vat flux transformer

cmd/continuousLogSync.go

@@ -111,6 +111,7 @@ func buildTransformerInitializerMap() map[string]shared2.TransformerInitializer
 	transformerInitializerMap["vatFold"] = transformers.VatFoldTransformerInitializer
 	transformerInitializerMap["vatToll"] = transformers.VatTollTransformerInitializer
 	transformerInitializerMap["vatTune"] = transformers.VatTuneTransformerInitializer
+	transformerInitializerMap["vatFlux"] = transformers.VatFluxTransformerInitializer
 
 	return transformerInitializerMap
 }

pkg/transformers/shared/constants.go

@@ -34,7 +34,8 @@ var (
 	PipContractAddress     = "0x9FfFE440258B79c5d6604001674A4722FfC0f7Bc"
 	PitContractAddress     = "0xe7cf3198787c9a4daac73371a38f29aaeeced87e"
 	RepContractAddress     = "0xf88bbdc1e2718f8857f30a180076ec38d53cf296"
-	VatContractAddress     = "0xcd726790550afcd77e9a7a47e86a3f9010af126b"
+	//VatContractAddress     = "0xcd726790550afcd77e9a7a47e86a3f9010af126b"
+	VatContractAddress	   = "0x239e6f0ab02713f1f8aa90ebeded9fc66dc96cd6"
 
 	//TODO: get pit and drip file method signatures directly from the ABI
 	biteMethod                = GetSolidityMethodSignature(CatABI, "Bite")
@@ -62,6 +63,7 @@ var (
 	vatFoldMethod             = GetSolidityMethodSignature(VatABI, "fold")
 	vatTollMethod             = GetSolidityMethodSignature(VatABI, "toll")
 	vatTuneMethod             = GetSolidityMethodSignature(VatABI, "tune")
+	vatFluxMethod             = GetSolidityMethodSignature(VatABI, "flux")
 
 	BiteSignature                = GetEventSignature(biteMethod)
 	DealSignature                = GetLogNoteSignature(dealMethod)
@@ -88,4 +90,5 @@ var (
 	VatFoldSignature             = GetLogNoteSignature(vatFoldMethod)
 	VatTollSignature             = GetLogNoteSignature(vatTollMethod)
 	VatTuneSignature             = GetLogNoteSignature(vatTuneMethod)
+	VatFluxSignature             = GetLogNoteSignature(vatFluxMethod)
 )

pkg/transformers/shared/event_signature_generator_test.go

@@ -133,6 +133,13 @@ var _ = Describe("Event signature generator", func() {
 				Expect(expected).To(Equal(actual))
 			})
 
+			It("gets the vat flux method signature", func() {
+				expected := "flux(bytes32,bytes32,bytes32,int256)"
+				actual := shared.GetSolidityMethodSignature(shared.VatABI, "flux")
+
+				Expect(expected).To(Equal(actual))
+			})
+
 			It("gets the flip deal method signature", func() {
 				expected := "deal(uint256)"
 				actual := shared.GetSolidityMethodSignature(shared.FlipperABI, "deal")

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

@@ -0,0 +1,22 @@
+package vat_flux
+
+import (
+	"github.com/ethereum/go-ethereum/core/types"
+
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/test_data"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/vat_flux"
+)
+
+type MockVatFlux struct {
+	err        error
+	PassedLogs []types.Log
+}
+
+func (converter *MockVatFlux) ToModels(ethLogs []types.Log) ([]vat_flux.VatFluxModel, error) {
+	converter.PassedLogs = ethLogs
+	return []vat_flux.VatFluxModel{test_data.VatFluxModel}, converter.err
+}
+
+func (converter *MockVatFlux) SetConverterError(e error) {
+	converter.err = e
+}

