Dent (#10)

Convert and persist LogNote events as dent records

db/migrations/1534799167_create_dent_table.down.sql

@@ -0,0 +1 @@
+DROP TABLE maker.dent;

db/migrations/1534799167_create_dent_table.up.sql

@@ -0,0 +1,11 @@
+CREATE TABLE maker.dent (
+  db_id            SERIAL PRIMARY KEY,
+  header_id        INTEGER NOT NULL REFERENCES headers (id) ON DELETE CASCADE,
+  bid_id           NUMERIC NOT NULL UNIQUE,
+  lot              NUMERIC,
+  bid              NUMERIC,
+  guy              BYTEA,
+  tic              NUMERIC,
+	tx_idx           INTEGER NOT NUll,
+  raw_log          JSONB
+);

db/schema.sql

@@ -79,6 +79,43 @@ CREATE SEQUENCE maker.bite_id_seq
 ALTER SEQUENCE maker.bite_id_seq OWNED BY maker.bite.id;
 
 
+--
+-- Name: dent; Type: TABLE; Schema: maker; Owner: -
+--
+
+CREATE TABLE maker.dent (
+    db_id integer NOT NULL,
+    header_id integer NOT NULL,
+    bid_id numeric NOT NULL,
+    lot numeric,
+    bid numeric,
+    guy bytea,
+    tic numeric,
+    tx_idx integer NOT NULL,
+    raw_log jsonb
+);
+
+
+--
+-- Name: dent_db_id_seq; Type: SEQUENCE; Schema: maker; Owner: -
+--
+
+CREATE SEQUENCE maker.dent_db_id_seq
+    AS integer
+    START WITH 1
+    INCREMENT BY 1
+    NO MINVALUE
+    NO MAXVALUE
+    CACHE 1;
+
+
+--
+-- Name: dent_db_id_seq; Type: SEQUENCE OWNED BY; Schema: maker; Owner: -
+--
+
+ALTER SEQUENCE maker.dent_db_id_seq OWNED BY maker.dent.db_id;
+
+
 --
 -- Name: flip_kick; Type: TABLE; Schema: maker; Owner: -
 --
@@ -709,6 +746,13 @@ CREATE VIEW public.watched_event_logs AS
 ALTER TABLE ONLY maker.bite ALTER COLUMN id SET DEFAULT nextval('maker.bite_id_seq'::regclass);
 
 
+--
+-- Name: dent db_id; Type: DEFAULT; Schema: maker; Owner: -
+--
+
+ALTER TABLE ONLY maker.dent ALTER COLUMN db_id SET DEFAULT nextval('maker.dent_db_id_seq'::regclass);
+
+
 --
 -- Name: flip_kick db_id; Type: DEFAULT; Schema: maker; Owner: -
 --
@@ -837,6 +881,22 @@ ALTER TABLE ONLY maker.bite
     ADD CONSTRAINT bite_pkey PRIMARY KEY (id);
 
 
+--
+-- Name: dent dent_bid_id_key; Type: CONSTRAINT; Schema: maker; Owner: -
+--
+
+ALTER TABLE ONLY maker.dent
+    ADD CONSTRAINT dent_bid_id_key UNIQUE (bid_id);
+
+
+--
+-- Name: dent dent_pkey; Type: CONSTRAINT; Schema: maker; Owner: -
+--
+
+ALTER TABLE ONLY maker.dent
+    ADD CONSTRAINT dent_pkey PRIMARY KEY (db_id);
+
+
 --
 -- Name: flip_kick flip_kick_id_key; Type: CONSTRAINT; Schema: maker; Owner: -
 --
@@ -1088,6 +1148,14 @@ ALTER TABLE ONLY maker.bite
     ADD CONSTRAINT bite_header_id_fkey FOREIGN KEY (header_id) REFERENCES public.headers(id) ON DELETE CASCADE;
 
 
+--
+-- Name: dent dent_header_id_fkey; Type: FK CONSTRAINT; Schema: maker; Owner: -
+--
+
+ALTER TABLE ONLY maker.dent
+    ADD CONSTRAINT dent_header_id_fkey FOREIGN KEY (header_id) REFERENCES public.headers(id) ON DELETE CASCADE;
+
+
 --
 -- Name: flip_kick flip_kick_header_id_fkey; Type: FK CONSTRAINT; Schema: maker; Owner: -
 --

pkg/transformers/bite/converter.go

@@ -22,7 +22,7 @@ import (
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/vulcanize/vulcanizedb/pkg/geth"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/utilities"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
 )
 
 type Converter interface {
@@ -70,14 +70,14 @@ func (converter BiteConverter) ToModel(entity BiteEntity) (BiteModel, error) {
 	}
 
 	return BiteModel{
-		Id:               utilities.ConvertNilToEmptyString(id),
+		Id:               shared.ConvertNilToEmptyString(id),
 		Ilk:              ilk,
 		Lad:              lad,
-		Ink:              utilities.ConvertNilToEmptyString(ink),
+		Ink:              shared.ConvertNilToEmptyString(ink),
-		Art:              utilities.ConvertNilToEmptyString(art),
+		Art:              shared.ConvertNilToEmptyString(art),
-		IArt:             utilities.ConvertNilToEmptyString(iArt),
+		IArt:             shared.ConvertNilToEmptyString(iArt),
-		Tab:              utilities.ConvertNilToEmptyString(tab),
+		Tab:              shared.ConvertNilToEmptyString(tab),
-		Flip:             utilities.ConvertNilToEmptyString(flip),
+		Flip:             shared.ConvertNilToEmptyString(flip),
 		TransactionIndex: txIdx,
 		Raw:              rawLogString,
 	}, nil

