Add Vat toll transformer

2018-10-09 11:40:35 -05:00
parent 300da63724
commit 8ee106e14d
19 changed files with 866 additions and 1 deletions
@@ -0,0 +1,11 @@
+package vat_toll
+
+import "github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
+
+var VatTollConfig = shared.TransformerConfig{
+	ContractAddresses:   []string{shared.VatContractAddress},
+	ContractAbi:         shared.VatABI,
+	Topics:              []string{shared.VatTollSignature},
+	StartingBlockNumber: 0,
+	EndingBlockNumber:   10000000,
+}
@@ -0,0 +1,51 @@
+package vat_toll
+
+import (
+	"bytes"
+	"encoding/json"
+	"errors"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/core/types"
+)
+
+type Converter interface {
+	ToModels(ethLogs []types.Log) ([]VatTollModel, error)
+}
+
+type VatTollConverter struct{}
+
+func (VatTollConverter) ToModels(ethLogs []types.Log) ([]VatTollModel, error) {
+	var models []VatTollModel
+	for _, ethLog := range ethLogs {
+		err := verifyLog(ethLog)
+		if err != nil {
+			return nil, err
+		}
+		ilk := string(bytes.Trim(ethLog.Topics[1].Bytes(), "\x00"))
+		urn := common.BytesToAddress(ethLog.Topics[2].Bytes()[:common.AddressLength])
+		take := ethLog.Topics[3].Big()
+
+		raw, err := json.Marshal(ethLog)
+		if err != nil {
+			return nil, err
+		}
+		model := VatTollModel{
+			Ilk:              ilk,
+			Urn:              urn.String(),
+			Take:             take.String(),
+			TransactionIndex: ethLog.TxIndex,
+			Raw:              raw,
+		}
+		models = append(models, model)
+	}
+	return models, nil
+}
+
+func verifyLog(log types.Log) error {
+	numTopicInValidLog := 4
+	if len(log.Topics) < numTopicInValidLog {
+		return errors.New("log missing topics")
+	}
+	return nil
+}
@@ -0,0 +1,33 @@
+package vat_toll_test
+
+import (
+	"github.com/ethereum/go-ethereum/core/types"
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/test_data"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/vat_toll"
+)
+
+var _ = Describe("Vat toll converter", func() {
+	It("returns err if log is missing topics", func() {
+		converter := vat_toll.VatTollConverter{}
+		badLog := types.Log{
+			Data: []byte{1, 1, 1, 1, 1},
+		}
+
+		_, err := converter.ToModels([]types.Log{badLog})
+
+		Expect(err).To(HaveOccurred())
+	})
+
+	It("converts a log to an model", func() {
+		converter := vat_toll.VatTollConverter{}
+
+		models, err := converter.ToModels([]types.Log{test_data.EthVatTollLog})
+
+		Expect(err).NotTo(HaveOccurred())
+		Expect(len(models)).To(Equal(1))
+		Expect(models[0]).To(Equal(test_data.VatTollModel))
+	})
+})
@@ -0,0 +1,9 @@
+package vat_toll
+
+type VatTollModel struct {
+	Ilk              string
+	Urn              string
+	Take             string
+	TransactionIndex uint   `db:"tx_idx"`
+	Raw              []byte `db:"raw_log"`
+}
@@ -0,0 +1,74 @@
+package vat_toll
+
+import (
+	"github.com/vulcanize/vulcanizedb/pkg/core"
+	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
+)
+
+type Repository interface {
+	Create(headerID int64, models []VatTollModel) error
+	MarkHeaderChecked(headerID int64) error
+	MissingHeaders(startingBlockNumber, endingBlockNumber int64) ([]core.Header, error)
+}
+
+type VatTollRepository struct {
+	db *postgres.DB
+}
+
+func NewVatTollRepository(db *postgres.DB) VatTollRepository {
+	return VatTollRepository{
+		db: db,
+	}
+}
+
+func (repository VatTollRepository) Create(headerID int64, models []VatTollModel) error {
+	tx, err := repository.db.Begin()
+	if err != nil {
+		return err
+	}
+	for _, model := range models {
+		_, err = tx.Exec(
