Get transactions (#45)

* Make transactions requests in parallel

* Update transaction error handling

pkg/history/history_suite_test.go

@@ -4,9 +4,15 @@ import (
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
 
+	"io/ioutil"
+	"log"
 	"testing"
 )
 
+func init() {
+	log.SetOutput(ioutil.Discard)
+}
+
 func TestHistory(t *testing.T) {
 	RegisterFailHandler(Fail)
 	RunSpecs(t, "History Suite")

pkg/history/populate_blocks.go

@@ -18,7 +18,11 @@ func PopulateMissingBlocks(blockchain core.Blockchain, blockRepository datastore
 
 func RetrieveAndUpdateBlocks(blockchain core.Blockchain, blockRepository datastore.BlockRepository, blockNumbers []int64) int {
 	for _, blockNumber := range blockNumbers {
-		block := blockchain.GetBlockByNumber(blockNumber)
+		block, err := blockchain.GetBlockByNumber(blockNumber)
+		if err != nil {
+			log.Printf("failed to retrieve block number: %d\n", blockNumber)
+			return 0
+		}
 		blockRepository.CreateOrUpdateBlock(block)
 	}
 	return len(blockNumbers)

pkg/history/populate_blocks_test.go

@@ -1,6 +1,8 @@
 package history_test
 
 import (
+	"errors"
+
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
 	"github.com/vulcanize/vulcanizedb/pkg/core"
@@ -100,4 +102,12 @@ var _ = Describe("Populating blocks", func() {
 		Expect(blockRepository.CreateOrUpdateBlockCallCount).To(Equal(3))
 	})
 
+	It("does not call repository create block when there is an error", func() {
+		blockchain := fakes.NewBlockchain(errors.New("error getting block"))
+		blocks := history.MakeRange(1, 10)
+		history.RetrieveAndUpdateBlocks(blockchain, blockRepository, blocks)
+		Expect(blockRepository.BlockCount()).To(Equal(0))
+		Expect(blockRepository.CreateOrUpdateBlockCallCount).To(Equal(0))
+	})
+
 })

pkg/history/validate_blocks_test.go

@@ -3,9 +3,6 @@ package history_test
 import (
 	"bytes"
 
-	"io/ioutil"
-	"log"
-
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
 	"github.com/vulcanize/vulcanizedb/pkg/core"
@@ -14,10 +11,6 @@ import (
 	"github.com/vulcanize/vulcanizedb/pkg/history"
 )
 
-func init() {
-	log.SetOutput(ioutil.Discard)
-}
-
 var _ = Describe("Blocks validator", func() {
 
 	It("creates a ValidationWindow equal to (HEAD-windowSize, HEAD)", func() {