def ping(self, address, timeout, size, request_id, seq):
"""
Send echo request and returns future
"""
# @todo: Check timeout
logger.debug("[%s] Ping (req=%s, seq=%s, timeout=%sms)", address,
request_id, seq, timeout)
msg = self.build_echo_request(size, request_id, seq)
sid = (address, request_id, seq)
f = Future()
f.sid = sid
self.sessions[sid] = f
self.send(address, msg)
IOLoop.current().call_later(timeout / 1000.0,
functools.partial(self.on_timeout, f))
return f
