Fix deprecated trait objects without an explicit dyn (#11112)

accounts/ethstore/cli/src/main.rs

@@ -163,7 +163,7 @@ fn main() {
 	}
 }
 
-fn key_dir(location: &str, password: Option<Password>) -> Result<Box<KeyDirectory>, Error> {
+fn key_dir(location: &str, password: Option<Password>) -> Result<Box<dyn KeyDirectory>, Error> {
 	let dir: RootDiskDirectory = match location {
 		"geth" => RootDiskDirectory::create(dir::geth(false))?,
 		"geth-test" => RootDiskDirectory::create(dir::geth(true))?,

accounts/ethstore/src/ethstore.rs

@@ -709,7 +709,7 @@ mod tests {
 	}
 
 	struct RootDiskDirectoryGuard {
-		pub key_dir: Option<Box<KeyDirectory>>,
+		pub key_dir: Option<Box<dyn KeyDirectory>>,
 		_path: TempDir,
 	}
 

ethcore/wasm/run/src/runner.rs

@@ -115,7 +115,7 @@ impl fmt::Display for Fail {
 }
 
 pub fn construct(
-	ext: &mut vm::Ext,
+	ext: &mut dyn vm::Ext,
 	source: Vec<u8>,
 	arguments: Vec<u8>,
 	sender: H160,

miner/src/pool/replace.rs

@@ -133,7 +133,7 @@ mod tests {
 		verified_tx
 	}
 
-	fn should_replace(replace: &ShouldReplace<VerifiedTransaction>, old: VerifiedTransaction, new: VerifiedTransaction) -> Choice {
+	fn should_replace(replace: &dyn ShouldReplace<VerifiedTransaction>, old: VerifiedTransaction, new: VerifiedTransaction) -> Choice {
 		let old_tx = txpool::Transaction { insertion_id: 0, transaction: Arc::new(old) };
 		let new_tx = txpool::Transaction { insertion_id: 0, transaction: Arc::new(new) };
 		let old = ReplaceTransaction::new(&old_tx, Default::default());

parity-clib/src/lib.rs

@@ -243,7 +243,7 @@ pub unsafe extern fn parity_set_logger(
 }
 
 // WebSocket event loop
-fn parity_ws_worker(client: &RunningClient, query: &str, callback: Arc<Callback>) -> *const c_void {
+fn parity_ws_worker(client: &RunningClient, query: &str, callback: Arc<dyn Callback>) -> *const c_void {
 	let (tx, mut rx) = mpsc::channel(1);
 	let session = Arc::new(PubSubSession::new(tx));
 	let query_future = client.rpc_query(query, Some(session.clone()));
@@ -274,7 +274,7 @@ fn parity_ws_worker(client: &RunningClient, query: &str, callback: Arc<Callback>
 }
 
 // RPC event loop that runs for at most `timeout_ms`
-fn parity_rpc_worker(client: &RunningClient, query: &str, callback: Arc<Callback>, timeout_ms: u64) {
+fn parity_rpc_worker(client: &RunningClient, query: &str, callback: Arc<dyn Callback>, timeout_ms: u64) {
 	let cb = callback.clone();
 	let query = client.rpc_query(query, None).map(move |response| {
 		let response = response.unwrap_or_else(|| error::EMPTY.to_string());

secret-store/src/key_server.rs

@@ -37,13 +37,13 @@ pub struct KeyServerImpl {
 
 /// Secret store key server data.
 pub struct KeyServerCore {
-	cluster: Arc<ClusterClient>,
+	cluster: Arc<dyn ClusterClient>,
 }
 
 impl KeyServerImpl {
 	/// Create new key server instance
-	pub fn new(config: &ClusterConfiguration, key_server_set: Arc<KeyServerSet>, self_key_pair: Arc<NodeKeyPair>,
+	pub fn new(config: &ClusterConfiguration, key_server_set: Arc<dyn KeyServerSet>, self_key_pair: Arc<dyn NodeKeyPair>,
-		acl_storage: Arc<AclStorage>, key_storage: Arc<KeyStorage>, executor: Executor) -> Result<Self, Error>
+		acl_storage: Arc<dyn AclStorage>, key_storage: Arc<dyn KeyStorage>, executor: Executor) -> Result<Self, Error>
 	{
 		Ok(KeyServerImpl {
 			data: Arc::new(Mutex::new(KeyServerCore::new(config, key_server_set, self_key_pair, acl_storage, key_storage, executor)?)),
@@ -51,7 +51,7 @@ impl KeyServerImpl {
 	}
 
 	/// Get cluster client reference.
-	pub fn cluster(&self) -> Arc<ClusterClient> {
+	pub fn cluster(&self) -> Arc<dyn ClusterClient> {
 		self.data.lock().cluster.clone()
 	}
 }
@@ -64,7 +64,7 @@ impl AdminSessionsServer for KeyServerImpl {
 		old_set_signature: RequestSignature,
 		new_set_signature: RequestSignature,
 		new_servers_set: BTreeSet<NodeId>,
-	) -> Box<Future<Item=(), Error=Error> + Send> {
+	) -> Box<dyn Future<Item=(), Error=Error> + Send> {
 		return_session(self.data.lock().cluster
 			.new_servers_set_change_session(None, None, new_servers_set, old_set_signature, new_set_signature))
 	}
@@ -76,7 +76,7 @@ impl ServerKeyGenerator for KeyServerImpl {
 		key_id: ServerKeyId,
 		author: Requester,
 		threshold: usize,
-	) -> Box<Future<Item=Public, Error=Error> + Send> {
+	) -> Box<dyn Future<Item=Public, Error=Error> + Send> {
 		// recover requestor' address key from signature
 		let address = author.address(&key_id).map_err(Error::InsufficientRequesterData);
 
@@ -89,7 +89,7 @@ impl ServerKeyGenerator for KeyServerImpl {
 		&self,
 		key_id: ServerKeyId,
 		author: Requester,
-	) -> Box<Future<Item=Public, Error=Error> + Send> {
+	) -> Box<dyn Future<Item=Public, Error=Error> + Send> {
 		// recover requestor' public key from signature
 		let session_and_address = author
 			.address(&key_id)
@@ -121,7 +121,7 @@ impl DocumentKeyServer for KeyServerImpl {
 		author: Requester,
 		common_point: Public,
 		encrypted_document_key: Public,
-	) -> Box<Future<Item=(), Error=Error> + Send> {
+	) -> Box<dyn Future<Item=(), Error=Error> + Send> {
 		// store encrypted key
 		return_session(self.data.lock().cluster.new_encryption_session(key_id,
 			author.clone(), common_point, encrypted_document_key))
@@ -132,7 +132,7 @@ impl DocumentKeyServer for KeyServerImpl {
 		key_id: ServerKeyId,
 		author: Requester,
 		threshold: usize,
-	) -> Box<Future<Item=EncryptedDocumentKey, Error=Error> + Send> {
+	) -> Box<dyn Future<Item=EncryptedDocumentKey, Error=Error> + Send> {
 		// recover requestor' public key from signature
 		let public = result(author.public(&key_id).map_err(Error::InsufficientRequesterData));
 
@@ -174,7 +174,7 @@ impl DocumentKeyServer for KeyServerImpl {
 		&self,
 		key_id: ServerKeyId,
 		requester: Requester,
-	) -> Box<Future<Item=EncryptedDocumentKey, Error=Error> + Send> {
+	) -> Box<dyn Future<Item=EncryptedDocumentKey, Error=Error> + Send> {
 		// recover requestor' public key from signature
 		let public = result(requester.public(&key_id).map_err(Error::InsufficientRequesterData));
 
@@ -200,7 +200,7 @@ impl DocumentKeyServer for KeyServerImpl {
 		&self,
 		key_id: ServerKeyId,
 		requester: Requester,
-	) -> Box<Future<Item=EncryptedDocumentKeyShadow, Error=Error> + Send> {
+	) -> Box<dyn Future<Item=EncryptedDocumentKeyShadow, Error=Error> + Send> {
 		return_session(self.data.lock().cluster.new_decryption_session(key_id,
 			None, requester.clone(), None, true, false))
 	}
@@ -212,7 +212,7 @@ impl MessageSigner for KeyServerImpl {
 		key_id: ServerKeyId,
 		requester: Requester,
 		message: MessageHash,
-	) -> Box<Future<Item=EncryptedMessageSignature, Error=Error> + Send> {
+	) -> Box<dyn Future<Item=EncryptedMessageSignature, Error=Error> + Send> {
 		// recover requestor' public key from signature
 		let public = result(requester.public(&key_id).map_err(Error::InsufficientRequesterData));
 
@@ -246,7 +246,7 @@ impl MessageSigner for KeyServerImpl {
 		key_id: ServerKeyId,
 		requester: Requester,
 		message: MessageHash,
-	) -> Box<Future<Item=EncryptedMessageSignature, Error=Error> + Send> {
+	) -> Box<dyn Future<Item=EncryptedMessageSignature, Error=Error> + Send> {
 		// recover requestor' public key from signature
 		let public = result(requester.public(&key_id).map_err(Error::InsufficientRequesterData));
 
@@ -269,8 +269,8 @@ impl MessageSigner for KeyServerImpl {
 }
 
 impl KeyServerCore {
-	pub fn new(config: &ClusterConfiguration, key_server_set: Arc<KeyServerSet>, self_key_pair: Arc<NodeKeyPair>,
+	pub fn new(config: &ClusterConfiguration, key_server_set: Arc<dyn KeyServerSet>, self_key_pair: Arc<dyn NodeKeyPair>,
-		acl_storage: Arc<AclStorage>, key_storage: Arc<KeyStorage>, executor: Executor) -> Result<Self, Error>
+		acl_storage: Arc<dyn AclStorage>, key_storage: Arc<dyn KeyStorage>, executor: Executor) -> Result<Self, Error>
 	{
 		let cconfig = NetClusterConfiguration {
 			self_key_pair: self_key_pair.clone(),
@@ -298,7 +298,7 @@ impl KeyServerCore {
 
 fn return_session<S: ClusterSession>(
 	session: Result<WaitableSession<S>, Error>,
-) -> Box<Future<Item=S::SuccessfulResult, Error=Error> + Send> {
+) -> Box<dyn Future<Item=S::SuccessfulResult, Error=Error> + Send> {
 	match session {
 		Ok(session) => Box::new(session.into_wait_future()),
 		Err(error) => Box::new(err(error))
@@ -340,7 +340,7 @@ pub mod tests {
 			_old_set_signature: RequestSignature,
 			_new_set_signature: RequestSignature,
 			_new_servers_set: BTreeSet<NodeId>,
-		) -> Box<Future<Item=(), Error=Error> + Send> {
+		) -> Box<dyn Future<Item=(), Error=Error> + Send> {
 			unimplemented!("test-only")
 		}
 	}
@@ -351,7 +351,7 @@ pub mod tests {
 			_key_id: ServerKeyId,
 			_author: Requester,
 			_threshold: usize,
-		) -> Box<Future<Item=Public, Error=Error> + Send> {
+		) -> Box<dyn Future<Item=Public, Error=Error> + Send> {
 			unimplemented!("test-only")
 		}
 
@@ -359,7 +359,7 @@ pub mod tests {
 			&self,
 			_key_id: ServerKeyId,
 			_author: Requester,
-		) -> Box<Future<Item=Public, Error=Error> + Send> {
+		) -> Box<dyn Future<Item=Public, Error=Error> + Send> {
 			unimplemented!("test-only")
 		}
 	}
@@ -371,7 +371,7 @@ pub mod tests {
 			_author: Requester,
 			_common_point: Public,
 			_encrypted_document_key: Public,
-		) -> Box<Future<Item=(), Error=Error> + Send> {
+		) -> Box<dyn Future<Item=(), Error=Error> + Send> {
 			unimplemented!("test-only")
 		}
 
@@ -380,7 +380,7 @@ pub mod tests {
 			_key_id: ServerKeyId,
 			_author: Requester,
 			_threshold: usize,
-		) -> Box<Future<Item=EncryptedDocumentKey, Error=Error> + Send> {
+		) -> Box<dyn Future<Item=EncryptedDocumentKey, Error=Error> + Send> {
 			unimplemented!("test-only")
 		}
 
@@ -388,7 +388,7 @@ pub mod tests {
 			&self,
 			_key_id: ServerKeyId,
 			_requester: Requester,
-		) -> Box<Future<Item=EncryptedDocumentKey, Error=Error> + Send> {
+		) -> Box<dyn Future<Item=EncryptedDocumentKey, Error=Error> + Send> {
 			unimplemented!("test-only")
 		}
 
@@ -396,7 +396,7 @@ pub mod tests {
 			&self,
 			_key_id: ServerKeyId,
 			_requester: Requester,
-		) -> Box<Future<Item=EncryptedDocumentKeyShadow, Error=Error> + Send> {
+		) -> Box<dyn Future<Item=EncryptedDocumentKeyShadow, Error=Error> + Send> {
 			unimplemented!("test-only")
 		}
 	}
@@ -407,7 +407,7 @@ pub mod tests {
 			_key_id: ServerKeyId,
 			_requester: Requester,
 			_message: MessageHash,
-		) -> Box<Future<Item=EncryptedMessageSignature, Error=Error> + Send> {
+		) -> Box<dyn Future<Item=EncryptedMessageSignature, Error=Error> + Send> {
 			unimplemented!("test-only")
 		}
 
