Add logging for every transformer

- Also add drip file transformer initializer

pkg/transformers/price_feeds/price_feeds_suite_test.go

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

pkg/transformers/price_feeds/transformer.go

@@ -15,6 +15,8 @@
 package price_feeds
 
 import (
+	"log"
+
 	"github.com/vulcanize/vulcanizedb/pkg/core"
 	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
@@ -48,6 +50,7 @@ func (transformer PriceFeedTransformer) Execute() error {
 	if err != nil {
 		return err
 	}
+	log.Printf("Fetching price feed event logs for %d headers \n", len(headers))
 	for _, header := range headers {
 		logs, err := transformer.Fetcher.FetchLogValues(header.BlockNumber)
 		if err != nil {