+			`INSERT into maker.vat_toll (header_id, ilk, urn, take, tx_idx, raw_log)
+        VALUES($1, $2, $3, $4::NUMERIC, $5, $6)`,
+			headerID, model.Ilk, model.Urn, model.Take, model.TransactionIndex, model.Raw,
+		)
+		if err != nil {
+			tx.Rollback()
+			return err
+		}
+	}
+	_, err = tx.Exec(`INSERT INTO public.checked_headers (header_id, vat_toll_checked)
+		VALUES ($1, $2)
+	ON CONFLICT (header_id) DO
+		UPDATE SET vat_toll_checked = $2`, headerID, true)
+	if err != nil {
+		tx.Rollback()
+		return err
+	}
+	return tx.Commit()
+}
+
+func (repository VatTollRepository) MarkHeaderChecked(headerID int64) error {
+	_, err := repository.db.Exec(`INSERT INTO public.checked_headers (header_id, vat_toll_checked)
+		VALUES ($1, $2)
+	ON CONFLICT (header_id) DO
+		UPDATE SET vat_toll_checked = $2`, headerID, true)
+	return err
+}
+
+func (repository VatTollRepository) MissingHeaders(startingBlockNumber, endingBlockNumber int64) ([]core.Header, error) {
+	var result []core.Header
+	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 vat_toll_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
+}
@@ -0,0 +1,206 @@
+package vat_toll_test
+
+import (
+	"database/sql"
+
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+
+	"github.com/vulcanize/vulcanizedb/pkg/core"
+	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
+	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres/repositories"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/test_data"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/vat_toll"
+	"github.com/vulcanize/vulcanizedb/test_config"
+)
+
+var _ = Describe("Vat toll repository", func() {
+	Describe("Create", func() {
+		var (
+			db                *postgres.DB
+			vatTollRepository vat_toll.Repository
+			err               error
+			headerID          int64
+		)
+
+		BeforeEach(func() {
+			db = test_config.NewTestDB(core.Node{})
+			test_config.CleanTestDB(db)
+			headerRepository := repositories.NewHeaderRepository(db)
+			headerID, err = headerRepository.CreateOrUpdateHeader(core.Header{})
+			Expect(err).NotTo(HaveOccurred())
+			vatTollRepository = vat_toll.NewVatTollRepository(db)
+		})
+
+		It("adds a vat toll event", func() {
+			err = vatTollRepository.Create(headerID, []vat_toll.VatTollModel{test_data.VatTollModel})
+
+			Expect(err).NotTo(HaveOccurred())
+			var dbVatToll vat_toll.VatTollModel
+			err = db.Get(&dbVatToll, `SELECT ilk, urn, take, tx_idx, raw_log FROM maker.vat_toll WHERE header_id = $1`, headerID)
+			Expect(err).NotTo(HaveOccurred())
+			Expect(dbVatToll.Ilk).To(Equal(test_data.VatTollModel.Ilk))
+			Expect(dbVatToll.Urn).To(Equal(test_data.VatTollModel.Urn))
+			Expect(dbVatToll.Take).To(Equal(test_data.VatTollModel.Take))
+			Expect(dbVatToll.TransactionIndex).To(Equal(test_data.VatTollModel.TransactionIndex))
+			Expect(dbVatToll.Raw).To(MatchJSON(test_data.VatTollModel.Raw))
+		})
+
+		It("marks header as checked for logs", func() {
+			err = vatTollRepository.Create(headerID, []vat_toll.VatTollModel{test_data.VatTollModel})
+
+			Expect(err).NotTo(HaveOccurred())
+			var headerChecked bool
+			err = db.Get(&headerChecked, `SELECT vat_toll_checked FROM public.checked_headers WHERE header_id = $1`, headerID)
+			Expect(err).NotTo(HaveOccurred())
+			Expect(headerChecked).To(BeTrue())
+		})
+
+		It("does not duplicate vat toll events", func() {
+			err = vatTollRepository.Create(headerID, []vat_toll.VatTollModel{test_data.VatTollModel})
+			Expect(err).NotTo(HaveOccurred())
+
+			err = vatTollRepository.Create(headerID, []vat_toll.VatTollModel{test_data.VatTollModel})
