VDB-117: Add Vow.flog transformer (#80)

* Add DB migrations for flog

* Add Vow addresses and constants

* Add err logging to ABI signature getter, test for flog sig

* Add flog transformer

* Add tests+data for flog transformer

* Prepend DB tables and columns with vow_

* Panic on failure to get method sig

cmd/continuousLogSync.go

@@ -97,6 +97,7 @@ func buildTransformerInitializerMap() map[string]shared2.TransformerInitializer
 	transformerInitializerMap[shared2.DripFileRepoLabel] = transformers.DripFileRepoTransformerInitializer
 	transformerInitializerMap[shared2.DripFileVowLabel] = transformers.DripFileVowTransfromerInitializer
 	transformerInitializerMap[shared2.FlipKickLabel] = transformers.FlipKickTransformerInitializer
+	transformerInitializerMap[shared2.FlogLabel] = transformers.FlogTransformerInitializer
 	transformerInitializerMap[shared2.FlopKickLabel] = transformers.FlopKickTransformerInitializer
 	transformerInitializerMap[shared2.FrobLabel] = transformers.FrobTransformerInitializer
 	transformerInitializerMap[shared2.PitFileDebtCeilingLabel] = transformers.PitFileDebtCeilingTransformerInitializer

db/migrations/1540297136_add_flog.down.sql

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

db/migrations/1540297136_add_flog.up.sql

@@ -0,0 +1,12 @@
+CREATE TABLE maker.vow_flog (
+  id          SERIAL PRIMARY KEY,
+  header_id   INTEGER NOT NULL REFERENCES headers (id) ON DELETE CASCADE,
+  era         INTEGER NOT NULL,
+  log_idx     INTEGER NOT NULL,
+  tx_idx      INTEGER NOT NULL,
+  raw_log     JSONB,
+  UNIQUE (header_id, tx_idx, log_idx)
+);
+
+ALTER TABLE public.checked_headers
+  ADD COLUMN vow_flog_checked BOOLEAN NOT NULL DEFAULT FALSE;

db/schema.sql

@@ -1044,6 +1044,40 @@ CREATE SEQUENCE maker.vat_tune_id_seq
 ALTER SEQUENCE maker.vat_tune_id_seq OWNED BY maker.vat_tune.id;
 
 
+--
+-- Name: vow_flog; Type: TABLE; Schema: maker; Owner: -
+--
+
+CREATE TABLE maker.vow_flog (
+    id integer NOT NULL,
+    header_id integer NOT NULL,
+    era integer NOT NULL,
+    log_idx integer NOT NULL,
+    tx_idx integer NOT NULL,
+    raw_log jsonb
+);
+
+
+--
+-- Name: vow_flog_id_seq; Type: SEQUENCE; Schema: maker; Owner: -
+--
+
+CREATE SEQUENCE maker.vow_flog_id_seq
+    AS integer
+    START WITH 1
+    INCREMENT BY 1
+    NO MINVALUE
+    NO MAXVALUE
+    CACHE 1;
+
+
+--
+-- Name: vow_flog_id_seq; Type: SEQUENCE OWNED BY; Schema: maker; Owner: -
+--
+
+ALTER SEQUENCE maker.vow_flog_id_seq OWNED BY maker.vow_flog.id;
+
+
 --
 -- Name: logs; Type: TABLE; Schema: public; Owner: -
 --
@@ -1152,7 +1186,8 @@ CREATE TABLE public.checked_headers (
     vat_tune_checked boolean DEFAULT false NOT NULL,
     vat_grab_checked boolean DEFAULT false NOT NULL,
     vat_flux_checked boolean DEFAULT false NOT NULL,
-    vat_slip_checked boolean DEFAULT false NOT NULL
+    vat_slip_checked boolean DEFAULT false NOT NULL,
+    vow_flog_checked boolean DEFAULT false NOT NULL
 );
 
 
@@ -1663,6 +1698,13 @@ ALTER TABLE ONLY maker.vat_toll ALTER COLUMN id SET DEFAULT nextval('maker.vat_t
 ALTER TABLE ONLY maker.vat_tune ALTER COLUMN id SET DEFAULT nextval('maker.vat_tune_id_seq'::regclass);
 
 
+--
+-- Name: vow_flog id; Type: DEFAULT; Schema: maker; Owner: -
+--
+
+ALTER TABLE ONLY maker.vow_flog ALTER COLUMN id SET DEFAULT nextval('maker.vow_flog_id_seq'::regclass);
+
+
 --
 -- Name: blocks id; Type: DEFAULT; Schema: public; Owner: -
 --
@@ -2165,6 +2207,22 @@ ALTER TABLE ONLY maker.vat_tune
     ADD CONSTRAINT vat_tune_pkey PRIMARY KEY (id);
 
 
+--
+-- Name: vow_flog vow_flog_header_id_tx_idx_log_idx_key; Type: CONSTRAINT; Schema: maker; Owner: -
+--
+
+ALTER TABLE ONLY maker.vow_flog
+    ADD CONSTRAINT vow_flog_header_id_tx_idx_log_idx_key UNIQUE (header_id, tx_idx, log_idx);
+
+
+--
+-- Name: vow_flog vow_flog_pkey; Type: CONSTRAINT; Schema: maker; Owner: -
+--
+
+ALTER TABLE ONLY maker.vow_flog
+    ADD CONSTRAINT vow_flog_pkey PRIMARY KEY (id);
+
+
 --
 -- Name: blocks blocks_pkey; Type: CONSTRAINT; Schema: public; Owner: -
 --
@@ -2535,6 +2593,14 @@ ALTER TABLE ONLY maker.vat_tune
     ADD CONSTRAINT vat_tune_header_id_fkey FOREIGN KEY (header_id) REFERENCES public.headers(id) ON DELETE CASCADE;
 
 
+--
+-- Name: vow_flog vow_flog_header_id_fkey; Type: FK CONSTRAINT; Schema: maker; Owner: -
+--
+
+ALTER TABLE ONLY maker.vow_flog
+    ADD CONSTRAINT vow_flog_header_id_fkey FOREIGN KEY (header_id) REFERENCES public.headers(id) ON DELETE CASCADE;
+
+
 --
 -- Name: transactions blocks_fk; Type: FK CONSTRAINT; Schema: public; Owner: -
 --

environments/private.toml

@@ -16,3 +16,4 @@ pip = "0x9FfFE440258B79c5d6604001674A4722FfC0f7Bc"
 pit = "0xe7cf3198787c9a4daac73371a38f29aaeeced87e"
 rep = "0xf88bbdc1e2718f8857f30a180076ec38d53cf296"
 vat = "0xcd726790550afcd77e9a7a47e86a3f9010af126b"
+vow = "0x76189df410263ad1d9fe2f4af2eab3d24f1b6f41"

environments/staging.toml

@@ -21,3 +21,4 @@ pip = "0x9FfFE440258B79c5d6604001674A4722FfC0f7Bc"
 pit = "0xe7cf3198787c9a4daac73371a38f29aaeeced87e"
 rep = "0xf88bbdc1e2718f8857f30a180076ec38d53cf296"
 vat = "0xcd726790550afcd77e9a7a47e86a3f9010af126b"
+vow = "0x3728e9777B2a0a611ee0F89e00E01044ce4736d1"

