Make price feed log persistence atomic per block

- Prevents marking header as checked if only one of several price feed
  logs is successfully persisted

pkg/transformers/price_feeds/converter.go

@@ -21,18 +21,25 @@ import (
 )
 
 type Converter interface {
-	ToModel(log types.Log, headerID int64) (PriceFeedModel, error)
+	ToModels(logs []types.Log, headerID int64) ([]PriceFeedModel, error)
 }
 
 type PriceFeedConverter struct{}
 
-func (converter PriceFeedConverter) ToModel(log types.Log, headerID int64) (PriceFeedModel, error) {
+func (converter PriceFeedConverter) ToModels(logs []types.Log, headerID int64) (results []PriceFeedModel, err error) {
+	for _, log := range logs {
 		raw, err := json.Marshal(log)
-	return PriceFeedModel{
+		if err != nil {
+			return nil, err
+		}
+		model := PriceFeedModel{
 			BlockNumber:       log.BlockNumber,
 			MedianizerAddress: log.Address.Bytes(),
 			UsdValue:          Convert("wad", hexutil.Encode(log.Data), 15),
 			TransactionIndex:  log.TxIndex,
 			Raw:               raw,
-	}, err
+		}
+		results = append(results, model)
+	}
+	return results, err
 }

pkg/transformers/price_feeds/converter_test.go

@@ -18,6 +18,7 @@ import (
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
 
+	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/price_feeds"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/test_data"
 )
@@ -27,9 +28,10 @@ var _ = Describe("Price feed Converter", func() {
 		converter := price_feeds.PriceFeedConverter{}
 		headerID := int64(123)
 
-		model, err := converter.ToModel(test_data.EthPriceFeedLog, headerID)
+		models, err := converter.ToModels([]types.Log{test_data.EthPriceFeedLog}, headerID)
 
 		Expect(err).NotTo(HaveOccurred())
-		Expect(model).To(Equal(test_data.PriceFeedModel))
+		Expect(len(models)).To(Equal(1))
+		Expect(models[0]).To(Equal(test_data.PriceFeedModel))
 	})
 })

pkg/transformers/price_feeds/repository.go

@@ -20,7 +20,7 @@ import (
 )
 
 type IPriceFeedRepository interface {
-	Create(headerID int64, model PriceFeedModel) error
+	Create(headerID int64, models []PriceFeedModel) error
 	MarkHeaderChecked(headerID int64) error
 	MissingHeaders(startingBlockNumber, endingBlockNumber int64) ([]core.Header, error)
 }
@@ -33,14 +33,19 @@ func NewPriceFeedRepository(db *postgres.DB) PriceFeedRepository {
 	return PriceFeedRepository{db: db}
 }
 
-func (repository PriceFeedRepository) Create(headerID int64, model PriceFeedModel) error {
+func (repository PriceFeedRepository) Create(headerID int64, models []PriceFeedModel) error {
 	tx, err := repository.db.Begin()
+	if err != nil {
+		return err
+	}
+	for _, model := range models {
 		_, err = tx.Exec(`INSERT INTO maker.price_feeds (block_number, header_id, medianizer_address, usd_value, tx_idx, raw_log)
 		VALUES ($1, $2, $3, $4::NUMERIC, $5, $6)`, model.BlockNumber, headerID, model.MedianizerAddress, model.UsdValue, model.TransactionIndex, model.Raw)
 		if err != nil {
 			tx.Rollback()
 			return err
 		}
+	}
 	_, err = tx.Exec(`INSERT INTO public.checked_headers (header_id, price_feeds_checked)
 		VALUES ($1, $2) 
 	ON CONFLICT (header_id) DO
@@ -49,8 +54,7 @@ func (repository PriceFeedRepository) Create(headerID int64, model PriceFeedMode
 		tx.Rollback()
 		return err
 	}
-	tx.Commit()
+	return tx.Commit()
-	return nil
 }
 
 func (repository PriceFeedRepository) MarkHeaderChecked(headerID int64) error {

pkg/transformers/price_feeds/repository_test.go

@@ -35,7 +35,7 @@ var _ = Describe("Price feeds repository", func() {
 			Expect(err).NotTo(HaveOccurred())
 			priceFeedRepository := price_feeds.NewPriceFeedRepository(db)
 
-			err = priceFeedRepository.Create(headerID, test_data.PriceFeedModel)
+			err = priceFeedRepository.Create(headerID, []price_feeds.PriceFeedModel{test_data.PriceFeedModel})
 
 			Expect(err).NotTo(HaveOccurred())
 			var dbPriceFeedUpdate price_feeds.PriceFeedModel
@@ -56,7 +56,7 @@ var _ = Describe("Price feeds repository", func() {
 			Expect(err).NotTo(HaveOccurred())
 			priceFeedRepository := price_feeds.NewPriceFeedRepository(db)
 
-			err = priceFeedRepository.Create(headerID, test_data.PriceFeedModel)
+			err = priceFeedRepository.Create(headerID, []price_feeds.PriceFeedModel{test_data.PriceFeedModel})
 
