Python 如何在服务器套接字等待连接时关闭它?
我有一个服务器程序,可以维护与多个客户端的连接。我希望能够关闭主服务器套接字(适用于所有人),以响应close by close by client消息,或者出于其他原因。问题是,服务器卡在accept()方法上,不关心是否在其他位置关闭套接字 我可以在主服务器中使用一些标志,然后在这段时间后关闭套接字,但是这意味着我必须在客户端请求后自己连接到服务器,以便检查while条件,这听起来像是非常糟糕的编程 守则:Python 如何在服务器套接字等待连接时关闭它?,python,sockets,Python,Sockets,我有一个服务器程序,可以维护与多个客户端的连接。我希望能够关闭主服务器套接字(适用于所有人),以响应close by close by client消息,或者出于其他原因。问题是,服务器卡在accept()方法上,不关心是否在其他位置关闭套接字 我可以在主服务器中使用一些标志,然后在这段时间后关闭套接字,但是这意味着我必须在客户端请求后自己连接到服务器,以便检查while条件,这听起来像是非常糟糕的编程 守则: import socket import sys from thread impor
import socket
import sys
from thread import *
HOST = '' # Symbolic name meaning all available interfaces
PORT = 9992 # Arbitrary non-privileged port
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
print 'Socket created'
#Bind socket to local host and port
try:
s.bind((HOST, PORT))
except socket.error , msg:
print 'Bind failed. Error Code : ' + str(msg[0]) + ' Message ' + msg[1]
sys.exit()
print 'Socket bind complete'
#Start listening on socket
s.listen(10)
print 'Socket now listening'
#Function for handling connections. This will be used to create threads
def clientthread(conn):
#Sending message to connected client
conn.send('Welcome to the server. Type something and hit enter\r\n') #send only takes string
data=''
#infinite loop so that function do not terminate and thread do not end.
while True:
#Receiving from client
data += conn.recv(1024)
print data
if data == 'CLOSE':
global s
conn.sendall('You have requested to destroy the connection...')
conn.close()
s.close()
return
if data.find('\n') != -1:
conn.sendall('OK...' + data + '\r\n')
data=''
#now keep talking with the client
while 1:
#wait to accept a connection - blocking call
try:
conn, addr = s.accept()
print 'Connected with ' + addr[0] + ':' + str(addr[1])
#start new thread takes 1st argument as a function name to be run, second is the tuple of arguments to the function.
start_new_thread(clientthread ,(conn,))
except:
print 'socket issue sorry'
break
这就是Python标准库为您提供帮助的地方。检查模块,或 通常没有理由不使用Python异步,因为它非常简单。作为奖励,您的代码将更具可读性和可维护性 您的代码与
asyncore
:
import asyncore
import socket
import sys
HOST = '' # Symbolic name meaning all available interfaces
PORT = 9992 # Arbitrary non-privileged port
class ExampleHandler(asyncore.dispatcher_with_send):
data = ''
def handle_read(self):
self.data += self.recv(1024)
lines = self.data.split('\n')
if len(lines) > 1:
self.data = lines[-1]
for line in lines:
if not line: continue
if line == 'CLOSE':
global s
self.send('You have requested to destroy the connection...\r\n')
self.close()
# To exit asyncore.loop() immediately,
# closing all client connections
raise asyncore.ExitNow()
# If you want to finish processing the client connections, you
# could instead close the server,
server.close()
else:
self.send('OK...%s\r\n' % line)
def handle_write(self):
self.send('Welcome to the server. Type something and hit enter\r\n')
class ExampleServer(asyncore.dispatcher):
def __init__(self, host, port):
asyncore.dispatcher.__init__(self)
self.create_socket(socket.AF_INET, socket.SOCK_STREAM)
self.set_reuse_addr()
self.bind((host, port))
self.listen(5)
def handle_accept(self):
pair = self.accept()
if pair is not None:
sock, addr = pair
print 'Connected with ' + addr[0] + ':' + str(addr[1])
handler = ExampleHandler(sock)
else:
print 'socket issue sorry'
server = ExampleServer(HOST, PORT)
try:
asyncore.loop()
except asyncore.ExitNow:
pass
注意:我还通过添加行缓冲区修复了原始代码中的字符串/缓冲问题。因此主线程在
s.accept()处阻塞。
。如果在套接字上调用close()?我认为accept()
应该会失败返回。@JonathonReinhart-它在我使用过的所有TCP堆栈上都会出现。你可以在这里尝试,关闭()后服务器仍在等待新的连接。一个小片段和/或示例的支持链接将使这个不错的答案成为一个很好的答案。