Merge pull request #73 from 8thlight/transformer-refactoring

Transformer factory evaluation

cmd/continuousLogSync.go

@@ -86,33 +86,33 @@ func getTransformerInititalizers(transformerNames []string) []shared2.Transforme
 func buildTransformerInitializerMap() map[string]shared2.TransformerInitializer {
 	transformerInitializerMap := make(map[string]shared2.TransformerInitializer)
 
-	transformerInitializerMap["bite"] = transformers.BiteTransformerInitializer
-	transformerInitializerMap["catFileChopLump"] = transformers.CatFileChopLumpTransformerInitializer
-	transformerInitializerMap["catFileFlip"] = transformers.CatFileFlipTransformerInitializer
-	transformerInitializerMap["catFilePitVow"] = transformers.CatFilePitVowTransformerInitializer
-	transformerInitializerMap["deal"] = transformers.DealTransformerInitializer
-	transformerInitializerMap["dent"] = transformers.DentTransformerInitializer
-	transformerInitializerMap["dripDrip"] = transformers.DripDripTransformerInitializer
-	transformerInitializerMap["dripFileIlk"] = transformers.DripFileIlkTransformerInitializer
-	transformerInitializerMap["dripFileRepo"] = transformers.DripFileRepoTransformerInitializer
-	transformerInitializerMap["dripFileVow"] = transformers.DripFileVowTransfromerInitializer
-	transformerInitializerMap["flipKick"] = transformers.FlipKickTransformerInitializer
-	transformerInitializerMap["flopKick"] = transformers.FlopKickTransformerInitializer
-	transformerInitializerMap["frob"] = transformers.FrobTransformerInitializer
-	transformerInitializerMap["pitFileDebtCeiling"] = transformers.PitFileDebtCeilingTransformerInitializer
-	transformerInitializerMap["pitFileIlk"] = transformers.PitFileIlkTransformerInitializer
-	transformerInitializerMap["pitFileStabilityFee"] = transformers.PitFileStabilityFeeTransformerInitializer
-	transformerInitializerMap["priceFeed"] = transformers.PriceFeedTransformerInitializer
-	transformerInitializerMap["tend"] = transformers.TendTransformerInitializer
-	transformerInitializerMap["vatGrab"] = transformers.VatGrabTransformerInitializer
-	transformerInitializerMap["vatInit"] = transformers.VatInitTransformerInitializer
-	transformerInitializerMap["vatMove"] = transformers.VatMoveTransformerInitializer
-	transformerInitializerMap["vatHeal"] = transformers.VatHealTransformerInitializer
-	transformerInitializerMap["vatFold"] = transformers.VatFoldTransformerInitializer
-	transformerInitializerMap["vatSlip"] = transformers.VatSlipTransformerInitializer
-	transformerInitializerMap["vatToll"] = transformers.VatTollTransformerInitializer
-	transformerInitializerMap["vatTune"] = transformers.VatTuneTransformerInitializer
-	transformerInitializerMap["vatFlux"] = transformers.VatFluxTransformerInitializer
+	transformerInitializerMap[shared2.BiteLabel] = transformers.BiteTransformerInitializer
+	transformerInitializerMap[shared2.CatFileChopLumpLabel] = transformers.CatFileChopLumpTransformerInitializer
+	transformerInitializerMap[shared2.CatFileFlipLabel] = transformers.CatFileFlipTransformerInitializer
+	transformerInitializerMap[shared2.CatFilePitVowLabel] = transformers.CatFilePitVowTransformerInitializer
+	transformerInitializerMap[shared2.DealLabel] = transformers.DealTransformerInitializer
+	transformerInitializerMap[shared2.DentLabel] = transformers.DentTransformerInitializer
+	transformerInitializerMap[shared2.DripDripLabel] = transformers.DripDripTransformerInitializer
+	transformerInitializerMap[shared2.DripFileIlkLabel] = transformers.DripFileIlkTransformerInitializer
+	transformerInitializerMap[shared2.DripFileRepoLabel] = transformers.DripFileRepoTransformerInitializer
+	transformerInitializerMap[shared2.DripFileVowLabel] = transformers.DripFileVowTransfromerInitializer
+	transformerInitializerMap[shared2.FlipKickLabel] = transformers.FlipKickTransformerInitializer
+	transformerInitializerMap[shared2.FlopKickLabel] = transformers.FlopKickTransformerInitializer
+	transformerInitializerMap[shared2.FrobLabel] = transformers.FrobTransformerInitializer
+	transformerInitializerMap[shared2.PitFileDebtCeilingLabel] = transformers.PitFileDebtCeilingTransformerInitializer
+	transformerInitializerMap[shared2.PitFileIlkLabel] = transformers.PitFileIlkTransformerInitializer
+	transformerInitializerMap[shared2.PitFileStabilityFeeLabel] = transformers.PitFileStabilityFeeTransformerInitializer
+	transformerInitializerMap[shared2.PriceFeedLabel] = transformers.PriceFeedTransformerInitializer
+	transformerInitializerMap[shared2.TendLabel] = transformers.TendTransformerInitializer
+	transformerInitializerMap[shared2.VatGrabLabel] = transformers.VatGrabTransformerInitializer
+	transformerInitializerMap[shared2.VatInitLabel] = transformers.VatInitTransformerInitializer
+	transformerInitializerMap[shared2.VatMoveLabel] = transformers.VatMoveTransformerInitializer
+	transformerInitializerMap[shared2.VatHealLabel] = transformers.VatHealTransformerInitializer
+	transformerInitializerMap[shared2.VatFoldLabel] = transformers.VatFoldTransformerInitializer
+	transformerInitializerMap[shared2.VatSlipLabel] = transformers.VatSlipTransformerInitializer
+	transformerInitializerMap[shared2.VatTollLabel] = transformers.VatTollTransformerInitializer
+	transformerInitializerMap[shared2.VatTuneLabel] = transformers.VatTuneTransformerInitializer
+	transformerInitializerMap[shared2.VatFluxLabel] = transformers.VatFluxTransformerInitializer
 
 	return transformerInitializerMap
 }

db/schema.sql

@@ -2,8 +2,8 @@
 -- PostgreSQL database dump
 --
 
--- Dumped from database version 10.3
--- Dumped by pg_dump version 10.3
+-- Dumped from database version 10.5
+-- Dumped by pg_dump version 10.5
 
 SET statement_timeout = 0;
 SET lock_timeout = 0;

pkg/transformers/drip_file/ilk/config.go

@@ -12,14 +12,15 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package drip_file
+package ilk
 
 import "github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
 
-var DripFileConfig = shared.TransformerConfig{
+var DripFileIlkConfig = shared.SingleTransformerConfig{
+	TransformerName:     shared.DripFileIlkLabel,
 	ContractAddresses:   []string{shared.DripContractAddress},
 	ContractAbi:         shared.DripABI,
-	Topics:              []string{shared.DripFileIlkSignature, shared.DripFileRepoSignature},
+	Topic:               shared.DripFileIlkSignature,
 	StartingBlockNumber: 0,
 	EndingBlockNumber:   10000000,
 }

pkg/transformers/drip_file/ilk/converter.go

@@ -24,19 +24,16 @@ import (
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
 )
 
-type Converter interface {
-	ToModels(ethLogs []types.Log) ([]DripFileIlkModel, error)
-}
-
 type DripFileIlkConverter struct{}
 
-func (DripFileIlkConverter) ToModels(ethLogs []types.Log) ([]DripFileIlkModel, error) {
-	var models []DripFileIlkModel
+func (DripFileIlkConverter) ToModels(ethLogs []types.Log) ([]interface{}, error) {
+	var models []interface{}
 	for _, ethLog := range ethLogs {
 		err := verifyLog(ethLog)
 		if err != nil {
 			return nil, err
 		}
+
 		ilk := string(bytes.Trim(ethLog.Topics[2].Bytes(), "\x00"))
 		vow := string(bytes.Trim(ethLog.Topics[3].Bytes(), "\x00"))
 		taxBytes := ethLog.Data[len(ethLog.Data)-shared.DataItemLength:]
@@ -45,6 +42,7 @@ func (DripFileIlkConverter) ToModels(ethLogs []types.Log) ([]DripFileIlkModel, e
 		if err != nil {
 			return nil, err
 		}
+
 		model := DripFileIlkModel{
 			Ilk:              ilk,
 			Vow:              vow,

pkg/transformers/drip_file/ilk/converter_test.go

@@ -56,6 +56,6 @@ var _ = Describe("Drip file ilk converter", func() {
 
 		Expect(err).NotTo(HaveOccurred())
 		Expect(len(models)).To(Equal(1))
-		Expect(models[0]).To(Equal(test_data.DripFileIlkModel))
+		Expect(models[0].(ilk.DripFileIlkModel)).To(Equal(test_data.DripFileIlkModel))
 	})
 })

pkg/transformers/drip_file/ilk/repository.go

@@ -15,35 +15,34 @@
 package ilk
 
 import (
+	"fmt"
 	"github.com/vulcanize/vulcanizedb/pkg/core"
 	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
 )
 
-type Repository interface {
-	Create(headerID int64, models []DripFileIlkModel) error
-	MarkHeaderChecked(headerID int64) error
-	MissingHeaders(startingBlockNumber, endingBlockNumber int64) ([]core.Header, error)
-}
-
 type DripFileIlkRepository struct {
 	db *postgres.DB
 }
 
-func NewDripFileIlkRepository(db *postgres.DB) DripFileIlkRepository {
-	return DripFileIlkRepository{db: db}
-}
-
-func (repository DripFileIlkRepository) Create(headerID int64, models []DripFileIlkModel) error {
+func (repository DripFileIlkRepository) Create(headerID int64, models []interface{}) error {
 	tx, err := repository.db.Begin()
 	if err != nil {
 		return err
 	}
+
 	for _, model := range models {
+		ilk, ok := model.(DripFileIlkModel)
+		if !ok {
+			tx.Rollback()
+			return fmt.Errorf("model of type %T, not %T", model, DripFileIlkModel{})
+		}
+
 		_, err = tx.Exec(
 			`INSERT into maker.drip_file_ilk (header_id, ilk, vow, tax, log_idx, tx_idx, raw_log)
-        VALUES($1, $2, $3, $4::NUMERIC, $5, $6, $7)`,
-			headerID, model.Ilk, model.Vow, model.Tax, model.LogIndex, model.TransactionIndex, model.Raw,
+        	VALUES($1, $2, $3, $4::NUMERIC, $5, $6, $7)`,
+			headerID, ilk.Ilk, ilk.Vow, ilk.Tax, ilk.LogIndex, ilk.TransactionIndex, ilk.Raw,
 		)
+
 		if err != nil {
 			tx.Rollback()
 			return err
@@ -51,20 +50,21 @@ func (repository DripFileIlkRepository) Create(headerID int64, models []DripFile
 	}
 	_, err = tx.Exec(`INSERT INTO public.checked_headers (header_id, drip_file_ilk_checked)
 		VALUES ($1, $2) 
-	ON CONFLICT (header_id) DO
-		UPDATE SET drip_file_ilk_checked = $2`, headerID, true)
+		ON CONFLICT (header_id) DO
+			UPDATE SET drip_file_ilk_checked = $2`, headerID, true)
 	if err != nil {
 		tx.Rollback()
 		return err
 	}
+
 	return tx.Commit()
 }
 
 func (repository DripFileIlkRepository) MarkHeaderChecked(headerID int64) error {
 	_, err := repository.db.Exec(`INSERT INTO public.checked_headers (header_id, drip_file_ilk_checked)
 		VALUES ($1, $2) 
-	ON CONFLICT (header_id) DO
-		UPDATE SET drip_file_ilk_checked = $2`, headerID, true)
+		ON CONFLICT (header_id) DO
+			UPDATE SET drip_file_ilk_checked = $2`, headerID, true)
 	return err
 }
 
@@ -73,14 +73,18 @@ func (repository DripFileIlkRepository) MissingHeaders(startingBlockNumber, endi
 	err := repository.db.Select(
 		&result,
 		`SELECT headers.id, headers.block_number FROM headers
-               LEFT JOIN checked_headers on headers.id = header_id
-               WHERE (header_id ISNULL OR drip_file_ilk_checked IS FALSE)
-               AND headers.block_number >= $1
-               AND headers.block_number <= $2
-               AND headers.eth_node_fingerprint = $3`,
+			LEFT JOIN checked_headers on headers.id = header_id
+		WHERE (header_id ISNULL OR drip_file_ilk_checked IS FALSE)
+			AND headers.block_number >= $1
+			AND headers.block_number <= $2
+			AND headers.eth_node_fingerprint = $3`,
 		startingBlockNumber,
 		endingBlockNumber,
 		repository.db.Node.ID,
 	)
 	return result, err
 }
+
+func (repository *DripFileIlkRepository) SetDB(db *postgres.DB) {
+	repository.db = db
+}

pkg/transformers/drip_file/ilk/repository_test.go

@@ -16,10 +16,8 @@ package ilk_test
 
 import (
 	"database/sql"
-
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
-
 	"github.com/vulcanize/vulcanizedb/pkg/core"
 	"github.com/vulcanize/vulcanizedb/pkg/datastore"
 	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
@@ -33,7 +31,7 @@ import (
 var _ = Describe("Drip file ilk repository", func() {
 	var (
 		db                    *postgres.DB
-		dripFileIlkRepository ilk.Repository
+		dripFileIlkRepository ilk.DripFileIlkRepository
 		err                   error
 		headerRepository      datastore.HeaderRepository
 	)
@@ -42,7 +40,8 @@ var _ = Describe("Drip file ilk repository", func() {
 		db = test_config.NewTestDB(test_config.NewTestNode())
 		test_config.CleanTestDB(db)
 		headerRepository = repositories.NewHeaderRepository(db)
-		dripFileIlkRepository = ilk.NewDripFileIlkRepository(db)
+		dripFileIlkRepository = ilk.DripFileIlkRepository{}
+		dripFileIlkRepository.SetDB(db)
 	})
 
 	Describe("Create", func() {
@@ -52,7 +51,7 @@ var _ = Describe("Drip file ilk repository", func() {
 			headerID, err = headerRepository.CreateOrUpdateHeader(fakes.FakeHeader)
 			Expect(err).NotTo(HaveOccurred())
 
-			err = dripFileIlkRepository.Create(headerID, []ilk.DripFileIlkModel{test_data.DripFileIlkModel})
+			err = dripFileIlkRepository.Create(headerID, []interface{}{test_data.DripFileIlkModel})
 			Expect(err).NotTo(HaveOccurred())
 		})
 
@@ -69,7 +68,6 @@ var _ = Describe("Drip file ilk repository", func() {
 		})
 
 		It("marks header as checked for logs", func() {
-			Expect(err).NotTo(HaveOccurred())
 			var headerChecked bool
 			err = db.Get(&headerChecked, `SELECT drip_file_ilk_checked FROM public.checked_headers WHERE header_id = $1`, headerID)
 			Expect(err).NotTo(HaveOccurred())
@@ -77,7 +75,7 @@ var _ = Describe("Drip file ilk repository", func() {
 		})
 
 		It("does not duplicate drip file events", func() {
-			err = dripFileIlkRepository.Create(headerID, []ilk.DripFileIlkModel{test_data.DripFileIlkModel})
+			err = dripFileIlkRepository.Create(headerID, []interface{}{test_data.DripFileIlkModel})
 
 			Expect(err).To(HaveOccurred())
 			Expect(err.Error()).To(ContainSubstring("pq: duplicate key value violates unique constraint"))
@@ -92,6 +90,12 @@ var _ = Describe("Drip file ilk repository", func() {
 			Expect(err).To(HaveOccurred())
 			Expect(err).To(MatchError(sql.ErrNoRows))
 		})
+
+		It("Returns an error if model is of wrong type", func() {
+			err = dripFileIlkRepository.Create(headerID, []interface{}{test_data.WrongModel{}})
+			Expect(err).To(HaveOccurred())
+			Expect(err.Error()).To(ContainSubstring("model of type"))
+		})
 	})
 
 	Describe("MarkHeaderChecked", func() {
@@ -139,12 +143,12 @@ var _ = Describe("Drip file ilk repository", func() {
 			blockNumbers = []int64{startingBlock, dripFileBlock, endingBlock, endingBlock + 1}
 
 			headerIDs = []int64{}
+
 			for _, n := range blockNumbers {
 				headerID, err := headerRepository.CreateOrUpdateHeader(fakes.GetFakeHeader(n))
 				Expect(err).NotTo(HaveOccurred())
 				headerIDs = append(headerIDs, headerID)
 			}
-
 		})
 
 		It("returns headers with no associated drip file event", func() {
@@ -179,7 +183,8 @@ var _ = Describe("Drip file ilk repository", func() {
 				_, err = headerRepositoryTwo.CreateOrUpdateHeader(fakes.GetFakeHeader(n))
 				Expect(err).NotTo(HaveOccurred())
 			}
-			dripFileIlkRepositoryTwo := ilk.NewDripFileIlkRepository(dbTwo)
+			dripFileIlkRepositoryTwo := ilk.DripFileIlkRepository{}
+			dripFileIlkRepositoryTwo.SetDB(dbTwo)
 			err := dripFileIlkRepository.MarkHeaderChecked(headerIDs[0])
 			Expect(err).NotTo(HaveOccurred())
 

pkg/transformers/drip_file/ilk/transformer.go

@@ -1,79 +0,0 @@
-// Copyright 2018 Vulcanize
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package ilk
-
-import (
-	"log"
-
-	"github.com/ethereum/go-ethereum/common"
-
-	"github.com/vulcanize/vulcanizedb/pkg/core"
-	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/drip_file"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
-)
-
-type DripFileIlkTransformer struct {
-	Config     shared.TransformerConfig
-	Converter  Converter
-	Fetcher    shared.LogFetcher
-	Repository Repository
-}
-
-type DripFileIlkTransformerInitializer struct {
-	Config shared.TransformerConfig
-}
-
-func (initializer DripFileIlkTransformerInitializer) NewDripFileIlkTransformer(db *postgres.DB, blockChain core.BlockChain) shared.Transformer {
-	converter := DripFileIlkConverter{}
-	fetcher := shared.NewFetcher(blockChain)
-	repository := NewDripFileIlkRepository(db)
-	return DripFileIlkTransformer{
-		Config:     initializer.Config,
-		Converter:  converter,
-		Fetcher:    fetcher,
-		Repository: repository,
-	}
-}
-
-func (transformer DripFileIlkTransformer) Execute() error {
-	missingHeaders, err := transformer.Repository.MissingHeaders(transformer.Config.StartingBlockNumber, transformer.Config.EndingBlockNumber)
-	if err != nil {
-		return err
-	}
-	log.Printf("Fetching drip file ilk event logs for %d headers \n", len(missingHeaders))
-	for _, header := range missingHeaders {
-		topics := [][]common.Hash{{common.HexToHash(shared.DripFileIlkSignature)}}
-		matchingLogs, err := transformer.Fetcher.FetchLogs(drip_file.DripFileConfig.ContractAddresses, topics, header.BlockNumber)
-		if err != nil {
-			return err
-		}
-		if len(matchingLogs) < 1 {
-			err = transformer.Repository.MarkHeaderChecked(header.Id)
-			if err != nil {
-				return err
-			}
-		}
-		model, err := transformer.Converter.ToModels(matchingLogs)
-		if err != nil {
-			return err
-		}
-		err = transformer.Repository.Create(header.Id, model)
-		if err != nil {
-			return err
-		}
-	}
-	return nil
-}

pkg/transformers/drip_file/ilk/transformer_test.go

@@ -19,10 +19,11 @@ import (
 	"github.com/ethereum/go-ethereum/core/types"
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/factories"
+	"math/rand"
 
 	"github.com/vulcanize/vulcanizedb/pkg/core"
 	"github.com/vulcanize/vulcanizedb/pkg/fakes"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/drip_file"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/drip_file/ilk"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/test_data"
@@ -31,31 +32,45 @@ import (
 )
 
 var _ = Describe("Drip file ilk transformer", func() {
-	It("gets missing headers for block numbers specified in config", func() {
-		repository := &ilk_mocks.MockDripFileIlkRepository{}
-		transformer := ilk.DripFileIlkTransformer{
-			Config:     drip_file.DripFileConfig,
-			Fetcher:    &mocks.MockLogFetcher{},
-			Converter:  &ilk_mocks.MockDripFileIlkConverter{},
-			Repository: repository,
-		}
+	var (
+		config      = ilk.DripFileIlkConfig
+		fetcher     mocks.MockLogFetcher
+		converter   ilk_mocks.MockDripFileIlkConverter
+		repository  ilk_mocks.MockDripFileIlkRepository
+		transformer shared.Transformer
+		headerOne   core.Header
+		headerTwo   core.Header
+	)
 
+	BeforeEach(func() {
+		fetcher = mocks.MockLogFetcher{}
+		converter = ilk_mocks.MockDripFileIlkConverter{}
+		repository = ilk_mocks.MockDripFileIlkRepository{}
+		transformer = factories.Transformer{
+			Config:     config,
+			Fetcher:    &fetcher,
+			Converter:  &converter,
+			Repository: &repository,
+		}.NewTransformer(nil, nil)
+		headerOne = core.Header{BlockNumber: rand.Int63(), Id: rand.Int63()}
+		headerTwo = core.Header{BlockNumber: rand.Int63(), Id: rand.Int63()}
+	})
+
+	It("sets the blockchain and database", func() {
+		Expect(fetcher.SetBcCalled).To(BeTrue())
+		Expect(repository.SetDbCalled).To(BeTrue())
+	})
+
+	It("gets missing headers for block numbers specified in config", func() {
 		err := transformer.Execute()
 
 		Expect(err).NotTo(HaveOccurred())
-		Expect(repository.PassedStartingBlockNumber).To(Equal(drip_file.DripFileConfig.StartingBlockNumber))
-		Expect(repository.PassedEndingBlockNumber).To(Equal(drip_file.DripFileConfig.EndingBlockNumber))
+		Expect(repository.PassedStartingBlockNumber).To(Equal(config.StartingBlockNumber))
+		Expect(repository.PassedEndingBlockNumber).To(Equal(config.EndingBlockNumber))
 	})
 
 	It("returns error if repository returns error for missing headers", func() {
-		repository := &ilk_mocks.MockDripFileIlkRepository{}
-		repository.SetMissingHeadersErr(fakes.FakeError)
-		transformer := ilk.DripFileIlkTransformer{
-			Fetcher:    &mocks.MockLogFetcher{},
-			Converter:  &ilk_mocks.MockDripFileIlkConverter{},
-			Repository: repository,
-		}
-
+		repository.SetMissingHeadersError(fakes.FakeError)
 		err := transformer.Execute()
 
 		Expect(err).To(HaveOccurred())
@@ -63,33 +78,18 @@ var _ = Describe("Drip file ilk transformer", func() {
 	})
 
 	It("fetches logs for missing headers", func() {
-		fetcher := &mocks.MockLogFetcher{}
-		repository := &ilk_mocks.MockDripFileIlkRepository{}
-		repository.SetMissingHeaders([]core.Header{{BlockNumber: 1}, {BlockNumber: 2}})
-		transformer := ilk.DripFileIlkTransformer{
-			Fetcher:    fetcher,
-			Converter:  &ilk_mocks.MockDripFileIlkConverter{},
-			Repository: repository,
-		}
-
+		repository.SetMissingHeaders([]core.Header{headerOne, headerTwo})
 		err := transformer.Execute()
 
 		Expect(err).NotTo(HaveOccurred())
-		Expect(fetcher.FetchedBlocks).To(Equal([]int64{1, 2}))
-		Expect(fetcher.FetchedContractAddresses).To(Equal([][]string{drip_file.DripFileConfig.ContractAddresses, drip_file.DripFileConfig.ContractAddresses}))
+		Expect(fetcher.FetchedBlocks).To(Equal([]int64{headerOne.BlockNumber, headerTwo.BlockNumber}))
+		Expect(fetcher.FetchedContractAddresses).To(Equal([][]string{config.ContractAddresses, config.ContractAddresses}))
 		Expect(fetcher.FetchedTopics).To(Equal([][]common.Hash{{common.HexToHash(shared.DripFileIlkSignature)}}))
 	})
 
 	It("returns error if fetcher returns error", func() {
-		fetcher := &mocks.MockLogFetcher{}
 		fetcher.SetFetcherError(fakes.FakeError)
-		repository := &ilk_mocks.MockDripFileIlkRepository{}
-		repository.SetMissingHeaders([]core.Header{{BlockNumber: 1}})
-		transformer := ilk.DripFileIlkTransformer{
-			Fetcher:    fetcher,
-			Converter:  &ilk_mocks.MockDripFileIlkConverter{},
-			Repository: repository,
-		}
+		repository.SetMissingHeaders([]core.Header{headerOne})
 
 		err := transformer.Execute()
 
@@ -98,34 +98,16 @@ var _ = Describe("Drip file ilk transformer", func() {
 	})
 
 	It("marks header checked if no logs returned", func() {
-		mockConverter := &ilk_mocks.MockDripFileIlkConverter{}
-		mockRepository := &ilk_mocks.MockDripFileIlkRepository{}
-		headerID := int64(123)
-		mockRepository.SetMissingHeaders([]core.Header{{Id: headerID}})
-		mockFetcher := &mocks.MockLogFetcher{}
-		transformer := ilk.DripFileIlkTransformer{
-			Converter:  mockConverter,
-			Fetcher:    mockFetcher,
-			Repository: mockRepository,
-		}
-
+		repository.SetMissingHeaders([]core.Header{headerOne})
 		err := transformer.Execute()
 
 		Expect(err).NotTo(HaveOccurred())
-		mockRepository.AssertMarkHeaderCheckedCalledWith(headerID)
+		repository.AssertMarkHeaderCheckedCalledWith(headerOne.Id)
 	})
 
 	It("returns error if marking header checked returns err", func() {
-		mockConverter := &ilk_mocks.MockDripFileIlkConverter{}
-		mockRepository := &ilk_mocks.MockDripFileIlkRepository{}
-		mockRepository.SetMissingHeaders([]core.Header{{Id: int64(123)}})
-		mockRepository.SetMarkHeaderCheckedErr(fakes.FakeError)
-		mockFetcher := &mocks.MockLogFetcher{}
-		transformer := ilk.DripFileIlkTransformer{
-			Converter:  mockConverter,
-			Fetcher:    mockFetcher,
-			Repository: mockRepository,
-		}
+		repository.SetMissingHeaders([]core.Header{headerOne})
+		repository.SetMarkHeaderCheckedError(fakes.FakeError)
 
 		err := transformer.Execute()
 
@@ -134,16 +116,8 @@ var _ = Describe("Drip file ilk transformer", func() {
 	})
 
 	It("converts matching logs", func() {
-		converter := &ilk_mocks.MockDripFileIlkConverter{}
-		fetcher := &mocks.MockLogFetcher{}
 		fetcher.SetFetchedLogs([]types.Log{test_data.EthDripFileIlkLog})
-		repository := &ilk_mocks.MockDripFileIlkRepository{}
-		repository.SetMissingHeaders([]core.Header{{BlockNumber: 1}})
-		transformer := ilk.DripFileIlkTransformer{
-			Fetcher:    fetcher,
-			Converter:  converter,
-			Repository: repository,
-		}
+		repository.SetMissingHeaders([]core.Header{headerOne})
 
 		err := transformer.Execute()
 
@@ -152,17 +126,9 @@ var _ = Describe("Drip file ilk transformer", func() {
 	})
 
 	It("returns error if converter returns error", func() {
-		converter := &ilk_mocks.MockDripFileIlkConverter{}
 		converter.SetConverterError(fakes.FakeError)
-		fetcher := &mocks.MockLogFetcher{}
 		fetcher.SetFetchedLogs([]types.Log{test_data.EthDripFileIlkLog})
-		repository := &ilk_mocks.MockDripFileIlkRepository{}
-		repository.SetMissingHeaders([]core.Header{{BlockNumber: 1}})
-		transformer := ilk.DripFileIlkTransformer{
-			Fetcher:    fetcher,
-			Converter:  converter,
-			Repository: repository,
-		}
+		repository.SetMissingHeaders([]core.Header{headerOne})
 
 		err := transformer.Execute()
 
@@ -171,37 +137,20 @@ var _ = Describe("Drip file ilk transformer", func() {
 	})
 
 	It("persists drip file model", func() {
-		converter := &ilk_mocks.MockDripFileIlkConverter{}
-		fetcher := &mocks.MockLogFetcher{}
 		fetcher.SetFetchedLogs([]types.Log{test_data.EthDripFileIlkLog})
-		repository := &ilk_mocks.MockDripFileIlkRepository{}
-		fakeHeader := core.Header{BlockNumber: 1, Id: 2}
-		repository.SetMissingHeaders([]core.Header{fakeHeader})
-		transformer := ilk.DripFileIlkTransformer{
-			Fetcher:    fetcher,
-			Converter:  converter,
-			Repository: repository,
-		}
+		repository.SetMissingHeaders([]core.Header{headerOne})
 
 		err := transformer.Execute()
 
 		Expect(err).NotTo(HaveOccurred())
-		Expect(repository.PassedHeaderID).To(Equal(fakeHeader.Id))
-		Expect(repository.PassedModels).To(Equal([]ilk.DripFileIlkModel{test_data.DripFileIlkModel}))
+		Expect(repository.PassedHeaderID).To(Equal(headerOne.Id))
+		Expect(repository.PassedModels).To(Equal([]interface{}{test_data.DripFileIlkModel}))
 	})
 
 	It("returns error if repository returns error for create", func() {
-		converter := &ilk_mocks.MockDripFileIlkConverter{}
-		fetcher := &mocks.MockLogFetcher{}
 		fetcher.SetFetchedLogs([]types.Log{test_data.EthDripFileIlkLog})
-		repository := &ilk_mocks.MockDripFileIlkRepository{}
-		repository.SetMissingHeaders([]core.Header{{BlockNumber: 1, Id: 2}})
+		repository.SetMissingHeaders([]core.Header{headerOne})
 		repository.SetCreateError(fakes.FakeError)
-		transformer := ilk.DripFileIlkTransformer{
-			Fetcher:    fetcher,
-			Converter:  converter,
-			Repository: repository,
-		}
 
 		err := transformer.Execute()
 

pkg/transformers/drip_file/repo/config.go

@@ -0,0 +1,26 @@
+// Copyright 2018 Vulcanize
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package repo
+
+import "github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
+
+var DripFileRepoConfig = shared.SingleTransformerConfig{
+	TransformerName:     shared.DripFileRepoLabel,
+	ContractAddresses:   []string{shared.DripContractAddress},
+	ContractAbi:         shared.DripABI,
+	Topic:               shared.DripFileRepoSignature,
+	StartingBlockNumber: 0,
+	EndingBlockNumber:   10000000,
+}

pkg/transformers/drip_file/repo/converter.go

@@ -22,25 +22,23 @@ import (
 	"math/big"
 )
 
-type Converter interface {
-	ToModels(ethLogs []types.Log) ([]DripFileRepoModel, error)
-}
-
 type DripFileRepoConverter struct{}
 
-func (DripFileRepoConverter) ToModels(ethLogs []types.Log) ([]DripFileRepoModel, error) {
-	var models []DripFileRepoModel
+func (DripFileRepoConverter) ToModels(ethLogs []types.Log) ([]interface{}, error) {
+	var models []interface{}
 	for _, ethLog := range ethLogs {
 		err := verifyLog(ethLog)
 		if err != nil {
 			return nil, err
 		}
+
 		what := string(bytes.Trim(ethLog.Topics[2].Bytes(), "\x00"))
 		data := big.NewInt(0).SetBytes(ethLog.Topics[3].Bytes()).String()
 		raw, err := json.Marshal(ethLog)
 		if err != nil {
 			return nil, err
 		}
+
 		model := DripFileRepoModel{
 			What:             what,
 			Data:             data,

pkg/transformers/drip_file/repo/converter_test.go

@@ -44,6 +44,6 @@ var _ = Describe("Drip file repo converter", func() {
 
 		Expect(err).NotTo(HaveOccurred())
 		Expect(len(models)).To(Equal(1))
-		Expect(models[0]).To(Equal(test_data.DripFileRepoModel))
+		Expect(models[0].(repo.DripFileRepoModel)).To(Equal(test_data.DripFileRepoModel))
 	})
 })

pkg/transformers/drip_file/repo/repository.go

@@ -15,56 +15,58 @@
 package repo
 
 import (
+	"fmt"
 	"github.com/vulcanize/vulcanizedb/pkg/core"
 	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
 )
 
-type Repository interface {
-	Create(headerID int64, models []DripFileRepoModel) error
-	MarkHeaderChecked(headerID int64) error
-	MissingHeaders(startingBlockNumber, endingBlockNumber int64) ([]core.Header, error)
-}
-
 type DripFileRepoRepository struct {
 	db *postgres.DB
 }
 
