Expose MMR root through runtime API - use it in BEEFY client

Cargo.toml

@@ -101,7 +101,6 @@ members = [
 	"frame/lottery",
 	"frame/membership",
 	"frame/merkle-mountain-range",
-	"frame/merkle-mountain-range/primitives",
 	"frame/merkle-mountain-range/rpc",
 	"frame/multisig",
 	"frame/nicks",
@@ -172,6 +171,7 @@ members = [
 	"primitives/keyring",
 	"primitives/keystore",
 	"primitives/maybe-compressed-blob",
+	"primitives/merkle-mountain-range",
 	"primitives/npos-elections",
 	"primitives/npos-elections/fuzzer",
 	"primitives/offchain",

bin/node/runtime/src/lib.rs

@@ -1261,7 +1261,7 @@ impl pallet_mmr::Config for Runtime {
 	const INDEXING_PREFIX: &'static [u8] = b"mmr";
 	type Hashing = <Runtime as frame_system::Config>::Hashing;
 	type Hash = <Runtime as frame_system::Config>::Hash;
-	type LeafData = frame_system::Pallet<Self>;
+	type LeafData = pallet_mmr::ParentNumberAndHash<Self>;
 	type OnNewRoot = ();
 	type WeightInfo = ();
 }
@@ -1804,6 +1804,10 @@ impl_runtime_apis! {
 			let node = mmr::DataOrHash::Data(leaf.into_opaque_leaf());
 			pallet_mmr::verify_leaf_proof::<mmr::Hashing, _>(root, node, proof)
 		}
+
+		fn mmr_root() -> Result<mmr::Hash, mmr::Error> {
+			Ok(Mmr::mmr_root())
+		}
 	}
 
 	impl sp_session::SessionKeys<Block> for Runtime {

client/beefy/Cargo.toml

@@ -27,6 +27,7 @@ sp-blockchain = { version = "4.0.0-dev", path = "../../primitives/blockchain" }
 sp-consensus = { version = "0.10.0-dev", path = "../../primitives/consensus/common" }
 sp-core = { version = "6.0.0", path = "../../primitives/core" }
 sp-keystore = { version = "0.12.0", path = "../../primitives/keystore" }
+sp-mmr-primitives = { version = "4.0.0-dev", path = "../../primitives/merkle-mountain-range" }
 sp-runtime = { version = "6.0.0", path = "../../primitives/runtime" }
 
 sc-chain-spec = { version = "4.0.0-dev", path = "../../client/chain-spec" }

client/beefy/src/lib.rs

@@ -27,9 +27,10 @@ use sp_api::ProvideRuntimeApi;
 use sp_blockchain::HeaderBackend;
 use sp_consensus::SyncOracle;
 use sp_keystore::SyncCryptoStorePtr;
+use sp_mmr_primitives::MmrApi;
 use sp_runtime::traits::Block;
 
-use beefy_primitives::BeefyApi;
+use beefy_primitives::{BeefyApi, MmrRootHash};
 
 use crate::notification::{BeefyBestBlockSender, BeefySignedCommitmentSender};
 
@@ -87,7 +88,7 @@ pub fn beefy_peers_set_config(
 /// of today, Rust does not allow a type alias to be used as a trait bound. Tracking
 /// issue is <https://github.com/rust-lang/rust/issues/41517>.
 pub trait Client<B, BE>:
-	BlockchainEvents<B> + HeaderBackend<B> + Finalizer<B, BE> + ProvideRuntimeApi<B> + Send + Sync
+	BlockchainEvents<B> + HeaderBackend<B> + Finalizer<B, BE> + Send + Sync
 where
 	B: Block,
 	BE: Backend<B>,
@@ -110,18 +111,21 @@ where
 }
 
 /// BEEFY gadget initialization parameters.
-pub struct BeefyParams<B, BE, C, N>
+pub struct BeefyParams<B, BE, C, N, R>
 where
 	B: Block,
 	BE: Backend<B>,
 	C: Client<B, BE>,
-	C::Api: BeefyApi<B>,
+	R: ProvideRuntimeApi<B>,
+	R::Api: BeefyApi<B> + MmrApi<B, MmrRootHash>,
 	N: GossipNetwork<B> + Clone + SyncOracle + Send + Sync + 'static,
 {
 	/// BEEFY client
 	pub client: Arc<C>,
 	/// Client Backend
 	pub backend: Arc<BE>,
+	/// Runtime Api Provider
+	pub runtime: Arc<R>,
 	/// Local key store
 	pub key_store: Option<SyncCryptoStorePtr>,
 	/// Gossip network
@@ -138,21 +142,22 @@ where
 	pub protocol_name: std::borrow::Cow<'static, str>,
 }
 
-#[cfg(not(test))]
 /// Start the BEEFY gadget.
 ///
 /// This is a thin shim around running and awaiting a BEEFY worker.
-pub async fn start_beefy_gadget<B, BE, C, N>(beefy_params: BeefyParams<B, BE, C, N>)
+pub async fn start_beefy_gadget<B, BE, C, N, R>(beefy_params: BeefyParams<B, BE, C, N, R>)
 where
 	B: Block,
 	BE: Backend<B>,
 	C: Client<B, BE>,
-	C::Api: BeefyApi<B>,
+	R: ProvideRuntimeApi<B>,
+	R::Api: BeefyApi<B> + MmrApi<B, MmrRootHash>,
 	N: GossipNetwork<B> + Clone + SyncOracle + Send + Sync + 'static,
 {
 	let BeefyParams {
 		client,
 		backend,
+		runtime,
 		key_store,
 		network,
 		signed_commitment_sender,
@@ -188,6 +193,7 @@ where
 	let worker_params = worker::WorkerParams {
 		client,
 		backend,
+		runtime,
 		key_store: key_store.into(),
 		signed_commitment_sender,
 		beefy_best_block_sender,
@@ -198,7 +204,7 @@ where
 		sync_oracle,
 	};
 
-	let worker = worker::BeefyWorker::<_, _, _, _>::new(worker_params);
+	let worker = worker::BeefyWorker::<_, _, _, _, _>::new(worker_params);
 
 	worker.run().await
 }

client/beefy/src/metrics.rs

@@ -18,9 +18,7 @@
 
 //! BEEFY Prometheus metrics definition
 
-#[cfg(not(test))]
-use prometheus::{register, PrometheusError, Registry};
-use prometheus::{Counter, Gauge, U64};
+use prometheus::{register, Counter, Gauge, PrometheusError, Registry, U64};
 
 /// BEEFY metrics exposed through Prometheus
 pub(crate) struct Metrics {
@@ -39,7 +37,6 @@ pub(crate) struct Metrics {
 }
 
 impl Metrics {
-	#[cfg(not(test))]
 	pub(crate) fn register(registry: &Registry) -> Result<Self, PrometheusError> {
 		Ok(Self {
 			beefy_validator_set_id: register(