Remove unused code (#6525)

Signed-off-by: Andrei Sandu <andrei-mihail@parity.io>

Signed-off-by: Andrei Sandu <andrei-mihail@parity.io>

polkadot/node/subsystem-types/src/messages.rs

@@ -58,12 +58,6 @@ use std::{
 pub mod network_bridge_event;
 pub use network_bridge_event::NetworkBridgeEvent;
 
-/// Subsystem messages where each message is always bound to a relay parent.
-pub trait BoundToRelayParent {
-	/// Returns the relay parent this message is bound to.
-	fn relay_parent(&self) -> Hash;
-}
-
 /// Messages received by the Candidate Backing subsystem.
 #[derive(Debug)]
 pub enum CandidateBackingMessage {
@@ -78,16 +72,6 @@ pub enum CandidateBackingMessage {
 	Statement(Hash, SignedFullStatement),
 }
 
-impl BoundToRelayParent for CandidateBackingMessage {
-	fn relay_parent(&self) -> Hash {
-		match self {
-			Self::GetBackedCandidates(hash, _, _) => *hash,
-			Self::Second(hash, _, _) => *hash,
-			Self::Statement(hash, _) => *hash,
-		}
-	}
-}
-
 /// Blanket error for validation failing for internal reasons.
 #[derive(Debug, Error)]
 #[error("Validation failed with {0:?}")]
@@ -170,17 +154,6 @@ pub enum CandidateValidationMessage {
 	),
 }
 
-impl CandidateValidationMessage {
-	/// If the current variant contains the relay parent hash, return it.
-	pub fn relay_parent(&self) -> Option<Hash> {
-		match self {
-			Self::ValidateFromChainState(_, _, _, _) => None,
-			Self::ValidateFromExhaustive(_, _, _, _, _, _) => None,
-			Self::PreCheck(relay_parent, _, _) => Some(*relay_parent),
-		}
-	}
-}
-
 /// Messages received by the Collator Protocol subsystem.
 #[derive(Debug, derive_more::From)]
 pub enum CollatorProtocolMessage {
@@ -218,12 +191,6 @@ impl Default for CollatorProtocolMessage {
 	}
 }
 
-impl BoundToRelayParent for CollatorProtocolMessage {
-	fn relay_parent(&self) -> Hash {
-		Default::default()
-	}
-}
-
 /// Messages received by the dispute coordinator subsystem.
 ///
 /// NOTE: Any response oneshots might get cancelled if the `DisputeCoordinator` was not yet
@@ -397,23 +364,6 @@ pub enum NetworkBridgeTxMessage {
 	},
 }
 
-impl NetworkBridgeTxMessage {
-	/// If the current variant contains the relay parent hash, return it.
-	pub fn relay_parent(&self) -> Option<Hash> {
-		match self {
-			Self::ReportPeer(_, _) => None,
-			Self::DisconnectPeer(_, _) => None,
-			Self::SendValidationMessage(_, _) => None,
-			Self::SendCollationMessage(_, _) => None,
-			Self::SendValidationMessages(_) => None,
-			Self::SendCollationMessages(_) => None,
-			Self::ConnectToValidators { .. } => None,
-			Self::ConnectToResolvedValidators { .. } => None,
-			Self::SendRequests { .. } => None,
-		}
-	}
-}
-
 /// Availability Distribution Message.
 #[derive(Debug)]
 pub enum AvailabilityDistributionMessage {
@@ -463,16 +413,6 @@ pub enum BitfieldDistributionMessage {
 	NetworkBridgeUpdate(NetworkBridgeEvent<net_protocol::BitfieldDistributionMessage>),
 }
 
-impl BitfieldDistributionMessage {
-	/// If the current variant contains the relay parent hash, return it.
-	pub fn relay_parent(&self) -> Option<Hash> {
-		match self {
-			Self::DistributeBitfield(hash, _) => Some(*hash),
-			Self::NetworkBridgeUpdate(_) => None,
-		}
-	}
-}
-
 /// Availability store subsystem message.
 #[derive(Debug)]
 pub enum AvailabilityStoreMessage {
@@ -526,13 +466,6 @@ pub enum AvailabilityStoreMessage {
 	},
 }
 
-impl AvailabilityStoreMessage {
-	/// In fact, none of the `AvailabilityStore` messages assume a particular relay parent.
-	pub fn relay_parent(&self) -> Option<Hash> {
-		None
-	}
-}
-
 /// A response channel for the result of a chain API request.
 pub type ChainApiResponseChannel<T> = oneshot::Sender<Result<T, crate::errors::ChainApiError>>;
 
@@ -575,13 +508,6 @@ pub enum ChainApiMessage {
 	},
 }
 
-impl ChainApiMessage {
-	/// If the current variant contains the relay parent hash, return it.
-	pub fn relay_parent(&self) -> Option<Hash> {
-		None
-	}
-}
-
 /// Chain selection subsystem messages
 #[derive(Debug)]
 pub enum ChainSelectionMessage {
@@ -594,20 +520,6 @@ pub enum ChainSelectionMessage {
 	BestLeafContaining(Hash, oneshot::Sender<Option<Hash>>),
 }
 
-impl ChainSelectionMessage {
-	/// If the current variant contains the relay parent hash, return it.
-	pub fn relay_parent(&self) -> Option<Hash> {
-		// None of the messages, even the ones containing specific
-		// block hashes, can be considered to have those blocks as
-		// a relay parent.
-		match *self {
-			ChainSelectionMessage::Approved(_) => None,
-			ChainSelectionMessage::Leaves(_) => None,
-			ChainSelectionMessage::BestLeafContaining(..) => None,
-		}
-	}
-}
-
 /// A sender for the result of a runtime API request.
 pub type RuntimeApiSender<T> = oneshot::Sender<Result<T, crate::errors::RuntimeApiError>>;
 
@@ -702,15 +614,6 @@ pub enum RuntimeApiMessage {
 	Request(Hash, RuntimeApiRequest),
 }
 
-impl RuntimeApiMessage {
-	/// If the current variant contains the relay parent hash, return it.
-	pub fn relay_parent(&self) -> Option<Hash> {
-		match self {
-			Self::Request(hash, _) => Some(*hash),
-		}
-	}
-}
-
 /// Statement distribution message.
 #[derive(Debug, derive_more::From)]
 pub enum StatementDistributionMessage {
@@ -762,15 +665,6 @@ pub enum ProvisionerMessage {
 	ProvisionableData(Hash, ProvisionableData),
 }
 
-impl BoundToRelayParent for ProvisionerMessage {
-	fn relay_parent(&self) -> Hash {
-		match self {
-			Self::RequestInherentData(hash, _) => *hash,
-			Self::ProvisionableData(hash, _) => *hash,
-		}
-	}
-}
-
 /// Message to the Collation Generation subsystem.
 #[derive(Debug)]
 pub enum CollationGenerationMessage {
@@ -778,13 +672,6 @@ pub enum CollationGenerationMessage {
 	Initialize(CollationGenerationConfig),
 }
 
-impl CollationGenerationMessage {
-	/// If the current variant contains the relay parent hash, return it.
-	pub fn relay_parent(&self) -> Option<Hash> {
-		None
-	}
-}
-
 /// The result type of [`ApprovalVotingMessage::CheckAndImportAssignment`] request.
 #[derive(Debug, Clone, PartialEq, Eq)]
 pub enum AssignmentCheckResult {