pkg/transformers/flog/config.go

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

pkg/transformers/flog/converter.go

@@ -0,0 +1,60 @@
+// 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 flog
+
+import (
+	"encoding/json"
+	"errors"
+	"github.com/ethereum/go-ethereum/core/types"
+
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
+)
+
+type FlogConverter struct{}
+
+func (FlogConverter) ToModels(ethLogs []types.Log) ([]interface{}, error) {
+	var models []interface{}
+	for _, ethLog := range ethLogs {
+		err := verifyLog(ethLog)
+		if err != nil {
+			return nil, err
+		}
+
+		era := ethLog.Topics[2].Big()
+
+		raw, err := json.Marshal(ethLog)
+		if err != nil {
+			return nil, err
+		}
+		model := FlogModel{
+			Era:              era.String(),
+			LogIndex:         ethLog.Index,
+			TransactionIndex: ethLog.TxIndex,
+			Raw:              raw,
+		}
+		models = append(models, model)
+	}
+	return models, nil
+}
+
+func verifyLog(log types.Log) error {
+	if len(log.Topics) < 3 {
+		return errors.New("log missing topics")
+	}
+	if len(log.Data) < shared.DataItemLength {
+		return errors.New("log missing data")
+	}
+	return nil
+}

pkg/transformers/flog/converter_test.go

@@ -0,0 +1,58 @@
+// 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 flog_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/flog"
+
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/test_data"
+)
+
+var _ = Describe("Flog converter", func() {
+	var converter flog.FlogConverter
+	BeforeEach(func() {
+		converter = flog.FlogConverter{}
+	})
+
+	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 a model", func() {
+		models, err := converter.ToModels([]types.Log{test_data.EthFlogLog})
+
+		Expect(err).NotTo(HaveOccurred())
+		Expect(len(models)).To(Equal(1))
+		Expect(models[0].(flog.FlogModel)).To(Equal(test_data.FlogModel))
+	})
+})

pkg/transformers/flog/flog_suite_test.go

@@ -0,0 +1,33 @@
+// 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 flog
+
+import (
+	"testing"
+
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+	"io/ioutil"
+	"log"
+)
+
+func TestFlog(t *testing.T) {
+	RegisterFailHandler(Fail)
+	RunSpecs(t, "Flog Suite")
+}
+
+var _ = BeforeSuite(func() {
+	log.SetOutput(ioutil.Discard)
+})

pkg/transformers/flog/model.go

@@ -0,0 +1,22 @@
+// 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 flog
+
+type FlogModel struct {
+	Era              string
+	LogIndex         uint   `db:"log_idx"`
+	TransactionIndex uint   `db:"tx_idx"`
+	Raw              []byte `db:"raw_log"`
+}

pkg/transformers/flog/repository.go

@@ -0,0 +1,90 @@
+// 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 flog
+
+import (
+	"fmt"
+	"github.com/vulcanize/vulcanizedb/pkg/core"
+	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
+)
+
+type FlogRepository struct {
+	db *postgres.DB
+}
+
+func (repository FlogRepository) Create(headerID int64, models []interface{}) error {
+	tx, err := repository.db.Begin()
+	if err != nil {
+		return err
+	}
+
+	for _, model := range models {
+		flog, ok := model.(FlogModel)
+		if !ok {
+			tx.Rollback()
+			return fmt.Errorf("model of type %T, not %T", model, FlogModel{})
+		}
+
+		_, err = tx.Exec(
+			`INSERT into maker.vow_flog (header_id, era, log_idx, tx_idx, raw_log)
+			VALUES($1, $2::NUMERIC, $3, $4, $5)`,
+			headerID, flog.Era, flog.LogIndex, flog.TransactionIndex, flog.Raw,
+		)
+
+		if err != nil {
+			tx.Rollback()
+			return err
+		}
+	}
+	_, err = tx.Exec(`INSERT INTO public.checked_headers (header_id, vow_flog_checked)
+		VALUES ($1, $2)
+		ON CONFLICT (header_id) DO
+			UPDATE SET vow_flog_checked = $2`, headerID, true)
+
+	if err != nil {
+		tx.Rollback()
+		return err
+	}
+	return tx.Commit()
+}
+
+func (repository FlogRepository) MarkHeaderChecked(headerID int64) error {
+	_, err := repository.db.Exec(`INSERT INTO public.checked_headers (header_id, vow_flog_checked)
+		VALUES ($1, $2)
+		ON CONFLICT (header_id) DO
+			UPDATE SET vow_flog_checked = $2`, headerID, true)
+	return err
+}
+
+func (repository FlogRepository) 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 vow_flog_checked IS FALSE)
+			AND headers.block_number >= $1
+			AND headers.block_number <= $2
+			AND headers.eth_node_fingerprint = $3`,
+		startingBlockNumber,
+		endingBlockNumber,
+		repository.db.Node.ID,
+	)
+	return result, err
+}
+
+func (repository *FlogRepository) SetDB(db *postgres.DB) {
+	repository.db = db
+}