@@ -416,7 +416,7 @@ pub mod tests {
 			_key_id: ServerKeyId,
 			_requester: Requester,
 			_message: MessageHash,
-		) -> Box<Future<Item=EncryptedMessageSignature, Error=Error> + Send> {
+		) -> Box<dyn Future<Item=EncryptedMessageSignature, Error=Error> + Send> {
 			unimplemented!("test-only")
 		}
 	}

secret-store/src/key_server_cluster/admin_sessions/key_version_negotiation_session.rs

@@ -83,7 +83,7 @@ struct SessionCore<T: SessionTransport> {
 	/// Key share.
 	pub key_share: Option<DocumentKeyShare>,
 	/// Session result computer.
-	pub result_computer: Arc<SessionResultComputer>,
+	pub result_computer: Arc<dyn SessionResultComputer>,
 	/// Session transport.
 	pub transport: T,
 	/// Session nonce.
@@ -119,7 +119,7 @@ pub struct SessionParams<T: SessionTransport> {
 	/// Key share.
 	pub key_share: Option<DocumentKeyShare>,
 	/// Session result computer.
-	pub result_computer: Arc<SessionResultComputer>,
+	pub result_computer: Arc<dyn SessionResultComputer>,
 	/// Session transport to communicate to other cluster nodes.
 	pub transport: T,
 	/// Session nonce.
@@ -140,7 +140,7 @@ enum SessionState {
 /// Isolated session transport.
 pub struct IsolatedSessionTransport {
 	/// Cluster.
-	pub cluster: Arc<Cluster>,
+	pub cluster: Arc<dyn Cluster>,
 	/// Key id.
 	pub key_id: SessionId,
 	/// Sub session id.
@@ -859,7 +859,7 @@ mod tests {
 				versions: vec![version_id.clone().into()]
 			})), Err(Error::InvalidMessage));
 		}
-		
+
 		run_test(CommonKeyData {
 			threshold: 2,
 			author: Default::default(),

secret-store/src/key_server_cluster/admin_sessions/servers_set_change_session.rs

@@ -83,9 +83,9 @@ struct SessionCore {
 	/// Servers set change session meta (id is computed from new_nodes_set).
 	pub meta: ShareChangeSessionMeta,
 	/// Cluster which allows this node to send messages to other nodes in the cluster.
-	pub cluster: Arc<Cluster>,
+	pub cluster: Arc<dyn Cluster>,
 	/// Keys storage.
-	pub key_storage: Arc<KeyStorage>,
+	pub key_storage: Arc<dyn KeyStorage>,
 	/// Session-level nonce.
 	pub nonce: u64,
 	/// All known nodes.
@@ -136,9 +136,9 @@ pub struct SessionParams {
 	/// Session meta (artificial).
 	pub meta: ShareChangeSessionMeta,
 	/// Cluster.
-	pub cluster: Arc<Cluster>,
+	pub cluster: Arc<dyn Cluster>,
 	/// Keys storage.
-	pub key_storage: Arc<KeyStorage>,
+	pub key_storage: Arc<dyn KeyStorage>,
 	/// Session nonce.
 	pub nonce: u64,
 	/// All known nodes.
@@ -158,7 +158,7 @@ struct ServersSetChangeConsensusTransport {
 	/// Migration id (if part of auto-migration process).
 	migration_id: Option<H256>,
 	/// Cluster.
-	cluster: Arc<Cluster>,
+	cluster: Arc<dyn Cluster>,
 }
 
 /// Unknown sessions job transport.
@@ -168,7 +168,7 @@ struct UnknownSessionsJobTransport {
 	/// Session-level nonce.
 	nonce: u64,
 	/// Cluster.
-	cluster: Arc<Cluster>,
+	cluster: Arc<dyn Cluster>,
 }
 
 /// Key version negotiation transport.
@@ -178,7 +178,7 @@ struct ServersSetChangeKeyVersionNegotiationTransport {
 	/// Session-level nonce.
 	nonce: u64,
 	/// Cluster.
-	cluster: Arc<Cluster>,
+	cluster: Arc<dyn Cluster>,
 }
 
 impl SessionImpl {
@@ -292,7 +292,7 @@ impl SessionImpl {
 				self.on_session_error(sender, message.error.clone());
 				Ok(())
 			},
-			&ServersSetChangeMessage::ServersSetChangeCompleted(ref message) => 
+			&ServersSetChangeMessage::ServersSetChangeCompleted(ref message) =>
 				self.on_session_completed(sender, message),
 		}
 	}
@@ -893,7 +893,7 @@ impl SessionImpl {
 	/// Complete servers set change session.
 	fn complete_session(core: &SessionCore, data: &mut SessionData) -> Result<(), Error> {
 		debug_assert_eq!(core.meta.self_node_id, core.meta.master_node_id);
-		
+
 		// send completion notification
 		core.cluster.broadcast(Message::ServersSetChange(ServersSetChangeMessage::ServersSetChangeCompleted(ServersSetChangeCompleted {
 			session: core.meta.id.clone().into(),

secret-store/src/key_server_cluster/admin_sessions/sessions_queue.rs

@@ -28,7 +28,7 @@ pub struct SessionsQueue {
 
 impl SessionsQueue {
 	/// Create new sessions queue.
-	pub fn new(key_storage: &Arc<KeyStorage>, unknown_sessions: BTreeSet<SessionId>) -> Self {
+	pub fn new(key_storage: &Arc<dyn KeyStorage>, unknown_sessions: BTreeSet<SessionId>) -> Self {
 		// TODO [Opt]:
 		// 1) known sessions - change to iter
 		// 2) unknown sesions - request chunk-by-chunk

secret-store/src/key_server_cluster/admin_sessions/share_add_session.rs

@@ -69,7 +69,7 @@ struct SessionCore<T: SessionTransport> {
 	/// Session transport to communicate to other cluster nodes.
 	pub transport: T,
 	/// Key storage.
-	pub key_storage: Arc<KeyStorage>,
+	pub key_storage: Arc<dyn KeyStorage>,
 	/// Administrator public key.
 	pub admin_public: Option<Public>,
 	/// Session completion signal.
@@ -131,7 +131,7 @@ pub struct SessionParams<T: SessionTransport> {
 	/// Session transport.
 	pub transport: T,
 	/// Key storage.
-	pub key_storage: Arc<KeyStorage>,
+	pub key_storage: Arc<dyn KeyStorage>,
 	/// Administrator public key.
 	pub admin_public: Option<Public>,
 	/// Session nonce.
@@ -154,7 +154,7 @@ pub struct IsolatedSessionTransport {
 	/// Id numbers of all new nodes.
 	id_numbers: Option<BTreeMap<NodeId, Option<Secret>>>,
 	/// Cluster.
-	cluster: Arc<Cluster>,
+	cluster: Arc<dyn Cluster>,
 }
 
 impl<T> SessionImpl<T> where T: SessionTransport {
@@ -817,7 +817,7 @@ impl<T> ClusterSession for SessionImpl<T> where T: SessionTransport {
 }
 
 impl IsolatedSessionTransport {
-	pub fn new(session_id: SessionId, version: Option<H256>, nonce: u64, cluster: Arc<Cluster>) -> Self {
+	pub fn new(session_id: SessionId, version: Option<H256>, nonce: u64, cluster: Arc<dyn Cluster>) -> Self {
 		IsolatedSessionTransport {
 			session: session_id,
 			version: version,

secret-store/src/key_server_cluster/admin_sessions/share_change_session.rs

@@ -43,9 +43,9 @@ pub struct ShareChangeSession {
 	/// Share change session meta.
 	meta: ShareChangeSessionMeta,
 	/// Cluster.
-	cluster: Arc<Cluster>,
+	cluster: Arc<dyn Cluster>,
 	/// Key storage.
-	key_storage: Arc<KeyStorage>,
+	key_storage: Arc<dyn KeyStorage>,
 	/// Key version.
 	key_version: H256,
 	/// Nodes that have reported version ownership.
@@ -82,9 +82,9 @@ pub struct ShareChangeSessionParams {
 	/// Share change session meta.
 	pub meta: ShareChangeSessionMeta,
 	/// Cluster.
-	pub cluster: Arc<Cluster>,
+	pub cluster: Arc<dyn Cluster>,
 	/// Keys storage.
-	pub key_storage: Arc<KeyStorage>,
+	pub key_storage: Arc<dyn KeyStorage>,
 	/// Session plan.
 	pub plan: ShareChangeSessionPlan,
 }
@@ -97,7 +97,7 @@ pub struct ShareChangeTransport {
 	/// Session nonce.
 	nonce: u64,
 	/// Cluster.
-	cluster: Arc<Cluster>,
+	cluster: Arc<dyn Cluster>,
 }
 
 impl ShareChangeSession {
@@ -201,7 +201,7 @@ impl ShareChangeSession {
 }
 
 impl ShareChangeTransport {
-	pub fn new(session_id: SessionId, nonce: u64, cluster: Arc<Cluster>) -> Self {
+	pub fn new(session_id: SessionId, nonce: u64, cluster: Arc<dyn Cluster>) -> Self {
 		ShareChangeTransport {
 			session_id: session_id,
 			nonce: nonce,

secret-store/src/key_server_cluster/client_sessions/decryption_session.rs

@@ -56,7 +56,7 @@ struct SessionCore {
 	/// Key share.
 	pub key_share: Option<DocumentKeyShare>,
 	/// Cluster which allows this node to send messages to other nodes in the cluster.
-	pub cluster: Arc<Cluster>,
+	pub cluster: Arc<dyn Cluster>,
 	/// Session-level nonce.
 	pub nonce: u64,
 	/// Session completion signal.
@@ -98,9 +98,9 @@ pub struct SessionParams {
 	/// Key share.
 	pub key_share: Option<DocumentKeyShare>,
 	/// ACL storage.
-	pub acl_storage: Arc<AclStorage>,
+	pub acl_storage: Arc<dyn AclStorage>,
 	/// Cluster.
-	pub cluster: Arc<Cluster>,
+	pub cluster: Arc<dyn Cluster>,
 	/// Session nonce.
 	pub nonce: u64,
 }
@@ -118,7 +118,7 @@ struct DecryptionConsensusTransport {
 	/// Selected key version (on master node).
 	version: Option<H256>,
 	/// Cluster.
-	cluster: Arc<Cluster>,
+	cluster: Arc<dyn Cluster>,
 }
 
 /// Decryption job transport
@@ -134,7 +134,7 @@ struct DecryptionJobTransport {
 	/// Master node id.
 	master_node_id: NodeId,
 	/// Cluster.
-	cluster: Arc<Cluster>,
+	cluster: Arc<dyn Cluster>,
 }
 
 /// Session delegation status.

secret-store/src/key_server_cluster/client_sessions/encryption_session.rs

@@ -44,9 +44,9 @@ pub struct SessionImpl {
 	/// Encrypted data.
 	encrypted_data: Option<DocumentKeyShare>,
 	/// Key storage.
-	key_storage: Arc<KeyStorage>,
+	key_storage: Arc<dyn KeyStorage>,
 	/// Cluster which allows this node to send messages to other nodes in the cluster.
-	cluster: Arc<Cluster>,
+	cluster: Arc<dyn Cluster>,
 	/// Session nonce.
 	nonce: u64,
 	/// Session completion signal.
@@ -64,9 +64,9 @@ pub struct SessionParams {
 	/// Encrypted data (result of running generation_session::SessionImpl).
 	pub encrypted_data: Option<DocumentKeyShare>,
 	/// Key storage.
-	pub key_storage: Arc<KeyStorage>,
+	pub key_storage: Arc<dyn KeyStorage>,
 	/// Cluster
-	pub cluster: Arc<Cluster>,
+	pub cluster: Arc<dyn Cluster>,
 	/// Session nonce.
 	pub nonce: u64,
 }
@@ -331,7 +331,7 @@ pub fn check_encrypted_data(key_share: Option<&DocumentKeyShare>) -> Result<(),
 }
 
 /// Update key share with encrypted document key.
-pub fn update_encrypted_data(key_storage: &Arc<KeyStorage>, key_id: ServerKeyId, mut key_share: DocumentKeyShare, author: Address, common_point: Public, encrypted_point: Public) -> Result<(), Error> {
+pub fn update_encrypted_data(key_storage: &Arc<dyn KeyStorage>, key_id: ServerKeyId, mut key_share: DocumentKeyShare, author: Address, common_point: Public, encrypted_point: Public) -> Result<(), Error> {
 	// author must be the same
 	if key_share.author != author {
 		return Err(Error::AccessDenied);

secret-store/src/key_server_cluster/client_sessions/generation_session.rs

@@ -42,9 +42,9 @@ pub struct SessionImpl {
 	/// Public identifier of this node.
 	self_node_id: NodeId,
 	/// Key storage.
-	key_storage: Option<Arc<KeyStorage>>,
+	key_storage: Option<Arc<dyn KeyStorage>>,
 	/// Cluster which allows this node to send messages to other nodes in the cluster.
-	cluster: Arc<Cluster>,
+	cluster: Arc<dyn Cluster>,
 	/// Session-level nonce.
 	nonce: u64,
 	/// Mutable session data.
@@ -60,9 +60,9 @@ pub struct SessionParams {
 	/// Id of node, on which this session is running.
 	pub self_node_id: Public,
 	/// Key storage.
-	pub key_storage: Option<Arc<KeyStorage>>,
+	pub key_storage: Option<Arc<dyn KeyStorage>>,
 	/// Cluster
-	pub cluster: Arc<Cluster>,
+	pub cluster: Arc<dyn Cluster>,
 	/// Session nonce.
 	pub nonce: Option<u64>,
 }

secret-store/src/key_server_cluster/client_sessions/signing_session_ecdsa.rs

@@ -56,7 +56,7 @@ struct SessionCore {
 	/// Key share.
 	pub key_share: Option<DocumentKeyShare>,
 	/// Cluster which allows this node to send messages to other nodes in the cluster.
-	pub cluster: Arc<Cluster>,
+	pub cluster: Arc<dyn Cluster>,
 	/// Session-level nonce.
 	pub nonce: u64,
 	/// Session completion signal.
@@ -112,9 +112,9 @@ pub struct SessionParams {
 	/// Key share.
 	pub key_share: Option<DocumentKeyShare>,
 	/// ACL storage.
-	pub acl_storage: Arc<AclStorage>,
+	pub acl_storage: Arc<dyn AclStorage>,
 	/// Cluster
-	pub cluster: Arc<Cluster>,
+	pub cluster: Arc<dyn Cluster>,
 	/// Session nonce.
 	pub nonce: u64,
 }
@@ -130,7 +130,7 @@ struct SigningConsensusTransport {
 	/// Selected key version (on master node).
 	version: Option<H256>,
 	/// Cluster.
-	cluster: Arc<Cluster>,
+	cluster: Arc<dyn Cluster>,
 }
 
