Extract constants package

- Reduce clutter in the shared package

pkg/transformers/drip_file/ilk/config.go

@@ -14,13 +14,16 @@
 
 package ilk
 
-import "github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
+import (
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared/constants"
+)
 
 var DripFileIlkConfig = shared.TransformerConfig{
-	TransformerName:     shared.DripFileIlkLabel,
-	ContractAddresses:   []string{shared.DripContractAddress},
-	ContractAbi:         shared.DripABI,
-	Topic:               shared.DripFileIlkSignature,
+	TransformerName:     constants.DripFileIlkLabel,
+	ContractAddresses:   []string{constants.DripContractAddress},
+	ContractAbi:         constants.DripABI,
+	Topic:               constants.DripFileIlkSignature,
 	StartingBlockNumber: 0,
 	EndingBlockNumber:   10000000,
 }

pkg/transformers/drip_file/ilk/converter.go

@@ -17,11 +17,12 @@ package ilk
 import (
 	"bytes"
 	"encoding/json"
+	"errors"
 	"math/big"
 
-	"errors"
 	"github.com/ethereum/go-ethereum/core/types"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
+
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared/constants"
 )
 
 type DripFileIlkConverter struct{}
@@ -36,7 +37,7 @@ func (DripFileIlkConverter) ToModels(ethLogs []types.Log) ([]interface{}, error)
 
 		ilk := string(bytes.Trim(ethLog.Topics[2].Bytes(), "\x00"))
 		vow := string(bytes.Trim(ethLog.Topics[3].Bytes(), "\x00"))
-		taxBytes := ethLog.Data[len(ethLog.Data)-shared.DataItemLength:]
+		taxBytes := ethLog.Data[len(ethLog.Data)-constants.DataItemLength:]
 		tax := big.NewInt(0).SetBytes(taxBytes).String()
 		raw, err := json.Marshal(ethLog)
 		if err != nil {
@@ -60,7 +61,7 @@ func verifyLog(log types.Log) error {
 	if len(log.Topics) < 4 {
 		return errors.New("log missing topics")
 	}
-	if len(log.Data) < shared.DataItemLength {
+	if len(log.Data) < constants.DataItemLength {
 		return errors.New("log missing data")
 	}
 	return nil