pkg/transformers/dent/config.go

@@ -0,0 +1,25 @@
+// 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 dent
+
+import "github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
+
+var DentConfig = shared.TransformerConfig{
+	ContractAddress:     shared.FlipperContractAddress,
+	ContractAbi:         shared.FlipperABI,
+	Topics:              []string{shared.DentFunctionSignature},
+	StartingBlockNumber: 0,
+	EndingBlockNumber:   100,
+}

pkg/transformers/dent/converter.go

@@ -0,0 +1,87 @@
+// 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 dent
+
+import (
+	"encoding/json"
+	"errors"
+	"math/big"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/core/types"
+)
+
+type Converter interface {
+	Convert(contractAddress string, contractAbi string, ethLog types.Log) (DentModel, error)
+}
+
+type DentConverter struct{}
+
+func NewDentConverter() DentConverter {
+	return DentConverter{}
+}
+
+func (c DentConverter) Convert(contractAddress, contractAbi string, ethLog types.Log) (DentModel, error) {
+	err := validateLog(ethLog)
+	if err != nil {
+		return DentModel{}, err
+	}
+
+	bidId := ethLog.Topics[2].Big()
+	lot := ethLog.Topics[3].Big().String()
+	bidValue := getBidValue(ethLog)
+	guy := common.HexToAddress(ethLog.Topics[1].Hex()).String()
+	tic := "0"
+	//TODO: it is likely that the tic value will need to be added to an emitted event,
+	//so this will need to be updated at that point
+
+	transactionIndex := ethLog.TxIndex
+
+	raw, err := json.Marshal(ethLog)
+	if err != nil {
+		return DentModel{}, err
+	}
+
+	return DentModel{
+		BidId:            bidId.String(),
+		Lot:              lot,
+		Bid:              bidValue,
+		Guy:              guy,
+		Tic:              tic,
+		TransactionIndex: transactionIndex,
+		Raw:              raw,
+	}, nil
+}
+
+func validateLog(ethLog types.Log) error {
+	if len(ethLog.Data) <= 0 {
+		return errors.New("dent log data is empty")
+	}
+
+	if len(ethLog.Topics) < 4 {
+		return errors.New("dent log does not contain expected topics")
+	}
+
+	return nil
+}
+
+func getBidValue(ethLog types.Log) string {
+	itemByteLength := 32
+	lastDataItemStartIndex := len(ethLog.Data) - itemByteLength
+	lastItem := ethLog.Data[lastDataItemStartIndex:]
+	lastValue := big.NewInt(0).SetBytes(lastItem)
+
+	return lastValue.String()
+}

pkg/transformers/dent/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 dent_test
+
+import (
+	"github.com/ethereum/go-ethereum/common"
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/dent"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/test_data"
+)
+
+var _ = Describe("Dent Converter", func() {
+	var converter dent.DentConverter
+
+	BeforeEach(func() {
+		converter = dent.NewDentConverter()
+	})
+
+	It("converts an eth log to a db model", func() {
+		model, err := converter.Convert(shared.FlipperContractAddress, shared.FlipperABI, test_data.DentLog)
+
+		Expect(err).NotTo(HaveOccurred())
+		Expect(model).To(Equal(test_data.DentModel))
+	})
+
+	It("returns an error if the expected amount of topics aren't in the log", func() {
+		invalidLog := test_data.DentLog
+		invalidLog.Topics = []common.Hash{}
+		model, err := converter.Convert(shared.FlipperContractAddress, shared.FlipperABI, invalidLog)
+		Expect(err).To(HaveOccurred())
+		Expect(err).To(MatchError("dent log does not contain expected topics"))
+		Expect(model).To(Equal(dent.DentModel{}))
+	})
+
+	It("returns an error if the log data is empty", func() {
+		emptyDataLog := test_data.DentLog
+		emptyDataLog.Data = []byte{}
+		model, err := converter.Convert(shared.FlipperContractAddress, shared.FlipperABI, emptyDataLog)
+		Expect(err).To(HaveOccurred())
+		Expect(err).To(MatchError("dent log data is empty"))
+		Expect(model).To(Equal(dent.DentModel{}))
+	})
+})

pkg/transformers/dent/dent_suite_test.go

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

pkg/transformers/dent/model.go

@@ -0,0 +1,25 @@
+// 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 dent
+
+type DentModel struct {
+	BidId            string `db:"bid_id"`
+	Lot              string
+	Bid              string
+	Guy              string
+	Tic              string
+	TransactionIndex uint   `db:"tx_idx"`
+	Raw              []byte `db:"raw_log"`
+}

pkg/transformers/dent/repository.go

@@ -0,0 +1,62 @@
+// 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 dent
+
+import (
+	"github.com/vulcanize/vulcanizedb/pkg/core"
+	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
+)
+
+type Repository interface {
+	Create(headerId int64, model DentModel) error
+	MissingHeaders(startingBlockNumber, endingBlockNumber int64) ([]core.Header, error)
+}
+
+type DentRepository struct {
+	db *postgres.DB
+}
+
+func NewDentRepository(database *postgres.DB) DentRepository {
+	return DentRepository{db: database}
+}
+
+func (r DentRepository) Create(headerId int64, model DentModel) error {
+	_, err := r.db.Exec(
+		`INSERT into maker.dent (header_id, bid_id, lot, bid, guy, tic, tx_idx, raw_log)
+         VALUES($1, $2, $3, $4, $5, $6, $7, $8)`,
+		headerId, model.BidId, model.Lot, model.Bid, model.Guy, model.Tic, model.TransactionIndex, model.Raw,
+	)
+
+	return err
+}
+
+func (r DentRepository) MissingHeaders(startingBlockNumber, endingBlockNumber int64) ([]core.Header, error) {
+	var missingHeaders []core.Header
+
+	err := r.db.Select(
+		&missingHeaders,
+		`SELECT headers.id, headers.block_number FROM headers
+               LEFT JOIN maker.dent on headers.id = header_id
+               WHERE header_id ISNULL
+               AND headers.block_number >= $1
+               AND headers.block_number <= $2
+               AND headers.eth_node_fingerprint = $3`,
+		startingBlockNumber,
+		endingBlockNumber,
+		r.db.Node.ID,
+	)
+
+	return missingHeaders, err
+}

