Frob transformer factory (#95)

* Updates to previous transformers

* Use transformer factory for Frob

* Move bite integration test to integrationt est pkg

pkg/transformers/bite/converter_test.go

@@ -59,6 +59,13 @@ var _ = Describe("Bite Converter", func() {
 			Expect(model).To(Equal(test_data.BiteModel))
 		})
 
+		It("returns an error if the entity type is wrong", func() {
+			_, err := converter.ToModels([]interface{}{test_data.WrongEntity{}})
+
+			Expect(err).To(HaveOccurred())
+			Expect(err.Error()).To(ContainSubstring("entity of type test_data.WrongEntity, not bite.BiteEntity"))
+		})
+
 		It("handles nil values", func() {
 			emptyLog, err := json.Marshal(types.Log{})
 			Expect(err).NotTo(HaveOccurred())

pkg/transformers/bite/integration_test.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 bite_test
-
-import (
-	"github.com/ethereum/go-ethereum/accounts/abi/bind"
-	"github.com/ethereum/go-ethereum/common"
-	"github.com/ethereum/go-ethereum/ethclient"
-	. "github.com/onsi/ginkgo"
-	. "github.com/onsi/gomega"
-
-	"github.com/ethereum/go-ethereum/rpc"
-	"github.com/vulcanize/vulcanizedb/pkg/geth"
-	"github.com/vulcanize/vulcanizedb/pkg/geth/client"
-	rpc2 "github.com/vulcanize/vulcanizedb/pkg/geth/converters/rpc"
-	"github.com/vulcanize/vulcanizedb/pkg/geth/node"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/bite"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/test_data"
-	"github.com/vulcanize/vulcanizedb/test_config"
-)
-
-var _ = Describe("Integration tests", func() {
-	XIt("Fetches bite event logs from a local test chain", func() {
-		ipcPath := test_config.TestClient.IPCPath
-
-		rawRpcClient, err := rpc.Dial(ipcPath)
-		Expect(err).NotTo(HaveOccurred())
-
-		rpcClient := client.NewRpcClient(rawRpcClient, ipcPath)
-		ethClient := ethclient.NewClient(rawRpcClient)
-		blockChainClient := client.NewEthClient(ethClient)
-		realNode := node.MakeNode(rpcClient)
-		transactionConverter := rpc2.NewRpcTransactionConverter(ethClient)
-		realBlockChain := geth.NewBlockChain(blockChainClient, rpcClient, realNode, transactionConverter)
-		realFetcher := shared.NewFetcher(realBlockChain)
-		topic0 := common.HexToHash(shared.BiteSignature)
-		topics := [][]common.Hash{{topic0}}
-
-		result, err := realFetcher.FetchLogs(bite.BiteConfig.ContractAddresses, topics, int64(26))
-		Expect(err).NotTo(HaveOccurred())
-
-		Expect(len(result) > 0).To(BeTrue())
-		Expect(result[0].Address).To(Equal(common.HexToAddress(shared.CatContractAddress)))
-		Expect(result[0].TxHash).To(Equal(test_data.EthBiteLog.TxHash))
-		Expect(result[0].BlockNumber).To(Equal(test_data.EthBiteLog.BlockNumber))
-		Expect(result[0].Topics).To(Equal(test_data.EthBiteLog.Topics))
-		Expect(result[0].Index).To(Equal(test_data.EthBiteLog.Index))
-	})
-
-	It("unpacks an event log", func() {
-		address := common.HexToAddress(shared.CatContractAddress)
-		abi, err := geth.ParseAbi(shared.CatABI)
-		Expect(err).NotTo(HaveOccurred())
-
-		contract := bind.NewBoundContract(address, abi, nil, nil, nil)
-		entity := &bite.BiteEntity{}
-
-		var eventLog = test_data.EthBiteLog
-
-		err = contract.UnpackLog(entity, "Bite", eventLog)
-		Expect(err).NotTo(HaveOccurred())
-
-		expectedEntity := test_data.BiteEntity
-		Expect(entity.Art).To(Equal(expectedEntity.Art))
-		Expect(entity.Ilk).To(Equal(expectedEntity.Ilk))
-		Expect(entity.Ink).To(Equal(expectedEntity.Ink))
-	})
-})