 			Expect(err).NotTo(HaveOccurred())
 			var headerChecked bool
@@ -73,10 +73,10 @@ var _ = Describe("Price feeds repository", func() {
 			headerID, err := headerRepository.CreateOrUpdateHeader(header)
 			Expect(err).NotTo(HaveOccurred())
 			priceFeedRepository := price_feeds.NewPriceFeedRepository(db)
-			err = priceFeedRepository.Create(headerID, test_data.PriceFeedModel)
+			err = priceFeedRepository.Create(headerID, []price_feeds.PriceFeedModel{test_data.PriceFeedModel})
 			Expect(err).NotTo(HaveOccurred())
 
-			err = priceFeedRepository.Create(headerID, test_data.PriceFeedModel)
+			err = priceFeedRepository.Create(headerID, []price_feeds.PriceFeedModel{test_data.PriceFeedModel})
 
 			Expect(err).To(HaveOccurred())
 		})

pkg/transformers/price_feeds/transformer.go

@@ -62,16 +62,14 @@ func (transformer PriceFeedTransformer) Execute() error {
 				return err
 			}
 		}
-		for _, log := range logs {
+		models, err := transformer.Converter.ToModels(logs, header.Id)
-			model, err := transformer.Converter.ToModel(log, header.Id)
 		if err != nil {
 			return err
 		}
-			err = transformer.Repository.Create(header.Id, model)
+		err = transformer.Repository.Create(header.Id, models)
 		if err != nil {
 			return err
 		}
 	}
-	}
 	return nil
 }

pkg/transformers/price_feeds/transformer_test.go

@@ -149,7 +149,7 @@ var _ = Describe("Price feed transformer", func() {
 
 		Expect(err).NotTo(HaveOccurred())
 		Expect(mockConverter.PassedHeaderID).To(Equal(headerID))
-		Expect(mockConverter.PassedLog).To(Equal(test_data.EthPriceFeedLog))
+		Expect(mockConverter.PassedLogs).To(Equal([]types.Log{test_data.EthPriceFeedLog}))
 	})
 
 	It("returns err if converter returns err", func() {
@@ -188,7 +188,7 @@ var _ = Describe("Price feed transformer", func() {
 		err := transformer.Execute()
 
 		Expect(err).NotTo(HaveOccurred())
-		mockRepository.AssertCreateCalledWith(headerID, test_data.PriceFeedModel)
+		mockRepository.AssertCreateCalledWith(headerID, []price_feeds.PriceFeedModel{test_data.PriceFeedModel})
 	})
 
 	It("returns error if creating price feed update returns error", func() {

pkg/transformers/test_data/mocks/price_feeds/converter.go

@@ -22,14 +22,14 @@ import (
 
 type MockPriceFeedConverter struct {
 	converterErr   error
-	PassedLog      types.Log
+	PassedLogs     []types.Log
 	PassedHeaderID int64
 }
 
-func (converter *MockPriceFeedConverter) ToModel(log types.Log, headerID int64) (price_feeds.PriceFeedModel, error) {
+func (converter *MockPriceFeedConverter) ToModels(logs []types.Log, headerID int64) ([]price_feeds.PriceFeedModel, error) {
-	converter.PassedLog = log
+	converter.PassedLogs = logs
 	converter.PassedHeaderID = headerID
-	return test_data.PriceFeedModel, converter.converterErr
+	return []price_feeds.PriceFeedModel{test_data.PriceFeedModel}, converter.converterErr
 }
 
 func (converter *MockPriceFeedConverter) SetConverterErr(e error) {

pkg/transformers/test_data/mocks/price_feeds/repository.go

@@ -29,7 +29,7 @@ type MockPriceFeedRepository struct {
 	missingHeaders                  []core.Header
 	missingHeadersErr               error
 	passedEndingBlockNumber         int64
-	passedModel                     price_feeds.PriceFeedModel
+	passedModels                    []price_feeds.PriceFeedModel
 	passedStartingBlockNumber       int64
 }
 
@@ -49,9 +49,9 @@ func (repository *MockPriceFeedRepository) SetMissingHeaders(headers []core.Head
 	repository.missingHeaders = headers
 }
 
-func (repository *MockPriceFeedRepository) Create(headerID int64, model price_feeds.PriceFeedModel) error {
+func (repository *MockPriceFeedRepository) Create(headerID int64, models []price_feeds.PriceFeedModel) error {
 	repository.createPassedHeaderID = headerID
-	repository.passedModel = model
+	repository.passedModels = models
 	return repository.createErr
 }
 
@@ -66,9 +66,9 @@ func (repository *MockPriceFeedRepository) MissingHeaders(startingBlockNumber, e
 	return repository.missingHeaders, repository.missingHeadersErr
 }
 
-func (repository *MockPriceFeedRepository) AssertCreateCalledWith(headerID int64, model price_feeds.PriceFeedModel) {
+func (repository *MockPriceFeedRepository) AssertCreateCalledWith(headerID int64, models []price_feeds.PriceFeedModel) {
 	Expect(repository.createPassedHeaderID).To(Equal(headerID))
-	Expect(repository.passedModel).To(Equal(model))
+	Expect(repository.passedModels).To(Equal(models))
 }
 
 func (repository *MockPriceFeedRepository) AssertMarkHeaderCheckedCalledWith(headerID int64) {