Add AcceptedTransactionIDs to ChainChanged notification and VirtualSelectedParentChain RPC (#2036)

* Add acceptedTransactionIds to GetVirtualSelectedParentChainFromBlockResponseMessage and VirtualSelectedParentChainChangedNotificationMessage

* Modify appmessage structs to include new fields

* Implement the functionality for acceptedTransactionID notifications

* Add missing field for IncludeAcceptedTransactionIds

* Notify of block added before notifying that chain changed

* Use consensushashing instead of Transaction.ID

* Don't notify of empty virtual changes

* Don't generate virtualChainChanged notification if there's nobody subscribed

* Fix test to not expect empty notifications

* Don't generate acceptedTransactionIDs if they were not requested by anyone

Co-authored-by: Ori Newman <orinewman1@gmail.com>

app/appmessage/rpc_get_virtual_selected_parent_chain_from_block.go

@@ -4,7 +4,8 @@ package appmessage
 // its respective RPC message
 type GetVirtualSelectedParentChainFromBlockRequestMessage struct {
 	baseMessage
-	StartHash string
+	StartHash                     string
+	IncludeAcceptedTransactionIDs bool
 }
 
 // Command returns the protocol command string for the message
@@ -13,18 +14,29 @@ func (msg *GetVirtualSelectedParentChainFromBlockRequestMessage) Command() Messa
 }
 
 // NewGetVirtualSelectedParentChainFromBlockRequestMessage returns a instance of the message
-func NewGetVirtualSelectedParentChainFromBlockRequestMessage(startHash string) *GetVirtualSelectedParentChainFromBlockRequestMessage {
+func NewGetVirtualSelectedParentChainFromBlockRequestMessage(
+	startHash string, includeAcceptedTransactionIDs bool) *GetVirtualSelectedParentChainFromBlockRequestMessage {
+
 	return &GetVirtualSelectedParentChainFromBlockRequestMessage{
-		StartHash: startHash,
+		StartHash:                     startHash,
+		IncludeAcceptedTransactionIDs: includeAcceptedTransactionIDs,
 	}
 }
 
+// AcceptedTransactionIDs is a part of the GetVirtualSelectedParentChainFromBlockResponseMessage and
+// VirtualSelectedParentChainChangedNotificationMessage appmessages
+type AcceptedTransactionIDs struct {
+	AcceptingBlockHash     string
+	AcceptedTransactionIDs []string
+}
+
 // GetVirtualSelectedParentChainFromBlockResponseMessage is an appmessage corresponding to
 // its respective RPC message
 type GetVirtualSelectedParentChainFromBlockResponseMessage struct {
 	baseMessage
 	RemovedChainBlockHashes []string
 	AddedChainBlockHashes   []string
+	AcceptedTransactionIDs  []*AcceptedTransactionIDs
 
 	Error *RPCError
 }
@@ -36,10 +48,11 @@ func (msg *GetVirtualSelectedParentChainFromBlockResponseMessage) Command() Mess
 
 // NewGetVirtualSelectedParentChainFromBlockResponseMessage returns a instance of the message
 func NewGetVirtualSelectedParentChainFromBlockResponseMessage(removedChainBlockHashes,
-	addedChainBlockHashes []string) *GetVirtualSelectedParentChainFromBlockResponseMessage {
+	addedChainBlockHashes []string, acceptedTransactionIDs []*AcceptedTransactionIDs) *GetVirtualSelectedParentChainFromBlockResponseMessage {
 
 	return &GetVirtualSelectedParentChainFromBlockResponseMessage{
 		RemovedChainBlockHashes: removedChainBlockHashes,
 		AddedChainBlockHashes:   addedChainBlockHashes,
+		AcceptedTransactionIDs:  acceptedTransactionIDs,
 	}
 }

app/appmessage/rpc_notify_virtual_selected_parent_chain_changed.go

@@ -4,6 +4,7 @@ package appmessage
 // its respective RPC message
 type NotifyVirtualSelectedParentChainChangedRequestMessage struct {
 	baseMessage
+	IncludeAcceptedTransactionIDs bool
 }
 
 // Command returns the protocol command string for the message
@@ -11,9 +12,13 @@ func (msg *NotifyVirtualSelectedParentChainChangedRequestMessage) Command() Mess
 	return CmdNotifyVirtualSelectedParentChainChangedRequestMessage
 }
 
