Merge pull request #150 from vulcanize/unique-headers-constraint-v2

Add constraint to prevent duplicate headers

cmd/coldImport.go

@@ -23,10 +23,10 @@ import (
 	"github.com/vulcanize/vulcanizedb/pkg/crypto"
 	"github.com/vulcanize/vulcanizedb/pkg/datastore/ethereum"
 	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres/repositories"
+	"github.com/vulcanize/vulcanizedb/pkg/eth/cold_import"
+	"github.com/vulcanize/vulcanizedb/pkg/eth/converters/cold_db"
+	vulcCommon "github.com/vulcanize/vulcanizedb/pkg/eth/converters/common"
 	"github.com/vulcanize/vulcanizedb/pkg/fs"
-	"github.com/vulcanize/vulcanizedb/pkg/geth/cold_import"
-	"github.com/vulcanize/vulcanizedb/pkg/geth/converters/cold_db"
-	vulcCommon "github.com/vulcanize/vulcanizedb/pkg/geth/converters/common"
 	"github.com/vulcanize/vulcanizedb/utils"
 )
 

cmd/headerSync.go

@@ -25,7 +25,7 @@ import (
 	"github.com/vulcanize/vulcanizedb/pkg/core"
 	"github.com/vulcanize/vulcanizedb/pkg/datastore"
 	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres/repositories"
-	"github.com/vulcanize/vulcanizedb/pkg/geth"
+	"github.com/vulcanize/vulcanizedb/pkg/eth"
 	"github.com/vulcanize/vulcanizedb/pkg/history"
 	"github.com/vulcanize/vulcanizedb/utils"
 )
@@ -100,7 +100,7 @@ func headerSync() {
 	}
 }
 
-func validateArgs(blockChain *geth.BlockChain) {
+func validateArgs(blockChain *eth.BlockChain) {
 	lastBlock, err := blockChain.LastBlock()
 	if err != nil {
 		LogWithCommand.Error("validateArgs: Error getting last block: ", err)

cmd/root.go

@@ -28,10 +28,10 @@ import (
 	"github.com/spf13/viper"
 
 	"github.com/vulcanize/vulcanizedb/pkg/config"
-	"github.com/vulcanize/vulcanizedb/pkg/geth"
-	"github.com/vulcanize/vulcanizedb/pkg/geth/client"
-	vRpc "github.com/vulcanize/vulcanizedb/pkg/geth/converters/rpc"
-	"github.com/vulcanize/vulcanizedb/pkg/geth/node"
+	"github.com/vulcanize/vulcanizedb/pkg/eth"
+	"github.com/vulcanize/vulcanizedb/pkg/eth/client"
+	vRpc "github.com/vulcanize/vulcanizedb/pkg/eth/converters/rpc"
+	"github.com/vulcanize/vulcanizedb/pkg/eth/node"
 )
 
 var (
@@ -155,12 +155,12 @@ func initConfig() {
 	}
 }
 
-func getBlockChain() *geth.BlockChain {
+func getBlockChain() *eth.BlockChain {
 	rpcClient, ethClient := getClients()
 	vdbEthClient := client.NewEthClient(ethClient)
 	vdbNode := node.MakeNode(rpcClient)
 	transactionConverter := vRpc.NewRpcTransactionConverter(ethClient)
-	return geth.NewBlockChain(vdbEthClient, rpcClient, vdbNode, transactionConverter)
+	return eth.NewBlockChain(vdbEthClient, rpcClient, vdbNode, transactionConverter)
 }
 
 func getClients() (client.RpcClient, *ethclient.Client) {

db/migrations/00023_create_headers_table.sql

@@ -8,7 +8,8 @@ CREATE TABLE public.headers
     block_timestamp      NUMERIC,
     check_count          INTEGER NOT NULL DEFAULT 0,
     eth_node_id          INTEGER NOT NULL REFERENCES eth_nodes (id) ON DELETE CASCADE,
-    eth_node_fingerprint VARCHAR(128)
+    eth_node_fingerprint VARCHAR(128),
+    UNIQUE (block_number, hash, eth_node_fingerprint)
 );
 
 -- Index is removed when table is

db/schema.sql

@@ -921,6 +921,14 @@ ALTER TABLE ONLY public.header_sync_transactions
     ADD CONSTRAINT header_sync_transactions_pkey PRIMARY KEY (id);
 