-func NewDripFileRepoRepository(db *postgres.DB) DripFileRepoRepository {
-	return DripFileRepoRepository{db: db}
-}
-
-func (repository DripFileRepoRepository) Create(headerID int64, models []DripFileRepoModel) error {
+func (repository DripFileRepoRepository) Create(headerID int64, models []interface{}) error {
 	tx, err := repository.db.Begin()
 	if err != nil {
 		return err
 	}
+
 	for _, model := range models {
+		repo, ok := model.(DripFileRepoModel)
+		if !ok {
+			tx.Rollback()
+			return fmt.Errorf("model of type %T, not %T", model, DripFileRepoModel{})
+		}
+
 		_, err = tx.Exec(
 			`INSERT into maker.drip_file_repo (header_id, what, data, log_idx, tx_idx, raw_log)
-        VALUES($1, $2, $3::NUMERIC, $4, $5, $6)`,
-			headerID, model.What, model.Data, model.LogIndex, model.TransactionIndex, model.Raw,
+        	VALUES($1, $2, $3::NUMERIC, $4, $5, $6)`,
+			headerID, repo.What, repo.Data, repo.LogIndex, repo.TransactionIndex, repo.Raw,
 		)
+
 		if err != nil {
 			tx.Rollback()
 			return err
 		}
 	}
+
 	_, err = tx.Exec(`INSERT INTO public.checked_headers (header_id, drip_file_repo_checked)
 		VALUES ($1, $2) 
-	ON CONFLICT (header_id) DO
-		UPDATE SET drip_file_repo_checked = $2`, headerID, true)
+		ON CONFLICT (header_id) DO
+			UPDATE SET drip_file_repo_checked = $2`, headerID, true)
+
 	if err != nil {
 		tx.Rollback()
 		return err
 	}
+
 	return tx.Commit()
 }
 
 func (repository DripFileRepoRepository) MarkHeaderChecked(headerID int64) error {
 	_, err := repository.db.Exec(`INSERT INTO public.checked_headers (header_id, drip_file_repo_checked)
 		VALUES ($1, $2) 
-	ON CONFLICT (header_id) DO
-		UPDATE SET drip_file_repo_checked = $2`, headerID, true)
+		ON CONFLICT (header_id) DO
+			UPDATE SET drip_file_repo_checked = $2`, headerID, true)
 	return err
 }
 
@@ -73,14 +75,18 @@ func (repository DripFileRepoRepository) MissingHeaders(startingBlockNumber, end
 	err := repository.db.Select(
 		&result,
 		`SELECT headers.id, headers.block_number FROM headers
-               LEFT JOIN checked_headers on headers.id = header_id
-               WHERE (header_id ISNULL OR drip_file_repo_checked IS FALSE)
-               AND headers.block_number >= $1
-               AND headers.block_number <= $2
-               AND headers.eth_node_fingerprint = $3`,
+			LEFT JOIN checked_headers on headers.id = header_id
+		WHERE (header_id ISNULL OR drip_file_repo_checked IS FALSE)
+			AND headers.block_number >= $1
+			AND headers.block_number <= $2
+			AND headers.eth_node_fingerprint = $3`,
 		startingBlockNumber,
 		endingBlockNumber,
 		repository.db.Node.ID,
 	)
 	return result, err
 }
+
+func (repository *DripFileRepoRepository) SetDB(db *postgres.DB) {
+	repository.db = db
+}

pkg/transformers/drip_file/repo/repository_test.go

@@ -16,6 +16,7 @@ package repo_test
 
 import (
 	"database/sql"
+	"math/rand"
 
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
@@ -33,7 +34,7 @@ import (
 var _ = Describe("Drip file repo repository", func() {
 	var (
 		db                     *postgres.DB
-		dripFileRepoRepository repo.Repository
+		dripFileRepoRepository repo.DripFileRepoRepository
 		err                    error
 		headerRepository       datastore.HeaderRepository
 	)
@@ -42,7 +43,8 @@ var _ = Describe("Drip file repo repository", func() {
 		db = test_config.NewTestDB(core.Node{})
 		test_config.CleanTestDB(db)
 		headerRepository = repositories.NewHeaderRepository(db)
-		dripFileRepoRepository = repo.NewDripFileRepoRepository(db)
+		dripFileRepoRepository = repo.DripFileRepoRepository{}
+		dripFileRepoRepository.SetDB(db)
 	})
 
 	Describe("Create", func() {
@@ -52,7 +54,7 @@ var _ = Describe("Drip file repo repository", func() {
 			headerID, err = headerRepository.CreateOrUpdateHeader(fakes.FakeHeader)
 			Expect(err).NotTo(HaveOccurred())
 
-			err = dripFileRepoRepository.Create(headerID, []repo.DripFileRepoModel{test_data.DripFileRepoModel})
+			err = dripFileRepoRepository.Create(headerID, []interface{}{test_data.DripFileRepoModel})
 			Expect(err).NotTo(HaveOccurred())
 		})
 
@@ -75,7 +77,7 @@ var _ = Describe("Drip file repo repository", func() {
 		})
 
 		It("does not duplicate drip file events", func() {
-			err = dripFileRepoRepository.Create(headerID, []repo.DripFileRepoModel{test_data.DripFileRepoModel})
+			err = dripFileRepoRepository.Create(headerID, []interface{}{test_data.DripFileRepoModel})
 
 			Expect(err).To(HaveOccurred())
 			Expect(err.Error()).To(ContainSubstring("pq: duplicate key value violates unique constraint"))
@@ -90,6 +92,12 @@ var _ = Describe("Drip file repo repository", func() {
 			Expect(err).To(HaveOccurred())
 			Expect(err).To(MatchError(sql.ErrNoRows))
 		})
+
+		It("Returns an error if model is of wrong type", func() {
+			err = dripFileRepoRepository.Create(headerID, []interface{}{test_data.WrongModel{}})
+			Expect(err).To(HaveOccurred())
+			Expect(err.Error()).To(ContainSubstring("model of type"))
+		})
 	})
 
 	Describe("MarkHeaderChecked", func() {
@@ -130,7 +138,7 @@ var _ = Describe("Drip file repo repository", func() {
 		)
 
 		BeforeEach(func() {
-			startingBlock = GinkgoRandomSeed()
+			startingBlock = rand.Int63()
 			dripFileBlock = startingBlock + 1
 			endingBlock = startingBlock + 2
 
@@ -176,7 +184,8 @@ var _ = Describe("Drip file repo repository", func() {
 				_, err = headerRepositoryTwo.CreateOrUpdateHeader(fakes.GetFakeHeader(n))
 				Expect(err).NotTo(HaveOccurred())
 			}
-			dripFileRepoRepositoryTwo := repo.NewDripFileRepoRepository(dbTwo)
+			dripFileRepoRepositoryTwo := repo.DripFileRepoRepository{}
+			dripFileRepoRepositoryTwo.SetDB(dbTwo)
 			err := dripFileRepoRepository.MarkHeaderChecked(headerIDs[0])
 			Expect(err).NotTo(HaveOccurred())
 

pkg/transformers/drip_file/repo/transformer.go

@@ -1,79 +0,0 @@
-// Copyright 2018 Vulcanize
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package repo
-
-import (
-	"log"
-
-	"github.com/ethereum/go-ethereum/common"
-
-	"github.com/vulcanize/vulcanizedb/pkg/core"
-	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/drip_file"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
-)
-
-type DripFileRepoTransformer struct {
-	Config     shared.TransformerConfig
-	Converter  Converter
-	Fetcher    shared.LogFetcher
-	Repository Repository
-}
-
-type DripFileRepoTransformerInitializer struct {
-	Config shared.TransformerConfig
-}
-
-func (initializer DripFileRepoTransformerInitializer) NewDripFileRepoTransformer(db *postgres.DB, blockChain core.BlockChain) shared.Transformer {
-	converter := DripFileRepoConverter{}
-	fetcher := shared.NewFetcher(blockChain)
-	repository := NewDripFileRepoRepository(db)
-	return DripFileRepoTransformer{
-		Config:     initializer.Config,
-		Converter:  converter,
-		Fetcher:    fetcher,
-		Repository: repository,
-	}
-}
-
-func (transformer DripFileRepoTransformer) Execute() error {
-	missingHeaders, err := transformer.Repository.MissingHeaders(transformer.Config.StartingBlockNumber, transformer.Config.EndingBlockNumber)
-	if err != nil {
-		return err
-	}
-	log.Printf("Fetching drip file repo event logs for %d headers \n", len(missingHeaders))
-	for _, header := range missingHeaders {
-		topics := [][]common.Hash{{common.HexToHash(shared.DripFileRepoSignature)}}
-		matchingLogs, err := transformer.Fetcher.FetchLogs(drip_file.DripFileConfig.ContractAddresses, topics, header.BlockNumber)
-		if err != nil {
-			return err
-		}
-		if len(matchingLogs) < 1 {
-			err = transformer.Repository.MarkHeaderChecked(header.Id)
-			if err != nil {
-				return err
-			}
-		}
-		model, err := transformer.Converter.ToModels(matchingLogs)
-		if err != nil {
-			return err
-		}
-		err = transformer.Repository.Create(header.Id, model)
-		if err != nil {
-			return err
-		}
-	}
-	return nil
-}

pkg/transformers/drip_file/repo/transformer_test.go

@@ -19,10 +19,11 @@ import (
 	"github.com/ethereum/go-ethereum/core/types"
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/factories"
+	"math/rand"
 
 	"github.com/vulcanize/vulcanizedb/pkg/core"
 	"github.com/vulcanize/vulcanizedb/pkg/fakes"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/drip_file"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/drip_file/repo"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/test_data"
@@ -31,31 +32,45 @@ import (
 )
 
 var _ = Describe("Drip file repo transformer", func() {
-	It("gets missing headers for block numbers specified in config", func() {
-		repository := &repo_mocks.MockDripFileRepoRepository{}
-		transformer := repo.DripFileRepoTransformer{
-			Config:     drip_file.DripFileConfig,
-			Fetcher:    &mocks.MockLogFetcher{},
-			Converter:  &repo_mocks.MockDripFileRepoConverter{},
-			Repository: repository,
-		}
+	var (
+		config      = repo.DripFileRepoConfig
+		fetcher     mocks.MockLogFetcher
+		converter   repo_mocks.MockDripFileRepoConverter
+		repository  repo_mocks.MockDripFileRepoRepository
+		transformer shared.Transformer
+		headerOne   core.Header
+		headerTwo   core.Header
+	)
 
+	BeforeEach(func() {
+		fetcher = mocks.MockLogFetcher{}
+		converter = repo_mocks.MockDripFileRepoConverter{}
+		repository = repo_mocks.MockDripFileRepoRepository{}
+		transformer = factories.Transformer{
+			Config:     config,
+			Fetcher:    &fetcher,
+			Converter:  &converter,
+			Repository: &repository,
+		}.NewTransformer(nil, nil)
+		headerOne = core.Header{BlockNumber: rand.Int63(), Id: rand.Int63()}
+		headerTwo = core.Header{BlockNumber: rand.Int63(), Id: rand.Int63()}
+	})
+
+	It("sets the blockchain and database", func() {
+		Expect(fetcher.SetBcCalled).To(BeTrue())
+		Expect(repository.SetDbCalled).To(BeTrue())
+	})
+
+	It("gets missing headers for block numbers specified in config", func() {
 		err := transformer.Execute()
 
 		Expect(err).NotTo(HaveOccurred())
-		Expect(repository.PassedStartingBlockNumber).To(Equal(drip_file.DripFileConfig.StartingBlockNumber))
-		Expect(repository.PassedEndingBlockNumber).To(Equal(drip_file.DripFileConfig.EndingBlockNumber))
+		Expect(repository.PassedStartingBlockNumber).To(Equal(config.StartingBlockNumber))
+		Expect(repository.PassedEndingBlockNumber).To(Equal(config.EndingBlockNumber))
 	})
 
 	It("returns error if repository returns error for missing headers", func() {
-		repository := &repo_mocks.MockDripFileRepoRepository{}
-		repository.SetMissingHeadersErr(fakes.FakeError)
-		transformer := repo.DripFileRepoTransformer{
-			Fetcher:    &mocks.MockLogFetcher{},
-			Converter:  &repo_mocks.MockDripFileRepoConverter{},
-			Repository: repository,
-		}
-
+		repository.SetMissingHeadersError(fakes.FakeError)
 		err := transformer.Execute()
 
 		Expect(err).To(HaveOccurred())
@@ -63,33 +78,18 @@ var _ = Describe("Drip file repo transformer", func() {
 	})
 
 	It("fetches logs for missing headers", func() {
-		fetcher := &mocks.MockLogFetcher{}
-		repository := &repo_mocks.MockDripFileRepoRepository{}
-		repository.SetMissingHeaders([]core.Header{{BlockNumber: 1}, {BlockNumber: 2}})
-		transformer := repo.DripFileRepoTransformer{
-			Fetcher:    fetcher,
-			Converter:  &repo_mocks.MockDripFileRepoConverter{},
-			Repository: repository,
-		}
-
+		repository.SetMissingHeaders([]core.Header{headerOne, headerTwo})
 		err := transformer.Execute()
 
 		Expect(err).NotTo(HaveOccurred())
-		Expect(fetcher.FetchedBlocks).To(Equal([]int64{1, 2}))
-		Expect(fetcher.FetchedContractAddresses).To(Equal([][]string{drip_file.DripFileConfig.ContractAddresses, drip_file.DripFileConfig.ContractAddresses}))
+		Expect(fetcher.FetchedBlocks).To(Equal([]int64{headerOne.BlockNumber, headerTwo.BlockNumber}))
+		Expect(fetcher.FetchedContractAddresses).To(Equal([][]string{config.ContractAddresses, config.ContractAddresses}))
 		Expect(fetcher.FetchedTopics).To(Equal([][]common.Hash{{common.HexToHash(shared.DripFileRepoSignature)}}))
 	})
 
 	It("returns error if fetcher returns error", func() {
-		fetcher := &mocks.MockLogFetcher{}
 		fetcher.SetFetcherError(fakes.FakeError)
-		repository := &repo_mocks.MockDripFileRepoRepository{}
-		repository.SetMissingHeaders([]core.Header{{BlockNumber: 1}})
-		transformer := repo.DripFileRepoTransformer{
-			Fetcher:    fetcher,
-			Converter:  &repo_mocks.MockDripFileRepoConverter{},
-			Repository: repository,
-		}
+		repository.SetMissingHeaders([]core.Header{headerOne})
 
 		err := transformer.Execute()
 
@@ -98,34 +98,16 @@ var _ = Describe("Drip file repo transformer", func() {
 	})
 
 	It("marks header checked if no logs returned", func() {
-		mockConverter := &repo_mocks.MockDripFileRepoConverter{}
-		mockRepository := &repo_mocks.MockDripFileRepoRepository{}
-		headerID := int64(123)
-		mockRepository.SetMissingHeaders([]core.Header{{Id: headerID}})
-		mockFetcher := &mocks.MockLogFetcher{}
-		transformer := repo.DripFileRepoTransformer{
-			Converter:  mockConverter,
-			Fetcher:    mockFetcher,
-			Repository: mockRepository,
-		}
-
+		repository.SetMissingHeaders([]core.Header{headerOne})
 		err := transformer.Execute()
 
 		Expect(err).NotTo(HaveOccurred())
-		mockRepository.AssertMarkHeaderCheckedCalledWith(headerID)
+		repository.AssertMarkHeaderCheckedCalledWith(headerOne.Id)
 	})
 
 	It("returns error if marking header checked returns err", func() {
-		mockConverter := &repo_mocks.MockDripFileRepoConverter{}
-		mockRepository := &repo_mocks.MockDripFileRepoRepository{}
-		mockRepository.SetMissingHeaders([]core.Header{{Id: int64(123)}})
-		mockRepository.SetMarkHeaderCheckedErr(fakes.FakeError)
-		mockFetcher := &mocks.MockLogFetcher{}
-		transformer := repo.DripFileRepoTransformer{
-			Converter:  mockConverter,
-			Fetcher:    mockFetcher,
-			Repository: mockRepository,
-		}
+		repository.SetMissingHeaders([]core.Header{headerOne})
+		repository.SetMarkHeaderCheckedError(fakes.FakeError)
 
 		err := transformer.Execute()
 
@@ -134,16 +116,8 @@ var _ = Describe("Drip file repo transformer", func() {
 	})
 
 	It("converts matching logs", func() {
-		converter := &repo_mocks.MockDripFileRepoConverter{}
-		fetcher := &mocks.MockLogFetcher{}
 		fetcher.SetFetchedLogs([]types.Log{test_data.EthDripFileRepoLog})
-		repository := &repo_mocks.MockDripFileRepoRepository{}
-		repository.SetMissingHeaders([]core.Header{{BlockNumber: 1}})
-		transformer := repo.DripFileRepoTransformer{
-			Fetcher:    fetcher,
-			Converter:  converter,
-			Repository: repository,
-		}
+		repository.SetMissingHeaders([]core.Header{headerOne})
 
 		err := transformer.Execute()
 
@@ -152,17 +126,9 @@ var _ = Describe("Drip file repo transformer", func() {
 	})
 
 	It("returns error if converter returns error", func() {
-		converter := &repo_mocks.MockDripFileRepoConverter{}
 		converter.SetConverterError(fakes.FakeError)
-		fetcher := &mocks.MockLogFetcher{}
 		fetcher.SetFetchedLogs([]types.Log{test_data.EthDripFileRepoLog})
-		repository := &repo_mocks.MockDripFileRepoRepository{}
-		repository.SetMissingHeaders([]core.Header{{BlockNumber: 1}})
-		transformer := repo.DripFileRepoTransformer{
-			Fetcher:    fetcher,
-			Converter:  converter,
-			Repository: repository,
-		}
+		repository.SetMissingHeaders([]core.Header{headerOne})
 
 		err := transformer.Execute()
 
@@ -171,37 +137,20 @@ var _ = Describe("Drip file repo transformer", func() {
 	})
 
 	It("persists drip file model", func() {
-		converter := &repo_mocks.MockDripFileRepoConverter{}
-		fetcher := &mocks.MockLogFetcher{}
 		fetcher.SetFetchedLogs([]types.Log{test_data.EthDripFileRepoLog})
-		repository := &repo_mocks.MockDripFileRepoRepository{}
-		fakeHeader := core.Header{BlockNumber: 1, Id: 2}
-		repository.SetMissingHeaders([]core.Header{fakeHeader})
-		transformer := repo.DripFileRepoTransformer{
-			Fetcher:    fetcher,
-			Converter:  converter,
-			Repository: repository,
-		}
+		repository.SetMissingHeaders([]core.Header{headerOne})
 
 		err := transformer.Execute()
 
 		Expect(err).NotTo(HaveOccurred())
-		Expect(repository.PassedHeaderID).To(Equal(fakeHeader.Id))
-		Expect(repository.PassedModels).To(Equal([]repo.DripFileRepoModel{test_data.DripFileRepoModel}))
+		Expect(repository.PassedHeaderID).To(Equal(headerOne.Id))
+		Expect(repository.PassedModels).To(Equal([]interface{}{test_data.DripFileRepoModel}))
 	})
 
 	It("returns error if repository returns error for create", func() {
-		converter := &repo_mocks.MockDripFileRepoConverter{}
-		fetcher := &mocks.MockLogFetcher{}
 		fetcher.SetFetchedLogs([]types.Log{test_data.EthDripFileRepoLog})
-		repository := &repo_mocks.MockDripFileRepoRepository{}
-		repository.SetMissingHeaders([]core.Header{{BlockNumber: 1, Id: 2}})
+		repository.SetMissingHeaders([]core.Header{headerOne})
 		repository.SetCreateError(fakes.FakeError)
-		transformer := repo.DripFileRepoTransformer{
-			Fetcher:    fetcher,
-			Converter:  converter,
-			Repository: repository,
-		}
 
 		err := transformer.Execute()
 

pkg/transformers/drip_file/vow/config.go

@@ -0,0 +1,26 @@
+// Copyright 2018 Vulcanize
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package vow
+
+import "github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
+
+var DripFileVowConfig = shared.SingleTransformerConfig{
+	TransformerName:     shared.DripFileVowLabel,
+	ContractAddresses:   []string{shared.DripContractAddress},
+	ContractAbi:         shared.DripABI,
+	Topic:               shared.DripFileVowSignature,
+	StartingBlockNumber: 0,
+	EndingBlockNumber:   10000000,
+}

pkg/transformers/drip_file/vow/converter.go

@@ -22,25 +22,23 @@ import (
 	"github.com/ethereum/go-ethereum/core/types"
 )
 
-type Converter interface {
-	ToModels(ethLogs []types.Log) ([]DripFileVowModel, error)
-}
-
 type DripFileVowConverter struct{}
 
-func (DripFileVowConverter) ToModels(ethLogs []types.Log) ([]DripFileVowModel, error) {
-	var models []DripFileVowModel
+func (DripFileVowConverter) ToModels(ethLogs []types.Log) ([]interface{}, error) {
+	var models []interface{}
 	for _, ethLog := range ethLogs {
 		err := verifyLog(ethLog)
 		if err != nil {
 			return nil, err
 		}
+
 		what := string(bytes.Trim(ethLog.Topics[2].Bytes(), "\x00"))
 		data := common.BytesToAddress(ethLog.Topics[3].Bytes()).String()
 		raw, err := json.Marshal(ethLog)
 		if err != nil {
 			return nil, err
 		}
+
 		model := DripFileVowModel{
 			What:             what,
 			Data:             data,

pkg/transformers/drip_file/vow/converter_test.go

@@ -44,6 +44,6 @@ var _ = Describe("Drip file repo converter", func() {
 
 		Expect(err).NotTo(HaveOccurred())
 		Expect(len(models)).To(Equal(1))
-		Expect(models[0]).To(Equal(test_data.DripFileVowModel))
+		Expect(models[0].(vow.DripFileVowModel)).To(Equal(test_data.DripFileVowModel))
 	})
 })

pkg/transformers/drip_file/vow/repository.go

@@ -15,56 +15,57 @@
 package vow
 
 import (
+	"fmt"
 	"github.com/vulcanize/vulcanizedb/pkg/core"
 	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
 )
 
-type Repository interface {
-	Create(headerID int64, models []DripFileVowModel) error
-	MarkHeaderChecked(headerID int64) error
-	MissingHeaders(startingBlockNumber, endingBlockNumber int64) ([]core.Header, error)
-}
-
 type DripFileVowRepository struct {
 	db *postgres.DB
 }
 
-func NewDripFileVowRepository(db *postgres.DB) DripFileVowRepository {
-	return DripFileVowRepository{db: db}
-}
-
-func (repository DripFileVowRepository) Create(headerID int64, models []DripFileVowModel) error {
+func (repository DripFileVowRepository) Create(headerID int64, models []interface{}) error {
 	tx, err := repository.db.Begin()
 	if err != nil {
 		return err
 	}
+
 	for _, model := range models {
+		vow, ok := model.(DripFileVowModel)
+		if !ok {
+			tx.Rollback()
+			return fmt.Errorf("model of type %T, not %T", model, DripFileVowModel{})
+		}
+
 		_, err = tx.Exec(
 			`INSERT into maker.drip_file_vow (header_id, what, data, log_idx, tx_idx, raw_log)
-        VALUES($1, $2, $3, $4, $5, $6)`,
-			headerID, model.What, model.Data, model.LogIndex, model.TransactionIndex, model.Raw,
+        	VALUES($1, $2, $3, $4, $5, $6)`,
+			headerID, vow.What, vow.Data, vow.LogIndex, vow.TransactionIndex, vow.Raw,
 		)
 		if err != nil {
 			tx.Rollback()
 			return err
 		}
 	}
+
 	_, err = tx.Exec(`INSERT INTO public.checked_headers (header_id, drip_file_vow_checked)
 		VALUES ($1, $2) 
-	ON CONFLICT (header_id) DO
-		UPDATE SET drip_file_vow_checked = $2`, headerID, true)
+		ON CONFLICT (header_id) DO
+			UPDATE SET drip_file_vow_checked = $2`, headerID, true)
+
 	if err != nil {
 		tx.Rollback()
 		return err
 	}
+
 	return tx.Commit()
 }
 
 func (repository DripFileVowRepository) MarkHeaderChecked(headerID int64) error {
 	_, err := repository.db.Exec(`INSERT INTO public.checked_headers (header_id, drip_file_vow_checked)
 		VALUES ($1, $2) 
-	ON CONFLICT (header_id) DO
-		UPDATE SET drip_file_vow_checked = $2`, headerID, true)
+		ON CONFLICT (header_id) DO
+			UPDATE SET drip_file_vow_checked = $2`, headerID, true)
 	return err
 }
 
@@ -73,14 +74,18 @@ func (repository DripFileVowRepository) MissingHeaders(startingBlockNumber, endi
 	err := repository.db.Select(
 		&result,
 		`SELECT headers.id, headers.block_number FROM headers
-               LEFT JOIN checked_headers on headers.id = header_id
-               WHERE (header_id ISNULL OR drip_file_vow_checked IS FALSE)
-               AND headers.block_number >= $1
-               AND headers.block_number <= $2
-               AND headers.eth_node_fingerprint = $3`,
+			LEFT JOIN checked_headers on headers.id = header_id
+		WHERE (header_id ISNULL OR drip_file_vow_checked IS FALSE)
+			AND headers.block_number >= $1
+			AND headers.block_number <= $2
+			AND headers.eth_node_fingerprint = $3`,
 		startingBlockNumber,
 		endingBlockNumber,
 		repository.db.Node.ID,
 	)
 	return result, err
 }
+
+func (repository *DripFileVowRepository) SetDB(db *postgres.DB) {
+	repository.db = db
+}

pkg/transformers/drip_file/vow/repository_test.go

@@ -16,6 +16,7 @@ package vow_test
 
 import (
 	"database/sql"
+	"math/rand"
 
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
@@ -33,7 +34,7 @@ import (
 var _ = Describe("Drip file vow repository", func() {
 	var (
 		db                    *postgres.DB
-		dripFileVowRepository vow.Repository
+		dripFileVowRepository vow.DripFileVowRepository
 		err                   error
 		headerRepository      datastore.HeaderRepository
 	)
@@ -42,7 +43,8 @@ var _ = Describe("Drip file vow repository", func() {
 		db = test_config.NewTestDB(core.Node{})
 		test_config.CleanTestDB(db)
 		headerRepository = repositories.NewHeaderRepository(db)
-		dripFileVowRepository = vow.NewDripFileVowRepository(db)
+		dripFileVowRepository = vow.DripFileVowRepository{}
+		dripFileVowRepository.SetDB(db)
 	})
 
 	Describe("Create", func() {
@@ -52,7 +54,7 @@ var _ = Describe("Drip file vow repository", func() {
 			headerID, err = headerRepository.CreateOrUpdateHeader(fakes.FakeHeader)
 			Expect(err).NotTo(HaveOccurred())
 
-			err = dripFileVowRepository.Create(headerID, []vow.DripFileVowModel{test_data.DripFileVowModel})
+			err = dripFileVowRepository.Create(headerID, []interface{}{test_data.DripFileVowModel})
 			Expect(err).NotTo(HaveOccurred())
 		})
 
@@ -75,7 +77,7 @@ var _ = Describe("Drip file vow repository", func() {
 		})
 
 		It("does not duplicate drip file events", func() {
-			err = dripFileVowRepository.Create(headerID, []vow.DripFileVowModel{test_data.DripFileVowModel})
+			err = dripFileVowRepository.Create(headerID, []interface{}{test_data.DripFileVowModel})
 
 			Expect(err).To(HaveOccurred())
 			Expect(err.Error()).To(ContainSubstring("pq: duplicate key value violates unique constraint"))
@@ -90,6 +92,12 @@ var _ = Describe("Drip file vow repository", func() {
 			Expect(err).To(HaveOccurred())
 			Expect(err).To(MatchError(sql.ErrNoRows))
 		})
+
+		It("Returns an error if model is of wrong type", func() {
+			err = dripFileVowRepository.Create(headerID, []interface{}{test_data.WrongModel{}})
+			Expect(err).To(HaveOccurred())
+			Expect(err.Error()).To(ContainSubstring("model of type"))
+		})
 	})
 
 	Describe("MarkHeaderChecked", func() {
@@ -130,7 +138,7 @@ var _ = Describe("Drip file vow repository", func() {
 		)
 
 		BeforeEach(func() {
-			startingBlock = GinkgoRandomSeed()
+			startingBlock = rand.Int63()
 			dripFileBlock = startingBlock + 1
 			endingBlock = startingBlock + 2
 
@@ -176,7 +184,8 @@ var _ = Describe("Drip file vow repository", func() {
 				_, err = headerRepositoryTwo.CreateOrUpdateHeader(fakes.GetFakeHeader(n))
 				Expect(err).NotTo(HaveOccurred())
 			}
-			dripFileVowRepositoryTwo := vow.NewDripFileVowRepository(dbTwo)
+			dripFileVowRepositoryTwo := vow.DripFileVowRepository{}
+			dripFileVowRepositoryTwo.SetDB(dbTwo)
 			err := dripFileVowRepository.MarkHeaderChecked(headerIDs[0])
 			Expect(err).NotTo(HaveOccurred())
 

pkg/transformers/drip_file/vow/transformer.go

@@ -1,79 +0,0 @@
-// Copyright 2018 Vulcanize
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package vow
-
-import (
-	"log"
-
-	"github.com/ethereum/go-ethereum/common"
-
-	"github.com/vulcanize/vulcanizedb/pkg/core"
-	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/drip_file"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
-)
-
-type DripFileVowTransformerInitializer struct {
-	Config shared.TransformerConfig
-}
-
-func (initializer DripFileVowTransformerInitializer) NewDripFileVowTransformer(db *postgres.DB, blockChain core.BlockChain) shared.Transformer {
-	converter := DripFileVowConverter{}
-	fetcher := shared.NewFetcher(blockChain)
-	repository := NewDripFileVowRepository(db)
-	return DripFileVowTransformer{
-		Config:     initializer.Config,
-		Converter:  converter,
-		Fetcher:    fetcher,
-		Repository: repository,
-	}
-}
-
-type DripFileVowTransformer struct {
-	Config     shared.TransformerConfig
-	Converter  Converter
-	Fetcher    shared.LogFetcher
-	Repository Repository
-}
-
-func (transformer DripFileVowTransformer) Execute() error {
-	missingHeaders, err := transformer.Repository.MissingHeaders(transformer.Config.StartingBlockNumber, transformer.Config.EndingBlockNumber)
-	if err != nil {
-		return err
-	}
-	log.Printf("Fetching drip file vow event logs for %d headers \n", len(missingHeaders))
-	for _, header := range missingHeaders {
-		topics := [][]common.Hash{{common.HexToHash(shared.DripFileVowSignature)}}
-		matchingLogs, err := transformer.Fetcher.FetchLogs(drip_file.DripFileConfig.ContractAddresses, topics, header.BlockNumber)
-		if err != nil {
-			return err
-		}
-		if len(matchingLogs) < 1 {
-			err = transformer.Repository.MarkHeaderChecked(header.Id)
-			if err != nil {
-				return err
-			}
-		}
-		model, err := transformer.Converter.ToModels(matchingLogs)
-		if err != nil {
-			return err
-		}
-		err = transformer.Repository.Create(header.Id, model)
-		if err != nil {
-			return err
-		}
-	}
-	return nil
-}

pkg/transformers/drip_file/vow/transformer_test.go

@@ -19,10 +19,11 @@ import (
 	"github.com/ethereum/go-ethereum/core/types"
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/factories"
+	"math/rand"
 
 	"github.com/vulcanize/vulcanizedb/pkg/core"
 	"github.com/vulcanize/vulcanizedb/pkg/fakes"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/drip_file"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/drip_file/vow"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/test_data"
@@ -31,31 +32,45 @@ import (
 )
 
 var _ = Describe("Drip file vow transformer", func() {
-	It("gets missing headers for block numbers specified in config", func() {
-		repository := &vow_mocks.MockDripFileVowRepository{}
-		transformer := vow.DripFileVowTransformer{
-			Config:     drip_file.DripFileConfig,
-			Fetcher:    &mocks.MockLogFetcher{},
-			Converter:  &vow_mocks.MockDripFileVowConverter{},
-			Repository: repository,
-		}
+	var (
+		config      = vow.DripFileVowConfig
+		fetcher     mocks.MockLogFetcher
+		converter   vow_mocks.MockDripFileVowConverter
+		repository  vow_mocks.MockDripFileVowRepository
+		transformer shared.Transformer
+		headerOne   core.Header
+		headerTwo   core.Header
+	)
 
+	BeforeEach(func() {
+		fetcher = mocks.MockLogFetcher{}
+		converter = vow_mocks.MockDripFileVowConverter{}
+		repository = vow_mocks.MockDripFileVowRepository{}
+		transformer = factories.Transformer{
+			Config:     config,
+			Fetcher:    &fetcher,
+			Converter:  &converter,
+			Repository: &repository,
+		}.NewTransformer(nil, nil)
+		headerOne = core.Header{BlockNumber: rand.Int63(), Id: rand.Int63()}
+		headerTwo = core.Header{BlockNumber: rand.Int63(), Id: rand.Int63()}
+	})
+
+	It("sets the blockchain and database", func() {
+		Expect(fetcher.SetBcCalled).To(BeTrue())
+		Expect(repository.SetDbCalled).To(BeTrue())
+	})
+
+	It("gets missing headers for block numbers specified in config", func() {
 		err := transformer.Execute()
 
 		Expect(err).NotTo(HaveOccurred())
-		Expect(repository.PassedStartingBlockNumber).To(Equal(drip_file.DripFileConfig.StartingBlockNumber))
-		Expect(repository.PassedEndingBlockNumber).To(Equal(drip_file.DripFileConfig.EndingBlockNumber))
+		Expect(repository.PassedStartingBlockNumber).To(Equal(config.StartingBlockNumber))
+		Expect(repository.PassedEndingBlockNumber).To(Equal(config.EndingBlockNumber))
 	})
 