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

@@ -0,0 +1,65 @@
+// 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_flux
+
+import (
+	"github.com/vulcanize/vulcanizedb/pkg/core"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/vat_flux"
+)
+
+type MockVatFluxRepository struct {
+	createErr                       error
+	markHeaderCheckedErr            error
+	MarkHeaderCheckedPassedHeaderID int64
+	missingHeaders                  []core.Header
+	missingHeadersErr               error
+	PassedStartingBlockNumber       int64
+	PassedEndingBlockNumber         int64
+	PassedHeaderID                  int64
+	PassedModels                    []vat_flux.VatFluxModel
+}
+
+func (repository *MockVatFluxRepository) MarkCheckedHeader(headerId int64) error {
+	repository.MarkHeaderCheckedPassedHeaderID = headerId
+	return repository.markHeaderCheckedErr
+}
+
+func (repository *MockVatFluxRepository) Create(headerID int64, models []vat_flux.VatFluxModel) error {
+	repository.PassedHeaderID = headerID
+	repository.PassedModels = models
+	return repository.createErr
+}
+
+func (repository *MockVatFluxRepository) MissingHeaders(startingBlockNumber, endingBlockNumber int64) ([]core.Header, error) {
+	repository.PassedStartingBlockNumber = startingBlockNumber
+	repository.PassedEndingBlockNumber = endingBlockNumber
+	return repository.missingHeaders, repository.missingHeadersErr
+}
+
+func (repository *MockVatFluxRepository) SetMarkHeaderCheckedErr(e error) {
+	repository.markHeaderCheckedErr = e
+}
+
+func (repository *MockVatFluxRepository) SetMissingHeadersErr(e error) {
+	repository.missingHeadersErr = e
+}
+
+func (repository *MockVatFluxRepository) SetMissingHeaders(headers []core.Header) {
+	repository.missingHeaders = headers
+}
+
+func (repository *MockVatFluxRepository) SetCreateError(e error) {
+	repository.createErr = e
+}

pkg/transformers/test_data/vat_flux.go

@@ -0,0 +1,52 @@
+/*
+ *  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
+
+import (
+	"encoding/json"
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/common/hexutil"
+	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/vat_flux"
+)
+
+var VatFluxLog = types.Log{
+	Address: common.HexToAddress("0x239e6f0ab02713f1f8aa90ebeded9fc66dc96cd6"),
+	Topics: []common.Hash{
+		common.HexToHash("0xa6e4182100000000000000000000000000000000000000000000000000000000"),
+		common.HexToHash("0x0000000000000000000000007340e006f4135ba6970d43bf43d88dcad4e7a8ca"),
+		common.HexToHash("0x0000000000000000000000007fa9ef6609ca7921112231f8f195138ebba29770"),
+		common.HexToHash("0x00000000000000000000000093086347c52a8878af71bb818509d484c6a2e1bf"),
+	},
+	Data:        hexutil.MustDecode("0x00000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000084a6e418217340e006f4135ba6970d43bf43d88dcad4e7a8ca00000000000000000000000007fa9ef6609ca7921112231f8f195138ebba297700000000000000000000000093086347c52a8878af71bb818509d484c6a2e1bf000000000000000000000000000000000000000000000000000000000000000000000000000000000000007b"),
+	BlockNumber: 23,
+	TxHash:      common.HexToHash("0xf98681bab9b8c75bd8aa4a7d0a8142ff527c5ea8fa54f3c2835d4533838b2e6f"),
+	TxIndex:     0,
+	BlockHash:   common.HexToHash("0xc3fe212ad4f81ade1265af6de2b4bb50d962b1a4db06aabc982e7f9cb0972c2d"),
+	Index:       0,
+	Removed:     false,
+}
+
+var rawFluxLog, _ = json.Marshal(VatFluxLog)
+var VatFluxModel = vat_flux.VatFluxModel{
+	Ilk:              "0x7340e006f4135BA6970D43bf43d88DCAD4e7a8CA",
+	Src:              "0x07Fa9eF6609cA7921112231F8f195138ebbA2977",
+	Dst:              "0x93086347c52a8878af71bB818509d484c6a2e1bF",
+	Rad:              "123",
+	TransactionIndex: 0,
+	Raw:              rawFluxLog,
+}

pkg/transformers/transformers.go

@@ -37,6 +37,7 @@ import (
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/price_feeds"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/tend"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/vat_flux"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/vat_fold"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/vat_grab"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/vat_heal"
@@ -75,6 +76,7 @@ var (
 	VatFoldTransformerInitializer             = vat_fold.VatFoldTransformerInitializer{Config: vat_fold.VatFoldConfig}.NewVatFoldTransformer
 	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 {
@@ -104,5 +106,6 @@ func TransformerInitializers() []shared.TransformerInitializer {
 		VatFoldTransformerInitializer,
 		VatTollTransformerInitializer,
 		VatTuneTransformerInitializer,
+		VatFluxTransformerInitializer,
 	}
 }

pkg/transformers/vat_flux/config.go

@@ -0,0 +1,11 @@
+package vat_flux
+
+import "github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
+
+var VatFluxConfig = shared.TransformerConfig{
+	ContractAddresses:   []string{shared.VatContractAddress},
+	ContractAbi:         shared.VatABI,
+	Topics:              []string{shared.VatFluxSignature},
+	StartingBlockNumber: 0,
+	EndingBlockNumber:   10000000,
+}