pkg/transformers/flog/repository_test.go

@@ -0,0 +1,218 @@
+// 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 flog_test
+
+import (
+	"database/sql"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/flog"
+	"math/rand"
+
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+
+	"github.com/vulcanize/vulcanizedb/pkg/core"
+	"github.com/vulcanize/vulcanizedb/pkg/datastore"
+	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
+	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres/repositories"
+	"github.com/vulcanize/vulcanizedb/pkg/fakes"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/test_data"
+	"github.com/vulcanize/vulcanizedb/test_config"
+)
+
+var _ = Describe("Flog repository", func() {
+	var (
+		db               *postgres.DB
+		flogRepository   flog.FlogRepository
+		err              error
+		headerRepository datastore.HeaderRepository
+	)
+
+	BeforeEach(func() {
+		db = test_config.NewTestDB(core.Node{})
+		test_config.CleanTestDB(db)
+		headerRepository = repositories.NewHeaderRepository(db)
+		flogRepository = flog.FlogRepository{}
+		flogRepository.SetDB(db)
+	})
+
+	Describe("Create", func() {
+		var headerID int64
+
+		BeforeEach(func() {
+			headerID, err = headerRepository.CreateOrUpdateHeader(fakes.FakeHeader)
+			Expect(err).NotTo(HaveOccurred())
+		})
+
+		It("adds a flog event", func() {
+			err = flogRepository.Create(headerID, []interface{}{test_data.FlogModel})
+			Expect(err).NotTo(HaveOccurred())
+
+			var dbFlog flog.FlogModel
+			err = db.Get(&dbFlog, `SELECT era, log_idx, tx_idx, raw_log FROM maker.vow_flog WHERE header_id = $1`, headerID)
+			Expect(err).NotTo(HaveOccurred())
+			Expect(dbFlog.Era).To(Equal(test_data.FlogModel.Era))
+			Expect(dbFlog.LogIndex).To(Equal(test_data.FlogModel.LogIndex))
+			Expect(dbFlog.TransactionIndex).To(Equal(test_data.FlogModel.TransactionIndex))
+			Expect(dbFlog.Raw).To(MatchJSON(test_data.FlogModel.Raw))
+		})
+
+		It("marks header as checked for logs", func() {
+			err = flogRepository.Create(headerID, []interface{}{test_data.FlogModel})
+			Expect(err).NotTo(HaveOccurred())
+
+			var headerChecked bool
+			err = db.Get(&headerChecked, `SELECT vow_flog_checked FROM public.checked_headers WHERE header_id = $1`, headerID)
+			Expect(err).NotTo(HaveOccurred())
+			Expect(headerChecked).To(BeTrue())
+		})
+
+		It("updates the header to checked if checked headers row already exists", func() {
+			_, err = db.Exec(`INSERT INTO public.checked_headers (header_id) VALUES ($1)`, headerID)
+			Expect(err).NotTo(HaveOccurred())
+
+			err = flogRepository.Create(headerID, []interface{}{test_data.FlogModel})
+
+			Expect(err).NotTo(HaveOccurred())
+			var headerChecked bool
+			err = db.Get(&headerChecked, `SELECT vow_flog_checked FROM public.checked_headers WHERE header_id = $1`, headerID)
+			Expect(err).NotTo(HaveOccurred())
+			Expect(headerChecked).To(BeTrue())
+		})
+
+		It("does not duplicate flog events", func() {
+			err = flogRepository.Create(headerID, []interface{}{test_data.FlogModel})
+			Expect(err).NotTo(HaveOccurred())
+
+			err = flogRepository.Create(headerID, []interface{}{test_data.FlogModel})
+			Expect(err).To(HaveOccurred())
+			Expect(err.Error()).To(ContainSubstring("pq: duplicate key value violates unique constraint"))
+		})
+
+		It("removes flog events if corresponding header is deleted", func() {
+			_, err = db.Exec(`DELETE FROM headers WHERE id = $1`, headerID)
+
+			Expect(err).NotTo(HaveOccurred())
+			var dbFlog flog.FlogModel
+			err = db.Get(&dbFlog, `SELECT era, log_idx, tx_idx, raw_log FROM maker.vow_flog WHERE header_id = $1`, headerID)
+			Expect(err).To(HaveOccurred())
+			Expect(err).To(MatchError(sql.ErrNoRows))
+		})
+
+		It("Returns an error if model is of wrong type", func() {
+			err = flogRepository.Create(headerID, []interface{}{test_data.WrongModel{}})
+			Expect(err).To(HaveOccurred())
+			Expect(err.Error()).To(ContainSubstring("model of type"))
+		})
+	})
+
+	Describe("MarkHeaderChecked", func() {
+		var headerID int64
+
+		BeforeEach(func() {
+			headerID, err = headerRepository.CreateOrUpdateHeader(fakes.FakeHeader)
+			Expect(err).NotTo(HaveOccurred())
+		})
+
+		It("creates a row for a new headerID", func() {
+			err = flogRepository.MarkHeaderChecked(headerID)
+
+			Expect(err).NotTo(HaveOccurred())
+			var headerChecked bool
+			err = db.Get(&headerChecked, `SELECT vow_flog_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 = flogRepository.MarkHeaderChecked(headerID)
+
+			Expect(err).NotTo(HaveOccurred())
+			var headerChecked bool
+			err = db.Get(&headerChecked, `SELECT vow_flog_checked FROM public.checked_headers WHERE header_id = $1`, headerID)
+			Expect(err).NotTo(HaveOccurred())
+			Expect(headerChecked).To(BeTrue())
+		})
+	})
+
+	Describe("MissingHeaders", func() {
+		var (
+			startingBlockNumber, flogBlockNumber, endingBlockNumber int64
+			blockNumbers, headerIDs                                 []int64
+		)
+
+		BeforeEach(func() {
+			startingBlockNumber = rand.Int63()
+			flogBlockNumber = startingBlockNumber + 1
+			endingBlockNumber = startingBlockNumber + 2
+
+			blockNumbers = []int64{startingBlockNumber, flogBlockNumber, endingBlockNumber, endingBlockNumber + 1}
+
+			headerIDs = []int64{}
+			for _, n := range blockNumbers {
+				headerID, err := headerRepository.CreateOrUpdateHeader(fakes.GetFakeHeader(n))
+				Expect(err).NotTo(HaveOccurred())
+				headerIDs = append(headerIDs, headerID)
+			}
+		})
+
+		It("returns headers that haven't been checked", func() {
+			err := flogRepository.MarkHeaderChecked(headerIDs[1])
+			Expect(err).NotTo(HaveOccurred())
+
+			headers, err := flogRepository.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 flog logs have been checked", func() {
+			_, err := db.Exec(`INSERT INTO public.checked_headers (header_id) VALUES ($1)`, headerIDs[1])
+			Expect(err).NotTo(HaveOccurred())
+
+			headers, err := flogRepository.MissingHeaders(startingBlockNumber, endingBlockNumber)
+
+			Expect(err).NotTo(HaveOccurred())
+			Expect(len(headers)).To(Equal(3))
+			Expect(headers[0].BlockNumber).To(Or(Equal(startingBlockNumber), Equal(endingBlockNumber), Equal(flogBlockNumber)))
+			Expect(headers[1].BlockNumber).To(Or(Equal(startingBlockNumber), Equal(endingBlockNumber), Equal(flogBlockNumber)))
+			Expect(headers[2].BlockNumber).To(Or(Equal(startingBlockNumber), Equal(endingBlockNumber), Equal(flogBlockNumber)))
+		})
+
+		It("only returns headers associated with the current node", func() {
+			dbTwo := test_config.NewTestDB(core.Node{ID: "second"})
+			headerRepositoryTwo := repositories.NewHeaderRepository(dbTwo)
+			for _, n := range blockNumbers {
+				_, err = headerRepositoryTwo.CreateOrUpdateHeader(fakes.GetFakeHeader(n))
+				Expect(err).NotTo(HaveOccurred())
+			}
+			flogRepositoryTwo := flog.FlogRepository{}
+			flogRepositoryTwo.SetDB(dbTwo)
+			err := flogRepository.MarkHeaderChecked(headerIDs[0])
+			Expect(err).NotTo(HaveOccurred())
+
+			nodeOneMissingHeaders, err := flogRepository.MissingHeaders(blockNumbers[0], blockNumbers[len(blockNumbers)-1])
+			Expect(err).NotTo(HaveOccurred())
+			Expect(len(nodeOneMissingHeaders)).To(Equal(len(blockNumbers) - 1))
+
+			nodeTwoMissingHeaders, err := flogRepositoryTwo.MissingHeaders(blockNumbers[0], blockNumbers[len(blockNumbers)-1])
+			Expect(err).NotTo(HaveOccurred())
+			Expect(len(nodeTwoMissingHeaders)).To(Equal(len(blockNumbers)))
+		})
+	})
+})

