Fix small issues from review

integration_test/geth_blockchain_test.go

@@ -48,9 +48,13 @@ var _ = Describe("Reading from the Geth blockchain", func() {
 
 	It("reads two blocks", func(done Done) {
 		blocks := fakes.NewMockBlockRepository()
-		lastBlock, _ := blockChain.LastBlock()
+		lastBlock, err := blockChain.LastBlock()
+		Expect(err).NotTo(HaveOccurred())
+
 		queriedBlocks := []int64{lastBlock.Int64() - 5, lastBlock.Int64() - 6}
-		history.RetrieveAndUpdateBlocks(blockChain, blocks, queriedBlocks)
+		_, err = history.RetrieveAndUpdateBlocks(blockChain, blocks, queriedBlocks)
+		Expect(err).NotTo(HaveOccurred())
+
 		blocks.AssertCreateOrUpdateBlocksCallCountAndBlockNumbersEquals(2, []int64{lastBlock.Int64() - 5, lastBlock.Int64() - 6})
 		close(done)
 	}, 30)
@@ -60,8 +64,9 @@ var _ = Describe("Reading from the Geth blockchain", func() {
 		Expect(err).ToNot(HaveOccurred())
 		firstBlock, err := blockChain.GetBlockByNumber(int64(1))
 		Expect(err).ToNot(HaveOccurred())
-		lastBlockNumber, _ := blockChain.LastBlock()
+		lastBlockNumber, err := blockChain.LastBlock()
 
+		Expect(err).NotTo(HaveOccurred())
 		Expect(genesisBlock.Number).To(Equal(int64(0)))
 		Expect(firstBlock.Number).To(Equal(int64(1)))
 		Expect(lastBlockNumber.Int64()).To(BeNumerically(">", 0))

pkg/datastore/postgres/repositories/block_repository.go

@@ -49,11 +49,9 @@ func (blockRepository BlockRepository) SetBlocksStatus(chainHead int64) error {
                   UPDATE blocks SET is_final = TRUE
                   WHERE is_final = FALSE AND number < $1`,
 		cutoff)
-	if err != nil {
+
 	return err
 }
-	return nil
-}
 
 func (blockRepository BlockRepository) CreateOrUpdateBlock(block core.Block) (int64, error) {
 	var err error

pkg/datastore/postgres/repositories/logs_repository.go

@@ -40,13 +40,19 @@ func (logRepository LogRepository) CreateLogs(lgs []core.Log, receiptId int64) e
 			tlog.BlockNumber, tlog.Address, tlog.TxHash, tlog.Index, tlog.Topics[0], tlog.Topics[1], tlog.Topics[2], tlog.Topics[3], tlog.Data, receiptId,
 		)
 		if err != nil {
-			tx.Rollback()
+			err = tx.Rollback()
+			if err != nil {
+				logrus.Error("CreateLogs: could not perform rollback: ", err)
+			}
 			return postgres.ErrDBInsertFailed
 		}
 	}
 	err := tx.Commit()
 	if err != nil {
-		tx.Rollback()
+		err = tx.Rollback()
+		if err != nil {
+			logrus.Error("CreateLogs: could not perform rollback: ", err)
+		}
 		return postgres.ErrDBInsertFailed
 	}
 	return nil
@@ -83,7 +89,8 @@ func (logRepository LogRepository) loadLogs(logsRows *sql.Rows) ([]core.Log, err
 		var topics core.Topics
 		err := logsRows.Scan(&blockNumber, &address, &txHash, &index, &topics[0], &topics[1], &topics[2], &topics[3], &data)
 		if err != nil {
-			logrus.Warn("loadLogs: Error scanning a row in logRows")
+			logrus.Error("loadLogs: Error scanning a row in logRows: ", err)
+			return []core.Log{}, err
 		}
 		lg := core.Log{
 			BlockNumber: blockNumber,

pkg/datastore/postgres/repositories/logs_repository_test.go

@@ -56,7 +56,7 @@ var _ = Describe("Logs Repository", func() {
 			Expect(err).NotTo(HaveOccurred())
 			receiptId, err := receiptRepository.CreateReceipt(blockId, core.Receipt{})
 			Expect(err).NotTo(HaveOccurred())
-			logsRepository.CreateLogs([]core.Log{{
+			err = logsRepository.CreateLogs([]core.Log{{
 				BlockNumber: blockNumber,
 				Index:       0,
 				Address:     "x123",
@@ -64,6 +64,7 @@ var _ = Describe("Logs Repository", func() {
 				Topics:      core.Topics{0: "x777", 1: "x888", 2: "x999"},
 				Data:        "xabc",
 			}}, receiptId)
+			Expect(err).NotTo(HaveOccurred())
 
 			log, err := logsRepository.GetLogs("x123", blockNumber)
 
@@ -91,7 +92,8 @@ var _ = Describe("Logs Repository", func() {
 			Expect(err).NotTo(HaveOccurred())
 			receiptId, err := receiptRepository.CreateReceipt(blockId, core.Receipt{})
 			Expect(err).NotTo(HaveOccurred())
-			_ = logsRepository.CreateLogs([]core.Log{{
+
+			err = logsRepository.CreateLogs([]core.Log{{
 				BlockNumber: blockNumber,
 				Index:       0,
 				Address:     "x123",
@@ -99,7 +101,9 @@ var _ = Describe("Logs Repository", func() {
 				Topics:      core.Topics{0: "x777", 1: "x888", 2: "x999"},
 				Data:        "xabc",
 			}}, receiptId)
-			_ = logsRepository.CreateLogs([]core.Log{{
+			Expect(err).NotTo(HaveOccurred())
+
+			err = logsRepository.CreateLogs([]core.Log{{
 				BlockNumber: blockNumber,
 				Index:       1,
 				Address:     "x123",
@@ -107,7 +111,9 @@ var _ = Describe("Logs Repository", func() {
 				Topics:      core.Topics{0: "x111", 1: "x222", 2: "x333"},
 				Data:        "xdef",
 			}}, receiptId)
-			_ = logsRepository.CreateLogs([]core.Log{{
+			Expect(err).NotTo(HaveOccurred())
+
+			err = logsRepository.CreateLogs([]core.Log{{
 				BlockNumber: 2,
 				Index:       0,
 				Address:     "x123",
@@ -115,6 +121,7 @@ var _ = Describe("Logs Repository", func() {
 				Topics:      core.Topics{0: "x777", 1: "x888", 2: "x999"},
 				Data:        "xabc",
 			}}, receiptId)
+			Expect(err).NotTo(HaveOccurred())
 
 			log, err := logsRepository.GetLogs("x123", blockNumber)
 			Expect(err).NotTo(HaveOccurred())

pkg/geth/blockchain_test.go

@@ -221,7 +221,8 @@ var _ = Describe("Geth blockchain", func() {
 			blockNumber := int64(100)
 			mockClient.SetHeaderByNumberReturnHeader(&types.Header{Number: big.NewInt(blockNumber)})
 
-			result, _ := blockChain.LastBlock()
+			result, err := blockChain.LastBlock()
+			Expect(err).NotTo(HaveOccurred())
 
 			mockClient.AssertHeaderByNumberCalledWith(context.Background(), nil)
 			Expect(result).To(Equal(big.NewInt(blockNumber)))