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// Copyright 2019-2023 Parity Technologies (UK) Ltd.
// This file is part of Parity Bridges Common.
// Parity Bridges Common 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.
// Parity Bridges Common 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 Parity Bridges Common. If not, see <http://www.gnu.org/licenses/>.
//! Types and functions intended to ease adding of new Substrate -> Substrate
//! equivocation detection pipelines.
use crate::finality_base::SubstrateFinalityPipeline;
use std::marker::PhantomData;
use crate::finality_base::engine::Engine;
use async_trait::async_trait;
use bp_runtime::{BlockNumberOf, HashOf};
use pallet_grandpa::{Call as GrandpaCall, Config as GrandpaConfig};
use relay_substrate_client::CallOf;
use sp_runtime::traits::{Block, Header};
/// Substrate -> Substrate equivocation detection pipeline.
#[async_trait]
pub trait SubstrateEquivocationDetectionPipeline: SubstrateFinalityPipeline {
/// How the `report_equivocation` call is built ?
type ReportEquivocationCallBuilder: ReportEquivocationCallBuilder<Self>;
}
type EquivocationProofOf<P> = <<P as SubstrateFinalityPipeline>::FinalityEngine as Engine<
<P as SubstrateFinalityPipeline>::SourceChain,
>>::EquivocationProof;
type KeyOwnerProofOf<P> = <<P as SubstrateFinalityPipeline>::FinalityEngine as Engine<
<P as SubstrateFinalityPipeline>::SourceChain,
>>::KeyOwnerProof;
/// Different ways of building `report_equivocation` calls.
pub trait ReportEquivocationCallBuilder<P: SubstrateEquivocationDetectionPipeline> {
/// Build a `report_equivocation` call to be executed on the source chain.
fn build_report_equivocation_call(
equivocation_proof: EquivocationProofOf<P>,
key_owner_proof: KeyOwnerProofOf<P>,
) -> CallOf<P::SourceChain>;
}
/// Building the `report_equivocation` call when having direct access to the target chain runtime.
pub struct DirectReportGrandpaEquivocationCallBuilder<P, R> {
_phantom: PhantomData<(P, R)>,
}
impl<P, R> ReportEquivocationCallBuilder<P> for DirectReportGrandpaEquivocationCallBuilder<P, R>
where
P: SubstrateEquivocationDetectionPipeline,
P::FinalityEngine: Engine<
P::SourceChain,
EquivocationProof = sp_consensus_grandpa::EquivocationProof<
HashOf<P::SourceChain>,
BlockNumberOf<P::SourceChain>,
>,
>,
R: frame_system::Config<Hash = HashOf<P::SourceChain>>
+ GrandpaConfig<KeyOwnerProof = KeyOwnerProofOf<P>>,
<R::Block as Block>::Header: Header<Number = BlockNumberOf<P::SourceChain>>,
CallOf<P::SourceChain>: From<GrandpaCall<R>>,
{
fn build_report_equivocation_call(
equivocation_proof: EquivocationProofOf<P>,
key_owner_proof: KeyOwnerProofOf<P>,
) -> CallOf<P::SourceChain> {
GrandpaCall::<R>::report_equivocation {
equivocation_proof: Box::new(equivocation_proof),
key_owner_proof,
}
.into()
}
}