pkg/transformers/flog/transformer_test.go

@@ -0,0 +1,165 @@
+// 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 flog_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/factories"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/flog"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/test_data"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/test_data/mocks"
+	flog_mocks "github.com/vulcanize/vulcanizedb/pkg/transformers/test_data/mocks/flog"
+	"math/rand"
+)
+
+var _ = Describe("Flog transformer", func() {
+	var config = flog.FlogConfig
+	var fetcher mocks.MockLogFetcher
+	var converter flog_mocks.MockFlogConverter
+	var repository flog_mocks.MockFlogRepository
+	var transformer shared.Transformer
+	var headerOne core.Header
+	var headerTwo core.Header
+
+	BeforeEach(func() {
+		fetcher = mocks.MockLogFetcher{}
+		converter = flog_mocks.MockFlogConverter{}
+		repository = flog_mocks.MockFlogRepository{}
+		headerOne = core.Header{Id: rand.Int63(), BlockNumber: rand.Int63()}
+		headerTwo = core.Header{Id: rand.Int63(), BlockNumber: rand.Int63()}
+		transformer = factories.Transformer{
+			Config:     config,
+			Converter:  &converter,
+			Fetcher:    &fetcher,
+			Repository: &repository,
+		}.NewTransformer(nil, nil)
+	})
+
+	It("sets the blockchain and database", func() {
+		Expect(fetcher.SetBcCalled).To(BeTrue())
+		Expect(repository.SetDbCalled).To(BeTrue())
+	})
+
+	It("gets missing headers for block numbers specified in config", func() {
+		err := transformer.Execute()
+
+		Expect(err).NotTo(HaveOccurred())
+		Expect(repository.PassedStartingBlockNumber).To(Equal(config.StartingBlockNumber))
+		Expect(repository.PassedEndingBlockNumber).To(Equal(config.EndingBlockNumber))
+	})
+
+	It("returns error if repository returns error for missing headers", func() {
+		repository.SetMissingHeadersError(fakes.FakeError)
+
+		err := transformer.Execute()
+
+		Expect(err).To(HaveOccurred())
+		Expect(err).To(MatchError(fakes.FakeError))
+	})
+
+	It("fetches logs for missing headers", func() {
+		repository.SetMissingHeaders([]core.Header{headerOne, headerTwo})
+
+		err := transformer.Execute()
+
+		Expect(err).NotTo(HaveOccurred())
+		Expect(fetcher.FetchedBlocks).To(Equal([]int64{headerOne.BlockNumber, headerTwo.BlockNumber}))
+		Expect(fetcher.FetchedContractAddresses).To(Equal([][]string{
+			config.ContractAddresses,
+			config.ContractAddresses,
+		}))
+		Expect(fetcher.FetchedTopics).To(Equal([][]common.Hash{{common.HexToHash(shared.FlogSignature)}}))
+	})
+
+	It("returns error if fetcher returns error", func() {
+		fetcher.SetFetcherError(fakes.FakeError)
+		repository.SetMissingHeaders([]core.Header{headerOne})
+
+		err := transformer.Execute()
+
+		Expect(err).To(HaveOccurred())
+		Expect(err).To(MatchError(fakes.FakeError))
+	})
+
+	It("converts matching logs", func() {
+		fetcher.SetFetchedLogs([]types.Log{test_data.EthFlogLog})
+		repository.SetMissingHeaders([]core.Header{headerOne})
+
+		err := transformer.Execute()
+
+		Expect(err).NotTo(HaveOccurred())
+		Expect(converter.PassedLogs).To(Equal([]types.Log{test_data.EthFlogLog}))
+	})
+
+	It("returns error if converter returns error", func() {
+		converter.SetConverterError(fakes.FakeError)
+		fetcher.SetFetchedLogs([]types.Log{test_data.EthFlogLog})
+		repository.SetMissingHeaders([]core.Header{headerOne})
+
+		err := transformer.Execute()
+
+		Expect(err).To(HaveOccurred())
+		Expect(err).To(MatchError(fakes.FakeError))
+	})
+
+	It("marks header as checked even if no logs were returned", func() {
+		repository.SetMissingHeaders([]core.Header{headerOne, headerTwo})
+		fetcher.SetFetchedLogs([]types.Log{})
+
+		err := transformer.Execute()
+		Expect(err).NotTo(HaveOccurred())
+		Expect(repository.CheckedHeaderIDs).To(ContainElement(headerOne.Id))
+		Expect(repository.CheckedHeaderIDs).To(ContainElement(headerTwo.Id))
+	})
+
+	It("returns error if marking header checked returns err", func() {
+		repository.SetMissingHeaders([]core.Header{headerOne, headerTwo})
+		repository.SetCheckedHeaderError(fakes.FakeError)
+		fetcher.SetFetchedLogs([]types.Log{})
+
+		err := transformer.Execute()
+
+		Expect(err).To(HaveOccurred())
+		Expect(err).To(MatchError(fakes.FakeError))
+	})
+
+	It("persists flog model", func() {
+		fetcher.SetFetchedLogs([]types.Log{test_data.EthFlogLog})
+		repository.SetMissingHeaders([]core.Header{headerOne})
+
+		err := transformer.Execute()
+
+		Expect(err).NotTo(HaveOccurred())
+		Expect(repository.PassedHeaderID).To(Equal(headerOne.Id))
+		Expect(repository.PassedModels).To(Equal([]interface{}{test_data.FlogModel}))
+	})
+
+	It("returns error if repository returns error for create", func() {
+		fetcher.SetFetchedLogs([]types.Log{test_data.EthFlogLog})
+		repository.SetMissingHeaders([]core.Header{headerOne})
+		repository.SetCreateError(fakes.FakeError)
+
+		err := transformer.Execute()
+
+		Expect(err).To(HaveOccurred())
+		Expect(err).To(MatchError(fakes.FakeError))
+	})
+})

pkg/transformers/shared/constants.go

@@ -14,7 +14,9 @@
 
 package shared
 
-import "github.com/spf13/viper"
+import (
+	"github.com/spf13/viper"
+)
 