+
+			Expect(err).To(HaveOccurred())
+			Expect(err.Error()).To(ContainSubstring("pq: duplicate key value violates unique constraint"))
+		})
+
+		It("removes vat toll if corresponding header is deleted", func() {
+			err = vatTollRepository.Create(headerID, []vat_toll.VatTollModel{test_data.VatTollModel})
+			Expect(err).NotTo(HaveOccurred())
+
+			_, err = db.Exec(`DELETE FROM headers WHERE id = $1`, headerID)
+
+			Expect(err).NotTo(HaveOccurred())
+			var dbVatToll vat_toll.VatTollModel
+			err = db.Get(&dbVatToll, `SELECT ilk, urn, take, tx_idx, raw_log FROM maker.vat_toll WHERE header_id = $1`, headerID)
+			Expect(err).To(HaveOccurred())
+			Expect(err).To(MatchError(sql.ErrNoRows))
+		})
+	})
+
+	Describe("MarkHeaderChecked", func() {
+		var (
+			db                *postgres.DB
+			vatTollRepository vat_toll.Repository
+			err               error
+			headerID          int64
+		)
+
+		BeforeEach(func() {
+			db = test_config.NewTestDB(core.Node{})
+			test_config.CleanTestDB(db)
+			headerRepository := repositories.NewHeaderRepository(db)
+			headerID, err = headerRepository.CreateOrUpdateHeader(core.Header{})
+			Expect(err).NotTo(HaveOccurred())
+			vatTollRepository = vat_toll.NewVatTollRepository(db)
+		})
+
+		It("creates a row for a new headerID", func() {
+			err = vatTollRepository.MarkHeaderChecked(headerID)
+
+			Expect(err).NotTo(HaveOccurred())
+			var headerChecked bool
+			err = db.Get(&headerChecked, `SELECT vat_toll_checked FROM public.checked_headers WHERE header_id = $1`, headerID)
+			Expect(err).NotTo(HaveOccurred())
+			Expect(headerChecked).To(BeTrue())
+		})
+
+		It("updates row when headerID already exists", func() {
+			_, err = db.Exec(`INSERT INTO public.checked_headers (header_id) VALUES ($1)`, headerID)
+
+			err = vatTollRepository.MarkHeaderChecked(headerID)
+
+			Expect(err).NotTo(HaveOccurred())
+			var headerChecked bool
+			err = db.Get(&headerChecked, `SELECT vat_toll_checked FROM public.checked_headers WHERE header_id = $1`, headerID)
+			Expect(err).NotTo(HaveOccurred())
+			Expect(headerChecked).To(BeTrue())
+		})
+	})
+
+	Describe("MissingHeaders", func() {
+		It("returns headers that haven't been checked", func() {
+			db := test_config.NewTestDB(core.Node{})
+			test_config.CleanTestDB(db)
+			headerRepository := repositories.NewHeaderRepository(db)
+			startingBlockNumber := int64(1)
+			pitFileBlockNumber := int64(2)
+			endingBlockNumber := int64(3)
+			blockNumbers := []int64{startingBlockNumber, pitFileBlockNumber, endingBlockNumber, endingBlockNumber + 1}
+			var headerIDs []int64
+			for _, n := range blockNumbers {
+				headerID, err := headerRepository.CreateOrUpdateHeader(core.Header{BlockNumber: n})
+				headerIDs = append(headerIDs, headerID)
+				Expect(err).NotTo(HaveOccurred())
+			}
+			pitFileRepository := vat_toll.NewVatTollRepository(db)
+			err := pitFileRepository.MarkHeaderChecked(headerIDs[1])
+			Expect(err).NotTo(HaveOccurred())
+
+			headers, err := pitFileRepository.MissingHeaders(startingBlockNumber, endingBlockNumber)
+
+			Expect(err).NotTo(HaveOccurred())
+			Expect(len(headers)).To(Equal(2))
+			Expect(headers[0].BlockNumber).To(Or(Equal(startingBlockNumber), Equal(endingBlockNumber)))
+			Expect(headers[1].BlockNumber).To(Or(Equal(startingBlockNumber), Equal(endingBlockNumber)))
+		})
+
+		It("only treats headers as checked if vat toll logs have been checked", func() {
+			db := test_config.NewTestDB(core.Node{})
+			test_config.CleanTestDB(db)
