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* 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>