 
+--
+-- Name: headers headers_block_number_hash_eth_node_fingerprint_key; Type: CONSTRAINT; Schema: public; Owner: -
+--
+
+ALTER TABLE ONLY public.headers
+    ADD CONSTRAINT headers_block_number_hash_eth_node_fingerprint_key UNIQUE (block_number, hash, eth_node_fingerprint);
+
+
 --
 -- Name: headers headers_pkey; Type: CONSTRAINT; Schema: public; Owner: -
 --

go.mod

@@ -49,7 +49,7 @@ require (
 	golang.org/x/sync v0.0.0-20190423024810-112230192c58
 	gopkg.in/olebedev/go-duktape.v3 v3.0.0-20190709231704-1e4459ed25ff // indirect
 	gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7
-	gopkg.in/urfave/cli.v1 v1.0.0-00010101000000-000000000000 // indirect
+	gopkg.in/urfave/cli.v1 v1.20.0 // indirect
 )
 
 replace github.com/ethereum/go-ethereum => github.com/vulcanize/go-ethereum v0.0.0-20190731183759-8e20673bd101

integration_test/block_rewards_test.go

@@ -22,10 +22,10 @@ import (
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
 
-	"github.com/vulcanize/vulcanizedb/pkg/geth"
-	"github.com/vulcanize/vulcanizedb/pkg/geth/client"
-	vRpc "github.com/vulcanize/vulcanizedb/pkg/geth/converters/rpc"
-	"github.com/vulcanize/vulcanizedb/pkg/geth/node"
+	"github.com/vulcanize/vulcanizedb/pkg/eth"
+	"github.com/vulcanize/vulcanizedb/pkg/eth/client"
+	vRpc "github.com/vulcanize/vulcanizedb/pkg/eth/converters/rpc"
+	"github.com/vulcanize/vulcanizedb/pkg/eth/node"
 	"github.com/vulcanize/vulcanizedb/test_config"
 )
 
@@ -39,7 +39,7 @@ var _ = Describe("Rewards calculations", func() {
 		blockChainClient := client.NewEthClient(ethClient)
 		node := node.MakeNode(rpcClient)
 		transactionConverter := vRpc.NewRpcTransactionConverter(ethClient)
-		blockChain := geth.NewBlockChain(blockChainClient, rpcClient, node, transactionConverter)
+		blockChain := eth.NewBlockChain(blockChainClient, rpcClient, node, transactionConverter)
 		block, err := blockChain.GetBlockByNumber(1071819)
 		Expect(err).ToNot(HaveOccurred())
 		Expect(block.Reward).To(Equal("5313550000000000000"))
@@ -53,7 +53,7 @@ var _ = Describe("Rewards calculations", func() {
 		blockChainClient := client.NewEthClient(ethClient)
 		node := node.MakeNode(rpcClient)
 		transactionConverter := vRpc.NewRpcTransactionConverter(ethClient)
-		blockChain := geth.NewBlockChain(blockChainClient, rpcClient, node, transactionConverter)
+		blockChain := eth.NewBlockChain(blockChainClient, rpcClient, node, transactionConverter)
 		block, err := blockChain.GetBlockByNumber(1071819)
 		Expect(err).ToNot(HaveOccurred())
 		Expect(block.UnclesReward).To(Equal("6875000000000000000"))

integration_test/contract_test.go

@@ -26,11 +26,11 @@ import (
 	. "github.com/onsi/gomega"
 
 	"github.com/vulcanize/vulcanizedb/pkg/core"
-	"github.com/vulcanize/vulcanizedb/pkg/geth"
-	"github.com/vulcanize/vulcanizedb/pkg/geth/client"
-	rpc2 "github.com/vulcanize/vulcanizedb/pkg/geth/converters/rpc"
-	"github.com/vulcanize/vulcanizedb/pkg/geth/node"
-	"github.com/vulcanize/vulcanizedb/pkg/geth/testing"
+	"github.com/vulcanize/vulcanizedb/pkg/eth"
+	"github.com/vulcanize/vulcanizedb/pkg/eth/client"
+	rpc2 "github.com/vulcanize/vulcanizedb/pkg/eth/converters/rpc"
+	"github.com/vulcanize/vulcanizedb/pkg/eth/node"
+	"github.com/vulcanize/vulcanizedb/pkg/eth/testing"
 	"github.com/vulcanize/vulcanizedb/test_config"
 )
 
