[英]How to gracefully end SocketServer
如果可能的話,我想留在std lib中。 我所有的線程都運行,並且套接字將正確偵聽。 我需要能夠正常關閉套接字,但似乎無法恢復正常關閉套接字。
問題是,當我進入server_close()時,它對我發了火(請參閱下面的異常跟蹤輸出)。
感謝您的光臨!
import sys
import threading
import SocketServer
class EchoRequestHandler(SocketServer.BaseRequestHandler):
def __init__(self, request, client_address, server):
SocketServer.BaseRequestHandler.__init__(self, request, client_address, server)
return
def setup(self):
return SocketServer.BaseRequestHandler.setup(self)
def handle(self):
# Echo the back to the client
data = self.request.recv(1024)
return
def finish(self):
return SocketServer.BaseRequestHandler.finish(self)
class EchoServer(SocketServer.TCPServer):
def __init__(self, server_address, handler_class=EchoRequestHandler):
SocketServer.TCPServer.__init__(self, server_address, handler_class)
return
def server_activate(self):
SocketServer.TCPServer.server_activate(self)
return
def serve_forever(self):
while True:
self.handle_request()
return
def server_close(self):
return SocketServer.TCPServer.server_close(self)
def bind_sockets(port_list):
server_list = []
for port in port_list:
server = EchoServer(("", int(port)), EchoRequestHandler)
server_thread = threading.Thread(target=server.serve_forever)
server_thread.setDaemon(True)
server_thread.start()
server_list.append(server)
print "listening on port", port
return server_list
def main():
port_list = [12345,54321]
active_servers = bind_sockets(port_list)
print "Hit Q to quit or R to reload."
while 1:
key_press = sys.stdin.read(1)
if key_press == "q":
sys.exit(2)
elif key_press == "r":
#We need to close gracefully so we can go on to do other stuff.
print active_servers.__len__()
for server in active_servers:
server.server_close()
print "closed"
if __name__ == "__main__":
main()
我得到的異常堆棧跟蹤是:
Exception in thread Thread-1: Traceback (most recent call last):
File "~snip~/threading.py", line 810, in __bootstrap_inner self.run()
File "~snip~/threading.py", line 763, in run self.__target(*self.__args, **self.__kwargs)
File "kill_thread.py", line 36, in serve_forever self.handle_request()
File "~snip~/SocketServer.py", line 276, in handle_request fd_sets = _eintr_retry(select.select, [self], [], [], timeout)
File "~snip~/SocketServer.py", line 155, in _eintr_retry return func(*args) error: (9, 'Bad file descriptor')
您有兩個問題:
像這樣:
# don't overrule server_forever, the default implementation
# handles the shutdown()
#def serve_forever(self):
# while True:
# self.handle_request()
# return
def server_close(self):
self.shutdown()
return SocketServer.TCPServer.server_close(self)
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