 	It("returns error if repository returns error for missing headers", func() {
-		repository := &vow_mocks.MockDripFileVowRepository{}
-		repository.SetMissingHeadersErr(fakes.FakeError)
-		transformer := vow.DripFileVowTransformer{
-			Fetcher:    &mocks.MockLogFetcher{},
-			Converter:  &vow_mocks.MockDripFileVowConverter{},
-			Repository: repository,
-		}
-
+		repository.SetMissingHeadersError(fakes.FakeError)
 		err := transformer.Execute()
 
 		Expect(err).To(HaveOccurred())
@@ -63,33 +78,18 @@ var _ = Describe("Drip file vow transformer", func() {
 	})
 
 	It("fetches logs for missing headers", func() {
-		fetcher := &mocks.MockLogFetcher{}
-		repository := &vow_mocks.MockDripFileVowRepository{}
-		repository.SetMissingHeaders([]core.Header{{BlockNumber: 1}, {BlockNumber: 2}})
-		transformer := vow.DripFileVowTransformer{
-			Fetcher:    fetcher,
-			Converter:  &vow_mocks.MockDripFileVowConverter{},
-			Repository: repository,
-		}
-
+		repository.SetMissingHeaders([]core.Header{headerOne, headerTwo})
 		err := transformer.Execute()
 
 		Expect(err).NotTo(HaveOccurred())
-		Expect(fetcher.FetchedBlocks).To(Equal([]int64{1, 2}))
-		Expect(fetcher.FetchedContractAddresses).To(Equal([][]string{drip_file.DripFileConfig.ContractAddresses, drip_file.DripFileConfig.ContractAddresses}))
+		Expect(fetcher.FetchedBlocks).To(Equal([]int64{headerOne.BlockNumber, headerTwo.BlockNumber}))
+		Expect(fetcher.FetchedContractAddresses).To(Equal([][]string{config.ContractAddresses, config.ContractAddresses}))
 		Expect(fetcher.FetchedTopics).To(Equal([][]common.Hash{{common.HexToHash(shared.DripFileVowSignature)}}))
 	})
 
 	It("returns error if fetcher returns error", func() {
-		fetcher := &mocks.MockLogFetcher{}
 		fetcher.SetFetcherError(fakes.FakeError)
-		repository := &vow_mocks.MockDripFileVowRepository{}
-		repository.SetMissingHeaders([]core.Header{{BlockNumber: 1}})
-		transformer := vow.DripFileVowTransformer{
-			Fetcher:    fetcher,
-			Converter:  &vow_mocks.MockDripFileVowConverter{},
-			Repository: repository,
-		}
+		repository.SetMissingHeaders([]core.Header{headerOne})
 
 		err := transformer.Execute()
 
@@ -98,34 +98,16 @@ var _ = Describe("Drip file vow transformer", func() {
 	})
 
 	It("marks header checked if no logs returned", func() {
-		mockConverter := &vow_mocks.MockDripFileVowConverter{}
-		mockRepository := &vow_mocks.MockDripFileVowRepository{}
-		headerID := int64(123)
-		mockRepository.SetMissingHeaders([]core.Header{{Id: headerID}})
-		mockFetcher := &mocks.MockLogFetcher{}
-		transformer := vow.DripFileVowTransformer{
-			Converter:  mockConverter,
-			Fetcher:    mockFetcher,
-			Repository: mockRepository,
-		}
-
+		repository.SetMissingHeaders([]core.Header{headerOne})
 		err := transformer.Execute()
 
 		Expect(err).NotTo(HaveOccurred())
-		mockRepository.AssertMarkHeaderCheckedCalledWith(headerID)
+		repository.AssertMarkHeaderCheckedCalledWith(headerOne.Id)
 	})
 
 	It("returns error if marking header checked returns err", func() {
-		mockConverter := &vow_mocks.MockDripFileVowConverter{}
-		mockRepository := &vow_mocks.MockDripFileVowRepository{}
-		mockRepository.SetMissingHeaders([]core.Header{{Id: int64(123)}})
-		mockRepository.SetMarkHeaderCheckedErr(fakes.FakeError)
-		mockFetcher := &mocks.MockLogFetcher{}
-		transformer := vow.DripFileVowTransformer{
-			Converter:  mockConverter,
-			Fetcher:    mockFetcher,
-			Repository: mockRepository,
-		}
+		repository.SetMissingHeaders([]core.Header{headerOne})
+		repository.SetMarkHeaderCheckedError(fakes.FakeError)
 
 		err := transformer.Execute()
 
@@ -134,16 +116,8 @@ var _ = Describe("Drip file vow transformer", func() {
 	})
 
 	It("converts matching logs", func() {
-		converter := &vow_mocks.MockDripFileVowConverter{}
-		fetcher := &mocks.MockLogFetcher{}
 		fetcher.SetFetchedLogs([]types.Log{test_data.EthDripFileVowLog})
-		repository := &vow_mocks.MockDripFileVowRepository{}
-		repository.SetMissingHeaders([]core.Header{{BlockNumber: 1}})
-		transformer := vow.DripFileVowTransformer{
-			Fetcher:    fetcher,
-			Converter:  converter,
-			Repository: repository,
-		}
+		repository.SetMissingHeaders([]core.Header{headerOne})
 
 		err := transformer.Execute()
 
@@ -152,17 +126,9 @@ var _ = Describe("Drip file vow transformer", func() {
 	})
 
 	It("returns error if converter returns error", func() {
-		converter := &vow_mocks.MockDripFileVowConverter{}
 		converter.SetConverterError(fakes.FakeError)
-		fetcher := &mocks.MockLogFetcher{}
 		fetcher.SetFetchedLogs([]types.Log{test_data.EthDripFileVowLog})
-		repository := &vow_mocks.MockDripFileVowRepository{}
-		repository.SetMissingHeaders([]core.Header{{BlockNumber: 1}})
-		transformer := vow.DripFileVowTransformer{
-			Fetcher:    fetcher,
-			Converter:  converter,
-			Repository: repository,
-		}
+		repository.SetMissingHeaders([]core.Header{headerOne})
 
 		err := transformer.Execute()
 
@@ -171,37 +137,20 @@ var _ = Describe("Drip file vow transformer", func() {
 	})
 
 	It("persists drip file model", func() {
-		converter := &vow_mocks.MockDripFileVowConverter{}
-		fetcher := &mocks.MockLogFetcher{}
 		fetcher.SetFetchedLogs([]types.Log{test_data.EthDripFileVowLog})
-		repository := &vow_mocks.MockDripFileVowRepository{}
-		fakeHeader := core.Header{BlockNumber: 1, Id: 2}
-		repository.SetMissingHeaders([]core.Header{fakeHeader})
-		transformer := vow.DripFileVowTransformer{
-			Fetcher:    fetcher,
-			Converter:  converter,
-			Repository: repository,
-		}
+		repository.SetMissingHeaders([]core.Header{headerOne})
 
 		err := transformer.Execute()
 
 		Expect(err).NotTo(HaveOccurred())
-		Expect(repository.PassedHeaderID).To(Equal(fakeHeader.Id))
-		Expect(repository.PassedModels).To(Equal([]vow.DripFileVowModel{test_data.DripFileVowModel}))
+		Expect(repository.PassedHeaderID).To(Equal(headerOne.Id))
+		Expect(repository.PassedModels).To(Equal([]interface{}{test_data.DripFileVowModel}))
 	})
 
 	It("returns error if repository returns error for create", func() {
-		converter := &vow_mocks.MockDripFileVowConverter{}
-		fetcher := &mocks.MockLogFetcher{}
 		fetcher.SetFetchedLogs([]types.Log{test_data.EthDripFileVowLog})
-		repository := &vow_mocks.MockDripFileVowRepository{}
-		repository.SetMissingHeaders([]core.Header{{BlockNumber: 1, Id: 2}})
+		repository.SetMissingHeaders([]core.Header{headerOne})
 		repository.SetCreateError(fakes.FakeError)
-		transformer := vow.DripFileVowTransformer{
-			Fetcher:    fetcher,
-			Converter:  converter,
-			Repository: repository,
-		}
 
 		err := transformer.Execute()
 

pkg/transformers/factories/transformer.go

@@ -0,0 +1,97 @@
+// Copyright 2018 Vulcanize
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package factories
+
+import (
+	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
+	"log"
+
+	"github.com/ethereum/go-ethereum/common"
+
+	"github.com/vulcanize/vulcanizedb/pkg/core"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
+)
+
+type Transformer struct {
+	Config     shared.SingleTransformerConfig
+	Converter  Converter
+	Repository Repository
+	Fetcher    shared.SettableLogFetcher
+}
+
+type Converter interface {
+	ToModels(ethLog []types.Log) ([]interface{}, error)
+}
+
+type Repository interface {
+	Create(headerID int64, models []interface{}) error
+	MarkHeaderChecked(headerID int64) error
+	MissingHeaders(startingBlockNumber, endingBlockNumber int64) ([]core.Header, error)
+	SetDB(db *postgres.DB)
+}
+
+func (transformer Transformer) NewTransformer(db *postgres.DB, bc core.BlockChain) shared.Transformer {
+	transformer.Repository.SetDB(db)
+	transformer.Fetcher.SetBC(bc)
+	return transformer
+}
+
+func (transformer Transformer) Execute() error {
+	transformerName := transformer.Config.TransformerName
+	missingHeaders, err := transformer.Repository.MissingHeaders(transformer.Config.StartingBlockNumber, transformer.Config.EndingBlockNumber)
+	if err != nil {
+		log.Printf("Error fetching mising headers in %v transformer: %v \n", transformerName, err)
+		return err
+	}
+
+	// Grab event signature from transformer config
+	// (Double-array structure required for go-ethereum FilterQuery)
+	var topic = [][]common.Hash{{common.HexToHash(transformer.Config.Topic)}}
+
+	log.Printf("Fetching %v event logs for %d headers \n", transformerName, len(missingHeaders))
+	for _, header := range missingHeaders {
+		// Fetch the missing logs for a given header
+		matchingLogs, err := transformer.Fetcher.FetchLogs(transformer.Config.ContractAddresses, topic, header.BlockNumber)
+		if err != nil {
+			log.Printf("Error fetching matching logs in %v transformer: %v", transformerName, err)
+			return err
+		}
+
+		// No matching logs, mark the header as checked for this type of logs
+		if len(matchingLogs) < 1 {
+			err := transformer.Repository.MarkHeaderChecked(header.Id)
+			if err != nil {
+				log.Printf("Error marking header as checked in %v: %v", transformerName, err)
+				return err
+			}
+			// Continue with the next header; nothing to persist
+			continue
+		}
+
+		models, err := transformer.Converter.ToModels(matchingLogs)
+		if err != nil {
+			log.Printf("Error converting logs in %v: %v", transformerName, err)
+			return err
+		}
+
+		err = transformer.Repository.Create(header.Id, models)
+		if err != nil {
+			log.Printf("Error persisting %v record: %v", transformerName, err)
+			return err
+		}
+	}
+	return nil
+}

pkg/transformers/integration_tests/drip_file_vow.go

@@ -17,8 +17,9 @@ package integration_tests
 import (
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/factories"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
 
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/drip_file"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/drip_file/vow"
 	"github.com/vulcanize/vulcanizedb/test_config"
 )
@@ -26,7 +27,7 @@ import (
 var _ = Describe("Drip File Vow Transformer", func() {
 	It("transforms DripFileVow log events", func() {
 		blockNumber := int64(8762197)
-		config := drip_file.DripFileConfig
+		config := vow.DripFileVowConfig
 		config.StartingBlockNumber = blockNumber
 		config.EndingBlockNumber = blockNumber
 
@@ -41,8 +42,13 @@ var _ = Describe("Drip File Vow Transformer", func() {
 		err = persistHeader(rpcClient, db, blockNumber)
 		Expect(err).NotTo(HaveOccurred())
 
-		initializer := vow.DripFileVowTransformerInitializer{Config: config}
-		transformer := initializer.NewDripFileVowTransformer(db, blockchain)
+		initializer := factories.Transformer{
+			Config:     config,
+			Fetcher:    &shared.Fetcher{},
+			Converter:  &vow.DripFileVowConverter{},
+			Repository: &vow.DripFileVowRepository{},
+		}
+		transformer := initializer.NewTransformer(db, blockchain)
 		err = transformer.Execute()
 		Expect(err).NotTo(HaveOccurred())
 

pkg/transformers/integration_tests/pit_file_debt_ceiling.go

@@ -17,8 +17,9 @@ package integration_tests
 import (
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/factories"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
 
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/pit_file"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/pit_file/debt_ceiling"
 	"github.com/vulcanize/vulcanizedb/test_config"
 )
@@ -26,7 +27,7 @@ import (
 var _ = Describe("PitFileDebtCeiling Transformer", func() {
 	It("fetches and transforms a PitFileDebtCeiling event from Kovan chain", func() {
 		blockNumber := int64(8535578)
-		config := pit_file.PitFileConfig
+		config := debt_ceiling.DebtCeilingFileConfig
 		config.StartingBlockNumber = blockNumber
 		config.EndingBlockNumber = blockNumber
 
@@ -41,8 +42,13 @@ var _ = Describe("PitFileDebtCeiling Transformer", func() {
 		err = persistHeader(rpcClient, db, blockNumber)
 		Expect(err).NotTo(HaveOccurred())
 
-		initializer := debt_ceiling.PitFileDebtCeilingTransformerInitializer{Config: config}
-		transformer := initializer.NewPitFileDebtCeilingTransformer(db, blockchain)
+		initializer := factories.Transformer{
+			Config:     config,
+			Fetcher:    &shared.Fetcher{},
+			Converter:  &debt_ceiling.PitFileDebtCeilingConverter{},
+			Repository: &debt_ceiling.PitFileDebtCeilingRepository{},
+		}
+		transformer := initializer.NewTransformer(db, blockchain)
 		err = transformer.Execute()
 		Expect(err).NotTo(HaveOccurred())
 

pkg/transformers/integration_tests/pit_file_ilk.go

@@ -17,8 +17,9 @@ package integration_tests
 import (
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/factories"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
 
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/pit_file"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/pit_file/ilk"
 	"github.com/vulcanize/vulcanizedb/test_config"
 )
@@ -26,7 +27,7 @@ import (
 var _ = Describe("PitFileIlk Transformer", func() {
 	It("fetches and transforms a PitFileIlk event from Kovan chain", func() {
 		blockNumber := int64(9103223)
-		config := pit_file.PitFileConfig
+		config := ilk.IlkFileConfig
 		config.StartingBlockNumber = blockNumber
 		config.EndingBlockNumber = blockNumber
 
@@ -41,8 +42,13 @@ var _ = Describe("PitFileIlk Transformer", func() {
 		err = persistHeader(rpcClient, db, blockNumber)
 		Expect(err).NotTo(HaveOccurred())
 
-		initializer := ilk.PitFileIlkTransformerInitializer{Config: config}
-		transformer := initializer.NewPitFileIlkTransformer(db, blockchain)
+		initializer := factories.Transformer{
+			Config:     config,
+			Fetcher:    &shared.Fetcher{},
+			Converter:  &ilk.PitFileIlkConverter{},
+			Repository: &ilk.PitFileIlkRepository{},
+		}
+		transformer := initializer.NewTransformer(db, blockchain)
 		err = transformer.Execute()
 		Expect(err).NotTo(HaveOccurred())
 

pkg/transformers/integration_tests/pit_file_stability_fee.go

@@ -17,8 +17,9 @@ package integration_tests
 import (
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/factories"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
 
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/pit_file"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/pit_file/stability_fee"
 	"github.com/vulcanize/vulcanizedb/test_config"
 )
@@ -26,7 +27,7 @@ import (
 var _ = Describe("PitFileStabilityFee Transformer", func() {
 	It("fetches and transforms a PitFileStabilityFee event from Kovan chain", func() {
 		blockNumber := int64(8535544)
-		config := pit_file.PitFileConfig
+		config := stability_fee.StabilityFeeFileConfig
 		config.StartingBlockNumber = blockNumber
 		config.EndingBlockNumber = blockNumber
 
@@ -41,8 +42,13 @@ var _ = Describe("PitFileStabilityFee Transformer", func() {
 		err = persistHeader(rpcClient, db, blockNumber)
 		Expect(err).NotTo(HaveOccurred())
 
-		initializer := stability_fee.PitFileStabilityFeeTransformerInitializer{Config: config}
-		transformer := initializer.NewPitFileStabilityFeeTransformer(db, blockchain)
+		initializer := factories.Transformer{
+			Config:     config,
+			Fetcher:    &shared.Fetcher{},
+			Converter:  &stability_fee.PitFileStabilityFeeConverter{},
+			Repository: &stability_fee.PitFileStabilityFeeRepository{},
+		}
+		transformer := initializer.NewTransformer(db, blockchain)
 		err = transformer.Execute()
 		Expect(err).NotTo(HaveOccurred())
 

pkg/transformers/integration_tests/tend.go

@@ -17,6 +17,8 @@ package integration_tests
 import (
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/factories"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
 
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/tend"
 	"github.com/vulcanize/vulcanizedb/test_config"
@@ -40,8 +42,13 @@ var _ = Describe("Tend Transformer", func() {
 		err = persistHeader(rpcClient, db, blockNumber)
 		Expect(err).NotTo(HaveOccurred())
 
-		initializer := tend.TendTransformerInitializer{Config: config}
-		transformer := initializer.NewTendTransformer(db, blockchain)
+		initializer := factories.Transformer{
+			Config:     config,
+			Fetcher:    &shared.Fetcher{},
+			Converter:  &tend.TendConverter{},
+			Repository: &tend.TendRepository{},
+		}
+		transformer := initializer.NewTransformer(db, blockchain)
 		err = transformer.Execute()
 		Expect(err).NotTo(HaveOccurred())
 
@@ -74,8 +81,13 @@ var _ = Describe("Tend Transformer", func() {
 		err = persistHeader(rpcClient, db, blockNumber)
 		Expect(err).NotTo(HaveOccurred())
 
-		initializer := tend.TendTransformerInitializer{Config: config}
-		transformer := initializer.NewTendTransformer(db, blockchain)
+		initializer := factories.Transformer{
+			Config:     config,
+			Fetcher:    &shared.Fetcher{},
+			Converter:  &tend.TendConverter{},
+			Repository: &tend.TendRepository{},
+		}
+		transformer := initializer.NewTransformer(db, blockchain)
 		err = transformer.Execute()
 		Expect(err).NotTo(HaveOccurred())
 

pkg/transformers/integration_tests/vat_init.go

@@ -17,6 +17,8 @@ package integration_tests
 import (
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/factories"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
 
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/vat_init"
 	"github.com/vulcanize/vulcanizedb/test_config"
@@ -40,8 +42,13 @@ var _ = Describe("VatInit Transformer", func() {
 		err = persistHeader(rpcClient, db, blockNumber)
 		Expect(err).NotTo(HaveOccurred())
 
-		initializer := vat_init.VatInitTransformerInitializer{Config: config}
-		transformer := initializer.NewVatInitTransformer(db, blockchain)
+		initializer := factories.Transformer{
+			Config:     config,
+			Fetcher:    &shared.Fetcher{},
+			Converter:  &vat_init.VatInitConverter{},
+			Repository: &vat_init.VatInitRepository{},
+		}
+		transformer := initializer.NewTransformer(db, blockchain)
 		err = transformer.Execute()
 		Expect(err).NotTo(HaveOccurred())
 

pkg/transformers/integration_tests/vat_move.go

@@ -18,6 +18,8 @@ import (
 	"github.com/ethereum/go-ethereum/common"
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/factories"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
 
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/vat_move"
 	"github.com/vulcanize/vulcanizedb/test_config"
@@ -41,8 +43,13 @@ var _ = Describe("VatMove Transformer", func() {
 		err = persistHeader(rpcClient, db, blockNumber)
 		Expect(err).NotTo(HaveOccurred())
 
-		initializer := vat_move.VatMoveTransformerInitializer{Config: config}
-		transformer := initializer.NewVatMoveTransformer(db, blockchain)
+		initializer := factories.Transformer{
+			Config:     config,
+			Fetcher:    &shared.Fetcher{},
+			Converter:  &vat_move.VatMoveConverter{},
+			Repository: &vat_move.VatMoveRepository{},
+		}
+		transformer := initializer.NewTransformer(db, blockchain)
 		err = transformer.Execute()
 		Expect(err).NotTo(HaveOccurred())
 

pkg/transformers/pit_file/debt_ceiling/config.go

@@ -12,16 +12,17 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package pit_file
+package debt_ceiling
 
 import (
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
 )
 
-var PitFileConfig = shared.TransformerConfig{
+var DebtCeilingFileConfig = shared.SingleTransformerConfig{
+	TransformerName:     shared.PitFileDebtCeilingLabel,
 	ContractAddresses:   []string{shared.PitContractAddress},
 	ContractAbi:         shared.PitABI,
-	Topics:              []string{shared.PitFileIlkSignature, shared.PitFileDebtCeilingSignature, shared.PitFileStabilityFeeSignature},
+	Topic:               shared.PitFileDebtCeilingSignature,
 	StartingBlockNumber: 0,
 	EndingBlockNumber:   10000000,
 }

pkg/transformers/pit_file/debt_ceiling/converter.go

@@ -24,14 +24,10 @@ import (
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
 )
 
-type Converter interface {
-	ToModels(ethLogs []types.Log) ([]PitFileDebtCeilingModel, error)
-}
-
 type PitFileDebtCeilingConverter struct{}
 
-func (PitFileDebtCeilingConverter) ToModels(ethLogs []types.Log) ([]PitFileDebtCeilingModel, error) {
-	var models []PitFileDebtCeilingModel
+func (PitFileDebtCeilingConverter) ToModels(ethLogs []types.Log) ([]interface{}, error) {
+	var models []interface{}
 	for _, ethLog := range ethLogs {
 		err := verifyLog(ethLog)
 		if err != nil {

pkg/transformers/pit_file/debt_ceiling/converter_test.go

@@ -17,10 +17,10 @@ package debt_ceiling_test
 import (
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/pit_file/debt_ceiling"
 
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core/types"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/pit_file/debt_ceiling"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/test_data"
 )
 
@@ -54,6 +54,6 @@ var _ = Describe("Pit file debt ceiling converter", func() {
 
 		Expect(err).NotTo(HaveOccurred())
 		Expect(len(models)).To(Equal(1))
-		Expect(models[0]).To(Equal(test_data.PitFileDebtCeilingModel))
+		Expect(models[0].(debt_ceiling.PitFileDebtCeilingModel)).To(Equal(test_data.PitFileDebtCeilingModel))
 	})
 })

pkg/transformers/pit_file/debt_ceiling/repository.go

@@ -15,58 +15,58 @@
 package debt_ceiling
 
 import (
+	"fmt"
 	"github.com/vulcanize/vulcanizedb/pkg/core"
 	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
 )
 
-type Repository interface {
-	Create(headerID int64, models []PitFileDebtCeilingModel) error
-	MarkHeaderChecked(headerID int64) error
-	MissingHeaders(startingBlockNumber, endingBlockNumber int64) ([]core.Header, error)
-}
-
 type PitFileDebtCeilingRepository struct {
 	db *postgres.DB
 }
 
-func NewPitFileDebtCeilingRepository(db *postgres.DB) PitFileDebtCeilingRepository {
-	return PitFileDebtCeilingRepository{
-		db: db,
-	}
-}
-
-func (repository PitFileDebtCeilingRepository) Create(headerID int64, models []PitFileDebtCeilingModel) error {
+func (repository PitFileDebtCeilingRepository) Create(headerID int64, models []interface{}) error {
 	tx, err := repository.db.Begin()
 	if err != nil {
 		return err
 	}
+
 	for _, model := range models {
+		pitFileDC, ok := model.(PitFileDebtCeilingModel)
+		if !ok {
+			tx.Rollback()
+			return fmt.Errorf("model of type %T, not %T", model, PitFileDebtCeilingModel{})
+		}
+
 		_, err = tx.Exec(
 			`INSERT into maker.pit_file_debt_ceiling (header_id, what, data, tx_idx, raw_log)
         VALUES($1, $2, $3::NUMERIC, $4, $5)`,
-			headerID, model.What, model.Data, model.TransactionIndex, model.Raw,
+			headerID, pitFileDC.What, pitFileDC.Data, pitFileDC.TransactionIndex, pitFileDC.Raw,
 		)
+
 		if err != nil {
 			tx.Rollback()
 			return err
 		}
 	}
+
 	_, err = tx.Exec(`INSERT INTO public.checked_headers (header_id, pit_file_debt_ceiling_checked)
 		VALUES ($1, $2) 
-	ON CONFLICT (header_id) DO
-		UPDATE SET pit_file_debt_ceiling_checked = $2`, headerID, true)
+		ON CONFLICT (header_id) DO
+			UPDATE SET pit_file_debt_ceiling_checked = $2`, headerID, true)
+
 	if err != nil {
 		tx.Rollback()
 		return err
 	}
+
 	return tx.Commit()
 }
 
 func (repository PitFileDebtCeilingRepository) MarkHeaderChecked(headerID int64) error {
 	_, err := repository.db.Exec(`INSERT INTO public.checked_headers (header_id, pit_file_debt_ceiling_checked)
 		VALUES ($1, $2) 
-	ON CONFLICT (header_id) DO
-		UPDATE SET pit_file_debt_ceiling_checked = $2`, headerID, true)
+		ON CONFLICT (header_id) DO
+			UPDATE SET pit_file_debt_ceiling_checked = $2`, headerID, true)
 	return err
 }
 
@@ -75,14 +75,18 @@ func (repository PitFileDebtCeilingRepository) MissingHeaders(startingBlockNumbe
 	err := repository.db.Select(
 		&result,
 		`SELECT headers.id, headers.block_number FROM headers
-               LEFT JOIN checked_headers on headers.id = header_id
+               	LEFT JOIN checked_headers on headers.id = header_id
                WHERE (header_id ISNULL OR pit_file_debt_ceiling_checked IS FALSE)
-               AND headers.block_number >= $1
-               AND headers.block_number <= $2
-               AND headers.eth_node_fingerprint = $3`,
+               	AND headers.block_number >= $1
+               	AND headers.block_number <= $2
+               	AND headers.eth_node_fingerprint = $3`,
 		startingBlockNumber,
 		endingBlockNumber,
 		repository.db.Node.ID,
 	)
 	return result, err
 }
+
+func (repository *PitFileDebtCeilingRepository) SetDB(db *postgres.DB) {
+	repository.db = db
+}

pkg/transformers/pit_file/debt_ceiling/repository_test.go

@@ -16,6 +16,7 @@ package debt_ceiling_test
 
 import (
 	"database/sql"
+	"math/rand"
 
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
@@ -32,17 +33,18 @@ import (
 
 var _ = Describe("Pit file debt ceiling repository", func() {
 	var (
-		db                *postgres.DB
-		pitFileRepository debt_ceiling.Repository
-		err               error
-		headerRepository  datastore.HeaderRepository
+		db                           *postgres.DB
+		pitFileDebtCeilingRepository debt_ceiling.PitFileDebtCeilingRepository
+		err                          error
+		headerRepository             datastore.HeaderRepository
 	)
 
 	BeforeEach(func() {
 		db = test_config.NewTestDB(core.Node{})
 		test_config.CleanTestDB(db)
 		headerRepository = repositories.NewHeaderRepository(db)
-		pitFileRepository = debt_ceiling.NewPitFileDebtCeilingRepository(db)
+		pitFileDebtCeilingRepository = debt_ceiling.PitFileDebtCeilingRepository{}
+		pitFileDebtCeilingRepository.SetDB(db)
 	})
 
 	Describe("Create", func() {
@@ -52,7 +54,7 @@ var _ = Describe("Pit file debt ceiling repository", func() {
 			headerID, err = headerRepository.CreateOrUpdateHeader(fakes.FakeHeader)
 			Expect(err).NotTo(HaveOccurred())
 
-			err = pitFileRepository.Create(headerID, []debt_ceiling.PitFileDebtCeilingModel{test_data.PitFileDebtCeilingModel})
+			err = pitFileDebtCeilingRepository.Create(headerID, []interface{}{test_data.PitFileDebtCeilingModel})
 			Expect(err).NotTo(HaveOccurred())
 		})
 
@@ -74,7 +76,7 @@ var _ = Describe("Pit file debt ceiling repository", func() {
 		})
 
 		It("does not duplicate pit file events", func() {
-			err = pitFileRepository.Create(headerID, []debt_ceiling.PitFileDebtCeilingModel{test_data.PitFileDebtCeilingModel})
+			err = pitFileDebtCeilingRepository.Create(headerID, []interface{}{test_data.PitFileDebtCeilingModel})
 
 			Expect(err).To(HaveOccurred())
 			Expect(err.Error()).To(ContainSubstring("pq: duplicate key value violates unique constraint"))
@@ -89,6 +91,12 @@ var _ = Describe("Pit file debt ceiling repository", func() {
 			Expect(err).To(HaveOccurred())
 			Expect(err).To(MatchError(sql.ErrNoRows))
 		})
+
+		It("Returns an error if model is of wrong type", func() {
+			err = pitFileDebtCeilingRepository.Create(headerID, []interface{}{test_data.WrongModel{}})
+			Expect(err).To(HaveOccurred())
+			Expect(err.Error()).To(ContainSubstring("model of type"))
+		})
 	})
 
 	Describe("MarkHeaderChecked", func() {
@@ -100,7 +108,7 @@ var _ = Describe("Pit file debt ceiling repository", func() {
 		})
 
 		It("creates a row for a new headerID", func() {
-			err = pitFileRepository.MarkHeaderChecked(headerID)
+			err = pitFileDebtCeilingRepository.MarkHeaderChecked(headerID)
 
 			Expect(err).NotTo(HaveOccurred())
 			var headerChecked bool
@@ -112,7 +120,7 @@ var _ = Describe("Pit file debt ceiling repository", func() {
 		It("updates row when headerID already exists", func() {
 			_, err = db.Exec(`INSERT INTO public.checked_headers (header_id) VALUES ($1)`, headerID)
 
-			err = pitFileRepository.MarkHeaderChecked(headerID)
+			err = pitFileDebtCeilingRepository.MarkHeaderChecked(headerID)
 
 			Expect(err).NotTo(HaveOccurred())
 			var headerChecked bool
@@ -129,7 +137,7 @@ var _ = Describe("Pit file debt ceiling repository", func() {
 		)
 
 		BeforeEach(func() {
-			startingBlock = GinkgoRandomSeed()
+			startingBlock = rand.Int63()
 			pitFileBlock = startingBlock + 1
 			endingBlock = startingBlock + 2
 
@@ -144,10 +152,11 @@ var _ = Describe("Pit file debt ceiling repository", func() {
 		})
 
 		It("returns headers that haven't been checked", func() {
-			err := pitFileRepository.MarkHeaderChecked(headerIDs[1])
+
+			err := pitFileDebtCeilingRepository.MarkHeaderChecked(headerIDs[1])
 			Expect(err).NotTo(HaveOccurred())
 
-			headers, err := pitFileRepository.MissingHeaders(startingBlock, endingBlock)
+			headers, err := pitFileDebtCeilingRepository.MissingHeaders(startingBlock, endingBlock)
 
 			Expect(err).NotTo(HaveOccurred())
 			Expect(len(headers)).To(Equal(2))
@@ -159,7 +168,7 @@ var _ = Describe("Pit file debt ceiling repository", func() {
 			_, err := db.Exec(`INSERT INTO public.checked_headers (header_id) VALUES ($1)`, headerIDs[1])
 			Expect(err).NotTo(HaveOccurred())
 
-			headers, err := pitFileRepository.MissingHeaders(startingBlock, endingBlock)
+			headers, err := pitFileDebtCeilingRepository.MissingHeaders(startingBlock, endingBlock)
 
 			Expect(err).NotTo(HaveOccurred())
 			Expect(len(headers)).To(Equal(3))
@@ -175,16 +184,16 @@ var _ = Describe("Pit file debt ceiling repository", func() {
 				_, err = headerRepositoryTwo.CreateOrUpdateHeader(fakes.GetFakeHeader(n))
 				Expect(err).NotTo(HaveOccurred())
 			}
-			pitFileRepository := debt_ceiling.NewPitFileDebtCeilingRepository(db)
-			pitFileRepositoryTwo := debt_ceiling.NewPitFileDebtCeilingRepository(dbTwo)
-			err := pitFileRepository.MarkHeaderChecked(headerIDs[0])
+			pitFileDebtCeilingRepositoryTwo := debt_ceiling.PitFileDebtCeilingRepository{}
+			pitFileDebtCeilingRepositoryTwo.SetDB(dbTwo)
+			err := pitFileDebtCeilingRepository.MarkHeaderChecked(headerIDs[0])
 			Expect(err).NotTo(HaveOccurred())
 
-			nodeOneMissingHeaders, err := pitFileRepository.MissingHeaders(blockNumbers[0], blockNumbers[len(blockNumbers)-1])
+			nodeOneMissingHeaders, err := pitFileDebtCeilingRepository.MissingHeaders(blockNumbers[0], blockNumbers[len(blockNumbers)-1])
 			Expect(err).NotTo(HaveOccurred())
 			Expect(len(nodeOneMissingHeaders)).To(Equal(len(blockNumbers) - 1))
 