@@ -56,7 +56,7 @@ var _ = Describe("Reading contracts", func() {
 			blockChainClient := client.NewEthClient(ethClient)
 			node := node.MakeNode(rpcClient)
 			transactionConverter := rpc2.NewRpcTransactionConverter(ethClient)
-			blockChain := geth.NewBlockChain(blockChainClient, rpcClient, node, transactionConverter)
+			blockChain := eth.NewBlockChain(blockChainClient, rpcClient, node, transactionConverter)
 			contract := testing.SampleContract()
 
 			logs, err := blockChain.GetFullSyncLogs(contract, big.NewInt(4703824), nil)
@@ -74,7 +74,7 @@ var _ = Describe("Reading contracts", func() {
 			blockChainClient := client.NewEthClient(ethClient)
 			node := node.MakeNode(rpcClient)
 			transactionConverter := rpc2.NewRpcTransactionConverter(ethClient)
-			blockChain := geth.NewBlockChain(blockChainClient, rpcClient, node, transactionConverter)
+			blockChain := eth.NewBlockChain(blockChainClient, rpcClient, node, transactionConverter)
 
 			logs, err := blockChain.GetFullSyncLogs(core.Contract{Hash: "0x123"}, big.NewInt(4703824), nil)
 
@@ -92,7 +92,7 @@ var _ = Describe("Reading contracts", func() {
 			blockChainClient := client.NewEthClient(ethClient)
 			node := node.MakeNode(rpcClient)
 			transactionConverter := rpc2.NewRpcTransactionConverter(ethClient)
-			blockChain := geth.NewBlockChain(blockChainClient, rpcClient, node, transactionConverter)
+			blockChain := eth.NewBlockChain(blockChainClient, rpcClient, node, transactionConverter)
 
 			contract := testing.SampleContract()
 			var balance = new(big.Int)

integration_test/contract_watcher_full_transformer_test.go

@@ -18,7 +18,6 @@ package integration
 
 import (
 	"fmt"
-	"github.com/vulcanize/vulcanizedb/pkg/config"
 	"math/rand"
 	"strings"
 	"time"
@@ -27,6 +26,7 @@ import (
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
 
+	"github.com/vulcanize/vulcanizedb/pkg/config"
 	"github.com/vulcanize/vulcanizedb/pkg/contract_watcher/full/transformer"
 	"github.com/vulcanize/vulcanizedb/pkg/contract_watcher/shared/constants"
 	"github.com/vulcanize/vulcanizedb/pkg/contract_watcher/shared/helpers/test_helpers"

integration_test/contract_watcher_header_sync_transformer_test.go

@@ -40,8 +40,8 @@ var _ = Describe("contractWatcher headerSync transformer", func() {
 	var blockChain core.BlockChain
 	var headerRepository repositories.HeaderRepository
 	var headerID int64
-	var ensAddr = strings.ToLower(constants.EnsContractAddress)
-	var tusdAddr = strings.ToLower(constants.TusdContractAddress)
+	var ensAddr = strings.ToLower(constants.EnsContractAddress)   // 0x314159265dd8dbb310642f98f50c066173c1259b
+	var tusdAddr = strings.ToLower(constants.TusdContractAddress) // 0x8dd5fbce2f6a956c3022ba3663759011dd51e73e
 
 	BeforeEach(func() {
 		db, blockChain = test_helpers.SetupDBandBC()
@@ -78,11 +78,10 @@ var _ = Describe("contractWatcher headerSync transformer", func() {
 			Expect(c.Address).To(Equal(tusdAddr))
 		})
 
-		It("Fails to initialize if first and block cannot be fetched from vDB headers table", func() {
+		It("initializes when no headers available in db", func() {
 			t := transformer.NewTransformer(test_helpers.TusdConfig, blockChain, db)
 			err = t.Init()
-			Expect(err).To(HaveOccurred())
-			Expect(err.Error()).To(ContainSubstring("no rows in result set"))
+			Expect(err).ToNot(HaveOccurred())
 		})
 
 		It("Does nothing if nothing if no addresses are configured", func() {
@@ -378,6 +377,42 @@ var _ = Describe("contractWatcher headerSync transformer", func() {
 			Expect(transferLog.Value).To(Equal("2800000000000000000000"))
 		})
 