 func getContractValue(key string, fallback string) string {
 	value := viper.GetString(key)
@@ -30,10 +32,11 @@ var (
 	CatABI        = `[{"constant":true,"inputs":[],"name":"vat","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function","signature":"0x36569e77"},{"constant":true,"inputs":[],"name":"vow","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function","signature":"0x626cb3c5"},{"constant":true,"inputs":[{"name":"","type":"uint256"}],"name":"flips","outputs":[{"name":"ilk","type":"bytes32"},{"name":"urn","type":"bytes32"},{"name":"ink","type":"uint256"},{"name":"tab","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function","signature":"0x70d9235a"},{"constant":true,"inputs":[],"name":"nflip","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function","signature":"0x76181a51"},{"constant":true,"inputs":[],"name":"live","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function","signature":"0x957aa58c"},{"constant":true,"inputs":[{"name":"","type":"address"}],"name":"wards","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function","signature":"0xbf353dbb"},{"constant":true,"inputs":[{"name":"","type":"bytes32"}],"name":"ilks","outputs":[{"name":"flip","type":"address"},{"name":"chop","type":"uint256"},{"name":"lump","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function","signature":"0xd9638d36"},{"constant":true,"inputs":[],"name":"pit","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function","signature":"0xf03c7c6e"},{"inputs":[{"name":"vat_","type":"address"}],"payable":false,"stateMutability":"nonpayable","type":"constructor","signature":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"name":"ilk","type":"bytes32"},{"indexed":true,"name":"urn","type":"bytes32"},{"indexed":false,"name":"ink","type":"uint256"},{"indexed":false,"name":"art","type":"uint256"},{"indexed":false,"name":"tab","type":"uint256"},{"indexed":false,"name":"flip","type":"uint256"},{"indexed":false,"name":"iArt","type":"uint256"}],"name":"Bite","type":"event","signature":"0x99b5620489b6ef926d4518936cfec15d305452712b88bd59da2d9c10fb0953e8"},{"anonymous":true,"inputs":[{"indexed":true,"name":"sig","type":"bytes4"},{"indexed":true,"name":"guy","type":"address"},{"indexed":true,"name":"foo","type":"bytes32"},{"indexed":true,"name":"bar","type":"bytes32"},{"indexed":false,"name":"wad","type":"uint256"},{"indexed":false,"name":"fax","type":"bytes"}],"name":"LogNote","type":"event","signature":"0x644843f351d3fba4abcd60109eaff9f54bac8fb8ccf0bab941009c21df21cf31"},{"constant":false,"inputs":[{"name":"guy","type":"address"}],"name":"rely","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function","signature":"0x65fae35e"},{"constant":false,"inputs":[{"name":"guy","type":"address"}],"name":"deny","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function","signature":"0x9c52a7f1"},{"constant":false,"inputs":[{"name":"ilk","type":"bytes32"},{"name":"what","type":"bytes32"},{"name":"data","type":"uint256"}],"name":"file","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function","signature":"0x1a0b287e"},{"constant":false,"inputs":[{"name":"what","type":"bytes32"},{"name":"data","type":"address"}],"name":"file","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function","signature":"0xd4e8be83"},{"constant":false,"inputs":[{"name":"ilk","type":"bytes32"},{"name":"what","type":"bytes32"},{"name":"flip","type":"address"}],"name":"file","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function","signature":"0xebecb39d"},{"constant":false,"inputs":[{"name":"ilk","type":"bytes32"},{"name":"urn","type":"bytes32"}],"name":"bite","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"nonpayable","type":"function","signature":"0x72f7b593"},{"constant":false,"inputs":[{"name":"n","type":"uint256"},{"name":"wad","type":"uint256"}],"name":"flip","outputs":[{"name":"id","type":"uint256"}],"payable":false,"stateMutability":"nonpayable","type":"function","signature":"0xe6f95917"}]`
 	DripABI       = `[{"constant":true,"inputs":[],"name":"vat","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function","signature":"0x36569e77"},{"constant":true,"inputs":[],"name":"repo","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function","signature":"0x56ff3122"},{"constant":true,"inputs":[{"name":"","type":"address"}],"name":"wards","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function","signature":"0xbf353dbb"},{"constant":true,"inputs":[{"name":"","type":"bytes32"}],"name":"ilks","outputs":[{"name":"vow","type":"bytes32"},{"name":"tax","type":"uint256"},{"name":"rho","type":"uint48"}],"payable":false,"stateMutability":"view","type":"function","signature":"0xd9638d36"},{"inputs":[{"name":"vat_","type":"address"}],"payable":false,"stateMutability":"nonpayable","type":"constructor","signature":"constructor"},{"anonymous":true,"inputs":[{"indexed":true,"name":"sig","type":"bytes4"},{"indexed":true,"name":"guy","type":"address"},{"indexed":true,"name":"foo","type":"bytes32"},{"indexed":true,"name":"bar","type":"bytes32"},{"indexed":false,"name":"wad","type":"uint256"},{"indexed":false,"name":"fax","type":"bytes"}],"name":"LogNote","type":"event","signature":"0x644843f351d3fba4abcd60109eaff9f54bac8fb8ccf0bab941009c21df21cf31"},{"constant":false,"inputs":[{"name":"guy","type":"address"}],"name":"rely","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function","signature":"0x65fae35e"},{"constant":false,"inputs":[{"name":"guy","type":"address"}],"name":"deny","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function","signature":"0x9c52a7f1"},{"constant":true,"inputs":[],"name":"era","outputs":[{"name":"","type":"uint48"}],"payable":false,"stateMutability":"view","type":"function","signature":"0x143e55e0"},{"constant":false,"inputs":[{"name":"ilk","type":"bytes32"},{"name":"vow","type":"bytes32"},{"name":"tax","type":"uint256"}],"name":"file","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function","signature":"0x1a0b287e"},{"constant":false,"inputs":[{"name":"what","type":"bytes32"},{"name":"data","type":"uint256"}],"name":"file","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function","signature":"0x29ae8114"},{"constant":false,"inputs":[{"name":"ilk","type":"bytes32"}],"name":"drip","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function","signature":"0x44e2a5a8"}]`
 	FlipperABI    = `[{"constant":true,"inputs":[{"name":"","type":"uint256"}],"name":"bids","outputs":[{"name":"bid","type":"uint256"},{"name":"lot","type":"uint256"},{"name":"guy","type":"address"},{"name":"tic","type":"uint48"},{"name":"end","type":"uint48"},{"name":"urn","type":"bytes32"},{"name":"gal","type":"address"},{"name":"tab","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function","signature":"0x4423c5f1"},{"constant":true,"inputs":[],"name":"ttl","outputs":[{"name":"","type":"uint48"}],"payable":false,"stateMutability":"view","type":"function","signature":"0x4e8b1dd5"},{"constant":true,"inputs":[],"name":"gem","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function","signature":"0x7bd2bea7"},{"constant":true,"inputs":[],"name":"beg","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function","signature":"0x7d780d82"},{"constant":true,"inputs":[],"name":"tau","outputs":[{"name":"","type":"uint48"}],"payable":false,"stateMutability":"view","type":"function","signature":"0xcfc4af55"},{"constant":true,"inputs":[],"name":"kicks","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function","signature":"0xcfdd3302"},{"constant":true,"inputs":[],"name":"dai","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function","signature":"0xf4b9fa75"},{"inputs":[{"name":"dai_","type":"address"},{"name":"gem_","type":"address"}],"payable":false,"stateMutability":"nonpayable","type":"constructor","signature":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"name":"id","type":"uint256"},{"indexed":false,"name":"lot","type":"uint256"},{"indexed":false,"name":"bid","type":"uint256"},{"indexed":false,"name":"gal","type":"address"},{"indexed":false,"name":"end","type":"uint48"},{"indexed":true,"name":"urn","type":"bytes32"},{"indexed":false,"name":"tab","type":"uint256"}],"name":"Kick","type":"event","signature":"0xbac86238bdba81d21995024470425ecb370078fa62b7271b90cf28cbd1e3e87e"},{"anonymous":true,"inputs":[{"indexed":true,"name":"sig","type":"bytes4"},{"indexed":true,"name":"guy","type":"address"},{"indexed":true,"name":"foo","type":"bytes32"},{"indexed":true,"name":"bar","type":"bytes32"},{"indexed":false,"name":"wad","type":"uint256"},{"indexed":false,"name":"fax","type":"bytes"}],"name":"LogNote","type":"event","signature":"0x644843f351d3fba4abcd60109eaff9f54bac8fb8ccf0bab941009c21df21cf31"},{"constant":true,"inputs":[],"name":"era","outputs":[{"name":"","type":"uint48"}],"payable":false,"stateMutability":"view","type":"function","signature":"0x143e55e0"},{"constant":false,"inputs":[{"name":"urn","type":"bytes32"},{"name":"gal","type":"address"},{"name":"tab","type":"uint256"},{"name":"lot","type":"uint256"},{"name":"bid","type":"uint256"}],"name":"kick","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"nonpayable","type":"function","signature":"0xeae19d9e"},{"constant":false,"inputs":[{"name":"id","type":"uint256"}],"name":"tick","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function","signature":"0xfc7b6aee"},{"constant":false,"inputs":[{"name":"id","type":"uint256"},{"name":"lot","type":"uint256"},{"name":"bid","type":"uint256"}],"name":"tend","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function","signature":"0x4b43ed12"},{"constant":false,"inputs":[{"name":"id","type":"uint256"},{"name":"lot","type":"uint256"},{"name":"bid","type":"uint256"}],"name":"dent","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function","signature":"0x5ff3a382"},{"constant":false,"inputs":[{"name":"id","type":"uint256"}],"name":"deal","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function","signature":"0xc959c42b"}]`
-	FlopperABI    = "[{\"constant\":true,\"inputs\":[],\"name\":\"era\",\"outputs\":[{\"name\":\"\",\"type\":\"uint48\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"name\":\"\",\"type\":\"uint256\"}],\"name\":\"bids\",\"outputs\":[{\"name\":\"bid\",\"type\":\"uint256\"},{\"name\":\"lot\",\"type\":\"uint256\"},{\"name\":\"guy\",\"type\":\"address\"},{\"name\":\"tic\",\"type\":\"uint48\"},{\"name\":\"end\",\"type\":\"uint48\"},{\"name\":\"vow\",\"type\":\"address\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"ttl\",\"outputs\":[{\"name\":\"\",\"type\":\"uint48\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"name\":\"id\",\"type\":\"uint256\"},{\"name\":\"lot\",\"type\":\"uint256\"},{\"name\":\"bid\",\"type\":\"uint256\"}],\"name\":\"dent\",\"outputs\":[],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"name\":\"guy\",\"type\":\"address\"}],\"name\":\"rely\",\"outputs\":[],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"gem\",\"outputs\":[{\"name\":\"\",\"type\":\"address\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"beg\",\"outputs\":[{\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"name\":\"guy\",\"type\":\"address\"}],\"name\":\"deny\",\"outputs\":[],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"name\":\"gal\",\"type\":\"address\"},{\"name\":\"lot\",\"type\":\"uint256\"},{\"name\":\"bid\",\"type\":\"uint256\"}],\"name\":\"kick\",\"outputs\":[{\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"name\":\"\",\"type\":\"address\"}],\"name\":\"wards\",\"outputs\":[{\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"name\":\"id\",\"type\":\"uint256\"}],\"name\":\"deal\",\"outputs\":[],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"tau\",\"outputs\":[{\"name\":\"\",\"type\":\"uint48\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"kicks\",\"outputs\":[{\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"dai\",\"outputs\":[{\"name\":\"\",\"type\":\"address\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"name\":\"dai_\",\"type\":\"address\"},{\"name\":\"gem_\",\"type\":\"address\"}],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"constructor\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"name\":\"id\",\"type\":\"uint256\"},{\"indexed\":false,\"name\":\"lot\",\"type\":\"uint256\"},{\"indexed\":false,\"name\":\"bid\",\"type\":\"uint256\"},{\"indexed\":false,\"name\":\"gal\",\"type\":\"address\"},{\"indexed\":false,\"name\":\"end\",\"type\":\"uint48\"}],\"name\":\"Kick\",\"type\":\"event\"},{\"anonymous\":true,\"inputs\":[{\"indexed\":true,\"name\":\"sig\",\"type\":\"bytes4\"},{\"indexed\":true,\"name\":\"guy\",\"type\":\"address\"},{\"indexed\":true,\"name\":\"foo\",\"type\":\"bytes32\"},{\"indexed\":true,\"name\":\"bar\",\"type\":\"bytes32\"},{\"indexed\":false,\"name\":\"wad\",\"type\":\"uint256\"},{\"indexed\":false,\"name\":\"fax\",\"type\":\"bytes\"}],\"name\":\"LogNote\",\"type\":\"event\"}]"