 /// Signing key generation transport.
@@ -142,7 +142,7 @@ struct NonceGenerationTransport<F: Fn(SessionId, Secret, u64, GenerationMessage)
 	/// Session-level nonce.
 	nonce: u64,
 	/// Cluster.
-	cluster: Arc<Cluster>,
+	cluster: Arc<dyn Cluster>,
 	/// Other nodes ids.
 	other_nodes_ids: BTreeSet<NodeId>,
 	/// Message mapping function.
@@ -158,7 +158,7 @@ struct SigningJobTransport {
 	/// Session-level nonce.
 	nonce: u64,
 	/// Cluster.
-	cluster: Arc<Cluster>,
+	cluster: Arc<dyn Cluster>,
 }
 
 /// Session delegation status.

secret-store/src/key_server_cluster/client_sessions/signing_session_schnorr.rs

@@ -57,7 +57,7 @@ struct SessionCore {
 	/// Key share.
 	pub key_share: Option<DocumentKeyShare>,
 	/// Cluster which allows this node to send messages to other nodes in the cluster.
-	pub cluster: Arc<Cluster>,
+	pub cluster: Arc<dyn Cluster>,
 	/// Session-level nonce.
 	pub nonce: u64,
 	/// SessionImpl completion signal.
@@ -106,9 +106,9 @@ pub struct SessionParams {
 	/// Key share.
 	pub key_share: Option<DocumentKeyShare>,
 	/// ACL storage.
-	pub acl_storage: Arc<AclStorage>,
+	pub acl_storage: Arc<dyn AclStorage>,
 	/// Cluster
-	pub cluster: Arc<Cluster>,
+	pub cluster: Arc<dyn Cluster>,
 	/// Session nonce.
 	pub nonce: u64,
 }
@@ -124,7 +124,7 @@ struct SigningConsensusTransport {
 	/// Selected key version (on master node).
 	version: Option<H256>,
 	/// Cluster.
-	cluster: Arc<Cluster>,
+	cluster: Arc<dyn Cluster>,
 }
 
 /// Signing key generation transport.
@@ -132,7 +132,7 @@ struct SessionKeyGenerationTransport {
 	/// Session access key.
 	access_key: Secret,
 	/// Cluster.
-	cluster: Arc<Cluster>,
+	cluster: Arc<dyn Cluster>,
 	/// Session-level nonce.
 	nonce: u64,
 	/// Other nodes ids.
@@ -148,7 +148,7 @@ struct SigningJobTransport {
 	/// Session-level nonce.
 	nonce: u64,
 	/// Cluster.
-	cluster: Arc<Cluster>,
+	cluster: Arc<dyn Cluster>,
 }
 
 /// Session delegation status.

secret-store/src/key_server_cluster/cluster.rs

@@ -104,11 +104,11 @@ pub trait ClusterClient: Send + Sync {
 	) -> Result<WaitableSession<AdminSession>, Error>;
 
 	/// Listen for new generation sessions.
-	fn add_generation_listener(&self, listener: Arc<ClusterSessionsListener<GenerationSession>>);
+	fn add_generation_listener(&self, listener: Arc<dyn ClusterSessionsListener<GenerationSession>>);
 	/// Listen for new decryption sessions.
-	fn add_decryption_listener(&self, listener: Arc<ClusterSessionsListener<DecryptionSession>>);
+	fn add_decryption_listener(&self, listener: Arc<dyn ClusterSessionsListener<DecryptionSession>>);
 	/// Listen for new key version negotiation sessions.
-	fn add_key_version_negotiation_listener(&self, listener: Arc<ClusterSessionsListener<KeyVersionNegotiationSession<KeyVersionNegotiationSessionTransport>>>);
+	fn add_key_version_negotiation_listener(&self, listener: Arc<dyn ClusterSessionsListener<KeyVersionNegotiationSession<KeyVersionNegotiationSessionTransport>>>);
 
 	/// Ask node to make 'faulty' generation sessions.
 	#[cfg(test)]
@@ -143,13 +143,13 @@ pub trait Cluster: Send + Sync {
 #[derive(Clone)]
 pub struct ClusterConfiguration {
 	/// KeyPair this node holds.
-	pub self_key_pair: Arc<NodeKeyPair>,
+	pub self_key_pair: Arc<dyn NodeKeyPair>,
 	/// Cluster nodes set.
-	pub key_server_set: Arc<KeyServerSet>,
+	pub key_server_set: Arc<dyn KeyServerSet>,
 	/// Reference to key storage
-	pub key_storage: Arc<KeyStorage>,
+	pub key_storage: Arc<dyn KeyStorage>,
 	/// Reference to ACL storage
-	pub acl_storage: Arc<AclStorage>,
+	pub acl_storage: Arc<dyn AclStorage>,
 	/// Administrator public key.
 	pub admin_public: Option<Public>,
 	/// Do not remove sessions from container.
@@ -172,8 +172,8 @@ pub struct ClusterClientImpl<C: ConnectionManager> {
 pub struct ClusterView {
 	configured_nodes_count: usize,
 	connected_nodes: BTreeSet<NodeId>,
-	connections: Arc<ConnectionProvider>,
+	connections: Arc<dyn ConnectionProvider>,
-	self_key_pair: Arc<NodeKeyPair>,
+	self_key_pair: Arc<dyn NodeKeyPair>,
 }
 
 /// Cross-thread shareable cluster data.
@@ -181,15 +181,15 @@ pub struct ClusterData<C: ConnectionManager> {
 	/// Cluster configuration.
 	pub config: ClusterConfiguration,
 	/// KeyPair this node holds.
-	pub self_key_pair: Arc<NodeKeyPair>,
+	pub self_key_pair: Arc<dyn NodeKeyPair>,
 	/// Connections data.
 	pub connections: C,
 	/// Active sessions data.
 	pub sessions: Arc<ClusterSessions>,
 	// Messages processor.
-	pub message_processor: Arc<MessageProcessor>,
+	pub message_processor: Arc<dyn MessageProcessor>,
 	/// Link between servers set chnage session and the connections manager.
-	pub servers_set_change_creator_connector: Arc<ServersSetChangeSessionCreatorConnector>,
+	pub servers_set_change_creator_connector: Arc<dyn ServersSetChangeSessionCreatorConnector>,
 }
 
 /// Create new network-backed cluster.
@@ -206,7 +206,7 @@ pub fn new_network_cluster(
 		connections: BTreeMap::new(),
 	}));
 
-	let connection_trigger: Box<ConnectionTrigger> = match net_config.auto_migrate_enabled {
+	let connection_trigger: Box<dyn ConnectionTrigger> = match net_config.auto_migrate_enabled {
 		false => Box::new(SimpleConnectionTrigger::with_config(&config)),
 		true if config.admin_public.is_none() => Box::new(ConnectionTriggerWithMigration::with_config(&config)),
 		true => return Err(Error::Internal(
@@ -264,9 +264,9 @@ pub fn new_test_cluster(
 impl<C: ConnectionManager> ClusterCore<C> {
 	pub fn new(
 		sessions: Arc<ClusterSessions>,
-		message_processor: Arc<MessageProcessor>,
+		message_processor: Arc<dyn MessageProcessor>,
 		connections: C,
-		servers_set_change_creator_connector: Arc<ServersSetChangeSessionCreatorConnector>,
+		servers_set_change_creator_connector: Arc<dyn ServersSetChangeSessionCreatorConnector>,
 		config: ClusterConfiguration,
 	) -> Result<Arc<Self>, Error> {
 		Ok(Arc::new(ClusterCore {
@@ -282,7 +282,7 @@ impl<C: ConnectionManager> ClusterCore<C> {
 	}
 
 	/// Create new client interface.
-	pub fn client(&self) -> Arc<ClusterClient> {
+	pub fn client(&self) -> Arc<dyn ClusterClient> {
 		Arc::new(ClusterClientImpl::new(self.data.clone()))
 	}
 
@@ -293,7 +293,7 @@ impl<C: ConnectionManager> ClusterCore<C> {
 	}
 
 	#[cfg(test)]
-	pub fn view(&self) -> Result<Arc<Cluster>, Error> {
+	pub fn view(&self) -> Result<Arc<dyn Cluster>, Error> {
 		let connections = self.data.connections.provider();
 		let mut connected_nodes = connections.connected_nodes()?;
 		let disconnected_nodes = connections.disconnected_nodes();
@@ -311,8 +311,8 @@ impl<C: ConnectionManager> ClusterCore<C> {
 
 impl ClusterView {
 	pub fn new(
-		self_key_pair: Arc<NodeKeyPair>,
+		self_key_pair: Arc<dyn NodeKeyPair>,
-		connections: Arc<ConnectionProvider>,
+		connections: Arc<dyn ConnectionProvider>,
 		nodes: BTreeSet<NodeId>,
 		configured_nodes_count: usize
 	) -> Self {
@@ -555,15 +555,15 @@ impl<C: ConnectionManager> ClusterClient for ClusterClientImpl<C> {
 			})
 	}
 
-	fn add_generation_listener(&self, listener: Arc<ClusterSessionsListener<GenerationSession>>) {
+	fn add_generation_listener(&self, listener: Arc<dyn ClusterSessionsListener<GenerationSession>>) {
 		self.data.sessions.generation_sessions.add_listener(listener);
 	}
 
-	fn add_decryption_listener(&self, listener: Arc<ClusterSessionsListener<DecryptionSession>>) {
+	fn add_decryption_listener(&self, listener: Arc<dyn ClusterSessionsListener<DecryptionSession>>) {
 		self.data.sessions.decryption_sessions.add_listener(listener);
 	}
 
-	fn add_key_version_negotiation_listener(&self, listener: Arc<ClusterSessionsListener<KeyVersionNegotiationSession<KeyVersionNegotiationSessionTransport>>>) {
+	fn add_key_version_negotiation_listener(&self, listener: Arc<dyn ClusterSessionsListener<KeyVersionNegotiationSession<KeyVersionNegotiationSessionTransport>>>) {
 		self.data.sessions.negotiation_sessions.add_listener(listener);
 	}
 
@@ -597,10 +597,10 @@ pub struct ServersSetChangeParams {
 }
 
 pub fn new_servers_set_change_session(
-	self_key_pair: Arc<NodeKeyPair>,
+	self_key_pair: Arc<dyn NodeKeyPair>,
 	sessions: &ClusterSessions,
-	connections: Arc<ConnectionProvider>,
+	connections: Arc<dyn ConnectionProvider>,
-	servers_set_change_creator_connector: Arc<ServersSetChangeSessionCreatorConnector>,
+	servers_set_change_creator_connector: Arc<dyn ServersSetChangeSessionCreatorConnector>,
 	params: ServersSetChangeParams,
 ) -> Result<WaitableSession<AdminSession>, Error> {
 	let session_id = match params.session_id {
@@ -757,9 +757,9 @@ pub mod tests {
 			unimplemented!("test-only")
 		}
 
-		fn add_generation_listener(&self, _listener: Arc<ClusterSessionsListener<GenerationSession>>) {}
+		fn add_generation_listener(&self, _listener: Arc<dyn ClusterSessionsListener<GenerationSession>>) {}
-		fn add_decryption_listener(&self, _listener: Arc<ClusterSessionsListener<DecryptionSession>>) {}
+		fn add_decryption_listener(&self, _listener: Arc<dyn ClusterSessionsListener<DecryptionSession>>) {}
-		fn add_key_version_negotiation_listener(&self, _listener: Arc<ClusterSessionsListener<KeyVersionNegotiationSession<KeyVersionNegotiationSessionTransport>>>) {}
+		fn add_key_version_negotiation_listener(&self, _listener: Arc<dyn ClusterSessionsListener<KeyVersionNegotiationSession<KeyVersionNegotiationSessionTransport>>>) {}
 
 		fn make_faulty_generation_sessions(&self) { unimplemented!("test-only") }
 		fn generation_session(&self, _session_id: &SessionId) -> Option<Arc<GenerationSession>> { unimplemented!("test-only") }

secret-store/src/key_server_cluster/cluster_connections.rs

@@ -37,7 +37,7 @@ pub trait Connection: Send + Sync {
 /// Connections manager. Responsible for keeping us connected to all required nodes.
 pub trait ConnectionManager: 'static + Send + Sync {
 	/// Returns shared reference to connections provider.
-	fn provider(&self) -> Arc<ConnectionProvider>;
+	fn provider(&self) -> Arc<dyn ConnectionProvider>;
 	/// Try to reach all disconnected nodes immediately. This method is exposed mostly for
 	/// tests, where all 'nodes' are starting listening for incoming connections first and
 	/// only after this, they're actually start connecting to each other.
@@ -55,7 +55,7 @@ pub trait ConnectionProvider: Send + Sync {
 	/// Returns the set of currently disconnected nodes.
 	fn disconnected_nodes(&self) -> BTreeSet<NodeId>;
 	/// Returns the reference to the active node connection or None if the node is not connected.
-	fn connection(&self, node: &NodeId) -> Option<Arc<Connection>>;
+	fn connection(&self, node: &NodeId) -> Option<Arc<dyn Connection>>;
 }
 
