Add Vat grab transformer

cmd/continuousLogSync.go

@@ -104,6 +104,7 @@ func buildTransformerInitializerMap() map[string]shared2.TransformerInitializer
 	transformerInitializerMap["pitFileStabilityFee"] = transformers.PitFileStabilityFeeTransformerInitializer
 	transformerInitializerMap["priceFeed"] = transformers.PriceFeedTransformerInitializer
 	transformerInitializerMap["tend"] = transformers.TendTransformerInitializer
+	transformerInitializerMap["vatGrab"] = transformers.VatGrabTransformerInitializer
 	transformerInitializerMap["vatInit"] = transformers.VatInitTransformerInitializer
 	transformerInitializerMap["vatToll"] = transformers.VatTollTransformerInitializer
 	transformerInitializerMap["vatTune"] = transformers.VatTuneTransformerInitializer

db/migrations/1539033620_create_vat_grab.down.sql

@@ -0,0 +1,3 @@
+DROP TABLE maker.vat_grab;
+ALTER TABLE public.checked_headers
+  DROP COLUMN vat_grab_checked;

db/migrations/1539033620_create_vat_grab.up.sql

@@ -0,0 +1,16 @@
+CREATE TABLE maker.vat_grab (
+  id            SERIAL PRIMARY KEY,
+  header_id     INTEGER NOT NULL REFERENCES headers (id) ON DELETE CASCADE,
+  ilk           TEXT,
+  urn           TEXT,
+  v             TEXT,
+  w             TEXT,
+  dink          NUMERIC,
+  dart          NUMERIC,
+  tx_idx        INTEGER NOT NULL,
+  raw_log       JSONB,
+  UNIQUE (header_id, tx_idx)
+);
+
+ALTER TABLE public.checked_headers
+  ADD COLUMN vat_grab_checked BOOLEAN NOT NULL DEFAULT FALSE;

db/schema.sql

@@ -697,6 +697,44 @@ CREATE SEQUENCE maker.tend_id_seq
 ALTER SEQUENCE maker.tend_id_seq OWNED BY maker.tend.id;
 
 
+--
+-- Name: vat_grab; Type: TABLE; Schema: maker; Owner: -
+--
+
+CREATE TABLE maker.vat_grab (
+    id integer NOT NULL,
+    header_id integer NOT NULL,
+    ilk text,
+    urn text,
+    v text,
+    w text,
+    dink numeric,
+    dart numeric,
+    tx_idx integer NOT NULL,
+    raw_log jsonb
+);
+
+
+--
+-- Name: vat_grab_id_seq; Type: SEQUENCE; Schema: maker; Owner: -
+--
+
+CREATE SEQUENCE maker.vat_grab_id_seq
+    AS integer
+    START WITH 1
+    INCREMENT BY 1
+    NO MINVALUE
+    NO MAXVALUE
+    CACHE 1;
+
+
+--
+-- Name: vat_grab_id_seq; Type: SEQUENCE OWNED BY; Schema: maker; Owner: -
+--
+
+ALTER SEQUENCE maker.vat_grab_id_seq OWNED BY maker.vat_grab.id;
+
+
 --
 -- Name: vat_init; Type: TABLE; Schema: maker; Owner: -
 --
@@ -905,7 +943,8 @@ CREATE TABLE public.checked_headers (
     pit_file_stability_fee_checked boolean DEFAULT false NOT NULL,
     vat_init_checked boolean DEFAULT false NOT NULL,
     vat_toll_checked boolean DEFAULT false NOT NULL,
-    vat_tune_checked boolean DEFAULT false NOT NULL
+    vat_tune_checked boolean DEFAULT false NOT NULL,
+    vat_grab_checked boolean DEFAULT false NOT NULL
 );
 
 
@@ -1352,6 +1391,13 @@ ALTER TABLE ONLY maker.price_feeds ALTER COLUMN id SET DEFAULT nextval('maker.pr
 ALTER TABLE ONLY maker.tend ALTER COLUMN id SET DEFAULT nextval('maker.tend_id_seq'::regclass);
 
 
+--
+-- Name: vat_grab id; Type: DEFAULT; Schema: maker; Owner: -
+--
+
+ALTER TABLE ONLY maker.vat_grab ALTER COLUMN id SET DEFAULT nextval('maker.vat_grab_id_seq'::regclass);
+
+
 --
 -- Name: vat_init id; Type: DEFAULT; Schema: maker; Owner: -
 --
@@ -1731,6 +1777,22 @@ ALTER TABLE ONLY maker.tend
     ADD CONSTRAINT tend_pkey PRIMARY KEY (id);
 