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 	PitABI        = `[{"constant":true,"inputs":[],"name":"vat","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function","signature":"0x36569e77"},{"constant":true,"inputs":[],"name":"live","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function","signature":"0x957aa58c"},{"constant":true,"inputs":[],"name":"drip","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function","signature":"0x9f678cca"},{"constant":true,"inputs":[],"name":"Line","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function","signature":"0xbabe8a3f"},{"constant":true,"inputs":[{"name":"","type":"address"}],"name":"wards","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function","signature":"0xbf353dbb"},{"constant":true,"inputs":[{"name":"","type":"bytes32"}],"name":"ilks","outputs":[{"name":"spot","type":"uint256"},{"name":"line","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function","signature":"0xd9638d36"},{"inputs":[{"name":"vat_","type":"address"}],"payable":false,"stateMutability":"nonpayable","type":"constructor","signature":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"name":"ilk","type":"bytes32"},{"indexed":true,"name":"urn","type":"bytes32"},{"indexed":false,"name":"ink","type":"uint256"},{"indexed":false,"name":"art","type":"uint256"},{"indexed":false,"name":"dink","type":"int256"},{"indexed":false,"name":"dart","type":"int256"},{"indexed":false,"name":"iArt","type":"uint256"}],"name":"Frob","type":"event","signature":"0xb2afa28318bcc689926b52835d844de174ef8de97e982a85c0199d584920791b"},{"anonymous":true,"inputs":[{"indexed":true,"name":"sig","type":"bytes4"},{"indexed":true,"name":"guy","type":"address"},{"indexed":true,"name":"foo","type":"bytes32"},{"indexed":true,"name":"bar","type":"bytes32"},{"indexed":false,"name":"wad","type":"uint256"},{"indexed":false,"name":"fax","type":"bytes"}],"name":"LogNote","type":"event","signature":"0x644843f351d3fba4abcd60109eaff9f54bac8fb8ccf0bab941009c21df21cf31"},{"constant":false,"inputs":[{"name":"guy","type":"address"}],"name":"rely","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function","signature":"0x65fae35e"},{"constant":false,"inputs":[{"name":"guy","type":"address"}],"name":"deny","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function","signature":"0x9c52a7f1"},{"constant":false,"inputs":[{"name":"ilk","type":"bytes32"},{"name":"what","type":"bytes32"},{"name":"data","type":"uint256"}],"name":"file","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function","signature":"0x1a0b287e"},{"constant":false,"inputs":[{"name":"what","type":"bytes32"},{"name":"data","type":"uint256"}],"name":"file","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function","signature":"0x29ae8114"},{"constant":false,"inputs":[{"name":"what","type":"bytes32"},{"name":"data","type":"address"}],"name":"file","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function","signature":"0xd4e8be83"},{"constant":false,"inputs":[{"name":"ilk","type":"bytes32"},{"name":"dink","type":"int256"},{"name":"dart","type":"int256"}],"name":"frob","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function","signature":"0x5a984ded"}]`
 	VatABI        = `[{"constant":true,"inputs":[],"name":"debt","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function","signature":"0x0dca59c1"},{"constant":true,"inputs":[{"name":"","type":"bytes32"},{"name":"","type":"bytes32"}],"name":"urns","outputs":[{"name":"ink","type":"uint256"},{"name":"art","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function","signature":"0x26e27482"},{"constant":true,"inputs":[],"name":"vice","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function","signature":"0x2d61a355"},{"constant":true,"inputs":[{"name":"","type":"bytes32"}],"name":"sin","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function","signature":"0xa60f1d3e"},{"constant":true,"inputs":[{"name":"","type":"address"}],"name":"wards","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function","signature":"0xbf353dbb"},{"constant":true,"inputs":[{"name":"","type":"bytes32"},{"name":"","type":"bytes32"}],"name":"gem","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function","signature":"0xc0912683"},{"constant":true,"inputs":[{"name":"","type":"bytes32"}],"name":"ilks","outputs":[{"name":"take","type":"uint256"},{"name":"rate","type":"uint256"},{"name":"Ink","type":"uint256"},{"name":"Art","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function","signature":"0xd9638d36"},{"constant":true,"inputs":[{"name":"","type":"bytes32"}],"name":"dai","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function","signature":"0xf53e4e69"},{"inputs":[],"payable":false,"stateMutability":"nonpayable","type":"constructor","signature":"constructor"},{"anonymous":true,"inputs":[{"indexed":true,"name":"sig","type":"bytes4"},{"indexed":true,"name":"foo","type":"bytes32"},{"indexed":true,"name":"bar","type":"bytes32"},{"indexed":true,"name":"too","type":"bytes32"},{"indexed":false,"name":"fax","type":"bytes"}],"name":"Note","type":"event","signature":"0x8c2dbbc2b33ffaa77c104b777e574a8a4ff79829dfee8b66f4dc63e3f8067152"},{"constant":false,"inputs":[{"name":"guy","type":"address"}],"name":"rely","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function","signature":"0x65fae35e"},{"constant":false,"inputs":[{"name":"guy","type":"address"}],"name":"deny","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function","signature":"0x9c52a7f1"},{"constant":false,"inputs":[{"name":"ilk","type":"bytes32"}],"name":"init","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function","signature":"0x3b663195"},{"constant":false,"inputs":[{"name":"ilk","type":"bytes32"},{"name":"guy","type":"bytes32"},{"name":"rad","type":"int256"}],"name":"slip","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function","signature":"0x42066cbb"},{"constant":false,"inputs":[{"name":"ilk","type":"bytes32"},{"name":"src","type":"bytes32"},{"name":"dst","type":"bytes32"},{"name":"rad","type":"int256"}],"name":"flux","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function","signature":"0xa6e41821"},{"constant":false,"inputs":[{"name":"src","type":"bytes32"},{"name":"dst","type":"bytes32"},{"name":"rad","type":"int256"}],"name":"move","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function","signature":"0x78f19470"},{"constant":false,"inputs":[{"name":"i","type":"bytes32"},{"name":"u","type":"bytes32"},{"name":"v","type":"bytes32"},{"name":"w","type":"bytes32"},{"name":"dink","type":"int256"},{"name":"dart","type":"int256"}],"name":"tune","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function","signature":"0x5dd6471a"},{"constant":false,"inputs":[{"name":"i","type":"bytes32"},{"name":"u","type":"bytes32"},{"name":"v","type":"bytes32"},{"name":"w","type":"bytes32"},{"name":"dink","type":"int256"},{"name":"dart","type":"int256"}],"name":"grab","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function","signature":"0x3690ae4c"},{"constant":false,"inputs":[{"name":"u","type":"bytes32"},{"name":"v","type":"bytes32"},{"name":"rad","type":"int256"}],"name":"heal","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function","signature":"0x990a5f63"},{"constant":false,"inputs":[{"name":"i","type":"bytes32"},{"name":"u","type":"bytes32"},{"name":"rate","type":"int256"}],"name":"fold","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function","signature":"0xe6a6a64d"},{"constant":false,"inputs":[{"name":"i","type":"bytes32"},{"name":"u","type":"bytes32"},{"name":"take","type":"int256"}],"name":"toll","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function","signature":"0x09b7a0b5"}]`
+	VowABI        = `[{"constant":true,"inputs":[],"name":"Awe","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"Joy","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"flap","outputs":[{"name":"id","type":"uint256"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"hump","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"wad","type":"uint256"}],"name":"kiss","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"what","type":"bytes32"},{"name":"data","type":"uint256"}],"name":"file","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"Ash","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"era","type":"uint48"}],"name":"flog","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"vat","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"Woe","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"wait","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"guy","type":"address"}],"name":"rely","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"bump","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"tab","type":"uint256"}],"name":"fess","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"row","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"","type":"uint48"}],"name":"sin","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"guy","type":"address"}],"name":"deny","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[],"name":"flop","outputs":[{"name":"id","type":"uint256"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"","type":"address"}],"name":"wards","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"sump","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"Sin","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"what","type":"bytes32"},{"name":"addr","type":"address"}],"name":"file","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"cow","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"wad","type":"uint256"}],"name":"heal","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"inputs":[],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"anonymous":true,"inputs":[{"indexed":true,"name":"sig","type":"bytes4"},{"indexed":true,"name":"guy","type":"address"},{"indexed":true,"name":"foo","type":"bytes32"},{"indexed":true,"name":"bar","type":"bytes32"},{"indexed":false,"name":"wad","type":"uint256"},{"indexed":false,"name":"fax","type":"bytes"}],"name":"LogNote","type":"event"}]`
 
