def serve_socket_helper(sock, secure=False, vdb=None):
if secure:
log("requiring authentication")
try:
stream = SocketStream.from_secure_server_socket(sock, vdb)
except:
log("authenication failed")
sock.close()
else:
log("authentication successful")
serve_channel(Channel(stream))
else:
serve_channel(Channel(SocketStream(sock)))