 
+--
+-- Name: vat_grab vat_grab_header_id_tx_idx_key; Type: CONSTRAINT; Schema: maker; Owner: -
+--
+
+ALTER TABLE ONLY maker.vat_grab
+    ADD CONSTRAINT vat_grab_header_id_tx_idx_key UNIQUE (header_id, tx_idx);
+
+
+--
+-- Name: vat_grab vat_grab_pkey; Type: CONSTRAINT; Schema: maker; Owner: -
+--
+
+ALTER TABLE ONLY maker.vat_grab
+    ADD CONSTRAINT vat_grab_pkey PRIMARY KEY (id);
+
+
 --
 -- Name: vat_init vat_init_header_id_tx_idx_key; Type: CONSTRAINT; Schema: maker; Owner: -
 --
@@ -2077,6 +2139,14 @@ ALTER TABLE ONLY maker.tend
     ADD CONSTRAINT tend_header_id_fkey FOREIGN KEY (header_id) REFERENCES public.headers(id) ON DELETE CASCADE;
 
 
+--
+-- Name: vat_grab vat_grab_header_id_fkey; Type: FK CONSTRAINT; Schema: maker; Owner: -
+--
+
+ALTER TABLE ONLY maker.vat_grab
+    ADD CONSTRAINT vat_grab_header_id_fkey FOREIGN KEY (header_id) REFERENCES public.headers(id) ON DELETE CASCADE;
+
+
 --
 -- Name: vat_init vat_init_header_id_fkey; Type: FK CONSTRAINT; Schema: maker; Owner: -
 --

pkg/transformers/shared/constants.go

@@ -55,6 +55,7 @@ var (
 	pitFileIlkMethod          = "file(bytes32,bytes32,uint256)"
 	pitFileStabilityFeeMethod = GetSolidityMethodSignature(PitABI, "file")
 	tendMethod                = GetSolidityMethodSignature(FlipperABI, "tend")
+	vatGrabMethod             = GetSolidityMethodSignature(VatABI, "grab")
 	vatInitMethod             = GetSolidityMethodSignature(VatABI, "init")
 	vatTollMethod             = GetSolidityMethodSignature(VatABI, "toll")
 	vatTuneMethod             = GetSolidityMethodSignature(VatABI, "tune")
@@ -77,6 +78,7 @@ var (
 	PitFileIlkSignature          = GetLogNoteSignature(pitFileIlkMethod)
 	PitFileStabilityFeeSignature = GetLogNoteSignature(pitFileStabilityFeeMethod)
 	TendFunctionSignature        = GetLogNoteSignature(tendMethod)
+	VatGrabSignature             = GetLogNoteSignature(vatGrabMethod)
 	VatInitSignature             = GetLogNoteSignature(vatInitMethod)
 	VatTollSignature             = GetLogNoteSignature(vatTollMethod)
 	VatTuneSignature             = GetLogNoteSignature(vatTuneMethod)

pkg/transformers/shared/event_signature_generator_test.go

@@ -125,6 +125,13 @@ var _ = Describe("Event signature generator", func() {
 
 				Expect(expected).To(Equal(actual))
 			})
+
+			It("gets the vat grab method signature", func() {
+				expected := "grab(bytes32,bytes32,bytes32,bytes32,int256,int256)"
+				actual := shared.GetSolidityMethodSignature(shared.VatABI, "grab")
+
+				Expect(expected).To(Equal(actual))
+			})
 		})
 