-// NewNotifyVirtualSelectedParentChainChangedRequestMessage returns a instance of the message
-func NewNotifyVirtualSelectedParentChainChangedRequestMessage() *NotifyVirtualSelectedParentChainChangedRequestMessage {
-	return &NotifyVirtualSelectedParentChainChangedRequestMessage{}
+// NewNotifyVirtualSelectedParentChainChangedRequestMessage returns an instance of the message
+func NewNotifyVirtualSelectedParentChainChangedRequestMessage(
+	includeAcceptedTransactionIDs bool) *NotifyVirtualSelectedParentChainChangedRequestMessage {
+
+	return &NotifyVirtualSelectedParentChainChangedRequestMessage{
+		IncludeAcceptedTransactionIDs: includeAcceptedTransactionIDs,
+	}
 }
 
 // NotifyVirtualSelectedParentChainChangedResponseMessage is an appmessage corresponding to
@@ -39,6 +44,7 @@ type VirtualSelectedParentChainChangedNotificationMessage struct {
 	baseMessage
 	RemovedChainBlockHashes []string
 	AddedChainBlockHashes   []string
+	AcceptedTransactionIDs  []*AcceptedTransactionIDs
 }
 
 // Command returns the protocol command string for the message
@@ -48,10 +54,11 @@ func (msg *VirtualSelectedParentChainChangedNotificationMessage) Command() Messa
 
 // NewVirtualSelectedParentChainChangedNotificationMessage returns a instance of the message
 func NewVirtualSelectedParentChainChangedNotificationMessage(removedChainBlockHashes,
-	addedChainBlocks []string) *VirtualSelectedParentChainChangedNotificationMessage {
+	addedChainBlocks []string, acceptedTransactionIDs []*AcceptedTransactionIDs) *VirtualSelectedParentChainChangedNotificationMessage {
 
 	return &VirtualSelectedParentChainChangedNotificationMessage{
 		RemovedChainBlockHashes: removedChainBlockHashes,
 		AddedChainBlockHashes:   addedChainBlocks,
+		AcceptedTransactionIDs:  acceptedTransactionIDs,
 	}
 }

app/rpc/manager.go

@@ -52,18 +52,25 @@ func (m *Manager) NotifyBlockAddedToDAG(block *externalapi.DomainBlock, virtualC
 	onEnd := logger.LogAndMeasureExecutionTime(log, "RPCManager.NotifyBlockAddedToDAG")
 	defer onEnd()
 
-	err := m.NotifyVirtualChange(virtualChangeSet)
-	if err != nil {
-		return err
-	}
-
 	rpcBlock := appmessage.DomainBlockToRPCBlock(block)
-	err = m.context.PopulateBlockWithVerboseData(rpcBlock, block.Header, block, false)
+	err := m.context.PopulateBlockWithVerboseData(rpcBlock, block.Header, block, true)
 	if err != nil {
 		return err
 	}
 	blockAddedNotification := appmessage.NewBlockAddedNotificationMessage(rpcBlock)
-	return m.context.NotificationManager.NotifyBlockAdded(blockAddedNotification)
+	err = m.context.NotificationManager.NotifyBlockAdded(blockAddedNotification)
+	if err != nil {
+		return err
+	}
+
+	// When block was added during IBD - it doesn't incur any Virtual change,
+	// thus no notification is needed.
+	if len(virtualChangeSet.VirtualSelectedParentChainChanges.Added) == 0 &&
+		len(virtualChangeSet.VirtualSelectedParentChainChanges.Removed) == 0 {
+
+		return nil
+	}
+	return m.NotifyVirtualChange(virtualChangeSet)
 }
 
 // NotifyVirtualChange notifies the manager that the virtual block has been changed.
@@ -195,10 +202,25 @@ func (m *Manager) notifyVirtualSelectedParentChainChanged(virtualChangeSet *exte
 	onEnd := logger.LogAndMeasureExecutionTime(log, "RPCManager.NotifyVirtualSelectedParentChainChanged")
 	defer onEnd()
 