 	// temporary addresses from Kovan deployment
 	CatContractAddress     = getContractValue("contract.cat", "0x2f34f22a00ee4b7a8f8bbc4eaee1658774c624e0")
@@ -45,6 +48,7 @@ var (
 	PitContractAddress     = getContractValue("contract.pit", "0xe7cf3198787c9a4daac73371a38f29aaeeced87e")
 	RepContractAddress     = getContractValue("contract.rep", "0xf88bbdc1e2718f8857f30a180076ec38d53cf296")
 	VatContractAddress     = getContractValue("contract.vat", "0xcd726790550afcd77e9a7a47e86a3f9010af126b")
+	VowContractAddress     = getContractValue("contract.vow", "0x3728e9777B2a0a611ee0F89e00E01044ce4736d1")
 
 	//TODO: get pit and drip file method signatures directly from the ABI
 	biteMethod                = GetSolidityMethodSignature(CatABI, "Bite")
@@ -58,6 +62,7 @@ var (
 	dripFileRepoMethod        = GetSolidityMethodSignature(DripABI, "file")
 	dripFileVowMethod         = "file(bytes32,bytes32)"
 	flipKickMethod            = GetSolidityMethodSignature(FlipperABI, "Kick")
+	flogMethod                = GetSolidityMethodSignature(VowABI, "flog")
 	flopKickMethod            = GetSolidityMethodSignature(FlopperABI, "Kick")
 	frobMethod                = GetSolidityMethodSignature(PitABI, "Frob")
 	logValueMethod            = GetSolidityMethodSignature(MedianizerABI, "LogValue")
@@ -86,6 +91,7 @@ var (
 	DripFileRepoSignature        = GetLogNoteSignature(dripFileRepoMethod)
 	DripFileVowSignature         = GetLogNoteSignature(dripFileVowMethod)
 	FlipKickSignature            = GetEventSignature(flipKickMethod)
+	FlogSignature                = GetLogNoteSignature(flogMethod)
 	FlopKickSignature            = GetEventSignature(flopKickMethod)
 	FrobSignature                = GetEventSignature(frobMethod)
 	LogValueSignature            = GetEventSignature(logValueMethod)
@@ -114,6 +120,7 @@ var (
 	DripFileRepoLabel        = "dripFileRepo"
 	DripFileVowLabel         = "dripFileVow"
 	FlipKickLabel            = "flipKick"
+	FlogLabel                = "flog"
 	FlopKickLabel            = "flopKick"
 	FrobLabel                = "frob"
 	PitFileDebtCeilingLabel  = "pitFileDebtCeiling"

pkg/transformers/shared/event_signature_generator.go

@@ -43,8 +43,7 @@ func GetSolidityMethodSignature(abi, name string) string {
 	} else if event, ok := parsedAbi.Events[name]; ok {
 		return getEventSignature(event)
 	}
-	return ""
-
+	panic("Error: could not get Solidity method signature for: " + name)
 }
 
 func getEventSignature(event abi.Event) string {

pkg/transformers/shared/event_signature_generator_test.go

@@ -167,6 +167,13 @@ var _ = Describe("Event signature generator", func() {
 
 				Expect(expected).To(Equal(actual))
 			})
+
+			It("gets the flog method signature", func() {
+				expected := "flog(uint48)"
+				actual := shared.GetSolidityMethodSignature(shared.VowABI, "flog")
+
+				Expect(expected).To(Equal(actual))
+			})
 		})
 