+		It("Marks header checked for a contract that has no logs at that header", func() {
+			t := transformer.NewTransformer(test_helpers.ENSandTusdConfig, blockChain, db)
+			err = t.Init()
+			Expect(err).ToNot(HaveOccurred())
+			err = t.Execute()
+			Expect(err).ToNot(HaveOccurred())
+			Expect(t.Start).To(Equal(int64(6885702)))
+
+			newOwnerLog := test_helpers.HeaderSyncNewOwnerLog{}
+			err = db.QueryRowx(fmt.Sprintf("SELECT * FROM header_%s.newowner_event", ensAddr)).StructScan(&newOwnerLog)
+			Expect(err).ToNot(HaveOccurred())
+			transferLog := test_helpers.HeaderSyncTransferLog{}
+			err = db.QueryRowx(fmt.Sprintf("SELECT * FROM header_%s.transfer_event", tusdAddr)).StructScan(&transferLog)
+			Expect(err).ToNot(HaveOccurred())
+			Expect(transferLog.HeaderID).ToNot(Equal(newOwnerLog.HeaderID))
+
+			type checkedHeader struct {
+				ID       int64 `db:"id"`
+				HeaderID int64 `db:"header_id"`
+				NewOwner int64 `db:"newowner_0x314159265dd8dbb310642f98f50c066173c1259b"`
+				Transfer int64 `db:"transfer_0x8dd5fbce2f6a956c3022ba3663759011dd51e73e"`
+			}
+
+			transferCheckedHeader := new(checkedHeader)
+			err = db.QueryRowx("SELECT * FROM public.checked_headers WHERE header_id = $1", transferLog.HeaderID).StructScan(transferCheckedHeader)
+			Expect(err).ToNot(HaveOccurred())
+			Expect(transferCheckedHeader.Transfer).To(Equal(int64(1)))
+			Expect(transferCheckedHeader.NewOwner).To(Equal(int64(1)))
+
+			newOwnerCheckedHeader := new(checkedHeader)
+			err = db.QueryRowx("SELECT * FROM public.checked_headers WHERE header_id = $1", newOwnerLog.HeaderID).StructScan(newOwnerCheckedHeader)
+			Expect(err).ToNot(HaveOccurred())
+			Expect(newOwnerCheckedHeader.NewOwner).To(Equal(int64(1)))
+			Expect(newOwnerCheckedHeader.Transfer).To(Equal(int64(1)))
+		})
+
 		It("Keeps track of contract-related hashes and addresses while transforming event data if they need to be used for later method polling", func() {
 			var testConf config.ContractConfig
 			testConf = test_helpers.ENSandTusdConfig

integration_test/geth_blockchain_test.go

@@ -24,17 +24,17 @@ import (
 	. "github.com/onsi/gomega"
 
 	"github.com/vulcanize/vulcanizedb/pkg/core"
+	"github.com/vulcanize/vulcanizedb/pkg/eth"
+	"github.com/vulcanize/vulcanizedb/pkg/eth/client"
+	rpc2 "github.com/vulcanize/vulcanizedb/pkg/eth/converters/rpc"
+	"github.com/vulcanize/vulcanizedb/pkg/eth/node"
 	"github.com/vulcanize/vulcanizedb/pkg/fakes"
-	"github.com/vulcanize/vulcanizedb/pkg/geth"
-	"github.com/vulcanize/vulcanizedb/pkg/geth/client"
-	rpc2 "github.com/vulcanize/vulcanizedb/pkg/geth/converters/rpc"
-	"github.com/vulcanize/vulcanizedb/pkg/geth/node"
 	"github.com/vulcanize/vulcanizedb/pkg/history"
 	"github.com/vulcanize/vulcanizedb/test_config"
 )
 
 var _ = Describe("Reading from the Geth blockchain", func() {
-	var blockChain *geth.BlockChain
+	var blockChain *eth.BlockChain
 
 	BeforeEach(func() {
 		rawRpcClient, err := rpc.Dial(test_config.InfuraClient.IPCPath)
@@ -44,7 +44,7 @@ var _ = Describe("Reading from the Geth blockchain", func() {
 		blockChainClient := client.NewEthClient(ethClient)
 		node := node.MakeNode(rpcClient)
 		transactionConverter := rpc2.NewRpcTransactionConverter(ethClient)
-		blockChain = geth.NewBlockChain(blockChainClient, rpcClient, node, transactionConverter)
+		blockChain = eth.NewBlockChain(blockChainClient, rpcClient, node, transactionConverter)
 	})
 