+			headerRepository := repositories.NewHeaderRepository(db)
+			startingBlockNumber := int64(1)
+			vatTolldBlockNumber := int64(2)
+			endingBlockNumber := int64(3)
+			blockNumbers := []int64{startingBlockNumber, vatTolldBlockNumber, endingBlockNumber, endingBlockNumber + 1}
+			var headerIDs []int64
+			for _, n := range blockNumbers {
+				headerID, err := headerRepository.CreateOrUpdateHeader(core.Header{BlockNumber: n})
+				headerIDs = append(headerIDs, headerID)
+				Expect(err).NotTo(HaveOccurred())
+			}
+			vatTollRepository := vat_toll.NewVatTollRepository(db)
+			_, err := db.Exec(`INSERT INTO public.checked_headers (header_id) VALUES ($1)`, headerIDs[1])
+			Expect(err).NotTo(HaveOccurred())
+
+			headers, err := vatTollRepository.MissingHeaders(startingBlockNumber, endingBlockNumber)
+
+			Expect(err).NotTo(HaveOccurred())
+			Expect(len(headers)).To(Equal(3))
+			Expect(headers[0].BlockNumber).To(Or(Equal(startingBlockNumber), Equal(endingBlockNumber), Equal(vatTolldBlockNumber)))
+			Expect(headers[1].BlockNumber).To(Or(Equal(startingBlockNumber), Equal(endingBlockNumber), Equal(vatTolldBlockNumber)))
+			Expect(headers[2].BlockNumber).To(Or(Equal(startingBlockNumber), Equal(endingBlockNumber), Equal(vatTolldBlockNumber)))
+		})
+
+		It("only returns headers associated with the current node", func() {
+			db := test_config.NewTestDB(core.Node{})
+			test_config.CleanTestDB(db)
+			blockNumbers := []int64{1, 2, 3}
+			headerRepository := repositories.NewHeaderRepository(db)
+			dbTwo := test_config.NewTestDB(core.Node{ID: "second"})
+			headerRepositoryTwo := repositories.NewHeaderRepository(dbTwo)
+			var headerIDs []int64
+			for _, n := range blockNumbers {
+				headerID, err := headerRepository.CreateOrUpdateHeader(core.Header{BlockNumber: n})
+				Expect(err).NotTo(HaveOccurred())
+				headerIDs = append(headerIDs, headerID)
+				_, err = headerRepositoryTwo.CreateOrUpdateHeader(core.Header{BlockNumber: n})
+				Expect(err).NotTo(HaveOccurred())
+			}
+			pitFileRepository := vat_toll.NewVatTollRepository(db)
+			pitFileRepositoryTwo := vat_toll.NewVatTollRepository(dbTwo)
+			err := pitFileRepository.MarkHeaderChecked(headerIDs[0])
+			Expect(err).NotTo(HaveOccurred())
+
+			nodeOneMissingHeaders, err := pitFileRepository.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])
+			Expect(err).NotTo(HaveOccurred())
+			Expect(len(nodeTwoMissingHeaders)).To(Equal(len(blockNumbers)))
+		})
+	})
+})
@@ -0,0 +1,62 @@
+package vat_toll
+
+import (
+	"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"
+	"log"
+)
+
+type VatTollTransformer struct {
+	Config     shared.TransformerConfig
+	Converter  Converter
+	Fetcher    shared.LogFetcher
+	Repository Repository
+}
+
+type VatTollTransformerInitializer struct {
+	Config shared.TransformerConfig
+}
+
+func (initializer VatTollTransformerInitializer) NewVatTollTransformer(db *postgres.DB, blockChain core.BlockChain) shared.Transformer {
+	converter := VatTollConverter{}
+	fetcher := shared.NewFetcher(blockChain)
+	repository := NewVatTollRepository(db)
+	return VatTollTransformer{
+		Config:     initializer.Config,
+		Converter:  converter,
+		Fetcher:    fetcher,
+		Repository: repository,
+	}
+}
+
+func (transformer VatTollTransformer) Execute() error {
+	missingHeaders, err := transformer.Repository.MissingHeaders(transformer.Config.StartingBlockNumber, transformer.Config.EndingBlockNumber)
+	if err != nil {
+		return err
+	}
+	log.Printf("Fetching vat toll event logs for %d headers \n", len(missingHeaders))