 		Describe("it handles events", func() {

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

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

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

@@ -0,0 +1,56 @@
+package vat_grab
+
+import (
+	. "github.com/onsi/gomega"
+	"github.com/vulcanize/vulcanizedb/pkg/core"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/vat_grab"
+)
+
+type MockVatGrabRepository struct {
+	createErr                       error
+	markHeaderCheckedErr            error
+	markHeaderCheckedPassedHeaderID int64
+	missingHeaders                  []core.Header
+	missingHeadersErr               error
+	PassedStartingBlockNumber       int64
+	PassedEndingBlockNumber         int64
+	PassedHeaderID                  int64
+	PassedModels                    []vat_grab.VatGrabModel
+}
+
+func (repository *MockVatGrabRepository) Create(headerID int64, models []vat_grab.VatGrabModel) error {
+	repository.PassedHeaderID = headerID
+	repository.PassedModels = models
+	return repository.createErr
+}
+
+func (repository *MockVatGrabRepository) MarkHeaderChecked(headerID int64) error {
+	repository.markHeaderCheckedPassedHeaderID = headerID
+	return repository.markHeaderCheckedErr
+}
+
+func (repository *MockVatGrabRepository) MissingHeaders(startingBlockNumber, endingBlockNumber int64) ([]core.Header, error) {
+	repository.PassedStartingBlockNumber = startingBlockNumber
+	repository.PassedEndingBlockNumber = endingBlockNumber
+	return repository.missingHeaders, repository.missingHeadersErr
+}
+
+func (repository *MockVatGrabRepository) SetMissingHeadersErr(e error) {
+	repository.missingHeadersErr = e
+}
+
+func (repository *MockVatGrabRepository) SetMissingHeaders(headers []core.Header) {
+	repository.missingHeaders = headers
+}
+
+func (repository *MockVatGrabRepository) AssertMarkHeaderCheckedCalledWith(i int64) {
+	Expect(repository.markHeaderCheckedPassedHeaderID).To(Equal(i))
+}
+
+func (repository *MockVatGrabRepository) SetMarkHeaderCheckedErr(e error) {
+	repository.markHeaderCheckedErr = e
+}
+
+func (repository *MockVatGrabRepository) SetCreateError(e error) {
+	repository.createErr = e
+}

pkg/transformers/test_data/vat_grab.go

@@ -0,0 +1,39 @@
+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/shared"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/vat_grab"
+)
+
+var EthVatGrabLog = types.Log{
+	Address: common.HexToAddress(shared.VatContractAddress),
+	Topics: []common.Hash{
+		common.HexToHash("0x3690ae4c00000000000000000000000000000000000000000000000000000000"),
+		common.HexToHash("0x66616b6520696c6b000000000000000000000000000000000000000000000000"),
+		common.HexToHash("0x07fa9ef6609ca7921112231f8f195138ebba2977000000000000000000000000"),
+		common.HexToHash("0x7340e006f4135ba6970d43bf43d88dcad4e7a8ca000000000000000000000000"),
+	},
+	Data:        hexutil.MustDecode("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"),
+	BlockNumber: 23,
+	TxHash:      common.HexToHash("0x7cb84c750ce4985f7811abf641d52ffcb35306d943081475226484cf1470c6fa"),
+	TxIndex:     4,
+	BlockHash:   common.HexToHash("0xf5a367d560e14c4658ef85e4877e08b5560a4773b69b39f6b8025910b666fade"),
+	Index:       0,
+	Removed:     false,
+}
+
+var rawVatGrabLog, _ = json.Marshal(EthVatGrabLog)
+var VatGrabModel = vat_grab.VatGrabModel{
+	Ilk:              "fake ilk",
+	Urn:              "0x07Fa9eF6609cA7921112231F8f195138ebbA2977",
+	V:                "0x7340e006f4135BA6970D43bf43d88DCAD4e7a8CA",
+	W:                "0x7526EB4f95e2a1394797Cb38a921Fb1EbA09291B",
+	Dink:             "111111111",
+	Dart:             "222222222",
+	TransactionIndex: EthVatGrabLog.TxIndex,
+	Raw:              rawVatGrabLog,
+}

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_grab"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/vat_init"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/vat_toll"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/vat_tune"
@@ -64,6 +65,7 @@ var (
 	PitFileStabilityFeeTransformerInitializer = stability_fee.PitFileStabilityFeeTransformerInitializer{Config: pitFileConfig}.NewPitFileStabilityFeeTransformer
 	PriceFeedTransformerInitializer           = price_feeds.PriceFeedTransformerInitializer{Config: price_feeds.PriceFeedConfig}.NewPriceFeedTransformer
 	TendTransformerInitializer                = tend.TendTransformerInitializer{Config: tend.TendConfig}.NewTendTransformer
+	VatGrabTransformerInitializer             = vat_grab.VatGrabTransformerInitializer{Config: vat_grab.VatGrabConfig}.NewVatGrabTransformer
 	VatInitTransformerInitializer             = vat_init.VatInitTransformerInitializer{Config: vat_init.VatInitConfig}.NewVatInitTransformer
 	VatTollTransformerInitializer             = vat_toll.VatTollTransformerInitializer{Config: vat_toll.VatTollConfig}.NewVatTollTransformer
 	VatTuneTransformerInitializer             = vat_tune.VatTuneTransformerInitializer{Config: vat_tune.VatTuneConfig}.NewVatTuneTransformer
@@ -89,6 +91,7 @@ func TransformerInitializers() []shared.TransformerInitializer {
 		PitFileStabilityFeeTransformerInitializer,
 		PriceFeedTransformerInitializer,
 		TendTransformerInitializer,
+		VatGrabTransformerInitializer,
 		VatInitTransformerInitializer,
 		VatTollTransformerInitializer,
 		VatTuneTransformerInitializer,