pkg/transformers/dent/repository_test.go

@@ -0,0 +1,153 @@
+// 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 dent_test
+
+import (
+	"math/rand"
+
+	. "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/dent"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/test_data"
+	"github.com/vulcanize/vulcanizedb/test_config"
+)
+
+var _ = Describe("Dent Repository", func() {
+	var node core.Node
+	var db *postgres.DB
+	var dentRepository dent.DentRepository
+	var headerRepository repositories.HeaderRepository
+	var headerId int64
+	var err error
+
+	BeforeEach(func() {
+		node = test_config.NewTestNode()
+		db = test_config.NewTestDB(node)
+		test_config.CleanTestDB(db)
+		dentRepository = dent.NewDentRepository(db)
+		headerRepository = repositories.NewHeaderRepository(db)
+	})
+
+	Describe("Create", func() {
+		BeforeEach(func() {
+			headerId, err = headerRepository.CreateOrUpdateHeader(core.Header{})
+			Expect(err).NotTo(HaveOccurred())
+
+			err := dentRepository.Create(headerId, test_data.DentModel)
+			Expect(err).NotTo(HaveOccurred())
+		})
+
+		It("persists a dent record", func() {
+			var count int
+			db.QueryRow(`SELECT count(*) FROM maker.dent`).Scan(&count)
+			Expect(count).To(Equal(1))
+
+			var dbResult dent.DentModel
+			err = db.Get(&dbResult, `SELECT bid_id, lot, bid, guy, tic, tx_idx, raw_log FROM maker.dent WHERE header_id = $1`, headerId)
+			Expect(err).NotTo(HaveOccurred())
+			Expect(dbResult.BidId).To(Equal(test_data.DentModel.BidId))
+			Expect(dbResult.Lot).To(Equal(test_data.DentModel.Lot))
+			Expect(dbResult.Bid).To(Equal(test_data.DentModel.Bid))
+			Expect(dbResult.Guy).To(Equal(test_data.DentModel.Guy))
+			Expect(dbResult.Tic).To(Equal(test_data.DentModel.Tic))
+			Expect(dbResult.TransactionIndex).To(Equal(test_data.DentModel.TransactionIndex))
+			Expect(dbResult.Raw).To(MatchJSON(test_data.DentModel.Raw))
+		})
+
+		It("returns an error if inserting a dent record fails", func() {
+			err = dentRepository.Create(headerId, test_data.DentModel)
+			Expect(err).To(HaveOccurred())
+			Expect(err.Error()).To(ContainSubstring("pq: duplicate key value violates unique constraint"))
+		})
+
+		It("deletes the tend record if its corresponding header record is deleted", func() {
+			var count int
+			err = db.QueryRow(`SELECT count(*) from maker.dent`).Scan(&count)
+			Expect(err).NotTo(HaveOccurred())
+			Expect(count).To(Equal(1))
+
+			_, err = db.Exec(`DELETE FROM headers where id = $1`, headerId)
+			Expect(err).NotTo(HaveOccurred())
+
+			err = db.QueryRow(`SELECT count(*) from maker.dent`).Scan(&count)
+			Expect(err).NotTo(HaveOccurred())
+			Expect(count).To(Equal(0))
+		})
+	})
+
+	Describe("MissingHeaders", func() {
+		var dentBlockNumber int64
+		var startingBlockNumber int64
+		var endingBlockNumber int64
+		var blockNumbers []int64
+
+		BeforeEach(func() {
+			dentBlockNumber = rand.Int63()
+			startingBlockNumber = dentBlockNumber - 1
+			endingBlockNumber = dentBlockNumber + 1
+			outOfRangeBlockNumber := dentBlockNumber + 2
+
+			blockNumbers = []int64{startingBlockNumber, dentBlockNumber, endingBlockNumber, outOfRangeBlockNumber}
+
+			var headerIds []int64
+			for _, number := range blockNumbers {
+				headerId, err := headerRepository.CreateOrUpdateHeader(core.Header{BlockNumber: number})
+				Expect(err).NotTo(HaveOccurred())
+				headerIds = append(headerIds, headerId)
+			}
+
+			dentRepository.Create(headerIds[1], test_data.DentModel)
+		})
+
+		It("returns header records that don't have a corresponding dents", func() {
+			missingHeaders, err := dentRepository.MissingHeaders(startingBlockNumber, endingBlockNumber)
+
+			Expect(err).NotTo(HaveOccurred())
+			Expect(len(missingHeaders)).To(Equal(2))
+			Expect(missingHeaders[0].BlockNumber).To(Equal(startingBlockNumber))
+			Expect(missingHeaders[1].BlockNumber).To(Equal(endingBlockNumber))
+		})
+
+		It("only returns missing headers for the given node", func() {
+			node2 := core.Node{}
+			db2 := test_config.NewTestDB(node2)
+			dentRepository2 := dent.NewDentRepository(db2)
+			headerRepository2 := repositories.NewHeaderRepository(db2)
+			var node2HeaderIds []int64
+			for _, number := range blockNumbers {
+				id, err := headerRepository2.CreateOrUpdateHeader(core.Header{BlockNumber: number})
+				node2HeaderIds = append(node2HeaderIds, id)
+				Expect(err).NotTo(HaveOccurred())
+			}
+
+			missingHeadersNode1, err := dentRepository.MissingHeaders(startingBlockNumber, endingBlockNumber)
+			Expect(err).NotTo(HaveOccurred())
+			Expect(len(missingHeadersNode1)).To(Equal(2))
+			Expect(missingHeadersNode1[0].BlockNumber).To(Equal(startingBlockNumber))
+			Expect(missingHeadersNode1[1].BlockNumber).To(Equal(endingBlockNumber))
+
+			missingHeadersNode2, err := dentRepository2.MissingHeaders(startingBlockNumber, endingBlockNumber)
+			Expect(err).NotTo(HaveOccurred())
+			Expect(len(missingHeadersNode2)).To(Equal(3))
+			Expect(missingHeadersNode2[0].BlockNumber).To(Equal(startingBlockNumber))
+			Expect(missingHeadersNode2[1].BlockNumber).To(Equal(dentBlockNumber))
+			Expect(missingHeadersNode2[2].BlockNumber).To(Equal(endingBlockNumber))
+		})
+	})
+})