+	for _, header := range missingHeaders {
+		topics := [][]common.Hash{{common.HexToHash(shared.VatTollSignature)}}
+		matchingLogs, err := transformer.Fetcher.FetchLogs(VatTollConfig.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
+}
@@ -0,0 +1,196 @@
+package vat_toll_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/vulcanize/vulcanizedb/pkg/core"
+	"github.com/vulcanize/vulcanizedb/pkg/fakes"
+	"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_toll_mocks "github.com/vulcanize/vulcanizedb/pkg/transformers/test_data/mocks/vat_toll"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/vat_toll"
+)
+
+var _ = Describe("Vat toll transformer", func() {
+	It("gets missing headers for block numbers specified in config", func() {
+		repository := &vat_toll_mocks.MockVatTollRepository{}
+		transformer := vat_toll.VatTollTransformer{
+			Config:     vat_toll.VatTollConfig,
+			Fetcher:    &mocks.MockLogFetcher{},
+			Converter:  &vat_toll_mocks.MockVatTollConverter{},
+			Repository: repository,
+		}
+
+		err := transformer.Execute()
+
+		Expect(err).NotTo(HaveOccurred())
+		Expect(repository.PassedStartingBlockNumber).To(Equal(vat_toll.VatTollConfig.StartingBlockNumber))
+		Expect(repository.PassedEndingBlockNumber).To(Equal(vat_toll.VatTollConfig.EndingBlockNumber))
+	})
+
+	It("returns error if repository returns error for missing headers", func() {
+		repository := &vat_toll_mocks.MockVatTollRepository{}
+		repository.SetMissingHeadersErr(fakes.FakeError)
+		transformer := vat_toll.VatTollTransformer{
+			Fetcher:    &mocks.MockLogFetcher{},
+			Converter:  &vat_toll_mocks.MockVatTollConverter{},
+			Repository: repository,
+		}
+
+		err := transformer.Execute()
+
+		Expect(err).To(HaveOccurred())
+		Expect(err).To(MatchError(fakes.FakeError))
+	})
+
+	It("fetches logs for missing headers", func() {
+		fetcher := &mocks.MockLogFetcher{}
+		repository := &vat_toll_mocks.MockVatTollRepository{}
+		repository.SetMissingHeaders([]core.Header{{BlockNumber: 1}, {BlockNumber: 2}})
+		transformer := vat_toll.VatTollTransformer{
+			Fetcher:    fetcher,
+			Converter:  &vat_toll_mocks.MockVatTollConverter{},
+			Repository: repository,
+		}
+
+		err := transformer.Execute()
+
+		Expect(err).NotTo(HaveOccurred())
+		Expect(fetcher.FetchedBlocks).To(Equal([]int64{1, 2}))
+		Expect(fetcher.FetchedContractAddresses).To(Equal([][]string{vat_toll.VatTollConfig.ContractAddresses, vat_toll.VatTollConfig.ContractAddresses}))
+		Expect(fetcher.FetchedTopics).To(Equal([][]common.Hash{{common.HexToHash(shared.VatTollSignature)}}))
+	})
+
+	It("returns error if fetcher returns error", func() {
+		fetcher := &mocks.MockLogFetcher{}
+		fetcher.SetFetcherError(fakes.FakeError)
+		repository := &vat_toll_mocks.MockVatTollRepository{}
+		repository.SetMissingHeaders([]core.Header{{BlockNumber: 1}})
+		transformer := vat_toll.VatTollTransformer{
+			Fetcher:    fetcher,
+			Converter:  &vat_toll_mocks.MockVatTollConverter{},
+			Repository: repository,
+		}
+
+		err := transformer.Execute()
+
+		Expect(err).To(HaveOccurred())
+		Expect(err).To(MatchError(fakes.FakeError))
+	})
+
+	It("marks header checked if no logs returned", func() {
+		mockConverter := &vat_toll_mocks.MockVatTollConverter{}
+		mockRepository := &vat_toll_mocks.MockVatTollRepository{}
+		headerID := int64(123)
+		mockRepository.SetMissingHeaders([]core.Header{{Id: headerID}})
+		mockFetcher := &mocks.MockLogFetcher{}
+		transformer := vat_toll.VatTollTransformer{
+			Converter:  mockConverter,
+			Fetcher:    mockFetcher,