pkg/transformers/frob/config.go

@@ -16,10 +16,11 @@ package frob
 
 import "github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
 
-var FrobConfig = shared.TransformerConfig{
+var FrobConfig = shared.SingleTransformerConfig{
+	TransformerName:     shared.FrobLabel,
 	ContractAddresses:   []string{shared.PitContractAddress},
 	ContractAbi:         shared.PitABI,
-	Topics:              []string{shared.FrobSignature},
+	Topic:               shared.FrobSignature,
 	StartingBlockNumber: 0,
 	EndingBlockNumber:   10000000,
 }

pkg/transformers/frob/converter.go

@@ -15,24 +15,21 @@
 package frob
 
 import (
-	"github.com/ethereum/go-ethereum/accounts/abi/bind"
-	"github.com/ethereum/go-ethereum/core/types"
-
 	"bytes"
 	"encoding/json"
+	"fmt"
+
+	"github.com/ethereum/go-ethereum/accounts/abi/bind"
 	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/core/types"
+
 	"github.com/vulcanize/vulcanizedb/pkg/geth"
 )
 
-type Converter interface {
-	ToEntities(contractAbi string, ethLogs []types.Log) ([]FrobEntity, error)
-	ToModels(entities []FrobEntity) ([]FrobModel, error)
-}
-
 type FrobConverter struct{}
 
-func (FrobConverter) ToEntities(contractAbi string, ethLogs []types.Log) ([]FrobEntity, error) {
+func (FrobConverter) ToEntities(contractAbi string, ethLogs []types.Log) ([]interface{}, error) {
-	var entities []FrobEntity
+	var entities []interface{}
 	for _, ethLog := range ethLogs {
 		entity := FrobEntity{}
 		address := ethLog.Address
@@ -54,23 +51,28 @@ func (FrobConverter) ToEntities(contractAbi string, ethLogs []types.Log) ([]Frob
 	return entities, nil
 }
 
-func (FrobConverter) ToModels(entities []FrobEntity) ([]FrobModel, error) {
+func (FrobConverter) ToModels(entities []interface{}) ([]interface{}, error) {
-	var models []FrobModel
+	var models []interface{}
 	for _, entity := range entities {
-		rawLog, err := json.Marshal(entity.Raw)
+		frobEntity, ok := entity.(FrobEntity)
+		if !ok {
+			return nil, fmt.Errorf("entity of type %T, not %T", entity, FrobEntity{})
+		}
+
+		rawLog, err := json.Marshal(frobEntity.Raw)
 		if err != nil {
 			return nil, err
 		}
 		model := FrobModel{
-			Ilk:              string(bytes.Trim(entity.Ilk[:], "\x00)")),
+			Ilk:              string(bytes.Trim(frobEntity.Ilk[:], "\x00)")),
-			Urn:              common.BytesToAddress(entity.Urn[:]).String(),
+			Urn:              common.BytesToAddress(frobEntity.Urn[:]).String(),
-			Ink:              entity.Ink.String(),
+			Ink:              frobEntity.Ink.String(),
-			Art:              entity.Art.String(),
+			Art:              frobEntity.Art.String(),
-			Dink:             entity.Dink.String(),
+			Dink:             frobEntity.Dink.String(),
-			Dart:             entity.Dart.String(),
+			Dart:             frobEntity.Dart.String(),
-			IArt:             entity.IArt.String(),
+			IArt:             frobEntity.IArt.String(),
-			LogIndex:         entity.LogIndex,
+			LogIndex:         frobEntity.LogIndex,
-			TransactionIndex: entity.TransactionIndex,
+			TransactionIndex: frobEntity.TransactionIndex,
 			Raw:              rawLog,
 		}
 		models = append(models, model)

pkg/transformers/frob/converter_test.go

@@ -25,9 +25,8 @@ import (
 )
 
 var _ = Describe("Frob converter", func() {
+	var converter = frob.FrobConverter{}
 	It("converts a log to an entity", func() {
-		converter := frob.FrobConverter{}
-
 		entities, err := converter.ToEntities(shared.PitABI, []types.Log{test_data.EthFrobLog})
 
 		Expect(err).NotTo(HaveOccurred())
@@ -35,13 +34,24 @@ var _ = Describe("Frob converter", func() {
 		Expect(entities[0]).To(Equal(test_data.FrobEntity))
 	})
 
-	It("converts an entity to a model", func() {
+	It("returns an error if converting to an entity fails", func() {
-		converter := frob.FrobConverter{}
+		_, err := converter.ToEntities("bad abi", []types.Log{test_data.EthFrobLog})
 
-		models, err := converter.ToModels([]frob.FrobEntity{test_data.FrobEntity})
+		Expect(err).To(HaveOccurred())
+	})
+
+	It("converts an entity to a model", func() {
+		models, err := converter.ToModels([]interface{}{test_data.FrobEntity})
 
