Apply some clippy lints

bin/node-template/node/src/rpc.rs

@@ -43,7 +43,7 @@ where
 
 	io.extend_with(SystemApi::to_delegate(FullSystem::new(client.clone(), pool, deny_unsafe)));
 
-	io.extend_with(TransactionPaymentApi::to_delegate(TransactionPayment::new(client.clone())));
+	io.extend_with(TransactionPaymentApi::to_delegate(TransactionPayment::new(client)));
 
 	// Extend this RPC with a custom API by using the following syntax.
 	// `YourRpcStruct` should have a reference to a client, which is needed

bin/node-template/node/src/service.rs

@@ -82,7 +82,7 @@ pub fn new_partial(
 
 	let (client, backend, keystore_container, task_manager) =
 		sc_service::new_full_parts::<Block, RuntimeApi, _>(
-			&config,
+			config,
 			telemetry.as_ref().map(|(_, telemetry)| telemetry.handle()),
 			executor,
 		)?;
@@ -263,7 +263,7 @@ pub fn new_full(mut config: Configuration) -> Result<TaskManager, ServiceError>
 		let aura = sc_consensus_aura::start_aura::<AuraPair, _, _, _, _, _, _, _, _, _, _, _>(
 			StartAuraParams {
 				slot_duration,
-				client: client.clone(),
+				client,
 				select_chain,
 				block_import,
 				proposer_factory,

bin/node-template/pallets/template/src/lib.rs

@@ -88,7 +88,7 @@ pub mod pallet {
 			// Read a value from storage.
 			match <Something<T>>::get() {
 				// Return an error if the value has not been set.
-				None => Err(Error::<T>::NoneValue)?,
+				None => return Err(Error::<T>::NoneValue.into()),
 				Some(old) => {
 					// Increment the value read from storage; will error in the event of overflow.
 					let new = old.checked_add(1).ok_or(Error::<T>::StorageOverflow)?;

bin/node-template/runtime/src/lib.rs

@@ -478,7 +478,7 @@ impl_runtime_apis! {
 
 			let storage_info = AllPalletsWithSystem::storage_info();
 
-			return (list, storage_info)
+			(list, storage_info)
 		}
 
 		fn dispatch_benchmark(

bin/node/bench/src/core.rs

@@ -132,7 +132,7 @@ pub fn run_benchmark(benchmark: Box<dyn BenchmarkDescription>, mode: Mode) -> Be
 		durations.push(duration.as_nanos());
 	}
 
-	durations.sort();
+	durations.sort_unstable();
 
 	let raw_average = (durations.iter().sum::<u128>() / (durations.len() as u128)) as u64;
 	let average = (durations.iter().skip(10).take(30).sum::<u128>() / 30) as u64;

bin/node/bench/src/main.rs

@@ -85,33 +85,22 @@ fn main() {
 
 	let mut import_benchmarks = Vec::new();
 
-	for profile in [Profile::Wasm, Profile::Native].iter() {
+	for profile in [Profile::Wasm, Profile::Native] {
 		for size in [
 			SizeType::Empty,
 			SizeType::Small,
 			SizeType::Medium,
 			SizeType::Large,
 			SizeType::Full,
 			SizeType::Custom(opt.transactions.unwrap_or(0)),
-		]
-		.iter()
-		{
+		] {
 			for block_type in [
 				BlockType::RandomTransfersKeepAlive,
 				BlockType::RandomTransfersReaping,
 				BlockType::Noop,
-			]
-			.iter()
-			{
-				for database_type in
-					[BenchDataBaseType::RocksDb, BenchDataBaseType::ParityDb].iter()
-				{
-					import_benchmarks.push((
-						profile,
-						size.clone(),
-						block_type.clone(),
-						database_type,
-					));
+			] {
+				for database_type in [BenchDataBaseType::RocksDb, BenchDataBaseType::ParityDb] {
+					import_benchmarks.push((profile, size, block_type, database_type));
 				}
 			}
 		}
@@ -120,11 +109,11 @@ fn main() {
 	let benchmarks = matrix!(
 		(profile, size, block_type, database_type) in import_benchmarks.into_iter() =>
 			ImportBenchmarkDescription {
-				profile: *profile,
+				profile,
 				key_types: KeyTypes::Sr25519,
-				size: size,
-				block_type: block_type,
-				database_type: *database_type,
+				size,
+				block_type,
+				database_type,
 			},
 		(size, db_type) in
 			[

