mirror of
https://github.com/pezkuwichain/pezkuwi-subxt.git
synced 2026-06-17 05:31:02 +00:00
Gav Wood
91 lines
2.9 KiB
Rust
91 lines
2.9 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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//! Inherents for BABE
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use sp_inherents::{Error, InherentData, InherentIdentifier};
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#[cfg(feature = "std")]
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use sp_inherents::{InherentDataProviders, ProvideInherentData};
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#[cfg(feature = "std")]
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use sp_timestamp::TimestampInherentData;
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#[cfg(feature = "std")]
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use codec::Decode;
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use sp_std::result::Result;
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/// The BABE inherent identifier.
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pub const INHERENT_IDENTIFIER: InherentIdentifier = *b"babeslot";
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/// The type of the BABE inherent.
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pub type InherentType = u64;
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/// Auxiliary trait to extract BABE inherent data.
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pub trait BabeInherentData {
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/// Get BABE inherent data.
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fn babe_inherent_data(&self) -> Result<InherentType, Error>;
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/// Replace BABE inherent data.
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fn babe_replace_inherent_data(&mut self, new: InherentType);
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}
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impl BabeInherentData for InherentData {
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fn babe_inherent_data(&self) -> Result<InherentType, Error> {
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self.get_data(&INHERENT_IDENTIFIER)
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.and_then(|r| r.ok_or_else(|| "BABE inherent data not found".into()))
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}
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fn babe_replace_inherent_data(&mut self, new: InherentType) {
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self.replace_data(INHERENT_IDENTIFIER, &new);
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}
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}
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/// Provides the slot duration inherent data for BABE.
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#[cfg(feature = "std")]
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pub struct InherentDataProvider {
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slot_duration: u64,
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}
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#[cfg(feature = "std")]
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impl InherentDataProvider {
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/// Constructs `Self`
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pub fn new(slot_duration: u64) -> Self {
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Self { slot_duration }
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}
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}
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#[cfg(feature = "std")]
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impl ProvideInherentData for InherentDataProvider {
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fn on_register(&self, providers: &InherentDataProviders) -> Result<(), Error> {
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if !providers.has_provider(&sp_timestamp::INHERENT_IDENTIFIER) {
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// Add the timestamp inherent data provider, as we require it.
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providers.register_provider(sp_timestamp::InherentDataProvider)
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} else {
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Ok(())
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}
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}
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fn inherent_identifier(&self) -> &'static InherentIdentifier {
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&INHERENT_IDENTIFIER
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}
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fn provide_inherent_data(&self, inherent_data: &mut InherentData) -> Result<(), Error> {
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let timestamp = inherent_data.timestamp_inherent_data()?;
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let slot_number = timestamp / self.slot_duration;
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inherent_data.put_data(INHERENT_IDENTIFIER, &slot_number)
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}
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fn error_to_string(&self, error: &[u8]) -> Option<String> {
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Error::decode(&mut &error[..]).map(|e| e.into_string()).ok()
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}
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}
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