1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63
// This file is part of Substrate.
// Copyright (C) Parity Technologies (UK) Ltd.
// SPDX-License-Identifier: GPL-3.0-or-later WITH Classpath-exception-2.0
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
//! Aura (Authority-Round) digests
//!
//! This implements the digests for AuRa, to allow the private
//! `CompatibleDigestItem` trait to appear in public interfaces.
use crate::AURA_ENGINE_ID;
use codec::{Codec, Encode};
use sp_consensus_slots::Slot;
use sp_runtime::generic::DigestItem;
/// A digest item which is usable with aura consensus.
pub trait CompatibleDigestItem<Signature>: Sized {
/// Construct a digest item which contains a signature on the hash.
fn aura_seal(signature: Signature) -> Self;
/// If this item is an Aura seal, return the signature.
fn as_aura_seal(&self) -> Option<Signature>;
/// Construct a digest item which contains the slot number
fn aura_pre_digest(slot: Slot) -> Self;
/// If this item is an AuRa pre-digest, return the slot number
fn as_aura_pre_digest(&self) -> Option<Slot>;
}
impl<Signature> CompatibleDigestItem<Signature> for DigestItem
where
Signature: Codec,
{
fn aura_seal(signature: Signature) -> Self {
DigestItem::Seal(AURA_ENGINE_ID, signature.encode())
}
fn as_aura_seal(&self) -> Option<Signature> {
self.seal_try_to(&AURA_ENGINE_ID)
}
fn aura_pre_digest(slot: Slot) -> Self {
DigestItem::PreRuntime(AURA_ENGINE_ID, slot.encode())
}
fn as_aura_pre_digest(&self) -> Option<Slot> {
self.pre_runtime_try_to(&AURA_ENGINE_ID)
}
}