 #[cfg(test)]
@@ -110,7 +110,7 @@ pub mod tests {
 	}
 
 	impl ConnectionManager for Arc<TestConnections> {
-		fn provider(&self) -> Arc<ConnectionProvider> {
+		fn provider(&self) -> Arc<dyn ConnectionProvider> {
 			self.clone()
 		}
 
@@ -129,7 +129,7 @@ pub mod tests {
 			self.disconnected_nodes.lock().clone()
 		}
 
-		fn connection(&self, node: &NodeId) -> Option<Arc<Connection>> {
+		fn connection(&self, node: &NodeId) -> Option<Arc<dyn Connection>> {
 			match self.connected_nodes.lock().contains(node) {
 				true => Some(Arc::new(TestConnection {
 					from: self.node,

secret-store/src/key_server_cluster/cluster_connections_net.rs

@@ -38,7 +38,7 @@ use key_server_cluster::net::{accept_connection as io_accept_connection,
 	connect as io_connect, Connection as IoConnection};
 
 /// Empty future.
-pub type BoxedEmptyFuture = Box<Future<Item = (), Error = ()> + Send>;
+pub type BoxedEmptyFuture = Box<dyn Future<Item = (), Error = ()> + Send>;
 
 /// Maintain interval (seconds). Every MAINTAIN_INTERVAL seconds node:
 /// 1) checks if connected nodes are responding to KeepAlive messages
@@ -79,11 +79,11 @@ struct NetConnectionsData {
 	/// Reference to tokio task executor.
 	executor: Executor,
 	/// Key pair of this node.
-	self_key_pair: Arc<NodeKeyPair>,
+	self_key_pair: Arc<dyn NodeKeyPair>,
 	/// Network messages processor.
-	message_processor: Arc<MessageProcessor>,
+	message_processor: Arc<dyn MessageProcessor>,
 	/// Connections trigger.
-	trigger: Mutex<Box<ConnectionTrigger>>,
+	trigger: Mutex<Box<dyn ConnectionTrigger>>,
 	/// Mutable connection data.
 	container: Arc<RwLock<NetConnectionsContainer>>,
 }
@@ -121,8 +121,8 @@ impl NetConnectionsManager {
 	/// Create new network connections manager.
 	pub fn new(
 		executor: Executor,
-		message_processor: Arc<MessageProcessor>,
+		message_processor: Arc<dyn MessageProcessor>,
-		trigger: Box<ConnectionTrigger>,
+		trigger: Box<dyn ConnectionTrigger>,
 		container: Arc<RwLock<NetConnectionsContainer>>,
 		config: &ClusterConfiguration,
 		net_config: NetConnectionsManagerConfig,
@@ -153,7 +153,7 @@ impl NetConnectionsManager {
 }
 
 impl ConnectionManager for NetConnectionsManager {
-	fn provider(&self) -> Arc<ConnectionProvider> {
+	fn provider(&self) -> Arc<dyn ConnectionProvider> {
 		self.data.container.clone()
 	}
 
@@ -180,7 +180,7 @@ impl ConnectionProvider for RwLock<NetConnectionsContainer> {
 			.collect()
 	}
 
-	fn connection(&self, node: &NodeId) -> Option<Arc<Connection>> {
+	fn connection(&self, node: &NodeId) -> Option<Arc<dyn Connection>> {
 		match self.read().connections.get(node).cloned() {
 			Some(connection) => Some(connection),
 			None => None,
@@ -302,7 +302,7 @@ impl NetConnectionsData {
 			trace!(target: "secretstore_net", "{}: removing connection to {} at {}",
 				self.self_key_pair.public(), node_id, entry.get().node_address());
 			entry.remove_entry();
-		
+
 			true
 		} else {
 			false

secret-store/src/key_server_cluster/cluster_message_processor.rs

@@ -32,7 +32,7 @@ pub trait MessageProcessor: Send + Sync {
 	/// Process disconnect from the remote node.
 	fn process_disconnect(&self, node: &NodeId);
 	/// Process single message from the connection.
-	fn process_connection_message(&self, connection: Arc<Connection>, message: Message);
+	fn process_connection_message(&self, connection: Arc<dyn Connection>, message: Message);
 
 	/// Start servers set change session. This is typically used by ConnectionManager when
 	/// it detects that auto-migration session needs to be started.
@@ -49,19 +49,19 @@ pub trait MessageProcessor: Send + Sync {
 
 /// Bridge between ConnectionManager and ClusterSessions.
 pub struct SessionsMessageProcessor {
-	self_key_pair: Arc<NodeKeyPair>,
+	self_key_pair: Arc<dyn NodeKeyPair>,
-	servers_set_change_creator_connector: Arc<ServersSetChangeSessionCreatorConnector>,
+	servers_set_change_creator_connector: Arc<dyn ServersSetChangeSessionCreatorConnector>,
 	sessions: Arc<ClusterSessions>,
-	connections: Arc<ConnectionProvider>,
+	connections: Arc<dyn ConnectionProvider>,
 }
 
 impl SessionsMessageProcessor {
 	/// Create new instance of SessionsMessageProcessor.
 	pub fn new(
-		self_key_pair: Arc<NodeKeyPair>,
+		self_key_pair: Arc<dyn NodeKeyPair>,
-		servers_set_change_creator_connector: Arc<ServersSetChangeSessionCreatorConnector>,
+		servers_set_change_creator_connector: Arc<dyn ServersSetChangeSessionCreatorConnector>,
 		sessions: Arc<ClusterSessions>,
-		connections: Arc<ConnectionProvider>,
+		connections: Arc<dyn ConnectionProvider>,
 	) -> Self {
 		SessionsMessageProcessor {
 			self_key_pair,
@@ -75,7 +75,7 @@ impl SessionsMessageProcessor {
 	fn process_message<S: ClusterSession, SC: ClusterSessionCreator<S>>(
 		&self,
 		sessions: &ClusterSessionsContainer<S, SC>,
-		connection: Arc<Connection>,
+		connection: Arc<dyn Connection>,
 		mut message: Message,
 	) -> Option<Arc<S>>
 		where
@@ -198,7 +198,7 @@ impl SessionsMessageProcessor {
 	}
 
 	/// Process single cluster message from the connection.
-	fn process_cluster_message(&self, connection: Arc<Connection>, message: ClusterMessage) {
+	fn process_cluster_message(&self, connection: Arc<dyn Connection>, message: ClusterMessage) {
 		match message {
 			ClusterMessage::KeepAlive(_) => {
 				let msg = Message::Cluster(ClusterMessage::KeepAliveResponse(message::KeepAliveResponse {
@@ -220,7 +220,7 @@ impl MessageProcessor for SessionsMessageProcessor {
 		self.sessions.on_connection_timeout(node);
 	}
 
-	fn process_connection_message(&self, connection: Arc<Connection>, message: Message) {
+	fn process_connection_message(&self, connection: Arc<dyn Connection>, message: Message) {
 		trace!(target: "secretstore_net", "{}: received message {} from {}",
 			self.self_key_pair.public(), message, connection.node_id());
 

secret-store/src/key_server_cluster/cluster_sessions.rs

@@ -188,7 +188,7 @@ pub struct ClusterSessionsContainer<S: ClusterSession, SC: ClusterSessionCreator
 	/// Active sessions.
 	sessions: RwLock<BTreeMap<S::Id, QueuedSession<S>>>,
 	/// Listeners. Lock order: sessions -> listeners.
-	listeners: Mutex<Vec<Weak<ClusterSessionsListener<S>>>>,
+	listeners: Mutex<Vec<Weak<dyn ClusterSessionsListener<S>>>>,
 	/// Sessions container state.
 	container_state: Arc<Mutex<ClusterSessionsContainerState>>,
 	/// Do not actually remove sessions.
@@ -200,7 +200,7 @@ pub struct QueuedSession<S> {
 	/// Session master.
 	pub master: NodeId,
 	/// Cluster view.
-	pub cluster_view: Arc<Cluster>,
+	pub cluster_view: Arc<dyn Cluster>,
 	/// Last keep alive time.
 	pub last_keep_alive_time: Instant,
 	/// Last received message time.
@@ -224,7 +224,7 @@ pub enum ClusterSessionsContainerState {
 
 impl ClusterSessions {
 	/// Create new cluster sessions container.
-	pub fn new(config: &ClusterConfiguration, servers_set_change_session_creator_connector: Arc<ServersSetChangeSessionCreatorConnector>) -> Self {
+	pub fn new(config: &ClusterConfiguration, servers_set_change_session_creator_connector: Arc<dyn ServersSetChangeSessionCreatorConnector>) -> Self {
 		let container_state = Arc::new(Mutex::new(ClusterSessionsContainerState::Idle));
 		let creator_core = Arc::new(SessionCreatorCore::new(config));
 		ClusterSessions {
@@ -320,7 +320,7 @@ impl<S, SC> ClusterSessionsContainer<S, SC> where S: ClusterSession, SC: Cluster
 		}
 	}
 
-	pub fn add_listener(&self, listener: Arc<ClusterSessionsListener<S>>) {
+	pub fn add_listener(&self, listener: Arc<dyn ClusterSessionsListener<S>>) {
 		self.listeners.lock().push(Arc::downgrade(&listener));
 	}
 
@@ -347,7 +347,7 @@ impl<S, SC> ClusterSessionsContainer<S, SC> where S: ClusterSession, SC: Cluster
 
 	pub fn insert(
 		&self,
-		cluster: Arc<Cluster>,
+		cluster: Arc<dyn Cluster>,
 		master: NodeId,
 		session_id: S::Id,
 		session_nonce: Option<u64>,
@@ -439,7 +439,7 @@ impl<S, SC> ClusterSessionsContainer<S, SC> where S: ClusterSession, SC: Cluster
 		}
 	}
 
-	fn notify_listeners<F: Fn(&ClusterSessionsListener<S>) -> ()>(&self, callback: F) {
+	fn notify_listeners<F: Fn(&dyn ClusterSessionsListener<S>) -> ()>(&self, callback: F) {
 		let mut listeners = self.listeners.lock();
 		let mut listener_index = 0;
 		while listener_index < listeners.len() {
@@ -621,7 +621,7 @@ impl<S: ClusterSession> WaitableSession<S> {
 		}
 	}
 
-	pub fn into_wait_future(self) -> Box<Future<Item=S::SuccessfulResult, Error=Error> + Send> {
+	pub fn into_wait_future(self) -> Box<dyn Future<Item=S::SuccessfulResult, Error=Error> + Send> {
 		Box::new(self.oneshot
 			.map_err(|e| Error::Internal(e.to_string()))
 			.and_then(|res| res))
@@ -647,7 +647,7 @@ impl<T> CompletionSignal<T> {
 	}
 }
 
-pub fn create_cluster_view(self_key_pair: Arc<NodeKeyPair>, connections: Arc<ConnectionProvider>, requires_all_connections: bool) -> Result<Arc<Cluster>, Error> {
+pub fn create_cluster_view(self_key_pair: Arc<dyn NodeKeyPair>, connections: Arc<dyn ConnectionProvider>, requires_all_connections: bool) -> Result<Arc<dyn Cluster>, Error> {
 	let mut connected_nodes = connections.connected_nodes()?;
 	let disconnected_nodes = connections.disconnected_nodes();
 

secret-store/src/key_server_cluster/cluster_sessions_creator.rs

@@ -56,7 +56,7 @@ pub trait ClusterSessionCreator<S: ClusterSession> {
 	/// Create cluster session.
 	fn create(
 		&self,
-		cluster: Arc<Cluster>,
+		cluster: Arc<dyn Cluster>,
 		master: NodeId,
 		nonce: Option<u64>,
 		id: S::Id,
@@ -74,9 +74,9 @@ pub struct SessionCreatorCore {
 	/// Self node id.
 	self_node_id: NodeId,
 	/// Reference to key storage
-	key_storage: Arc<KeyStorage>,
+	key_storage: Arc<dyn KeyStorage>,
 	/// Reference to ACL storage
-	acl_storage: Arc<AclStorage>,
+	acl_storage: Arc<dyn AclStorage>,
 	/// Always-increasing sessions counter. Is used as session nonce to prevent replay attacks:
 	/// 1) during handshake, KeyServers generate new random key to encrypt messages
 	/// => there's no way to use messages from previous connections for replay attacks
@@ -153,7 +153,7 @@ impl ClusterSessionCreator<GenerationSessionImpl> for GenerationSessionCreator {
 
 	fn create(
 		&self,
-		cluster: Arc<Cluster>,
+		cluster: Arc<dyn Cluster>,
 		master: NodeId,
 		nonce: Option<u64>,
 		id: SessionId,
@@ -198,7 +198,7 @@ impl ClusterSessionCreator<EncryptionSessionImpl> for EncryptionSessionCreator {
 
 	fn create(
 		&self,
-		cluster: Arc<Cluster>,
+		cluster: Arc<dyn Cluster>,
 		master: NodeId,
 		nonce: Option<u64>,
 		id: SessionId,
@@ -248,7 +248,7 @@ impl ClusterSessionCreator<DecryptionSessionImpl> for DecryptionSessionCreator {
 
 	fn create(
 		&self,
-		cluster: Arc<Cluster>,
+		cluster: Arc<dyn Cluster>,
 		master: NodeId,
 		nonce: Option<u64>,
 		id: SessionIdWithSubSession,
@@ -305,7 +305,7 @@ impl ClusterSessionCreator<SchnorrSigningSessionImpl> for SchnorrSigningSessionC
 
 	fn create(
 		&self,
-		cluster: Arc<Cluster>,
+		cluster: Arc<dyn Cluster>,
 		master: NodeId,
 		nonce: Option<u64>,
 		id: SessionIdWithSubSession,
@@ -359,7 +359,7 @@ impl ClusterSessionCreator<EcdsaSigningSessionImpl> for EcdsaSigningSessionCreat
 		}))
 	}
 