bin/node/bench/src/state_sizes.rs

@@ -17,7 +17,7 @@
 // along with this program. If not, see <https://www.gnu.org/licenses/>.
 
 /// Kusama value size distribution
-pub const KUSAMA_STATE_DISTRIBUTION: &'static [(u32, u32)] = &[
+pub const KUSAMA_STATE_DISTRIBUTION: &[(u32, u32)] = &[
 	(32, 35),
 	(33, 20035),
 	(34, 5369),

bin/node/bench/src/trie.rs

@@ -282,7 +282,7 @@ impl core::Benchmark for TrieWriteBenchmark {
 		let mut db = self.database.clone();
 		let kvdb = db.open(self.database_type);
 
-		let mut new_root = self.root.clone();
+		let mut new_root = self.root;
 
 		let mut overlay = HashMap::new();
 		let mut trie = SimpleTrie { db: kvdb.clone(), overlay: &mut overlay };

bin/node/cli/src/service.rs

@@ -113,10 +113,10 @@ pub fn create_extrinsic(
 	let signature = raw_payload.using_encoded(|e| sender.sign(e));
 
 	node_runtime::UncheckedExtrinsic::new_signed(
-		function.clone(),
+		function,
 		sp_runtime::AccountId32::from(sender.public()).into(),
-		node_runtime::Signature::Sr25519(signature.clone()),
-		extra.clone(),
+		node_runtime::Signature::Sr25519(signature),
+		extra,
 	)
 }
 

bin/node/runtime/src/lib.rs

@@ -631,7 +631,7 @@ impl Get<Option<(usize, ExtendedBalance)>> for OffchainRandomBalancing {
 		use sp_runtime::traits::TrailingZeroInput;
 		let iters = match MINER_MAX_ITERATIONS {
 			0 => 0,
-			max @ _ => {
+			max => {
 				let seed = sp_io::offchain::random_seed();
 				let random = <u32>::decode(&mut TrailingZeroInput::new(&seed))
 					.expect("input is padded with zeroes; qed") %
@@ -1148,7 +1148,7 @@ where
 		let signature = raw_payload.using_encoded(|payload| C::sign(payload, public))?;
 		let address = Indices::unlookup(account);
 		let (call, extra, _) = raw_payload.deconstruct();
-		Some((call, (address, signature.into(), extra)))
+		Some((call, (address, signature, extra)))
 	}
 }
 
@@ -1911,7 +1911,7 @@ impl_runtime_apis! {
 
 			let storage_info = AllPalletsWithSystem::storage_info();
 
-			return (list, storage_info)
+			(list, storage_info)
 		}
 
 		fn dispatch_benchmark(

bin/node/testing/src/bench.rs

@@ -280,8 +280,7 @@ impl<'a> BlockContentIterator<'a> {
 		let genesis_hash = client
 			.block_hash(Zero::zero())
 			.expect("Database error?")
-			.expect("Genesis block always exists; qed")
-			.into();
+			.expect("Genesis block always exists; qed");
 