pkg/transformers/dent/transformer.go

@@ -0,0 +1,80 @@
+// 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 dent
+
+import (
+	"log"
+
+	"github.com/ethereum/go-ethereum/common"
+
+	"github.com/vulcanize/vulcanizedb/pkg/core"
+	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
+)
+
+type DentTransformer struct {
+	Config     shared.TransformerConfig
+	Converter  Converter
+	Fetcher    shared.LogFetcher
+	Repository Repository
+}
+
+type DentTransformerInitializer struct {
+	Config shared.TransformerConfig
+}
+
+func (i DentTransformerInitializer) NewDentTransformer(db *postgres.DB, blockChain core.BlockChain) shared.Transformer {
+	converter := NewDentConverter()
+	fetcher := shared.NewFetcher(blockChain)
+	repository := NewDentRepository(db)
+	return DentTransformer{
+		Config:     i.Config,
+		Converter:  converter,
+		Fetcher:    fetcher,
+		Repository: repository,
+	}
+}
+
+func (t DentTransformer) Execute() error {
+	config := t.Config
+	topics := [][]common.Hash{{common.HexToHash(shared.DentFunctionSignature)}}
+	headers, err := t.Repository.MissingHeaders(config.StartingBlockNumber, config.EndingBlockNumber)
+	for _, header := range headers {
+		ethLogs, err := t.Fetcher.FetchLogs(config.ContractAddress, topics, header.BlockNumber)
+
+		if err != nil {
+			log.Println("Error fetching dent logs:", err)
+			return err
+		}
+
+		for _, ethLog := range ethLogs {
+			model, err := t.Converter.Convert(config.ContractAddress, config.ContractAbi, ethLog)
+
+			if err != nil {
+				log.Println("Error converting dent log", err)
+				return err
+			}
+
+			err = t.Repository.Create(header.Id, model)
+
+			if err != nil {
+				log.Println("Error persisting dent record", err)
+				return err
+			}
+		}
+	}
+
+	return err
+}