 		Expect(err).NotTo(HaveOccurred())
 		Expect(len(models)).To(Equal(1))
 		Expect(models[0]).To(Equal(test_data.FrobModel))
 	})
+
+	It("returns an error if the entity type is wrong", func() {
+		_, err := converter.ToModels([]interface{}{test_data.WrongEntity{}})
+
+		Expect(err).To(HaveOccurred())
+		Expect(err.Error()).To(ContainSubstring("entity of type test_data.WrongEntity, not frob.FrobEntity"))
+	})
 })

pkg/transformers/frob/repository.go

@@ -15,33 +15,30 @@
 package frob
 
 import (
+	"fmt"
+
 	"github.com/vulcanize/vulcanizedb/pkg/core"
 	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
 )
 
-type Repository interface {
-	Create(headerID int64, models []FrobModel) error
-	MarkHeaderChecked(headerID int64) error
-	MissingHeaders(startingBlockNumber, endingBlockNumber int64) ([]core.Header, error)
-}
-
 type FrobRepository struct {
 	db *postgres.DB
 }
 
-func NewFrobRepository(db *postgres.DB) FrobRepository {
+func (repository FrobRepository) Create(headerID int64, models []interface{}) error {
-	return FrobRepository{db: db}
-}
-
-func (repository FrobRepository) Create(headerID int64, models []FrobModel) error {
 	tx, err := repository.db.Begin()
 	if err != nil {
 		return err
 	}
 	for _, model := range models {
+		frobModel, ok := model.(FrobModel)
+		if !ok {
+			tx.Rollback()
+			return fmt.Errorf("model of type %T, not %T", model, FrobModel{})
+		}
 		_, err = tx.Exec(`INSERT INTO maker.frob (header_id, art, dart, dink, iart, ilk, ink, urn, raw_log, log_idx, tx_idx)
 		VALUES($1, $2::NUMERIC, $3::NUMERIC, $4::NUMERIC, $5::NUMERIC, $6, $7::NUMERIC, $8, $9, $10, $11)`,
-			headerID, model.Art, model.Dart, model.Dink, model.IArt, model.Ilk, model.Ink, model.Urn, model.Raw, model.LogIndex, model.TransactionIndex)
+			headerID, frobModel.Art, frobModel.Dart, frobModel.Dink, frobModel.IArt, frobModel.Ilk, frobModel.Ink, frobModel.Urn, frobModel.Raw, frobModel.LogIndex, frobModel.TransactionIndex)
 		if err != nil {
 			tx.Rollback()
 			return err
@@ -82,3 +79,7 @@ func (repository FrobRepository) MissingHeaders(startingBlockNumber, endingBlock
 	)
 	return result, err
 }
+
+func (repository *FrobRepository) SetDB(db *postgres.DB) {
+	repository.db = db
+}

pkg/transformers/frob/repository_test.go

@@ -33,7 +33,7 @@ import (
 var _ = Describe("Frob repository", func() {
 	var (
 		db               *postgres.DB
-		frobRepository   frob.Repository
+		frobRepository   frob.FrobRepository
 		err              error
 		headerRepository datastore.HeaderRepository
 	)
@@ -42,7 +42,8 @@ var _ = Describe("Frob repository", func() {
 		db = test_config.NewTestDB(core.Node{})
 		test_config.CleanTestDB(db)
 		headerRepository = repositories.NewHeaderRepository(db)
-		frobRepository = frob.NewFrobRepository(db)
+		frobRepository = frob.FrobRepository{}
+		frobRepository.SetDB(db)
 	})
 
 	Describe("Create", func() {
@@ -54,7 +55,7 @@ var _ = Describe("Frob repository", func() {
 		})
 
 		It("adds a frob", func() {
-			err = frobRepository.Create(headerID, []frob.FrobModel{test_data.FrobModel})
+			err = frobRepository.Create(headerID, []interface{}{test_data.FrobModel})
 
 			Expect(err).NotTo(HaveOccurred())
 			var dbFrob frob.FrobModel
@@ -73,7 +74,7 @@ var _ = Describe("Frob repository", func() {
 		})
 
 		It("marks header as checked for logs", func() {
-			err = frobRepository.Create(headerID, []frob.FrobModel{test_data.FrobModel})
+			err = frobRepository.Create(headerID, []interface{}{test_data.FrobModel})
 