-	notification, err := m.context.ConvertVirtualSelectedParentChainChangesToChainChangedNotificationMessage(
-		virtualChangeSet.VirtualSelectedParentChainChanges)
-	if err != nil {
-		return err
+	listenersThatPropagateSelectedParentChanged :=
+		m.context.NotificationManager.AllListenersThatPropagateVirtualSelectedParentChainChanged()
+	if len(listenersThatPropagateSelectedParentChanged) > 0 {
+		// Generating acceptedTransactionIDs is a heavy operation, so we check if it's needed by any listener.
+		includeAcceptedTransactionIDs := false
+		for _, listener := range listenersThatPropagateSelectedParentChanged {
+			if listener.IncludeAcceptedTransactionIDsInVirtualSelectedParentChainChangedNotifications() {
+				includeAcceptedTransactionIDs = true
+				break
+			}
+		}
+
+		notification, err := m.context.ConvertVirtualSelectedParentChainChangesToChainChangedNotificationMessage(
+			virtualChangeSet.VirtualSelectedParentChainChanges, includeAcceptedTransactionIDs)
+		if err != nil {
+			return err
+		}
+		return m.context.NotificationManager.NotifyVirtualSelectedParentChainChanged(notification)
 	}
-	return m.context.NotificationManager.NotifyVirtualSelectedParentChainChanged(notification)
+
+	return nil
 }

app/rpc/rpccontext/chain_changed.go

@@ -3,12 +3,14 @@ package rpccontext
 import (
 	"github.com/kaspanet/kaspad/app/appmessage"
 	"github.com/kaspanet/kaspad/domain/consensus/model/externalapi"
+	"github.com/kaspanet/kaspad/domain/consensus/utils/consensushashing"
 )
 
 // ConvertVirtualSelectedParentChainChangesToChainChangedNotificationMessage converts
 // VirtualSelectedParentChainChanges to VirtualSelectedParentChainChangedNotificationMessage
 func (ctx *Context) ConvertVirtualSelectedParentChainChangesToChainChangedNotificationMessage(
-	selectedParentChainChanges *externalapi.SelectedChainPath) (*appmessage.VirtualSelectedParentChainChangedNotificationMessage, error) {
+	selectedParentChainChanges *externalapi.SelectedChainPath, includeAcceptedTransactionIDs bool) (
+	*appmessage.VirtualSelectedParentChainChangedNotificationMessage, error) {
 
 	removedChainBlockHashes := make([]string, len(selectedParentChainChanges.Removed))
 	for i, removed := range selectedParentChainChanges.Removed {
@@ -20,5 +22,43 @@ func (ctx *Context) ConvertVirtualSelectedParentChainChangesToChainChangedNotifi
 		addedChainBlocks[i] = added.String()
 	}
 
-	return appmessage.NewVirtualSelectedParentChainChangedNotificationMessage(removedChainBlockHashes, addedChainBlocks), nil
+	var acceptedTransactionIDs []*appmessage.AcceptedTransactionIDs
+	if includeAcceptedTransactionIDs {
+		var err error
+		acceptedTransactionIDs, err = ctx.getAndConvertAcceptedTransactionIDs(selectedParentChainChanges)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	return appmessage.NewVirtualSelectedParentChainChangedNotificationMessage(
+		removedChainBlockHashes, addedChainBlocks, acceptedTransactionIDs), nil
+}
+
+func (ctx *Context) getAndConvertAcceptedTransactionIDs(selectedParentChainChanges *externalapi.SelectedChainPath) (
+	[]*appmessage.AcceptedTransactionIDs, error) {
+
+	acceptedTransactionIDs := make([]*appmessage.AcceptedTransactionIDs, len(selectedParentChainChanges.Added))
+
+	for i, addedChainBlock := range selectedParentChainChanges.Added {
+		blockAcceptanceData, err := ctx.Domain.Consensus().GetBlockAcceptanceData(addedChainBlock)
+		if err != nil {
+			return nil, err
+		}
+		acceptedTransactionIDs[i] = &appmessage.AcceptedTransactionIDs{
+			AcceptingBlockHash:     addedChainBlock.String(),
+			AcceptedTransactionIDs: nil,
+		}
+		for _, blockAcceptanceData := range blockAcceptanceData {
+			for _, transactionAcceptanceData := range blockAcceptanceData.TransactionAcceptanceData {
+				if transactionAcceptanceData.IsAccepted {
+					acceptedTransactionIDs[i].AcceptedTransactionIDs =
+						append(acceptedTransactionIDs[i].AcceptedTransactionIDs,
+							consensushashing.TransactionID(transactionAcceptanceData.Transaction).String())
+				}
+			}
+		}
+	}
+
+	return acceptedTransactionIDs, nil
 }

app/rpc/rpccontext/notificationmanager.go

@@ -34,7 +34,8 @@ type NotificationListener struct {
 	propagatePruningPointUTXOSetOverrideNotifications           bool
 	propagateNewBlockTemplateNotifications                      bool
 