pkg/transformers/vat_grab/config.go

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

pkg/transformers/vat_grab/converter.go

@@ -0,0 +1,63 @@
+package vat_grab
+
+import (
+	"bytes"
+	"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) ([]VatGrabModel, error)
+}
+
+type VatGrabConverter struct{}
+
+func (VatGrabConverter) ToModels(ethLogs []types.Log) ([]VatGrabModel, error) {
+	var models []VatGrabModel
+	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])
+		v := common.BytesToAddress(ethLog.Topics[3].Bytes()[:common.AddressLength])
+		wBytes := shared.GetDataBytesAtIndex(-3, ethLog.Data)
+		w := common.BytesToAddress(wBytes[:common.AddressLength])
+		dinkBytes := shared.GetDataBytesAtIndex(-2, ethLog.Data)
+		dink := big.NewInt(0).SetBytes(dinkBytes).String()
+		dartBytes := shared.GetDataBytesAtIndex(-1, ethLog.Data)
+		dart := big.NewInt(0).SetBytes(dartBytes).String()
+
+		raw, err := json.Marshal(ethLog)
+		if err != nil {
+			return nil, err
+		}
+		model := VatGrabModel{
+			Ilk:              ilk,
+			Urn:              urn.String(),
+			V:                v.String(),
+			W:                w.String(),
+			Dink:             dink,
+			Dart:             dart,
+			TransactionIndex: ethLog.TxIndex,
+			Raw:              raw,
+		}
+		models = append(models, model)
+	}
+	return models, nil
+}
+
+func verifyLog(log types.Log) error {
+	if len(log.Topics) < 4 {
+		return errors.New("log missing topics")
+	}
+	if len(log.Data) < shared.DataItemLength {
+		return errors.New("log missing data")
+	}
+	return nil
+}

pkg/transformers/vat_grab/converter_test.go

@@ -0,0 +1,47 @@
+package vat_grab_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_grab"
+)
+
+var _ = Describe("Vat grab converter", func() {
+	var converter vat_grab.Converter
+
+	BeforeEach(func() {
+		converter = vat_grab.VatGrabConverter{}
+	})
+
+	It("returns err if log is missing topics", func() {
+		badLog := types.Log{
+			Data: []byte{1, 1, 1, 1, 1},
+		}
+
+		_, err := converter.ToModels([]types.Log{badLog})
+
+		Expect(err).To(HaveOccurred())
+	})
+
+	It("returns err if log is missing data", func() {
+		badLog := types.Log{
+			Topics: []common.Hash{{}, {}, {}, {}},
+		}
+
+		_, err := converter.ToModels([]types.Log{badLog})
+
+		Expect(err).To(HaveOccurred())
+	})
+
+	It("converts a log to an model", func() {
+		models, err := converter.ToModels([]types.Log{test_data.EthVatGrabLog})
+
+		Expect(err).NotTo(HaveOccurred())
+		Expect(len(models)).To(Equal(1))
+		Expect(models[0]).To(Equal(test_data.VatGrabModel))
+	})
+})

pkg/transformers/vat_grab/model.go

@@ -0,0 +1,12 @@
+package vat_grab
+
+type VatGrabModel struct {
+	Ilk              string
+	Urn              string
+	V                string
+	W                string
+	Dink             string
+	Dart             string
+	TransactionIndex uint   `db:"tx_idx"`
+	Raw              []byte `db:"raw_log"`
+}

