Use changes tries in query_storage RPC (#1082)

* use changes tries in query_storage RPC

* let + match + return + call -> match

substrate/core/network/src/chain.rs

@@ -24,7 +24,7 @@ use runtime_primitives::traits::{Block as BlockT, Header as HeaderT, AuthorityId
 use runtime_primitives::generic::{BlockId};
 use consensus::{ImportBlock, ImportResult};
 use runtime_primitives::Justification;
-use primitives::{H256, Blake2Hasher};
+use primitives::{H256, Blake2Hasher, storage::StorageKey};
 
 /// Local client abstraction for the network.
 pub trait Client<Block: BlockT>: Send + Sync {
@@ -66,7 +66,7 @@ pub trait Client<Block: BlockT>: Send + Sync {
 		last: Block::Hash,
 		min: Block::Hash,
 		max: Block::Hash,
-		key: &[u8]
+		key: &StorageKey
 	) -> Result<ChangesProof<Block::Header>, Error>;
 }
 
@@ -125,7 +125,7 @@ impl<B, E, Block, RA> Client<Block> for SubstrateClient<B, E, Block, RA> where
 		last: Block::Hash,
 		min: Block::Hash,
 		max: Block::Hash,
-		key: &[u8]
+		key: &StorageKey
 	) -> Result<ChangesProof<Block::Header>, Error> {
 		(self as &SubstrateClient<B, E, Block, RA>).key_changes_proof(first, last, min, max, key)
 	}

substrate/core/network/src/protocol.rs

@@ -22,6 +22,7 @@ use parking_lot::RwLock;
 use rustc_hex::ToHex;
 use runtime_primitives::traits::{Block as BlockT, Header as HeaderT, NumberFor, As, Zero};
 use runtime_primitives::generic::BlockId;
+use primitives::storage::StorageKey;
 use network_libp2p::{NodeIndex, Severity};
 use codec::{Encode, Decode};
 use consensus::import_queue::ImportQueue;
@@ -712,11 +713,12 @@ impl<B: BlockT, S: NetworkSpecialization<B>, H: ExHashT> Protocol<B, S, H> {
 	fn on_remote_changes_request(&self, io: &mut SyncIo, who: NodeIndex, request: message::RemoteChangesRequest<B::Hash>) {
 		trace!(target: "sync", "Remote changes proof request {} from {} for key {} ({}..{})",
 			request.id, who, request.key.to_hex(), request.first, request.last);
-		let proof = match self.context_data.chain.key_changes_proof(request.first, request.last, request.min, request.max, &request.key) {
+		let key = StorageKey(request.key);
+		let proof = match self.context_data.chain.key_changes_proof(request.first, request.last, request.min, request.max, &key) {
 			Ok(proof) => proof,
 			Err(error) => {
 				trace!(target: "sync", "Remote changes proof request {} from {} for key {} ({}..{}) failed with: {}",
-					request.id, who, request.key.to_hex(), request.first, request.last, error);
+					request.id, who, key.0.to_hex(), request.first, request.last, error);
 				ChangesProof::<B::Header> {
 					max_block: Zero::zero(),
 					proof: vec![],