 		BlockContentIterator { iteration: 0, content, keyring, runtime_version, genesis_hash }
 	}
@@ -569,15 +568,13 @@ impl BenchKeyring {
 					genesis_hash,
 				);
 				let key = self.accounts.get(&signed).expect("Account id not found in keyring");
-				let signature = payload
-					.using_encoded(|b| {
-						if b.len() > 256 {
-							key.sign(&sp_io::hashing::blake2_256(b))
-						} else {
-							key.sign(b)
-						}
-					})
-					.into();
+				let signature = payload.using_encoded(|b| {
+					if b.len() > 256 {
+						key.sign(&sp_io::hashing::blake2_256(b))
+					} else {
+						key.sign(b)
+					}
+				});
 				UncheckedExtrinsic {
 					signature: Some((sp_runtime::MultiAddress::Id(signed), signature, extra)),
 					function: payload.0,

bin/utils/chain-spec-builder/src/main.rs

@@ -163,7 +163,7 @@ fn generate_chain_spec(
 }
 
 fn generate_authority_keys_and_store(seeds: &[String], keystore_path: &Path) -> Result<(), String> {
-	for (n, seed) in seeds.into_iter().enumerate() {
+	for (n, seed) in seeds.iter().enumerate() {
 		let keystore: SyncCryptoStorePtr = Arc::new(
 			LocalKeystore::open(keystore_path.join(format!("auth-{}", n)), None)
 				.map_err(|err| err.to_string())?,

client/allocator/src/freeing_bump.rs

@@ -90,7 +90,7 @@ fn error(msg: &'static str) -> Error {
 	Error::Other(msg)
 }
 
-const LOG_TARGET: &'static str = "wasm-heap";
+const LOG_TARGET: &str = "wasm-heap";
 
 // The minimum possible allocation size is chosen to be 8 bytes because in that case we would have
 // easier time to provide the guaranteed alignment of 8.

client/api/src/backend.rs

@@ -499,7 +499,7 @@ pub trait Backend<Block: BlockT>: AuxStore + Send + Sync {
 
 	/// Returns true if state for given block is available.
 	fn have_state_at(&self, hash: &Block::Hash, _number: NumberFor<Block>) -> bool {
-		self.state_at(BlockId::Hash(hash.clone())).is_ok()
+		self.state_at(BlockId::Hash(*hash)).is_ok()
 	}
 
 	/// Returns state backend with post-state of given block.

client/api/src/execution_extensions.rs

@@ -151,7 +151,7 @@ impl<Block: traits::Block> ExecutionExtensions<Block> {
 	where
 		T: OffchainSubmitTransaction<Block> + 'static,
 	{
-		*self.transaction_pool.write() = Some(Arc::downgrade(&pool) as _);
+		*self.transaction_pool.write() = Some(Arc::downgrade(pool) as _);
 	}
 
 	/// Based on the execution context and capabilities it produces

client/api/src/in_mem.rs

@@ -166,23 +166,19 @@ impl<Block: BlockT> Blockchain<Block> {
 		body: Option<Vec<<Block as BlockT>::Extrinsic>>,
 		new_state: NewBlockState,
 	) -> sp_blockchain::Result<()> {
-		let number = header.number().clone();
+		let number = *header.number();
 		if new_state.is_best() {
 			self.apply_head(&header)?;
 		}
 
 		{
 			let mut storage = self.storage.write();
-			storage
-				.leaves
-				.import(hash.clone(), number.clone(), header.parent_hash().clone());
-			storage
-				.blocks
-				.insert(hash.clone(), StoredBlock::new(header, body, justifications));
+			storage.leaves.import(hash, number, header.parent_hash().clone());
+			storage.blocks.insert(hash, StoredBlock::new(header, body, justifications));
 
 			if let NewBlockState::Final = new_state {
 				storage.finalized_hash = hash;
-				storage.finalized_number = number.clone();
+				storage.finalized_number = number;
 			}
 
 			if number == Zero::zero() {
@@ -266,9 +262,9 @@ impl<Block: BlockT> Blockchain<Block> {
 			}
 		}
 
-		storage.best_hash = hash.clone();
-		storage.best_number = number.clone();
-		storage.hashes.insert(number.clone(), hash.clone());
+		storage.best_hash = hash;
+		storage.best_number = *number;
+		storage.hashes.insert(*number, hash);
 