-	propagateUTXOsChangedNotificationAddresses map[utxoindex.ScriptPublicKeyString]*UTXOsChangedNotificationAddress
+	propagateUTXOsChangedNotificationAddresses                                    map[utxoindex.ScriptPublicKeyString]*UTXOsChangedNotificationAddress
+	includeAcceptedTransactionIDsInVirtualSelectedParentChainChangedNotifications bool
 }
 
 // NewNotificationManager creates a new NotificationManager
@@ -92,13 +93,27 @@ func (nm *NotificationManager) NotifyBlockAdded(notification *appmessage.BlockAd
 }
 
 // NotifyVirtualSelectedParentChainChanged notifies the notification manager that the DAG's selected parent chain has changed
-func (nm *NotificationManager) NotifyVirtualSelectedParentChainChanged(notification *appmessage.VirtualSelectedParentChainChangedNotificationMessage) error {
+func (nm *NotificationManager) NotifyVirtualSelectedParentChainChanged(
+	notification *appmessage.VirtualSelectedParentChainChangedNotificationMessage) error {
+
 	nm.RLock()
 	defer nm.RUnlock()
 
+	notificationWithoutAcceptedTransactionIDs := &appmessage.VirtualSelectedParentChainChangedNotificationMessage{
+		RemovedChainBlockHashes: notification.RemovedChainBlockHashes,
+		AddedChainBlockHashes:   notification.AddedChainBlockHashes,
+	}
+
 	for router, listener := range nm.listeners {
 		if listener.propagateVirtualSelectedParentChainChangedNotifications {
-			err := router.OutgoingRoute().Enqueue(notification)
+			var err error
+
+			if listener.includeAcceptedTransactionIDsInVirtualSelectedParentChainChangedNotifications {
+				err = router.OutgoingRoute().Enqueue(notification)
+			} else {
+				err = router.OutgoingRoute().Enqueue(notificationWithoutAcceptedTransactionIDs)
+			}
+
 			if err != nil {
 				return err
 			}
@@ -107,6 +122,18 @@ func (nm *NotificationManager) NotifyVirtualSelectedParentChainChanged(notificat
 	return nil
 }
 
+// AllListenersThatPropagateVirtualSelectedParentChainChanged returns true if there's any listener that is
+// subscribed to VirtualSelectedParentChainChanged notifications.
+func (nm *NotificationManager) AllListenersThatPropagateVirtualSelectedParentChainChanged() []*NotificationListener {
+	var listenersThatPropagate []*NotificationListener
+	for _, listener := range nm.listeners {
+		if listener.propagateVirtualSelectedParentChainChangedNotifications {
+			listenersThatPropagate = append(listenersThatPropagate, listener)
+		}
+	}
+	return listenersThatPropagate
+}
+
 // NotifyFinalityConflict notifies the notification manager that there's a finality conflict in the DAG
 func (nm *NotificationManager) NotifyFinalityConflict(notification *appmessage.FinalityConflictNotificationMessage) error {
 	nm.RLock()
@@ -251,6 +278,12 @@ func newNotificationListener() *NotificationListener {
 	}
 }
 
+// IncludeAcceptedTransactionIDsInVirtualSelectedParentChainChangedNotifications returns true if this listener
+// includes accepted transaction IDs in it's virtual-selected-parent-chain-changed notifications
+func (nl *NotificationListener) IncludeAcceptedTransactionIDsInVirtualSelectedParentChainChangedNotifications() bool {
+	return nl.includeAcceptedTransactionIDsInVirtualSelectedParentChainChangedNotifications
+}
+
 // PropagateBlockAddedNotifications instructs the listener to send block added notifications
 // to the remote listener
 func (nl *NotificationListener) PropagateBlockAddedNotifications() {
@@ -259,8 +292,9 @@ func (nl *NotificationListener) PropagateBlockAddedNotifications() {
 
 // PropagateVirtualSelectedParentChainChangedNotifications instructs the listener to send chain changed notifications
 // to the remote listener
-func (nl *NotificationListener) PropagateVirtualSelectedParentChainChangedNotifications() {
+func (nl *NotificationListener) PropagateVirtualSelectedParentChainChangedNotifications(includeAcceptedTransactionIDs bool) {
 	nl.propagateVirtualSelectedParentChainChangedNotifications = true
+	nl.includeAcceptedTransactionIDsInVirtualSelectedParentChainChangedNotifications = includeAcceptedTransactionIDs
 }
 