 			Expect(err).NotTo(HaveOccurred())
 			var headerChecked bool
@@ -86,7 +87,7 @@ var _ = Describe("Frob repository", func() {
 			_, err = db.Exec(`INSERT INTO public.checked_headers (header_id) VALUES ($1)`, headerID)
 			Expect(err).NotTo(HaveOccurred())
 
-			err = frobRepository.Create(headerID, []frob.FrobModel{test_data.FrobModel})
+			err = frobRepository.Create(headerID, []interface{}{test_data.FrobModel})
 
 			Expect(err).NotTo(HaveOccurred())
 			var headerChecked bool
@@ -96,17 +97,23 @@ var _ = Describe("Frob repository", func() {
 		})
 
 		It("does not duplicate frob events", func() {
-			err = frobRepository.Create(headerID, []frob.FrobModel{test_data.FrobModel})
+			err = frobRepository.Create(headerID, []interface{}{test_data.FrobModel})
 			Expect(err).NotTo(HaveOccurred())
 
-			err = frobRepository.Create(headerID, []frob.FrobModel{test_data.FrobModel})
+			err = frobRepository.Create(headerID, []interface{}{test_data.FrobModel})
 
 			Expect(err).To(HaveOccurred())
 			Expect(err.Error()).To(ContainSubstring("pq: duplicate key value violates unique constraint"))
 		})
 
+		It("returns an error if the wrong model type is passed in", func() {
+			err = frobRepository.Create(headerID, []interface{}{test_data.WrongModel{}})
+			Expect(err).To(HaveOccurred())
+			Expect(err.Error()).To(ContainSubstring("model of type test_data.WrongModel, not frob.FrobModel"))
+		})
+
 		It("removes frob if corresponding header is deleted", func() {
-			err = frobRepository.Create(headerID, []frob.FrobModel{test_data.FrobModel})
+			err = frobRepository.Create(headerID, []interface{}{test_data.FrobModel})
 			Expect(err).NotTo(HaveOccurred())
 
 			_, err = db.Exec(`DELETE FROM headers WHERE id = $1`, headerID)
@@ -203,7 +210,8 @@ var _ = Describe("Frob repository", func() {
 				_, err = headerRepositoryTwo.CreateOrUpdateHeader(fakes.GetFakeHeader(n))
 				Expect(err).NotTo(HaveOccurred())
 			}
-			frobRepositoryTwo := frob.NewFrobRepository(dbTwo)
+			frobRepositoryTwo := frob.FrobRepository{}
+			frobRepositoryTwo.SetDB(dbTwo)
 			err := frobRepository.MarkHeaderChecked(headerIDs[0])
 			Expect(err).NotTo(HaveOccurred())
 

pkg/transformers/frob/transformer.go

@@ -1,82 +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 frob
-
-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 FrobTransformer struct {
-	Config     shared.TransformerConfig
-	Converter  Converter
-	Fetcher    shared.LogFetcher
-	Repository Repository
-}
-
-type FrobTransformerInitializer struct {
-	Config shared.TransformerConfig
-}
-
-func (initializer FrobTransformerInitializer) NewFrobTransformer(db *postgres.DB, blockChain core.BlockChain) shared.Transformer {
-	converter := FrobConverter{}
-	fetcher := shared.NewFetcher(blockChain)
-	repository := NewFrobRepository(db)
-	return FrobTransformer{
-		Config:     initializer.Config,
-		Converter:  converter,
-		Fetcher:    fetcher,
-		Repository: repository,
-	}
-}
-
-func (transformer FrobTransformer) Execute() error {
-	missingHeaders, err := transformer.Repository.MissingHeaders(transformer.Config.StartingBlockNumber, transformer.Config.EndingBlockNumber)
-	if err != nil {
-		return err
-	}
-	log.Printf("Fetching frob event logs for %d headers \n", len(missingHeaders))
-	for _, header := range missingHeaders {
-		topics := [][]common.Hash{{common.HexToHash(shared.FrobSignature)}}
-		matchingLogs, err := transformer.Fetcher.FetchLogs(FrobConfig.ContractAddresses, topics, header.BlockNumber)
-		if err != nil {
-			return err
-		}
-		if len(matchingLogs) < 1 {
-			err = transformer.Repository.MarkHeaderChecked(header.Id)
-			if err != nil {
-				return err
-			}
-		}
-		entities, err := transformer.Converter.ToEntities(FrobConfig.ContractAbi, matchingLogs)
-		if err != nil {
-			return err
-		}
-		models, err := transformer.Converter.ToModels(entities)
-		if err != nil {
-			return err
-		}
-		err = transformer.Repository.Create(header.Id, models)
-		if err != nil {
-			return err
-		}
-	}
-	return nil
-}

pkg/transformers/frob/transformer_test.go

@@ -15,30 +15,41 @@
 package frob_test
 
 import (
-	"github.com/ethereum/go-ethereum/common"
-	"github.com/ethereum/go-ethereum/core/types"
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
 