 	It("reads two blocks", func(done Done) {

integration_test/integration_test_suite_test.go

@@ -17,6 +17,8 @@
 package integration_test
 
 import (
+	"github.com/sirupsen/logrus"
+	"io/ioutil"
 	"testing"
 
 	. "github.com/onsi/ginkgo"
@@ -27,3 +29,7 @@ func TestIntegrationTest(t *testing.T) {
 	RegisterFailHandler(Fail)
 	RunSpecs(t, "IntegrationTest Suite")
 }
+
+var _ = BeforeSuite(func() {
+	logrus.SetOutput(ioutil.Discard)
+})

libraries/shared/factories/event/converter.go

@@ -16,9 +16,13 @@
 
 package event
 
-import "github.com/vulcanize/vulcanizedb/pkg/core"
+import (
+	"github.com/vulcanize/vulcanizedb/pkg/core"
+	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
+)
 
+// Converter transforms log data into general InsertionModels the Repository can persist__
 type Converter interface {
-	ToEntities(contractAbi string, ethLog []core.HeaderSyncLog) ([]interface{}, error)
-	ToModels([]interface{}) ([]interface{}, error)
+	ToModels(contractAbi string, ethLog []core.HeaderSyncLog) ([]InsertionModel, error)
+	SetDB(db *postgres.DB)
 }

libraries/shared/factories/event/repository.go

@@ -16,9 +16,163 @@
 
 package event
 
-import "github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
+import (
+	"database/sql/driver"
+	"fmt"
+	"github.com/vulcanize/vulcanizedb/utils"
+	"strings"
 
