Rename handlers to transformers

libraries/shared/transformer_interface.go

@@ -0,0 +1,23 @@
+package shared
+
+import (
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/vulcanize/vulcanizedb/pkg/core"
+	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
+)
+
+type Transformer interface {
+	Execute() error
+}
+
+type TransformerInitializer func(db *postgres.DB, blockchain core.Blockchain) Transformer
+
+func HexToInt64(byteString string) int64 {
+	value := common.HexToHash(byteString)
+	return value.Big().Int64()
+}
+
+func HexToString(byteString string) string {
+	value := common.HexToHash(byteString)
+	return value.Big().String()
+}