add prev_hash to logging

cmd/ingest/main.go

@@ -217,6 +217,7 @@ func handleBlock(db *sql.DB, block *parser.Block) {
 	entry := log.WithFields(logrus.Fields{
 		"block_height":  block.GetHeight(),
 		"block_hash":    hex.EncodeToString(block.GetDisplayHash()),
+		"prev_hash":     hex.EncodeToString(block.GetDisplayPrevHash()),
 		"block_version": block.GetVersion(),
 		"tx_count":      block.GetTxCount(),
 		"sapling":       block.HasSaplingTransactions(),

parser/block.go

@@ -43,6 +43,16 @@ func (b *Block) GetEncodableHash() []byte {
 	return b.hdr.GetEncodableHash()
 }
 
+func (b *Block) GetDisplayPrevHash() []byte {
+	h := b.hdr.HashPrevBlock
+	// Reverse byte order
+	for i := 0; i < len(h)/2; i++ {
+		j := len(h) - 1 - i
+		h[i], h[j] = h[j], h[i]
+	}
+	return h
+}
+
 func (b *Block) HasSaplingTransactions() bool {
 	for _, tx := range b.vtx {
 		if tx.HasSaplingTransactions() {