Feature: remove idle connections from pool

[rueian]

Currently connections in the connection pools (spool and dpool) inside a mux will live forever.

It would be nice if we had an option, such as ConnIdleDuration or a better naming, to clean connections that are idle for a long time to reduce memory usage.

[mingdaoy]

Hi @rueian, I'm interested in working on this issue!

[abuzaforfagun]

I am interested in working on this issue.

[proost]

@rueian
Does need option to min size of connection pool? making a new connection is expensive. If all connections is closed, can be harmful to latency sensitive apps. current pool only support cap size.

[rueian]

@rueian Does need option to min size of connection pool? making a new connection is expensive. If all connections is closed, can be harmful to latency sensitive apps. current pool only support cap size.

Yes, there should be an option for that.