BEEFY: introduce offence report system

frame/babe/src/equivocation.rs

@@ -95,14 +95,16 @@ impl<Offender: Clone> Offence<Offender> for EquivocationOffence<Offender> {
 	}
 }
 
-/// Babe equivocation offence system.
+/// BABE equivocation offence report system.
 ///
-/// This type implements `OffenceReportSystem`
+/// This type implements `OffenceReportSystem` such that:
+/// - Equivocation reports are published on-chain as unsigned extrinsic via
+///   `offchain::SendTransactioinsTypes`.
+/// - On-chain validity checks and processing are mostly delegated to the user provided generic
+///   types implementing `KeyOwnerProofSystem` and `ReportOffence` traits.
+/// - Offence reporter for unsigned transactions is fetched via the the authorship pallet.
 pub struct EquivocationReportSystem<T, R, P, L>(sp_std::marker::PhantomData<(T, R, P, L)>);
 
-// We use the authorship pallet to fetch the current block author and use
-// `offchain::SendTransactionTypes` for unsigned extrinsic creation and
-// submission.
 impl<T, R, P, L>
 	OffenceReportSystem<Option<T::AccountId>, (EquivocationProof<T::Header>, T::KeyOwnerProof)>
 	for EquivocationReportSystem<T, R, P, L>
@@ -131,7 +133,7 @@ where
 		};
 		let res = SubmitTransaction::<T, Call<T>>::submit_unsigned_transaction(call.into());
 		match res {
-			Ok(()) => info!(target: LOG_TARGET, "Submitted equivocation report."),
+			Ok(_) => info!(target: LOG_TARGET, "Submitted equivocation report"),
 			Err(e) => error!(target: LOG_TARGET, "Error submitting equivocation report: {:?}", e),
 		}
 		res

frame/beefy-mmr/src/mock.rs

@@ -21,11 +21,11 @@ use codec::Encode;
 use frame_support::{
 	construct_runtime, parameter_types,
 	sp_io::TestExternalities,
-	traits::{ConstU16, ConstU32, ConstU64, GenesisBuild, KeyOwnerProofSystem},
+	traits::{ConstU16, ConstU32, ConstU64, GenesisBuild},
 	BasicExternalities,
 };
 use sp_consensus_beefy::mmr::MmrLeafVersion;
-use sp_core::{crypto::KeyTypeId, Hasher, H256};
+use sp_core::{Hasher, H256};
 use sp_runtime::{
 	app_crypto::ecdsa::Public,
 	impl_opaque_keys,
@@ -124,18 +124,12 @@ impl pallet_mmr::Config for Test {
 
 impl pallet_beefy::Config for Test {
 	type BeefyId = BeefyId;
-	type KeyOwnerProofSystem = ();
-	type KeyOwnerProof =
-		<Self::KeyOwnerProofSystem as KeyOwnerProofSystem<(KeyTypeId, BeefyId)>>::Proof;
-	type KeyOwnerIdentification = <Self::KeyOwnerProofSystem as KeyOwnerProofSystem<(
-		KeyTypeId,
-		BeefyId,
-	)>>::IdentificationTuple;
-	type HandleEquivocation = ();
 	type MaxAuthorities = ConstU32<100>;
 	type MaxSetIdSessionEntries = ConstU64<100>;
 	type OnNewValidatorSet = BeefyMmr;
 	type WeightInfo = ();
+	type KeyOwnerProof = sp_core::Void;
+	type EquivocationReportSystem = ();
 }
 
 parameter_types! {