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/core/types"
 	"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/frob"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/test_data"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/test_data/mocks"
-	frob_mocks "github.com/vulcanize/vulcanizedb/pkg/transformers/test_data/mocks/frob"
 )
 
 var _ = Describe("Frob transformer", func() {
-	It("gets missing headers for block numbers specified in config", func() {
+	var (
-		repository := &frob_mocks.MockFrobRepository{}
+		repository  mocks.MockRepository
-		transformer := frob.FrobTransformer{
+		transformer shared.Transformer
-			Config:     frob.FrobConfig,
+		fetcher     mocks.MockLogFetcher
-			Fetcher:    &mocks.MockLogFetcher{},
+		converter   mocks.MockConverter
-			Converter:  &frob_mocks.MockFrobConverter{},
+		config      = frob.FrobConfig
-			Repository: repository,
+	)
-		}
+	BeforeEach(func() {
+		repository = mocks.MockRepository{}
+		fetcher = mocks.MockLogFetcher{}
+		converter = mocks.MockConverter{}
+		transformer = factories.Transformer{
+			Config:     config,
+			Fetcher:    &fetcher,
+			Converter:  &converter,
+			Repository: &repository,
+		}.NewTransformer(nil, nil)
+	})
 
+	It("gets missing headers for block numbers specified in config", func() {
 		err := transformer.Execute()
 
 		Expect(err).NotTo(HaveOccurred())
@@ -47,13 +58,7 @@ var _ = Describe("Frob transformer", func() {
 	})
 
 	It("returns error if repository returns error for missing headers", func() {
-		repository := &frob_mocks.MockFrobRepository{}
+		repository.SetMissingHeadersError(fakes.FakeError)
-		repository.SetMissingHeadersErr(fakes.FakeError)
-		transformer := frob.FrobTransformer{
-			Fetcher:    &mocks.MockLogFetcher{},
-			Converter:  &frob_mocks.MockFrobConverter{},
-			Repository: repository,
-		}
 
 		err := transformer.Execute()
 
@@ -62,14 +67,7 @@ var _ = Describe("Frob transformer", func() {
 	})
 
 	It("fetches logs for missing headers", func() {
-		fetcher := &mocks.MockLogFetcher{}
-		repository := &frob_mocks.MockFrobRepository{}
 		repository.SetMissingHeaders([]core.Header{{BlockNumber: 1}, {BlockNumber: 2}})
-		transformer := frob.FrobTransformer{
-			Fetcher:    fetcher,
-			Converter:  &frob_mocks.MockFrobConverter{},
-			Repository: repository,
-		}
 
 		err := transformer.Execute()
 
@@ -80,15 +78,8 @@ var _ = Describe("Frob transformer", func() {
 	})
 
 	It("returns error if fetcher returns error", func() {
-		fetcher := &mocks.MockLogFetcher{}
 		fetcher.SetFetcherError(fakes.FakeError)
-		repository := &frob_mocks.MockFrobRepository{}
 		repository.SetMissingHeaders([]core.Header{{BlockNumber: 1}})
-		transformer := frob.FrobTransformer{
-			Fetcher:    fetcher,
-			Converter:  &frob_mocks.MockFrobConverter{},
-			Repository: repository,
-		}
 
 		err := transformer.Execute()
 
@@ -97,34 +88,18 @@ var _ = Describe("Frob transformer", func() {
 	})
 
 	It("marks header checked if no logs returned", func() {
-		mockConverter := &frob_mocks.MockFrobConverter{}
-		mockRepository := &frob_mocks.MockFrobRepository{}
 		headerID := int64(123)
-		mockRepository.SetMissingHeaders([]core.Header{{Id: headerID}})
+		repository.SetMissingHeaders([]core.Header{{Id: headerID}})
-		mockFetcher := &mocks.MockLogFetcher{}
-		transformer := frob.FrobTransformer{
-			Converter:  mockConverter,
-			Fetcher:    mockFetcher,
-			Repository: mockRepository,
-		}
 
 		err := transformer.Execute()
 
 		Expect(err).NotTo(HaveOccurred())
-		mockRepository.AssertMarkHeaderCheckedCalledWith(headerID)
+		repository.AssertMarkHeaderCheckedCalledWith(headerID)
 	})
 