pkg/transformers/vat_grab/repository.go

@@ -0,0 +1,74 @@
+package vat_grab
+
+import (
+	"github.com/vulcanize/vulcanizedb/pkg/core"
+	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
+)
+
+type Repository interface {
+	Create(headerID int64, models []VatGrabModel) error
+	MarkHeaderChecked(headerID int64) error
+	MissingHeaders(startingBlockNumber, endingBlockNumber int64) ([]core.Header, error)
+}
+
+type VatGrabRepository struct {
+	db *postgres.DB
+}
+
+func NewVatGrabRepository(db *postgres.DB) VatGrabRepository {
+	return VatGrabRepository{
+		db: db,
+	}
+}
+
+func (repository VatGrabRepository) Create(headerID int64, models []VatGrabModel) error {
+	tx, err := repository.db.Begin()
+	if err != nil {
+		return err
+	}
+	for _, model := range models {
+		_, err = tx.Exec(
+			`INSERT into maker.vat_grab (header_id, ilk, urn, v, w, dink, dart, tx_idx, raw_log)
+	   VALUES($1, $2, $3, $4, $5, $6::NUMERIC, $7::NUMERIC, $8, $9)`,
+			headerID, model.Ilk, model.Urn, model.V, model.W, model.Dink, model.Dart, model.TransactionIndex, model.Raw,
+		)
+		if err != nil {
+			tx.Rollback()
+			return err
+		}
+	}
+	_, err = tx.Exec(`INSERT INTO public.checked_headers (header_id, vat_grab_checked)
+		VALUES ($1, $2)
+	ON CONFLICT (header_id) DO
+		UPDATE SET vat_grab_checked = $2`, headerID, true)
+	if err != nil {
+		tx.Rollback()
+		return err
+	}
+	return tx.Commit()
+}
+
+func (repository VatGrabRepository) MarkHeaderChecked(headerID int64) error {
+	_, err := repository.db.Exec(`INSERT INTO public.checked_headers (header_id, vat_grab_checked)
+		VALUES ($1, $2)
+	ON CONFLICT (header_id) DO
+		UPDATE SET vat_grab_checked = $2`, headerID, true)
+	return err
+}
+
+func (repository VatGrabRepository) 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_grab_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
+}

