feat: expose previous block hash in block interface (#798)

Fixes #797

Author: agaffney

ledger/allegra/allegra.go

@@ -68,6 +68,10 @@ func (b *AllegraBlock) Hash() string {
 	return b.Header.Hash()
 }
 
+func (b *AllegraBlock) PrevHash() string {
+	return b.Header.PrevHash()
+}
+
 func (b *AllegraBlock) BlockNumber() uint64 {
 	return b.Header.BlockNumber()
 }

ledger/alonzo/alonzo.go

@@ -71,6 +71,10 @@ func (b *AlonzoBlock) Hash() string {
 	return b.Header.Hash()
 }
 
+func (b *AlonzoBlock) PrevHash() string {
+	return b.Header.PrevHash()
+}
+
 func (b *AlonzoBlock) BlockNumber() uint64 {
 	return b.Header.BlockNumber()
 }

ledger/babbage/babbage.go

@@ -72,6 +72,10 @@ func (b *BabbageBlock) Hash() string {
 	return b.Header.Hash()
 }
 
+func (b *BabbageBlock) PrevHash() string {
+	return b.Header.PrevHash()
+}
+
 func (b *BabbageBlock) BlockNumber() uint64 {
 	return b.Header.BlockNumber()
 }
@@ -174,6 +178,10 @@ func (h *BabbageBlockHeader) Hash() string {
 	return h.hash
 }
 
+func (h *BabbageBlockHeader) PrevHash() string {
+	return h.Body.PrevHash.String()
+}
+
 func (h *BabbageBlockHeader) BlockNumber() uint64 {
 	return h.Body.BlockNumber
 }

ledger/block.go

@@ -29,6 +29,7 @@ type Block interface {
 
 type BlockHeader interface {
 	Hash() string
+	PrevHash() string
 	BlockNumber() uint64
 	SlotNumber() uint64
 	IssuerVkey() IssuerVkey

ledger/byron/byron.go

@@ -101,6 +101,10 @@ func (h *ByronMainBlockHeader) Hash() string {
 	return h.hash
 }
 
+func (h *ByronMainBlockHeader) PrevHash() string {
+	return h.PrevBlock.String()
+}
+
 func (h *ByronMainBlockHeader) BlockNumber() uint64 {
 	// Byron blocks don't store the block number in the block
 	return 0
@@ -525,6 +529,10 @@ func (h *ByronEpochBoundaryBlockHeader) Hash() string {
 	return h.hash
 }
 
+func (h *ByronEpochBoundaryBlockHeader) PrevHash() string {
+	return h.PrevBlock.String()
+}
+
 func (h *ByronEpochBoundaryBlockHeader) BlockNumber() uint64 {
 	// Byron blocks don't store the block number in the block
 	return 0
@@ -569,6 +577,10 @@ func (b *ByronMainBlock) Hash() string {
 	return b.Header.Hash()
 }
 
+func (b *ByronMainBlock) PrevHash() string {
+	return b.Header.PrevHash()
+}
+
 func (b *ByronMainBlock) BlockNumber() uint64 {
 	return b.Header.BlockNumber()
 }
@@ -623,6 +635,10 @@ func (b *ByronEpochBoundaryBlock) Hash() string {
 	return b.Header.Hash()
 }
 
+func (b *ByronEpochBoundaryBlock) PrevHash() string {
+	return b.Header.PrevHash()
+}
+
 func (b *ByronEpochBoundaryBlock) BlockNumber() uint64 {
 	return b.Header.BlockNumber()
 }

ledger/conway/conway.go

@@ -71,6 +71,10 @@ func (b *ConwayBlock) Hash() string {
 	return b.Header.Hash()
 }
 
+func (b *ConwayBlock) PrevHash() string {
+	return b.Header.PrevHash()
+}
+
 func (b *ConwayBlock) BlockNumber() uint64 {
 	return b.Header.BlockNumber()
 }

ledger/mary/mary.go

@@ -70,6 +70,10 @@ func (b *MaryBlock) Hash() string {
 	return b.Header.Hash()
 }
 
+func (b *MaryBlock) PrevHash() string {
+	return b.Header.PrevHash()
+}
+
 func (b *MaryBlock) BlockNumber() uint64 {
 	return b.Header.BlockNumber()
 }

ledger/shelley/shelley.go

@@ -67,6 +67,10 @@ func (b *ShelleyBlock) Hash() string {
 	return b.Header.Hash()
 }
 
+func (b *ShelleyBlock) PrevHash() string {
+	return b.Header.PrevHash()
+}
+
 func (b *ShelleyBlock) BlockNumber() uint64 {
 	return b.Header.BlockNumber()
 }
@@ -158,6 +162,10 @@ func (h *ShelleyBlockHeader) Hash() string {
 	return h.hash
 }
 
+func (h *ShelleyBlockHeader) PrevHash() string {
+	return h.Body.PrevHash.String()
+}
+
 func (h *ShelleyBlockHeader) BlockNumber() uint64 {
 	return h.Body.BlockNumber
 }