(VDB-298) Consume Pit contract storage diffs

- Continuously parse storage diffs CSV data to read Pit contract state
- Convert ilks in database to raw bytes32 value for use in generating
  storage keys dynamically
- Persist storage diffs with block number and hash for validation

pkg/transformers/shared/storage/transformer.go

@@ -0,0 +1,14 @@
+package storage
+
+import (
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/storage_diffs/shared"
+)
+
+type Transformer interface {
+	Execute(row shared.StorageDiffRow) error
+	ContractAddress() common.Address
+}
+
+type TransformerInitializer func(db *postgres.DB) Transformer

pkg/transformers/shared/utilities.go

@@ -17,6 +17,7 @@
 package shared
 
 import (
+	"github.com/ethereum/go-ethereum/common"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared/constants"
 	"math/big"
 )
@@ -59,6 +60,10 @@ func GetDataBytesAtIndex(n int, logData []byte) []byte {
 	return []byte{}
 }
 
+func GetHexWithoutPrefix(raw []byte) string {
+	return common.Bytes2Hex(raw)
+}
+
 func ConvertToRay(value string) string {
 	return convert(ray, value, rayPrecision)
 }

pkg/transformers/shared/utilities_test.go

@@ -62,4 +62,12 @@ var _ = Describe("Shared utilities", func() {
 			Expect(wadTwo).To(Equal("1.234567890123456690"))
 		})
 	})
+
+	Describe("getting hex without prefix", func() {
+		It("returns bytes as hex without 0x prefix", func() {
+			raw := common.HexToHash("0x4554480000000000000000000000000000000000000000000000000000000000").Bytes()
+			result := shared.GetHexWithoutPrefix(raw)
+			Expect(result).To(Equal("4554480000000000000000000000000000000000000000000000000000000000"))
+		})
+	})
 })