Add logging for every transformer

- Also add drip file transformer initializer

pkg/transformers/frob/frob_suite_test.go

@@ -15,6 +15,8 @@
 package frob_test
 
 import (
+	"io/ioutil"
+	"log"
 	"testing"
 
 	. "github.com/onsi/ginkgo"
@@ -25,3 +27,7 @@ func TestFrob(t *testing.T) {
 	RegisterFailHandler(Fail)
 	RunSpecs(t, "Frob Suite")
 }
+
+var _ = BeforeSuite(func() {
+	log.SetOutput(ioutil.Discard)
+})

pkg/transformers/frob/transformer.go

@@ -15,6 +15,8 @@
 package frob
 
 import (
+	"log"
+
 	"github.com/ethereum/go-ethereum/common"
 
 	"github.com/vulcanize/vulcanizedb/pkg/core"
@@ -50,6 +52,7 @@ func (transformer FrobTransformer) Execute() error {
 	if err != nil {
 		return err
 	}
+	log.Printf("Fetching frob event logs for %d headers \n", len(missingHeaders))
 	for _, header := range missingHeaders {
 		topics := [][]common.Hash{{common.HexToHash(shared.FrobSignature)}}
 		matchingLogs, err := transformer.Fetcher.FetchLogs(FrobConfig.ContractAddress, topics, header.BlockNumber)