pkg/transformers/vat_flux/converter.go

@@ -0,0 +1,75 @@
+// 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_flux
+
+import (
+	"encoding/json"
+	"errors"
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
+	"math/big"
+)
+
+type Converter interface {
+	ToModels(ethLogs []types.Log) ([]VatFluxModel, error)
+}
+
+type VatFluxConverter struct{}
+
+func (VatFluxConverter) ToModels(ethLogs []types.Log) ([]VatFluxModel, error) {
+	var models []VatFluxModel
+	for _, ethLog := range ethLogs {
+		err := verifyLog(ethLog)
+		if err != nil {
+			return nil, err
+		}
+
+		ilk := common.BytesToAddress(ethLog.Topics[1].Bytes()[:])
+		src := common.BytesToAddress(ethLog.Topics[2].Bytes()[:])
+		dst := common.BytesToAddress(ethLog.Topics[3].Bytes()[:])
+		radBytes := shared.GetDataBytesAtIndex(-1, ethLog.Data)
+		rad := big.NewInt(0).SetBytes(radBytes).String()
+
+		if err != nil {
+			return nil, err
+		}
+
+		rawLogJson, err := json.Marshal(ethLog)
+		if err != nil {
+			return nil, err
+		}
+
+		model := VatFluxModel{
+			Ilk:              ilk.String(),
+			Src:              src.String(),
+			Dst:              dst.String(),
+			Rad:              rad,
+			TransactionIndex: ethLog.TxIndex,
+			Raw:              rawLogJson,
+		}
+
+		models = append(models, model)
+	}
+
+	return models, nil
+}
+
+func verifyLog(log types.Log) error {
+	if len(log.Topics) < 4 {
+		return errors.New("log missing topics")
+	}
+	return nil
+}

pkg/transformers/vat_flux/converter_test.go

@@ -0,0 +1,54 @@
+// 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_flux_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/transformers/test_data"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/vat_flux"
+)
+
+var _ = Describe("VatFlux converter", func() {
+	It("Converts logs to models", func() {
+		converter := vat_flux.VatFluxConverter{}
+		models, err := converter.ToModels([]types.Log{test_data.VatFluxLog})
+
+		Expect(err).NotTo(HaveOccurred())
+		Expect(models[0].Ilk).To(Equal(test_data.VatFluxModel.Ilk))
+		Expect(models[0].Src).To(Equal(test_data.VatFluxModel.Src))
+		Expect(models[0].Dst).To(Equal(test_data.VatFluxModel.Dst))
+		Expect(models[0].Rad).To(Equal(test_data.VatFluxModel.Rad))
+		Expect(models[0].TransactionIndex).To(Equal(test_data.VatFluxModel.TransactionIndex))
+		Expect(models[0].Raw).To(Equal(test_data.VatFluxModel.Raw))
+	})
+
+	It("Returns an error there are missing topics", func() {
+		converter := vat_flux.VatFluxConverter{}
+		badLog := types.Log{
+			Topics: []common.Hash{
+				common.HexToHash("0x"),
+				common.HexToHash("0x"),
+				common.HexToHash("0x"),
+			},
+		}
+		_, err := converter.ToModels([]types.Log{badLog})
+
+		Expect(err).To(HaveOccurred())
+	})
+})

pkg/transformers/vat_flux/model.go

@@ -0,0 +1,24 @@
+// 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_flux
+
+type VatFluxModel struct {
+	Ilk              string
+	Src              string
+	Dst              string
+	Rad              string
+	TransactionIndex uint   `db:"tx_idx"`
+	Raw              []byte `db:"raw_log"`
+}