+	"github.com/sirupsen/logrus"
+	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
+)
+
+const SetLogTransformedQuery = `UPDATE public.header_sync_logs SET transformed = true WHERE id = $1`
+
+// Repository persists transformed values to the DB
 type Repository interface {
-	Create(models []interface{}) error
+	Create(models []InsertionModel) error
 	SetDB(db *postgres.DB)
 }
+
+// LogFK is the name of log foreign key columns
+const LogFK ColumnName = "log_id"
+
+// AddressFK is the name of address foreign key columns
+const AddressFK ColumnName = "address_id"
+
+// HeaderFK is the name of header foreign key columns
+const HeaderFK ColumnName = "header_id"
+
+// SchemaName is the schema to work with
+type SchemaName string
+
+// TableName identifies the table for inserting the data
+type TableName string
+
+// ColumnName identifies columns on the given table
+type ColumnName string
+
+// ColumnValues maps a column to the value for insertion. This is restricted to []byte, bool, float64, int64, string, time.Time
+type ColumnValues map[ColumnName]interface{}
+
+// ErrUnsupportedValue is thrown when a model supplies a type of value the postgres driver cannot handle.
+var ErrUnsupportedValue = func(value interface{}) error {
+	return fmt.Errorf("unsupported type of value supplied in model: %v (%T)", value, value)
+}
+
+// InsertionModel is the generalised data structure a converter returns, and contains everything the repository needs to
+// persist the converted data.
+type InsertionModel struct {
+	SchemaName     SchemaName
+	TableName      TableName
+	OrderedColumns []ColumnName // Defines the fields to insert, and in which order the table expects them
+	ColumnValues   ColumnValues // Associated values for columns, restricted to []byte, bool, float64, int64, string, time.Time
+}
+
+// ModelToQuery stores memoised insertion queries to minimise computation
+var ModelToQuery = map[string]string{}
+
+// GetMemoizedQuery gets/creates a DB insertion query for the model
+func GetMemoizedQuery(model InsertionModel) string {
+	// The schema and table name uniquely determines the insertion query, use that for memoization
+	queryKey := string(model.SchemaName) + string(model.TableName)
+	query, queryMemoized := ModelToQuery[queryKey]
+	if !queryMemoized {
+		query = GenerateInsertionQuery(model)
+		ModelToQuery[queryKey] = query
+	}
+	return query
+}
+
+// GenerateInsertionQuery creates an SQL insertion query from an insertion model.
+// Should be called through GetMemoizedQuery, so the query is not generated on each call to Create.
+func GenerateInsertionQuery(model InsertionModel) string {
+	var valuePlaceholders []string
+	var updateOnConflict []string
+	for i := 0; i < len(model.OrderedColumns); i++ {
+		valuePlaceholder := fmt.Sprintf("$%d", 1+i)
+		valuePlaceholders = append(valuePlaceholders, valuePlaceholder)
+		updateOnConflict = append(updateOnConflict,
+			fmt.Sprintf("%s = %s", model.OrderedColumns[i], valuePlaceholder))
+	}
+
+	baseQuery := `INSERT INTO %v.%v (%v) VALUES(%v)
+		ON CONFLICT (header_id, log_id) DO UPDATE SET %v;`
+
+	return fmt.Sprintf(baseQuery,
+		model.SchemaName,
+		model.TableName,
+		joinOrderedColumns(model.OrderedColumns),
+		strings.Join(valuePlaceholders, ", "),
+		strings.Join(updateOnConflict, ", "))
+}
+
+/*
+Create generates an insertion query and persists to the DB, given a slice of InsertionModels.
+ColumnValues are restricted to []byte, bool, float64, int64, string, time.Time.
+
+testModel = shared.InsertionModel{
+	SchemaName:     "public"
+	TableName:      "testEvent",
+	OrderedColumns: []string{"header_id", "log_id", "variable1"},
+	ColumnValues: ColumnValues{
+		"header_id": 303
+		"log_id":   "808",
+		"variable1": "value1",
+	},
+}
+*/
+func Create(models []InsertionModel, db *postgres.DB) error {
+	if len(models) == 0 {
+		return fmt.Errorf("repository got empty model slice")
+	}
+
+	tx, dbErr := db.Beginx()
+	if dbErr != nil {
+		return dbErr
+	}
+
+	for _, model := range models {
+		// Maps can't be iterated over in a reliable manner, so we rely on OrderedColumns to define the order to insert
+		// tx.Exec is variadically typed in the args, so if we wrap in []interface{} we can apply them all automatically
+		var args []interface{}
+		for _, col := range model.OrderedColumns {
+			value := model.ColumnValues[col]
+			// Check whether or not PG can accept the type of value in the model
+			okPgValue := driver.IsValue(value)
+			if !okPgValue {
+				logrus.WithField("model", model).Errorf("PG cannot handle value of this type: %T", value)
+				return ErrUnsupportedValue(value)
+			}
+			args = append(args, value)
+		}
+
+		insertionQuery := GetMemoizedQuery(model)
+		_, execErr := tx.Exec(insertionQuery, args...) // couldn't pass varying types in bulk with args :: []string
+
+		if execErr != nil {
+			rollbackErr := tx.Rollback()
+			if rollbackErr != nil {
+				logrus.Error("failed to rollback ", rollbackErr)
+			}
+			return execErr
+		}
+
+		_, logErr := tx.Exec(SetLogTransformedQuery, model.ColumnValues[LogFK])
+
+		if logErr != nil {
+			utils.RollbackAndLogFailure(tx, logErr, "header_sync_logs.transformed")
+			return logErr
+		}
+	}
+
+	return tx.Commit()
+}
+
+func joinOrderedColumns(columns []ColumnName) string {
+	var stringColumns []string
+	for _, columnName := range columns {
+		stringColumns = append(stringColumns, string(columnName))
+	}
+	return strings.Join(stringColumns, ", ")
+}

