fix: Babbage block parsing

* don't try to parse arbitrary plutus scripts/data * add missing transaction witness set field * better support alternate transaction output format * update Babbage intersect point for preview in test program Fixes #204
blinklabs-io · Mar 8, 2023 · 3a1adfb · 3a1adfb
1 parent 92dd606
commit 3a1adfb
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Showing 4 changed files with 66 additions and 13 deletions.
diff --git a/cmd/go-ouroboros-network/chainsync.go b/cmd/go-ouroboros-network/chainsync.go
@@ -74,7 +74,7 @@ var eraIntersect = map[string]map[string][]interface{}{
 		"genesis": []interface{}{},
 		"alonzo":  []interface{}{},
 		// Last block of epoch 3 (Alonzo era)
-		"babbage": []interface{}{345599, "6e4de9c9b2dcc2436488aa8a6ce584250a45b42583c5d3d0749597bcf59dc0b5"},
+		"babbage": []interface{}{345594, "e47ac07272e95d6c3dc8279def7b88ded00e310f99ac3dfbae48ed9ff55e6001"},
 	},
 }
 

diff --git a/ledger/alonzo.go b/ledger/alonzo.go
@@ -64,6 +64,7 @@ func (h *AlonzoBlockHeader) Era() Era {
 
 type AlonzoTransactionBody struct {
 	MaryTransactionBody
+	Outputs         []AlonzoTransactionOutput `cbor:"1,keyasint,omitempty"`
 	ScriptDataHash  Blake2b256                `cbor:"11,keyasint,omitempty"`
 	Collateral      []ShelleyTransactionInput `cbor:"13,keyasint,omitempty"`
 	RequiredSigners []Blake2b224              `cbor:"14,keyasint,omitempty"`
@@ -74,11 +75,32 @@ func (b *AlonzoTransactionBody) UnmarshalCBOR(cborData []byte) error {
 	return b.UnmarshalCborGeneric(cborData, b)
 }
 
+type AlonzoTransactionOutput struct {
+	cbor.StructAsArray
+	cbor.DecodeStoreCbor
+	Address   Blake2b256
+	Amount    cbor.Value
+	DatumHash Blake2b256
+}
+
+func (o *AlonzoTransactionOutput) UnmarshalCBOR(cborData []byte) error {
+	// Try to parse as Mary output first
+	var tmpOutput MaryTransactionOutput
+	if _, err := cbor.Decode(cborData, &tmpOutput); err == nil {
+		// Copy from temp Shelley output to Alonzo format
+		o.Address = tmpOutput.Address
+		o.Amount = tmpOutput.Amount
+	} else {
+		return o.UnmarshalCborGeneric(cborData, o)
+	}
+	return nil
+}
+
 type AlonzoTransactionWitnessSet struct {
 	ShelleyTransactionWitnessSet
-	PlutusScripts interface{}  `cbor:"3,keyasint,omitempty"`
-	PlutusData    []cbor.Value `cbor:"4,keyasint,omitempty"`
-	Redeemers     []cbor.Value `cbor:"5,keyasint,omitempty"`
+	PlutusScripts []cbor.RawMessage `cbor:"3,keyasint,omitempty"`
+	PlutusData    []cbor.RawMessage `cbor:"4,keyasint,omitempty"`
+	Redeemers     []cbor.Value      `cbor:"5,keyasint,omitempty"`
 }
 
 type AlonzoTransaction struct {

diff --git a/ledger/babbage.go b/ledger/babbage.go
@@ -21,7 +21,7 @@ type BabbageBlock struct {
 	cbor.DecodeStoreCbor
 	Header                 *BabbageBlockHeader
 	TransactionBodies      []BabbageTransactionBody
-	TransactionWitnessSets []AlonzoTransactionWitnessSet
+	TransactionWitnessSets []BabbageTransactionWitnessSet
 	TransactionMetadataSet map[uint]cbor.Value
 	InvalidTransactions    []uint
 }
@@ -109,19 +109,48 @@ func (h *BabbageBlockHeader) Era() Era {
 
 type BabbageTransactionBody struct {
 	AlonzoTransactionBody
-	CollateralReturn ShelleyTransactionOutput  `cbor:"16,keyasint,omitempty"`
-	TotalCollateral  uint64                    `cbor:"17,keyasint,omitempty"`
-	ReferenceInputs  []ShelleyTransactionInput `cbor:"18,keyasint,omitempty"`
+	Outputs          []BabbageTransactionOutput `cbor:"1,keyasint,omitempty"`
+	CollateralReturn BabbageTransactionOutput   `cbor:"16,keyasint,omitempty"`
+	TotalCollateral  uint64                     `cbor:"17,keyasint,omitempty"`
+	ReferenceInputs  []ShelleyTransactionInput  `cbor:"18,keyasint,omitempty"`
 }
 
 func (b *BabbageTransactionBody) UnmarshalCBOR(cborData []byte) error {
 	return b.UnmarshalCborGeneric(cborData, b)
 }
 
+type BabbageTransactionOutput struct {
+	cbor.DecodeStoreCbor
+	Address      Blake2b256        `cbor:"0,keyasint,omitempty"`
+	Amount       cbor.Value        `cbor:"1,keyasint,omitempty"`
+	DatumOption  []cbor.RawMessage `cbor:"2,keyasint,omitempty"`
+	ScriptRef    []cbor.RawMessage `cbor:"3,keyasint,omitempty"`
+	legacyOutput bool
+}
+
+func (o *BabbageTransactionOutput) UnmarshalCBOR(cborData []byte) error {
+	// Try to parse as legacy output first
+	var tmpOutput AlonzoTransactionOutput
+	if _, err := cbor.Decode(cborData, &tmpOutput); err == nil {
+		// Copy from temp legacy object to Babbage format
+		o.Address = tmpOutput.Address
+		o.Amount = tmpOutput.Amount
+		o.legacyOutput = true
+	} else {
+		return o.UnmarshalCborGeneric(cborData, o)
+	}
+	return nil
+}
+
+type BabbageTransactionWitnessSet struct {
+	AlonzoTransactionWitnessSet
+	PlutusV2Scripts []cbor.RawMessage `cbor:"6,keyasint,omitempty"`
+}
+
 type BabbageTransaction struct {
 	cbor.StructAsArray
 	Body       BabbageTransactionBody
-	WitnessSet AlonzoTransactionWitnessSet
+	WitnessSet BabbageTransactionWitnessSet
 	IsValid    bool
 	Metadata   cbor.Value
 }

diff --git a/ledger/mary.go b/ledger/mary.go
@@ -63,8 +63,7 @@ func (h *MaryBlockHeader) Era() Era {
 
 type MaryTransactionBody struct {
 	AllegraTransactionBody
-	//Outputs []MaryTransactionOutput `cbor:"1,keyasint,omitempty"`
-	Outputs []cbor.Value `cbor:"1,keyasint,omitempty"`
+	Outputs []MaryTransactionOutput `cbor:"1,keyasint,omitempty"`
 	// TODO: further parsing of this field
 	Mint cbor.Value `cbor:"9,keyasint,omitempty"`
 }
@@ -85,9 +84,12 @@ type MaryTransaction struct {
 transaction_output = [address, amount : value]
 value = coin / [coin,multiasset<uint>]
 */
-//type MaryTransactionOutput interface{}
 
-type MaryTransactionOutput cbor.Value
+type MaryTransactionOutput struct {
+	cbor.StructAsArray
+	Address Blake2b256
+	Amount  cbor.Value
+}
 
 func NewMaryBlockFromCbor(data []byte) (*MaryBlock, error) {
 	var maryBlock MaryBlock