pkg/transformers/vat_flux/repository.go

@@ -0,0 +1,84 @@
+// 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_flux
+
+import (
+	"github.com/vulcanize/vulcanizedb/pkg/core"
+	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
+)
+
+type Repository interface {
+	Create(headerId int64, models []VatFluxModel) error
+	MissingHeaders(startingBlock, endingBlock int64) ([]core.Header, error)
+	MarkCheckedHeader(headerId int64) error
+}
+
+type VatFluxRepository struct {
+	DB *postgres.DB
+}
+
+func NewVatFluxRepository(db *postgres.DB) VatFluxRepository {
+	return VatFluxRepository{DB: db}
+}
+
+func (repository VatFluxRepository) Create(headerId int64, models []VatFluxModel) error {
+	tx, err := repository.DB.Begin()
+	if err != nil {
+		return err
+	}
+
+	for _, model := range models {
+		_, err := tx.Exec(`INSERT INTO maker.vat_flux (header_id, ilk, dst, src, rad, tx_idx, raw_log)
+		VALUES($1, $2, $3, $4, $5, $6, $7)`,
+			headerId, model.Ilk, model.Dst, model.Src, model.Rad, model.TransactionIndex, model.Raw)
+		if err != nil {
+			tx.Rollback()
+			return err
+		}
+	}
+
+	_, err = tx.Exec(`INSERT INTO public.checked_headers (header_id, vat_flux_checked)
+			VALUES($1, $2)
+		ON CONFLICT (header_id) DO
+			UPDATE SET vat_flux_checked = $2`, headerId, true)
+	if err != nil {
+		tx.Rollback()
+		return err
+	}
+	return tx.Commit()
+}
+
+func (repository VatFluxRepository) MissingHeaders(startingBlock, endingBlock int64) ([]core.Header, error) {
+	var headers []core.Header
+	err := repository.DB.Select(&headers,
+		`SELECT headers.id, block_number from headers
+               LEFT JOIN checked_headers on headers.id = header_id
+               WHERE (header_id ISNULL OR vat_flux_checked IS FALSE)
+               AND headers.block_number >= $1
+               AND headers.block_number <= $2
+               AND headers.eth_node_fingerprint = $3`,
+		startingBlock, endingBlock, repository.DB.Node.ID)
+
+	return headers, err
+}
+
+func (repository VatFluxRepository) MarkCheckedHeader(headerId int64) error {
+	_, err := repository.DB.Exec(`INSERT INTO public.checked_headers (header_id, vat_flux_checked)
+			VALUES($1, $2)
+		ON CONFLICT (header_id) DO
+			UPDATE SET vat_flux_checked = $2`, headerId, true)
+
+	return err
+}