 	It("returns error if marking header checked returns err", func() {
-		mockConverter := &frob_mocks.MockFrobConverter{}
+		repository.SetMissingHeaders([]core.Header{{Id: int64(123)}})
-		mockRepository := &frob_mocks.MockFrobRepository{}
+		repository.SetMarkHeaderCheckedError(fakes.FakeError)
-		mockRepository.SetMissingHeaders([]core.Header{{Id: int64(123)}})
-		mockRepository.SetMarkHeaderCheckedErr(fakes.FakeError)
-		mockFetcher := &mocks.MockLogFetcher{}
-		transformer := frob.FrobTransformer{
-			Converter:  mockConverter,
-			Fetcher:    mockFetcher,
-			Repository: mockRepository,
-		}
 
 		err := transformer.Execute()
 
@@ -133,36 +108,20 @@ var _ = Describe("Frob transformer", func() {
 	})
 
 	It("converts matching logs to entity", func() {
-		converter := &frob_mocks.MockFrobConverter{}
-		fetcher := &mocks.MockLogFetcher{}
 		fetcher.SetFetchedLogs([]types.Log{test_data.EthFrobLog})
-		repository := &frob_mocks.MockFrobRepository{}
 		repository.SetMissingHeaders([]core.Header{{BlockNumber: 1}})
-		transformer := frob.FrobTransformer{
-			Fetcher:    fetcher,
-			Converter:  converter,
-			Repository: repository,
-		}
 
 		err := transformer.Execute()
 
 		Expect(err).NotTo(HaveOccurred())
-		Expect(converter.PassedContractABI).To(Equal(frob.FrobConfig.ContractAbi))
+		Expect(converter.ContractAbi).To(Equal(frob.FrobConfig.ContractAbi))
-		Expect(converter.PassedLogs).To(Equal([]types.Log{test_data.EthFrobLog}))
+		Expect(converter.LogsToConvert).To(Equal([]types.Log{test_data.EthFrobLog}))
 	})
 
 	It("returns error if converting to entity returns error", func() {
-		converter := &frob_mocks.MockFrobConverter{}
+		converter.ToEntitiesError = fakes.FakeError
-		converter.SetToEntitiesError(fakes.FakeError)
-		fetcher := &mocks.MockLogFetcher{}
 		fetcher.SetFetchedLogs([]types.Log{test_data.EthFrobLog})
-		repository := &frob_mocks.MockFrobRepository{}
 		repository.SetMissingHeaders([]core.Header{{BlockNumber: 1}})
-		transformer := frob.FrobTransformer{
-			Fetcher:    fetcher,
-			Converter:  converter,
-			Repository: repository,
-		}
 
 		err := transformer.Execute()
 
@@ -171,35 +130,20 @@ var _ = Describe("Frob transformer", func() {
 	})
 
 	It("converts frob entity to model", func() {
-		converter := &frob_mocks.MockFrobConverter{}
+		converter.EntitiesToReturn = []interface{}{test_data.FrobEntity}
-		fetcher := &mocks.MockLogFetcher{}
 		fetcher.SetFetchedLogs([]types.Log{test_data.EthFrobLog})
-		repository := &frob_mocks.MockFrobRepository{}
 		repository.SetMissingHeaders([]core.Header{{BlockNumber: 1}})
-		transformer := frob.FrobTransformer{
-			Fetcher:    fetcher,
-			Converter:  converter,
-			Repository: repository,
-		}
 
 		err := transformer.Execute()
 
 		Expect(err).NotTo(HaveOccurred())
-		Expect(converter.PassedEntities).To(Equal([]frob.FrobEntity{test_data.FrobEntity}))
+		Expect(converter.EntitiesToConvert[0]).To(Equal(test_data.FrobEntity))
 	})
 
 	It("returns error if converting to model returns error", func() {
-		converter := &frob_mocks.MockFrobConverter{}
+		converter.ToModelsError = fakes.FakeError
-		converter.SetToModelsError(fakes.FakeError)
-		fetcher := &mocks.MockLogFetcher{}
 		fetcher.SetFetchedLogs([]types.Log{test_data.EthFrobLog})
-		repository := &frob_mocks.MockFrobRepository{}
 		repository.SetMissingHeaders([]core.Header{{BlockNumber: 1}})
-		transformer := frob.FrobTransformer{
-			Fetcher:    fetcher,
-			Converter:  converter,
-			Repository: repository,
-		}
 
 		err := transformer.Execute()
 
