Bounded

[freesig]

PR summary

Adds bounded channels to prevent memory building up in unbounded channels

testing/benchmarking notes

( if any manual testing or benchmarking was/should be done, add notes and/or screenshots here )

followups

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changelog

• if this is a code change that effects some consumer (e.g. zome developers) of holochain core, then it has been added to our between-release changelog with the format

- summary of change [PR#1234](https://github.com/holochain/holochain-rust/pull/1234)

documentation

• this code has been documented according to our docs checklist

[neonphog]

uhhh - if we clone the state here the new connection will get added to the clone and not the actual state - then get dropped.

[neonphog]

scratch that - I see this is cloning the handle not the state : )

[neonphog]

The sim2h side looks awesome! nice work async-ifying everything!

[zippy]

When I test manually I see lots of problems with not being able to get a lock on state in the action loop. Also you can't ctrl-c out of the conductor any more.

[neonphog]

Using spawn_blocking for the for the crossbeam_channel blocking sends actually makes this playground work - although I at least get three would-block thread panics - so maybe 1000 is more than it can keep up with?

https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=579de08c026ae6005e1c0ffdb319be54

[freesig]

Oh yeh I haven't figured out how to get the shutdown to happen on this properly yet. Maybe test it if and then if it's helpful I can look at how to do that.