pkg/transformers/vat_flux/repository_test.go

@@ -0,0 +1,226 @@
+// 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_flux_test
+
+import (
+	. "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_flux"
+	"github.com/vulcanize/vulcanizedb/test_config"
+)
+
+var _ = Describe("VatFlux Repository", func() {
+	var db *postgres.DB
+	var repository vat_flux.VatFluxRepository
+	var headerRepository repositories.HeaderRepository
+	var headerId int64
+	var err error
+
+	BeforeEach(func() {
+		node := test_config.NewTestNode()
+		db = test_config.NewTestDB(node)
+		test_config.CleanTestDB(db)
+		repository = vat_flux.VatFluxRepository{DB: db}
+		headerRepository = repositories.NewHeaderRepository(db)
+		headerId, err = headerRepository.CreateOrUpdateHeader(core.Header{})
+		Expect(err).NotTo(HaveOccurred())
+	})
+
+	type VatFluxDBResult struct {
+		vat_flux.VatFluxModel
+		Id       int
+		HeaderId int64 `db:"header_id"`
+	}
+
+	type CheckedHeaderResult struct {
+		VatFluxChecked bool `db:"vat_flux_checked"`
+	}
+
+	Describe("Create", func() {
+		It("persists vat flux records", func() {
+			anotherVatFlux := test_data.VatFluxModel
+			anotherVatFlux.TransactionIndex = test_data.VatFluxModel.TransactionIndex + 1
+			err = repository.Create(headerId, []vat_flux.VatFluxModel{test_data.VatFluxModel, anotherVatFlux})
+
+			var dbResult []VatFluxDBResult
+			err = db.Select(&dbResult, `SELECT * from maker.vat_flux where header_id = $1`, headerId)
+			Expect(err).NotTo(HaveOccurred())
+			Expect(len(dbResult)).To(Equal(2))
+			Expect(dbResult[0].Ilk).To(Equal(test_data.VatFluxModel.Ilk))
+			Expect(dbResult[0].Dst).To(Equal(test_data.VatFluxModel.Dst))
+			Expect(dbResult[0].Src).To(Equal(test_data.VatFluxModel.Src))
+			Expect(dbResult[0].Rad).To(Equal(test_data.VatFluxModel.Rad))
+			Expect(dbResult[0].TransactionIndex).To(Equal(test_data.VatFluxModel.TransactionIndex))
+			Expect(dbResult[1].TransactionIndex).To(Equal(test_data.VatFluxModel.TransactionIndex + 1))
+			Expect(dbResult[0].Raw).To(MatchJSON(test_data.VatFluxModel.Raw))
+			Expect(dbResult[0].HeaderId).To(Equal(headerId))
+		})
+
+		It("returns an error if the insertion fails", func() {
+			err = repository.Create(headerId, []vat_flux.VatFluxModel{test_data.VatFluxModel})
+			Expect(err).NotTo(HaveOccurred())
+			err = repository.Create(headerId, []vat_flux.VatFluxModel{test_data.VatFluxModel})
+			Expect(err).To(HaveOccurred())
+			Expect(err.Error()).To(ContainSubstring("pq: duplicate key value violates unique constraint"))
+		})
+
+		It("marks the header as checked for vat flux logs", func() {
+			err = repository.Create(headerId, []vat_flux.VatFluxModel{test_data.VatFluxModel})
+			Expect(err).NotTo(HaveOccurred())
+
+			var headerChecked bool
+			err = db.Get(&headerChecked, `SELECT vat_flux_checked FROM public.checked_headers WHERE header_id = $1`, headerId)
+			Expect(err).NotTo(HaveOccurred())
+			Expect(headerChecked).To(BeTrue())
+		})
+
+		It("removes vat flux if corresponding header is deleted", func() {
+			err = repository.Create(headerId, []vat_flux.VatFluxModel{test_data.VatFluxModel})
+			Expect(err).NotTo(HaveOccurred())
+
+			_, err = db.Exec(`DELETE FROM headers WHERE id = $1`, headerId)
+
+			Expect(err).NotTo(HaveOccurred())
+			var count int
+			err = db.QueryRow(`SELECT count(*) from maker.vat_flux`).Scan(&count)
+			Expect(err).NotTo(HaveOccurred())
+			Expect(count).To(Equal(0))
+		})
+
+		It("wraps create in a transaction", func() {
+			err = repository.Create(headerId, []vat_flux.VatFluxModel{test_data.VatFluxModel, test_data.VatFluxModel})
+			Expect(err).To(HaveOccurred())
+			var count int
+			err = repository.DB.QueryRowx(`SELECT count(*) FROM maker.vat_flux`).Scan(&count)
+			Expect(count).To(Equal(0))
+		})
+	})
+
+	Describe("MissingHeaders", func() {
+		It("returns headers that haven't been checked", func() {
+			startingBlock := GinkgoRandomSeed()
+			vatFluxBlock := startingBlock + 1
+			endingBlock := startingBlock + 2
+			outsideRangeBlock := startingBlock + 3
+
+			var headerIds []int64
+			blockNumbers := []int64{startingBlock, vatFluxBlock, endingBlock, outsideRangeBlock}
+			for _, n := range blockNumbers {
+				headerId, err := headerRepository.CreateOrUpdateHeader(core.Header{BlockNumber: n})
+				Expect(err).NotTo(HaveOccurred())
+				headerIds = append(headerIds, headerId)
+			}
+
+			err = repository.MarkCheckedHeader(headerIds[0])
+			Expect(err).NotTo(HaveOccurred())
+
+			headers, err := repository.MissingHeaders(startingBlock, endingBlock)
+			Expect(err).NotTo(HaveOccurred())
+			Expect(headers[0].Id).To(Or(Equal(headerIds[1]), Equal(headerIds[2])))
+			Expect(headers[1].Id).To(Or(Equal(headerIds[1]), Equal(headerIds[2])))
+			Expect(len(headers)).To(Equal(2))
+		})
+
+		It("returns header ids when checked_headers.vat_flux is false", func() {
+			startingBlock := GinkgoRandomSeed()
+			vatFluxBlock := startingBlock + 1
+			endingBlock := startingBlock + 2
+			outsideRangeBlock := startingBlock + 3
+
+			var headerIds []int64
+			blockNumbers := []int64{startingBlock, vatFluxBlock, endingBlock, outsideRangeBlock}
+			for _, n := range blockNumbers {
+				headerId, err := headerRepository.CreateOrUpdateHeader(core.Header{BlockNumber: n})
+				Expect(err).NotTo(HaveOccurred())
+				headerIds = append(headerIds, headerId)
+			}
+
+			err = repository.MarkCheckedHeader(headerIds[0])
+			_, err = repository.DB.Exec(`INSERT INTO checked_headers (header_id) VALUES ($1)`, headerIds[1])
+			Expect(err).NotTo(HaveOccurred())
+
+			headers, err := repository.MissingHeaders(startingBlock, endingBlock)
+			Expect(err).NotTo(HaveOccurred())
+			Expect(headers[0].Id).To(Or(Equal(headerIds[1]), Equal(headerIds[2])))
+			Expect(headers[1].Id).To(Or(Equal(headerIds[1]), Equal(headerIds[2])))
+			Expect(len(headers)).To(Equal(2))
+		})
+
+		It("only returns header ids for the current node", func() {
+			startingBlock := GinkgoRandomSeed()
+			vatFluxBlock := startingBlock + 1
+			endingBlock := startingBlock + 2
+			outsideRangeBlock := startingBlock + 3
+			db2 := test_config.NewTestDB(core.Node{ID: "second node"})
+			headerRepository2 := repositories.NewHeaderRepository(db2)
+			repository2 := vat_flux.NewVatFluxRepository(db2)
+
+			var headerIds []int64
+			blockNumbers := []int64{startingBlock, vatFluxBlock, endingBlock, outsideRangeBlock}
+			for _, n := range blockNumbers {
+				headerId, err := headerRepository.CreateOrUpdateHeader(core.Header{BlockNumber: n})
+				Expect(err).NotTo(HaveOccurred())
+				headerIds = append(headerIds, headerId)
+
+				_, err = headerRepository2.CreateOrUpdateHeader(core.Header{BlockNumber: n})
+				Expect(err).NotTo(HaveOccurred())
+			}
+
+			err = repository.MarkCheckedHeader(headerIds[0])
+			Expect(err).NotTo(HaveOccurred())
+
+			nodeOneMissingHeaders, err := repository.MissingHeaders(startingBlock, endingBlock)
+			Expect(err).NotTo(HaveOccurred())
+			Expect(len(nodeOneMissingHeaders)).To(Equal(2))
+
+			nodeTwoMissingHeaders, err := repository2.MissingHeaders(startingBlock, endingBlock)
+			Expect(err).NotTo(HaveOccurred())
+			Expect(len(nodeTwoMissingHeaders)).To(Equal(3))
+		})
+	})
+
+	Describe("MarkCheckedHeader", func() {
+		It("creates a new checked_header record", func() {
+			err := repository.MarkCheckedHeader(headerId)
+			Expect(err).NotTo(HaveOccurred())
+
+			var checkedHeaderResult = CheckedHeaderResult{}
+			err = db.Get(&checkedHeaderResult, `SELECT vat_flux_checked FROM checked_headers WHERE header_id = $1`, headerId)
+			Expect(err).NotTo(HaveOccurred())
+			Expect(checkedHeaderResult.VatFluxChecked).To(BeTrue())
+		})
+
+		It("updates an existing checked header", func() {
+			_, err := repository.DB.Exec(`INSERT INTO checked_headers (header_id) VALUES($1)`, headerId)
+			Expect(err).NotTo(HaveOccurred())
+
+			var checkedHeaderResult CheckedHeaderResult
+			err = db.Get(&checkedHeaderResult, `SELECT vat_flux_checked FROM checked_headers WHERE header_id = $1`, headerId)
+			Expect(err).NotTo(HaveOccurred())
+			Expect(checkedHeaderResult.VatFluxChecked).To(BeFalse())
+
+			err = repository.MarkCheckedHeader(headerId)
+			Expect(err).NotTo(HaveOccurred())
+
+			err = db.Get(&checkedHeaderResult, `SELECT vat_flux_checked FROM checked_headers WHERE header_id = $1`, headerId)
+			Expect(err).NotTo(HaveOccurred())
+			Expect(checkedHeaderResult.VatFluxChecked).To(BeTrue())
+		})
+	})
+})

