* Use a single exchange instead of two one_shots.
* Add `Throttled` to libp2p-request-response.
Wraps the existing `RequestResponse` behaviour and applies strict limits
to the number of inbound and outbound requests per peer.
The wrapper is opt-in and if not used, the protocol behaviour of
`RequestResponse` does not change. This PR also does not introduce
an extra protocol, hence the limits applied need to be known a priori
for all nodes which is not always possible or desirable. As mentioned
in #1687 I think that we should eventually augment the protocol with
metadata which allows a more dynamic exchange of requests and responses.
This PR also replaces the two oneshot channels with a single one from the
scambio crate which saves one allocation per request/response. If not
desirable because the crate has seen less testing the first commit could
be reverted.
* Fix rustdoc error.
* Remove some leftovers from development.
* Add docs to `NetworBehaviourAction::{map_in,map_out}`.
* Apply suggestions from code review
Co-authored-by: Roman Borschel <romanb@users.noreply.github.com>
* Add `ping_protocol_throttled` test.
* Add another test.
* Revert "Use a single exchange instead of two one_shots."
This reverts commit e34e1297d411298f6c69e238aa6c96e0b795d989.
# Conflicts:
# protocols/request-response/Cargo.toml
# protocols/request-response/src/handler/protocol.rs
* Update CHANGELOG.
* Update CHANGELOG.
Co-authored-by: Roman Borschel <romanb@users.noreply.github.com>