pkg/transformers/dent/transformer_test.go

@@ -0,0 +1,131 @@
+// 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 dent_test
+
+import (
+	"math/rand"
+
+	"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/dent"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/test_data"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/test_data/mocks"
+	dent_mocks "github.com/vulcanize/vulcanizedb/pkg/transformers/test_data/mocks/dent"
+)
+
+var _ = Describe("DentTransformer", func() {
+	var config = dent.DentConfig
+	var dentRepository dent_mocks.MockDentRepository
+	var fetcher mocks.MockLogFetcher
+	var converter dent_mocks.MockDentConverter
+	var transformer dent.DentTransformer
+
+	BeforeEach(func() {
+		dentRepository = dent_mocks.MockDentRepository{}
+		fetcher = mocks.MockLogFetcher{}
+		converter = dent_mocks.MockDentConverter{}
+		transformer = dent.DentTransformer{
+			Repository: &dentRepository,
+			Config:     config,
+			Fetcher:    &fetcher,
+			Converter:  &converter,
+		}
+	})
+
+	It("gets missing headers", func() {
+		err := transformer.Execute()
+
+		Expect(err).NotTo(HaveOccurred())
+		Expect(dentRepository.PassedStartingBlockNumber).To(Equal(config.StartingBlockNumber))
+		Expect(dentRepository.PassedEndingBlockNumber).To(Equal(config.EndingBlockNumber))
+	})
+
+	It("returns an error if fetching the missing headers fails", func() {
+		dentRepository.SetMissingHeadersError(fakes.FakeError)
+		err := transformer.Execute()
+
+		Expect(err).To(HaveOccurred())
+	})
+
+	It("fetches logs for each missing header", func() {
+		header1 := core.Header{BlockNumber: rand.Int63()}
+		header2 := core.Header{BlockNumber: rand.Int63()}
+		dentRepository.SetMissingHeaders([]core.Header{header1, header2})
+		err := transformer.Execute()
+
+		Expect(err).NotTo(HaveOccurred())
+		Expect(fetcher.FetchedContractAddress).To(Equal(config.ContractAddress))
+		expectedTopics := [][]common.Hash{{common.HexToHash(shared.DentFunctionSignature)}}
+		Expect(fetcher.FetchedTopics).To(Equal(expectedTopics))
+		Expect(fetcher.FetchedBlocks).To(Equal([]int64{header1.BlockNumber, header2.BlockNumber}))
+	})
+
+	It("returns an error if fetching logs fails", func() {
+		dentRepository.SetMissingHeaders([]core.Header{{}})
+		fetcher.SetFetcherError(fakes.FakeError)
+		err := transformer.Execute()
+
+		Expect(err).To(HaveOccurred())
+		Expect(err).To(MatchError(fakes.FakeError))
+	})
+
+	It("converts each eth log to a Model", func() {
+		dentRepository.SetMissingHeaders([]core.Header{{}})
+		fetcher.SetFetchedLogs([]types.Log{test_data.DentLog})
+		err := transformer.Execute()
+
+		Expect(err).NotTo(HaveOccurred())
+		Expect(converter.PassedContractAddress).To(Equal(config.ContractAddress))
+		Expect(converter.PassedContractAbi).To(Equal(config.ContractAbi))
+		Expect(converter.LogsToConvert).To(Equal([]types.Log{test_data.DentLog}))
+	})
+
+	It("returns an error if converting the eth log fails", func() {
+		dentRepository.SetMissingHeaders([]core.Header{{}})
+		fetcher.SetFetchedLogs([]types.Log{test_data.DentLog})
+		converter.SetConverterError(fakes.FakeError)
+		err := transformer.Execute()
+
+		Expect(err).To(HaveOccurred())
+		Expect(err).To(MatchError(fakes.FakeError))
+	})
+
+	It("persists each model as a Dent record", func() {
+		header1 := core.Header{Id: rand.Int63()}
+		header2 := core.Header{Id: rand.Int63()}
+		dentRepository.SetMissingHeaders([]core.Header{header1, header2})
+		fetcher.SetFetchedLogs([]types.Log{test_data.DentLog})
+		err := transformer.Execute()
+
+		Expect(err).NotTo(HaveOccurred())
+		Expect(dentRepository.PassedDentModels).To(Equal([]dent.DentModel{test_data.DentModel, test_data.DentModel}))
+		Expect(dentRepository.PassedHeaderIds).To(Equal([]int64{header1.Id, header2.Id}))
+	})
+
+	It("returns an error if persisting dent record fails", func() {
+		dentRepository.SetMissingHeaders([]core.Header{{}})
+		dentRepository.SetCreateError(fakes.FakeError)
+		fetcher.SetFetchedLogs([]types.Log{test_data.DentLog})
+		err := transformer.Execute()
+
+		Expect(err).To(HaveOccurred())
+	})
+})

pkg/transformers/flip_kick/converter.go

@@ -24,7 +24,7 @@ import (
 	"github.com/ethereum/go-ethereum/core/types"
 
 	"github.com/vulcanize/vulcanizedb/pkg/geth"
-	"github.com/vulcanize/vulcanizedb/pkg/transformers/utilities"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
 )
 
 type Converter interface {
@@ -58,13 +58,13 @@ func (FlipKickConverter) ToModel(flipKick FlipKickEntity) (FlipKickModel, error)
 	}
 
 	id := flipKick.Id.String()
-	lot := utilities.ConvertNilToEmptyString(flipKick.Lot.String())
+	lot := shared.ConvertNilToEmptyString(flipKick.Lot.String())
-	bid := utilities.ConvertNilToEmptyString(flipKick.Bid.String())
+	bid := shared.ConvertNilToEmptyString(flipKick.Bid.String())
 	gal := flipKick.Gal.String()
-	endValue := utilities.ConvertNilToZeroTimeValue(flipKick.End)
+	endValue := shared.ConvertNilToZeroTimeValue(flipKick.End)
 	end := time.Unix(endValue, 0)
 	urn := common.BytesToAddress(flipKick.Urn[:common.AddressLength]).String()
-	tab := utilities.ConvertNilToEmptyString(flipKick.Tab.String())
+	tab := shared.ConvertNilToEmptyString(flipKick.Tab.String())
 	rawLogJson, err := json.Marshal(flipKick.Raw)
 	if err != nil {
 		return FlipKickModel{}, err

pkg/transformers/shared/bid.go

@@ -0,0 +1,31 @@
+// 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 shared
+
+import (
+	"github.com/ethereum/go-ethereum/common"
+	"math/big"
+)
+
+type Bid struct {
+	Bid *big.Int
+	Lot *big.Int
+	Guy common.Address
+	Tic *big.Int
+	End *big.Int
+	Lad [32]byte
+	Gal common.Address
+	Tab *big.Int
+}

pkg/transformers/shared/bid_fetcher.go

@@ -0,0 +1,45 @@
+// 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 shared
+
+import (
+	"github.com/vulcanize/vulcanizedb/pkg/core"
+)
+
+type IBidFetcher interface {
+	FetchBid(contractAbi, contractAddress string, blockNumber int64, methodArgs interface{}) (Bid, error)
+}
+
+type BidFetcher struct {
+	blockChain core.BlockChain
+}
+
+func NewBidFetcher(blockchain core.BlockChain) IBidFetcher {
+	return BidFetcher{
+		blockChain: blockchain,
+	}
+}
+
+func (fetcher BidFetcher) FetchBid(contractAbi, contractAddress string, blockNumber int64, methodArgs interface{}) (Bid, error) {
+	method := "bids"
+	result := Bid{}
+	err := fetcher.blockChain.FetchContractData(contractAbi, contractAddress, method, methodArgs, &result, blockNumber)
+
+	if err != nil {
+		return result, err
+	}
+
+	return result, nil
+}