pkg/transformers/vat_flux/transformer.go

@@ -0,0 +1,63 @@
+package vat_flux
+
+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 VatFluxTransformerInitializer struct {
+	Config shared.TransformerConfig
+}
+
+func (initializer VatFluxTransformerInitializer) NewVatFluxTransformer(db *postgres.DB, blockChain core.BlockChain) shared.Transformer {
+	converter := VatFluxConverter{}
+	fetcher := shared.NewFetcher(blockChain)
+	repository := NewVatFluxRepository(db)
+	return VatFluxTransformer{
+		Config:     initializer.Config,
+		Converter:  converter,
+		Fetcher:    fetcher,
+		Repository: repository,
+	}
+}
+
+type VatFluxTransformer struct {
+	Config     shared.TransformerConfig
+	Converter  Converter
+	Fetcher    shared.LogFetcher
+	Repository Repository
+}
+
+func (transformer VatFluxTransformer) Execute() error {
+	missingHeaders, err := transformer.Repository.MissingHeaders(transformer.Config.StartingBlockNumber, transformer.Config.EndingBlockNumber)
+	if err != nil {
+		return err
+	}
+	log.Printf("Fetching vat flux event logs for %d headers \n", len(missingHeaders))
+	for _, header := range missingHeaders {
+		topics := [][]common.Hash{{common.HexToHash(shared.VatFluxSignature)}}
+		matchingLogs, err := transformer.Fetcher.FetchLogs(VatFluxConfig.ContractAddresses, topics, header.BlockNumber)
+		if err != nil {
+			return err
+		}
+		if len(matchingLogs) < 1 {
+			err = transformer.Repository.MarkCheckedHeader(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_flux/transformer_test.go

