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problem: ZMQ_HEARTBEAT is not useful without sending an hello message

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When using ZMQ_HEARTBEAT one still needs to implement application-level heartbeat in order to know when to send a hello message.
For example, with the majordomo protocol, the worker needs to send a READY message when connecting to a broker. If the connection to the broker drops, and the heartbeat recognizes it the worker won't know about it and won't send the READY msg.
To solve that, the majordomo worker still has to implement heartbeat. With this new option, whenever the connection drops and reconnects the hello message will be sent, greatly simplify the majordomo protocol, as now READY and HEARTBEAT can be handled by zeromq.
This commit is contained in:
Doron Somech
2020-04-17 09:50:59 +03:00
parent 718ad8ab96
commit 93da6763b0
18 changed files with 260 additions and 2 deletions
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17
src/options.cpp
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@@ -249,7 +249,9 @@ zmq::options_t::options_t () :
zero_copy (true),
router_notify (0),
monitor_event_version (1),
wss_trust_system (false)
wss_trust_system (false),
hello_msg (),
can_send_hello_msg (false)
{
memset (curve_public_key, 0, CURVE_KEYSIZE);
memset (curve_secret_key, 0, CURVE_KEYSIZE);
@@ -813,6 +815,19 @@ int zmq::options_t::setsockopt (int option_,
return do_setsockopt_int_as_bool_strict (optval_, optvallen_,
&wss_trust_system);
#endif
case ZMQ_HELLO_MSG:
if (optvallen_ > 0) {
unsigned char *bytes = (unsigned char *) optval_;
hello_msg =
std::vector<unsigned char> (bytes, bytes + optvallen_);
} else {
hello_msg = std::vector<unsigned char> ();
}
return 0;
#endif
default: