This only changes the script-layer API, but keeps the std::string host
in the C++ layer's ServerOptions. Mostly because the ixwebsocket library
takes host as std::string. Also, maybe at some point we'd want to
support something scheme-based like unix:///var/run/zeek.sock and placing
that in a string could not be totally wrong.
Add tests for IPV6, too.
I believe there's a bug/usage issue in the websockets library
where during send(), EOF is detected and stored, but the receiving
thread is then discarding the last received frame. Avoid the bug
by replacing the close_socket() implementation of the websockets
library just for that test and leave detecting the EOF condition
to the receiving thread.
The terminate-while-queueing test added for #4428 failed spuriously
indicating that sometimes WebSocket clients receive code 1000 instead of 1001.
This happens if the ixwebsocket server is shutdown before the reply thread had a
chance to process queued close messages.
Fix by signaling and waiting for the dispatcher's reply thread to terminate
before returning from Terminate().
Terminate() is called when Zeek shuts down. If WebSocket client threads
were blocked in QueueForProcessing() due to reaching queue limits, these
previously would not exit QueueForProcessing() and instead block
indefinitely, resulting in the ixwebsocket library blocking and its
garbage collection thread running at 100%. Not great.
Closing the onloop instance will unblock the WebSocket client threads
for a timely shutdown.
Closes#4420