libraries/shared/factories/event/repository_test.go

@@ -0,0 +1,204 @@
+// VulcanizeDB
+// Copyright © 2019 Vulcanize
+
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package event_test
+
+import (
+	"fmt"
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+	"github.com/vulcanize/vulcanizedb/libraries/shared/factories/event"
+	"github.com/vulcanize/vulcanizedb/libraries/shared/test_data"
+	"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/test_config"
+	"math/big"
+)
+
+var _ = Describe("Repository", func() {
+	var db *postgres.DB
+
+	BeforeEach(func() {
+		db = test_config.NewTestDB(test_config.NewTestNode())
+		test_config.CleanTestDB(db)
+	})
+
+	Describe("Create", func() {
+		const createTestEventTableQuery = `CREATE TABLE public.testEvent(
+		id        SERIAL PRIMARY KEY,
+		header_id INTEGER NOT NULL REFERENCES headers (id) ON DELETE CASCADE,
+		log_id    BIGINT  NOT NULL REFERENCES header_sync_logs (id) ON DELETE CASCADE,
+		variable1 TEXT,
+		UNIQUE (header_id, log_id)
+		);`
+
+		var (
+			headerID, logID  int64
+			headerRepository repositories.HeaderRepository
+			testModel        event.InsertionModel
+		)
+
+		BeforeEach(func() {
+			_, tableErr := db.Exec(createTestEventTableQuery)
+			Expect(tableErr).NotTo(HaveOccurred())
+			headerRepository = repositories.NewHeaderRepository(db)
+			var insertHeaderErr error
+			headerID, insertHeaderErr = headerRepository.CreateOrUpdateHeader(fakes.FakeHeader)
+			Expect(insertHeaderErr).NotTo(HaveOccurred())
+			headerSyncLog := test_data.CreateTestLog(headerID, db)
+			logID = headerSyncLog.ID
+
+			testModel = event.InsertionModel{
+				SchemaName: "public",
+				TableName:  "testEvent",
+				OrderedColumns: []event.ColumnName{
+					event.HeaderFK, event.LogFK, "variable1",
+				},
+				ColumnValues: event.ColumnValues{
+					event.HeaderFK: headerID,
+					event.LogFK:    logID,
+					"variable1":    "value1",
+				},
+			}
+		})
+
+		AfterEach(func() {
+			db.MustExec(`DROP TABLE public.testEvent;`)
+		})
+
+		// Needs to run before the other tests, since those insert keys in map
+		It("memoizes queries", func() {
+			Expect(len(event.ModelToQuery)).To(Equal(0))
+			event.GetMemoizedQuery(testModel)
+			Expect(len(event.ModelToQuery)).To(Equal(1))
+			event.GetMemoizedQuery(testModel)
+			Expect(len(event.ModelToQuery)).To(Equal(1))
+		})
+
+		It("persists a model to postgres", func() {
+			createErr := event.Create([]event.InsertionModel{testModel}, db)
+			Expect(createErr).NotTo(HaveOccurred())
+
+			var res TestEvent
+			dbErr := db.Get(&res, `SELECT log_id, variable1 FROM public.testEvent;`)
+			Expect(dbErr).NotTo(HaveOccurred())
+
+			Expect(res.LogID).To(Equal(fmt.Sprint(testModel.ColumnValues[event.LogFK])))
+			Expect(res.Variable1).To(Equal(testModel.ColumnValues["variable1"]))
+		})
+
+		Describe("returns errors", func() {
+			It("for empty model slice", func() {
+				err := event.Create([]event.InsertionModel{}, db)
+				Expect(err).To(MatchError("repository got empty model slice"))
+			})
+
+			It("for failed SQL inserts", func() {
+				header := fakes.GetFakeHeader(1)
+				headerID, headerErr := headerRepository.CreateOrUpdateHeader(header)
+				Expect(headerErr).NotTo(HaveOccurred())
+
+				brokenModel := event.InsertionModel{
+					SchemaName: "public",
+					TableName:  "testEvent",
+					// Wrong name of last column compared to DB, will generate incorrect query
+					OrderedColumns: []event.ColumnName{
+						event.HeaderFK, event.LogFK, "variable2",
+					},
+					ColumnValues: event.ColumnValues{
+						event.HeaderFK: headerID,
+						event.LogFK:    logID,
+						"variable1":    "value1",
+					},
+				}
+
+				// Remove cached queries, or we won't generate a new (incorrect) one
+				delete(event.ModelToQuery, "publictestEvent")
+
+				createErr := event.Create([]event.InsertionModel{brokenModel}, db)
+				// Remove incorrect query, so other tests won't get it
+				delete(event.ModelToQuery, "publictestEvent")
+
+				Expect(createErr).To(HaveOccurred())
+			})
+
+			It("for unsupported types in ColumnValue", func() {
+				unsupportedValue := big.NewInt(5)
+				testModel = event.InsertionModel{
+					SchemaName: "public",
+					TableName:  "testEvent",
+					OrderedColumns: []event.ColumnName{
+						event.HeaderFK, event.LogFK, "variable1",
+					},
+					ColumnValues: event.ColumnValues{
+						event.HeaderFK: headerID,
+						event.LogFK:    logID,
+						"variable1":    unsupportedValue,
+					},
+				}
+
+				createErr := event.Create([]event.InsertionModel{testModel}, db)
+				Expect(createErr).To(MatchError(event.ErrUnsupportedValue(unsupportedValue)))
+			})
+		})
+
+		It("upserts queries with conflicting source", func() {
+			conflictingModel := event.InsertionModel{
+				SchemaName: "public",
+				TableName:  "testEvent",
+				OrderedColumns: []event.ColumnName{
+					event.HeaderFK, event.LogFK, "variable1",
+				},
+				ColumnValues: event.ColumnValues{
+					event.HeaderFK: headerID,
+					event.LogFK:    logID,
+					"variable1":    "conflictingValue",
+				},
+			}
+
+			createErr := event.Create([]event.InsertionModel{testModel, conflictingModel}, db)
+			Expect(createErr).NotTo(HaveOccurred())
+
+			var res TestEvent
+			dbErr := db.Get(&res, `SELECT log_id, variable1 FROM public.testEvent;`)
+			Expect(dbErr).NotTo(HaveOccurred())
+			Expect(res.Variable1).To(Equal(conflictingModel.ColumnValues["variable1"]))
+		})
+
+		It("generates correct queries", func() {
+			actualQuery := event.GenerateInsertionQuery(testModel)
+			expectedQuery := `INSERT INTO public.testEvent (header_id, log_id, variable1) VALUES($1, $2, $3)
+		ON CONFLICT (header_id, log_id) DO UPDATE SET header_id = $1, log_id = $2, variable1 = $3;`
+			Expect(actualQuery).To(Equal(expectedQuery))
+		})
+
+		It("marks log transformed", func() {
+			createErr := event.Create([]event.InsertionModel{testModel}, db)
+			Expect(createErr).NotTo(HaveOccurred())
+
+			var logTransformed bool
+			getErr := db.Get(&logTransformed, `SELECT transformed FROM public.header_sync_logs WHERE id = $1`, logID)
+			Expect(getErr).NotTo(HaveOccurred())
+			Expect(logTransformed).To(BeTrue())
+		})
+	})
+})
+
+type TestEvent struct {
+	LogID     string `db:"log_id"`
+	Variable1 string
+}