-	fn create(&self, cluster: Arc<Cluster>, master: NodeId, nonce: Option<u64>, id: SessionIdWithSubSession, requester: Option<Requester>) -> Result<WaitableSession<EcdsaSigningSessionImpl>, Error> {
+	fn create(&self, cluster: Arc<dyn Cluster>, master: NodeId, nonce: Option<u64>, id: SessionIdWithSubSession, requester: Option<Requester>) -> Result<WaitableSession<EcdsaSigningSessionImpl>, Error> {
 		let encrypted_data = self.core.read_key_share(&id.id)?;
 		let nonce = self.core.check_session_nonce(&master, nonce)?;
 		let (session, oneshot) = EcdsaSigningSessionImpl::new(EcdsaSigningSessionParams {
@@ -403,7 +403,7 @@ impl ClusterSessionCreator<KeyVersionNegotiationSessionImpl<VersionNegotiationTr
 
 	fn create(
 		&self,
-		cluster: Arc<Cluster>,
+		cluster: Arc<dyn Cluster>,
 		master: NodeId,
 		nonce: Option<u64>,
 		id: SessionIdWithSubSession,
@@ -445,7 +445,7 @@ pub struct AdminSessionCreator {
 	/// Administrator public.
 	pub admin_public: Option<Public>,
 	/// Servers set change sessions creator connector.
-	pub servers_set_change_session_creator_connector: Arc<ServersSetChangeSessionCreatorConnector>,
+	pub servers_set_change_session_creator_connector: Arc<dyn ServersSetChangeSessionCreatorConnector>,
 }
 
 impl ClusterSessionCreator<AdminSession> for AdminSessionCreator {
@@ -476,7 +476,7 @@ impl ClusterSessionCreator<AdminSession> for AdminSessionCreator {
 
 	fn create(
 		&self,
-		cluster: Arc<Cluster>,
+		cluster: Arc<dyn Cluster>,
 		master: NodeId,
 		nonce: Option<u64>,
 		id: SessionId,

secret-store/src/key_server_cluster/connection_trigger.rs

@@ -52,7 +52,7 @@ pub trait ConnectionTrigger: Send + Sync {
 	/// Maintain active connections.
 	fn maintain_connections(&mut self, connections: &mut NetConnectionsContainer);
 	/// Return connector for the servers set change session creator.
-	fn servers_set_change_creator_connector(&self) -> Arc<ServersSetChangeSessionCreatorConnector>;
+	fn servers_set_change_creator_connector(&self) -> Arc<dyn ServersSetChangeSessionCreatorConnector>;
 }
 
 /// Servers set change session creator connector.
@@ -67,11 +67,11 @@ pub trait ServersSetChangeSessionCreatorConnector: Send + Sync {
 /// Simple connection trigger, which only keeps connections to current_set.
 pub struct SimpleConnectionTrigger {
 	/// Key server set cluster.
-	key_server_set: Arc<KeyServerSet>,
+	key_server_set: Arc<dyn KeyServerSet>,
 	/// Trigger connections.
 	connections: TriggerConnections,
 	/// Servers set change session creator connector.
-	connector: Arc<ServersSetChangeSessionCreatorConnector>,
+	connector: Arc<dyn ServersSetChangeSessionCreatorConnector>,
 }
 
 /// Simple Servers set change session creator connector, which will just return
@@ -93,7 +93,7 @@ pub enum ConnectionsAction {
 /// Trigger connections.
 pub struct TriggerConnections {
 	/// This node key pair.
-	pub self_key_pair: Arc<NodeKeyPair>,
+	pub self_key_pair: Arc<dyn NodeKeyPair>,
 }
 
 impl SimpleConnectionTrigger {
@@ -103,7 +103,7 @@ impl SimpleConnectionTrigger {
 	}
 
 	/// Create new simple connection trigger.
-	pub fn new(key_server_set: Arc<KeyServerSet>, self_key_pair: Arc<NodeKeyPair>, admin_public: Option<Public>) -> Self {
+	pub fn new(key_server_set: Arc<dyn KeyServerSet>, self_key_pair: Arc<dyn NodeKeyPair>, admin_public: Option<Public>) -> Self {
 		SimpleConnectionTrigger {
 			key_server_set: key_server_set,
 			connections: TriggerConnections {
@@ -139,7 +139,7 @@ impl ConnectionTrigger for SimpleConnectionTrigger {
 		self.connections.maintain(ConnectionsAction::ConnectToCurrentSet, connections, &self.key_server_set.snapshot())
 	}
 
-	fn servers_set_change_creator_connector(&self) -> Arc<ServersSetChangeSessionCreatorConnector> {
+	fn servers_set_change_creator_connector(&self) -> Arc<dyn ServersSetChangeSessionCreatorConnector> {
 		self.connector.clone()
 	}
 }

secret-store/src/key_server_cluster/connection_trigger_with_migration.rs

@@ -33,9 +33,9 @@ use {NodeKeyPair};
 /// Key servers set change trigger with automated migration procedure.
 pub struct ConnectionTriggerWithMigration {
 	/// This node key pair.
-	self_key_pair: Arc<NodeKeyPair>,
+	self_key_pair: Arc<dyn NodeKeyPair>,
 	/// Key server set.
-	key_server_set: Arc<KeyServerSet>,
+	key_server_set: Arc<dyn KeyServerSet>,
 	/// Last server set state.
 	snapshot: KeyServerSetSnapshot,
 	/// Required connections action.
@@ -105,9 +105,9 @@ struct TriggerSession {
 	/// Servers set change session creator connector.
 	connector: Arc<ServersSetChangeSessionCreatorConnectorWithMigration>,
 	/// This node key pair.
-	self_key_pair: Arc<NodeKeyPair>,
+	self_key_pair: Arc<dyn NodeKeyPair>,
 	/// Key server set.
-	key_server_set: Arc<KeyServerSet>,
+	key_server_set: Arc<dyn KeyServerSet>,
 }
 
 impl ConnectionTriggerWithMigration {
@@ -117,7 +117,7 @@ impl ConnectionTriggerWithMigration {
 	}
 
 	/// Create new trigge with migration.
-	pub fn new(key_server_set: Arc<KeyServerSet>, self_key_pair: Arc<NodeKeyPair>) -> Self {
+	pub fn new(key_server_set: Arc<dyn KeyServerSet>, self_key_pair: Arc<dyn NodeKeyPair>) -> Self {
 		let snapshot = key_server_set.snapshot();
 		let migration = snapshot.migration.clone();
 
@@ -203,7 +203,7 @@ impl ConnectionTrigger for ConnectionTriggerWithMigration {
 		}
 	}
 
-	fn servers_set_change_creator_connector(&self) -> Arc<ServersSetChangeSessionCreatorConnector> {
+	fn servers_set_change_creator_connector(&self) -> Arc<dyn ServersSetChangeSessionCreatorConnector> {
 		self.session.connector.clone()
 	}
 }

secret-store/src/key_server_cluster/io/deadline.rs

@@ -19,7 +19,7 @@ use std::time::Duration;
 use futures::{Future, Poll};
 use tokio::timer::timeout::{Timeout, Error as TimeoutError};
 
-type DeadlineBox<F> = Box<Future<
+type DeadlineBox<F> = Box<dyn Future<
 	Item = DeadlineStatus<<F as Future>::Item>,
 	Error = TimeoutError<<F as Future>::Error>
 > + Send>;

secret-store/src/key_server_cluster/io/handshake.rs

@@ -46,14 +46,14 @@ use key_server_cluster::io::{write_message, write_encrypted_message, WriteMessag
 	read_message, read_encrypted_message, fix_shared_key};
 
 /// Start handshake procedure with another node from the cluster.
-pub fn handshake<A>(a: A, self_key_pair: Arc<NodeKeyPair>, trusted_nodes: BTreeSet<NodeId>) -> Handshake<A> where A: AsyncWrite + AsyncRead {
+pub fn handshake<A>(a: A, self_key_pair: Arc<dyn NodeKeyPair>, trusted_nodes: BTreeSet<NodeId>) -> Handshake<A> where A: AsyncWrite + AsyncRead {
 	let init_data = Random.generate().map(|kp| *kp.secret().clone()).map_err(Into::into)
 		.and_then(|cp| Random.generate().map(|kp| (cp, kp)).map_err(Into::into));
 	handshake_with_init_data(a, init_data, self_key_pair, trusted_nodes)
 }
 
 /// Start handshake procedure with another node from the cluster and given plain confirmation + session key pair.
-pub fn handshake_with_init_data<A>(a: A, init_data: Result<(H256, KeyPair), Error>, self_key_pair: Arc<NodeKeyPair>, trusted_nodes: BTreeSet<NodeId>) -> Handshake<A> where A: AsyncWrite + AsyncRead {
+pub fn handshake_with_init_data<A>(a: A, init_data: Result<(H256, KeyPair), Error>, self_key_pair: Arc<dyn NodeKeyPair>, trusted_nodes: BTreeSet<NodeId>) -> Handshake<A> where A: AsyncWrite + AsyncRead {
 	let handshake_input_data = init_data
 		.and_then(|(cp, kp)| sign(kp.secret(), &cp).map(|sp| (cp, kp, sp)).map_err(Into::into))
 		.and_then(|(cp, kp, sp)| Handshake::<A>::make_public_key_message(self_key_pair.public().clone(), cp.clone(), sp).map(|msg| (cp, kp, msg)));
@@ -79,7 +79,7 @@ pub fn handshake_with_init_data<A>(a: A, init_data: Result<(H256, KeyPair), Erro
 }
 
 /// Wait for handshake procedure to be started by another node from the cluster.
-pub fn accept_handshake<A>(a: A, self_key_pair: Arc<NodeKeyPair>) -> Handshake<A> where A: AsyncWrite + AsyncRead {
+pub fn accept_handshake<A>(a: A, self_key_pair: Arc<dyn NodeKeyPair>) -> Handshake<A> where A: AsyncWrite + AsyncRead {
 	let self_confirmation_plain = Random.generate().map(|kp| *kp.secret().clone()).map_err(Into::into);
 	let handshake_input_data = self_confirmation_plain
 		.and_then(|cp| Random.generate().map(|kp| (cp, kp)).map_err(Into::into));
@@ -118,7 +118,7 @@ pub struct Handshake<A> {
 	is_active: bool,
 	error: Option<(A, Result<HandshakeResult, Error>)>,
 	state: HandshakeState<A>,
-	self_key_pair: Arc<NodeKeyPair>,
+	self_key_pair: Arc<dyn NodeKeyPair>,
 	self_session_key_pair: Option<KeyPair>,
 	self_confirmation_plain: H256,
 	trusted_nodes: Option<BTreeSet<NodeId>>,
@@ -156,7 +156,7 @@ impl<A> Handshake<A> where A: AsyncRead + AsyncWrite {
 		})))
 	}
 
-	fn make_private_key_signature_message(self_key_pair: &NodeKeyPair, confirmation_plain: &H256) -> Result<Message, Error> {
+	fn make_private_key_signature_message(self_key_pair: &dyn NodeKeyPair, confirmation_plain: &H256) -> Result<Message, Error> {
 		Ok(Message::Cluster(ClusterMessage::NodePrivateKeySignature(NodePrivateKeySignature {
 			confirmation_signed: self_key_pair.sign(confirmation_plain)?.into(),
 		})))

secret-store/src/key_server_cluster/jobs/key_access_job.rs

@@ -26,13 +26,13 @@ pub struct KeyAccessJob {
 	/// Has key share?
 	has_key_share: bool,
 	/// ACL storage.
-	acl_storage: Arc<AclStorage>,
+	acl_storage: Arc<dyn AclStorage>,
 	/// Requester data.
 	requester: Option<Requester>,
 }
 
 impl KeyAccessJob {
-	pub fn new_on_slave(id: SessionId, acl_storage: Arc<AclStorage>) -> Self {
+	pub fn new_on_slave(id: SessionId, acl_storage: Arc<dyn AclStorage>) -> Self {
 		KeyAccessJob {
 			id: id,
 			has_key_share: true,
@@ -41,7 +41,7 @@ impl KeyAccessJob {
 		}
 	}
 