+			Repository: mockRepository,
+		}
+
+		err := transformer.Execute()
+
+		Expect(err).NotTo(HaveOccurred())
+		mockRepository.AssertMarkHeaderCheckedCalledWith(headerID)
+	})
+
+	It("returns error if marking header checked returns err", func() {
+		mockConverter := &vat_toll_mocks.MockVatTollConverter{}
+		mockRepository := &vat_toll_mocks.MockVatTollRepository{}
+		mockRepository.SetMissingHeaders([]core.Header{{Id: int64(123)}})
+		mockRepository.SetMarkHeaderCheckedErr(fakes.FakeError)
+		mockFetcher := &mocks.MockLogFetcher{}
+		transformer := vat_toll.VatTollTransformer{
+			Converter:  mockConverter,
+			Fetcher:    mockFetcher,
+			Repository: mockRepository,
+		}
+
+		err := transformer.Execute()
+
+		Expect(err).To(HaveOccurred())
+		Expect(err).To(MatchError(fakes.FakeError))
+	})
+
+	It("converts matching logs", func() {
+		converter := &vat_toll_mocks.MockVatTollConverter{}
+		fetcher := &mocks.MockLogFetcher{}
+		fetcher.SetFetchedLogs([]types.Log{test_data.EthVatTollLog})
+		repository := &vat_toll_mocks.MockVatTollRepository{}
+		repository.SetMissingHeaders([]core.Header{{BlockNumber: 1}})
+		transformer := vat_toll.VatTollTransformer{
+			Fetcher:    fetcher,
+			Converter:  converter,
+			Repository: repository,
+		}
+
+		err := transformer.Execute()
+
+		Expect(err).NotTo(HaveOccurred())
+		Expect(converter.PassedLogs).To(Equal([]types.Log{test_data.EthVatTollLog}))
+	})
+
+	It("returns error if converter returns error", func() {
+		converter := &vat_toll_mocks.MockVatTollConverter{}
+		converter.SetConverterError(fakes.FakeError)
+		fetcher := &mocks.MockLogFetcher{}
+		fetcher.SetFetchedLogs([]types.Log{test_data.EthVatTollLog})
+		repository := &vat_toll_mocks.MockVatTollRepository{}
+		repository.SetMissingHeaders([]core.Header{{BlockNumber: 1}})
+		transformer := vat_toll.VatTollTransformer{
+			Fetcher:    fetcher,
+			Converter:  converter,
+			Repository: repository,
+		}
+
+		err := transformer.Execute()
+
+		Expect(err).To(HaveOccurred())
+		Expect(err).To(MatchError(fakes.FakeError))
+	})
+
+	It("persists vat toll model", func() {
+		converter := &vat_toll_mocks.MockVatTollConverter{}
+		fetcher := &mocks.MockLogFetcher{}
+		fetcher.SetFetchedLogs([]types.Log{test_data.EthVatTollLog})
+		repository := &vat_toll_mocks.MockVatTollRepository{}
+		fakeHeader := core.Header{BlockNumber: 1, Id: 2}
+		repository.SetMissingHeaders([]core.Header{fakeHeader})
+		transformer := vat_toll.VatTollTransformer{
+			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([]vat_toll.VatTollModel{test_data.VatTollModel}))
+	})
+
+	It("returns error if repository returns error for create", func() {
+		converter := &vat_toll_mocks.MockVatTollConverter{}
+		fetcher := &mocks.MockLogFetcher{}
+		fetcher.SetFetchedLogs([]types.Log{test_data.EthVatTollLog})
+		repository := &vat_toll_mocks.MockVatTollRepository{}
+		repository.SetMissingHeaders([]core.Header{{BlockNumber: 1, Id: 2}})
+		repository.SetCreateError(fakes.FakeError)
+		transformer := vat_toll.VatTollTransformer{
+			Fetcher:    fetcher,
+			Converter:  converter,
+			Repository: repository,
+		}
+
+		err := transformer.Execute()
+
+		Expect(err).To(HaveOccurred())
+		Expect(err).To(MatchError(fakes.FakeError))
+	})
+})
@@ -0,0 +1,19 @@
+package vat_toll_test
+
+import (
+	"testing"
+
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+	"io/ioutil"
+	"log"
+)
+
+func TestVatToll(t *testing.T) {
+	RegisterFailHandler(Fail)
+	RunSpecs(t, "VatToll Suite")
+}
+
+var _ = BeforeSuite(func() {
+	log.SetOutput(ioutil.Discard)
+})