@@ -208,37 +152,22 @@ var _ = Describe("Frob transformer", func() {
 	})
 
 	It("persists frob model", func() {
-		converter := &frob_mocks.MockFrobConverter{}
+		converter.ModelsToReturn = []interface{}{test_data.FrobModel}
-		fetcher := &mocks.MockLogFetcher{}
 		fetcher.SetFetchedLogs([]types.Log{test_data.EthFrobLog})
-		repository := &frob_mocks.MockFrobRepository{}
 		fakeHeader := core.Header{BlockNumber: 1, Id: 2}
 		repository.SetMissingHeaders([]core.Header{fakeHeader})
-		transformer := frob.FrobTransformer{
-			Fetcher:    fetcher,
-			Converter:  converter,
-			Repository: repository,
-		}
 
 		err := transformer.Execute()
 
 		Expect(err).NotTo(HaveOccurred())
 		Expect(repository.PassedHeaderID).To(Equal(fakeHeader.Id))
-		Expect(repository.PassedModels).To(Equal([]frob.FrobModel{test_data.FrobModel}))
+		Expect(repository.PassedModels[0]).To(Equal(test_data.FrobModel))
 	})
 
 	It("returns error if repository returns error for create", func() {
-		converter := &frob_mocks.MockFrobConverter{}
-		fetcher := &mocks.MockLogFetcher{}
 		fetcher.SetFetchedLogs([]types.Log{test_data.EthFrobLog})
-		repository := &frob_mocks.MockFrobRepository{}
 		repository.SetMissingHeaders([]core.Header{{BlockNumber: 1, Id: 2}})
 		repository.SetCreateError(fakes.FakeError)
-		transformer := frob.FrobTransformer{
-			Fetcher:    fetcher,
-			Converter:  converter,
-			Repository: repository,
-		}
 
 		err := transformer.Execute()
 

pkg/transformers/integration_tests/bite.go

@@ -18,9 +18,13 @@ import (
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
 
+	"github.com/ethereum/go-ethereum/accounts/abi/bind"
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/vulcanize/vulcanizedb/pkg/geth"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/bite"
 	"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/test_config"
 )
 
@@ -65,4 +69,23 @@ var _ = Describe("Bite Transformer", func() {
 		Expect(dbResult[0].Tab).To(Equal("149846666666666655744"))
 		Expect(dbResult[0].Urn).To(Equal("0x0000d8b4147eDa80Fec7122AE16DA2479Cbd7ffB"))
 	})
+
+	It("unpacks an event log", func() {
+		address := common.HexToAddress(shared.CatContractAddress)
+		abi, err := geth.ParseAbi(shared.CatABI)
+		Expect(err).NotTo(HaveOccurred())
+
+		contract := bind.NewBoundContract(address, abi, nil, nil, nil)
+		entity := &bite.BiteEntity{}
+
+		var eventLog = test_data.EthBiteLog
+
+		err = contract.UnpackLog(entity, "Bite", eventLog)
+		Expect(err).NotTo(HaveOccurred())
+
+		expectedEntity := test_data.BiteEntity
+		Expect(entity.Art).To(Equal(expectedEntity.Art))
+		Expect(entity.Ilk).To(Equal(expectedEntity.Ilk))
+		Expect(entity.Ink).To(Equal(expectedEntity.Ink))
+	})
 })

pkg/transformers/integration_tests/frob.go

@@ -21,6 +21,7 @@ import (
 	. "github.com/onsi/gomega"
 
 	"github.com/vulcanize/vulcanizedb/pkg/geth"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/factories"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/frob"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/test_data"
@@ -45,8 +46,13 @@ var _ = Describe("Frob Transformer", func() {
 		err = persistHeader(db, blockNumber)
 		Expect(err).NotTo(HaveOccurred())
 
-		initializer := frob.FrobTransformerInitializer{Config: config}
+		initializer := factories.Transformer{
-		transformer := initializer.NewFrobTransformer(db, blockchain)
+			Config:     frob.FrobConfig,
+			Converter:  &frob.FrobConverter{},
+			Repository: &frob.FrobRepository{},
+			Fetcher:    &shared.Fetcher{},
+		}
+		transformer := initializer.NewTransformer(db, blockchain)
 		err = transformer.Execute()
 		Expect(err).NotTo(HaveOccurred())
 