-			nodeTwoMissingHeaders, err := pitFileRepositoryTwo.MissingHeaders(blockNumbers[0], blockNumbers[len(blockNumbers)-1])
+			nodeTwoMissingHeaders, err := pitFileDebtCeilingRepositoryTwo.MissingHeaders(blockNumbers[0], blockNumbers[len(blockNumbers)-1])
 			Expect(err).NotTo(HaveOccurred())
 			Expect(len(nodeTwoMissingHeaders)).To(Equal(len(blockNumbers)))
 		})

pkg/transformers/pit_file/debt_ceiling/transformer.go

@@ -1,79 +0,0 @@
-// Copyright 2018 Vulcanize
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package debt_ceiling
-
-import (
-	"log"
-
-	"github.com/ethereum/go-ethereum/common"
-
-	"github.com/vulcanize/vulcanizedb/pkg/core"
-	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/pit_file"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
-)
-
-type PitFileDebtCeilingTransformer struct {
-	Config     shared.TransformerConfig
-	Converter  Converter
-	Fetcher    shared.LogFetcher
-	Repository Repository
-}
-
-type PitFileDebtCeilingTransformerInitializer struct {
-	Config shared.TransformerConfig
-}
-
-func (initializer PitFileDebtCeilingTransformerInitializer) NewPitFileDebtCeilingTransformer(db *postgres.DB, blockChain core.BlockChain) shared.Transformer {
-	converter := PitFileDebtCeilingConverter{}
-	fetcher := shared.NewFetcher(blockChain)
-	repository := NewPitFileDebtCeilingRepository(db)
-	return PitFileDebtCeilingTransformer{
-		Config:     initializer.Config,
-		Converter:  converter,
-		Fetcher:    fetcher,
-		Repository: repository,
-	}
-}
-
-func (transformer PitFileDebtCeilingTransformer) Execute() error {
-	missingHeaders, err := transformer.Repository.MissingHeaders(transformer.Config.StartingBlockNumber, transformer.Config.EndingBlockNumber)
-	if err != nil {
-		return err
-	}
-	log.Printf("Fetching pit file debt ceiling event logs for %d headers \n", len(missingHeaders))
-	for _, header := range missingHeaders {
-		topics := [][]common.Hash{{common.HexToHash(shared.PitFileDebtCeilingSignature)}}
-		matchingLogs, err := transformer.Fetcher.FetchLogs(pit_file.PitFileConfig.ContractAddresses, topics, header.BlockNumber)
-		if err != nil {
-			return err
-		}
-		if len(matchingLogs) < 1 {
-			err = transformer.Repository.MarkHeaderChecked(header.Id)
-			if err != nil {
-				return err
-			}
-		}
-		model, err := transformer.Converter.ToModels(matchingLogs)
-		if err != nil {
-			return err
-		}
-		err = transformer.Repository.Create(header.Id, model)
-		if err != nil {
-			return err
-		}
-	}
-	return nil
-}

pkg/transformers/pit_file/debt_ceiling/transformer_test.go

@@ -19,10 +19,11 @@ import (
 	"github.com/ethereum/go-ethereum/core/types"
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/factories"
+	"math/rand"
 
 	"github.com/vulcanize/vulcanizedb/pkg/core"
 	"github.com/vulcanize/vulcanizedb/pkg/fakes"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/pit_file"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/pit_file/debt_ceiling"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/test_data"
@@ -31,31 +32,45 @@ import (
 )
 
 var _ = Describe("Pit file debt ceiling transformer", func() {
-	It("gets missing headers for block numbers specified in config", func() {
-		repository := &debt_ceiling_mocks.MockPitFileDebtCeilingRepository{}
-		transformer := debt_ceiling.PitFileDebtCeilingTransformer{
-			Config:     pit_file.PitFileConfig,
-			Fetcher:    &mocks.MockLogFetcher{},
-			Converter:  &debt_ceiling_mocks.MockPitFileDebtCeilingConverter{},
-			Repository: repository,
-		}
+	var (
+		config      = debt_ceiling.DebtCeilingFileConfig
+		fetcher     mocks.MockLogFetcher
+		converter   debt_ceiling_mocks.MockPitFileDebtCeilingConverter
+		repository  debt_ceiling_mocks.MockPitFileDebtCeilingRepository
+		transformer shared.Transformer
+		headerOne   core.Header
+		headerTwo   core.Header
+	)
 
+	BeforeEach(func() {
+		fetcher = mocks.MockLogFetcher{}
+		converter = debt_ceiling_mocks.MockPitFileDebtCeilingConverter{}
+		repository = debt_ceiling_mocks.MockPitFileDebtCeilingRepository{}
+		headerOne = core.Header{Id: rand.Int63(), BlockNumber: rand.Int63()}
+		headerTwo = core.Header{Id: rand.Int63(), BlockNumber: rand.Int63()}
+		transformer = factories.Transformer{
+			Config:     config,
+			Fetcher:    &fetcher,
+			Converter:  &converter,
+			Repository: &repository,
+		}.NewTransformer(nil, nil)
+	})
+
+	It("sets the blockchain and database", func() {
+		Expect(fetcher.SetBcCalled).To(BeTrue())
+		Expect(repository.SetDbCalled).To(BeTrue())
+	})
+
+	It("gets missing headers for block numbers specified in config", func() {
 		err := transformer.Execute()
 
 		Expect(err).NotTo(HaveOccurred())
-		Expect(repository.PassedStartingBlockNumber).To(Equal(pit_file.PitFileConfig.StartingBlockNumber))
-		Expect(repository.PassedEndingBlockNumber).To(Equal(pit_file.PitFileConfig.EndingBlockNumber))
+		Expect(repository.PassedStartingBlockNumber).To(Equal(config.StartingBlockNumber))
+		Expect(repository.PassedEndingBlockNumber).To(Equal(config.EndingBlockNumber))
 	})
 
 	It("returns error if repository returns error for missing headers", func() {
-		repository := &debt_ceiling_mocks.MockPitFileDebtCeilingRepository{}
-		repository.SetMissingHeadersErr(fakes.FakeError)
-		transformer := debt_ceiling.PitFileDebtCeilingTransformer{
-			Fetcher:    &mocks.MockLogFetcher{},
-			Converter:  &debt_ceiling_mocks.MockPitFileDebtCeilingConverter{},
-			Repository: repository,
-		}
-
+		repository.SetMissingHeadersError(fakes.FakeError)
 		err := transformer.Execute()
 
 		Expect(err).To(HaveOccurred())
@@ -63,34 +78,18 @@ var _ = Describe("Pit file debt ceiling transformer", func() {
 	})
 
 	It("fetches logs for missing headers", func() {
-		fetcher := &mocks.MockLogFetcher{}
-		repository := &debt_ceiling_mocks.MockPitFileDebtCeilingRepository{}
-		repository.SetMissingHeaders([]core.Header{{BlockNumber: 1}, {BlockNumber: 2}})
-		transformer := debt_ceiling.PitFileDebtCeilingTransformer{
-			Fetcher:    fetcher,
-			Converter:  &debt_ceiling_mocks.MockPitFileDebtCeilingConverter{},
-			Repository: repository,
-		}
-
+		repository.SetMissingHeaders([]core.Header{headerOne, headerTwo})
 		err := transformer.Execute()
 
 		Expect(err).NotTo(HaveOccurred())
-		Expect(fetcher.FetchedBlocks).To(Equal([]int64{1, 2}))
-		Expect(fetcher.FetchedContractAddresses).To(Equal([][]string{pit_file.PitFileConfig.ContractAddresses, pit_file.PitFileConfig.ContractAddresses}))
+		Expect(fetcher.FetchedBlocks).To(Equal([]int64{headerOne.BlockNumber, headerTwo.BlockNumber}))
+		Expect(fetcher.FetchedContractAddresses).To(Equal([][]string{config.ContractAddresses, config.ContractAddresses}))
 		Expect(fetcher.FetchedTopics).To(Equal([][]common.Hash{{common.HexToHash(shared.PitFileDebtCeilingSignature)}}))
 	})
 
 	It("returns error if fetcher returns error", func() {
-		fetcher := &mocks.MockLogFetcher{}
 		fetcher.SetFetcherError(fakes.FakeError)
-		repository := &debt_ceiling_mocks.MockPitFileDebtCeilingRepository{}
-		repository.SetMissingHeaders([]core.Header{{BlockNumber: 1}})
-		transformer := debt_ceiling.PitFileDebtCeilingTransformer{
-			Fetcher:    fetcher,
-			Converter:  &debt_ceiling_mocks.MockPitFileDebtCeilingConverter{},
-			Repository: repository,
-		}
-
+		repository.SetMissingHeaders([]core.Header{headerOne})
 		err := transformer.Execute()
 
 		Expect(err).To(HaveOccurred())
@@ -98,34 +97,17 @@ var _ = Describe("Pit file debt ceiling transformer", func() {
 	})
 
 	It("marks header checked if no logs returned", func() {
-		mockConverter := &debt_ceiling_mocks.MockPitFileDebtCeilingConverter{}
-		mockRepository := &debt_ceiling_mocks.MockPitFileDebtCeilingRepository{}
-		headerID := int64(123)
-		mockRepository.SetMissingHeaders([]core.Header{{Id: headerID}})
-		mockFetcher := &mocks.MockLogFetcher{}
-		transformer := debt_ceiling.PitFileDebtCeilingTransformer{
-			Converter:  mockConverter,
-			Fetcher:    mockFetcher,
-			Repository: mockRepository,
-		}
+		repository.SetMissingHeaders([]core.Header{headerOne})
 
 		err := transformer.Execute()
 
 		Expect(err).NotTo(HaveOccurred())
-		mockRepository.AssertMarkHeaderCheckedCalledWith(headerID)
+		repository.AssertMarkHeaderCheckedCalledWith(headerOne.Id)
 	})
 
 	It("returns error if marking header checked returns err", func() {
-		mockConverter := &debt_ceiling_mocks.MockPitFileDebtCeilingConverter{}
-		mockRepository := &debt_ceiling_mocks.MockPitFileDebtCeilingRepository{}
-		mockRepository.SetMissingHeaders([]core.Header{{Id: int64(123)}})
-		mockRepository.SetMarkHeaderCheckedErr(fakes.FakeError)
-		mockFetcher := &mocks.MockLogFetcher{}
-		transformer := debt_ceiling.PitFileDebtCeilingTransformer{
-			Converter:  mockConverter,
-			Fetcher:    mockFetcher,
-			Repository: mockRepository,
-		}
+		repository.SetMissingHeaders([]core.Header{headerOne})
+		repository.SetMarkHeaderCheckedError(fakes.FakeError)
 
 		err := transformer.Execute()
 
@@ -134,16 +116,8 @@ var _ = Describe("Pit file debt ceiling transformer", func() {
 	})
 
 	It("converts matching logs", func() {
-		converter := &debt_ceiling_mocks.MockPitFileDebtCeilingConverter{}
-		fetcher := &mocks.MockLogFetcher{}
 		fetcher.SetFetchedLogs([]types.Log{test_data.EthPitFileDebtCeilingLog})
-		repository := &debt_ceiling_mocks.MockPitFileDebtCeilingRepository{}
-		repository.SetMissingHeaders([]core.Header{{BlockNumber: 1}})
-		transformer := debt_ceiling.PitFileDebtCeilingTransformer{
-			Fetcher:    fetcher,
-			Converter:  converter,
-			Repository: repository,
-		}
+		repository.SetMissingHeaders([]core.Header{headerOne})
 
 		err := transformer.Execute()
 
@@ -152,17 +126,9 @@ var _ = Describe("Pit file debt ceiling transformer", func() {
 	})
 
 	It("returns error if converter returns error", func() {
-		converter := &debt_ceiling_mocks.MockPitFileDebtCeilingConverter{}
 		converter.SetConverterError(fakes.FakeError)
-		fetcher := &mocks.MockLogFetcher{}
 		fetcher.SetFetchedLogs([]types.Log{test_data.EthPitFileDebtCeilingLog})
-		repository := &debt_ceiling_mocks.MockPitFileDebtCeilingRepository{}
-		repository.SetMissingHeaders([]core.Header{{BlockNumber: 1}})
-		transformer := debt_ceiling.PitFileDebtCeilingTransformer{
-			Fetcher:    fetcher,
-			Converter:  converter,
-			Repository: repository,
-		}
+		repository.SetMissingHeaders([]core.Header{headerOne})
 
 		err := transformer.Execute()
 
@@ -171,37 +137,20 @@ var _ = Describe("Pit file debt ceiling transformer", func() {
 	})
 
 	It("persists pit file model", func() {
-		converter := &debt_ceiling_mocks.MockPitFileDebtCeilingConverter{}
-		fetcher := &mocks.MockLogFetcher{}
 		fetcher.SetFetchedLogs([]types.Log{test_data.EthPitFileDebtCeilingLog})
-		repository := &debt_ceiling_mocks.MockPitFileDebtCeilingRepository{}
-		fakeHeader := core.Header{BlockNumber: 1, Id: 2}
-		repository.SetMissingHeaders([]core.Header{fakeHeader})
-		transformer := debt_ceiling.PitFileDebtCeilingTransformer{
-			Fetcher:    fetcher,
-			Converter:  converter,
-			Repository: repository,
-		}
+		repository.SetMissingHeaders([]core.Header{headerOne})
 
 		err := transformer.Execute()
 
 		Expect(err).NotTo(HaveOccurred())
-		Expect(repository.PassedHeaderID).To(Equal(fakeHeader.Id))
-		Expect(repository.PassedModels).To(Equal([]debt_ceiling.PitFileDebtCeilingModel{test_data.PitFileDebtCeilingModel}))
+		Expect(repository.PassedHeaderID).To(Equal(headerOne.Id))
+		Expect(repository.PassedModels).To(Equal([]interface{}{test_data.PitFileDebtCeilingModel}))
 	})
 
 	It("returns error if repository returns error for create", func() {
-		converter := &debt_ceiling_mocks.MockPitFileDebtCeilingConverter{}
-		fetcher := &mocks.MockLogFetcher{}
 		fetcher.SetFetchedLogs([]types.Log{test_data.EthPitFileDebtCeilingLog})
-		repository := &debt_ceiling_mocks.MockPitFileDebtCeilingRepository{}
-		repository.SetMissingHeaders([]core.Header{{BlockNumber: 1, Id: 2}})
+		repository.SetMissingHeaders([]core.Header{headerOne})
 		repository.SetCreateError(fakes.FakeError)
-		transformer := debt_ceiling.PitFileDebtCeilingTransformer{
-			Fetcher:    fetcher,
-			Converter:  converter,
-			Repository: repository,
-		}
 
 		err := transformer.Execute()
 

pkg/transformers/pit_file/ilk/config.go

@@ -0,0 +1,28 @@
+// Copyright 2018 Vulcanize
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package ilk
+
+import (
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
+)
+
+var IlkFileConfig = shared.SingleTransformerConfig{
+	TransformerName:     shared.PitFileIlkLabel,
+	ContractAddresses:   []string{shared.PitContractAddress},
+	ContractAbi:         shared.PitABI,
+	Topic:               shared.PitFileIlkSignature,
+	StartingBlockNumber: 0,
+	EndingBlockNumber:   10000000,
+}

pkg/transformers/pit_file/ilk/converter.go

@@ -24,14 +24,10 @@ import (
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
 )
 
-type Converter interface {
-	ToModels(ethLogs []types.Log) ([]PitFileIlkModel, error)
-}
-
 type PitFileIlkConverter struct{}
 
-func (PitFileIlkConverter) ToModels(ethLogs []types.Log) ([]PitFileIlkModel, error) {
-	var models []PitFileIlkModel
+func (PitFileIlkConverter) ToModels(ethLogs []types.Log) ([]interface{}, error) {
+	var models []interface{}
 	for _, ethLog := range ethLogs {
 		err := verifyLog(ethLog)
 		if err != nil {

pkg/transformers/pit_file/ilk/converter_test.go

@@ -54,6 +54,6 @@ var _ = Describe("Pit file ilk converter", func() {
 
 		Expect(err).NotTo(HaveOccurred())
 		Expect(len(models)).To(Equal(1))
-		Expect(models[0]).To(Equal(test_data.PitFileIlkModel))
+		Expect(models[0].(ilk.PitFileIlkModel)).To(Equal(test_data.PitFileIlkModel))
 	})
 })

pkg/transformers/pit_file/ilk/repository.go

@@ -15,36 +15,32 @@
 package ilk
 
 import (
+	"fmt"
 	"github.com/vulcanize/vulcanizedb/pkg/core"
 	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
 )
 
-type Repository interface {
-	Create(headerID int64, models []PitFileIlkModel) error
-	MarkHeaderChecked(headerID int64) error
-	MissingHeaders(startingBlockNumber, endingBlockNumber int64) ([]core.Header, error)
-}
-
 type PitFileIlkRepository struct {
 	db *postgres.DB
 }
 
-func NewPitFileIlkRepository(db *postgres.DB) PitFileIlkRepository {
-	return PitFileIlkRepository{
-		db: db,
-	}
-}
-
-func (repository PitFileIlkRepository) Create(headerID int64, models []PitFileIlkModel) error {
+func (repository PitFileIlkRepository) Create(headerID int64, models []interface{}) error {
 	tx, err := repository.db.Begin()
 	if err != nil {
 		return err
 	}
+
 	for _, model := range models {
+		pitFileIlk, ok := model.(PitFileIlkModel)
+		if !ok {
+			tx.Rollback()
+			return fmt.Errorf("model of type %T, not %T", model, PitFileIlkModel{})
+		}
+
 		_, err = tx.Exec(
 			`INSERT into maker.pit_file_ilk (header_id, ilk, what, data, tx_idx, raw_log)
         VALUES($1, $2, $3, $4::NUMERIC, $5, $6)`,
-			headerID, model.Ilk, model.What, model.Data, model.TransactionIndex, model.Raw,
+			headerID, pitFileIlk.Ilk, pitFileIlk.What, pitFileIlk.Data, pitFileIlk.TransactionIndex, pitFileIlk.Raw,
 		)
 		if err != nil {
 			tx.Rollback()
@@ -75,14 +71,18 @@ func (repository PitFileIlkRepository) MissingHeaders(startingBlockNumber, endin
 	err := repository.db.Select(
 		&result,
 		`SELECT headers.id, headers.block_number FROM headers
-               LEFT JOIN checked_headers on headers.id = header_id
+                 LEFT JOIN checked_headers on headers.id = header_id
                WHERE (header_id ISNULL OR pit_file_ilk_checked IS FALSE)
-               AND headers.block_number >= $1
-               AND headers.block_number <= $2
-               AND headers.eth_node_fingerprint = $3`,
+                 AND headers.block_number >= $1
+                 AND headers.block_number <= $2
+                 AND headers.eth_node_fingerprint = $3`,
 		startingBlockNumber,
 		endingBlockNumber,
 		repository.db.Node.ID,
 	)
 	return result, err
 }
+
+func (repository *PitFileIlkRepository) SetDB(db *postgres.DB) {
+	repository.db = db
+}

pkg/transformers/pit_file/ilk/repository_test.go

@@ -16,6 +16,7 @@ package ilk_test
 
 import (
 	"database/sql"
+	"math/rand"
 
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
@@ -33,7 +34,7 @@ import (
 var _ = Describe("Pit file ilk repository", func() {
 	var (
 		db                *postgres.DB
-		pitFileRepository ilk.Repository
+		pitFileRepository ilk.PitFileIlkRepository
 		err               error
 		headerRepository  datastore.HeaderRepository
 	)
@@ -42,7 +43,8 @@ var _ = Describe("Pit file ilk repository", func() {
 		db = test_config.NewTestDB(core.Node{})
 		test_config.CleanTestDB(db)
 		headerRepository = repositories.NewHeaderRepository(db)
-		pitFileRepository = ilk.NewPitFileIlkRepository(db)
+		pitFileRepository = ilk.PitFileIlkRepository{}
+		pitFileRepository.SetDB(db)
 	})
 
 	Describe("Create", func() {
@@ -52,7 +54,7 @@ var _ = Describe("Pit file ilk repository", func() {
 			headerID, err = headerRepository.CreateOrUpdateHeader(fakes.FakeHeader)
 			Expect(err).NotTo(HaveOccurred())
 
-			err = pitFileRepository.Create(headerID, []ilk.PitFileIlkModel{test_data.PitFileIlkModel})
+			err = pitFileRepository.Create(headerID, []interface{}{test_data.PitFileIlkModel})
 			Expect(err).NotTo(HaveOccurred())
 		})
 
@@ -75,7 +77,7 @@ var _ = Describe("Pit file ilk repository", func() {
 		})
 
 		It("does not duplicate pit file ilk events", func() {
-			err = pitFileRepository.Create(headerID, []ilk.PitFileIlkModel{test_data.PitFileIlkModel})
+			err = pitFileRepository.Create(headerID, []interface{}{test_data.PitFileIlkModel})
 
 			Expect(err).To(HaveOccurred())
 			Expect(err.Error()).To(ContainSubstring("pq: duplicate key value violates unique constraint"))
@@ -90,6 +92,12 @@ var _ = Describe("Pit file ilk repository", func() {
 			Expect(err).To(HaveOccurred())
 			Expect(err).To(MatchError(sql.ErrNoRows))
 		})
+
+		It("Returns an error if model is of wrong type", func() {
+			err = pitFileRepository.Create(headerID, []interface{}{test_data.WrongModel{}})
+			Expect(err).To(HaveOccurred())
+			Expect(err.Error()).To(ContainSubstring("model of type"))
+		})
 	})
 
 	Describe("MarkHeaderChecked", func() {
@@ -130,7 +138,7 @@ var _ = Describe("Pit file ilk repository", func() {
 		)
 
 		BeforeEach(func() {
-			startingBlock = GinkgoRandomSeed()
+			startingBlock = rand.Int63()
 			pitFileBlock = startingBlock + 1
 			endingBlock = startingBlock + 2
 
@@ -176,7 +184,9 @@ var _ = Describe("Pit file ilk repository", func() {
 				_, err = headerRepositoryTwo.CreateOrUpdateHeader(fakes.GetFakeHeader(n))
 				Expect(err).NotTo(HaveOccurred())
 			}
-			pitFileRepositoryTwo := ilk.NewPitFileIlkRepository(dbTwo)
+
+			pitFileRepositoryTwo := ilk.PitFileIlkRepository{}
+			pitFileRepositoryTwo.SetDB(dbTwo)
 			err := pitFileRepository.MarkHeaderChecked(headerIDs[0])
 			Expect(err).NotTo(HaveOccurred())
 

pkg/transformers/pit_file/ilk/transformer.go

@@ -1,79 +0,0 @@
-// Copyright 2018 Vulcanize
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package ilk
-
-import (
-	"log"
-
-	"github.com/ethereum/go-ethereum/common"
-
-	"github.com/vulcanize/vulcanizedb/pkg/core"
-	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/pit_file"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
-)
-
-type PitFileIlkTransformer struct {
-	Config     shared.TransformerConfig
-	Converter  Converter
-	Fetcher    shared.LogFetcher
-	Repository Repository
-}
-
-type PitFileIlkTransformerInitializer struct {
-	Config shared.TransformerConfig
-}
-
-func (initializer PitFileIlkTransformerInitializer) NewPitFileIlkTransformer(db *postgres.DB, blockChain core.BlockChain) shared.Transformer {
-	converter := PitFileIlkConverter{}
-	fetcher := shared.NewFetcher(blockChain)
-	repository := NewPitFileIlkRepository(db)
-	return PitFileIlkTransformer{
-		Config:     initializer.Config,
-		Converter:  converter,
-		Fetcher:    fetcher,
-		Repository: repository,
-	}
-}
-
-func (transformer PitFileIlkTransformer) Execute() error {
-	missingHeaders, err := transformer.Repository.MissingHeaders(transformer.Config.StartingBlockNumber, transformer.Config.EndingBlockNumber)
-	if err != nil {
-		return err
-	}
-	log.Printf("Fetching pit file ilk event logs for %d headers \n", len(missingHeaders))
-	for _, header := range missingHeaders {
-		topics := [][]common.Hash{{common.HexToHash(shared.PitFileIlkSignature)}}
-		matchingLogs, err := transformer.Fetcher.FetchLogs(pit_file.PitFileConfig.ContractAddresses, topics, header.BlockNumber)
-		if err != nil {
-			return err
-		}
-		if len(matchingLogs) < 1 {
-			err = transformer.Repository.MarkHeaderChecked(header.Id)
-			if err != nil {
-				return err
-			}
-		}
-		models, err := transformer.Converter.ToModels(matchingLogs)
-		if err != nil {
-			return err
-		}
-		err = transformer.Repository.Create(header.Id, models)
-		if err != nil {
-			return err
-		}
-	}
-	return nil
-}

pkg/transformers/pit_file/ilk/transformer_test.go

@@ -19,42 +19,58 @@ import (
 	"github.com/ethereum/go-ethereum/core/types"
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/factories"
+	"math/rand"
 
 	"github.com/vulcanize/vulcanizedb/pkg/core"
 	"github.com/vulcanize/vulcanizedb/pkg/fakes"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/pit_file"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/pit_file/ilk"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/test_data"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/test_data/mocks"
-	pit_file_ilk_mocks "github.com/vulcanize/vulcanizedb/pkg/transformers/test_data/mocks/pit_file/ilk"
+	ilk_mocks "github.com/vulcanize/vulcanizedb/pkg/transformers/test_data/mocks/pit_file/ilk"
 )
 
 var _ = Describe("Pit file ilk transformer", func() {
-	It("gets missing headers for block numbers specified in config", func() {
-		repository := &pit_file_ilk_mocks.MockPitFileIlkRepository{}
-		transformer := ilk.PitFileIlkTransformer{
-			Config:     pit_file.PitFileConfig,
-			Fetcher:    &mocks.MockLogFetcher{},
-			Converter:  &pit_file_ilk_mocks.MockPitFileIlkConverter{},
-			Repository: repository,
-		}
+	var (
+		config      = ilk.IlkFileConfig
+		fetcher     mocks.MockLogFetcher
+		converter   ilk_mocks.MockPitFileIlkConverter
+		repository  ilk_mocks.MockPitFileIlkRepository
+		transformer shared.Transformer
+		headerOne   core.Header
+		headerTwo   core.Header
+	)
 
+	BeforeEach(func() {
+		fetcher = mocks.MockLogFetcher{}
+		converter = ilk_mocks.MockPitFileIlkConverter{}
+		repository = ilk_mocks.MockPitFileIlkRepository{}
+		headerOne = core.Header{Id: rand.Int63(), BlockNumber: rand.Int63()}
+		headerTwo = core.Header{Id: rand.Int63(), BlockNumber: rand.Int63()}
+		transformer = factories.Transformer{
+			Config:     config,
+			Converter:  &converter,
+			Repository: &repository,
+			Fetcher:    &fetcher,
+		}.NewTransformer(nil, nil)
+	})
+
+	It("sets the blockchain and database", func() {
+		Expect(fetcher.SetBcCalled).To(BeTrue())
+		Expect(repository.SetDbCalled).To(BeTrue())
+	})
+
+	It("gets missing headers for block numbers specified in config", func() {
 		err := transformer.Execute()
 
 		Expect(err).NotTo(HaveOccurred())
-		Expect(repository.PassedStartingBlockNumber).To(Equal(pit_file.PitFileConfig.StartingBlockNumber))
-		Expect(repository.PassedEndingBlockNumber).To(Equal(pit_file.PitFileConfig.EndingBlockNumber))
+		Expect(repository.PassedStartingBlockNumber).To(Equal(config.StartingBlockNumber))
+		Expect(repository.PassedEndingBlockNumber).To(Equal(config.EndingBlockNumber))
 	})
 
 	It("returns error if repository returns error for missing headers", func() {
-		repository := &pit_file_ilk_mocks.MockPitFileIlkRepository{}
-		repository.SetMissingHeadersErr(fakes.FakeError)
-		transformer := ilk.PitFileIlkTransformer{
-			Fetcher:    &mocks.MockLogFetcher{},
-			Converter:  &pit_file_ilk_mocks.MockPitFileIlkConverter{},
-			Repository: repository,
-		}
+		repository.SetMissingHeadersError(fakes.FakeError)
 
 		err := transformer.Execute()
 
@@ -63,33 +79,19 @@ var _ = Describe("Pit file ilk transformer", func() {
 	})
 
 	It("fetches logs for missing headers", func() {
-		fetcher := &mocks.MockLogFetcher{}
-		repository := &pit_file_ilk_mocks.MockPitFileIlkRepository{}
-		repository.SetMissingHeaders([]core.Header{{BlockNumber: 1}, {BlockNumber: 2}})
-		transformer := ilk.PitFileIlkTransformer{
-			Fetcher:    fetcher,
-			Converter:  &pit_file_ilk_mocks.MockPitFileIlkConverter{},
-			Repository: repository,
-		}
+		repository.SetMissingHeaders([]core.Header{headerOne, headerTwo})
 
 		err := transformer.Execute()
 
 		Expect(err).NotTo(HaveOccurred())
-		Expect(fetcher.FetchedBlocks).To(Equal([]int64{1, 2}))
-		Expect(fetcher.FetchedContractAddresses).To(Equal([][]string{pit_file.PitFileConfig.ContractAddresses, pit_file.PitFileConfig.ContractAddresses}))
+		Expect(fetcher.FetchedBlocks).To(Equal([]int64{headerOne.BlockNumber, headerTwo.BlockNumber}))
+		Expect(fetcher.FetchedContractAddresses).To(Equal([][]string{config.ContractAddresses, config.ContractAddresses}))
 		Expect(fetcher.FetchedTopics).To(Equal([][]common.Hash{{common.HexToHash(shared.PitFileIlkSignature)}}))
 	})
 
 	It("returns error if fetcher returns error", func() {
-		fetcher := &mocks.MockLogFetcher{}
 		fetcher.SetFetcherError(fakes.FakeError)
-		repository := &pit_file_ilk_mocks.MockPitFileIlkRepository{}
-		repository.SetMissingHeaders([]core.Header{{BlockNumber: 1}})
-		transformer := ilk.PitFileIlkTransformer{
-			Fetcher:    fetcher,
-			Converter:  &pit_file_ilk_mocks.MockPitFileIlkConverter{},
-			Repository: repository,
-		}
+		repository.SetMissingHeaders([]core.Header{headerOne})
 
 		err := transformer.Execute()
 
@@ -98,34 +100,17 @@ var _ = Describe("Pit file ilk transformer", func() {
 	})
 
 	It("marks header checked if no logs returned", func() {
-		mockConverter := &pit_file_ilk_mocks.MockPitFileIlkConverter{}
-		mockRepository := &pit_file_ilk_mocks.MockPitFileIlkRepository{}
-		headerID := int64(123)
-		mockRepository.SetMissingHeaders([]core.Header{{Id: headerID}})
-		mockFetcher := &mocks.MockLogFetcher{}
-		transformer := ilk.PitFileIlkTransformer{
-			Converter:  mockConverter,
-			Fetcher:    mockFetcher,
-			Repository: mockRepository,
-		}
+		repository.SetMissingHeaders([]core.Header{headerOne})
 
 		err := transformer.Execute()
 
 		Expect(err).NotTo(HaveOccurred())
-		mockRepository.AssertMarkHeaderCheckedCalledWith(headerID)
+		repository.AssertMarkHeaderCheckedCalledWith(headerOne.Id)
 	})
 
 	It("returns error if marking header checked returns err", func() {
-		mockConverter := &pit_file_ilk_mocks.MockPitFileIlkConverter{}
-		mockRepository := &pit_file_ilk_mocks.MockPitFileIlkRepository{}
-		mockRepository.SetMissingHeaders([]core.Header{{Id: int64(123)}})
-		mockRepository.SetMarkHeaderCheckedErr(fakes.FakeError)
-		mockFetcher := &mocks.MockLogFetcher{}
-		transformer := ilk.PitFileIlkTransformer{
-			Converter:  mockConverter,
-			Fetcher:    mockFetcher,
-			Repository: mockRepository,
-		}
+		repository.SetMissingHeaders([]core.Header{headerOne})
+		repository.SetMarkHeaderCheckedError(fakes.FakeError)
 
 		err := transformer.Execute()
 
@@ -134,16 +119,8 @@ var _ = Describe("Pit file ilk transformer", func() {
 	})
 
 	It("converts matching logs", func() {
-		converter := &pit_file_ilk_mocks.MockPitFileIlkConverter{}
-		fetcher := &mocks.MockLogFetcher{}
 		fetcher.SetFetchedLogs([]types.Log{test_data.EthPitFileIlkLog})
-		repository := &pit_file_ilk_mocks.MockPitFileIlkRepository{}
-		repository.SetMissingHeaders([]core.Header{{BlockNumber: 1}})
-		transformer := ilk.PitFileIlkTransformer{
-			Fetcher:    fetcher,
-			Converter:  converter,
-			Repository: repository,
-		}
+		repository.SetMissingHeaders([]core.Header{headerOne})
 
 		err := transformer.Execute()
 
@@ -152,17 +129,9 @@ var _ = Describe("Pit file ilk transformer", func() {
 	})
 
