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POShutting down gracefully from ThreadingTCPServer
 

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    <p>I've created a simple test app (Python 2.6.1) that runs a ThreadingTCPServer, based on the example <a href="http://danieldandrada.blogspot.com/2007/09/python-socketserverthreadingtcpserver.html" rel="nofollow noreferrer">here</a>. If the client sends a command "bye" I want to shut down the server and exit cleanly from the application. The exit part works OK, but when I try to re-run the app, I get:</p> <pre><code>socket.error: [Errno 48] Address already in use </code></pre> <p>I tried the solution given <a href="https://stackoverflow.com/questions/2274320/socketserver-threadingtcpserver-cannot-bind-to-address-after-program-restart">here</a> for setting the socket options but that didn't seem to help. I've tried various ways to close the server down, but always get the same error. </p> <p>Any idea what I'm doing wrong?</p> <pre><code>import SocketServer import socket import sys import threading import time class RequestHandler(SocketServer.BaseRequestHandler): def setup(self): print("Connection received from %s" % str(self.client_address)) self.request.send("Welcome!\n") def handle(self): while 1: data = self.request.recv(1024) if (data.strip() == 'bye'): print("Leaving server.") self.finish() self.server.shutdown() # None of these things seem to work either #time.sleep(2) #del self.server.socket #self.server.socket.shutdown(socket.SHUT_WR) #self.server.socket.close() #self.server.server_close() break def finish(self): self.request.send("Goodbye! Please come back soon.") if __name__ == "__main__": server = SocketServer.ThreadingTCPServer(("localhost", 9999), RequestHandler) # This doesn't seem to help. #server.socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT, 1) #server.socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) server.serve_forever() print("Exiting program.") </code></pre>
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    1. COHow long do you wait between when the program shuts down and when you start it up again?
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    2. COJust a few seconds. If I wait a minute or two, the TCP socket is released and everything's ok.
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    3. COSlight update. I was able to get the reuse address bit to work by doing this: SocketServer.ThreadingTCPServer.allow_reuse_address = True But I still don't understand why the server wasn't cleaned up in the first place.
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