 // PropagateFinalityConflictNotifications instructs the listener to send finality conflict notifications

app/rpc/rpchandlers/get_virtual_selected_parent_chain_from_block.go

@@ -26,12 +26,14 @@ func HandleGetVirtualSelectedParentChainFromBlock(context *rpccontext.Context, _
 		return response, nil
 	}
 
-	chainChangedNotification, err := context.ConvertVirtualSelectedParentChainChangesToChainChangedNotificationMessage(virtualSelectedParentChain)
+	chainChangedNotification, err := context.ConvertVirtualSelectedParentChainChangesToChainChangedNotificationMessage(
+		virtualSelectedParentChain, getVirtualSelectedParentChainFromBlockRequest.IncludeAcceptedTransactionIDs)
 	if err != nil {
 		return nil, err
 	}
 
 	response := appmessage.NewGetVirtualSelectedParentChainFromBlockResponseMessage(
-		chainChangedNotification.RemovedChainBlockHashes, chainChangedNotification.AddedChainBlockHashes)
+		chainChangedNotification.RemovedChainBlockHashes, chainChangedNotification.AddedChainBlockHashes,
+		chainChangedNotification.AcceptedTransactionIDs)
 	return response, nil
 }

app/rpc/rpchandlers/notify_virtual_selected_parent_chain_changed.go

@@ -7,12 +7,17 @@ import (
 )
 
 // HandleNotifyVirtualSelectedParentChainChanged handles the respectively named RPC command
-func HandleNotifyVirtualSelectedParentChainChanged(context *rpccontext.Context, router *router.Router, _ appmessage.Message) (appmessage.Message, error) {
+func HandleNotifyVirtualSelectedParentChainChanged(context *rpccontext.Context, router *router.Router,
+	request appmessage.Message) (appmessage.Message, error) {
+
+	notifyVirtualSelectedParentChainChangedRequest := request.(*appmessage.NotifyVirtualSelectedParentChainChangedRequestMessage)
+
 	listener, err := context.NotificationManager.Listener(router)
 	if err != nil {
 		return nil, err
 	}
-	listener.PropagateVirtualSelectedParentChainChangedNotifications()
+	listener.PropagateVirtualSelectedParentChainChangedNotifications(
+		notifyVirtualSelectedParentChainChangedRequest.IncludeAcceptedTransactionIDs)
 
 	response := appmessage.NewNotifyVirtualSelectedParentChainChangedResponseMessage()
 	return response, nil

infrastructure/network/netadapter/server/grpcserver/protowire/messages.pb.go

@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.26.0
-// 	protoc        v3.17.2
+// 	protoc        v3.12.3
 // source: messages.proto
 
 package protowire

infrastructure/network/netadapter/server/grpcserver/protowire/messages_grpc.pb.go

@@ -1,8 +1,4 @@
 // Code generated by protoc-gen-go-grpc. DO NOT EDIT.
-// versions:
-// - protoc-gen-go-grpc v1.2.0
-// - protoc             v3.17.2
-// source: messages.proto
 
 package protowire
 

infrastructure/network/netadapter/server/grpcserver/protowire/p2p.pb.go

@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.26.0
-// 	protoc        v3.17.2
+// 	protoc        v3.12.3
 // source: p2p.proto
 
 package protowire

infrastructure/network/netadapter/server/grpcserver/protowire/rpc.proto

@@ -301,6 +301,7 @@ message SubmitTransactionResponseMessage{
 //
 // See: VirtualSelectedParentChainChangedNotificationMessage
 message NotifyVirtualSelectedParentChainChangedRequestMessage{
+  bool includeAcceptedTransactionIds = 1;
 }
 
 message NotifyVirtualSelectedParentChainChangedResponseMessage{
@@ -317,6 +318,9 @@ message VirtualSelectedParentChainChangedNotificationMessage{
 
   // The chain blocks that were added, in low-to-high order
   repeated string addedChainBlockHashes = 3;
+
+  // Will be filled only if `includeAcceptedTransactionIds = true` in the notify request.
+  repeated AcceptedTransactionIds acceptedTransactionIds = 2;
 }
 
