Detect TCP connection termination in CLI

[sehz]

Both produce and consumer has continuous way to fetch producer and consumer. If connection to server goes down, it should immediately terminate it to give user good experience

Scope: If a Fluvio operation (e.g. consume) would stay open, but the connection is terminated, the CLI should gracefully exit and print a message describing what happened.

[sehz]

It seems it is possible by turning on client side keep alive and check for error.

https://blog.cloudflare.com/when-tcp-sockets-refuse-to-die
https://stackoverflow.com/questions/722240/instantly-detect-client-disconnection-from-server-socket

[nicholastmosher]

Test if this is still a problem

[simlay]

infinyon/fluvio-socket#22 should have helped with this but because there's a new enum in FlvSocketError, the auth workspace doesn't like it due to the map_err. I didn't think it was a breaking change with infinyon/fluvio-socket#22 but maybe I was wrong.

[nicholastmosher]

We need some lower-level machinery updates in order to gracefully handle the producer case of this issue. For now it should be sufficient for the CLI to timeout and print a message which is what happens today.