 	It("returns error if converter returns error", func() {
-		converter := &pit_file_ilk_mocks.MockPitFileIlkConverter{}
 		converter.SetConverterError(fakes.FakeError)
-		fetcher := &mocks.MockLogFetcher{}
 		fetcher.SetFetchedLogs([]types.Log{test_data.EthPitFileIlkLog})
-		repository := &pit_file_ilk_mocks.MockPitFileIlkRepository{}
-		repository.SetMissingHeaders([]core.Header{{BlockNumber: 1}})
-		transformer := ilk.PitFileIlkTransformer{
-			Fetcher:    fetcher,
-			Converter:  converter,
-			Repository: repository,
-		}
+		repository.SetMissingHeaders([]core.Header{headerOne})
 
 		err := transformer.Execute()
 
@@ -171,37 +140,20 @@ var _ = Describe("Pit file ilk transformer", func() {
 	})
 
 	It("persists pit file model", func() {
-		converter := &pit_file_ilk_mocks.MockPitFileIlkConverter{}
-		fetcher := &mocks.MockLogFetcher{}
 		fetcher.SetFetchedLogs([]types.Log{test_data.EthPitFileIlkLog})
-		repository := &pit_file_ilk_mocks.MockPitFileIlkRepository{}
-		fakeHeader := core.Header{BlockNumber: 1, Id: 2}
-		repository.SetMissingHeaders([]core.Header{fakeHeader})
-		transformer := ilk.PitFileIlkTransformer{
-			Fetcher:    fetcher,
-			Converter:  converter,
-			Repository: repository,
-		}
+		repository.SetMissingHeaders([]core.Header{headerOne})
 
 		err := transformer.Execute()
 
 		Expect(err).NotTo(HaveOccurred())
-		Expect(repository.PassedHeaderID).To(Equal(fakeHeader.Id))
-		Expect(repository.PassedModels).To(Equal([]ilk.PitFileIlkModel{test_data.PitFileIlkModel}))
+		Expect(repository.PassedHeaderID).To(Equal(headerOne.Id))
+		Expect(repository.PassedModels).To(Equal([]interface{}{test_data.PitFileIlkModel}))
 	})
 
 	It("returns error if repository returns error for create", func() {
-		converter := &pit_file_ilk_mocks.MockPitFileIlkConverter{}
-		fetcher := &mocks.MockLogFetcher{}
 		fetcher.SetFetchedLogs([]types.Log{test_data.EthPitFileIlkLog})
-		repository := &pit_file_ilk_mocks.MockPitFileIlkRepository{}
-		repository.SetMissingHeaders([]core.Header{{BlockNumber: 1, Id: 2}})
+		repository.SetMissingHeaders([]core.Header{headerOne})
 		repository.SetCreateError(fakes.FakeError)
-		transformer := ilk.PitFileIlkTransformer{
-			Fetcher:    fetcher,
-			Converter:  converter,
-			Repository: repository,
-		}
 
 		err := transformer.Execute()
 

pkg/transformers/pit_file/stability_fee/config.go

@@ -0,0 +1,28 @@
+// Copyright 2018 Vulcanize
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package stability_fee
+
+import (
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
+)
+
+var StabilityFeeFileConfig = shared.SingleTransformerConfig{
+	TransformerName:     shared.PitFileStabilityFeeLabel,
+	ContractAddresses:   []string{shared.PitContractAddress},
+	ContractAbi:         shared.PitABI,
+	Topic:               shared.PitFileStabilityFeeSignature,
+	StartingBlockNumber: 0,
+	EndingBlockNumber:   10000000,
+}

pkg/transformers/pit_file/stability_fee/converter.go

@@ -23,14 +23,10 @@ import (
 	"github.com/ethereum/go-ethereum/core/types"
 )
 
-type Converter interface {
-	ToModels(ethLogs []types.Log) ([]PitFileStabilityFeeModel, error)
-}
-
 type PitFileStabilityFeeConverter struct{}
 
-func (PitFileStabilityFeeConverter) ToModels(ethLogs []types.Log) ([]PitFileStabilityFeeModel, error) {
-	var models []PitFileStabilityFeeModel
+func (PitFileStabilityFeeConverter) ToModels(ethLogs []types.Log) ([]interface{}, error) {
+	var models []interface{}
 	for _, ethLog := range ethLogs {
 		err := verifyLog(ethLog)
 		if err != nil {

pkg/transformers/pit_file/stability_fee/repository.go

@@ -15,50 +15,50 @@
 package stability_fee
 
 import (
+	"fmt"
 	"github.com/vulcanize/vulcanizedb/pkg/core"
 	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
 )
 
-type Repository interface {
-	Create(headerID int64, models []PitFileStabilityFeeModel) error
-	MarkHeaderChecked(headerID int64) error
-	MissingHeaders(startingBlockNumber, endingBlockNumber int64) ([]core.Header, error)
-}
-
 type PitFileStabilityFeeRepository struct {
 	db *postgres.DB
 }
 
-func NewPitFileStabilityFeeRepository(db *postgres.DB) PitFileStabilityFeeRepository {
-	return PitFileStabilityFeeRepository{
-		db: db,
-	}
-}
-
-func (repository PitFileStabilityFeeRepository) Create(headerID int64, models []PitFileStabilityFeeModel) error {
+func (repository PitFileStabilityFeeRepository) Create(headerID int64, models []interface{}) error {
 	tx, err := repository.db.Begin()
 	if err != nil {
 		return err
 	}
+
 	for _, model := range models {
+		pitFileSF, ok := model.(PitFileStabilityFeeModel)
+		if !ok {
+			tx.Rollback()
+			return fmt.Errorf("model of type %T, not %T", model, PitFileStabilityFeeModel{})
+		}
+
 		_, err = tx.Exec(
 			`INSERT into maker.pit_file_stability_fee (header_id, what, data, tx_idx, raw_log)
         VALUES($1, $2, $3, $4, $5)`,
-			headerID, model.What, model.Data, model.TransactionIndex, model.Raw,
+			headerID, pitFileSF.What, pitFileSF.Data, pitFileSF.TransactionIndex, pitFileSF.Raw,
 		)
+
 		if err != nil {
 			tx.Rollback()
 			return err
 		}
 	}
+
 	_, err = tx.Exec(`INSERT INTO public.checked_headers (header_id, pit_file_stability_fee_checked)
 		VALUES ($1, $2) 
 	ON CONFLICT (header_id) DO
 		UPDATE SET pit_file_stability_fee_checked = $2`, headerID, true)
+
 	if err != nil {
 		tx.Rollback()
 		return err
 	}
+
 	return tx.Commit()
 }
 
@@ -86,3 +86,7 @@ func (repository PitFileStabilityFeeRepository) MissingHeaders(startingBlockNumb
 	)
 	return result, err
 }
+
+func (repository *PitFileStabilityFeeRepository) SetDB(db *postgres.DB) {
+	repository.db = db
+}

pkg/transformers/pit_file/stability_fee/repository_test.go

@@ -16,6 +16,7 @@ package stability_fee_test
 
 import (
 	"database/sql"
+	"math/rand"
 
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
@@ -32,17 +33,18 @@ import (
 
 var _ = Describe("Pit file stability fee repository", func() {
 	var (
-		db                *postgres.DB
-		pitFileRepository stability_fee.Repository
-		err               error
-		headerRepository  datastore.HeaderRepository
+		db                            *postgres.DB
+		pitFileStabilityFeeRepository stability_fee.PitFileStabilityFeeRepository
+		err                           error
+		headerRepository              datastore.HeaderRepository
 	)
 
 	BeforeEach(func() {
 		db = test_config.NewTestDB(core.Node{})
 		test_config.CleanTestDB(db)
 		headerRepository = repositories.NewHeaderRepository(db)
-		pitFileRepository = stability_fee.NewPitFileStabilityFeeRepository(db)
+		pitFileStabilityFeeRepository = stability_fee.PitFileStabilityFeeRepository{}
+		pitFileStabilityFeeRepository.SetDB(db)
 	})
 
 	Describe("Create", func() {
@@ -52,7 +54,7 @@ var _ = Describe("Pit file stability fee repository", func() {
 			headerID, err = headerRepository.CreateOrUpdateHeader(fakes.FakeHeader)
 			Expect(err).NotTo(HaveOccurred())
 
-			err = pitFileRepository.Create(headerID, []stability_fee.PitFileStabilityFeeModel{test_data.PitFileStabilityFeeModel})
+			err = pitFileStabilityFeeRepository.Create(headerID, []interface{}{test_data.PitFileStabilityFeeModel})
 			Expect(err).NotTo(HaveOccurred())
 		})
 
@@ -74,7 +76,7 @@ var _ = Describe("Pit file stability fee repository", func() {
 		})
 
 		It("does not duplicate pit file events", func() {
-			err = pitFileRepository.Create(headerID, []stability_fee.PitFileStabilityFeeModel{test_data.PitFileStabilityFeeModel})
+			err = pitFileStabilityFeeRepository.Create(headerID, []interface{}{test_data.PitFileStabilityFeeModel})
 
 			Expect(err).To(HaveOccurred())
 			Expect(err.Error()).To(ContainSubstring("pq: duplicate key value violates unique constraint"))
@@ -89,6 +91,12 @@ var _ = Describe("Pit file stability fee repository", func() {
 			Expect(err).To(HaveOccurred())
 			Expect(err).To(MatchError(sql.ErrNoRows))
 		})
+
+		It("Returns an error if model is of wrong type", func() {
+			err = pitFileStabilityFeeRepository.Create(headerID, []interface{}{test_data.WrongModel{}})
+			Expect(err).To(HaveOccurred())
+			Expect(err.Error()).To(ContainSubstring("model of type"))
+		})
 	})
 
 	Describe("MarkHeaderChecked", func() {
@@ -100,7 +108,7 @@ var _ = Describe("Pit file stability fee repository", func() {
 		})
 
 		It("creates a row for a new headerID", func() {
-			err = pitFileRepository.MarkHeaderChecked(headerID)
+			err = pitFileStabilityFeeRepository.MarkHeaderChecked(headerID)
 
 			Expect(err).NotTo(HaveOccurred())
 			var headerChecked bool
@@ -112,7 +120,7 @@ var _ = Describe("Pit file stability fee repository", func() {
 		It("updates row when headerID already exists", func() {
 			_, err = db.Exec(`INSERT INTO public.checked_headers (header_id) VALUES ($1)`, headerID)
 
-			err = pitFileRepository.MarkHeaderChecked(headerID)
+			err = pitFileStabilityFeeRepository.MarkHeaderChecked(headerID)
 
 			Expect(err).NotTo(HaveOccurred())
 			var headerChecked bool
@@ -129,7 +137,7 @@ var _ = Describe("Pit file stability fee repository", func() {
 		)
 
 		BeforeEach(func() {
-			startingBlock = GinkgoRandomSeed()
+			startingBlock = rand.Int63()
 			pitFileBlock = startingBlock + 1
 			endingBlock = startingBlock + 2
 
@@ -144,10 +152,10 @@ var _ = Describe("Pit file stability fee repository", func() {
 		})
 
 		It("returns headers that haven't been checked", func() {
-			err := pitFileRepository.MarkHeaderChecked(headerIDs[1])
+			err = pitFileStabilityFeeRepository.MarkHeaderChecked(headerIDs[1])
 			Expect(err).NotTo(HaveOccurred())
 
-			headers, err := pitFileRepository.MissingHeaders(startingBlock, endingBlock)
+			headers, err := pitFileStabilityFeeRepository.MissingHeaders(startingBlock, endingBlock)
 
 			Expect(err).NotTo(HaveOccurred())
 			Expect(len(headers)).To(Equal(2))
@@ -156,10 +164,10 @@ var _ = Describe("Pit file stability fee repository", func() {
 		})
 
 		It("only treats headers as checked if pit file stability fee logs have been checked", func() {
-			_, err := db.Exec(`INSERT INTO public.checked_headers (header_id) VALUES ($1)`, headerIDs[1])
+			_, err = db.Exec(`INSERT INTO public.checked_headers (header_id) VALUES ($1)`, headerIDs[1])
 			Expect(err).NotTo(HaveOccurred())
 
-			headers, err := pitFileRepository.MissingHeaders(startingBlock, endingBlock)
+			headers, err := pitFileStabilityFeeRepository.MissingHeaders(startingBlock, endingBlock)
 
 			Expect(err).NotTo(HaveOccurred())
 			Expect(len(headers)).To(Equal(3))
@@ -175,11 +183,13 @@ var _ = Describe("Pit file stability fee repository", func() {
 				_, err = headerRepositoryTwo.CreateOrUpdateHeader(fakes.GetFakeHeader(n))
 				Expect(err).NotTo(HaveOccurred())
 			}
-			pitFileRepositoryTwo := stability_fee.NewPitFileStabilityFeeRepository(dbTwo)
-			err := pitFileRepository.MarkHeaderChecked(headerIDs[0])
+
+			pitFileRepositoryTwo := stability_fee.PitFileStabilityFeeRepository{}
+			pitFileRepositoryTwo.SetDB(dbTwo)
+			err = pitFileStabilityFeeRepository.MarkHeaderChecked(headerIDs[0])
 			Expect(err).NotTo(HaveOccurred())
 
-			nodeOneMissingHeaders, err := pitFileRepository.MissingHeaders(blockNumbers[0], blockNumbers[len(blockNumbers)-1])
+			nodeOneMissingHeaders, err := pitFileStabilityFeeRepository.MissingHeaders(blockNumbers[0], blockNumbers[len(blockNumbers)-1])
 			Expect(err).NotTo(HaveOccurred())
 			Expect(len(nodeOneMissingHeaders)).To(Equal(len(blockNumbers) - 1))
 

pkg/transformers/pit_file/stability_fee/transformer.go

@@ -1,79 +0,0 @@
-// Copyright 2018 Vulcanize
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package stability_fee
-
-import (
-	"log"
-
-	"github.com/ethereum/go-ethereum/common"
-
-	"github.com/vulcanize/vulcanizedb/pkg/core"
-	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/pit_file"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
-)
-
-type PitFileStabilityFeeTransformer struct {
-	Config     shared.TransformerConfig
-	Converter  Converter
-	Fetcher    shared.LogFetcher
-	Repository Repository
-}
-
-type PitFileStabilityFeeTransformerInitializer struct {
-	Config shared.TransformerConfig
-}
-
-func (initializer PitFileStabilityFeeTransformerInitializer) NewPitFileStabilityFeeTransformer(db *postgres.DB, blockChain core.BlockChain) shared.Transformer {
-	converter := PitFileStabilityFeeConverter{}
-	fetcher := shared.NewFetcher(blockChain)
-	repository := NewPitFileStabilityFeeRepository(db)
-	return PitFileStabilityFeeTransformer{
-		Config:     initializer.Config,
-		Converter:  converter,
-		Fetcher:    fetcher,
-		Repository: repository,
-	}
-}
-
-func (transformer PitFileStabilityFeeTransformer) Execute() error {
-	missingHeaders, err := transformer.Repository.MissingHeaders(transformer.Config.StartingBlockNumber, transformer.Config.EndingBlockNumber)
-	if err != nil {
-		return err
-	}
-	log.Printf("Fetching pit file stability fee event logs for %d headers \n", len(missingHeaders))
-	for _, header := range missingHeaders {
-		topics := [][]common.Hash{{common.HexToHash(shared.PitFileStabilityFeeSignature)}}
-		matchingLogs, err := transformer.Fetcher.FetchLogs(pit_file.PitFileConfig.ContractAddresses, topics, header.BlockNumber)
-		if err != nil {
-			return err
-		}
-		if len(matchingLogs) < 1 {
-			err = transformer.Repository.MarkHeaderChecked(header.Id)
-			if err != nil {
-				return err
-			}
-		}
-		models, err := transformer.Converter.ToModels(matchingLogs)
-		if err != nil {
-			return err
-		}
-		err = transformer.Repository.Create(header.Id, models)
-		if err != nil {
-			return err
-		}
-	}
-	return nil
-}

pkg/transformers/pit_file/stability_fee/transformer_test.go

@@ -19,11 +19,12 @@ import (
 	"github.com/ethereum/go-ethereum/core/types"
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/factories"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/pit_file/stability_fee"
+	"math/rand"
 
 	"github.com/vulcanize/vulcanizedb/pkg/core"
 	"github.com/vulcanize/vulcanizedb/pkg/fakes"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/pit_file"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/pit_file/stability_fee"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/test_data"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/test_data/mocks"
@@ -31,31 +32,45 @@ import (
 )
 
 var _ = Describe("Pit file stability fee transformer", func() {
-	It("gets missing headers for block numbers specified in config", func() {
-		repository := &stability_fee_mocks.MockPitFileStabilityFeeRepository{}
-		transformer := stability_fee.PitFileStabilityFeeTransformer{
-			Config:     pit_file.PitFileConfig,
-			Fetcher:    &mocks.MockLogFetcher{},
-			Converter:  &stability_fee_mocks.MockPitFileStabilityFeeConverter{},
-			Repository: repository,
-		}
+	var (
+		config      = stability_fee.StabilityFeeFileConfig
+		fetcher     mocks.MockLogFetcher
+		converter   stability_fee_mocks.MockPitFileStabilityFeeConverter
+		repository  stability_fee_mocks.MockPitFileStabilityFeeRepository
+		transformer shared.Transformer
+		headerOne   core.Header
+		headerTwo   core.Header
+	)
 
+	BeforeEach(func() {
+		fetcher = mocks.MockLogFetcher{}
+		converter = stability_fee_mocks.MockPitFileStabilityFeeConverter{}
+		repository = stability_fee_mocks.MockPitFileStabilityFeeRepository{}
+		transformer = factories.Transformer{
+			Config:     config,
+			Fetcher:    &fetcher,
+			Converter:  &converter,
+			Repository: &repository,
+		}.NewTransformer(nil, nil)
+		headerOne = core.Header{Id: rand.Int63(), BlockNumber: rand.Int63()}
+		headerTwo = core.Header{Id: rand.Int63(), BlockNumber: rand.Int63()}
+	})
+
+	It("sets the blockchain and database", func() {
+		Expect(fetcher.SetBcCalled).To(BeTrue())
+		Expect(repository.SetDbCalled).To(BeTrue())
+	})
+
+	It("gets missing headers for block numbers specified in config", func() {
 		err := transformer.Execute()
 
 		Expect(err).NotTo(HaveOccurred())
-		Expect(repository.PassedStartingBlockNumber).To(Equal(pit_file.PitFileConfig.StartingBlockNumber))
-		Expect(repository.PassedEndingBlockNumber).To(Equal(pit_file.PitFileConfig.EndingBlockNumber))
+		Expect(repository.PassedStartingBlockNumber).To(Equal(config.StartingBlockNumber))
+		Expect(repository.PassedEndingBlockNumber).To(Equal(config.EndingBlockNumber))
 	})
 
 	It("returns error if repository returns error for missing headers", func() {
-		repository := &stability_fee_mocks.MockPitFileStabilityFeeRepository{}
 		repository.SetMissingHeadersErr(fakes.FakeError)
-		transformer := stability_fee.PitFileStabilityFeeTransformer{
-			Fetcher:    &mocks.MockLogFetcher{},
-			Converter:  &stability_fee_mocks.MockPitFileStabilityFeeConverter{},
-			Repository: repository,
-		}
-
 		err := transformer.Execute()
 
 		Expect(err).To(HaveOccurred())
@@ -63,33 +78,19 @@ var _ = Describe("Pit file stability fee transformer", func() {
 	})
 
 	It("fetches logs for missing headers", func() {
-		fetcher := &mocks.MockLogFetcher{}
-		repository := &stability_fee_mocks.MockPitFileStabilityFeeRepository{}
-		repository.SetMissingHeaders([]core.Header{{BlockNumber: 1}, {BlockNumber: 2}})
-		transformer := stability_fee.PitFileStabilityFeeTransformer{
-			Fetcher:    fetcher,
-			Converter:  &stability_fee_mocks.MockPitFileStabilityFeeConverter{},
-			Repository: repository,
-		}
-
+		repository.SetMissingHeaders([]core.Header{headerOne, headerTwo})
 		err := transformer.Execute()
 
 		Expect(err).NotTo(HaveOccurred())
-		Expect(fetcher.FetchedBlocks).To(Equal([]int64{1, 2}))
-		Expect(fetcher.FetchedContractAddresses).To(Equal([][]string{pit_file.PitFileConfig.ContractAddresses, pit_file.PitFileConfig.ContractAddresses}))
+		Expect(fetcher.FetchedBlocks).To(Equal([]int64{headerOne.BlockNumber, headerTwo.BlockNumber}))
+		Expect(fetcher.FetchedContractAddresses).To(Equal([][]string{
+			config.ContractAddresses, config.ContractAddresses}))
 		Expect(fetcher.FetchedTopics).To(Equal([][]common.Hash{{common.HexToHash(shared.PitFileStabilityFeeSignature)}}))
 	})
 
 	It("returns error if fetcher returns error", func() {
-		fetcher := &mocks.MockLogFetcher{}
 		fetcher.SetFetcherError(fakes.FakeError)
-		repository := &stability_fee_mocks.MockPitFileStabilityFeeRepository{}
-		repository.SetMissingHeaders([]core.Header{{BlockNumber: 1}})
-		transformer := stability_fee.PitFileStabilityFeeTransformer{
-			Fetcher:    fetcher,
-			Converter:  &stability_fee_mocks.MockPitFileStabilityFeeConverter{},
-			Repository: repository,
-		}
+		repository.SetMissingHeaders([]core.Header{headerOne})
 
 		err := transformer.Execute()
 
@@ -98,34 +99,17 @@ var _ = Describe("Pit file stability fee transformer", func() {
 	})
 
 	It("marks header checked if no logs returned", func() {
-		mockConverter := &stability_fee_mocks.MockPitFileStabilityFeeConverter{}
-		mockRepository := &stability_fee_mocks.MockPitFileStabilityFeeRepository{}
-		headerID := int64(123)
-		mockRepository.SetMissingHeaders([]core.Header{{Id: headerID}})
-		mockFetcher := &mocks.MockLogFetcher{}
-		transformer := stability_fee.PitFileStabilityFeeTransformer{
-			Converter:  mockConverter,
-			Fetcher:    mockFetcher,
-			Repository: mockRepository,
-		}
+		repository.SetMissingHeaders([]core.Header{headerOne})
 
 		err := transformer.Execute()
 
 		Expect(err).NotTo(HaveOccurred())
-		mockRepository.AssertMarkHeaderCheckedCalledWith(headerID)
+		repository.AssertMarkHeaderCheckedCalledWith(headerOne.Id)
 	})
 
 	It("returns error if marking header checked returns err", func() {
-		mockConverter := &stability_fee_mocks.MockPitFileStabilityFeeConverter{}
-		mockRepository := &stability_fee_mocks.MockPitFileStabilityFeeRepository{}
-		mockRepository.SetMissingHeaders([]core.Header{{Id: int64(123)}})
-		mockRepository.SetMarkHeaderCheckedErr(fakes.FakeError)
-		mockFetcher := &mocks.MockLogFetcher{}
-		transformer := stability_fee.PitFileStabilityFeeTransformer{
-			Converter:  mockConverter,
-			Fetcher:    mockFetcher,
-			Repository: mockRepository,
-		}
+		repository.SetMissingHeaders([]core.Header{headerOne})
+		repository.SetMarkHeaderCheckedErr(fakes.FakeError)
 
 		err := transformer.Execute()
 
@@ -134,16 +118,8 @@ var _ = Describe("Pit file stability fee transformer", func() {
 	})
 
 	It("converts matching logs", func() {
-		converter := &stability_fee_mocks.MockPitFileStabilityFeeConverter{}
-		fetcher := &mocks.MockLogFetcher{}
 		fetcher.SetFetchedLogs([]types.Log{test_data.EthPitFileStabilityFeeLog})
-		repository := &stability_fee_mocks.MockPitFileStabilityFeeRepository{}
-		repository.SetMissingHeaders([]core.Header{{BlockNumber: 1}})
-		transformer := stability_fee.PitFileStabilityFeeTransformer{
-			Fetcher:    fetcher,
-			Converter:  converter,
-			Repository: repository,
-		}
+		repository.SetMissingHeaders([]core.Header{headerOne})
 
 		err := transformer.Execute()
 
@@ -152,17 +128,9 @@ var _ = Describe("Pit file stability fee transformer", func() {
 	})
 
 	It("returns error if converter returns error", func() {
-		converter := &stability_fee_mocks.MockPitFileStabilityFeeConverter{}
 		converter.SetConverterError(fakes.FakeError)
-		fetcher := &mocks.MockLogFetcher{}
 		fetcher.SetFetchedLogs([]types.Log{test_data.EthPitFileStabilityFeeLog})
-		repository := &stability_fee_mocks.MockPitFileStabilityFeeRepository{}
-		repository.SetMissingHeaders([]core.Header{{BlockNumber: 1}})
-		transformer := stability_fee.PitFileStabilityFeeTransformer{
-			Fetcher:    fetcher,
-			Converter:  converter,
-			Repository: repository,
-		}
+		repository.SetMissingHeaders([]core.Header{headerOne})
 
 		err := transformer.Execute()
 
@@ -171,37 +139,20 @@ var _ = Describe("Pit file stability fee transformer", func() {
 	})
 
 	It("persists pit file model", func() {
-		converter := &stability_fee_mocks.MockPitFileStabilityFeeConverter{}
-		fetcher := &mocks.MockLogFetcher{}
 		fetcher.SetFetchedLogs([]types.Log{test_data.EthPitFileStabilityFeeLog})
-		repository := &stability_fee_mocks.MockPitFileStabilityFeeRepository{}
-		fakeHeader := core.Header{BlockNumber: 1, Id: 2}
-		repository.SetMissingHeaders([]core.Header{fakeHeader})
-		transformer := stability_fee.PitFileStabilityFeeTransformer{
-			Fetcher:    fetcher,
-			Converter:  converter,
-			Repository: repository,
-		}
+		repository.SetMissingHeaders([]core.Header{headerOne})
 
 		err := transformer.Execute()
 
 		Expect(err).NotTo(HaveOccurred())
-		Expect(repository.PassedHeaderID).To(Equal(fakeHeader.Id))
-		Expect(repository.PassedModels).To(Equal([]stability_fee.PitFileStabilityFeeModel{test_data.PitFileStabilityFeeModel}))
+		Expect(repository.PassedHeaderID).To(Equal(headerOne.Id))
+		Expect(repository.PassedModels).To(Equal([]interface{}{test_data.PitFileStabilityFeeModel}))
 	})
 
 	It("returns error if repository returns error for create", func() {
-		converter := &stability_fee_mocks.MockPitFileStabilityFeeConverter{}
-		fetcher := &mocks.MockLogFetcher{}
 		fetcher.SetFetchedLogs([]types.Log{test_data.EthPitFileStabilityFeeLog})
-		repository := &stability_fee_mocks.MockPitFileStabilityFeeRepository{}
-		repository.SetMissingHeaders([]core.Header{{BlockNumber: 1, Id: 2}})
+		repository.SetMissingHeaders([]core.Header{headerOne})
 		repository.SetCreateError(fakes.FakeError)
-		transformer := stability_fee.PitFileStabilityFeeTransformer{
-			Fetcher:    fetcher,
-			Converter:  converter,
-			Repository: repository,
-		}
 
 		err := transformer.Execute()
 

pkg/transformers/shared/constants.go

@@ -102,4 +102,32 @@ var (
 	VatTollSignature             = GetLogNoteSignature(vatTollMethod)
 	VatTuneSignature             = GetLogNoteSignature(vatTuneMethod)
 	VatFluxSignature             = GetLogNoteSignature(vatFluxMethod)
+
+	BiteLabel                = "bite"
+	DealLabel                = "deal"
+	CatFileChopLumpLabel     = "catFileChopLump"
+	CatFileFlipLabel         = "catFileFlip"
+	CatFilePitVowLabel       = "catFilePitVow"
+	DentLabel                = "dent"
+	DripDripLabel            = "dripDrip"
+	DripFileIlkLabel         = "dripFileIlk"
+	DripFileRepoLabel        = "dripFileRepo"
+	DripFileVowLabel         = "dripFileVow"
+	FlipKickLabel            = "flipKick"
+	FlopKickLabel            = "flopKick"
+	FrobLabel                = "frob"
+	PitFileDebtCeilingLabel  = "pitFileDebtCeiling"
+	PitFileIlkLabel          = "pitFileIlk"
+	PitFileStabilityFeeLabel = "pitFileStabilityFee"
+	PriceFeedLabel           = "priceFeed"
+	TendLabel                = "tend"
+	VatHealLabel             = "vatHeal"
+	VatGrabLabel             = "vatGrab"
+	VatInitLabel             = "vatInit"
+	VatMoveLabel             = "vatMove"
+	VatFoldLabel             = "vatFold"
+	VatSlipLabel             = "vatSlip"
+	VatTollLabel             = "vatToll"
+	VatTuneLabel             = "vatTune"
+	VatFluxLabel             = "vatFlux"
 )

pkg/transformers/shared/log_fetcher.go

@@ -28,10 +28,19 @@ type LogFetcher interface {
 	FetchLogs(contractAddresses []string, topics [][]common.Hash, blockNumber int64) ([]types.Log, error)
 }
 
+type SettableLogFetcher interface {
+	LogFetcher
+	SetBC(bc core.BlockChain)
+}
+
 type Fetcher struct {
 	blockChain core.BlockChain
 }
 
+func (fetcher *Fetcher) SetBC(bc core.BlockChain) {
+	fetcher.blockChain = bc
+}
+
 func NewFetcher(blockchain core.BlockChain) Fetcher {
 	return Fetcher{
 		blockChain: blockchain,

pkg/transformers/shared/transformer.go

@@ -28,9 +28,19 @@ type Transformer interface {
 type TransformerInitializer func(db *postgres.DB, blockChain core.BlockChain) Transformer
 
 type TransformerConfig struct {
+	TransformerName     string
 	ContractAddresses   []string
 	ContractAbi         string
-	Topics              []string
+	Topics              []string // TODO Change this to single topic
+	StartingBlockNumber int64
+	EndingBlockNumber   int64
+}
+
+type SingleTransformerConfig struct {
+	TransformerName     string
+	ContractAddresses   []string
+	ContractAbi         string
+	Topic               string
 	StartingBlockNumber int64
 	EndingBlockNumber   int64
 }

pkg/transformers/tend/config.go

@@ -16,10 +16,11 @@ package tend
 
 import "github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
 
-var TendConfig = shared.TransformerConfig{
+var TendConfig = shared.SingleTransformerConfig{
+	TransformerName:     shared.TendLabel,
 	ContractAddresses:   []string{shared.FlipperContractAddress},
 	ContractAbi:         shared.FlipperABI,
-	Topics:              []string{shared.TendFunctionSignature},
+	Topic:               shared.TendFunctionSignature,
 	StartingBlockNumber: 0,
 	EndingBlockNumber:   10000000,
 }

pkg/transformers/tend/converter.go

@@ -23,17 +23,9 @@ import (
 	"github.com/ethereum/go-ethereum/core/types"
 )
 
-type Converter interface {
-	ToModels(ethLogs []types.Log) ([]TendModel, error)
-}
-
 type TendConverter struct{}
 
-func NewTendConverter() TendConverter {
-	return TendConverter{}
-}
-
-func (c TendConverter) ToModels(ethLogs []types.Log) (results []TendModel, err error) {
+func (TendConverter) ToModels(ethLogs []types.Log) (results []interface{}, err error) {
 	for _, ethLog := range ethLogs {
 		err := validateLog(ethLog)
 		if err != nil {

pkg/transformers/tend/converter_test.go

@@ -28,7 +28,7 @@ var _ = Describe("Tend TendConverter", func() {
 	var converter tend.TendConverter
 
 	BeforeEach(func() {
-		converter = tend.NewTendConverter()
+		converter = tend.TendConverter{}
 	})
 
 	Describe("ToModels", func() {

pkg/transformers/tend/repository.go

@@ -15,35 +15,34 @@
 package tend
 
 import (
+	"fmt"
 	"github.com/vulcanize/vulcanizedb/pkg/core"
 	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
 )
 
-type Repository interface {
-	Create(headerId int64, tends []TendModel) error
-	MarkHeaderChecked(headerId int64) error
-	MissingHeaders(startingBlockNumber, endingBlockNumber int64) ([]core.Header, error)
-}
-
 type TendRepository struct {
-	DB *postgres.DB
+	db *postgres.DB
 }
 
-func NewTendRepository(db *postgres.DB) TendRepository {
-	return TendRepository{DB: db}
-}
-
-func (r TendRepository) Create(headerId int64, tends []TendModel) error {
-	tx, err := r.DB.Begin()
+func (repository TendRepository) Create(headerId int64, models []interface{}) error {
+	tx, err := repository.db.Begin()
 	if err != nil {
 		return err
 	}
-	for _, tend := range tends {
+
+	for _, model := range models {
+		tend, ok := model.(TendModel)
+		if !ok {
+			tx.Rollback()
+			return fmt.Errorf("model of type %T, not %T", model, TendModel{})
+		}
+
 		_, err = tx.Exec(
 			`INSERT into maker.tend (header_id, bid_id, lot, bid, guy, tic, tx_idx, raw_log)
-        VALUES($1, $2, $3, $4, $5, $6, $7, $8)`,
+        	VALUES($1, $2, $3, $4, $5, $6, $7, $8)`,
 			headerId, tend.BidId, tend.Lot, tend.Bid, tend.Guy, tend.Tic, tend.TransactionIndex, tend.Raw,
 		)
+
 		if err != nil {
 			tx.Rollback()
 			return err
@@ -53,6 +52,7 @@ func (r TendRepository) Create(headerId int64, tends []TendModel) error {
 			VALUES ($1, $2)
 		ON CONFLICT (header_id) DO
 			UPDATE SET tend_checked = $2`, headerId, true)
+
 	if err != nil {
 		tx.Rollback()
 		return err
@@ -60,28 +60,32 @@ func (r TendRepository) Create(headerId int64, tends []TendModel) error {
 	return tx.Commit()
 }
 
