mirror of
https://github.com/pezkuwichain/pezkuwi-subxt.git
synced 2026-05-09 15:18:00 +00:00
Shawn Tabrizi
66 lines
2.1 KiB
Rust
66 lines
2.1 KiB
Rust
// Copyright 2019-2020 Parity Technologies (UK) Ltd.
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// This file is part of Substrate.
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// Substrate 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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// Substrate 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 Substrate. If not, see <http://www.gnu.org/licenses/>.
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//! Uncles functionality for Substrate.
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#![forbid(unsafe_code, missing_docs)]
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use sp_consensus::SelectChain;
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use sp_inherents::{InherentDataProviders};
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use log::warn;
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use sc_client_api::ProvideUncles;
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use sp_runtime::traits::{Block as BlockT, Header};
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use std::sync::Arc;
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use sp_authorship;
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/// Maximum uncles generations we may provide to the runtime.
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const MAX_UNCLE_GENERATIONS: u32 = 8;
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/// Register uncles inherent data provider, if not registered already.
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pub fn register_uncles_inherent_data_provider<B, C, SC>(
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client: Arc<C>,
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select_chain: SC,
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inherent_data_providers: &InherentDataProviders,
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) -> Result<(), sp_consensus::Error> where
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B: BlockT,
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C: ProvideUncles<B> + Send + Sync + 'static,
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SC: SelectChain<B> + 'static,
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{
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if !inherent_data_providers.has_provider(&sp_authorship::INHERENT_IDENTIFIER) {
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inherent_data_providers
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.register_provider(sp_authorship::InherentDataProvider::new(move || {
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{
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let chain_head = match select_chain.best_chain() {
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Ok(x) => x,
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Err(e) => {
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warn!(target: "uncles", "Unable to get chain head: {:?}", e);
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return Vec::new();
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}
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};
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match client.uncles(chain_head.hash(), MAX_UNCLE_GENERATIONS.into()) {
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Ok(uncles) => uncles,
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Err(e) => {
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warn!(target: "uncles", "Unable to get uncles: {:?}", e);
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Vec::new()
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}
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}
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}
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}))
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.map_err(|err| sp_consensus::Error::InherentData(err.into()))?;
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}
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Ok(())
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}
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