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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>
135 lines
4.1 KiB
Rust
135 lines
4.1 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: Apache-2.0
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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use crate::{
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chain_spec,
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cli::{Cli, Subcommand},
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service,
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};
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use sc_cli::SubstrateCli;
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use sc_service::PartialComponents;
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#[cfg(feature = "try-runtime")]
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use try_runtime_cli::block_building_info::timestamp_with_aura_info;
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impl SubstrateCli for Cli {
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fn impl_name() -> String {
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"Substrate Node".into()
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}
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fn impl_version() -> String {
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env!("SUBSTRATE_CLI_IMPL_VERSION").into()
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}
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fn description() -> String {
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env!("CARGO_PKG_DESCRIPTION").into()
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}
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fn author() -> String {
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env!("CARGO_PKG_AUTHORS").into()
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}
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fn support_url() -> String {
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"support.anonymous.an".into()
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}
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fn copyright_start_year() -> i32 {
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2017
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}
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fn load_spec(&self, id: &str) -> Result<Box<dyn sc_service::ChainSpec>, String> {
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Ok(match id {
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"dev" => Box::new(chain_spec::development_config()?),
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path =>
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Box::new(chain_spec::ChainSpec::from_json_file(std::path::PathBuf::from(path))?),
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})
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}
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}
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/// Parse and run command line arguments
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pub fn run() -> sc_cli::Result<()> {
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let cli = Cli::from_args();
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match &cli.subcommand {
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Some(Subcommand::Key(cmd)) => cmd.run(&cli),
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Some(Subcommand::BuildSpec(cmd)) => {
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let runner = cli.create_runner(cmd)?;
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runner.sync_run(|config| cmd.run(config.chain_spec, config.network))
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},
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Some(Subcommand::CheckBlock(cmd)) => {
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let runner = cli.create_runner(cmd)?;
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runner.async_run(|config| {
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let PartialComponents { client, task_manager, import_queue, .. } =
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service::new_partial(&config)?;
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Ok((cmd.run(client, import_queue), task_manager))
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})
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},
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Some(Subcommand::ExportBlocks(cmd)) => {
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let runner = cli.create_runner(cmd)?;
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runner.async_run(|config| {
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let PartialComponents { client, task_manager, .. } = service::new_partial(&config)?;
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Ok((cmd.run(client, config.database), task_manager))
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})
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},
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Some(Subcommand::ExportState(cmd)) => {
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let runner = cli.create_runner(cmd)?;
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runner.async_run(|config| {
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let PartialComponents { client, task_manager, .. } = service::new_partial(&config)?;
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Ok((cmd.run(client, config.chain_spec), task_manager))
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})
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},
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Some(Subcommand::ImportBlocks(cmd)) => {
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let runner = cli.create_runner(cmd)?;
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runner.async_run(|config| {
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let PartialComponents { client, task_manager, import_queue, .. } =
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service::new_partial(&config)?;
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Ok((cmd.run(client, import_queue), task_manager))
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})
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},
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Some(Subcommand::PurgeChain(cmd)) => {
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let runner = cli.create_runner(cmd)?;
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runner.sync_run(|config| cmd.run(config.database))
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},
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Some(Subcommand::Revert(cmd)) => {
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let runner = cli.create_runner(cmd)?;
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runner.async_run(|config| {
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let PartialComponents { client, task_manager, backend, .. } =
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service::new_partial(&config)?;
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Ok((cmd.run(client, backend, None), task_manager))
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})
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},
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Some(Subcommand::ChainInfo(cmd)) => {
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let runner = cli.create_runner(cmd)?;
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runner.sync_run(|config| cmd.run::<runtime::interface::OpaqueBlock>(&config))
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},
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None => {
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let runner = cli.create_runner(&cli.run)?;
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runner.run_node_until_exit(|config| async move {
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match config.network.network_backend {
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sc_network::config::NetworkBackendType::Libp2p =>
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service::new_full::<sc_network::NetworkWorker<_, _>>(config, cli.consensus)
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.map_err(sc_cli::Error::Service),
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sc_network::config::NetworkBackendType::Litep2p => service::new_full::<
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sc_network::Litep2pNetworkBackend,
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>(config, cli.consensus)
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.map_err(sc_cli::Error::Service),
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}
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})
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},
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}
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}
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