-func (r TendRepository) MarkHeaderChecked(headerId int64) error {
-	_, err := r.DB.Exec(`INSERT INTO public.checked_headers (header_id, tend_checked)
+func (repository TendRepository) MarkHeaderChecked(headerId int64) error {
+	_, err := repository.db.Exec(`INSERT INTO public.checked_headers (header_id, tend_checked)
 		VALUES ($1, $2)
 	ON CONFLICT (header_id) DO
 		UPDATE SET tend_checked = $2`, headerId, true)
 	return err
 }
 
-func (r TendRepository) MissingHeaders(startingBlockNumber, endingBlockNumber int64) ([]core.Header, error) {
+func (repository TendRepository) MissingHeaders(startingBlockNumber, endingBlockNumber int64) ([]core.Header, error) {
 	var result []core.Header
-	err := r.DB.Select(
+	err := repository.db.Select(
 		&result,
 		`SELECT headers.id, headers.block_number FROM headers
-               LEFT JOIN checked_headers on headers.id = header_id
+				LEFT JOIN checked_headers on headers.id = header_id
                WHERE (header_id ISNULL OR tend_checked IS FALSE)
-               AND headers.block_number >= $1
-               AND headers.block_number <= $2
-               AND headers.eth_node_fingerprint = $3`,
+               	AND headers.block_number >= $1
+               	AND headers.block_number <= $2
+               	AND headers.eth_node_fingerprint = $3`,
 		startingBlockNumber,
 		endingBlockNumber,
-		r.DB.Node.ID,
+		repository.db.Node.ID,
 	)
 
 	return result, err
 }
+
+func (repository *TendRepository) SetDB(db *postgres.DB) {
+	repository.db = db
+}

pkg/transformers/tend/repository_test.go

@@ -17,6 +17,7 @@ package tend_test
 import (
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
+	"math/rand"
 
 	"github.com/vulcanize/vulcanizedb/pkg/core"
 	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
@@ -32,6 +33,7 @@ var _ = Describe("TendRepository", func() {
 		db               *postgres.DB
 		tendRepository   tend.TendRepository
 		headerRepository repositories.HeaderRepository
+		headerId         int64
 		err              error
 	)
 
@@ -40,17 +42,16 @@ var _ = Describe("TendRepository", func() {
 		db = test_config.NewTestDB(node)
 		test_config.CleanTestDB(db)
 		headerRepository = repositories.NewHeaderRepository(db)
-		tendRepository = tend.NewTendRepository(db)
+		tendRepository = tend.TendRepository{}
+		tendRepository.SetDB(db)
 	})
 
 	Describe("Create", func() {
-		var headerId int64
-
 		BeforeEach(func() {
 			headerId, err = headerRepository.CreateOrUpdateHeader(fakes.FakeHeader)
 			Expect(err).NotTo(HaveOccurred())
 
-			err := tendRepository.Create(headerId, []tend.TendModel{test_data.TendModel})
+			err = tendRepository.Create(headerId, []interface{}{test_data.TendModel})
 			Expect(err).NotTo(HaveOccurred())
 		})
 
@@ -81,8 +82,7 @@ var _ = Describe("TendRepository", func() {
 		})
 
 		It("returns an error if inserting a tend record fails", func() {
-			err = tendRepository.Create(headerId, []tend.TendModel{test_data.TendModel})
-
+			err = tendRepository.Create(headerId, []interface{}{test_data.TendModel})
 			Expect(err).To(HaveOccurred())
 			Expect(err.Error()).To(ContainSubstring("pq: duplicate key value violates unique constraint"))
 		})
@@ -100,11 +100,15 @@ var _ = Describe("TendRepository", func() {
 			Expect(err).NotTo(HaveOccurred())
 			Expect(count).To(Equal(0))
 		})
+
+		It("Returns an error if model is of wrong type", func() {
+			err = tendRepository.Create(headerId, []interface{}{test_data.WrongModel{}})
+			Expect(err).To(HaveOccurred())
+			Expect(err.Error()).To(ContainSubstring("model of type"))
+		})
 	})
 
 	Describe("MarkHeaderChecked", func() {
-		var headerId int64
-
 		BeforeEach(func() {
 			headerId, err = headerRepository.CreateOrUpdateHeader(fakes.FakeHeader)
 			Expect(err).NotTo(HaveOccurred())
@@ -140,7 +144,7 @@ var _ = Describe("TendRepository", func() {
 		)
 
 		BeforeEach(func() {
-			tendBlock = GinkgoRandomSeed()
+			tendBlock = rand.Int63()
 			startingBlock = tendBlock - 1
 			endingBlock = tendBlock + 1
 			outOfRangeBlock = tendBlock + 2
@@ -182,7 +186,8 @@ var _ = Describe("TendRepository", func() {
 			node2 := core.Node{}
 			db2 := test_config.NewTestDB(node2)
 			headerRepository2 := repositories.NewHeaderRepository(db2)
-			tendRepository2 := tend.NewTendRepository(db2)
+			tendRepository2 := tend.TendRepository{}
+			tendRepository2.SetDB(db2)
 
 			for _, number := range []int64{startingBlock, tendBlock, endingBlock} {
 				headerRepository2.CreateOrUpdateHeader(fakes.GetFakeHeader(number))

pkg/transformers/tend/transformer.go

@@ -1,88 +0,0 @@
-// Copyright 2018 Vulcanize
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package tend
-
-import (
-	"log"
-
-	"github.com/ethereum/go-ethereum/common"
-
-	"github.com/vulcanize/vulcanizedb/pkg/core"
-	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
-)
-
-type TendTransformer struct {
-	Repository Repository
-	Fetcher    shared.LogFetcher
-	Converter  Converter
-	Config     shared.TransformerConfig
-}
-
-type TendTransformerInitializer struct {
-	Config shared.TransformerConfig
-}
-
-func (i TendTransformerInitializer) NewTendTransformer(db *postgres.DB, blockChain core.BlockChain) shared.Transformer {
-	converter := NewTendConverter()
-	fetcher := shared.NewFetcher(blockChain)
-	repository := NewTendRepository(db)
-	return TendTransformer{
-		Fetcher:    fetcher,
-		Repository: repository,
-		Converter:  converter,
-		Config:     i.Config,
-	}
-}
-
-func (t TendTransformer) Execute() error {
-	config := t.Config
-	topics := [][]common.Hash{{common.HexToHash(shared.TendFunctionSignature)}}
-
-	missingHeaders, err := t.Repository.MissingHeaders(config.StartingBlockNumber, config.EndingBlockNumber)
-	if err != nil {
-		log.Println("Error fetching missing headers:", err)
-		return err
-	}
-
-	log.Printf("Fetching tend event logs for %d headers \n", len(missingHeaders))
-	for _, header := range missingHeaders {
-		ethLogs, err := t.Fetcher.FetchLogs(config.ContractAddresses, topics, header.BlockNumber)
-		if err != nil {
-			log.Println("Error fetching matching logs:", err)
-			return err
-		}
-		if len(ethLogs) < 1 {
-			err := t.Repository.MarkHeaderChecked(header.Id)
-			if err != nil {
-				return err
-			}
-		}
-
-		models, err := t.Converter.ToModels(ethLogs)
-		if err != nil {
-			log.Println("Error converting logs:", err)
-			return err
-		}
-
-		err = t.Repository.Create(header.Id, models)
-		if err != nil {
-			log.Println("Error persisting tend record:", err)
-			return err
-		}
-	}
-
-	return nil
-}

pkg/transformers/tend/transformer_test.go

@@ -15,6 +15,7 @@
 package tend_test
 
 import (
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/factories"
 	"math/rand"
 
 	"github.com/ethereum/go-ethereum/common"
@@ -32,24 +33,33 @@ import (
 )
 
 var _ = Describe("Tend Transformer", func() {
-	var repository tend_mocks.MockTendRepository
-	var fetcher mocks.MockLogFetcher
-	var converter tend_mocks.MockTendConverter
-	var transformer tend.TendTransformer
-	var blockNumber1 = rand.Int63()
-	var blockNumber2 = rand.Int63()
+	var (
+		config      = tend.TendConfig
+		converter   tend_mocks.MockTendConverter
+		repository  tend_mocks.MockTendRepository
+		fetcher     mocks.MockLogFetcher
+		transformer shared.Transformer
+		headerOne   core.Header
+		headerTwo   core.Header
+	)
 
 	BeforeEach(func() {
+		converter = tend_mocks.MockTendConverter{}
 		repository = tend_mocks.MockTendRepository{}
 		fetcher = mocks.MockLogFetcher{}
-		converter = tend_mocks.MockTendConverter{}
-
-		transformer = tend.TendTransformer{
-			Repository: &repository,
+		headerOne = core.Header{Id: rand.Int63(), BlockNumber: rand.Int63()}
+		headerTwo = core.Header{Id: rand.Int63(), BlockNumber: rand.Int63()}
+		transformer = factories.Transformer{
+			Config:     config,
 			Fetcher:    &fetcher,
 			Converter:  &converter,
-			Config:     tend.TendConfig,
-		}
+			Repository: &repository,
+		}.NewTransformer(nil, nil)
+	})
+
+	It("sets the blockchain and database", func() {
+		Expect(fetcher.SetBcCalled).To(BeTrue())
+		Expect(repository.SetDbCalled).To(BeTrue())
 	})
 
 	It("gets missing headers for blocks in the configured range", func() {
@@ -68,12 +78,12 @@ var _ = Describe("Tend Transformer", func() {
 	})
 
 	It("fetches eth logs for each missing header", func() {
-		repository.SetMissingHeaders([]core.Header{{BlockNumber: blockNumber1}, {BlockNumber: blockNumber2}})
+		repository.SetMissingHeaders([]core.Header{headerOne, headerTwo})
 		expectedTopics := [][]common.Hash{{common.HexToHash(shared.TendFunctionSignature)}}
 		err := transformer.Execute()
 
 		Expect(err).NotTo(HaveOccurred())
-		Expect(fetcher.FetchedBlocks).To(Equal([]int64{blockNumber1, blockNumber2}))
+		Expect(fetcher.FetchedBlocks).To(Equal([]int64{headerOne.BlockNumber, headerTwo.BlockNumber}))
 		Expect(fetcher.FetchedTopics).To(Equal(expectedTopics))
 		Expect(fetcher.FetchedContractAddresses).To(Equal([][]string{tend.TendConfig.ContractAddresses, tend.TendConfig.ContractAddresses}))
 	})
@@ -88,34 +98,17 @@ var _ = Describe("Tend Transformer", func() {
 	})
 
 	It("marks header checked if no logs returned", func() {
-		mockConverter := &tend_mocks.MockTendConverter{}
-		mockRepository := &tend_mocks.MockTendRepository{}
-		headerID := int64(123)
-		mockRepository.SetMissingHeaders([]core.Header{{Id: headerID}})
-		mockFetcher := &mocks.MockLogFetcher{}
-		transformer := tend.TendTransformer{
-			Converter:  mockConverter,
-			Fetcher:    mockFetcher,
-			Repository: mockRepository,
-		}
+		repository.SetMissingHeaders([]core.Header{headerOne})
 
 		err := transformer.Execute()
 
 		Expect(err).NotTo(HaveOccurred())
-		mockRepository.AssertMarkHeaderCheckedCalledWith(headerID)
+		repository.AssertMarkHeaderCheckedCalledWith(headerOne.Id)
 	})
 
 	It("returns error if marking header checked returns err", func() {
-		mockConverter := &tend_mocks.MockTendConverter{}
-		mockRepository := &tend_mocks.MockTendRepository{}
-		mockRepository.SetMissingHeaders([]core.Header{{Id: int64(123)}})
-		mockRepository.SetMarkHeaderCheckedErr(fakes.FakeError)
-		mockFetcher := &mocks.MockLogFetcher{}
-		transformer := tend.TendTransformer{
-			Converter:  mockConverter,
-			Fetcher:    mockFetcher,
-			Repository: mockRepository,
-		}
+		repository.SetMissingHeaders([]core.Header{headerOne})
+		repository.SetMarkHeaderCheckedErr(fakes.FakeError)
 
 		err := transformer.Execute()
 
@@ -124,37 +117,37 @@ var _ = Describe("Tend Transformer", func() {
 	})
 
 	It("converts an eth log to a Model", func() {
-		repository.SetMissingHeaders([]core.Header{{BlockNumber: 1}})
+		repository.SetMissingHeaders([]core.Header{headerOne})
 		fetcher.SetFetchedLogs([]types.Log{test_data.TendLogNote})
 		err := transformer.Execute()
 
 		Expect(err).NotTo(HaveOccurred())
-		Expect(converter.LogsToConvert).To(Equal([]types.Log{test_data.TendLogNote}))
+		Expect(converter.PassedLogs).To(Equal([]types.Log{test_data.TendLogNote}))
 	})
 
 	It("returns an error if converter fails", func() {
-		repository.SetMissingHeaders([]core.Header{{BlockNumber: 1}})
+		repository.SetMissingHeaders([]core.Header{headerOne})
 		fetcher.SetFetchedLogs([]types.Log{test_data.TendLogNote})
 		converter.SetConverterError(fakes.FakeError)
 		err := transformer.Execute()
+
 		Expect(err).To(HaveOccurred())
 		Expect(err).To(MatchError(fakes.FakeError))
 	})
 
 	It("persists the tend record", func() {
-		headerId := int64(1)
-		repository.SetMissingHeaders([]core.Header{{BlockNumber: blockNumber1, Id: headerId}})
+		repository.SetMissingHeaders([]core.Header{headerOne})
 		fetcher.SetFetchedLogs([]types.Log{test_data.TendLogNote})
 
 		err := transformer.Execute()
 
 		Expect(err).NotTo(HaveOccurred())
-		Expect(repository.PassedHeaderID).To(Equal(headerId))
+		Expect(repository.PassedHeaderID).To(Equal(headerOne.Id))
 		Expect(repository.PassedTendModel).To(Equal(test_data.TendModel))
 	})
 
 	It("returns error if persisting tend record fails", func() {
-		repository.SetMissingHeaders([]core.Header{{BlockNumber: blockNumber1}})
+		repository.SetMissingHeaders([]core.Header{headerOne})
 		fetcher.SetFetchedLogs([]types.Log{test_data.TendLogNote})
 		repository.SetCreateError(fakes.FakeError)
 		err := transformer.Execute()

pkg/transformers/test_data/mocks/drip_file/ilk/converter.go

@@ -16,20 +16,19 @@ package ilk
 
 import (
 	"github.com/ethereum/go-ethereum/core/types"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/drip_file/ilk"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/test_data"
 )
 
 type MockDripFileIlkConverter struct {
-	converterErr error
-	PassedLogs   []types.Log
+	converterError error
+	PassedLogs     []types.Log
 }
 
-func (converter *MockDripFileIlkConverter) ToModels(ethLogs []types.Log) ([]ilk.DripFileIlkModel, error) {
+func (converter *MockDripFileIlkConverter) ToModels(ethLogs []types.Log) ([]interface{}, error) {
 	converter.PassedLogs = ethLogs
-	return []ilk.DripFileIlkModel{test_data.DripFileIlkModel}, converter.converterErr
+	return []interface{}{test_data.DripFileIlkModel}, converter.converterError
 }
 
 func (converter *MockDripFileIlkConverter) SetConverterError(e error) {
-	converter.converterErr = e
+	converter.converterError = e
 }

pkg/transformers/test_data/mocks/drip_file/ilk/repository.go

@@ -16,46 +16,47 @@ package ilk
 
 import (
 	. "github.com/onsi/gomega"
+	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
 
 	"github.com/vulcanize/vulcanizedb/pkg/core"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/drip_file/ilk"
 )
 
 type MockDripFileIlkRepository struct {
-	createErr                       error
-	markHeaderCheckedErr            error
+	createError                     error
+	markHeaderCheckedError          error
 	markHeaderCheckedPassedHeaderID int64
 	missingHeaders                  []core.Header
-	missingHeadersErr               error
+	missingHeadersError             error
 	PassedStartingBlockNumber       int64
 	PassedEndingBlockNumber         int64
 	PassedHeaderID                  int64
-	PassedModels                    []ilk.DripFileIlkModel
+	PassedModels                    []interface{}
+	SetDbCalled                     bool
 }
 
-func (repository *MockDripFileIlkRepository) Create(headerID int64, models []ilk.DripFileIlkModel) error {
+func (repository *MockDripFileIlkRepository) Create(headerID int64, models []interface{}) error {
 	repository.PassedHeaderID = headerID
 	repository.PassedModels = models
-	return repository.createErr
+	return repository.createError
 }
 
 func (repository *MockDripFileIlkRepository) MarkHeaderChecked(headerID int64) error {
 	repository.markHeaderCheckedPassedHeaderID = headerID
-	return repository.markHeaderCheckedErr
+	return repository.markHeaderCheckedError
 }
 
 func (repository *MockDripFileIlkRepository) MissingHeaders(startingBlockNumber, endingBlockNumber int64) ([]core.Header, error) {
 	repository.PassedStartingBlockNumber = startingBlockNumber
 	repository.PassedEndingBlockNumber = endingBlockNumber
-	return repository.missingHeaders, repository.missingHeadersErr
+	return repository.missingHeaders, repository.missingHeadersError
 }
 
-func (repository *MockDripFileIlkRepository) SetMarkHeaderCheckedErr(e error) {
-	repository.markHeaderCheckedErr = e
+func (repository *MockDripFileIlkRepository) SetMarkHeaderCheckedError(e error) {
+	repository.markHeaderCheckedError = e
 }
 
-func (repository *MockDripFileIlkRepository) SetMissingHeadersErr(e error) {
-	repository.missingHeadersErr = e
+func (repository *MockDripFileIlkRepository) SetMissingHeadersError(e error) {
+	repository.missingHeadersError = e
 }
 
 func (repository *MockDripFileIlkRepository) SetMissingHeaders(headers []core.Header) {
@@ -63,8 +64,12 @@ func (repository *MockDripFileIlkRepository) SetMissingHeaders(headers []core.He
 }
 
 func (repository *MockDripFileIlkRepository) SetCreateError(e error) {
-	repository.createErr = e
+	repository.createError = e
 }
 func (repository *MockDripFileIlkRepository) AssertMarkHeaderCheckedCalledWith(i int64) {
 	Expect(repository.markHeaderCheckedPassedHeaderID).To(Equal(i))
 }
+
+func (repository *MockDripFileIlkRepository) SetDB(db *postgres.DB) {
+	repository.SetDbCalled = true
+}

pkg/transformers/test_data/mocks/drip_file/repo/converter.go

@@ -16,20 +16,19 @@ package repo
 
 import (
 	"github.com/ethereum/go-ethereum/core/types"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/drip_file/repo"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/test_data"
 )
 
 type MockDripFileRepoConverter struct {
-	converterErr error
-	PassedLogs   []types.Log
+	converterError error
+	PassedLogs     []types.Log
 }
 
-func (converter *MockDripFileRepoConverter) ToModels(ethLogs []types.Log) ([]repo.DripFileRepoModel, error) {
+func (converter *MockDripFileRepoConverter) ToModels(ethLogs []types.Log) ([]interface{}, error) {
 	converter.PassedLogs = ethLogs
-	return []repo.DripFileRepoModel{test_data.DripFileRepoModel}, converter.converterErr
+	return []interface{}{test_data.DripFileRepoModel}, converter.converterError
 }
 
 func (converter *MockDripFileRepoConverter) SetConverterError(e error) {
-	converter.converterErr = e
+	converter.converterError = e
 }

pkg/transformers/test_data/mocks/drip_file/repo/repository.go

@@ -16,46 +16,47 @@ package repo
 
 import (
 	. "github.com/onsi/gomega"
+	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
 
 	"github.com/vulcanize/vulcanizedb/pkg/core"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/drip_file/repo"
 )
 
 type MockDripFileRepoRepository struct {
-	createErr                       error
-	markHeaderCheckedErr            error
+	createError                     error
+	markHeaderCheckedError          error
 	markHeaderCheckedPassedHeaderID int64
 	missingHeaders                  []core.Header
-	missingHeadersErr               error
+	missingHeadersError             error
 	PassedStartingBlockNumber       int64
 	PassedEndingBlockNumber         int64
 	PassedHeaderID                  int64
-	PassedModels                    []repo.DripFileRepoModel
+	PassedModels                    []interface{}
+	SetDbCalled                     bool
 }
 
-func (repository *MockDripFileRepoRepository) Create(headerID int64, models []repo.DripFileRepoModel) error {
+func (repository *MockDripFileRepoRepository) Create(headerID int64, models []interface{}) error {
 	repository.PassedHeaderID = headerID
 	repository.PassedModels = models
-	return repository.createErr
+	return repository.createError
 }
 
 func (repository *MockDripFileRepoRepository) MarkHeaderChecked(headerID int64) error {
 	repository.markHeaderCheckedPassedHeaderID = headerID
-	return repository.markHeaderCheckedErr
+	return repository.markHeaderCheckedError
 }
 
 func (repository *MockDripFileRepoRepository) MissingHeaders(startingBlockNumber, endingBlockNumber int64) ([]core.Header, error) {
 	repository.PassedStartingBlockNumber = startingBlockNumber
 	repository.PassedEndingBlockNumber = endingBlockNumber
-	return repository.missingHeaders, repository.missingHeadersErr
+	return repository.missingHeaders, repository.missingHeadersError
 }
 
-func (repository *MockDripFileRepoRepository) SetMarkHeaderCheckedErr(e error) {
-	repository.markHeaderCheckedErr = e
+func (repository *MockDripFileRepoRepository) SetMarkHeaderCheckedError(e error) {
+	repository.markHeaderCheckedError = e
 }
 
-func (repository *MockDripFileRepoRepository) SetMissingHeadersErr(e error) {
-	repository.missingHeadersErr = e
+func (repository *MockDripFileRepoRepository) SetMissingHeadersError(e error) {
+	repository.missingHeadersError = e
 }
 
 func (repository *MockDripFileRepoRepository) SetMissingHeaders(headers []core.Header) {
@@ -63,8 +64,13 @@ func (repository *MockDripFileRepoRepository) SetMissingHeaders(headers []core.H
 }
 
 func (repository *MockDripFileRepoRepository) SetCreateError(e error) {
-	repository.createErr = e
+	repository.createError = e
 }
+
 func (repository *MockDripFileRepoRepository) AssertMarkHeaderCheckedCalledWith(i int64) {
 	Expect(repository.markHeaderCheckedPassedHeaderID).To(Equal(i))
 }
+
+func (repository *MockDripFileRepoRepository) SetDB(db *postgres.DB) {
+	repository.SetDbCalled = true
+}

pkg/transformers/test_data/mocks/drip_file/vow/converter.go

@@ -16,7 +16,6 @@ package vow
 
 import (
 	"github.com/ethereum/go-ethereum/core/types"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/drip_file/vow"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/test_data"
 )
 
@@ -25,9 +24,9 @@ type MockDripFileVowConverter struct {
 	PassedLogs   []types.Log
 }
 
-func (converter *MockDripFileVowConverter) ToModels(ethLogs []types.Log) ([]vow.DripFileVowModel, error) {
+func (converter *MockDripFileVowConverter) ToModels(ethLogs []types.Log) ([]interface{}, error) {
 	converter.PassedLogs = ethLogs
-	return []vow.DripFileVowModel{test_data.DripFileVowModel}, converter.converterErr
+	return []interface{}{test_data.DripFileVowModel}, converter.converterErr
 }
 
 func (converter *MockDripFileVowConverter) SetConverterError(e error) {

pkg/transformers/test_data/mocks/drip_file/vow/repository.go

@@ -16,46 +16,47 @@ package vow
 
 import (
 	. "github.com/onsi/gomega"
+	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
 
 	"github.com/vulcanize/vulcanizedb/pkg/core"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/drip_file/vow"
 )
 
 type MockDripFileVowRepository struct {
-	createErr                       error
-	markHeaderCheckedErr            error
+	createError                     error
+	markHeaderCheckedError          error
 	markHeaderCheckedPassedHeaderID int64
 	missingHeaders                  []core.Header
-	missingHeadersErr               error
+	missingHeadersError             error
 	PassedStartingBlockNumber       int64
 	PassedEndingBlockNumber         int64
 	PassedHeaderID                  int64
-	PassedModels                    []vow.DripFileVowModel
+	PassedModels                    []interface{}
+	SetDbCalled                     bool
 }
 
-func (repository *MockDripFileVowRepository) Create(headerID int64, models []vow.DripFileVowModel) error {
+func (repository *MockDripFileVowRepository) Create(headerID int64, models []interface{}) error {
 	repository.PassedHeaderID = headerID
 	repository.PassedModels = models
-	return repository.createErr
+	return repository.createError
 }
 
 func (repository *MockDripFileVowRepository) MarkHeaderChecked(headerID int64) error {
 	repository.markHeaderCheckedPassedHeaderID = headerID
-	return repository.markHeaderCheckedErr
+	return repository.markHeaderCheckedError
 }
 
 func (repository *MockDripFileVowRepository) MissingHeaders(startingBlockNumber, endingBlockNumber int64) ([]core.Header, error) {
 	repository.PassedStartingBlockNumber = startingBlockNumber
 	repository.PassedEndingBlockNumber = endingBlockNumber
-	return repository.missingHeaders, repository.missingHeadersErr
+	return repository.missingHeaders, repository.missingHeadersError
 }
 
-func (repository *MockDripFileVowRepository) SetMarkHeaderCheckedErr(e error) {
-	repository.markHeaderCheckedErr = e
+func (repository *MockDripFileVowRepository) SetMarkHeaderCheckedError(e error) {
+	repository.markHeaderCheckedError = e
 }
 
-func (repository *MockDripFileVowRepository) SetMissingHeadersErr(e error) {
-	repository.missingHeadersErr = e
+func (repository *MockDripFileVowRepository) SetMissingHeadersError(e error) {
+	repository.missingHeadersError = e
 }
 
 func (repository *MockDripFileVowRepository) SetMissingHeaders(headers []core.Header) {
@@ -63,8 +64,12 @@ func (repository *MockDripFileVowRepository) SetMissingHeaders(headers []core.He
 }
 
 func (repository *MockDripFileVowRepository) SetCreateError(e error) {
-	repository.createErr = e
+	repository.createError = e
 }
 func (repository *MockDripFileVowRepository) AssertMarkHeaderCheckedCalledWith(i int64) {
 	Expect(repository.markHeaderCheckedPassedHeaderID).To(Equal(i))
 }
+
+func (repository *MockDripFileVowRepository) SetDB(db *postgres.DB) {
+	repository.SetDbCalled = true
+}

pkg/transformers/test_data/mocks/log_fetcher.go

@@ -17,6 +17,7 @@ package mocks
 import (
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/vulcanize/vulcanizedb/pkg/core"
 )
 
 type MockLogFetcher struct {
@@ -25,6 +26,7 @@ type MockLogFetcher struct {
 	FetchedBlocks            []int64
 	fetcherError             error
 	FetchedLogs              []types.Log
+	SetBcCalled              bool
 }
 
 func (mlf *MockLogFetcher) FetchLogs(contractAddresses []string, topics [][]common.Hash, blockNumber int64) ([]types.Log, error) {
@@ -35,6 +37,10 @@ func (mlf *MockLogFetcher) FetchLogs(contractAddresses []string, topics [][]comm
 	return mlf.FetchedLogs, mlf.fetcherError
 }
 
+func (mlf *MockLogFetcher) SetBC(bc core.BlockChain) {
+	mlf.SetBcCalled = true
+}
+
 func (mlf *MockLogFetcher) SetFetcherError(err error) {
 	mlf.fetcherError = err
 }

pkg/transformers/test_data/mocks/pit_file/debt_ceiling/converter.go

@@ -17,20 +17,19 @@ package debt_ceiling
 import (
 	"github.com/ethereum/go-ethereum/core/types"
 
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/pit_file/debt_ceiling"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/test_data"
 )
 
 type MockPitFileDebtCeilingConverter struct {
-	converterErr error
-	PassedLogs   []types.Log
+	converterError error
+	PassedLogs     []types.Log
 }
 
-func (converter *MockPitFileDebtCeilingConverter) ToModels(ethLogs []types.Log) ([]debt_ceiling.PitFileDebtCeilingModel, error) {
+func (converter *MockPitFileDebtCeilingConverter) ToModels(ethLogs []types.Log) ([]interface{}, error) {
 	converter.PassedLogs = ethLogs
-	return []debt_ceiling.PitFileDebtCeilingModel{test_data.PitFileDebtCeilingModel}, converter.converterErr
+	return []interface{}{test_data.PitFileDebtCeilingModel}, converter.converterError
 }
 
 func (converter *MockPitFileDebtCeilingConverter) SetConverterError(e error) {
-	converter.converterErr = e
+	converter.converterError = e
 }

pkg/transformers/test_data/mocks/pit_file/debt_ceiling/repository.go

@@ -16,46 +16,47 @@ package debt_ceiling
 
 import (
 	. "github.com/onsi/gomega"
+	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
 
 	"github.com/vulcanize/vulcanizedb/pkg/core"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/pit_file/debt_ceiling"
 )
 
 type MockPitFileDebtCeilingRepository struct {
-	createErr                       error
-	markHeaderCheckedErr            error
+	createError                     error
+	markHeaderCheckedError          error
 	markHeaderCheckedPassedHeaderID int64
 	missingHeaders                  []core.Header
-	missingHeadersErr               error
+	missingHeadersError             error
 	PassedStartingBlockNumber       int64
 	PassedEndingBlockNumber         int64
 	PassedHeaderID                  int64
-	PassedModels                    []debt_ceiling.PitFileDebtCeilingModel
+	PassedModels                    []interface{}
+	SetDbCalled                     bool
 }
 
 func (repository *MockPitFileDebtCeilingRepository) MarkHeaderChecked(headerID int64) error {
 	repository.markHeaderCheckedPassedHeaderID = headerID
-	return repository.markHeaderCheckedErr
+	return repository.markHeaderCheckedError
 }
 
-func (repository *MockPitFileDebtCeilingRepository) Create(headerID int64, models []debt_ceiling.PitFileDebtCeilingModel) error {
+func (repository *MockPitFileDebtCeilingRepository) Create(headerID int64, models []interface{}) error {
 	repository.PassedHeaderID = headerID
 	repository.PassedModels = models
-	return repository.createErr
+	return repository.createError
 }
 
 func (repository *MockPitFileDebtCeilingRepository) MissingHeaders(startingBlockNumber, endingBlockNumber int64) ([]core.Header, error) {
 	repository.PassedStartingBlockNumber = startingBlockNumber
 	repository.PassedEndingBlockNumber = endingBlockNumber
-	return repository.missingHeaders, repository.missingHeadersErr
+	return repository.missingHeaders, repository.missingHeadersError
 }
 
-func (repository *MockPitFileDebtCeilingRepository) SetMarkHeaderCheckedErr(e error) {
-	repository.markHeaderCheckedErr = e
+func (repository *MockPitFileDebtCeilingRepository) SetMarkHeaderCheckedError(e error) {
+	repository.markHeaderCheckedError = e
 }
 
-func (repository *MockPitFileDebtCeilingRepository) SetMissingHeadersErr(e error) {
-	repository.missingHeadersErr = e
+func (repository *MockPitFileDebtCeilingRepository) SetMissingHeadersError(e error) {
+	repository.missingHeadersError = e
 }
 
 func (repository *MockPitFileDebtCeilingRepository) SetMissingHeaders(headers []core.Header) {
@@ -63,9 +64,13 @@ func (repository *MockPitFileDebtCeilingRepository) SetMissingHeaders(headers []
 }
 
 func (repository *MockPitFileDebtCeilingRepository) SetCreateError(e error) {
-	repository.createErr = e
+	repository.createError = e
 }
 
 func (repository *MockPitFileDebtCeilingRepository) AssertMarkHeaderCheckedCalledWith(i int64) {
 	Expect(repository.markHeaderCheckedPassedHeaderID).To(Equal(i))
 }
+
+func (repository *MockPitFileDebtCeilingRepository) SetDB(db *postgres.DB) {
+	repository.SetDbCalled = true
+}

pkg/transformers/test_data/mocks/pit_file/ilk/converter.go

@@ -17,7 +17,6 @@ package ilk
 import (
 	"github.com/ethereum/go-ethereum/core/types"
 
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/pit_file/ilk"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/test_data"
 )
 
@@ -30,7 +29,7 @@ func (converter *MockPitFileIlkConverter) SetConverterError(err error) {
 	converter.converterError = err
 }
 
-func (converter *MockPitFileIlkConverter) ToModels(ethLogs []types.Log) ([]ilk.PitFileIlkModel, error) {
+func (converter *MockPitFileIlkConverter) ToModels(ethLogs []types.Log) ([]interface{}, error) {
 	converter.PassedLogs = ethLogs
-	return []ilk.PitFileIlkModel{test_data.PitFileIlkModel}, converter.converterError
+	return []interface{}{test_data.PitFileIlkModel}, converter.converterError
 }

pkg/transformers/test_data/mocks/pit_file/ilk/repository.go

@@ -16,40 +16,41 @@ package ilk
 
 import (
 	. "github.com/onsi/gomega"
+	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
 
