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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>
65 lines
2.3 KiB
Rust
65 lines
2.3 KiB
Rust
// This file is part of Substrate.
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// Copyright (C) Parity Technologies (UK) Ltd.
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// SPDX-License-Identifier: GPL-3.0-or-later WITH Classpath-exception-2.0
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// This program 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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// This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
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//! Helpers for outgoing and incoming light client requests.
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use sc_network::{config::ProtocolId, request_responses::IncomingRequest, NetworkBackend};
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use sp_runtime::traits::Block;
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use std::time::Duration;
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/// For incoming light client requests.
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pub mod handler;
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/// Generate the light client protocol name from the genesis hash and fork id.
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fn generate_protocol_name<Hash: AsRef<[u8]>>(genesis_hash: Hash, fork_id: Option<&str>) -> String {
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let genesis_hash = genesis_hash.as_ref();
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if let Some(fork_id) = fork_id {
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format!("/{}/{}/light/2", array_bytes::bytes2hex("", genesis_hash), fork_id)
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} else {
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format!("/{}/light/2", array_bytes::bytes2hex("", genesis_hash))
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}
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}
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/// Generate the legacy light client protocol name from chain specific protocol identifier.
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fn generate_legacy_protocol_name(protocol_id: &ProtocolId) -> String {
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format!("/{}/light/2", protocol_id.as_ref())
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}
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/// Generates a `RequestResponseProtocolConfig` for the light client request protocol, refusing
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/// incoming requests.
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pub fn generate_protocol_config<
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Hash: AsRef<[u8]>,
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B: Block,
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N: NetworkBackend<B, <B as Block>::Hash>,
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>(
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protocol_id: &ProtocolId,
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genesis_hash: Hash,
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fork_id: Option<&str>,
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inbound_queue: async_channel::Sender<IncomingRequest>,
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) -> N::RequestResponseProtocolConfig {
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N::request_response_config(
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generate_protocol_name(genesis_hash, fork_id).into(),
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std::iter::once(generate_legacy_protocol_name(protocol_id).into()).collect(),
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1 * 1024 * 1024,
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16 * 1024 * 1024,
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Duration::from_secs(15),
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Some(inbound_queue),
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)
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}
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