SocketServer bind multiple server

Question

I'm trying to bind multiple servers with python's SocketServer module:

import SocketServer
from SocketServer import BaseRequestHandler

class HTTPSERVER(BaseRequestHandler):

    def handle(self):
        rec = self.request.recv(1024)
        if rec:
           self.request.send('Got something!')

launchme = SocketServer.TCPServer(('', 82),HTTPSERVER)
launchme2 = SocketServer.TCPServer(('', 81),HTTPSERVER)
launchme3 = SocketServer.TCPServer(('', 80),HTTPSERVER)
launchme.serve_forever()
print 'reached first server'
launchme2.serve_forever()
print 'reached second server'
launchme3.serve_forever()
print 'reached third server'

When this script is launched nothing gets printed but all 3 ports are actually open:

root@user:/# netstat -pna|more
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
tcp        0      0 0.0.0.0:80              0.0.0.0:*               LISTEN      2751/python     
tcp        0      0 0.0.0.0:81              0.0.0.0:*               LISTEN      2751/python     
tcp        0      0 0.0.0.0:82              0.0.0.0:*               LISTEN      2751/python    

But this script only serve 'Got something!' when the request is made on port 82 (first bind). What is the proper way with the SocketServer module to get all port to work?

Answer 1

server_forever handles requests until an explicit shutdown() request.

Once launchme.serve_forever() called, the next ones will not be called. You need to call them in threads or in separated processes.

import SocketServer
from SocketServer import BaseRequestHandler
import threading

class HTTPSERVER(BaseRequestHandler):

    def handle(self):
        rec = self.request.recv(1024)
        if rec:
           self.request.send('Got something!')

launchme = SocketServer.TCPServer(('', 82),HTTPSERVER)
launchme2 = SocketServer.TCPServer(('', 81),HTTPSERVER)
launchme3 = SocketServer.TCPServer(('', 80),HTTPSERVER)
t1 = threading.Thread(target=launchme.serve_forever)
t2 = threading.Thread(target=launchme2.serve_forever)
t3 = threading.Thread(target=launchme3.serve_forever)
for t in t1, t2, t3: t.start()
for t in t1, t2, t3: t.join()