 	"github.com/vulcanize/vulcanizedb/pkg/core"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/pit_file/ilk"
 )
 
 type MockPitFileIlkRepository struct {
 	createError                     error
 	PassedEndingBlockNumber         int64
-	PassedModels                    []ilk.PitFileIlkModel
+	PassedModels                    []interface{}
 	PassedHeaderID                  int64
 	PassedStartingBlockNumber       int64
-	markHeaderCheckedErr            error
+	markHeaderCheckedError          error
 	markHeaderCheckedPassedHeaderID int64
 	missingHeaders                  []core.Header
-	missingHeadersErr               error
+	missingHeadersError             error
+	SetDbCalled                     bool
 }
 
 func (repository *MockPitFileIlkRepository) SetCreateError(err error) {
 	repository.createError = err
 }
 
-func (repository *MockPitFileIlkRepository) SetMarkHeaderCheckedErr(e error) {
-	repository.markHeaderCheckedErr = e
+func (repository *MockPitFileIlkRepository) SetMarkHeaderCheckedError(e error) {
+	repository.markHeaderCheckedError = e
 }
 
-func (repository *MockPitFileIlkRepository) SetMissingHeadersErr(err error) {
-	repository.missingHeadersErr = err
+func (repository *MockPitFileIlkRepository) SetMissingHeadersError(err error) {
+	repository.missingHeadersError = err
 }
 
 func (repository *MockPitFileIlkRepository) SetMissingHeaders(headers []core.Header) {
 	repository.missingHeaders = headers
 }
 
-func (repository *MockPitFileIlkRepository) Create(headerID int64, models []ilk.PitFileIlkModel) error {
+func (repository *MockPitFileIlkRepository) Create(headerID int64, models []interface{}) error {
 	repository.PassedHeaderID = headerID
 	repository.PassedModels = models
 	return repository.createError
@@ -57,15 +58,19 @@ func (repository *MockPitFileIlkRepository) Create(headerID int64, models []ilk.
 
 func (repository *MockPitFileIlkRepository) MarkHeaderChecked(headerID int64) error {
 	repository.markHeaderCheckedPassedHeaderID = headerID
-	return repository.markHeaderCheckedErr
+	return repository.markHeaderCheckedError
 }
 
 func (repository *MockPitFileIlkRepository) MissingHeaders(startingBlockNumber, endingBlockNumber int64) ([]core.Header, error) {
 	repository.PassedStartingBlockNumber = startingBlockNumber
 	repository.PassedEndingBlockNumber = endingBlockNumber
-	return repository.missingHeaders, repository.missingHeadersErr
+	return repository.missingHeaders, repository.missingHeadersError
 }
 
 func (repository *MockPitFileIlkRepository) AssertMarkHeaderCheckedCalledWith(i int64) {
 	Expect(repository.markHeaderCheckedPassedHeaderID).To(Equal(i))
 }
+
+func (repository *MockPitFileIlkRepository) SetDB(db *postgres.DB) {
+	repository.SetDbCalled = true
+}

pkg/transformers/test_data/mocks/pit_file/stability_fee/converter.go

@@ -17,20 +17,19 @@ package stability_fee
 import (
 	"github.com/ethereum/go-ethereum/core/types"
 
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/pit_file/stability_fee"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/test_data"
 )
 
 type MockPitFileStabilityFeeConverter struct {
-	converterErr error
-	PassedLogs   []types.Log
+	converterError error
+	PassedLogs     []types.Log
 }
 
-func (converter *MockPitFileStabilityFeeConverter) ToModels(ethLogs []types.Log) ([]stability_fee.PitFileStabilityFeeModel, error) {
+func (converter *MockPitFileStabilityFeeConverter) ToModels(ethLogs []types.Log) ([]interface{}, error) {
 	converter.PassedLogs = ethLogs
-	return []stability_fee.PitFileStabilityFeeModel{test_data.PitFileStabilityFeeModel}, converter.converterErr
+	return []interface{}{test_data.PitFileStabilityFeeModel}, converter.converterError
 }
 
 func (converter *MockPitFileStabilityFeeConverter) SetConverterError(e error) {
-	converter.converterErr = e
+	converter.converterError = e
 }

pkg/transformers/test_data/mocks/pit_file/stability_fee/repository.go

@@ -16,46 +16,47 @@ package stability_fee
 
 import (
 	. "github.com/onsi/gomega"
+	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
 
 	"github.com/vulcanize/vulcanizedb/pkg/core"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/pit_file/stability_fee"
 )
 
 type MockPitFileStabilityFeeRepository struct {
-	createErr                       error
-	markHeaderCheckedErr            error
+	createError                     error
+	markHeaderCheckedError          error
 	markHeaderCheckedPassedHeaderID int64
 	missingHeaders                  []core.Header
-	missingHeadersErr               error
+	missingHeadersError             error
 	PassedStartingBlockNumber       int64
 	PassedEndingBlockNumber         int64
 	PassedHeaderID                  int64
-	PassedModels                    []stability_fee.PitFileStabilityFeeModel
+	PassedModels                    []interface{}
+	SetDbCalled                     bool
 }
 
-func (repository *MockPitFileStabilityFeeRepository) Create(headerID int64, models []stability_fee.PitFileStabilityFeeModel) error {
+func (repository *MockPitFileStabilityFeeRepository) Create(headerID int64, models []interface{}) error {
 	repository.PassedModels = models
 	repository.PassedHeaderID = headerID
-	return repository.createErr
+	return repository.createError
 }
 
 func (repository *MockPitFileStabilityFeeRepository) MarkHeaderChecked(headerID int64) error {
 	repository.markHeaderCheckedPassedHeaderID = headerID
-	return repository.markHeaderCheckedErr
+	return repository.markHeaderCheckedError
 }
 
 func (repository *MockPitFileStabilityFeeRepository) MissingHeaders(startingBlockNumber, endingBlockNumber int64) ([]core.Header, error) {
 	repository.PassedStartingBlockNumber = startingBlockNumber
 	repository.PassedEndingBlockNumber = endingBlockNumber
-	return repository.missingHeaders, repository.missingHeadersErr
+	return repository.missingHeaders, repository.missingHeadersError
 }
 
 func (repository *MockPitFileStabilityFeeRepository) SetMarkHeaderCheckedErr(e error) {
-	repository.markHeaderCheckedErr = e
+	repository.markHeaderCheckedError = e
 }
 
 func (repository *MockPitFileStabilityFeeRepository) SetMissingHeadersErr(e error) {
-	repository.missingHeadersErr = e
+	repository.missingHeadersError = e
 }
 
 func (repository *MockPitFileStabilityFeeRepository) SetMissingHeaders(headers []core.Header) {
@@ -63,9 +64,13 @@ func (repository *MockPitFileStabilityFeeRepository) SetMissingHeaders(headers [
 }
 
 func (repository *MockPitFileStabilityFeeRepository) SetCreateError(e error) {
-	repository.createErr = e
+	repository.createError = e
 }
 
 func (repository *MockPitFileStabilityFeeRepository) AssertMarkHeaderCheckedCalledWith(i int64) {
 	Expect(repository.markHeaderCheckedPassedHeaderID).To(Equal(i))
 }
+
+func (repository *MockPitFileStabilityFeeRepository) SetDB(db *postgres.DB) {
+	repository.SetDbCalled = true
+}

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

@@ -17,20 +17,19 @@ package tend
 import (
 	"github.com/ethereum/go-ethereum/core/types"
 
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/tend"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/test_data"
 )
 
 type MockTendConverter struct {
-	LogsToConvert  []types.Log
+	PassedLogs     []types.Log
 	ConverterError error
 }
 
-func (c *MockTendConverter) ToModels(ethLogs []types.Log) ([]tend.TendModel, error) {
-	c.LogsToConvert = append(c.LogsToConvert, ethLogs...)
-	return []tend.TendModel{test_data.TendModel}, c.ConverterError
+func (converter *MockTendConverter) ToModels(ethLogs []types.Log) ([]interface{}, error) {
+	converter.PassedLogs = ethLogs
+	return []interface{}{test_data.TendModel}, converter.ConverterError
 }
 
-func (c *MockTendConverter) SetConverterError(err error) {
-	c.ConverterError = err
+func (converter *MockTendConverter) SetConverterError(err error) {
+	converter.ConverterError = err
 }

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

@@ -16,9 +16,9 @@ package tend
 
 import (
 	. "github.com/onsi/gomega"
+	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
 
 	"github.com/vulcanize/vulcanizedb/pkg/core"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/tend"
 )
 
 type MockTendRepository struct {
@@ -26,14 +26,15 @@ type MockTendRepository struct {
 	PassedEndingBlockNumber         int64
 	PassedHeaderID                  int64
 	PassedStartingBlockNumber       int64
-	PassedTendModel                 tend.TendModel
-	markHeaderCheckedErr            error
+	PassedTendModel                 interface{}
+	markHeaderCheckedError          error
 	markHeaderCheckedPassedHeaderId int64
 	missingHeaders                  []core.Header
-	missingHeadersErr               error
+	missingHeadersError             error
+	SetDbCalled                     bool
 }
 
-func (repository *MockTendRepository) Create(headerId int64, tend []tend.TendModel) error {
+func (repository *MockTendRepository) Create(headerId int64, tend []interface{}) error {
 	repository.PassedHeaderID = headerId
 	repository.PassedTendModel = tend[0]
 	return repository.createError
@@ -44,11 +45,11 @@ func (repository *MockTendRepository) SetCreateError(err error) {
 }
 
 func (repository *MockTendRepository) SetMarkHeaderCheckedErr(err error) {
-	repository.markHeaderCheckedErr = err
+	repository.markHeaderCheckedError = err
 }
 
 func (repository *MockTendRepository) SetMissingHeadersErr(err error) {
-	repository.missingHeadersErr = err
+	repository.missingHeadersError = err
 }
 
 func (repository *MockTendRepository) SetMissingHeaders(headers []core.Header) {
@@ -57,15 +58,19 @@ func (repository *MockTendRepository) SetMissingHeaders(headers []core.Header) {
 
 func (repository *MockTendRepository) MarkHeaderChecked(headerId int64) error {
 	repository.markHeaderCheckedPassedHeaderId = headerId
-	return repository.markHeaderCheckedErr
+	return repository.markHeaderCheckedError
 }
 
 func (repository *MockTendRepository) MissingHeaders(startingBlockNumber, endingBlockNumber int64) ([]core.Header, error) {
 	repository.PassedStartingBlockNumber = startingBlockNumber
 	repository.PassedEndingBlockNumber = endingBlockNumber
-	return repository.missingHeaders, repository.missingHeadersErr
+	return repository.missingHeaders, repository.missingHeadersError
 }
 
 func (repository *MockTendRepository) AssertMarkHeaderCheckedCalledWith(headerId int64) {
 	Expect(repository.markHeaderCheckedPassedHeaderId).To(Equal(headerId))
 }
+
+func (repository *MockTendRepository) SetDB(db *postgres.DB) {
+	repository.SetDbCalled = true
+}

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

@@ -18,19 +18,18 @@ import (
 	"github.com/ethereum/go-ethereum/core/types"
 
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/test_data"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/vat_init"
 )
 
 type MockVatInitConverter struct {
-	converterErr error
-	PassedLogs   []types.Log
+	converterError error
+	PassedLogs     []types.Log
 }
 
-func (converter *MockVatInitConverter) ToModels(ethLogs []types.Log) ([]vat_init.VatInitModel, error) {
+func (converter *MockVatInitConverter) ToModels(ethLogs []types.Log) ([]interface{}, error) {
 	converter.PassedLogs = ethLogs
-	return []vat_init.VatInitModel{test_data.VatInitModel}, converter.converterErr
+	return []interface{}{test_data.VatInitModel}, converter.converterError
 }
 
 func (converter *MockVatInitConverter) SetConverterError(e error) {
-	converter.converterErr = e
+	converter.converterError = e
 }

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

@@ -16,46 +16,47 @@ package vat_init
 
 import (
 	. "github.com/onsi/gomega"
+	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
 
 	"github.com/vulcanize/vulcanizedb/pkg/core"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/vat_init"
 )
 
 type MockVatInitRepository struct {
-	createErr                       error
-	markHeaderCheckedErr            error
+	createError                     error
+	markHeaderCheckedError          error
 	markHeaderCheckedPassedHeaderID int64
 	missingHeaders                  []core.Header
-	missingHeadersErr               error
+	missingHeadersError             error
 	PassedStartingBlockNumber       int64
 	PassedEndingBlockNumber         int64
 	PassedHeaderID                  int64
-	PassedModels                    []vat_init.VatInitModel
+	PassedModels                    []interface{}
+	SetDbCalled                     bool
 }
 
-func (repository *MockVatInitRepository) Create(headerID int64, models []vat_init.VatInitModel) error {
+func (repository *MockVatInitRepository) Create(headerID int64, models []interface{}) error {
 	repository.PassedHeaderID = headerID
 	repository.PassedModels = models
-	return repository.createErr
+	return repository.createError
 }
 
 func (repository *MockVatInitRepository) MarkHeaderChecked(headerID int64) error {
 	repository.markHeaderCheckedPassedHeaderID = headerID
-	return repository.markHeaderCheckedErr
+	return repository.markHeaderCheckedError
 }
 
 func (repository *MockVatInitRepository) MissingHeaders(startingBlockNumber, endingBlockNumber int64) ([]core.Header, error) {
 	repository.PassedStartingBlockNumber = startingBlockNumber
 	repository.PassedEndingBlockNumber = endingBlockNumber
-	return repository.missingHeaders, repository.missingHeadersErr
+	return repository.missingHeaders, repository.missingHeadersError
 }
 
-func (repository *MockVatInitRepository) SetMarkHeaderCheckedErr(e error) {
-	repository.markHeaderCheckedErr = e
+func (repository *MockVatInitRepository) SetMarkHeaderCheckedError(e error) {
+	repository.markHeaderCheckedError = e
 }
 
-func (repository *MockVatInitRepository) SetMissingHeadersErr(e error) {
-	repository.missingHeadersErr = e
+func (repository *MockVatInitRepository) SetMissingHeadersError(e error) {
+	repository.missingHeadersError = e
 }
 
 func (repository *MockVatInitRepository) SetMissingHeaders(headers []core.Header) {
@@ -63,9 +64,13 @@ func (repository *MockVatInitRepository) SetMissingHeaders(headers []core.Header
 }
 
 func (repository *MockVatInitRepository) SetCreateError(e error) {
-	repository.createErr = e
+	repository.createError = e
 }
 
 func (repository *MockVatInitRepository) AssertMarkHeaderCheckedCalledWith(i int64) {
 	Expect(repository.markHeaderCheckedPassedHeaderID).To(Equal(i))
 }
+
+func (repository *MockVatInitRepository) SetDB(db *postgres.DB) {
+	repository.SetDbCalled = true
+}

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

@@ -17,7 +17,6 @@ package vat_move
 import (
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/test_data"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/vat_move"
 )
 
 type MockVatMoveConverter struct {
@@ -25,9 +24,9 @@ type MockVatMoveConverter struct {
 	PassedLogs     []types.Log
 }
 
-func (converter *MockVatMoveConverter) ToModels(ethLogs []types.Log) ([]vat_move.VatMoveModel, error) {
+func (converter *MockVatMoveConverter) ToModels(ethLogs []types.Log) ([]interface{}, error) {
 	converter.PassedLogs = ethLogs
-	return []vat_move.VatMoveModel{test_data.VatMoveModel}, converter.converterError
+	return []interface{}{test_data.VatMoveModel}, converter.converterError
 }
 
 func (converter *MockVatMoveConverter) SetConverterError(e error) {

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

@@ -16,7 +16,7 @@ package vat_move
 
 import (
 	"github.com/vulcanize/vulcanizedb/pkg/core"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/vat_move"
+	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
 )
 
 type MockVatMoveRepository struct {
@@ -26,12 +26,13 @@ type MockVatMoveRepository struct {
 	PassedStartingBlockNumber int64
 	PassedEndingBlockNumber   int64
 	PassedHeaderID            int64
-	PassedModels              []vat_move.VatMoveModel
+	PassedModels              []interface{}
 	CheckedHeaderIDs          []int64
 	CheckedHeaderError        error
+	SetDbCalled               bool
 }
 
-func (repository *MockVatMoveRepository) Create(headerID int64, models []vat_move.VatMoveModel) error {
+func (repository *MockVatMoveRepository) Create(headerID int64, models []interface{}) error {
 	repository.PassedHeaderID = headerID
 	repository.PassedModels = models
 	return repository.createError
@@ -63,3 +64,7 @@ func (repository *MockVatMoveRepository) MarkHeaderChecked(headerId int64) error
 func (repository *MockVatMoveRepository) SetCheckedHeaderError(e error) {
 	repository.CheckedHeaderError = e
 }
+
+func (repository *MockVatMoveRepository) SetDB(db *postgres.DB) {
+	repository.SetDbCalled = true
+}

pkg/transformers/test_data/wrong_model.go

@@ -0,0 +1,17 @@
+// Copyright 2018 Vulcanize
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package test_data
+
+type WrongModel struct{}

pkg/transformers/transformers.go

@@ -23,14 +23,13 @@ import (
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/deal"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/dent"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/drip_drip"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/drip_file"
 	ilk2 "github.com/vulcanize/vulcanizedb/pkg/transformers/drip_file/ilk"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/drip_file/repo"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/drip_file/vow"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/factories"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/flip_kick"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/flop_kick"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/frob"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/pit_file"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/pit_file/debt_ceiling"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/pit_file/ilk"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/pit_file/stability_fee"
@@ -49,36 +48,86 @@ import (
 )
 
 var (
-	BiteTransformerInitializer                = bite.BiteTransformerInitializer{Config: bite.BiteConfig}.NewBiteTransformer
-	catFileConfig                             = cat_file.CatFileConfig
-	CatFileChopLumpTransformerInitializer     = chop_lump.CatFileChopLumpTransformerInitializer{Config: catFileConfig}.NewCatFileChopLumpTransformer
-	CatFileFlipTransformerInitializer         = flip.CatFileFlipTransformerInitializer{Config: catFileConfig}.NewCatFileFlipTransformer
-	CatFilePitVowTransformerInitializer       = pit_vow.CatFilePitVowTransformerInitializer{Config: catFileConfig}.NewCatFilePitVowTransformer
-	DealTransformerInitializer                = deal.DealTransformerInitializer{Config: deal.Config}.NewDealTransformer
-	DentTransformerInitializer                = dent.DentTransformerInitializer{Config: dent.DentConfig}.NewDentTransformer
-	DripDripTransformerInitializer            = drip_drip.DripDripTransformerInitializer{Config: drip_drip.DripDripConfig}.NewDripDripTransformer
-	dripFileConfig                            = drip_file.DripFileConfig
-	DripFileIlkTransformerInitializer         = ilk2.DripFileIlkTransformerInitializer{Config: dripFileConfig}.NewDripFileIlkTransformer
-	DripFileRepoTransformerInitializer        = repo.DripFileRepoTransformerInitializer{Config: dripFileConfig}.NewDripFileRepoTransformer
-	DripFileVowTransfromerInitializer         = vow.DripFileVowTransformerInitializer{Config: dripFileConfig}.NewDripFileVowTransformer
-	FlipKickTransformerInitializer            = flip_kick.FlipKickTransformerInitializer{Config: flip_kick.FlipKickConfig}.NewFlipKickTransformer
-	FlopKickTransformerInitializer            = flop_kick.FlopKickTransformerInitializer{Config: flop_kick.Config}.NewFlopKickTransformer
-	FrobTransformerInitializer                = frob.FrobTransformerInitializer{Config: frob.FrobConfig}.NewFrobTransformer
-	pitFileConfig                             = pit_file.PitFileConfig
-	PitFileDebtCeilingTransformerInitializer  = debt_ceiling.PitFileDebtCeilingTransformerInitializer{Config: pitFileConfig}.NewPitFileDebtCeilingTransformer
-	PitFileIlkTransformerInitializer          = ilk.PitFileIlkTransformerInitializer{Config: pitFileConfig}.NewPitFileIlkTransformer
-	PitFileStabilityFeeTransformerInitializer = stability_fee.PitFileStabilityFeeTransformerInitializer{Config: pitFileConfig}.NewPitFileStabilityFeeTransformer
-	PriceFeedTransformerInitializer           = price_feeds.PriceFeedTransformerInitializer{Config: price_feeds.PriceFeedConfig}.NewPriceFeedTransformer
-	TendTransformerInitializer                = tend.TendTransformerInitializer{Config: tend.TendConfig}.NewTendTransformer
-	VatGrabTransformerInitializer             = vat_grab.VatGrabTransformerInitializer{Config: vat_grab.VatGrabConfig}.NewVatGrabTransformer
-	VatInitTransformerInitializer             = vat_init.VatInitTransformerInitializer{Config: vat_init.VatInitConfig}.NewVatInitTransformer
-	VatMoveTransformerInitializer             = vat_move.VatMoveTransformerInitializer{Config: vat_move.VatMoveConfig}.NewVatMoveTransformer
-	VatHealTransformerInitializer             = vat_heal.VatHealTransformerInitializer{Config: vat_heal.VatHealConfig}.NewVatHealTransformer
-	VatFoldTransformerInitializer             = vat_fold.VatFoldTransformerInitializer{Config: vat_fold.VatFoldConfig}.NewVatFoldTransformer
-	VatSlipTransformerInitializer             = vat_slip.VatSlipTransformerInitializer{Config: vat_slip.VatSlipConfig}.NewVatSlipTransformer
-	VatTollTransformerInitializer             = vat_toll.VatTollTransformerInitializer{Config: vat_toll.VatTollConfig}.NewVatTollTransformer
-	VatTuneTransformerInitializer             = vat_tune.VatTuneTransformerInitializer{Config: vat_tune.VatTuneConfig}.NewVatTuneTransformer
-	VatFluxTransformerInitializer             = vat_flux.VatFluxTransformerInitializer{Config: vat_flux.VatFluxConfig}.NewVatFluxTransformer
+	BiteTransformerInitializer            = bite.BiteTransformerInitializer{Config: bite.BiteConfig}.NewBiteTransformer
+	catFileConfig                         = cat_file.CatFileConfig
+	CatFileChopLumpTransformerInitializer = chop_lump.CatFileChopLumpTransformerInitializer{Config: catFileConfig}.NewCatFileChopLumpTransformer
+	CatFileFlipTransformerInitializer     = flip.CatFileFlipTransformerInitializer{Config: catFileConfig}.NewCatFileFlipTransformer
+	CatFilePitVowTransformerInitializer   = pit_vow.CatFilePitVowTransformerInitializer{Config: catFileConfig}.NewCatFilePitVowTransformer
+	DealTransformerInitializer            = deal.DealTransformerInitializer{Config: deal.Config}.NewDealTransformer
+	DentTransformerInitializer            = dent.DentTransformerInitializer{Config: dent.DentConfig}.NewDentTransformer
+	DripDripTransformerInitializer        = drip_drip.DripDripTransformerInitializer{Config: drip_drip.DripDripConfig}.NewDripDripTransformer
+	DripFileIlkTransformerInitializer     = factories.Transformer{
+		Config:     ilk2.DripFileIlkConfig,
+		Converter:  &ilk2.DripFileIlkConverter{},
+		Repository: &ilk2.DripFileIlkRepository{},
+		Fetcher:    &shared.Fetcher{},
+	}.NewTransformer
+
+	DripFileRepoTransformerInitializer = factories.Transformer{
+		Config:     repo.DripFileRepoConfig,
+		Converter:  &repo.DripFileRepoConverter{},
+		Repository: &repo.DripFileRepoRepository{},
+		Fetcher:    &shared.Fetcher{},
+	}.NewTransformer
+
+	DripFileVowTransfromerInitializer = factories.Transformer{
+		Config:     vow.DripFileVowConfig,
+		Converter:  &vow.DripFileVowConverter{},
+		Repository: &vow.DripFileVowRepository{},
+		Fetcher:    &shared.Fetcher{},
+	}.NewTransformer
+
+	FlipKickTransformerInitializer           = flip_kick.FlipKickTransformerInitializer{Config: flip_kick.FlipKickConfig}.NewFlipKickTransformer
+	FlopKickTransformerInitializer           = flop_kick.FlopKickTransformerInitializer{Config: flop_kick.Config}.NewFlopKickTransformer
+	FrobTransformerInitializer               = frob.FrobTransformerInitializer{Config: frob.FrobConfig}.NewFrobTransformer
+	PitFileDebtCeilingTransformerInitializer = factories.Transformer{
+		Config:     debt_ceiling.DebtCeilingFileConfig,
+		Converter:  &debt_ceiling.PitFileDebtCeilingConverter{},
+		Repository: &debt_ceiling.PitFileDebtCeilingRepository{},
+		Fetcher:    &shared.Fetcher{},
+	}.NewTransformer
+
+	PitFileIlkTransformerInitializer = factories.Transformer{
+		Config:     ilk.IlkFileConfig,
+		Converter:  &ilk.PitFileIlkConverter{},
+		Repository: &ilk.PitFileIlkRepository{},
+		Fetcher:    &shared.Fetcher{},
+	}.NewTransformer
+
+	PitFileStabilityFeeTransformerInitializer = factories.Transformer{
+		Config:     stability_fee.StabilityFeeFileConfig,
+		Converter:  &stability_fee.PitFileStabilityFeeConverter{},
+		Repository: &stability_fee.PitFileStabilityFeeRepository{},
+		Fetcher:    &shared.Fetcher{},
+	}.NewTransformer
+
+	PriceFeedTransformerInitializer = price_feeds.PriceFeedTransformerInitializer{Config: price_feeds.PriceFeedConfig}.NewPriceFeedTransformer
+	TendTransformerInitializer      = factories.Transformer{
+		Config:     tend.TendConfig,
+		Converter:  &tend.TendConverter{},
+		Repository: &tend.TendRepository{},
+		Fetcher:    &shared.Fetcher{},
+	}.NewTransformer
+
+	VatInitTransformerInitializer = factories.Transformer{
+		Config:     vat_init.VatInitConfig,
+		Converter:  &vat_init.VatInitConverter{},
+		Repository: &vat_init.VatInitRepository{},
+		Fetcher:    &shared.Fetcher{},
+	}.NewTransformer
+	VatGrabTransformerInitializer = vat_grab.VatGrabTransformerInitializer{Config: vat_grab.VatGrabConfig}.NewVatGrabTransformer
+	VatHealTransformerInitializer = vat_heal.VatHealTransformerInitializer{Config: vat_heal.VatHealConfig}.NewVatHealTransformer
+	VatFoldTransformerInitializer = vat_fold.VatFoldTransformerInitializer{Config: vat_fold.VatFoldConfig}.NewVatFoldTransformer
+	VatMoveTransformerInitializer = factories.Transformer{
+		Config:     vat_move.VatMoveConfig,
+		Converter:  &vat_move.VatMoveConverter{},
+		Repository: &vat_move.VatMoveRepository{},
+		Fetcher:    &shared.Fetcher{},
+	}.NewTransformer
+	VatSlipTransformerInitializer = vat_slip.VatSlipTransformerInitializer{Config: vat_slip.VatSlipConfig}.NewVatSlipTransformer
+	VatTollTransformerInitializer = vat_toll.VatTollTransformerInitializer{Config: vat_toll.VatTollConfig}.NewVatTollTransformer
+	VatTuneTransformerInitializer = vat_tune.VatTuneTransformerInitializer{Config: vat_tune.VatTuneConfig}.NewVatTuneTransformer
+	VatFluxTransformerInitializer = vat_flux.VatFluxTransformerInitializer{Config: vat_flux.VatFluxConfig}.NewVatFluxTransformer
 )
 
 func TransformerInitializers() []shared.TransformerInitializer {

pkg/transformers/vat_init/config.go

@@ -18,10 +18,11 @@ import (
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
 )
 
-var VatInitConfig = shared.TransformerConfig{
+var VatInitConfig = shared.SingleTransformerConfig{
+	TransformerName:     shared.VatInitLabel,
 	ContractAddresses:   []string{shared.VatContractAddress},
 	ContractAbi:         shared.VatABI,
-	Topics:              []string{shared.VatInitSignature},
+	Topic:               shared.VatInitSignature,
 	StartingBlockNumber: 0,
 	EndingBlockNumber:   10000000,
 }

pkg/transformers/vat_init/converter.go

@@ -18,18 +18,13 @@ import (
 	"bytes"
 	"encoding/json"
 	"errors"
-
 	"github.com/ethereum/go-ethereum/core/types"
 )
 
-type Converter interface {
-	ToModels(ethLogs []types.Log) ([]VatInitModel, error)
-}
-
 type VatInitConverter struct{}
 
-func (VatInitConverter) ToModels(ethLogs []types.Log) ([]VatInitModel, error) {
-	var models []VatInitModel
+func (VatInitConverter) ToModels(ethLogs []types.Log) ([]interface{}, error) {
+	var models []interface{}
 	for _, ethLog := range ethLogs {
 		err := verifyLog(ethLog)
 		if err != nil {

pkg/transformers/vat_init/converter_test.go

@@ -24,18 +24,20 @@ import (
 )
 
 var _ = Describe("Vat init converter", func() {
-	It("returns err if log missing topics", func() {
-		converter := vat_init.VatInitConverter{}
-		badLog := types.Log{}
+	var converter vat_init.VatInitConverter
 
+	BeforeEach(func() {
+		converter = vat_init.VatInitConverter{}
+	})
+
+	It("returns err if log missing topics", func() {
+		badLog := types.Log{}
 		_, err := converter.ToModels([]types.Log{badLog})
 
 		Expect(err).To(HaveOccurred())
 	})
 
 	It("converts a log to an model", func() {
-		converter := vat_init.VatInitConverter{}
-
 		models, err := converter.ToModels([]types.Log{test_data.EthVatInitLog})
 
 		Expect(err).NotTo(HaveOccurred())

pkg/transformers/vat_init/repository.go

@@ -15,42 +15,42 @@
 package vat_init
 
 import (
+	"fmt"
 	"github.com/vulcanize/vulcanizedb/pkg/core"
 	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
+	"log"
 )
 
-type Repository interface {
-	Create(headerID int64, models []VatInitModel) error
-	MarkHeaderChecked(headerID int64) error
-	MissingHeaders(startingBlockNumber, endingBlockNumber int64) ([]core.Header, error)
-}
-
 type VatInitRepository struct {
 	db *postgres.DB
 }
 
-func NewVatInitRepository(db *postgres.DB) VatInitRepository {
-	return VatInitRepository{
-		db: db,
-	}
-}
-
-func (repository VatInitRepository) Create(headerID int64, models []VatInitModel) error {
+func (repository VatInitRepository) Create(headerID int64, models []interface{}) error {
 	tx, err := repository.db.Begin()
 	if err != nil {
 		return err
 	}
+
 	for _, model := range models {
+		vatInit, ok := model.(VatInitModel)
+		if !ok {
+			tx.Rollback()
+			return fmt.Errorf("model of type %T, not %T", model, VatInitModel{})
+		}
+
+		log.Printf("VatInit model: %v", vatInit)
 		_, err = tx.Exec(
-			`INSERT into maker.vat_init (header_id, ilk, tx_idx, raw_log)
-        VALUES($1, $2, $3, $4)`,
-			headerID, model.Ilk, model.TransactionIndex, model.Raw,
+			`INSERT INTO maker.vat_init (header_id, ilk, tx_idx, raw_log)
+			VALUES($1, $2, $3, $4)`,
+			headerID, vatInit.Ilk, vatInit.TransactionIndex, vatInit.Raw,
 		)
 		if err != nil {
 			tx.Rollback()
+			log.Printf("Error: %v \n", err)
 			return err
 		}
 	}
+
 	_, err = tx.Exec(`INSERT INTO public.checked_headers (header_id, vat_init_checked)
 			VALUES($1, $2)
 		ON CONFLICT (header_id) DO
@@ -87,3 +87,7 @@ func (repository VatInitRepository) MissingHeaders(startingBlockNumber, endingBl
 	)
 	return result, err
 }
+
+func (repository *VatInitRepository) SetDB(db *postgres.DB) {
+	repository.db = db
+}

pkg/transformers/vat_init/repository_test.go

@@ -16,6 +16,7 @@ package vat_init_test
 
 import (
 	"database/sql"
+	"math/rand"
 
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
@@ -32,7 +33,7 @@ import (
 var _ = Describe("Vat init repository", func() {
 	var (
 		db                *postgres.DB
-		vatInitRepository vat_init.Repository
+		vatInitRepository vat_init.VatInitRepository
 		headerRepository  repositories.HeaderRepository
 		err               error
 	)
@@ -40,7 +41,8 @@ var _ = Describe("Vat init repository", func() {
 	BeforeEach(func() {
 		db = test_config.NewTestDB(core.Node{})
 		test_config.CleanTestDB(db)
-		vatInitRepository = vat_init.NewVatInitRepository(db)
+		vatInitRepository = vat_init.VatInitRepository{}
+		vatInitRepository.SetDB(db)
 		headerRepository = repositories.NewHeaderRepository(db)
 	})
 