pkg/transformers/vat_grab/repository_test.go

@@ -0,0 +1,205 @@
+package vat_grab_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_grab"
+	"github.com/vulcanize/vulcanizedb/test_config"
+)
+
+var _ = Describe("Vat grab repository", func() {
+	Describe("Create", func() {
+		var (
+			db                *postgres.DB
+			vatGrabRepository vat_grab.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())
+			vatGrabRepository = vat_grab.NewVatGrabRepository(db)
+		})
+
+		It("adds a vat grab event", func() {
+			err = vatGrabRepository.Create(headerID, []vat_grab.VatGrabModel{test_data.VatGrabModel})
+
+			Expect(err).NotTo(HaveOccurred())
+			var dbVatGrab vat_grab.VatGrabModel
+			err = db.Get(&dbVatGrab, `SELECT ilk, urn, v, w, dink, dart, tx_idx, raw_log FROM maker.vat_grab WHERE header_id = $1`, headerID)
+			Expect(err).NotTo(HaveOccurred())
+			Expect(dbVatGrab.Ilk).To(Equal(test_data.VatGrabModel.Ilk))
+			Expect(dbVatGrab.Urn).To(Equal(test_data.VatGrabModel.Urn))
+			Expect(dbVatGrab.V).To(Equal(test_data.VatGrabModel.V))
+			Expect(dbVatGrab.W).To(Equal(test_data.VatGrabModel.W))
+			Expect(dbVatGrab.Dink).To(Equal(test_data.VatGrabModel.Dink))
+			Expect(dbVatGrab.Dart).To(Equal(test_data.VatGrabModel.Dart))
+			Expect(dbVatGrab.TransactionIndex).To(Equal(test_data.VatGrabModel.TransactionIndex))
+			Expect(dbVatGrab.Raw).To(MatchJSON(test_data.VatGrabModel.Raw))
+		})
+
+		It("marks header as checked for logs", func() {
+			err = vatGrabRepository.Create(headerID, []vat_grab.VatGrabModel{test_data.VatGrabModel})
+
+			Expect(err).NotTo(HaveOccurred())
+			var headerChecked bool
+			err = db.Get(&headerChecked, `SELECT vat_grab_checked FROM public.checked_headers WHERE header_id = $1`, headerID)
+			Expect(err).NotTo(HaveOccurred())
+			Expect(headerChecked).To(BeTrue())
+		})
+
+		It("does not duplicate pit file vat_grab events", func() {
+			err = vatGrabRepository.Create(headerID, []vat_grab.VatGrabModel{test_data.VatGrabModel})
+
+			Expect(err).NotTo(HaveOccurred())
+			err = vatGrabRepository.Create(headerID, []vat_grab.VatGrabModel{test_data.VatGrabModel})
+			Expect(err).To(HaveOccurred())
+			Expect(err.Error()).To(ContainSubstring("pq: duplicate key value violates unique constraint"))
+		})
+
+		It("removes pit file vat_grab if corresponding header is deleted", func() {
+			err = vatGrabRepository.Create(headerID, []vat_grab.VatGrabModel{test_data.VatGrabModel})
+			Expect(err).NotTo(HaveOccurred())
+
+			_, err = db.Exec(`DELETE FROM headers WHERE id = $1`, headerID)
+
+			Expect(err).NotTo(HaveOccurred())
+			var dbVatGrab vat_grab.VatGrabModel
+			err = db.Get(&dbVatGrab, `SELECT ilk, urn, v, w, dink, dart, tx_idx, raw_log FROM maker.vat_grab WHERE header_id = $1`, headerID)
+			Expect(err).To(HaveOccurred())
+			Expect(err).To(MatchError(sql.ErrNoRows))
+		})
+	})
+
+	Describe("MarkHeaderChecked", func() {
+		var (
+			db                *postgres.DB
+			vatGrabRepository vat_grab.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())
+			vatGrabRepository = vat_grab.NewVatGrabRepository(db)
+		})
+
+		It("creates a row for a new headerID", func() {
+			err = vatGrabRepository.MarkHeaderChecked(headerID)
+
+			Expect(err).NotTo(HaveOccurred())
+			var headerChecked bool
+			err = db.Get(&headerChecked, `SELECT vat_grab_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 = vatGrabRepository.MarkHeaderChecked(headerID)
+
+			Expect(err).NotTo(HaveOccurred())
+			var headerChecked bool
+			err = db.Get(&headerChecked, `SELECT vat_grab_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)
+			vatGrabBlockNumber := int64(2)
+			endingBlockNumber := int64(3)
+			blockNumbers := []int64{startingBlockNumber, vatGrabBlockNumber, 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())
+			}
+			vatGrabRepository := vat_grab.NewVatGrabRepository(db)
+			err := vatGrabRepository.MarkHeaderChecked(headerIDs[1])
+			Expect(err).NotTo(HaveOccurred())
+
+			headers, err := vatGrabRepository.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 grab logs have been checked", func() {
+			db := test_config.NewTestDB(core.Node{})
+			test_config.CleanTestDB(db)
+			headerRepository := repositories.NewHeaderRepository(db)
+			startingBlockNumber := int64(1)
+			vatGrabdBlockNumber := int64(2)
+			endingBlockNumber := int64(3)
+			blockNumbers := []int64{startingBlockNumber, vatGrabdBlockNumber, 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())
+			}
+			vatGrabRepository := vat_grab.NewVatGrabRepository(db)
+			_, err := db.Exec(`INSERT INTO public.checked_headers (header_id) VALUES ($1)`, headerIDs[1])
+			Expect(err).NotTo(HaveOccurred())
+
+			headers, err := vatGrabRepository.MissingHeaders(startingBlockNumber, endingBlockNumber)
+
+			Expect(err).NotTo(HaveOccurred())
+			Expect(len(headers)).To(Equal(3))
+			Expect(headers[0].BlockNumber).To(Or(Equal(startingBlockNumber), Equal(endingBlockNumber), Equal(vatGrabdBlockNumber)))
+			Expect(headers[1].BlockNumber).To(Or(Equal(startingBlockNumber), Equal(endingBlockNumber), Equal(vatGrabdBlockNumber)))
+			Expect(headers[2].BlockNumber).To(Or(Equal(startingBlockNumber), Equal(endingBlockNumber), Equal(vatGrabdBlockNumber)))
+		})
+
+		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())
+			}
+			vatGrabRepository := vat_grab.NewVatGrabRepository(db)
+			vatGrabRepositoryTwo := vat_grab.NewVatGrabRepository(dbTwo)
+			err := vatGrabRepository.MarkHeaderChecked(headerIDs[0])
+			Expect(err).NotTo(HaveOccurred())
+
+			nodeOneMissingHeaders, err := vatGrabRepository.MissingHeaders(blockNumbers[0], blockNumbers[len(blockNumbers)-1])
+			Expect(err).NotTo(HaveOccurred())
+			Expect(len(nodeOneMissingHeaders)).To(Equal(len(blockNumbers) - 1))
+
+			nodeTwoMissingHeaders, err := vatGrabRepositoryTwo.MissingHeaders(blockNumbers[0], blockNumbers[len(blockNumbers)-1])
+			Expect(err).NotTo(HaveOccurred())
+			Expect(len(nodeTwoMissingHeaders)).To(Equal(len(blockNumbers)))
+		})
+	})
+})

