Combine price feed transformers

- fetches logs from all three price feeds in one query
- assumes eth/usd price feed will be updated to include LogValue event
- updates transformers to run separate from header sync

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

@@ -0,0 +1,29 @@
+package price_feeds
+
+import (
+	"github.com/ethereum/go-ethereum/core/types"
+	. "github.com/onsi/gomega"
+)
+
+type MockPriceFeedFetcher struct {
+	passedBlockNumbers []int64
+	returnErr          error
+	returnLogs         []types.Log
+}
+
+func (fetcher *MockPriceFeedFetcher) SetReturnErr(err error) {
+	fetcher.returnErr = err
+}
+
+func (fetcher *MockPriceFeedFetcher) SetReturnLogs(logs []types.Log) {
+	fetcher.returnLogs = logs
+}
+
+func (fetcher *MockPriceFeedFetcher) FetchLogValues(blockNumber int64) ([]types.Log, error) {
+	fetcher.passedBlockNumbers = append(fetcher.passedBlockNumbers, blockNumber)
+	return fetcher.returnLogs, fetcher.returnErr
+}
+
+func (fetcher *MockPriceFeedFetcher) AssertFetchLogValuesCalledWith(blockNumbers []int64) {
+	Expect(fetcher.passedBlockNumbers).To(Equal(blockNumbers))
+}

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

@@ -0,0 +1,49 @@
+package price_feeds
+
+import (
+	. "github.com/onsi/gomega"
+
+	"github.com/vulcanize/vulcanizedb/pkg/core"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/price_feeds"
+)
+
+type MockPriceFeedRepository struct {
+	createErr                 error
+	missingHeaders            []core.Header
+	missingHeadersErr         error
+	passedEndingBlockNumber   int64
+	passedModel               price_feeds.PriceFeedModel
+	passedStartingBlockNumber int64
+}
+
+func (repository *MockPriceFeedRepository) SetCreateErr(err error) {
+	repository.createErr = err
+}
+
+func (repository *MockPriceFeedRepository) SetMissingHeadersErr(err error) {
+	repository.missingHeadersErr = err
+}
+
+func (repository *MockPriceFeedRepository) SetMissingHeaders(headers []core.Header) {
+	repository.missingHeaders = headers
+}
+
+func (repository *MockPriceFeedRepository) Create(model price_feeds.PriceFeedModel) error {
+	repository.passedModel = model
+	return repository.createErr
+}
+
+func (repository *MockPriceFeedRepository) MissingHeaders(startingBlockNumber, endingBlockNumber int64) ([]core.Header, error) {
+	repository.passedStartingBlockNumber = startingBlockNumber
+	repository.passedEndingBlockNumber = endingBlockNumber
+	return repository.missingHeaders, repository.missingHeadersErr
+}
+
+func (repository *MockPriceFeedRepository) AssertCreateCalledWith(model price_feeds.PriceFeedModel) {
+	Expect(repository.passedModel).To(Equal(model))
+}
+
+func (repository *MockPriceFeedRepository) AssertMissingHeadersCalledwith(startingBlockNumber, endingBlockNumber int64) {
+	Expect(repository.passedStartingBlockNumber).To(Equal(startingBlockNumber))
+	Expect(repository.passedEndingBlockNumber).To(Equal(endingBlockNumber))
+}