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

@@ -1,49 +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 frob
-
-import (
-	"github.com/ethereum/go-ethereum/core/types"
-
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/frob"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/test_data"
-)
-
-type MockFrobConverter struct {
-	PassedContractABI string
-	PassedLogs        []types.Log
-	PassedEntities    []frob.FrobEntity
-	toEntityError     error
-	toModelError      error
-}
-
-func (converter *MockFrobConverter) SetToEntitiesError(err error) {
-	converter.toEntityError = err
-}
-
-func (converter *MockFrobConverter) SetToModelsError(err error) {
-	converter.toModelError = err
-}
-
-func (converter *MockFrobConverter) ToEntities(contractAbi string, ethLogs []types.Log) ([]frob.FrobEntity, error) {
-	converter.PassedContractABI = contractAbi
-	converter.PassedLogs = ethLogs
-	return []frob.FrobEntity{test_data.FrobEntity}, converter.toEntityError
-}
-
-func (converter *MockFrobConverter) ToModels(frobEntities []frob.FrobEntity) ([]frob.FrobModel, error) {
-	converter.PassedEntities = frobEntities
-	return []frob.FrobModel{test_data.FrobModel}, converter.toModelError
-}

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

@@ -1,70 +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 frob
-
-import (
-	. "github.com/onsi/gomega"
-
-	"github.com/vulcanize/vulcanizedb/pkg/core"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/frob"
-)
-
-type MockFrobRepository struct {
-	createError                     error
-	PassedEndingBlockNumber         int64
-	PassedModels                    []frob.FrobModel
-	PassedHeaderID                  int64
-	PassedStartingBlockNumber       int64
-	markHeaderCheckedErr            error
-	markHeaderCheckedPassedHeaderID int64
-	missingHeaders                  []core.Header
-	missingHeadersErr               error
-}
-
-func (repository *MockFrobRepository) SetCreateError(err error) {
-	repository.createError = err
-}
-
-func (repository *MockFrobRepository) SetMarkHeaderCheckedErr(e error) {
-	repository.markHeaderCheckedErr = e
-}
-
-func (repository *MockFrobRepository) SetMissingHeadersErr(err error) {
-	repository.missingHeadersErr = err
-}
-
-func (repository *MockFrobRepository) SetMissingHeaders(headers []core.Header) {
-	repository.missingHeaders = headers
-}
-
-func (repository *MockFrobRepository) Create(headerID int64, models []frob.FrobModel) error {
-	repository.PassedHeaderID = headerID
-	repository.PassedModels = models
-	return repository.createError
-}
-
-func (repository *MockFrobRepository) MarkHeaderChecked(headerID int64) error {
-	repository.markHeaderCheckedPassedHeaderID = headerID
-	return repository.markHeaderCheckedErr
-}
-
-func (repository *MockFrobRepository) MissingHeaders(startingBlockNumber, endingBlockNumber int64) ([]core.Header, error) {
-	repository.PassedStartingBlockNumber = startingBlockNumber
-	repository.PassedEndingBlockNumber = endingBlockNumber
-	return repository.missingHeaders, repository.missingHeadersErr
-}
-func (repository *MockFrobRepository) AssertMarkHeaderCheckedCalledWith(i int64) {
-	Expect(repository.markHeaderCheckedPassedHeaderID).To(Equal(i))
-}

pkg/transformers/test_data/wrong_types.go

@@ -14,4 +14,5 @@
 
 package test_data
 
+type WrongEntity struct{}
 type WrongModel struct{}

pkg/transformers/transformers.go

@@ -126,8 +126,15 @@ var (
 		Fetcher:    &shared.Fetcher{},
 	}.NewLogNoteTransformer
 
-	FlopKickTransformerInitializer           = flop_kick.FlopKickTransformerInitializer{Config: flop_kick.Config}.NewFlopKickTransformer
+	FlopKickTransformerInitializer = flop_kick.FlopKickTransformerInitializer{Config: flop_kick.Config}.NewFlopKickTransformer
-	FrobTransformerInitializer               = frob.FrobTransformerInitializer{Config: frob.FrobConfig}.NewFrobTransformer
+
+	FrobTransformerInitializer = factories.Transformer{
+		Config:     frob.FrobConfig,
+		Converter:  &frob.FrobConverter{},
+		Repository: &frob.FrobRepository{},
+		Fetcher:    &shared.Fetcher{},
+	}.NewTransformer
+
 	PitFileDebtCeilingTransformerInitializer = factories.LogNoteTransformer{
 		Config:     debt_ceiling.DebtCeilingFileConfig,
 		Converter:  &debt_ceiling.PitFileDebtCeilingConverter{},