storage: begin implementing sqlite3 storage

parser/block.go

@@ -35,6 +35,15 @@ func (b *block) getEncodableHash() []byte {
 	return b.hdr.getEncodableHash()
 }
 
+func (b *block) HasSaplingTransactions() bool {
+	for _, tx := range b.vtx {
+		if tx.HasSaplingTransactions() {
+			return true
+		}
+	}
+	return false
+}
+
 // GetHeight() extracts the block height from the coinbase transaction. See
 // BIP34. Returns block height on success, or -1 on error.
 func (b *block) GetHeight() int {

parser/block_test.go

@@ -6,7 +6,6 @@ import (
 	"encoding/json"
 	"fmt"
 	"io/ioutil"
-	"log"
 	"os"
 	"testing"
 
@@ -57,12 +56,12 @@ func TestCompactBlocks(t *testing.T) {
 
 	blockJSON, err := ioutil.ReadFile("testdata/compact_blocks.json")
 	if err != nil {
-		log.Fatal(err)
+		t.Fatal(err)
 	}
 
 	err = json.Unmarshal(blockJSON, &compactTests)
 	if err != nil {
-		log.Fatal(err)
+		t.Fatal(err)
 	}
 
 	for _, test := range compactTests {

parser/transaction.go

@@ -296,6 +296,10 @@ func (tx *transaction) getEncodableHash() []byte {
 	return digest[:]
 }
 
+func (tx *transaction) HasSaplingTransactions() bool {
+	return tx.version >= 4 && (len(tx.shieldedSpends)+len(tx.shieldedOutputs)) > 0
+}
+
 func (tx *transaction) ToCompact(index int) *proto.CompactTx {
 	ctx := &proto.CompactTx{
 		Index:   uint64(index), // index is contextual