pkg/transformers/vat_grab/tranformer.go

@@ -0,0 +1,63 @@
+package vat_grab
+
+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 VatGrabTransformerInitializer struct {
+	Config shared.TransformerConfig
+}
+
+func (initializer VatGrabTransformerInitializer) NewVatGrabTransformer(db *postgres.DB, blockChain core.BlockChain) shared.Transformer {
+	converter := VatGrabConverter{}
+	fetcher := shared.NewFetcher(blockChain)
+	repository := NewVatGrabRepository(db)
+	return VatGrabTransformer{
+		Config:     initializer.Config,
+		Converter:  converter,
+		Fetcher:    fetcher,
+		Repository: repository,
+	}
+}
+
+type VatGrabTransformer struct {
+	Config     shared.TransformerConfig
+	Converter  Converter
+	Fetcher    shared.LogFetcher
+	Repository Repository
+}
+
+func (transformer VatGrabTransformer) Execute() error {
+	missingHeaders, err := transformer.Repository.MissingHeaders(transformer.Config.StartingBlockNumber, transformer.Config.EndingBlockNumber)
+	if err != nil {
+		return err
+	}
+	log.Printf("Fetching vat init event logs for %d headers \n", len(missingHeaders))
+	for _, header := range missingHeaders {
+		topics := [][]common.Hash{{common.HexToHash(shared.VatGrabSignature)}}
+		matchingLogs, err := transformer.Fetcher.FetchLogs(VatGrabConfig.ContractAddresses, topics, header.BlockNumber)
+		if err != nil {
+			return err
+		}
+		if len(matchingLogs) < 1 {
+			err = transformer.Repository.MarkHeaderChecked(header.Id)
+			if err != nil {
+				return err
+			}
+			continue
+		}
+		models, err := transformer.Converter.ToModels(matchingLogs)
+		if err != nil {
+			return err
+		}
+		err = transformer.Repository.Create(header.Id, models)
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}