 // GetBlockRequestMessage requests information about a specific block
@@ -349,6 +353,12 @@ message GetSubnetworkResponseMessage{
 // parent chain from some startHash to this kaspad's current virtual
 message GetVirtualSelectedParentChainFromBlockRequestMessage{
   string startHash = 1;
+  bool includeAcceptedTransactionIds = 2;
+}
+
+message AcceptedTransactionIds{
+  string acceptingBlockHash = 1;
+  repeated string acceptedTransactionIds = 2;
 }
 
 message GetVirtualSelectedParentChainFromBlockResponseMessage{
@@ -358,6 +368,10 @@ message GetVirtualSelectedParentChainFromBlockResponseMessage{
   // The chain blocks that were added, in low-to-high order
   repeated string addedChainBlockHashes = 3;
 
+  // The transactions accepted by each block in addedChainBlockHashes.
+  // Will be filled only if `includeAcceptedTransactionIds = true` in the request.
+  repeated AcceptedTransactionIds acceptedTransactionIds = 2;
+
   RPCError error = 1000;
 }
 

infrastructure/network/netadapter/server/grpcserver/protowire/rpc_get_virtual_selected_parent_chain_from_block.go

@@ -43,8 +43,13 @@ func (x *KaspadMessage_GetVirtualSelectedParentChainFromBlockResponse) fromAppMe
 	x.GetVirtualSelectedParentChainFromBlockResponse = &GetVirtualSelectedParentChainFromBlockResponseMessage{
 		RemovedChainBlockHashes: message.RemovedChainBlockHashes,
 		AddedChainBlockHashes:   message.AddedChainBlockHashes,
+		AcceptedTransactionIds:  make([]*AcceptedTransactionIds, len(message.AcceptedTransactionIDs)),
 		Error:                   err,
 	}
+	for i, acceptedTransactionIDs := range message.AcceptedTransactionIDs {
+		x.GetVirtualSelectedParentChainFromBlockResponse.AcceptedTransactionIds[i] = &AcceptedTransactionIds{}
+		x.GetVirtualSelectedParentChainFromBlockResponse.AcceptedTransactionIds[i].fromAppMessage(acceptedTransactionIDs)
+	}
 	return nil
 }
 
@@ -62,9 +67,28 @@ func (x *GetVirtualSelectedParentChainFromBlockResponseMessage) toAppMessage() (
 		return nil, errors.New("GetVirtualSelectedParentChainFromBlockResponseMessage contains both an error and a response")
 	}
 
-	return &appmessage.GetVirtualSelectedParentChainFromBlockResponseMessage{
+	message := &appmessage.GetVirtualSelectedParentChainFromBlockResponseMessage{
 		RemovedChainBlockHashes: x.RemovedChainBlockHashes,
 		AddedChainBlockHashes:   x.AddedChainBlockHashes,
+		AcceptedTransactionIDs:  make([]*appmessage.AcceptedTransactionIDs, len(x.AcceptedTransactionIds)),
 		Error:                   rpcErr,
-	}, nil
+	}
+
+	for i, acceptedTransactionIds := range x.AcceptedTransactionIds {
+		message.AcceptedTransactionIDs[i] = acceptedTransactionIds.toAppMessage()
+	}
+
+	return message, nil
+}
+
+func (x *AcceptedTransactionIds) fromAppMessage(acceptedTransactionIDs *appmessage.AcceptedTransactionIDs) {
+	x.AcceptingBlockHash = acceptedTransactionIDs.AcceptingBlockHash
+	x.AcceptedTransactionIds = acceptedTransactionIDs.AcceptedTransactionIDs
+}
+
+func (x *AcceptedTransactionIds) toAppMessage() *appmessage.AcceptedTransactionIDs {
+	return &appmessage.AcceptedTransactionIDs{
+		AcceptingBlockHash:     x.AcceptingBlockHash,
+		AcceptedTransactionIDs: x.AcceptedTransactionIds,
+	}
 }

infrastructure/network/netadapter/server/grpcserver/protowire/rpc_notify_virtual_selected_parent_chain_changed.go

@@ -9,11 +9,15 @@ func (x *KaspadMessage_NotifyVirtualSelectedParentChainChangedRequest) toAppMess
 	if x == nil {
 		return nil, errors.Wrapf(errorNil, "KaspadMessage_NotifyVirtualSelectedParentChainChangedRequest is nil")
 	}
-	return &appmessage.NotifyVirtualSelectedParentChainChangedRequestMessage{}, nil
+	return &appmessage.NotifyVirtualSelectedParentChainChangedRequestMessage{
+		IncludeAcceptedTransactionIDs: x.NotifyVirtualSelectedParentChainChangedRequest.IncludeAcceptedTransactionIds,
+	}, nil
 }
 