@@ -51,13 +53,13 @@ var _ = Describe("Vat init repository", func() {
 			headerID, err = headerRepository.CreateOrUpdateHeader(fakes.FakeHeader)
 			Expect(err).NotTo(HaveOccurred())
 
-			err = vatInitRepository.Create(headerID, []vat_init.VatInitModel{test_data.VatInitModel})
+			err = vatInitRepository.Create(headerID, []interface{}{test_data.VatInitModel})
 			Expect(err).NotTo(HaveOccurred())
 		})
 
 		It("adds a vat event", func() {
 			var dbVatInit vat_init.VatInitModel
-			err = db.Get(&dbVatInit, `SELECT ilk,tx_idx, raw_log FROM maker.vat_init WHERE header_id = $1`, headerID)
+			err = db.Get(&dbVatInit, `SELECT ilk, tx_idx, raw_log FROM maker.vat_init WHERE header_id = $1`, headerID)
 			Expect(err).NotTo(HaveOccurred())
 			Expect(dbVatInit.Ilk).To(Equal(test_data.VatInitModel.Ilk))
 			Expect(dbVatInit.TransactionIndex).To(Equal(test_data.VatInitModel.TransactionIndex))
@@ -65,7 +67,7 @@ var _ = Describe("Vat init repository", func() {
 		})
 
 		It("does not duplicate vat events", func() {
-			err = vatInitRepository.Create(headerID, []vat_init.VatInitModel{test_data.VatInitModel})
+			err = vatInitRepository.Create(headerID, []interface{}{test_data.VatInitModel})
 
 			Expect(err).To(HaveOccurred())
 			Expect(err.Error()).To(ContainSubstring("pq: duplicate key value violates unique constraint"))
@@ -87,6 +89,12 @@ var _ = Describe("Vat init repository", func() {
 			Expect(err).NotTo(HaveOccurred())
 			Expect(headerChecked).To(BeTrue())
 		})
+
+		It("Returns an error if model is of wrong type", func() {
+			err = vatInitRepository.Create(headerID, []interface{}{test_data.WrongModel{}})
+			Expect(err).To(HaveOccurred())
+			Expect(err.Error()).To(ContainSubstring("model of type"))
+		})
 	})
 
 	Describe("MarkHeaderChecked", func() {
@@ -95,7 +103,6 @@ var _ = Describe("Vat init repository", func() {
 		BeforeEach(func() {
 			headerID, err = headerRepository.CreateOrUpdateHeader(fakes.FakeHeader)
 			Expect(err).NotTo(HaveOccurred())
-
 		})
 
 		It("creates a row for a new headerID", func() {
@@ -128,7 +135,7 @@ var _ = Describe("Vat init repository", func() {
 		)
 
 		BeforeEach(func() {
-			startingBlock = GinkgoRandomSeed()
+			startingBlock = rand.Int63()
 			vatInitBlock = startingBlock + 1
 			endingBlock = startingBlock + 2
 
@@ -174,8 +181,10 @@ var _ = Describe("Vat init repository", func() {
 				_, err = headerRepositoryTwo.CreateOrUpdateHeader(fakes.GetFakeHeader(n))
 				Expect(err).NotTo(HaveOccurred())
 			}
-			vatInitRepositoryTwo := vat_init.NewVatInitRepository(dbTwo)
-			err := vatInitRepository.MarkHeaderChecked(headerIDs[0])
+
+			vatInitRepositoryTwo := vat_init.VatInitRepository{}
+			vatInitRepositoryTwo.SetDB(dbTwo)
+			err = vatInitRepository.MarkHeaderChecked(headerIDs[0])
 			Expect(err).NotTo(HaveOccurred())
 
 			nodeOneMissingHeaders, err := vatInitRepository.MissingHeaders(blockNumbers[0], blockNumbers[len(blockNumbers)-1])

pkg/transformers/vat_init/transformer.go

@@ -1,78 +0,0 @@
-// Copyright 2018 Vulcanize
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package vat_init
-
-import (
-	"log"
-
-	"github.com/ethereum/go-ethereum/common"
-
-	"github.com/vulcanize/vulcanizedb/pkg/core"
-	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
-)
-
-type VatInitTransformerInitializer struct {
-	Config shared.TransformerConfig
-}
-
-func (initializer VatInitTransformerInitializer) NewVatInitTransformer(db *postgres.DB, blockChain core.BlockChain) shared.Transformer {
-	converter := VatInitConverter{}
-	fetcher := shared.NewFetcher(blockChain)
-	repository := NewVatInitRepository(db)
-	return VatInitTransformer{
-		Config:     initializer.Config,
-		Converter:  converter,
-		Fetcher:    fetcher,
-		Repository: repository,
-	}
-}
-
-type VatInitTransformer struct {
-	Config     shared.TransformerConfig
-	Converter  Converter
-	Fetcher    shared.LogFetcher
-	Repository Repository
-}
-
-func (transformer VatInitTransformer) Execute() error {
-	missingHeaders, err := transformer.Repository.MissingHeaders(transformer.Config.StartingBlockNumber, transformer.Config.EndingBlockNumber)
-	if err != nil {
-		return err
-	}
-	log.Printf("Fetching vat init event logs for %d headers \n", len(missingHeaders))
-	for _, header := range missingHeaders {
-		topics := [][]common.Hash{{common.HexToHash(shared.VatInitSignature)}}
-		matchingLogs, err := transformer.Fetcher.FetchLogs(VatInitConfig.ContractAddresses, topics, header.BlockNumber)
-		if err != nil {
-			return err
-		}
-		if len(matchingLogs) < 1 {
-			err = transformer.Repository.MarkHeaderChecked(header.Id)
-			if err != nil {
-				return err
-			}
-		}
-		models, err := transformer.Converter.ToModels(matchingLogs)
-		if err != nil {
-			return err
-		}
-		err = transformer.Repository.Create(header.Id, models)
-		if err != nil {
-			return err
-		}
-	}
-	return nil
-}

pkg/transformers/vat_init/transformer_test.go

@@ -19,6 +19,8 @@ import (
 	"github.com/ethereum/go-ethereum/core/types"
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/factories"
+	"math/rand"
 
 	"github.com/vulcanize/vulcanizedb/pkg/core"
 	"github.com/vulcanize/vulcanizedb/pkg/fakes"
@@ -30,15 +32,36 @@ import (
 )
 
 var _ = Describe("Vat init transformer", func() {
-	It("gets missing headers for block numbers specified in config", func() {
-		repository := &vat_init_mocks.MockVatInitRepository{}
-		transformer := vat_init.VatInitTransformer{
-			Config:     vat_init.VatInitConfig,
-			Fetcher:    &mocks.MockLogFetcher{},
-			Converter:  &vat_init_mocks.MockVatInitConverter{},
-			Repository: repository,
-		}
+	var (
+		config      = vat_init.VatInitConfig
+		converter   vat_init_mocks.MockVatInitConverter
+		repository  vat_init_mocks.MockVatInitRepository
+		fetcher     mocks.MockLogFetcher
+		transformer shared.Transformer
+		headerOne   core.Header
+		headerTwo   core.Header
+	)
 
+	BeforeEach(func() {
+		converter = vat_init_mocks.MockVatInitConverter{}
+		repository = vat_init_mocks.MockVatInitRepository{}
+		fetcher = mocks.MockLogFetcher{}
+		headerOne = core.Header{Id: rand.Int63(), BlockNumber: rand.Int63()}
+		headerTwo = core.Header{Id: rand.Int63(), BlockNumber: rand.Int63()}
+		transformer = factories.Transformer{
+			Config:     config,
+			Fetcher:    &fetcher,
+			Converter:  &converter,
+			Repository: &repository,
+		}.NewTransformer(nil, nil)
+	})
+
+	It("sets the blockchain and database", func() {
+		Expect(fetcher.SetBcCalled).To(BeTrue())
+		Expect(repository.SetDbCalled).To(BeTrue())
+	})
+
+	It("gets missing headers for block numbers specified in config", func() {
 		err := transformer.Execute()
 
 		Expect(err).NotTo(HaveOccurred())
@@ -47,13 +70,7 @@ var _ = Describe("Vat init transformer", func() {
 	})
 
 	It("returns error if repository returns error for missing headers", func() {
-		repository := &vat_init_mocks.MockVatInitRepository{}
-		repository.SetMissingHeadersErr(fakes.FakeError)
-		transformer := vat_init.VatInitTransformer{
-			Fetcher:    &mocks.MockLogFetcher{},
-			Converter:  &vat_init_mocks.MockVatInitConverter{},
-			Repository: repository,
-		}
+		repository.SetMissingHeadersError(fakes.FakeError)
 
 		err := transformer.Execute()
 
@@ -62,33 +79,20 @@ var _ = Describe("Vat init transformer", func() {
 	})
 
 	It("fetches logs for missing headers", func() {
-		fetcher := &mocks.MockLogFetcher{}
-		repository := &vat_init_mocks.MockVatInitRepository{}
-		repository.SetMissingHeaders([]core.Header{{BlockNumber: 1}, {BlockNumber: 2}})
-		transformer := vat_init.VatInitTransformer{
-			Fetcher:    fetcher,
-			Converter:  &vat_init_mocks.MockVatInitConverter{},
-			Repository: repository,
-		}
+		repository.SetMissingHeaders([]core.Header{headerOne, headerTwo})
 
 		err := transformer.Execute()
 
 		Expect(err).NotTo(HaveOccurred())
-		Expect(fetcher.FetchedBlocks).To(Equal([]int64{1, 2}))
-		Expect(fetcher.FetchedContractAddresses).To(Equal([][]string{vat_init.VatInitConfig.ContractAddresses, vat_init.VatInitConfig.ContractAddresses}))
+		Expect(fetcher.FetchedBlocks).To(Equal([]int64{headerOne.BlockNumber, headerTwo.BlockNumber}))
+		Expect(fetcher.FetchedContractAddresses).To(Equal(
+			[][]string{config.ContractAddresses, config.ContractAddresses}))
 		Expect(fetcher.FetchedTopics).To(Equal([][]common.Hash{{common.HexToHash(shared.VatInitSignature)}}))
 	})
 
 	It("returns error if fetcher returns error", func() {
-		fetcher := &mocks.MockLogFetcher{}
 		fetcher.SetFetcherError(fakes.FakeError)
-		repository := &vat_init_mocks.MockVatInitRepository{}
-		repository.SetMissingHeaders([]core.Header{{BlockNumber: 1}})
-		transformer := vat_init.VatInitTransformer{
-			Fetcher:    fetcher,
-			Converter:  &vat_init_mocks.MockVatInitConverter{},
-			Repository: repository,
-		}
+		repository.SetMissingHeaders([]core.Header{headerOne})
 
 		err := transformer.Execute()
 
@@ -97,34 +101,17 @@ var _ = Describe("Vat init transformer", func() {
 	})
 
 	It("marks header checked if no logs returned", func() {
-		mockConverter := &vat_init_mocks.MockVatInitConverter{}
-		mockRepository := &vat_init_mocks.MockVatInitRepository{}
-		headerID := int64(123)
-		mockRepository.SetMissingHeaders([]core.Header{{Id: headerID}})
-		mockFetcher := &mocks.MockLogFetcher{}
-		transformer := vat_init.VatInitTransformer{
-			Converter:  mockConverter,
-			Fetcher:    mockFetcher,
-			Repository: mockRepository,
-		}
+		repository.SetMissingHeaders([]core.Header{headerOne})
 
 		err := transformer.Execute()
 
 		Expect(err).NotTo(HaveOccurred())
-		mockRepository.AssertMarkHeaderCheckedCalledWith(headerID)
+		repository.AssertMarkHeaderCheckedCalledWith(headerOne.Id)
 	})
 
 	It("returns error if marking header checked returns err", func() {
-		mockConverter := &vat_init_mocks.MockVatInitConverter{}
-		mockRepository := &vat_init_mocks.MockVatInitRepository{}
-		mockRepository.SetMissingHeaders([]core.Header{{Id: int64(123)}})
-		mockRepository.SetMarkHeaderCheckedErr(fakes.FakeError)
-		mockFetcher := &mocks.MockLogFetcher{}
-		transformer := vat_init.VatInitTransformer{
-			Converter:  mockConverter,
-			Fetcher:    mockFetcher,
-			Repository: mockRepository,
-		}
+		repository.SetMissingHeaders([]core.Header{headerOne})
+		repository.SetMarkHeaderCheckedError(fakes.FakeError)
 
 		err := transformer.Execute()
 
@@ -133,16 +120,8 @@ var _ = Describe("Vat init transformer", func() {
 	})
 
 	It("converts matching logs", func() {
-		converter := &vat_init_mocks.MockVatInitConverter{}
-		fetcher := &mocks.MockLogFetcher{}
 		fetcher.SetFetchedLogs([]types.Log{test_data.EthVatInitLog})
-		repository := &vat_init_mocks.MockVatInitRepository{}
-		repository.SetMissingHeaders([]core.Header{{BlockNumber: 1}})
-		transformer := vat_init.VatInitTransformer{
-			Fetcher:    fetcher,
-			Converter:  converter,
-			Repository: repository,
-		}
+		repository.SetMissingHeaders([]core.Header{headerOne})
 
 		err := transformer.Execute()
 
@@ -151,17 +130,9 @@ var _ = Describe("Vat init transformer", func() {
 	})
 
 	It("returns error if converter returns error", func() {
-		converter := &vat_init_mocks.MockVatInitConverter{}
 		converter.SetConverterError(fakes.FakeError)
-		fetcher := &mocks.MockLogFetcher{}
 		fetcher.SetFetchedLogs([]types.Log{test_data.EthVatInitLog})
-		repository := &vat_init_mocks.MockVatInitRepository{}
-		repository.SetMissingHeaders([]core.Header{{BlockNumber: 1}})
-		transformer := vat_init.VatInitTransformer{
-			Fetcher:    fetcher,
-			Converter:  converter,
-			Repository: repository,
-		}
+		repository.SetMissingHeaders([]core.Header{headerOne})
 
 		err := transformer.Execute()
 
@@ -170,37 +141,20 @@ var _ = Describe("Vat init transformer", func() {
 	})
 
 	It("persists vat init model", func() {
-		converter := &vat_init_mocks.MockVatInitConverter{}
-		fetcher := &mocks.MockLogFetcher{}
 		fetcher.SetFetchedLogs([]types.Log{test_data.EthVatInitLog})
-		repository := &vat_init_mocks.MockVatInitRepository{}
-		fakeHeader := core.Header{BlockNumber: 1, Id: 2}
-		repository.SetMissingHeaders([]core.Header{fakeHeader})
-		transformer := vat_init.VatInitTransformer{
-			Fetcher:    fetcher,
-			Converter:  converter,
-			Repository: repository,
-		}
+		repository.SetMissingHeaders([]core.Header{headerOne})
 
 		err := transformer.Execute()
 
 		Expect(err).NotTo(HaveOccurred())
-		Expect(repository.PassedHeaderID).To(Equal(fakeHeader.Id))
-		Expect(repository.PassedModels).To(Equal([]vat_init.VatInitModel{test_data.VatInitModel}))
+		Expect(repository.PassedHeaderID).To(Equal(headerOne.Id))
+		Expect(repository.PassedModels).To(Equal([]interface{}{test_data.VatInitModel}))
 	})
 
 	It("returns error if repository returns error for create", func() {
-		converter := &vat_init_mocks.MockVatInitConverter{}
-		fetcher := &mocks.MockLogFetcher{}
 		fetcher.SetFetchedLogs([]types.Log{test_data.EthVatInitLog})
-		repository := &vat_init_mocks.MockVatInitRepository{}
-		repository.SetMissingHeaders([]core.Header{{BlockNumber: 1, Id: 2}})
+		repository.SetMissingHeaders([]core.Header{headerOne})
 		repository.SetCreateError(fakes.FakeError)
-		transformer := vat_init.VatInitTransformer{
-			Fetcher:    fetcher,
-			Converter:  converter,
-			Repository: repository,
-		}
 
 		err := transformer.Execute()
 

pkg/transformers/vat_move/config.go

@@ -18,10 +18,11 @@ import (
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
 )
 
-var VatMoveConfig = shared.TransformerConfig{
+var VatMoveConfig = shared.SingleTransformerConfig{
+	TransformerName:     shared.VatMoveLabel,
 	ContractAddresses:   []string{shared.VatContractAddress},
 	ContractAbi:         shared.VatABI,
-	Topics:              []string{shared.VatMoveSignature},
+	Topic:               shared.VatMoveSignature,
 	StartingBlockNumber: 0,
 	EndingBlockNumber:   10000000,
 }

pkg/transformers/vat_move/converter.go

@@ -21,18 +21,14 @@ import (
 	"github.com/ethereum/go-ethereum/core/types"
 )
 
-type Converter interface {
-	ToModels(ethLog []types.Log) ([]VatMoveModel, error)
-}
-
 type VatMoveConverter struct{}
 
-func (VatMoveConverter) ToModels(ethLogs []types.Log) ([]VatMoveModel, error) {
-	var models []VatMoveModel
+func (VatMoveConverter) ToModels(ethLogs []types.Log) ([]interface{}, error) {
+	var models []interface{}
 	for _, ethLog := range ethLogs {
 		err := verifyLog(ethLog)
 		if err != nil {
-			return []VatMoveModel{}, err
+			return []interface{}{}, err
 		}
 
 		src := common.BytesToAddress(ethLog.Topics[1].Bytes())
@@ -40,7 +36,7 @@ func (VatMoveConverter) ToModels(ethLogs []types.Log) ([]VatMoveModel, error) {
 		rad := ethLog.Topics[3].Big()
 		raw, err := json.Marshal(ethLog)
 		if err != nil {
-			return []VatMoveModel{}, err
+			return []interface{}{}, err
 		}
 
 		models = append(models, VatMoveModel{

pkg/transformers/vat_move/converter_test.go

@@ -24,18 +24,20 @@ import (
 )
 
 var _ = Describe("Vat move converter", func() {
-	It("returns err if logs are missing topics", func() {
-		converter := vat_move.VatMoveConverter{}
-		badLog := types.Log{}
+	var converter vat_move.VatMoveConverter
 
+	BeforeEach(func() {
+		converter = vat_move.VatMoveConverter{}
+	})
+
+	It("returns err if logs are missing topics", func() {
+		badLog := types.Log{}
 		_, err := converter.ToModels([]types.Log{badLog})
 
 		Expect(err).To(HaveOccurred())
 	})
 
 	It("converts a log to a model", func() {
-		converter := vat_move.VatMoveConverter{}
-
 		models, err := converter.ToModels([]types.Log{test_data.EthVatMoveLog})
 
 		Expect(err).NotTo(HaveOccurred())

pkg/transformers/vat_move/repository.go

@@ -15,33 +15,28 @@
 package vat_move
 
 import (
+	"fmt"
 	"github.com/vulcanize/vulcanizedb/pkg/core"
 	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
 )
 
-type Repository interface {
-	Create(headerID int64, models []VatMoveModel) error
-	MissingHeaders(startingBlockNumber, endingBlockNumber int64) ([]core.Header, error)
-	MarkHeaderChecked(headerID int64) error
-}
-
 type VatMoveRepository struct {
 	db *postgres.DB
 }
 
-func NewVatMoveRepository(db *postgres.DB) VatMoveRepository {
-	return VatMoveRepository{
-		db: db,
-	}
-}
-
-func (repository VatMoveRepository) Create(headerID int64, models []VatMoveModel) error {
+func (repository VatMoveRepository) Create(headerID int64, models []interface{}) error {
 	tx, err := repository.db.Begin()
 	if err != nil {
 		return err
 	}
 
-	for _, vatMove := range models {
+	for _, model := range models {
+		vatMove, ok := model.(VatMoveModel)
+		if !ok {
+			tx.Rollback()
+			return fmt.Errorf("model of type %T, not %T", model, VatMoveModel{})
+		}
+
 		_, err = tx.Exec(
 			`INSERT INTO maker.vat_move (header_id, src, dst, rad, tx_idx, raw_log)
         	VALUES ($1, $2, $3, $4::NUMERIC, $5, $6)`,
@@ -94,3 +89,7 @@ func (repository VatMoveRepository) MarkHeaderChecked(headerID int64) error {
 			UPDATE SET vat_move_checked = $2`, headerID, true)
 	return err
 }
+
+func (repository *VatMoveRepository) SetDB(db *postgres.DB) {
+	repository.db = db
+}

pkg/transformers/vat_move/repository_test.go

@@ -16,9 +16,9 @@ package vat_move_test
 
 import (
 	"database/sql"
-
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
+	"math/rand"
 
 	"github.com/vulcanize/vulcanizedb/pkg/core"
 	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
@@ -38,7 +38,8 @@ var _ = Describe("Vat Move", func() {
 		db = test_config.NewTestDB(core.Node{})
 		test_config.CleanTestDB(db)
 		headerRepository = repositories.NewHeaderRepository(db)
-		vatMoveRepository = vat_move.NewVatMoveRepository(db)
+		vatMoveRepository = vat_move.VatMoveRepository{}
+		vatMoveRepository.SetDB(db)
 	})
 
 	Describe("Create", func() {
@@ -48,7 +49,7 @@ var _ = Describe("Vat Move", func() {
 		BeforeEach(func() {
 			headerID, err = headerRepository.CreateOrUpdateHeader(fakes.FakeHeader)
 			Expect(err).NotTo(HaveOccurred())
-			err = vatMoveRepository.Create(headerID, []vat_move.VatMoveModel{test_data.VatMoveModel})
+			err = vatMoveRepository.Create(headerID, []interface{}{test_data.VatMoveModel})
 			Expect(err).NotTo(HaveOccurred())
 		})
 
@@ -71,7 +72,7 @@ var _ = Describe("Vat Move", func() {
 		})
 
 		It("returns an error if insertion fails", func() {
-			err = vatMoveRepository.Create(headerID, []vat_move.VatMoveModel{test_data.VatMoveModel})
+			err = vatMoveRepository.Create(headerID, []interface{}{test_data.VatMoveModel})
 			Expect(err).To(HaveOccurred())
 			Expect(err.Error()).To(ContainSubstring("pq: duplicate key value violates unique constraint"))
 		})
@@ -85,10 +86,16 @@ var _ = Describe("Vat Move", func() {
 			Expect(err).To(HaveOccurred())
 			Expect(err).To(MatchError(sql.ErrNoRows))
 		})
+
+		It("Returns an error if model is of wrong type", func() {
+			err = vatMoveRepository.Create(headerID, []interface{}{test_data.WrongModel{}})
+			Expect(err).To(HaveOccurred())
+			Expect(err.Error()).To(ContainSubstring("model of type"))
+		})
 	})
 
 	Describe("MissingHeaders", func() {
-		var eventBlockNumber = GinkgoRandomSeed()
+		var eventBlockNumber = rand.Int63()
 		var startingBlockNumber = eventBlockNumber - 1
 		var endingBlockNumber = eventBlockNumber + 1
 		var outOfRangeBlockNumber = eventBlockNumber + 2
@@ -145,8 +152,9 @@ var _ = Describe("Vat Move", func() {
 				_, err = headerRepositoryTwo.CreateOrUpdateHeader(fakes.GetFakeHeader(n))
 				Expect(err).NotTo(HaveOccurred())
 			}
-			vatMoveRepositoryTwo := vat_move.NewVatMoveRepository(dbTwo)
-			err := vatMoveRepository.Create(headerIDs[0], []vat_move.VatMoveModel{test_data.VatMoveModel})
+			vatMoveRepositoryTwo := vat_move.VatMoveRepository{}
+			vatMoveRepositoryTwo.SetDB(dbTwo)
+			err := vatMoveRepository.Create(headerIDs[0], []interface{}{test_data.VatMoveModel})
 			Expect(err).NotTo(HaveOccurred())
 
 			nodeOneMissingHeaders, err := vatMoveRepository.MissingHeaders(blockNumbers[0], blockNumbers[len(blockNumbers)-1])
@@ -157,7 +165,6 @@ var _ = Describe("Vat Move", func() {
 			Expect(err).NotTo(HaveOccurred())
 			Expect(len(nodeTwoMissingHeaders)).To(Equal(len(blockNumbers)))
 		})
-
 	})
 
 	Describe("MarkHeaderChecked", func() {

pkg/transformers/vat_move/transformer.go

@@ -1,83 +0,0 @@
-// Copyright 2018 Vulcanize
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package vat_move
-
-import (
-	"log"
-
-	"github.com/ethereum/go-ethereum/common"
-
-	"github.com/vulcanize/vulcanizedb/pkg/core"
-	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
-)
-
-type VatMoveTransformerInitializer struct {
-	Config shared.TransformerConfig
-}
-
-func (initializer VatMoveTransformerInitializer) NewVatMoveTransformer(db *postgres.DB, blockChain core.BlockChain) shared.Transformer {
-	converter := VatMoveConverter{}
-	fetcher := shared.NewFetcher(blockChain)
-	repository := NewVatMoveRepository(db)
-	return VatMoveTransformer{
-		Config:     initializer.Config,
-		Converter:  converter,
-		Fetcher:    fetcher,
-		Repository: repository,
-	}
-}
-
-type VatMoveTransformer struct {
-	Config     shared.TransformerConfig
-	Converter  Converter
-	Fetcher    shared.LogFetcher
-	Repository Repository
-}
-
-func (transformer VatMoveTransformer) Execute() error {
-	missingHeaders, err := transformer.Repository.MissingHeaders(transformer.Config.StartingBlockNumber, transformer.Config.EndingBlockNumber)
-	if err != nil {
-		return err
-	}
-
-	log.Printf("Fetching vat move event logs for %d headers \n", len(missingHeaders))
-	for _, header := range missingHeaders {
-		topics := [][]common.Hash{{common.HexToHash(shared.VatMoveSignature)}}
-		matchingLogs, err := transformer.Fetcher.FetchLogs(VatMoveConfig.ContractAddresses, topics, header.BlockNumber)
-		if err != nil {
-			return err
-		}
-
-		if len(matchingLogs) < 1 {
-			err := transformer.Repository.MarkHeaderChecked(header.Id)
-			if err != nil {
-				return err
-			}
-			continue
-		}
-
-		models, err := transformer.Converter.ToModels(matchingLogs)
-		if err != nil {
-			return err
-		}
-
-		err = transformer.Repository.Create(header.Id, models)
-		if err != nil {
-			return err
-		}
-	}
-	return nil
-}

pkg/transformers/vat_move/transformer_test.go

@@ -21,18 +21,21 @@ import (
 	. "github.com/onsi/gomega"
 	"github.com/vulcanize/vulcanizedb/pkg/core"
 	"github.com/vulcanize/vulcanizedb/pkg/fakes"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/factories"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/test_data"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/test_data/mocks"
 	vat_move_mocks "github.com/vulcanize/vulcanizedb/pkg/transformers/test_data/mocks/vat_move"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/vat_move"
+	"math/rand"
 )
 
 var _ = Describe("Vat move transformer", func() {
+	var config = vat_move.VatMoveConfig
 	var fetcher mocks.MockLogFetcher
 	var converter vat_move_mocks.MockVatMoveConverter
 	var repository vat_move_mocks.MockVatMoveRepository
-	var config = vat_move.VatMoveConfig
+	var transformer shared.Transformer
 	var headerOne core.Header
 	var headerTwo core.Header
 
@@ -40,18 +43,22 @@ var _ = Describe("Vat move transformer", func() {
 		fetcher = mocks.MockLogFetcher{}
 		converter = vat_move_mocks.MockVatMoveConverter{}
 		repository = vat_move_mocks.MockVatMoveRepository{}
-		headerOne = core.Header{Id: GinkgoRandomSeed(), BlockNumber: GinkgoRandomSeed()}
-		headerTwo = core.Header{Id: GinkgoRandomSeed(), BlockNumber: GinkgoRandomSeed()}
-	})
-
-	It("gets missing headers for block numbers specified in config", func() {
-		transformer := vat_move.VatMoveTransformer{
+		headerOne = core.Header{Id: rand.Int63(), BlockNumber: rand.Int63()}
+		headerTwo = core.Header{Id: rand.Int63(), BlockNumber: rand.Int63()}
+		transformer = factories.Transformer{
 			Config:     config,
 			Converter:  &converter,
 			Fetcher:    &fetcher,
 			Repository: &repository,
-		}
+		}.NewTransformer(nil, nil)
+	})
 
+	It("sets the blockchain and database", func() {
+		Expect(fetcher.SetBcCalled).To(BeTrue())
+		Expect(repository.SetDbCalled).To(BeTrue())
+	})
+
+	It("gets missing headers for block numbers specified in config", func() {
 		err := transformer.Execute()
 
 		Expect(err).NotTo(HaveOccurred())
@@ -61,12 +68,6 @@ var _ = Describe("Vat move transformer", func() {
 
 	It("returns error if repository returns error for missing headers", func() {
 		repository.SetMissingHeadersError(fakes.FakeError)
-		transformer := vat_move.VatMoveTransformer{
-			Config:     config,
-			Converter:  &converter,
-			Fetcher:    &fetcher,
-			Repository: &repository,
-		}
 
 		err := transformer.Execute()
 
@@ -76,12 +77,6 @@ var _ = Describe("Vat move transformer", func() {
 
 	It("fetches logs for missing headers", func() {
 		repository.SetMissingHeaders([]core.Header{headerOne, headerTwo})
-		transformer := vat_move.VatMoveTransformer{
-			Config:     config,
-			Fetcher:    &fetcher,
-			Converter:  &vat_move_mocks.MockVatMoveConverter{},
-			Repository: &repository,
-		}
 
 		err := transformer.Execute()
 
@@ -97,12 +92,6 @@ var _ = Describe("Vat move transformer", func() {
 	It("returns error if fetcher returns error", func() {
 		fetcher.SetFetcherError(fakes.FakeError)
 		repository.SetMissingHeaders([]core.Header{headerOne})
-		transformer := vat_move.VatMoveTransformer{
-			Config:     config,
-			Fetcher:    &fetcher,
-			Converter:  &converter,
-			Repository: &repository,
-		}
 
 		err := transformer.Execute()
 
@@ -113,12 +102,6 @@ var _ = Describe("Vat move transformer", func() {
 	It("converts matching logs", func() {
 		fetcher.SetFetchedLogs([]types.Log{test_data.EthVatMoveLog})
 		repository.SetMissingHeaders([]core.Header{headerOne})
-		transformer := vat_move.VatMoveTransformer{
-			Config:     config,
-			Fetcher:    &fetcher,
-			Converter:  &converter,
-			Repository: &repository,
-		}
 
 		err := transformer.Execute()
 
@@ -130,12 +113,6 @@ var _ = Describe("Vat move transformer", func() {
 		converter.SetConverterError(fakes.FakeError)
 		fetcher.SetFetchedLogs([]types.Log{test_data.EthVatMoveLog})
 		repository.SetMissingHeaders([]core.Header{headerOne})
-		transformer := vat_move.VatMoveTransformer{
-			Config:     config,
-			Fetcher:    &fetcher,
-			Converter:  &converter,
-			Repository: &repository,
-		}
 
 		err := transformer.Execute()
 
@@ -146,12 +123,6 @@ var _ = Describe("Vat move transformer", func() {
 	It("marks header as checked even if no logs were returned", func() {
 		repository.SetMissingHeaders([]core.Header{headerOne, headerTwo})
 		fetcher.SetFetchedLogs([]types.Log{})
-		transformer := vat_move.VatMoveTransformer{
-			Config:     config,
-			Converter:  &converter,
-			Fetcher:    &fetcher,
-			Repository: &repository,
-		}
 
 		err := transformer.Execute()
 		Expect(err).NotTo(HaveOccurred())
@@ -163,12 +134,6 @@ var _ = Describe("Vat move transformer", func() {
 		repository.SetMissingHeaders([]core.Header{headerOne, headerTwo})
 		repository.SetCheckedHeaderError(fakes.FakeError)
 		fetcher.SetFetchedLogs([]types.Log{})
-		transformer := vat_move.VatMoveTransformer{
-			Config:     config,
-			Converter:  &converter,
-			Fetcher:    &fetcher,
-			Repository: &repository,
-		}
 
 		err := transformer.Execute()
 
@@ -179,30 +144,18 @@ var _ = Describe("Vat move transformer", func() {
 	It("persists vat move model", func() {
 		fetcher.SetFetchedLogs([]types.Log{test_data.EthVatMoveLog})
 		repository.SetMissingHeaders([]core.Header{headerOne})
-		transformer := vat_move.VatMoveTransformer{
-			Config:     config,
-			Fetcher:    &fetcher,
-			Converter:  &converter,
-			Repository: &repository,
-		}
 
 		err := transformer.Execute()
 
 		Expect(err).NotTo(HaveOccurred())
 		Expect(repository.PassedHeaderID).To(Equal(headerOne.Id))
-		Expect(repository.PassedModels).To(Equal([]vat_move.VatMoveModel{test_data.VatMoveModel}))
+		Expect(repository.PassedModels).To(Equal([]interface{}{test_data.VatMoveModel}))
 	})
 
 	It("returns error if repository returns error for create", func() {
 		fetcher.SetFetchedLogs([]types.Log{test_data.EthVatMoveLog})
 		repository.SetMissingHeaders([]core.Header{headerOne})
 		repository.SetCreateError(fakes.FakeError)
-		transformer := vat_move.VatMoveTransformer{
-			Config:     config,
-			Fetcher:    &fetcher,
-			Converter:  &converter,
-			Repository: &repository,
-		}
 
 		err := transformer.Execute()