-	pub fn new_on_master(id: SessionId, acl_storage: Arc<AclStorage>, requester: Requester) -> Self {
+	pub fn new_on_master(id: SessionId, acl_storage: Arc<dyn AclStorage>, requester: Requester) -> Self {
 		KeyAccessJob {
 			id: id,
 			has_key_share: true,
@@ -76,7 +76,7 @@ impl JobExecutor for KeyAccessJob {
 		if !self.has_key_share {
 			return Ok(JobPartialRequestAction::Reject(false));
 		}
-		
+
 		self.requester = Some(partial_request.clone());
 		self.acl_storage.check(partial_request.address(&self.id).map_err(Error::InsufficientRequesterData)?, &self.id)
 			.map(|is_confirmed| if is_confirmed { JobPartialRequestAction::Respond(true) } else { JobPartialRequestAction::Reject(false) })

secret-store/src/key_server_cluster/jobs/unknown_sessions_job.rs

@@ -24,18 +24,18 @@ pub struct UnknownSessionsJob {
 	/// Target node id.
 	target_node_id: Option<NodeId>,
 	/// Keys storage.
-	key_storage: Arc<KeyStorage>,
+	key_storage: Arc<dyn KeyStorage>,
 }
 
 impl UnknownSessionsJob {
-	pub fn new_on_slave(key_storage: Arc<KeyStorage>) -> Self {
+	pub fn new_on_slave(key_storage: Arc<dyn KeyStorage>) -> Self {
 		UnknownSessionsJob {
 			target_node_id: None,
 			key_storage: key_storage,
 		}
 	}
 
-	pub fn new_on_master(key_storage: Arc<KeyStorage>, self_node_id: NodeId) -> Self {
+	pub fn new_on_master(key_storage: Arc<dyn KeyStorage>, self_node_id: NodeId) -> Self {
 		UnknownSessionsJob {
 			target_node_id: Some(self_node_id),
 			key_storage: key_storage,

secret-store/src/key_server_cluster/net/accept_connection.rs

@@ -25,7 +25,7 @@ use key_server_cluster::io::{accept_handshake, Handshake, Deadline, deadline};
 use key_server_cluster::net::Connection;
 
 /// Create future for accepting incoming connection.
-pub fn accept_connection(stream: TcpStream, self_key_pair: Arc<NodeKeyPair>) -> Deadline<AcceptConnection> {
+pub fn accept_connection(stream: TcpStream, self_key_pair: Arc<dyn NodeKeyPair>) -> Deadline<AcceptConnection> {
 	// TODO: This could fail so it would be better either to accept the
 	// address as a separate argument or return a result.
 	let address = stream.peer_addr().expect("Unable to determine tcp peer address");

secret-store/src/key_server_cluster/net/connect.rs

@@ -26,7 +26,7 @@ use key_server_cluster::io::{handshake, Handshake, Deadline, deadline};
 use key_server_cluster::net::Connection;
 
 /// Create future for connecting to other node.
-pub fn connect(address: &SocketAddr, self_key_pair: Arc<NodeKeyPair>, trusted_nodes: BTreeSet<NodeId>) -> Deadline<Connect> {
+pub fn connect(address: &SocketAddr, self_key_pair: Arc<dyn NodeKeyPair>, trusted_nodes: BTreeSet<NodeId>) -> Deadline<Connect> {
 	let connect = Connect {
 		state: ConnectState::TcpConnect(TcpStream::connect(address)),
 		address: address.clone(),
@@ -47,7 +47,7 @@ enum ConnectState {
 pub struct Connect {
 	state: ConnectState,
 	address: SocketAddr,
-	self_key_pair: Arc<NodeKeyPair>,
+	self_key_pair: Arc<dyn NodeKeyPair>,
 	trusted_nodes: BTreeSet<NodeId>,
 }
 

secret-store/src/key_server_set.rs

@@ -121,11 +121,11 @@ struct CachedContract {
 	/// Previous confirm migration transaction.
 	confirm_migration_tx: Option<PreviousMigrationTransaction>,
 	/// This node key pair.
-	self_key_pair: Arc<NodeKeyPair>,
+	self_key_pair: Arc<dyn NodeKeyPair>,
 }
 
 impl OnChainKeyServerSet {
-	pub fn new(trusted_client: TrustedClient, contract_address_source: Option<ContractAddress>, self_key_pair: Arc<NodeKeyPair>, auto_migrate_enabled: bool, key_servers: BTreeMap<Public, NodeAddress>) -> Result<Arc<Self>, Error> {
+	pub fn new(trusted_client: TrustedClient, contract_address_source: Option<ContractAddress>, self_key_pair: Arc<dyn NodeKeyPair>, auto_migrate_enabled: bool, key_servers: BTreeMap<Public, NodeAddress>) -> Result<Arc<Self>, Error> {
 		let client = trusted_client.get_untrusted();
 		let key_server_set = Arc::new(OnChainKeyServerSet {
 			contract: Mutex::new(CachedContract::new(trusted_client, contract_address_source, self_key_pair, auto_migrate_enabled, key_servers)?),
@@ -232,7 +232,7 @@ impl <F: Fn(Vec<u8>) -> Result<Vec<u8>, String>> KeyServerSubset<F> for NewKeySe
 }
 
 impl CachedContract {
-	pub fn new(client: TrustedClient, contract_address_source: Option<ContractAddress>, self_key_pair: Arc<NodeKeyPair>, auto_migrate_enabled: bool, key_servers: BTreeMap<Public, NodeAddress>) -> Result<Self, Error> {
+	pub fn new(client: TrustedClient, contract_address_source: Option<ContractAddress>, self_key_pair: Arc<dyn NodeKeyPair>, auto_migrate_enabled: bool, key_servers: BTreeMap<Public, NodeAddress>) -> Result<Self, Error> {
 		let server_set = match contract_address_source.is_none() {
 			true => key_servers.into_iter()
 				.map(|(p, addr)| {
@@ -471,7 +471,7 @@ impl CachedContract {
 		key_servers
 	}
 
-	fn update_number_of_confirmations_if_required(&mut self, client: &BlockChainClient) {
+	fn update_number_of_confirmations_if_required(&mut self, client: &dyn BlockChainClient) {
 		if !self.auto_migrate_enabled {
 			return;
 		}
@@ -574,11 +574,11 @@ fn update_last_transaction_block(client: &Client, migration_id: &H256, previous_
 	true
 }
 
-fn latest_block_hash(client: &BlockChainClient) -> H256 {
+fn latest_block_hash(client: &dyn BlockChainClient) -> H256 {
 	client.block_hash(BlockId::Latest).unwrap_or_default()
 }
 
-fn block_confirmations(client: &BlockChainClient, block: H256) -> Option<u64> {
+fn block_confirmations(client: &dyn BlockChainClient, block: H256) -> Option<u64> {
 	client.block_number(BlockId::Hash(block))
 		.and_then(|block| client.block_number(BlockId::Latest).map(|last_block| (block, last_block)))
 		.map(|(block, last_block)| last_block - block)

secret-store/src/key_storage.rs

@@ -72,17 +72,17 @@ pub trait KeyStorage: Send + Sync {
 	/// Check if storage contains document encryption key
 	fn contains(&self, document: &ServerKeyId) -> bool;
 	/// Iterate through storage
-	fn iter<'a>(&'a self) -> Box<Iterator<Item=(ServerKeyId, DocumentKeyShare)> + 'a>;
+	fn iter<'a>(&'a self) -> Box<dyn Iterator<Item=(ServerKeyId, DocumentKeyShare)> + 'a>;
 }
 
 /// Persistent document encryption keys storage
 pub struct PersistentKeyStorage {
-	db: Arc<KeyValueDB>,
+	db: Arc<dyn KeyValueDB>,
 }
 
 /// Persistent document encryption keys storage iterator
 pub struct PersistentKeyStorageIterator<'a> {
-	iter: Box<Iterator<Item=(Box<[u8]>, Box<[u8]>)> + 'a>,
+	iter: Box<dyn Iterator<Item=(Box<[u8]>, Box<[u8]>)> + 'a>,
 }
 
 /// V3 of encrypted key share, as it is stored by key storage on the single key server.
@@ -115,7 +115,7 @@ struct SerializableDocumentKeyShareVersionV3 {
 
 impl PersistentKeyStorage {
 	/// Create new persistent document encryption keys storage
-	pub fn new(db: Arc<KeyValueDB>) -> Result<Self, Error> {
+	pub fn new(db: Arc<dyn KeyValueDB>) -> Result<Self, Error> {
 		let db = upgrade_db(db)?;
 
 		Ok(PersistentKeyStorage {
@@ -124,7 +124,7 @@ impl PersistentKeyStorage {
 	}
 }
 
-fn upgrade_db(db: Arc<KeyValueDB>) -> Result<Arc<KeyValueDB>, Error> {
+fn upgrade_db(db: Arc<dyn KeyValueDB>) -> Result<Arc<dyn KeyValueDB>, Error> {
 	let version = db.get(None, DB_META_KEY_VERSION)?;
 	let version = version.and_then(|v| v.get(0).cloned());
 	match version {
@@ -185,7 +185,7 @@ impl KeyStorage for PersistentKeyStorage {
 			.unwrap_or(false)
 	}
 
-	fn iter<'a>(&'a self) -> Box<Iterator<Item=(ServerKeyId, DocumentKeyShare)> + 'a> {
+	fn iter<'a>(&'a self) -> Box<dyn Iterator<Item=(ServerKeyId, DocumentKeyShare)> + 'a> {
 		Box::new(PersistentKeyStorageIterator {
 			iter: self.db.iter(None),
 		})
@@ -336,7 +336,7 @@ pub mod tests {
 			self.keys.read().contains_key(document)
 		}
 
-		fn iter<'a>(&'a self) -> Box<Iterator<Item=(ServerKeyId, DocumentKeyShare)> + 'a> {
+		fn iter<'a>(&'a self) -> Box<dyn Iterator<Item=(ServerKeyId, DocumentKeyShare)> + 'a> {
 			Box::new(self.keys.read().clone().into_iter())
 		}
 	}

secret-store/src/lib.rs

@@ -91,11 +91,11 @@ pub use self::node_key_pair::PlainNodeKeyPair;
 pub use self::node_key_pair::KeyStoreNodeKeyPair;
 
 /// Start new key server instance
-pub fn start(client: Arc<Client>, sync: Arc<SyncProvider>, miner: Arc<Miner>, self_key_pair: Arc<NodeKeyPair>, mut config: ServiceConfiguration,
+pub fn start(client: Arc<Client>, sync: Arc<dyn SyncProvider>, miner: Arc<Miner>, self_key_pair: Arc<dyn NodeKeyPair>, mut config: ServiceConfiguration,
-	db: Arc<KeyValueDB>, executor: Executor) -> Result<Box<KeyServer>, Error>
+	db: Arc<dyn KeyValueDB>, executor: Executor) -> Result<Box<dyn KeyServer>, Error>
 {
 	let trusted_client = trusted_client::TrustedClient::new(self_key_pair.clone(), client.clone(), sync, miner);
-	let acl_storage: Arc<acl_storage::AclStorage> = match config.acl_check_contract_address.take() {
+	let acl_storage: Arc<dyn acl_storage::AclStorage> = match config.acl_check_contract_address.take() {
 		Some(acl_check_contract_address) => acl_storage::OnChainAclStorage::new(trusted_client.clone(), acl_check_contract_address)?,
 		None => Arc::new(acl_storage::DummyAclStorage::default()),
 	};
@@ -106,7 +106,7 @@ pub fn start(client: Arc<Client>, sync: Arc<SyncProvider>, miner: Arc<Miner>, se
 	let key_server = Arc::new(key_server::KeyServerImpl::new(&config.cluster_config, key_server_set.clone(), self_key_pair.clone(),
 		acl_storage.clone(), key_storage.clone(), executor.clone())?);
 	let cluster = key_server.cluster();
-	let key_server: Arc<KeyServer> = key_server;
+	let key_server: Arc<dyn KeyServer> = key_server;
 
 	// prepare HTTP listener
 	let http_listener = match config.listener_address {
@@ -123,7 +123,7 @@ pub fn start(client: Arc<Client>, sync: Arc<SyncProvider>, miner: Arc<Miner>, se
 			address,
 			self_key_pair.clone()));
 
-	let mut contracts: Vec<Arc<listener::service_contract::ServiceContract>> = Vec::new();
+	let mut contracts: Vec<Arc<dyn listener::service_contract::ServiceContract>> = Vec::new();
 	config.service_contract_address.map(|address|
 		create_service_contract(address,
 			listener::service_contract::SERVICE_CONTRACT_REGISTRY_NAME.to_owned(),
@@ -150,7 +150,7 @@ pub fn start(client: Arc<Client>, sync: Arc<SyncProvider>, miner: Arc<Miner>, se
 			listener::ApiMask { document_key_shadow_retrieval_requests: true, ..Default::default() }))
 		.map(|l| contracts.push(l));
 