@@ -0,0 +1,178 @@
+package vat_flux_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_flux_mocks "github.com/vulcanize/vulcanizedb/pkg/transformers/test_data/mocks/vat_flux"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/vat_flux"
+)
+
+var _ = Describe("Vat flux transformer", func() {
+	It("gets missing headers for block numbers specified in config", func() {
+		repository := &vat_flux_mocks.MockVatFluxRepository{}
+		transformer := vat_flux.VatFluxTransformer{
+			Config:     vat_flux.VatFluxConfig,
+			Fetcher:    &mocks.MockLogFetcher{},
+			Converter:  &vat_flux_mocks.MockVatFlux{},
+			Repository: repository,
+		}
+
+		err := transformer.Execute()
+
+		Expect(err).NotTo(HaveOccurred())
+		Expect(repository.PassedStartingBlockNumber).To(Equal(vat_flux.VatFluxConfig.StartingBlockNumber))
+		Expect(repository.PassedEndingBlockNumber).To(Equal(vat_flux.VatFluxConfig.EndingBlockNumber))
+	})
+
+	It("returns error if repository returns error for missing headers", func() {
+		repository := &vat_flux_mocks.MockVatFluxRepository{}
+		repository.SetMissingHeadersErr(fakes.FakeError)
+		transformer := vat_flux.VatFluxTransformer{
+			Fetcher:    &mocks.MockLogFetcher{},
+			Converter:  &vat_flux_mocks.MockVatFlux{},
+			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_flux_mocks.MockVatFluxRepository{}
+		repository.SetMissingHeaders([]core.Header{{BlockNumber: 1}, {BlockNumber: 2}})
+		transformer := vat_flux.VatFluxTransformer{
+			Fetcher:    fetcher,
+			Converter:  &vat_flux_mocks.MockVatFlux{},
+			Repository: repository,
+		}
+
+		err := transformer.Execute()
+
+		Expect(err).NotTo(HaveOccurred())
+		Expect(fetcher.FetchedBlocks).To(Equal([]int64{1, 2}))
+		Expect(fetcher.FetchedContractAddresses).To(Equal([][]string{vat_flux.VatFluxConfig.ContractAddresses, vat_flux.VatFluxConfig.ContractAddresses}))
+		Expect(fetcher.FetchedTopics).To(Equal([][]common.Hash{{common.HexToHash(shared.VatFluxSignature)}}))
+	})
+
+	It("returns error if fetcher returns error", func() {
+		fetcher := &mocks.MockLogFetcher{}
+		fetcher.SetFetcherError(fakes.FakeError)
+		repository := &vat_flux_mocks.MockVatFluxRepository{}
+		repository.SetMissingHeaders([]core.Header{{BlockNumber: 1}})
+		transformer := vat_flux.VatFluxTransformer{
+			Fetcher:    fetcher,
+			Converter:  &vat_flux_mocks.MockVatFlux{},
+			Repository: repository,
+		}
+
+		err := transformer.Execute()
+
+		Expect(err).To(HaveOccurred())
+		Expect(err).To(MatchError(fakes.FakeError))
+	})
+
+	It("returns error if marking header checked returns err", func() {
+		mockConverter := &vat_flux_mocks.MockVatFlux{}
+		mockRepository := &vat_flux_mocks.MockVatFluxRepository{}
+		mockRepository.SetMissingHeaders([]core.Header{{Id: int64(123)}})
+		mockRepository.SetMarkHeaderCheckedErr(fakes.FakeError)
+		mockFetcher := &mocks.MockLogFetcher{}
+		transformer := vat_flux.VatFluxTransformer{
+			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_flux_mocks.MockVatFlux{}
+		fetcher := &mocks.MockLogFetcher{}
+		fetcher.SetFetchedLogs([]types.Log{test_data.VatFluxLog})
+		repository := &vat_flux_mocks.MockVatFluxRepository{}
+		repository.SetMissingHeaders([]core.Header{{BlockNumber: 1}})
+		transformer := vat_flux.VatFluxTransformer{
+			Fetcher:    fetcher,
+			Converter:  converter,
+			Repository: repository,
+		}
+
+		err := transformer.Execute()
+
+		Expect(err).NotTo(HaveOccurred())
+		Expect(converter.PassedLogs).To(Equal([]types.Log{test_data.VatFluxLog}))
+	})
+
+	It("returns error if converter returns error", func() {
+		converter := &vat_flux_mocks.MockVatFlux{}
+		converter.SetConverterError(fakes.FakeError)
+		fetcher := &mocks.MockLogFetcher{}
+		fetcher.SetFetchedLogs([]types.Log{test_data.VatFluxLog})
+		repository := &vat_flux_mocks.MockVatFluxRepository{}
+		repository.SetMissingHeaders([]core.Header{{BlockNumber: 1}})
+		transformer := vat_flux.VatFluxTransformer{
+			Fetcher:    fetcher,
+			Converter:  converter,
+			Repository: repository,
+		}
+
+		err := transformer.Execute()
+
+		Expect(err).To(HaveOccurred())
+		Expect(err).To(MatchError(fakes.FakeError))
+	})
+
+	It("persists vat flux model", func() {
+		converter := &vat_flux_mocks.MockVatFlux{}
+		fetcher := &mocks.MockLogFetcher{}
+		fetcher.SetFetchedLogs([]types.Log{test_data.VatFluxLog})
+		repository := &vat_flux_mocks.MockVatFluxRepository{}
+		fakeHeader := core.Header{BlockNumber: 1, Id: 2}
+		repository.SetMissingHeaders([]core.Header{fakeHeader})
+		transformer := vat_flux.VatFluxTransformer{
+			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_flux.VatFluxModel{test_data.VatFluxModel}))
+	})
+
+	It("returns error if repository returns error for create", func() {
+		converter := &vat_flux_mocks.MockVatFlux{}
+		fetcher := &mocks.MockLogFetcher{}
+		fetcher.SetFetchedLogs([]types.Log{test_data.VatFluxLog})
+		repository := &vat_flux_mocks.MockVatFluxRepository{}
+		repository.SetMissingHeaders([]core.Header{{BlockNumber: 1, Id: 2}})
+		repository.SetCreateError(fakes.FakeError)
+		transformer := vat_flux.VatFluxTransformer{
+			Fetcher:    fetcher,
+			Converter:  converter,
+			Repository: repository,
+		}
+
+		err := transformer.Execute()
+
+		Expect(err).To(HaveOccurred())
+		Expect(err).To(MatchError(fakes.FakeError))
+	})
+})