pkg/transformers/shared/bid_fetcher_test.go

@@ -0,0 +1,57 @@
+// 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 shared_test
+
+import (
+	"math/big"
+
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+
+	"github.com/vulcanize/vulcanizedb/pkg/fakes"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
+)
+
+var _ = Describe("Dent Bid BidFetcher", func() {
+	var blockChain *fakes.MockBlockChain
+	var fetcher shared.IBidFetcher
+	var blockNumber = int64(123)
+	var address = "0xfakeAddress"
+	var contractAbi = "contractAbi"
+
+	BeforeEach(func() {
+		blockChain = fakes.NewMockBlockChain()
+		fetcher = shared.NewBidFetcher(blockChain)
+	})
+
+	It("fetches a bid record for the given id", func() {
+		method := "bids"
+		bidId := big.NewInt(1)
+		result := &shared.Bid{}
+		_, err := fetcher.FetchBid(contractAbi, address, blockNumber, bidId)
+
+		Expect(err).NotTo(HaveOccurred())
+		blockChain.AssertFetchContractDataCalledWith(contractAbi, address, method, bidId, result, blockNumber)
+	})
+
+	It("returns an error if fetching the bid fails", func() {
+		blockChain.SetFetchContractDataErr(fakes.FakeError)
+		fetcher := shared.NewBidFetcher(blockChain)
+		_, err := fetcher.FetchBid(contractAbi, address, blockNumber, nil)
+
+		Expect(err).To(HaveOccurred())
+		Expect(err).To(MatchError(fakes.FakeError))
+	})
+})

pkg/transformers/shared/constants.go

@@ -16,6 +16,7 @@ package shared
 
 var (
 	biteMethod                = "Bite(bytes32,bytes32,uint256,uint256,uint256,uint256,uint256)"
+	dentMethod                = "dent(uint256,uint256,uint256)"
 	flipKickMethod            = "Kick(uint256,uint256,uint256,address,uint48,bytes32,uint256)"
 	frobMethod                = "Frob(bytes32,bytes32,uint256,uint256,int256,int256,uint256)"
 	pitFileDebtCeilingMethod  = "file(bytes32,uint256)"
@@ -31,6 +32,7 @@ var (
 	FlipperContractAddress = "0x6b59c42097e2fff7cad96cb08ceefd601081ad9c" //this is a temporary address deployed locally
 
 	BiteSignature                = GetEventSignature(biteMethod)
+	DentFunctionSignature        = GetLogNoteSignature(dentMethod)
 	FlipKickSignature            = GetEventSignature(flipKickMethod)
 	FrobSignature                = GetEventSignature(frobMethod)
 	LogValueSignature            = GetEventSignature("")

pkg/transformers/shared/utilities.go

@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package utilities
+package shared
 
 import "math/big"
 

pkg/transformers/tend/converter.go

@@ -16,37 +16,71 @@ package tend
 
 import (
 	"encoding/json"
+	"errors"
 	"math/big"
 
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core/types"
+
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
 )
 
 type Converter interface {
 	Convert(contractAddress string, contractAbi string, ethLog types.Log) (TendModel, error)
 }
 
-type TendConverter struct{}
+type TendConverter struct {
+	BidFetcher shared.IBidFetcher
+}
+
+func NewTendConverter() TendConverter {
+	return TendConverter{}
+}
 
 func (c TendConverter) Convert(contractAddress string, contractAbi string, ethLog types.Log) (TendModel, error) {
-	entity := TendModel{}
+	err := validateLog(ethLog)
-	entity.Guy = common.HexToAddress(ethLog.Topics[1].Hex()).String()
-	entity.BidId = ethLog.Topics[2].Big().String()
-	entity.Lot = ethLog.Topics[3].Big().String()
-
-	itemByteLength := 32
-	lastDataItemStartIndex := len(ethLog.Data) - itemByteLength
-	lastItem := ethLog.Data[lastDataItemStartIndex:]
-	last := big.NewInt(0).SetBytes(lastItem)
-	entity.Bid = last.String()
-
-	entity.Tic = "0" //TODO: how do we get the bid tic?
-	entity.TransactionIndex = ethLog.TxIndex
-	rawJson, err := json.Marshal(ethLog)
 	if err != nil {
 		return TendModel{}, err
 	}
 
-	entity.Raw = string(rawJson)
+	bidId := ethLog.Topics[2].Big()
-	return entity, err
+	guy := common.HexToAddress(ethLog.Topics[1].Hex()).String()
+	lot := ethLog.Topics[3].Big().String()
+
+	lastDataItemStartIndex := len(ethLog.Data) - 32
+	lastItem := ethLog.Data[lastDataItemStartIndex:]
+	last := big.NewInt(0).SetBytes(lastItem)
+	bidValue := last.String()
+	tic := "0"
+	//TODO: it is likely that the tic value will need to be added to an emitted event,
+	//so this will need to be updated at that point
+	transactionIndex := ethLog.TxIndex
+
+	rawJson, err := json.Marshal(ethLog)
+	if err != nil {
+		return TendModel{}, err
+	}
+	raw := string(rawJson)
+
+	return TendModel{
+		BidId:            bidId.String(),
+		Lot:              lot,
+		Bid:              bidValue,
+		Guy:              guy,
+		Tic:              tic,
+		TransactionIndex: transactionIndex,
+		Raw:              raw,
+	}, nil
+}
+
+func validateLog(ethLog types.Log) error {
+	if len(ethLog.Data) <= 0 {
+		return errors.New("tend log note data is empty")
+	}
+
+	if len(ethLog.Topics) < 4 {
+		return errors.New("tend log does not contain expected topics")
+	}
+
+	return nil
 }

pkg/transformers/tend/converter_test.go

@@ -18,6 +18,7 @@ import (
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
 
+	"github.com/ethereum/go-ethereum/common"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/tend"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/test_data"
@@ -27,14 +28,34 @@ var _ = Describe("Tend TendConverter", func() {
 	var converter tend.TendConverter
 
