Communicate between two socket server

Question

I have two TCP socket server in python, each with some (about 4) clients. I want the two server to be able to talk to each other so both can send commands to each other and communicate.

Is this possible? And if yes, how?

• sp________: yes of course you have just to make one of them client of the other
• sp________: I don't know what you really mean, but he will continue to serve his clients as well
• Michi Gruber: I'm a bit confused right now, sorry, I'm new in programming. So how can I make a computer act like a client and as a server? Even if I try to use the same port it gives me an error...
• sp________: okay, I will post a complete answer with a brief example on how you can do that
• Sedy Vlk: take a look at zeromq, all the network stuff will be abstracted from you and you can focus on your problem

Answer 1

This is an example:

import socket
socket_between_servers = None
def connect_to(host='', port=1060):
 global socket_between_servers
 sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
 try:
 sock.connect((host, port)) #check if the first server is already waiting
 socket_between_servers = sock
 except socket.error:
 s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
 s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
 s.bind((host, port))
 s.listen(5) # waiting for the 4 clients plus the other server
 print 'waiting for the peers...'
 n = 0
 while n < 5:
 sc, sockname = s.accept()
 if sockname == 'ip addresse of the other server':
 socket_between_servers = sc
 n += 1
 else:
 s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
 s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
 s.bind((host, port + 1))
 s.listen(4) # waiting for the 4 clients
 n = 0
 while n < 4:
 sc, sockname = s.accept()

then with socket_between_servers the servers can communicate

• Michi Gruber: thanks! i understand the concept now and will try to implement that