pkg/transformers/vat_flux/vat_flux_suite_test.go

@@ -0,0 +1,19 @@
+package vat_flux_test
+
+import (
+	"io/ioutil"
+	"log"
+	"testing"
+
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+)
+
+func TestVatFlux(t *testing.T) {
+	RegisterFailHandler(Fail)
+	RunSpecs(t, "VatFlux Suite")
+}
+
+var _ = BeforeSuite(func() {
+	log.SetOutput(ioutil.Discard)
+})

pkg/transformers/vat_grab/tranformer.go

@@ -36,7 +36,7 @@ func (transformer VatGrabTransformer) Execute() error {
 	if err != nil {
 		return err
 	}
-	log.Printf("Fetching vat init event logs for %d headers \n", len(missingHeaders))
+	log.Printf("Fetching vat grab event logs for %d headers \n", len(missingHeaders))
 	for _, header := range missingHeaders {
 		topics := [][]common.Hash{{common.HexToHash(shared.VatGrabSignature)}}
 		matchingLogs, err := transformer.Fetcher.FetchLogs(VatGrabConfig.ContractAddresses, topics, header.BlockNumber)

test_config/test_config.go

@@ -103,6 +103,7 @@ func CleanTestDB(db *postgres.DB) {
 	db.MustExec("DELETE FROM maker.vat_fold")
 	db.MustExec("DELETE FROM maker.vat_toll")
 	db.MustExec("DELETE FROM maker.vat_tune")
+	db.MustExec("DELETE FROM maker.vat_flux")
 	db.MustExec("DELETE FROM receipts")
 	db.MustExec("DELETE FROM transactions")
 	db.MustExec("DELETE FROM watched_contracts")