 	BeforeEach(func() {
-		converter = tend.TendConverter{}
+		converter = tend.NewTendConverter()
 	})
 
 	Describe("Convert", func() {
 		It("converts an eth log to a db model", func() {
 			model, err := converter.Convert(shared.FlipperContractAddress, shared.FlipperABI, test_data.TendLogNote)
+
 			Expect(err).NotTo(HaveOccurred())
 			Expect(model).To(Equal(test_data.TendModel))
 		})
+
+		It("returns an error if the log data is empty", func() {
+			emptyDataLog := test_data.TendLogNote
+			emptyDataLog.Data = []byte{}
+			model, err := converter.Convert(shared.FlipperContractAddress, shared.FlipperABI, emptyDataLog)
+
+			Expect(err).To(HaveOccurred())
+			Expect(err).To(MatchError("tend log note data is empty"))
+			Expect(model).To(Equal(tend.TendModel{}))
+		})
+
+		It("returns an error if the expected amount of topics aren't in the log", func() {
+			invalidLog := test_data.TendLogNote
+			invalidLog.Topics = []common.Hash{}
+			model, err := converter.Convert(shared.FlipperContractAddress, shared.FlipperABI, invalidLog)
+
+			Expect(err).To(MatchError("tend log does not contain expected topics"))
+			Expect(model).To(Equal(tend.TendModel{}))
+		})
 	})
 })

pkg/transformers/tend/transformer.go

@@ -36,16 +36,15 @@ type TendTransformerInitializer struct {
 }
 
 func (i TendTransformerInitializer) NewTendTransformer(db *postgres.DB, blockChain core.BlockChain) shared.Transformer {
+	converter := NewTendConverter()
 	fetcher := shared.NewFetcher(blockChain)
 	repository := NewTendRepository(db)
-	transformer := TendTransformer{
+	return TendTransformer{
 		Fetcher:    fetcher,
 		Repository: repository,
-		Converter:  TendConverter{},
+		Converter:  converter,
 		Config:     i.Config,
 	}
-
-	return transformer
 }
 
 func (t TendTransformer) Execute() error {

pkg/transformers/test_data/dent.go

@@ -0,0 +1,64 @@
+// 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/dent"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
+	"strconv"
+)
+
+var (
+	DentData            = "0x0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000645ff3a382000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000098a7d9b8314c000000000000000000000000000000000000000000000000000029a2241af62c0000"
+	DentTransactionHash = "0x5a210319fcd31eea5959fedb4a1b20881c21a21976e23ff19dff3b44cc1c71e8"
+	DentBlockHash       = "0x105b771e04d7b8516f9291b1f006c46c09cfbff9efa8bc52498b171ff99d28b5"
+	dentBidId           = int64(1)
+	dentLot             = "11000000000000000000"
+	dentBid             = "3000000000000000000"
+	DentTic             = "0"
+	dentGuy             = "0x64d922894153BE9EEf7b7218dc565d1D0Ce2a092"
+	dentRawJson, _      = json.Marshal(DentLog)
+)
+
+var DentLog = types.Log{
+	Address: common.StringToAddress(shared.FlipperContractAddress),
+	Topics: []common.Hash{
+		common.HexToHash("0x5ff3a38200000000000000000000000000000000000000000000000000000000"),
+		common.HexToHash("0x00000000000000000000000064d922894153be9eef7b7218dc565d1d0ce2a092"),
+		common.HexToHash("0x0000000000000000000000000000000000000000000000000000000000000001"),
+		common.HexToHash("0x00000000000000000000000000000000000000000000000098a7d9b8314c0000"),
+	},
+	Data:        hexutil.MustDecode(DentData),
+	BlockNumber: 15,
+	TxHash:      common.HexToHash(DentTransactionHash),
+	TxIndex:     5,
+	BlockHash:   common.HexToHash(DentBlockHash),
+	Index:       2,
+	Removed:     false,
+}
+
+var DentModel = dent.DentModel{
+	BidId:            strconv.FormatInt(dentBidId, 10),
+	Lot:              dentLot,
+	Bid:              dentBid,
+	Guy:              dentGuy,
+	Tic:              DentTic,
+	TransactionIndex: DentLog.TxIndex,
+	Raw:              dentRawJson,
+}

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

@@ -0,0 +1,40 @@
+// 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 dent
+
+import (
+	"github.com/ethereum/go-ethereum/core/types"
+
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/dent"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/test_data"
+)
+
+type MockDentConverter struct {
+	converterError        error
+	PassedContractAddress string
+	PassedContractAbi     string
+	LogsToConvert         []types.Log
+}
+
+func (c *MockDentConverter) Convert(contractAddress string, contractAbi string, ethLog types.Log) (dent.DentModel, error) {
+	c.PassedContractAddress = contractAddress
+	c.PassedContractAbi = contractAbi
+	c.LogsToConvert = append(c.LogsToConvert, ethLog)
+	return test_data.DentModel, c.converterError
+}
+
+func (c *MockDentConverter) SetConverterError(err error) {
+	c.converterError = err
+}