 		Describe("it handles events", func() {

pkg/transformers/test_data/flog.go

@@ -0,0 +1,50 @@
+// 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/flog"
+
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
+)
+
+var EthFlogLog = types.Log{
+	Address: common.HexToAddress(shared.VowContractAddress),
+	Topics: []common.Hash{
+		common.HexToHash("0x35aee16f00000000000000000000000000000000000000000000000000000000"),
+		common.HexToHash("0x0000000000000000000000008e84a1e068d77059cbe263c43ad0cdc130863313"),
+		common.HexToHash("0x0000000000000000000000000000000000000000000000000000000000000539"),
+		common.HexToHash("0x0000000000000000000000000000000000000000000000000000000000000000"),
+	},
+	Data:        hexutil.MustDecode("0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000002435aee16f0000000000000000000000000000000000000000000000000000000000000539"),
+	BlockNumber: 11,
+	TxHash:      common.HexToHash("0x47ffd75c1cda1d5c08219755743663a3790e4f5ae9e1fcb85bb3fe0d74bb7109"),
+	TxIndex:     4,
+	BlockHash:   common.HexToHash("0x6fd1980ab4af87ce371599a3ef37d4f8fba03718a1f06d127a245b068492c65d"),
+	Index:       3,
+	Removed:     false,
+}
+
+var rawFlogLog, _ = json.Marshal(EthFlogLog)
+var FlogModel = flog.FlogModel{
+	Era:              "1337",
+	LogIndex:         EthFlogLog.Index,
+	TransactionIndex: EthFlogLog.TxIndex,
+	Raw:              rawFlogLog,
+}

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

@@ -0,0 +1,34 @@
+// 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 flog
+
+import (
+	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/test_data"
+)
+
+type MockFlogConverter struct {
+	converterError error
+	PassedLogs     []types.Log
+}
+
+func (converter *MockFlogConverter) ToModels(ethLogs []types.Log) ([]interface{}, error) {
+	converter.PassedLogs = ethLogs
+	return []interface{}{test_data.FlogModel}, converter.converterError
+}
+
+func (converter *MockFlogConverter) SetConverterError(e error) {
+	converter.converterError = e
+}

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

@@ -0,0 +1,70 @@
+// 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 flog
+
+import (
+	"github.com/vulcanize/vulcanizedb/pkg/core"
+	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
+)
+
+type MockFlogRepository struct {
+	createError               error
+	missingHeaders            []core.Header
+	missingHeadersError       error
+	PassedStartingBlockNumber int64
+	PassedEndingBlockNumber   int64
+	PassedHeaderID            int64
+	PassedModels              []interface{}
+	CheckedHeaderIDs          []int64
+	CheckedHeaderError        error
+	SetDbCalled               bool
+}
+
+func (repository *MockFlogRepository) Create(headerID int64, models []interface{}) error {
+	repository.PassedHeaderID = headerID
+	repository.PassedModels = models
+	return repository.createError
+}
+
+func (repository *MockFlogRepository) MissingHeaders(startingBlockNumber, endingBlockNumber int64) ([]core.Header, error) {
+	repository.PassedStartingBlockNumber = startingBlockNumber
+	repository.PassedEndingBlockNumber = endingBlockNumber
+	return repository.missingHeaders, repository.missingHeadersError
+}
+
+func (repository *MockFlogRepository) SetMissingHeadersError(e error) {
+	repository.missingHeadersError = e
+}
+
+func (repository *MockFlogRepository) SetMissingHeaders(headers []core.Header) {
+	repository.missingHeaders = headers
+}
+
+func (repository *MockFlogRepository) SetCreateError(e error) {
+	repository.createError = e
+}
+
+func (repository *MockFlogRepository) MarkHeaderChecked(headerId int64) error {
+	repository.CheckedHeaderIDs = append(repository.CheckedHeaderIDs, headerId)
+	return repository.CheckedHeaderError
+}
+
+func (repository *MockFlogRepository) SetCheckedHeaderError(e error) {
+	repository.CheckedHeaderError = e
+}
+
+func (repository *MockFlogRepository) SetDB(db *postgres.DB) {
+	repository.SetDbCalled = true
+}

pkg/transformers/transformers.go

@@ -28,6 +28,7 @@ import (
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/drip_file/vow"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/factories"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/flip_kick"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/flog"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/flop_kick"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/frob"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/pit_file/debt_ceiling"
@@ -78,6 +79,13 @@ var (
 	}.NewTransformer
 
 	FlipKickTransformerInitializer = flip_kick.FlipKickTransformerInitializer{Config: flip_kick.FlipKickConfig}.NewFlipKickTransformer
+	FlogTransformerInitializer     = factories.Transformer{
+		Config:     flog.FlogConfig,
+		Converter:  &flog.FlogConverter{},
+		Repository: &flog.FlogRepository{},
+		Fetcher:    &shared.Fetcher{},
+	}.NewTransformer
+
 	FlopKickTransformerInitializer           = flop_kick.FlopKickTransformerInitializer{Config: flop_kick.Config}.NewFlopKickTransformer
 	FrobTransformerInitializer               = frob.FrobTransformerInitializer{Config: frob.FrobConfig}.NewFrobTransformer
 	PitFileDebtCeilingTransformerInitializer = factories.Transformer{
@@ -148,6 +156,7 @@ func TransformerInitializers() []shared.TransformerInitializer {
 		DripFileVowTransfromerInitializer,
 		DripFileRepoTransformerInitializer,
 		FlipKickTransformerInitializer,
+		FlogTransformerInitializer,
 		FlopKickTransformerInitializer,
 		FrobTransformerInitializer,
 		PitFileDebtCeilingTransformerInitializer,

test_config/test_config.go

@@ -89,6 +89,7 @@ func CleanTestDB(db *postgres.DB) {
 	db.MustExec("DELETE FROM maker.drip_file_repo")
 	db.MustExec("DELETE FROM maker.drip_file_vow")
 	db.MustExec("DELETE FROM maker.flip_kick")
+	db.MustExec("DELETE FROM maker.vow_flog")
 	db.MustExec("DELETE FROM maker.flop_kick")
 	db.MustExec("DELETE FROM maker.frob")
 	db.MustExec("DELETE FROM maker.pit_file_debt_ceiling")