-	let contract: Option<Arc<listener::service_contract::ServiceContract>> = match contracts.len() {
+	let contract: Option<Arc<dyn listener::service_contract::ServiceContract>> = match contracts.len() {
 		0 => None,
 		1 => Some(contracts.pop().expect("contract.len() is 1; qed")),
 		_ => Some(Arc::new(listener::service_contract_aggregate::OnChainServiceContractAggregate::new(contracts))),

secret-store/src/listener/http_listener.rs

@@ -89,13 +89,13 @@ struct KeyServerHttpHandler {
 
 /// Shared http handler
 struct KeyServerSharedHttpHandler {
-	key_server: Weak<KeyServer>,
+	key_server: Weak<dyn KeyServer>,
 }
 
 
 impl KeyServerHttpListener {
 	/// Start KeyServer http listener
-	pub fn start(listener_address: NodeAddress, cors_domains: Option<Vec<String>>, key_server: Weak<KeyServer>, executor: Executor) -> Result<Self, Error> {
+	pub fn start(listener_address: NodeAddress, cors_domains: Option<Vec<String>>, key_server: Weak<dyn KeyServer>, executor: Executor) -> Result<Self, Error> {
 		let shared_handler = Arc::new(KeyServerSharedHttpHandler {
 			key_server: key_server,
 		});
@@ -130,7 +130,7 @@ impl KeyServerHttpListener {
 }
 
 impl KeyServerHttpHandler {
-	fn key_server(&self) -> Result<Arc<KeyServer>, Error> {
+	fn key_server(&self) -> Result<Arc<dyn KeyServer>, Error> {
 		self.handler.key_server.upgrade()
 			.ok_or_else(|| Error::Internal("KeyServer is already destroyed".into()))
 	}
@@ -142,7 +142,7 @@ impl KeyServerHttpHandler {
 		path: &str,
 		req_body: &[u8],
 		cors: AllowCors<AccessControlAllowOrigin>,
-	) -> Box<Future<Item=HttpResponse<Body>, Error=hyper::Error> + Send> {
+	) -> Box<dyn Future<Item=HttpResponse<Body>, Error=hyper::Error> + Send> {
 		match parse_request(&req_method, &path, &req_body) {
 			Request::GenerateServerKey(document, signature, threshold) =>
 				Box::new(result(self.key_server())
@@ -219,7 +219,7 @@ impl Service for KeyServerHttpHandler {
 	type ReqBody = Body;
 	type ResBody = Body;
 	type Error = hyper::Error;
-	type Future = Box<Future<Item = HttpResponse<Self::ResBody>, Error=Self::Error> + Send>;
+	type Future = Box<dyn Future<Item = HttpResponse<Self::ResBody>, Error=Self::Error> + Send>;
 
 	fn call(&mut self, req: HttpRequest<Body>) -> Self::Future {
 		let cors = cors::get_cors_allow_origin(
@@ -462,7 +462,7 @@ mod tests {
 
 	#[test]
 	fn http_listener_successfully_drops() {
-		let key_server: Arc<KeyServer> = Arc::new(DummyKeyServer::default());
+		let key_server: Arc<dyn KeyServer> = Arc::new(DummyKeyServer::default());
 		let address = NodeAddress { address: "127.0.0.1".into(), port: 9000 };
 		let runtime = Runtime::with_thread_count(1);
 		let listener = KeyServerHttpListener::start(address, None, Arc::downgrade(&key_server),

secret-store/src/listener/mod.rs

@@ -42,7 +42,7 @@ pub struct ApiMask {
 
 /// Combined HTTP + service contract listener.
 pub struct Listener {
-	key_server: Arc<KeyServer>,
+	key_server: Arc<dyn KeyServer>,
 	_http: Option<http_listener::KeyServerHttpListener>,
 	_contract: Option<Arc<service_contract_listener::ServiceContractListener>>,
 }
@@ -61,7 +61,7 @@ impl ApiMask {
 
 impl Listener {
 	/// Create new listener.
-	pub fn new(key_server: Arc<KeyServer>, http: Option<http_listener::KeyServerHttpListener>, contract: Option<Arc<service_contract_listener::ServiceContractListener>>) -> Self {
+	pub fn new(key_server: Arc<dyn KeyServer>, http: Option<http_listener::KeyServerHttpListener>, contract: Option<Arc<service_contract_listener::ServiceContractListener>>) -> Self {
 		Self {
 			key_server: key_server,
 			_http: http,
@@ -78,7 +78,7 @@ impl ServerKeyGenerator for Listener {
 		key_id: ServerKeyId,
 		author: Requester,
 		threshold: usize,
-	) -> Box<Future<Item=Public, Error=Error> + Send> {
+	) -> Box<dyn Future<Item=Public, Error=Error> + Send> {
 		self.key_server.generate_key(key_id, author, threshold)
 	}
 
@@ -86,7 +86,7 @@ impl ServerKeyGenerator for Listener {
 		&self,
 		key_id: ServerKeyId,
 		author: Requester,
-	) -> Box<Future<Item=Public, Error=Error> + Send> {
+	) -> Box<dyn Future<Item=Public, Error=Error> + Send> {
 		self.key_server.restore_key_public(key_id, author)
 	}
 }
@@ -98,7 +98,7 @@ impl DocumentKeyServer for Listener {
 		author: Requester,
 		common_point: Public,
 		encrypted_document_key: Public,
-	) -> Box<Future<Item=(), Error=Error> + Send> {
+	) -> Box<dyn Future<Item=(), Error=Error> + Send> {
 		self.key_server.store_document_key(key_id, author, common_point, encrypted_document_key)
 	}
 
@@ -107,7 +107,7 @@ impl DocumentKeyServer for Listener {
 		key_id: ServerKeyId,
 		author: Requester,
 		threshold: usize,
-	) -> Box<Future<Item=EncryptedDocumentKey, Error=Error> + Send> {
+	) -> Box<dyn Future<Item=EncryptedDocumentKey, Error=Error> + Send> {
 		self.key_server.generate_document_key(key_id, author, threshold)
 	}
 
@@ -115,7 +115,7 @@ impl DocumentKeyServer for Listener {
 		&self,
 		key_id: ServerKeyId,
 		requester: Requester,
-	) -> Box<Future<Item=EncryptedDocumentKey, Error=Error> + Send> {
+	) -> Box<dyn Future<Item=EncryptedDocumentKey, Error=Error> + Send> {
 		self.key_server.restore_document_key(key_id, requester)
 	}
 
@@ -123,7 +123,7 @@ impl DocumentKeyServer for Listener {
 		&self,
 		key_id: ServerKeyId,
 		requester: Requester,
-	) -> Box<Future<Item=EncryptedDocumentKeyShadow, Error=Error> + Send> {
+	) -> Box<dyn Future<Item=EncryptedDocumentKeyShadow, Error=Error> + Send> {
 		self.key_server.restore_document_key_shadow(key_id, requester)
 	}
 }
@@ -134,7 +134,7 @@ impl MessageSigner for Listener {
 		key_id: ServerKeyId,
 		requester: Requester,
 		message: MessageHash,
-	) -> Box<Future<Item=EncryptedMessageSignature, Error=Error> + Send> {
+	) -> Box<dyn Future<Item=EncryptedMessageSignature, Error=Error> + Send> {
 		self.key_server.sign_message_schnorr(key_id, requester, message)
 	}
 
@@ -143,7 +143,7 @@ impl MessageSigner for Listener {
 		key_id: ServerKeyId,
 		requester: Requester,
 		message: MessageHash,
-	) -> Box<Future<Item=EncryptedMessageSignature, Error=Error> + Send> {
+	) -> Box<dyn Future<Item=EncryptedMessageSignature, Error=Error> + Send> {
 		self.key_server.sign_message_ecdsa(key_id, requester, message)
 	}
 }
@@ -154,7 +154,7 @@ impl AdminSessionsServer for Listener {
 		old_set_signature: RequestSignature,
 		new_set_signature: RequestSignature,
 		new_servers_set: BTreeSet<NodeId>,
-	) -> Box<Future<Item=(), Error=Error> + Send> {
+	) -> Box<dyn Future<Item=(), Error=Error> + Send> {
 		self.key_server.change_servers_set(old_set_signature, new_set_signature, new_servers_set)
 	}
 }

secret-store/src/listener/service_contract.rs

@@ -70,9 +70,9 @@ pub trait ServiceContract: Send + Sync {
 	/// Update contract when new blocks are enacted. Returns true if contract is installed && up-to-date (i.e. chain is synced).
 	fn update(&self) -> bool;
 	/// Read recent contract logs. Returns topics of every entry.
-	fn read_logs(&self) -> Box<Iterator<Item=ServiceTask>>;
+	fn read_logs(&self) -> Box<dyn Iterator<Item=ServiceTask>>;
 	/// Publish generated key.
-	fn read_pending_requests(&self) -> Box<Iterator<Item=(bool, ServiceTask)>>;
+	fn read_pending_requests(&self) -> Box<dyn Iterator<Item=(bool, ServiceTask)>>;
 	/// Publish generated server key.
 	fn publish_generated_server_key(&self, origin: &Address, server_key_id: &ServerKeyId, server_key: Public) -> Result<(), String>;
 	/// Publish server key generation error.
@@ -100,7 +100,7 @@ pub struct OnChainServiceContract {
 	/// Blockchain client.
 	client: TrustedClient,
 	/// This node key pair.
-	self_key_pair: Arc<NodeKeyPair>,
+	self_key_pair: Arc<dyn NodeKeyPair>,
 	/// Contract registry name (if any).
 	name: String,
 	/// Contract address source.
@@ -138,7 +138,7 @@ struct DocumentKeyShadowRetrievalService;
 
 impl OnChainServiceContract {
 	/// Create new on-chain service contract.
-	pub fn new(mask: ApiMask, client: TrustedClient, name: String, address_source: ContractAddress, self_key_pair: Arc<NodeKeyPair>) -> Self {
+	pub fn new(mask: ApiMask, client: TrustedClient, name: String, address_source: ContractAddress, self_key_pair: Arc<dyn NodeKeyPair>) -> Self {
 		let contract = OnChainServiceContract {
 			mask: mask,
 			client: client,
@@ -191,8 +191,8 @@ impl OnChainServiceContract {
 	/// Create task-specific pending requests iterator.
 	fn create_pending_requests_iterator<
 		C: 'static + Fn(&Client, &Address, &BlockId) -> Result<U256, String>,
-		R: 'static + Fn(&NodeKeyPair, &Client, &Address, &BlockId, U256) -> Result<(bool, ServiceTask), String>
+		R: 'static + Fn(&dyn NodeKeyPair, &Client, &Address, &BlockId, U256) -> Result<(bool, ServiceTask), String>
-	>(&self, client: Arc<Client>, contract_address: &Address, block: &BlockId, get_count: C, read_item: R) -> Box<Iterator<Item=(bool, ServiceTask)>> {
+	>(&self, client: Arc<Client>, contract_address: &Address, block: &BlockId, get_count: C, read_item: R) -> Box<dyn Iterator<Item=(bool, ServiceTask)>> {
 		get_count(&*client, contract_address, block)
 			.map(|count| {
 				let client = client.clone();
@@ -209,7 +209,7 @@ impl OnChainServiceContract {
 						.ok(),
 					index: 0.into(),
 					length: count,
-				}) as Box<Iterator<Item=(bool, ServiceTask)>>
+				}) as Box<dyn Iterator<Item=(bool, ServiceTask)>>
 			})
 			.map_err(|error| {
 				warn!(target: "secretstore", "{}: creating pending requests iterator failed: {}",
@@ -240,7 +240,7 @@ impl ServiceContract for OnChainServiceContract {
 		self.update_contract_address() && self.client.get().is_some()
 	}
 
-	fn read_logs(&self) -> Box<Iterator<Item=ServiceTask>> {
+	fn read_logs(&self) -> Box<dyn Iterator<Item=ServiceTask>> {
 		let client = match self.client.get() {
 			Some(client) => client,
 			None => {
@@ -310,7 +310,7 @@ impl ServiceContract for OnChainServiceContract {
 			}).collect::<Vec<_>>().into_iter())
 	}
 
-	fn read_pending_requests(&self) -> Box<Iterator<Item=(bool, ServiceTask)>> {
+	fn read_pending_requests(&self) -> Box<dyn Iterator<Item=(bool, ServiceTask)>> {
 		let client = match self.client.get() {
 			Some(client) => client,
 			None => return Box::new(::std::iter::empty()),
@@ -327,7 +327,7 @@ impl ServiceContract for OnChainServiceContract {
 					let iter = match self.mask.server_key_generation_requests {
 						true => Box::new(self.create_pending_requests_iterator(client.clone(), &contract_address, &block,
 							&ServerKeyGenerationService::read_pending_requests_count,
-							&ServerKeyGenerationService::read_pending_request)) as Box<Iterator<Item=(bool, ServiceTask)>>,
+							&ServerKeyGenerationService::read_pending_request)) as Box<dyn Iterator<Item=(bool, ServiceTask)>>,
 						false => Box::new(::std::iter::empty()),
 					};
 					let iter = match self.mask.server_key_retrieval_requests {
@@ -484,7 +484,7 @@ impl ServerKeyGenerationService {
 	}
 
 	/// Read pending request.
-	fn read_pending_request(self_key_pair: &NodeKeyPair, client: &Client, contract_address: &Address, block: &BlockId, index: U256) -> Result<(bool, ServiceTask), String> {
+	fn read_pending_request(self_key_pair: &dyn NodeKeyPair, client: &Client, contract_address: &Address, block: &BlockId, index: U256) -> Result<(bool, ServiceTask), String> {
 		let self_address = public_to_address(self_key_pair.public());
 
 		let (encoded, decoder) = service::functions::get_server_key_generation_request::call(index);
@@ -544,7 +544,7 @@ impl ServerKeyRetrievalService {
 	}
 
 	/// Read pending request.
-	fn read_pending_request(self_key_pair: &NodeKeyPair, client: &Client, contract_address: &Address, block: &BlockId, index: U256) -> Result<(bool, ServiceTask), String> {
+	fn read_pending_request(self_key_pair: &dyn NodeKeyPair, client: &Client, contract_address: &Address, block: &BlockId, index: U256) -> Result<(bool, ServiceTask), String> {
 		let self_address = public_to_address(self_key_pair.public());
 
 		let (encoded, decoder) = service::functions::get_server_key_retrieval_request::call(index);
@@ -607,7 +607,7 @@ impl DocumentKeyStoreService {
 	}
 
 	/// Read pending request.
-	fn read_pending_request(self_key_pair: &NodeKeyPair, client: &Client, contract_address: &Address, block: &BlockId, index: U256) -> Result<(bool, ServiceTask), String> {
+	fn read_pending_request(self_key_pair: &dyn NodeKeyPair, client: &Client, contract_address: &Address, block: &BlockId, index: U256) -> Result<(bool, ServiceTask), String> {
 		let self_address = public_to_address(self_key_pair.public());
 		let (encoded, decoder) = service::functions::get_document_key_store_request::call(index);
 		let (server_key_id, author, common_point, encrypted_point) = decoder.decode(&client.call_contract(*block, *contract_address, encoded)?)
@@ -687,7 +687,7 @@ impl DocumentKeyShadowRetrievalService {
 	}
 
