feat: use pointer for TX metadata to better handle nil value

cmd/block-fetch/main.go

@@ -89,7 +89,7 @@ func main() {
 		fmt.Printf("\nTransactions:\n")
 		for _, tx := range block.Transactions() {
 			fmt.Printf("  Hash: %s\n", tx.Hash())
-			if tx.Metadata().Value() != nil {
+			if tx.Metadata() != nil {
 				fmt.Printf("  Metadata:\n    %#v (%x)\n", tx.Metadata().Value(), tx.Metadata().Cbor())
 			}
 			fmt.Printf("  Inputs:\n")

ledger/allegra.go

@@ -36,7 +36,7 @@ type AllegraBlock struct {
 	Header                 *AllegraBlockHeader
 	TransactionBodies      []AllegraTransactionBody
 	TransactionWitnessSets []ShelleyTransactionWitnessSet
-	TransactionMetadataSet map[uint]cbor.Value
+	TransactionMetadataSet map[uint]*cbor.Value
 }
 
 func (b *AllegraBlock) UnmarshalCBOR(cborData []byte) error {
@@ -94,7 +94,7 @@ type AllegraTransaction struct {
 	cbor.DecodeStoreCbor
 	Body       AllegraTransactionBody
 	WitnessSet ShelleyTransactionWitnessSet
-	TxMetadata cbor.Value
+	TxMetadata *cbor.Value
 }
 
 func (t AllegraTransaction) Hash() string {
@@ -109,7 +109,7 @@ func (t AllegraTransaction) Outputs() []TransactionOutput {
 	return t.Body.Outputs()
 }
 
-func (t AllegraTransaction) Metadata() cbor.Value {
+func (t AllegraTransaction) Metadata() *cbor.Value {
 	return t.TxMetadata
 }
 

ledger/alonzo.go

@@ -37,7 +37,7 @@ type AlonzoBlock struct {
 	Header                 *AlonzoBlockHeader
 	TransactionBodies      []AlonzoTransactionBody
 	TransactionWitnessSets []AlonzoTransactionWitnessSet
-	TransactionMetadataSet map[uint]cbor.Value
+	TransactionMetadataSet map[uint]*cbor.Value
 	InvalidTransactions    []uint
 }
 
@@ -182,7 +182,7 @@ type AlonzoTransaction struct {
 	Body       AlonzoTransactionBody
 	WitnessSet AlonzoTransactionWitnessSet
 	IsValid    bool
-	TxMetadata cbor.Value
+	TxMetadata *cbor.Value
 }
 
 func (t AlonzoTransaction) Hash() string {
@@ -197,7 +197,7 @@ func (t AlonzoTransaction) Outputs() []TransactionOutput {
 	return t.Body.Outputs()
 }
 
-func (t AlonzoTransaction) Metadata() cbor.Value {
+func (t AlonzoTransaction) Metadata() *cbor.Value {
 	return t.TxMetadata
 }
 

ledger/babbage.go

@@ -37,7 +37,7 @@ type BabbageBlock struct {
 	Header                 *BabbageBlockHeader
 	TransactionBodies      []BabbageTransactionBody
 	TransactionWitnessSets []BabbageTransactionWitnessSet
-	TransactionMetadataSet map[uint]cbor.Value
+	TransactionMetadataSet map[uint]*cbor.Value
 	InvalidTransactions    []uint
 }
 
@@ -295,7 +295,7 @@ type BabbageTransaction struct {
 	Body       BabbageTransactionBody
 	WitnessSet BabbageTransactionWitnessSet
 	IsValid    bool
-	TxMetadata cbor.Value
+	TxMetadata *cbor.Value
 }
 
 func (t BabbageTransaction) Hash() string {
@@ -310,7 +310,7 @@ func (t BabbageTransaction) Outputs() []TransactionOutput {
 	return t.Body.Outputs()
 }
 
-func (t BabbageTransaction) Metadata() cbor.Value {
+func (t BabbageTransaction) Metadata() *cbor.Value {
 	return t.TxMetadata
 }
 

ledger/byron.go

@@ -105,7 +105,7 @@ type ByronTransaction struct {
 	// TODO: flesh these out
 	TxInputs   []any
 	TxOutputs  []any
-	Attributes cbor.Value
+	Attributes *cbor.Value
 }
 
 func (t *ByronTransaction) Hash() string {
@@ -123,7 +123,7 @@ func (t *ByronTransaction) Outputs() []TransactionOutput {
 	return nil
 }
 
-func (t *ByronTransaction) Metadata() cbor.Value {
+func (t *ByronTransaction) Metadata() *cbor.Value {
 	return t.Attributes
 }
 

ledger/mary.go

@@ -37,7 +37,7 @@ type MaryBlock struct {
 	Header                 *MaryBlockHeader
 	TransactionBodies      []MaryTransactionBody
 	TransactionWitnessSets []ShelleyTransactionWitnessSet
-	TransactionMetadataSet map[uint]cbor.Value
+	TransactionMetadataSet map[uint]*cbor.Value
 }
 
 func (b *MaryBlock) UnmarshalCBOR(cborData []byte) error {
@@ -104,7 +104,7 @@ type MaryTransaction struct {
 	cbor.DecodeStoreCbor
 	Body       MaryTransactionBody
 	WitnessSet ShelleyTransactionWitnessSet
-	TxMetadata cbor.Value
+	TxMetadata *cbor.Value
 }
 
 func (t MaryTransaction) Hash() string {
@@ -119,7 +119,7 @@ func (t MaryTransaction) Outputs() []TransactionOutput {
 	return t.Body.Outputs()
 }
 
-func (t MaryTransaction) Metadata() cbor.Value {
+func (t MaryTransaction) Metadata() *cbor.Value {
 	return t.TxMetadata
 }
 

ledger/shelley.go

@@ -36,7 +36,7 @@ type ShelleyBlock struct {
 	Header                 *ShelleyBlockHeader
 	TransactionBodies      []ShelleyTransactionBody
 	TransactionWitnessSets []ShelleyTransactionWitnessSet
-	TransactionMetadataSet map[uint]cbor.Value
+	TransactionMetadataSet map[uint]*cbor.Value
 }
 
 func (b *ShelleyBlock) UnmarshalCBOR(cborData []byte) error {
@@ -227,7 +227,7 @@ type ShelleyTransaction struct {
 	cbor.DecodeStoreCbor
 	Body       ShelleyTransactionBody
 	WitnessSet ShelleyTransactionWitnessSet
-	TxMetadata cbor.Value
+	TxMetadata *cbor.Value
 }
 
 func (t ShelleyTransaction) Hash() string {
@@ -242,7 +242,7 @@ func (t ShelleyTransaction) Outputs() []TransactionOutput {
 	return t.Body.Outputs()
 }
 
-func (t ShelleyTransaction) Metadata() cbor.Value {
+func (t ShelleyTransaction) Metadata() *cbor.Value {
 	return t.TxMetadata
 }
 

ledger/tx.go

@@ -24,7 +24,7 @@ import (
 
 type Transaction interface {
 	TransactionBody
-	Metadata() cbor.Value
+	Metadata() *cbor.Value
 }
 
 type TransactionBody interface {