Internal panic in increment_channels_for_key

[cswinter]

tarpc sometimes panics at filter.rs:230 with 'called `Option::unwrap()` on a `None` value'. I don't have a minimal example/reliable way to reproduce, the program where this happens configures high limits for max channels/max channels per key and quickly creates/drops many clients to a server running on localhost.

[cswinter]

Adding a connection pool that reuses clients to all destinations (rather than creating a new client on each request) seems to make the panic disappear in my case. It would still be quite desirable to find a fix since the panic could be triggered by reasonable usage. E.g. a connection pool with a bounded number of active connections may be forced to drop/recreate clients at a high rate.

[tikue]

Thank you for the report! I'll look into it.

[tikue]

I think this was fixed in a11d4ff. I'll publish a new version with the fix.

[tikue]

I've release v0.21.0 which contains this fix.