(data)
print("payload: %s" % datalist)
conn.send(data)  # echo
break
except socket.timeout:
#10 seconds finished
datalist = 1
print("default value: %s" % datalist)
break