pkg/transformers/vat_grab/transformer_test.go

@@ -0,0 +1,196 @@
+package vat_grab_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_grab_mocks "github.com/vulcanize/vulcanizedb/pkg/transformers/test_data/mocks/vat_grab"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/vat_grab"
+)
+
+var _ = Describe("Vat grab transformer", func() {
+	It("gets missing headers for block numbers specified in config", func() {
+		repository := &vat_grab_mocks.MockVatGrabRepository{}
+		transformer := vat_grab.VatGrabTransformer{
+			Config:     vat_grab.VatGrabConfig,
+			Fetcher:    &mocks.MockLogFetcher{},
+			Converter:  &vat_grab_mocks.MockVatGrabConverter{},
+			Repository: repository,
+		}
+
+		err := transformer.Execute()
+
+		Expect(err).NotTo(HaveOccurred())
+		Expect(repository.PassedStartingBlockNumber).To(Equal(vat_grab.VatGrabConfig.StartingBlockNumber))
+		Expect(repository.PassedEndingBlockNumber).To(Equal(vat_grab.VatGrabConfig.EndingBlockNumber))
+	})
+
+	It("returns error if repository returns error for missing headers", func() {
+		repository := &vat_grab_mocks.MockVatGrabRepository{}
+		repository.SetMissingHeadersErr(fakes.FakeError)
+		transformer := vat_grab.VatGrabTransformer{
+			Fetcher:    &mocks.MockLogFetcher{},
+			Converter:  &vat_grab_mocks.MockVatGrabConverter{},
+			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_grab_mocks.MockVatGrabRepository{}
+		repository.SetMissingHeaders([]core.Header{{BlockNumber: 1}, {BlockNumber: 2}})
+		transformer := vat_grab.VatGrabTransformer{
+			Fetcher:    fetcher,
+			Converter:  &vat_grab_mocks.MockVatGrabConverter{},
+			Repository: repository,
+		}
+
+		err := transformer.Execute()
+
+		Expect(err).NotTo(HaveOccurred())
+		Expect(fetcher.FetchedBlocks).To(Equal([]int64{1, 2}))
+		Expect(fetcher.FetchedContractAddresses).To(Equal([][]string{vat_grab.VatGrabConfig.ContractAddresses, vat_grab.VatGrabConfig.ContractAddresses}))
+		Expect(fetcher.FetchedTopics).To(Equal([][]common.Hash{{common.HexToHash(shared.VatGrabSignature)}}))
+	})
+
+	It("returns error if fetcher returns error", func() {
+		fetcher := &mocks.MockLogFetcher{}
+		fetcher.SetFetcherError(fakes.FakeError)
+		repository := &vat_grab_mocks.MockVatGrabRepository{}
+		repository.SetMissingHeaders([]core.Header{{BlockNumber: 1}})
+		transformer := vat_grab.VatGrabTransformer{
+			Fetcher:    fetcher,
+			Converter:  &vat_grab_mocks.MockVatGrabConverter{},
+			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_grab_mocks.MockVatGrabConverter{}
+		mockRepository := &vat_grab_mocks.MockVatGrabRepository{}
+		headerID := int64(123)
+		mockRepository.SetMissingHeaders([]core.Header{{Id: headerID}})
+		mockFetcher := &mocks.MockLogFetcher{}
+		transformer := vat_grab.VatGrabTransformer{
+			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_grab_mocks.MockVatGrabConverter{}
+		mockRepository := &vat_grab_mocks.MockVatGrabRepository{}
+		mockRepository.SetMissingHeaders([]core.Header{{Id: int64(123)}})
+		mockRepository.SetMarkHeaderCheckedErr(fakes.FakeError)
+		mockFetcher := &mocks.MockLogFetcher{}
+		transformer := vat_grab.VatGrabTransformer{
+			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_grab_mocks.MockVatGrabConverter{}
+		fetcher := &mocks.MockLogFetcher{}
+		fetcher.SetFetchedLogs([]types.Log{test_data.EthVatGrabLog})
+		repository := &vat_grab_mocks.MockVatGrabRepository{}
+		repository.SetMissingHeaders([]core.Header{{BlockNumber: 1}})
+		transformer := vat_grab.VatGrabTransformer{
+			Fetcher:    fetcher,
+			Converter:  converter,
+			Repository: repository,
+		}
+
+		err := transformer.Execute()
+
+		Expect(err).NotTo(HaveOccurred())
+		Expect(converter.PassedLogs).To(Equal([]types.Log{test_data.EthVatGrabLog}))
+	})
+
+	It("returns error if converter returns error", func() {
+		converter := &vat_grab_mocks.MockVatGrabConverter{}
+		converter.SetConverterError(fakes.FakeError)
+		fetcher := &mocks.MockLogFetcher{}
+		fetcher.SetFetchedLogs([]types.Log{test_data.EthVatGrabLog})
+		repository := &vat_grab_mocks.MockVatGrabRepository{}
+		repository.SetMissingHeaders([]core.Header{{BlockNumber: 1}})
+		transformer := vat_grab.VatGrabTransformer{
+			Fetcher:    fetcher,
+			Converter:  converter,
+			Repository: repository,
+		}
+
+		err := transformer.Execute()
+
+		Expect(err).To(HaveOccurred())
+		Expect(err).To(MatchError(fakes.FakeError))
+	})
+
+	It("persists vat grab model", func() {
+		converter := &vat_grab_mocks.MockVatGrabConverter{}
+		fetcher := &mocks.MockLogFetcher{}
+		fetcher.SetFetchedLogs([]types.Log{test_data.EthVatGrabLog})
+		repository := &vat_grab_mocks.MockVatGrabRepository{}
+		fakeHeader := core.Header{BlockNumber: 1, Id: 2}
+		repository.SetMissingHeaders([]core.Header{fakeHeader})
+		transformer := vat_grab.VatGrabTransformer{
+			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_grab.VatGrabModel{test_data.VatGrabModel}))
+	})
+
+	It("returns error if repository returns error for create", func() {
+		converter := &vat_grab_mocks.MockVatGrabConverter{}
+		fetcher := &mocks.MockLogFetcher{}
+		fetcher.SetFetchedLogs([]types.Log{test_data.EthVatGrabLog})
+		repository := &vat_grab_mocks.MockVatGrabRepository{}
+		repository.SetMissingHeaders([]core.Header{{BlockNumber: 1, Id: 2}})
+		repository.SetCreateError(fakes.FakeError)
+		transformer := vat_grab.VatGrabTransformer{
+			Fetcher:    fetcher,
+			Converter:  converter,
+			Repository: repository,
+		}
+
+		err := transformer.Execute()
+
+		Expect(err).To(HaveOccurred())
+		Expect(err).To(MatchError(fakes.FakeError))
+	})
+})

pkg/transformers/vat_grab/vat_grab_suite_test.go

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

test_config/test_config.go

@@ -89,6 +89,7 @@ func CleanTestDB(db *postgres.DB) {
 	db.MustExec("DELETE FROM maker.pit_file_stability_fee")
 	db.MustExec("DELETE FROM maker.price_feeds")
 	db.MustExec("DELETE FROM maker.tend")
+	db.MustExec("DELETE FROM maker.vat_grab")
 	db.MustExec("DELETE FROM maker.vat_init")
 	db.MustExec("DELETE FROM maker.vat_toll")
 	db.MustExec("DELETE FROM maker.vat_tune")