-func (x *KaspadMessage_NotifyVirtualSelectedParentChainChangedRequest) fromAppMessage(_ *appmessage.NotifyVirtualSelectedParentChainChangedRequestMessage) error {
-	x.NotifyVirtualSelectedParentChainChangedRequest = &NotifyVirtualSelectedParentChainChangedRequestMessage{}
+func (x *KaspadMessage_NotifyVirtualSelectedParentChainChangedRequest) fromAppMessage(appmessage *appmessage.NotifyVirtualSelectedParentChainChangedRequestMessage) error {
+	x.NotifyVirtualSelectedParentChainChangedRequest = &NotifyVirtualSelectedParentChainChangedRequestMessage{
+		IncludeAcceptedTransactionIds: appmessage.IncludeAcceptedTransactionIDs,
+	}
 	return nil
 }
 
@@ -60,6 +64,12 @@ func (x *KaspadMessage_VirtualSelectedParentChainChangedNotification) fromAppMes
 	x.VirtualSelectedParentChainChangedNotification = &VirtualSelectedParentChainChangedNotificationMessage{
 		RemovedChainBlockHashes: message.RemovedChainBlockHashes,
 		AddedChainBlockHashes:   message.AddedChainBlockHashes,
+		AcceptedTransactionIds:  make([]*AcceptedTransactionIds, len(message.AcceptedTransactionIDs)),
+	}
+
+	for i, acceptedTransactionIDs := range message.AcceptedTransactionIDs {
+		x.VirtualSelectedParentChainChangedNotification.AcceptedTransactionIds[i] = &AcceptedTransactionIds{}
+		x.VirtualSelectedParentChainChangedNotification.AcceptedTransactionIds[i].fromAppMessage(acceptedTransactionIDs)
 	}
 	return nil
 }
@@ -68,8 +78,14 @@ func (x *VirtualSelectedParentChainChangedNotificationMessage) toAppMessage() (a
 	if x == nil {
 		return nil, errors.Wrapf(errorNil, "VirtualSelectedParentChainChangedNotificationMessage is nil")
 	}
-	return &appmessage.VirtualSelectedParentChainChangedNotificationMessage{
+	message := &appmessage.VirtualSelectedParentChainChangedNotificationMessage{
 		RemovedChainBlockHashes: x.RemovedChainBlockHashes,
 		AddedChainBlockHashes:   x.AddedChainBlockHashes,
-	}, nil
+		AcceptedTransactionIDs:  make([]*appmessage.AcceptedTransactionIDs, len(x.AcceptedTransactionIds)),
+	}
+
+	for i, acceptedTransactionIds := range x.AcceptedTransactionIds {
+		message.AcceptedTransactionIDs[i] = acceptedTransactionIds.toAppMessage()
+	}
+	return message, nil
 }

infrastructure/network/rpcclient/rpc_get_chain_from_block.go

@@ -3,8 +3,10 @@ package rpcclient
 import "github.com/kaspanet/kaspad/app/appmessage"
 
 // GetVirtualSelectedParentChainFromBlock sends an RPC request respective to the function's name and returns the RPC server's response
-func (c *RPCClient) GetVirtualSelectedParentChainFromBlock(startHash string) (*appmessage.GetVirtualSelectedParentChainFromBlockResponseMessage, error) {
-	err := c.rpcRouter.outgoingRoute().Enqueue(appmessage.NewGetVirtualSelectedParentChainFromBlockRequestMessage(startHash))
+func (c *RPCClient) GetVirtualSelectedParentChainFromBlock(startHash string, includeAcceptedTransactionIDs bool) (
+	*appmessage.GetVirtualSelectedParentChainFromBlockResponseMessage, error) {
+	err := c.rpcRouter.outgoingRoute().Enqueue(
+		appmessage.NewGetVirtualSelectedParentChainFromBlockRequestMessage(startHash, includeAcceptedTransactionIDs))
 	if err != nil {
 		return nil, err
 	}

