fix: check for nil TX pparam updates (#1078)

Fixes #1077

Signed-off-by: Aurora Gaffney <[email protected]>

Author: agaffney

ledger/allegra/allegra.go

@@ -203,6 +203,9 @@ func (b *AllegraTransactionBody) ValidityIntervalStart() uint64 {
 }
 
 func (b *AllegraTransactionBody) ProtocolParameterUpdates() (uint64, map[common.Blake2b224]common.ProtocolParameterUpdate) {
+	if b.Update == nil {
+		return 0, nil
+	}
 	updateMap := make(map[common.Blake2b224]common.ProtocolParameterUpdate)
 	for k, v := range b.Update.ProtocolParamUpdates {
 		updateMap[k] = v

ledger/alonzo/alonzo.go

@@ -217,6 +217,9 @@ func (b *AlonzoTransactionBody) ValidityIntervalStart() uint64 {
 }
 
 func (b *AlonzoTransactionBody) ProtocolParameterUpdates() (uint64, map[common.Blake2b224]common.ProtocolParameterUpdate) {
+	if b.Update == nil {
+		return 0, nil
+	}
 	updateMap := make(map[common.Blake2b224]common.ProtocolParameterUpdate)
 	for k, v := range b.Update.ProtocolParamUpdates {
 		updateMap[k] = v

ledger/babbage/babbage.go

@@ -293,6 +293,9 @@ func (b *BabbageTransactionBody) ValidityIntervalStart() uint64 {
 }
 
 func (b *BabbageTransactionBody) ProtocolParameterUpdates() (uint64, map[common.Blake2b224]common.ProtocolParameterUpdate) {
+	if b.Update == nil {
+		return 0, nil
+	}
 	updateMap := make(map[common.Blake2b224]common.ProtocolParameterUpdate)
 	for k, v := range b.Update.ProtocolParamUpdates {
 		updateMap[k] = v

ledger/conway/conway.go

@@ -402,6 +402,9 @@ func (b *ConwayTransactionBody) ValidityIntervalStart() uint64 {
 }
 
 func (b *ConwayTransactionBody) ProtocolParameterUpdates() (uint64, map[common.Blake2b224]common.ProtocolParameterUpdate) {
+	if b.Update == nil {
+		return 0, nil
+	}
 	updateMap := make(map[common.Blake2b224]common.ProtocolParameterUpdate)
 	for k, v := range b.Update.ProtocolParamUpdates {
 		updateMap[k] = v

ledger/mary/mary.go

@@ -205,6 +205,9 @@ func (b *MaryTransactionBody) ValidityIntervalStart() uint64 {
 }
 
 func (b *MaryTransactionBody) ProtocolParameterUpdates() (uint64, map[common.Blake2b224]common.ProtocolParameterUpdate) {
+	if b.Update == nil {
+		return 0, nil
+	}
 	updateMap := make(map[common.Blake2b224]common.ProtocolParameterUpdate)
 	for k, v := range b.Update.ProtocolParamUpdates {
 		updateMap[k] = v

ledger/shelley/shelley.go

@@ -261,6 +261,9 @@ func (b *ShelleyTransactionBody) TTL() uint64 {
 }
 
 func (b *ShelleyTransactionBody) ProtocolParameterUpdates() (uint64, map[common.Blake2b224]common.ProtocolParameterUpdate) {
+	if b.Update == nil {
+		return 0, nil
+	}
 	updateMap := make(map[common.Blake2b224]common.ProtocolParameterUpdate)
 	for k, v := range b.Update.ProtocolParamUpdates {
 		updateMap[k] = v