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https://github.com/pezkuwichain/pezkuwi-subxt.git
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Aaro Altonen
80616f6d03
[litep2p](https://github.com/altonen/litep2p) is a libp2p-compatible P2P networking library. It supports all of the features of `rust-libp2p` that are currently being utilized by Polkadot SDK. Compared to `rust-libp2p`, `litep2p` has a quite different architecture which is why the new `litep2p` network backend is only able to use a little of the existing code in `sc-network`. The design has been mainly influenced by how we'd wish to structure our networking-related code in Polkadot SDK: independent higher-levels protocols directly communicating with the network over links that support bidirectional backpressure. A good example would be `NotificationHandle`/`RequestResponseHandle` abstractions which allow, e.g., `SyncingEngine` to directly communicate with peers to announce/request blocks. I've tried running `polkadot --network-backend litep2p` with a few different peer configurations and there is a noticeable reduction in networking CPU usage. For high load (`--out-peers 200`), networking CPU usage goes down from ~110% to ~30% (80 pp) and for normal load (`--out-peers 40`), the usage goes down from ~55% to ~18% (37 pp). These should not be taken as final numbers because: a) there are still some low-hanging optimization fruits, such as enabling [receive window auto-tuning](https://github.com/libp2p/rust-yamux/pull/176), integrating `Peerset` more closely with `litep2p` or improving memory usage of the WebSocket transport b) fixing bugs/instabilities that incorrectly cause `litep2p` to do less work will increase the networking CPU usage c) verification in a more diverse set of tests/conditions is needed Nevertheless, these numbers should give an early estimate for CPU usage of the new networking backend. This PR consists of three separate changes: * introduce a generic `PeerId` (wrapper around `Multihash`) so that we don't have use `NetworkService::PeerId` in every part of the code that uses a `PeerId` * introduce `NetworkBackend` trait, implement it for the libp2p network stack and make Polkadot SDK generic over `NetworkBackend` * implement `NetworkBackend` for litep2p The new library should be considered experimental which is why `rust-libp2p` will remain as the default option for the time being. This PR currently depends on the master branch of `litep2p` but I'll cut a new release for the library once all review comments have been addresses. --------- Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> Co-authored-by: Dmitry Markin <dmitry@markin.tech> Co-authored-by: Alexandru Vasile <60601340+lexnv@users.noreply.github.com> Co-authored-by: Alexandru Vasile <alexandru.vasile@parity.io>
62 lines
2.0 KiB
Rust
62 lines
2.0 KiB
Rust
// Copyright (C) Parity Technologies (UK) Ltd.
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// This file is part of Polkadot.
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// Polkadot is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// Polkadot is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with Polkadot. If not, see <http://www.gnu.org/licenses/>.
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//! Authority discovery service interfacing.
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use std::{collections::HashSet, fmt::Debug};
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use async_trait::async_trait;
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use sc_authority_discovery::Service as AuthorityDiscoveryService;
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use polkadot_primitives::AuthorityDiscoveryId;
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use sc_network::Multiaddr;
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use sc_network_types::PeerId;
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/// An abstraction over the authority discovery service.
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///
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/// Needed for mocking in tests mostly.
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#[async_trait]
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pub trait AuthorityDiscovery: Send + Debug + 'static {
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/// Get the addresses for the given [`AuthorityDiscoveryId`] from the local address cache.
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async fn get_addresses_by_authority_id(
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&mut self,
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authority: AuthorityDiscoveryId,
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) -> Option<HashSet<Multiaddr>>;
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/// Get the [`AuthorityDiscoveryId`] for the given [`PeerId`] from the local address cache.
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async fn get_authority_ids_by_peer_id(
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&mut self,
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peer_id: PeerId,
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) -> Option<HashSet<AuthorityDiscoveryId>>;
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}
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#[async_trait]
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impl AuthorityDiscovery for AuthorityDiscoveryService {
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async fn get_addresses_by_authority_id(
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&mut self,
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authority: AuthorityDiscoveryId,
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) -> Option<HashSet<Multiaddr>> {
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AuthorityDiscoveryService::get_addresses_by_authority_id(self, authority).await
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}
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async fn get_authority_ids_by_peer_id(
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&mut self,
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peer_id: PeerId,
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) -> Option<HashSet<AuthorityDiscoveryId>> {
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AuthorityDiscoveryService::get_authority_ids_by_peer_id(self, peer_id).await
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}
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}
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