infrastructure/network/rpcclient/rpc_on_chain_changed.go

@@ -8,8 +8,11 @@ import (
 
 // RegisterForVirtualSelectedParentChainChangedNotifications sends an RPC request respective to the function's name and returns the RPC server's response.
 // Additionally, it starts listening for the appropriate notification using the given handler function
-func (c *RPCClient) RegisterForVirtualSelectedParentChainChangedNotifications(onChainChanged func(notification *appmessage.VirtualSelectedParentChainChangedNotificationMessage)) error {
-	err := c.rpcRouter.outgoingRoute().Enqueue(appmessage.NewNotifyVirtualSelectedParentChainChangedRequestMessage())
+func (c *RPCClient) RegisterForVirtualSelectedParentChainChangedNotifications(includeAcceptedTransactionIDs bool,
+	onChainChanged func(notification *appmessage.VirtualSelectedParentChainChangedNotificationMessage)) error {
+
+	err := c.rpcRouter.outgoingRoute().Enqueue(
+		appmessage.NewNotifyVirtualSelectedParentChainChangedRequestMessage(includeAcceptedTransactionIDs))
 	if err != nil {
 		return err
 	}

testing/integration/selected_parent_chain_test.go

@@ -1,9 +1,10 @@
 package integration
 
 import (
-	"github.com/kaspanet/kaspad/domain/consensus/model/externalapi"
 	"testing"
 
+	"github.com/kaspanet/kaspad/domain/consensus/model/externalapi"
+
 	"github.com/kaspanet/kaspad/app/appmessage"
 	"github.com/kaspanet/kaspad/domain/consensus/utils/consensushashing"
 )
@@ -15,7 +16,7 @@ func TestVirtualSelectedParentChain(t *testing.T) {
 
 	// Register to virtual selected parent chain changes
 	onVirtualSelectedParentChainChangedChan := make(chan *appmessage.VirtualSelectedParentChainChangedNotificationMessage)
-	err := kaspad1.rpcClient.RegisterForVirtualSelectedParentChainChangedNotifications(
+	err := kaspad1.rpcClient.RegisterForVirtualSelectedParentChainChangedNotifications(true,
 		func(notification *appmessage.VirtualSelectedParentChainChangedNotificationMessage) {
 			onVirtualSelectedParentChainChangedChan <- notification
 		})
@@ -64,36 +65,10 @@ func TestVirtualSelectedParentChain(t *testing.T) {
 	chain2TipHashString := chain2TipHash.String()
 
 	// For the first `blockAmountToMine - 1` blocks we don't expect
-	// the chain to change at all
-	for i := 0; i < blockAmountToMine-1; i++ {
-		notification := <-onVirtualSelectedParentChainChangedChan
-		if len(notification.RemovedChainBlockHashes) > 0 {
-			t.Fatalf("RemovedChainBlockHashes is unexpectedly not empty")
-		}
-		if len(notification.AddedChainBlockHashes) > 0 {
-			t.Fatalf("AddedChainBlockHashes is unexpectedly not empty")
-		}
-	}
+	// the chain to change at all, thus there will be no notifications
 
-	// Either the next block could cause a reorg or the one
-	// after it
-	potentialReorgNotification1 := <-onVirtualSelectedParentChainChangedChan
-	potentialReorgNotification2 := <-onVirtualSelectedParentChainChangedChan
-	var reorgNotification *appmessage.VirtualSelectedParentChainChangedNotificationMessage
-	var nonReorgNotification *appmessage.VirtualSelectedParentChainChangedNotificationMessage
-	if len(potentialReorgNotification1.RemovedChainBlockHashes) > 0 {
-		reorgNotification = potentialReorgNotification1
-		nonReorgNotification = potentialReorgNotification2
-	} else {
-		reorgNotification = potentialReorgNotification2
-		nonReorgNotification = potentialReorgNotification1
-	}
-
-	// Make sure that the non-reorg notification has nothing
-	// in `removed`
-	if len(nonReorgNotification.RemovedChainBlockHashes) > 0 {
-		t.Fatalf("nonReorgNotification.RemovedChainBlockHashes is unexpectedly not empty")
-	}
+	// Either the next block or the one after it will cause a reorg
+	reorgNotification := <-onVirtualSelectedParentChainChangedChan
 
 	// Make sure that the reorg notification contains exactly
 	// `blockAmountToMine` blocks in its `removed`
@@ -104,7 +79,8 @@ func TestVirtualSelectedParentChain(t *testing.T) {
 
 	// Get the virtual selected parent chain from the tip of
 	// the first chain
-	virtualSelectedParentChainFromChain1Tip, err := kaspad1.rpcClient.GetVirtualSelectedParentChainFromBlock(chain1TipHashString)
+	virtualSelectedParentChainFromChain1Tip, err := kaspad1.rpcClient.GetVirtualSelectedParentChainFromBlock(
+		chain1TipHashString, true)
 	if err != nil {
 		t.Fatalf("GetVirtualSelectedParentChainFromBlock failed: %s", err)
 	}