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

@@ -0,0 +1,56 @@
+// 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 dent
+
+import (
+	"github.com/vulcanize/vulcanizedb/pkg/core"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/dent"
+)
+
+type MockDentRepository struct {
+	PassedStartingBlockNumber int64
+	PassedEndingBlockNumber   int64
+	PassedDentModels          []dent.DentModel
+	PassedHeaderIds           []int64
+	missingHeaders            []core.Header
+	missingHeadersError       error
+	createError               error
+}
+
+func (r *MockDentRepository) Create(headerId int64, model dent.DentModel) error {
+	r.PassedHeaderIds = append(r.PassedHeaderIds, headerId)
+	r.PassedDentModels = append(r.PassedDentModels, model)
+
+	return r.createError
+}
+
+func (r *MockDentRepository) MissingHeaders(startingBlockNumber, endingBlockNumber int64) ([]core.Header, error) {
+	r.PassedStartingBlockNumber = startingBlockNumber
+	r.PassedEndingBlockNumber = endingBlockNumber
+
+	return r.missingHeaders, r.missingHeadersError
+}
+
+func (r *MockDentRepository) SetMissingHeadersError(err error) {
+	r.missingHeadersError = err
+}
+
+func (r *MockDentRepository) SetMissingHeaders(headers []core.Header) {
+	r.missingHeaders = headers
+}
+
+func (r *MockDentRepository) SetCreateError(err error) {
+	r.createError = err
+}

pkg/transformers/test_data/tend.go

@@ -16,7 +16,6 @@ package test_data
 
 import (
 	"encoding/json"
-	"math/big"
 	"strconv"
 
 	"github.com/ethereum/go-ethereum/common"
@@ -28,14 +27,14 @@ import (
 )
 
 var (
-	tendId              = int64(10)
+	tendBidId           = int64(10)
 	tendLot             = "85000000000000000000"
 	tendBid             = "1000000000000000000"
 	tendGuy             = "0x7d7bEe5fCfD8028cf7b00876C5b1421c800561A6"
-	tic                 = new(big.Int).SetBytes([]byte{0})
 	tendData            = "0x0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000644b43ed12000000000000000000000000000000000000000000000000000000000000000a0000000000000000000000000000000000000000000000049b9ca9a6943400000000000000000000000000000000000000000000000000000de0b6b3a7640000"
 	tendTransactionHash = "0x7909c8793ded2b8348f5db623044fbc26bb7ab78ad5792897abdf68ddc1df63d"
 	tendBlockHash       = "0xa8ea87147c0a68daeb6b1d9f8c0937ba975a650809cab80d19c969e8d0df452c"
+	TendTic             = "0"
 )
 
 var TendLogNote = types.Log{
@@ -57,11 +56,11 @@ var TendLogNote = types.Log{
 var RawLogNoteJson, _ = json.Marshal(TendLogNote)
 
 var TendModel = tend.TendModel{
-	BidId:            strconv.FormatInt(tendId, 10),
+	BidId:            strconv.FormatInt(tendBidId, 10),
 	Lot:              tendLot,
 	Bid:              tendBid,
 	Guy:              tendGuy,
-	Tic:              tic.String(),
+	Tic:              TendTic,
 	TransactionIndex: TendLogNote.TxIndex,
 	Raw:              string(RawLogNoteJson),
 }

pkg/transformers/transformers.go

@@ -16,6 +16,7 @@ package transformers
 
 import (
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/bite"
+	"github.com/vulcanize/vulcanizedb/pkg/transformers/dent"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/flip_kick"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/frob"
 	"github.com/vulcanize/vulcanizedb/pkg/transformers/pit_file"
@@ -28,22 +29,20 @@ import (
 )
 
 func TransformerInitializers() []shared.TransformerInitializer {
-	flipKickConfig := flip_kick.FlipKickConfig
+	biteTransformerInitializer := bite.BiteTransformerInitializer{Config: bite.BiteConfig}
-	flipKickTransformerInitializer := flip_kick.FlipKickTransformerInitializer{Config: flipKickConfig}
+	dentTransformerInitializer := dent.DentTransformerInitializer{Config: dent.DentConfig}
-	frobConfig := frob.FrobConfig
+	flipKickTransformerInitializer := flip_kick.FlipKickTransformerInitializer{Config: flip_kick.FlipKickConfig}
-	frobTransformerInitializer := frob.FrobTransformerInitializer{Config: frobConfig}
+	frobTransformerInitializer := frob.FrobTransformerInitializer{Config: frob.FrobConfig}
 	pitFileConfig := pit_file.PitFileConfig
 	pitFileDebtCeilingTransformerInitializer := debt_ceiling.PitFileDebtCeilingTransformerInitializer{Config: pitFileConfig}
 	pitFileIlkTransformerInitializer := ilk.PitFileIlkTransformerInitializer{Config: pitFileConfig}
 	pitFileStabilityFeeTransformerInitializer := stability_fee.PitFileStabilityFeeTransformerInitializer{Config: pitFileConfig}
-	priceFeedConfig := price_feeds.PriceFeedConfig
+	priceFeedTransformerInitializer := price_feeds.PriceFeedTransformerInitializer{Config: price_feeds.PriceFeedConfig}
-	priceFeedTransformerInitializer := price_feeds.PriceFeedTransformerInitializer{Config: priceFeedConfig}
+	tendTransformerInitializer := tend.TendTransformerInitializer{Config: tend.TendConfig}
-	tendConfig := tend.TendConfig
-	tendTransformerInitializer := tend.TendTransformerInitializer{Config: tendConfig}
-	biteTransformerInitializer := bite.BiteTransformerInitializer{Config: bite.BiteConfig}
 
 	return []shared.TransformerInitializer{
 		biteTransformerInitializer.NewBiteTransformer,
+		dentTransformerInitializer.NewDentTransformer,
 		flipKickTransformerInitializer.NewFlipKickTransformer,
 		frobTransformerInitializer.NewFrobTransformer,
 		pitFileDebtCeilingTransformerInitializer.NewPitFileDebtCeilingTransformer,