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/frob/config.go

@@ -14,16 +14,10 @@
 
 package frob
 
-type TransformerConfig struct {
-	ContractAddress     string
-	ContractAbi         string
-	Topics              []string
-	StartingBlockNumber int64
-	EndingBlockNumber   int64
-}
+import "github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
 
-var FrobConfig = TransformerConfig{
-	ContractAddress:     "0xff3f2400f1600f3f493a9a92704a29b96795af1a", //this is a temporary address deployed locally
+var FrobConfig = shared.TransformerConfig{
+	ContractAddresses:   "0xff3f2400f1600f3f493a9a92704a29b96795af1a", //this is a temporary address deployed locally
 	ContractAbi:         FrobABI,
 	Topics:              []string{FrobEventSignature},
 	StartingBlockNumber: 0,

pkg/transformers/frob/transformer.go

@@ -23,13 +23,14 @@ import (
 )
 
 type FrobTransformer struct {
+	Config     shared.TransformerConfig
 	Converter  Converter
 	Fetcher    shared.LogFetcher
 	Repository Repository
 }
 
 type FrobTransformerInitializer struct {
-	Config TransformerConfig
+	Config shared.TransformerConfig
 }
 
 func (initializer FrobTransformerInitializer) NewFrobTransformer(db *postgres.DB, blockChain core.BlockChain) shared.Transformer {
@@ -37,6 +38,7 @@ func (initializer FrobTransformerInitializer) NewFrobTransformer(db *postgres.DB
 	fetcher := shared.NewFetcher(blockChain)
 	repository := NewFrobRepository(db)
 	return FrobTransformer{
+		Config:     initializer.Config,
 		Converter:  converter,
 		Fetcher:    fetcher,
 		Repository: repository,
@@ -44,18 +46,18 @@ func (initializer FrobTransformerInitializer) NewFrobTransformer(db *postgres.DB
 }
 
 func (transformer FrobTransformer) Execute() error {
-	missingHeaders, err := transformer.Repository.MissingHeaders(FrobConfig.StartingBlockNumber, FrobConfig.EndingBlockNumber)
+	missingHeaders, err := transformer.Repository.MissingHeaders(transformer.Config.StartingBlockNumber, transformer.Config.EndingBlockNumber)
 	if err != nil {
 		return err
 	}
 	for _, header := range missingHeaders {
 		topics := [][]common.Hash{{common.HexToHash(FrobEventSignature)}}
-		matchingLogs, err := transformer.Fetcher.FetchLogs(FrobConfig.ContractAddress, topics, header.BlockNumber)
+		matchingLogs, err := transformer.Fetcher.FetchLogs(FrobConfig.ContractAddresses, topics, header.BlockNumber)
 		if err != nil {
 			return err
 		}
 		for _, log := range matchingLogs {
-			entity, err := transformer.Converter.ToEntity(FrobConfig.ContractAddress, FrobConfig.ContractAbi, log)
+			entity, err := transformer.Converter.ToEntity(FrobConfig.ContractAddresses, FrobConfig.ContractAbi, log)
 			if err != nil {
 				return err
 			}

pkg/transformers/frob/transformer_test.go

@@ -32,6 +32,7 @@ var _ = Describe("Frob transformer", func() {
 	It("gets missing headers for block numbers specified in config", func() {
 		repository := &frob_mocks.MockFrobRepository{}
 		transformer := frob.FrobTransformer{
+			Config:     frob.FrobConfig,
 			Fetcher:    &mocks.MockLogFetcher{},
 			Converter:  &frob_mocks.MockFrobConverter{},
 			Repository: repository,
@@ -73,7 +74,7 @@ var _ = Describe("Frob transformer", func() {
 
 		Expect(err).NotTo(HaveOccurred())
 		Expect(fetcher.FetchedBlocks).To(Equal([]int64{1, 2}))
-		Expect(fetcher.FetchedContractAddress).To(Equal(frob.FrobConfig.ContractAddress))
+		Expect(fetcher.FetchedContractAddress).To(Equal(frob.FrobConfig.ContractAddresses))
 		Expect(fetcher.FetchedTopics).To(Equal([][]common.Hash{{common.HexToHash(frob.FrobEventSignature)}}))
 	})
 
@@ -109,7 +110,7 @@ var _ = Describe("Frob transformer", func() {
 		err := transformer.Execute()
 
 		Expect(err).NotTo(HaveOccurred())
-		Expect(converter.PassedContractAddress).To(Equal(frob.FrobConfig.ContractAddress))
+		Expect(converter.PassedContractAddress).To(Equal(frob.FrobConfig.ContractAddresses))
 		Expect(converter.PassedContractABI).To(Equal(frob.FrobConfig.ContractAbi))
 		Expect(converter.PassedLog).To(Equal(test_data.EthFrobLog))
 		Expect(converter.PassedEntity).To(Equal(test_data.FrobEntity))