 		Ok(())
 	}
@@ -362,7 +358,7 @@ impl<Block: BlockT> HeaderBackend<Block> for Blockchain<Block> {
 			finalized_hash: storage.finalized_hash,
 			finalized_number: storage.finalized_number,
 			finalized_state: if storage.finalized_hash != Default::default() {
-				Some((storage.finalized_hash.clone(), storage.finalized_number))
+				Some((storage.finalized_hash, storage.finalized_number))
 			} else {
 				None
 			},
@@ -428,16 +424,12 @@ impl<Block: BlockT> blockchain::Backend<Block> for Blockchain<Block> {
 
 	fn justifications(&self, id: BlockId<Block>) -> sp_blockchain::Result<Option<Justifications>> {
 		Ok(self.id(id).and_then(|hash| {
-			self.storage
-				.read()
-				.blocks
-				.get(&hash)
-				.and_then(|b| b.justifications().map(|x| x.clone()))
+			self.storage.read().blocks.get(&hash).and_then(|b| b.justifications().cloned())
 		}))
 	}
 
 	fn last_finalized(&self) -> sp_blockchain::Result<Block::Hash> {
-		Ok(self.storage.read().finalized_hash.clone())
+		Ok(self.storage.read().finalized_hash)
 	}
 
 	fn leaves(&self) -> sp_blockchain::Result<Vec<Block::Hash>> {
@@ -810,15 +802,15 @@ impl<Block: BlockT> backend::LocalBackend<Block> for Backend<Block> where Block:
 /// Check that genesis storage is valid.
 pub fn check_genesis_storage(storage: &Storage) -> sp_blockchain::Result<()> {
 	if storage.top.iter().any(|(k, _)| well_known_keys::is_child_storage_key(k)) {
-		return Err(sp_blockchain::Error::InvalidState.into())
+		return Err(sp_blockchain::Error::InvalidState)
 	}
 
 	if storage
 		.children_default
 		.keys()
-		.any(|child_key| !well_known_keys::is_child_storage_key(&child_key))
+		.any(|child_key| !well_known_keys::is_child_storage_key(child_key))
 	{
-		return Err(sp_blockchain::Error::InvalidState.into())
+		return Err(sp_blockchain::Error::InvalidState)
 	}
 
 	Ok(())

client/api/src/lib.rs

@@ -57,10 +57,10 @@ pub mod utils {
 	/// represent the current block `hash` and its `parent hash`, if given the
 	/// function that's returned will assume that `hash` isn't part of the local DB
 	/// yet, and all searches in the DB will instead reference the parent.
-	pub fn is_descendent_of<'a, Block: BlockT, T>(
-		client: &'a T,
+	pub fn is_descendent_of<Block: BlockT, T>(
+		client: &T,
 		current: Option<(Block::Hash, Block::Hash)>,
-	) -> impl Fn(&Block::Hash, &Block::Hash) -> Result<bool, Error> + 'a
+	) -> impl Fn(&Block::Hash, &Block::Hash) -> Result<bool, Error> + '_
 	where
 		T: HeaderBackend<Block> + HeaderMetadata<Block, Error = Error>,
 	{

client/api/src/notifications.rs

@@ -71,10 +71,9 @@ type ChildKeys = Option<HashMap<StorageKey, Option<HashSet<StorageKey>>>>;
 
 impl StorageChangeSet {
 	/// Convert the change set into iterator over storage items.
-	pub fn iter<'a>(
-		&'a self,
-	) -> impl Iterator<Item = (Option<&'a StorageKey>, &'a StorageKey, Option<&'a StorageData>)> + 'a
-	{
+	pub fn iter(
+		&self,
+	) -> impl Iterator<Item = (Option<&StorageKey>, &StorageKey, Option<&StorageData>)> + '_ {
 		let top = self
 			.changes
 			.iter()