Add mmr_root() to pallet-mmr API to expose root from state (companion for substrate#11183) (#5276)

* Add mmr_root() to pallet-mmr API to expose root from state

* use the right MmrApi primitives

* bridges: use correct mmr primitives

* rococo: beefy-mmr deposit mmr root digest

* fix lockfile

* update lockfile for {"substrate"}

Co-authored-by: parity-processbot <>

polkadot/runtime/kusama/src/lib.rs

@@ -62,10 +62,10 @@ use frame_support::{
 use frame_system::EnsureRoot;
 use pallet_grandpa::{fg_primitives, AuthorityId as GrandpaId};
 use pallet_im_online::sr25519::AuthorityId as ImOnlineId;
-use pallet_mmr_primitives as mmr;
 use pallet_session::historical as session_historical;
 use pallet_transaction_payment::{FeeDetails, RuntimeDispatchInfo};
 use sp_core::OpaqueMetadata;
+use sp_mmr_primitives as mmr;
 use sp_runtime::{
 	create_runtime_str, generic, impl_opaque_keys,
 	traits::{
@@ -1795,6 +1795,12 @@ sp_api::impl_runtime_apis! {
 			// dummy implementation due to lack of MMR pallet.
 			Err(mmr::Error::Verify)
 		}
+
+		fn mmr_root() -> Result<Hash, mmr::Error> {
+			// dummy implementation due to lack of MMR pallet.
+			Err(mmr::Error::Verify)
+		}
+
 	}
 
 	impl fg_primitives::GrandpaApi<Block> for Runtime {