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zmq: enable tcp keepalive

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mruddy 2018-11-08 06:38:21 -05:00
parent e74649e951
commit c276df7759
2 changed files with 22 additions and 0 deletions
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14
doc/zmq.md
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@ -98,6 +98,20 @@ ZMQ_SUBSCRIBE option set to one or either of these prefixes (for
instance, just `hash`); without doing so will result in no messages
arriving. Please see `contrib/zmq/zmq_sub.py` for a working example.
The ZMQ_PUB socket's ZMQ_TCP_KEEPALIVE option is enabled. This means that
the underlying SO_KEEPALIVE option is enabled when using a TCP transport.
The effective TCP keepalive values are managed through the underlying
operating system configuration and must be configured prior to connection establishment.
For example, when running on GNU/Linux, one might use the following
to lower the keepalive setting to 10 minutes:
sudo sysctl -w net.ipv4.tcp_keepalive_time=600
Setting the keepalive values appropriately for your operating environment may
improve connectivity in situations where long-lived connections are silently
dropped by network middle boxes.
## Remarks
From the perspective of bitcoind, the ZeroMQ socket is write-only; PUB

8
src/zmq/zmqpublishnotifier.cpp
View file

@ -86,6 +86,14 @@ bool CZMQAbstractPublishNotifier::Initialize(void *pcontext)
return false;
}
const int so_keepalive_option {1};
rc = zmq_setsockopt(psocket, ZMQ_TCP_KEEPALIVE, &so_keepalive_option, sizeof(so_keepalive_option));
if (rc != 0) {
zmqError("Failed to set SO_KEEPALIVE");
zmq_close(psocket);
return false;
}
rc = zmq_bind(psocket, address.c_str());
if (rc != 0)
{