 	/// Read pending request.
-	fn read_pending_request(self_key_pair: &NodeKeyPair, client: &Client, contract_address: &Address, block: &BlockId, index: U256) -> Result<(bool, ServiceTask), String> {
+	fn read_pending_request(self_key_pair: &dyn NodeKeyPair, client: &Client, contract_address: &Address, block: &BlockId, index: U256) -> Result<(bool, ServiceTask), String> {
 		let self_address = public_to_address(self_key_pair.public());
 
 		let (encoded, decoder) = service::functions::get_document_key_shadow_retrieval_request::call(index);
@@ -781,11 +781,11 @@ pub mod tests {
 			true
 		}
 
-		fn read_logs(&self) -> Box<Iterator<Item=ServiceTask>> {
+		fn read_logs(&self) -> Box<dyn Iterator<Item=ServiceTask>> {
 			Box::new(self.logs.clone().into_iter())
 		}
 
-		fn read_pending_requests(&self) -> Box<Iterator<Item=(bool, ServiceTask)>> {
+		fn read_pending_requests(&self) -> Box<dyn Iterator<Item=(bool, ServiceTask)>> {
 			Box::new(self.pending_requests.clone().into_iter())
 		}
 

secret-store/src/listener/service_contract_aggregate.rs

@@ -25,12 +25,12 @@ use {ServerKeyId};
 /// Aggregated on-chain service contract.
 pub struct OnChainServiceContractAggregate {
 	/// All hosted service contracts.
-	contracts: Vec<Arc<ServiceContract>>,
+	contracts: Vec<Arc<dyn ServiceContract>>,
 }
 
 impl OnChainServiceContractAggregate {
 	/// Create new aggregated service contract listener.
-	pub fn new(contracts: Vec<Arc<ServiceContract>>) -> Self {
+	pub fn new(contracts: Vec<Arc<dyn ServiceContract>>) -> Self {
 		debug_assert!(contracts.len() > 1);
 		OnChainServiceContractAggregate {
 			contracts: contracts,
@@ -47,15 +47,15 @@ impl ServiceContract for OnChainServiceContractAggregate {
 		result
 	}
 
-	fn read_logs(&self) -> Box<Iterator<Item=ServiceTask>> {
+	fn read_logs(&self) -> Box<dyn Iterator<Item=ServiceTask>> {
 		self.contracts.iter()
-			.fold(Box::new(::std::iter::empty()) as Box<Iterator<Item=ServiceTask>>, |i, c|
+			.fold(Box::new(::std::iter::empty()) as Box<dyn Iterator<Item=ServiceTask>>, |i, c|
 				Box::new(i.chain(c.read_logs())))
 	}
 
-	fn read_pending_requests(&self) -> Box<Iterator<Item=(bool, ServiceTask)>> {
+	fn read_pending_requests(&self) -> Box<dyn Iterator<Item=(bool, ServiceTask)>> {
 		self.contracts.iter()
-			.fold(Box::new(::std::iter::empty()) as Box<Iterator<Item=(bool, ServiceTask)>>, |i, c|
+			.fold(Box::new(::std::iter::empty()) as Box<dyn Iterator<Item=(bool, ServiceTask)>>, |i, c|
 				Box::new(i.chain(c.read_pending_requests())))
 	}
 

secret-store/src/listener/service_contract_listener.rs

@@ -62,17 +62,17 @@ pub struct ServiceContractListener {
 /// Service contract listener parameters.
 pub struct ServiceContractListenerParams {
 	/// Service contract.
-	pub contract: Arc<ServiceContract>,
+	pub contract: Arc<dyn ServiceContract>,
 	/// This node key pair.
-	pub self_key_pair: Arc<NodeKeyPair>,
+	pub self_key_pair: Arc<dyn NodeKeyPair>,
 	/// Key servers set.
-	pub key_server_set: Arc<KeyServerSet>,
+	pub key_server_set: Arc<dyn KeyServerSet>,
 	/// ACL storage reference.
-	pub acl_storage: Arc<AclStorage>,
+	pub acl_storage: Arc<dyn AclStorage>,
 	/// Cluster reference.
-	pub cluster: Arc<ClusterClient>,
+	pub cluster: Arc<dyn ClusterClient>,
 	/// Key storage reference.
-	pub key_storage: Arc<KeyStorage>,
+	pub key_storage: Arc<dyn KeyStorage>,
 }
 
 /// Service contract listener data.
@@ -84,17 +84,17 @@ struct ServiceContractListenerData {
 	/// Service tasks queue.
 	pub tasks_queue: Arc<TasksQueue<ServiceTask>>,
 	/// Service contract.
-	pub contract: Arc<ServiceContract>,
+	pub contract: Arc<dyn ServiceContract>,
 	/// ACL storage reference.
-	pub acl_storage: Arc<AclStorage>,
+	pub acl_storage: Arc<dyn AclStorage>,
 	/// Cluster client reference.
-	pub cluster: Arc<ClusterClient>,
+	pub cluster: Arc<dyn ClusterClient>,
 	/// This node key pair.
-	pub self_key_pair: Arc<NodeKeyPair>,
+	pub self_key_pair: Arc<dyn NodeKeyPair>,
 	/// Key servers set.
-	pub key_server_set: Arc<KeyServerSet>,
+	pub key_server_set: Arc<dyn KeyServerSet>,
 	/// Key storage reference.
-	pub key_storage: Arc<KeyStorage>,
+	pub key_storage: Arc<dyn KeyStorage>,
 
 }
 
@@ -561,7 +561,7 @@ fn log_service_task_result(task: &ServiceTask, self_id: &Public, result: Result<
 }
 
 /// Returns true when session, related to `server_key_id` must be started on `node`.
-fn is_processed_by_this_key_server(key_server_set: &KeyServerSet, node: &NodeId, server_key_id: &H256) -> bool {
+fn is_processed_by_this_key_server(key_server_set: &dyn KeyServerSet, node: &NodeId, server_key_id: &H256) -> bool {
 	let servers = key_server_set.snapshot().current_set;
 	let total_servers_count = servers.len();
 	match total_servers_count {
@@ -613,7 +613,7 @@ mod tests {
 		key_storage
 	}
 
-	fn make_servers_set(is_isolated: bool) -> Arc<KeyServerSet> {
+	fn make_servers_set(is_isolated: bool) -> Arc<dyn KeyServerSet> {
 		Arc::new(MapKeyServerSet::new(is_isolated, vec![
 			("79be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798483ada7726a3c4655da4fbfc0e1108a8fd17b448a68554199c47d08ffb10d4b8".parse().unwrap(),
 				"127.0.0.1:8080".parse().unwrap()),
@@ -624,7 +624,7 @@ mod tests {
 		].into_iter().collect()))
 	}
 
-	fn make_service_contract_listener(contract: Option<Arc<ServiceContract>>, cluster: Option<Arc<DummyClusterClient>>, key_storage: Option<Arc<KeyStorage>>, acl_storage: Option<Arc<AclStorage>>, servers_set: Option<Arc<KeyServerSet>>) -> Arc<ServiceContractListener> {
+	fn make_service_contract_listener(contract: Option<Arc<dyn ServiceContract>>, cluster: Option<Arc<DummyClusterClient>>, key_storage: Option<Arc<dyn KeyStorage>>, acl_storage: Option<Arc<dyn AclStorage>>, servers_set: Option<Arc<dyn KeyServerSet>>) -> Arc<ServiceContractListener> {
 		let contract = contract.unwrap_or_else(|| Arc::new(DummyServiceContract::default()));
 		let cluster = cluster.unwrap_or_else(|| Arc::new(DummyClusterClient::default()));
 		let key_storage = key_storage.unwrap_or_else(|| Arc::new(DummyKeyStorage::default()));

secret-store/src/traits.rs

@@ -45,7 +45,7 @@ pub trait ServerKeyGenerator {
 		key_id: ServerKeyId,
 		author: Requester,
 		threshold: usize,
-	) -> Box<Future<Item=Public, Error=Error> + Send>;
+	) -> Box<dyn Future<Item=Public, Error=Error> + Send>;
 	/// Retrieve public portion of previously generated SK.
 	/// `key_id` is identifier of previously generated SK.
 	/// `author` is the same author, that has created the server key.
@@ -53,7 +53,7 @@ pub trait ServerKeyGenerator {
 		&self,
 		key_id: ServerKeyId,
 		author: Requester,
-	) -> Box<Future<Item=Public, Error=Error> + Send>;
+	) -> Box<dyn Future<Item=Public, Error=Error> + Send>;
 }
 
 /// Document key (DK) server.
@@ -70,7 +70,7 @@ pub trait DocumentKeyServer: ServerKeyGenerator {
 		author: Requester,
 		common_point: Public,
 		encrypted_document_key: Public,
-	) -> Box<Future<Item=(), Error=Error> + Send>;
+	) -> Box<dyn Future<Item=(), Error=Error> + Send>;
 	/// Generate and store both SK and DK. This is a shortcut for consequent calls of `generate_key` and `store_document_key`.
 	/// The only difference is that DK is generated by DocumentKeyServer (which might be considered unsafe).
 	/// `key_id` is the caller-provided identifier of generated SK.
@@ -82,7 +82,7 @@ pub trait DocumentKeyServer: ServerKeyGenerator {
 		key_id: ServerKeyId,
 		author: Requester,
 		threshold: usize,
-	) -> Box<Future<Item=EncryptedDocumentKey, Error=Error> + Send>;
+	) -> Box<dyn Future<Item=EncryptedDocumentKey, Error=Error> + Send>;
 	/// Restore previously stored DK.
 	/// DK is decrypted on the key server (which might be considered unsafe), and then encrypted with caller public key.
 	/// `key_id` is identifier of previously generated SK.
@@ -92,7 +92,7 @@ pub trait DocumentKeyServer: ServerKeyGenerator {
 		&self,
 		key_id: ServerKeyId,
 		requester: Requester,
-	) -> Box<Future<Item=EncryptedDocumentKey, Error=Error> + Send>;
+	) -> Box<dyn Future<Item=EncryptedDocumentKey, Error=Error> + Send>;
 	/// Restore previously stored DK.
 	/// To decrypt DK on client:
 	/// 1) use requestor secret key to decrypt secret coefficients from result.decrypt_shadows
@@ -104,7 +104,7 @@ pub trait DocumentKeyServer: ServerKeyGenerator {
 		&self,
 		key_id: ServerKeyId,
 		requester: Requester,
-	) -> Box<Future<Item=EncryptedDocumentKeyShadow, Error=Error> + Send>;
+	) -> Box<dyn Future<Item=EncryptedDocumentKeyShadow, Error=Error> + Send>;
 }
 
 /// Message signer.
@@ -119,7 +119,7 @@ pub trait MessageSigner: ServerKeyGenerator {
 		key_id: ServerKeyId,
 		requester: Requester,
 		message: MessageHash,
-	) -> Box<Future<Item=EncryptedMessageSignature, Error=Error> + Send>;
+	) -> Box<dyn Future<Item=EncryptedMessageSignature, Error=Error> + Send>;
 	/// Generate ECDSA signature for message with previously generated SK.
 	/// WARNING: only possible when SK was generated using t <= 2 * N.
 	/// `key_id` is the caller-provided identifier of generated SK.
@@ -131,7 +131,7 @@ pub trait MessageSigner: ServerKeyGenerator {
 		key_id: ServerKeyId,
 		signature: Requester,
 		message: MessageHash,
-	) -> Box<Future<Item=EncryptedMessageSignature, Error=Error> + Send>;
+	) -> Box<dyn Future<Item=EncryptedMessageSignature, Error=Error> + Send>;
 }
 
 /// Administrative sessions server.
@@ -145,7 +145,7 @@ pub trait AdminSessionsServer {
 		old_set_signature: RequestSignature,
 		new_set_signature: RequestSignature,
 		new_servers_set: BTreeSet<NodeId>,
-	) -> Box<Future<Item=(), Error=Error> + Send>;
+	) -> Box<dyn Future<Item=(), Error=Error> + Send>;
 }
 
 /// Key server.

secret-store/src/trusted_client.rs

@@ -33,11 +33,11 @@ use {Error, NodeKeyPair, ContractAddress};
 /// 'Trusted' client weak reference.
 pub struct TrustedClient {
 	/// This key server node key pair.
-	self_key_pair: Arc<NodeKeyPair>,
+	self_key_pair: Arc<dyn NodeKeyPair>,
 	/// Blockchain client.
 	client: Weak<Client>,
 	/// Sync provider.
-	sync: Weak<SyncProvider>,
+	sync: Weak<dyn SyncProvider>,
 	/// Miner service.
 	miner: Weak<Miner>,
 }

util/fetch/src/client.rs

@@ -871,7 +871,7 @@ mod test {
 		type ReqBody = hyper::Body;
 		type ResBody = hyper::Body;
 		type Error = Error;
-		type Future = Box<Future<Item=hyper::Response<Self::ResBody>, Error=Self::Error> + Send + 'static>;
+		type Future = Box<dyn Future<Item=hyper::Response<Self::ResBody>, Error=Self::Error> + Send + 'static>;
 
 		fn call(&mut self, req: hyper::Request<hyper::Body>) -> Self::Future {
 			match req.uri().path() {