libraries/shared/factories/event/transformer.go

@@ -30,6 +30,7 @@ type Transformer struct {
 }
 
 func (transformer Transformer) NewTransformer(db *postgres.DB) transformer.EventTransformer {
+	transformer.Converter.SetDB(db)
 	transformer.Repository.SetDB(db)
 	return transformer
 }
@@ -42,13 +43,7 @@ func (transformer Transformer) Execute(logs []core.HeaderSyncLog) error {
 		return nil
 	}
 
-	entities, err := transformer.Converter.ToEntities(config.ContractAbi, logs)
-	if err != nil {
-		logrus.Errorf("error converting logs to entities in %v: %v", transformerName, err)
-		return err
-	}
-
-	models, err := transformer.Converter.ToModels(entities)
+	models, err := transformer.Converter.ToModels(config.ContractAbi, logs)
 	if err != nil {
 		logrus.Errorf("error converting entities to models in %v: %v", transformerName, err)
 		return err

libraries/shared/factories/event/transformer_test.go

@@ -66,12 +66,11 @@ var _ = Describe("Transformer", func() {
 		err := t.Execute([]core.HeaderSyncLog{})
 
 		Expect(err).NotTo(HaveOccurred())
-		Expect(converter.ToEntitiesCalledCounter).To(Equal(0))
 		Expect(converter.ToModelsCalledCounter).To(Equal(0))
 		Expect(repository.CreateCalledCounter).To(Equal(0))
 	})
 
-	It("converts an eth log to an entity", func() {
+	It("converts an eth log to a model", func() {
 		err := t.Execute(logs)
 
 		Expect(err).NotTo(HaveOccurred())
@@ -79,26 +78,7 @@ var _ = Describe("Transformer", func() {
 		Expect(converter.LogsToConvert).To(Equal(logs))
 	})
 
-	It("returns an error if converter fails", func() {
-		converter.ToEntitiesError = fakes.FakeError
-
-		err := t.Execute(logs)
-
-		Expect(err).To(HaveOccurred())
-		Expect(err).To(MatchError(fakes.FakeError))
-	})
-
-	It("converts an entity to a model", func() {
-		converter.EntitiesToReturn = []interface{}{test_data.GenericEntity{}}
-
-		err := t.Execute(logs)
-
-		Expect(err).NotTo(HaveOccurred())
-		Expect(converter.EntitiesToConvert[0]).To(Equal(test_data.GenericEntity{}))
-	})
-
 	It("returns an error if converting to models fails", func() {
-		converter.EntitiesToReturn = []interface{}{test_data.GenericEntity{}}
 		converter.ToModelsError = fakes.FakeError
 
 		err := t.Execute(logs)
@@ -108,12 +88,12 @@ var _ = Describe("Transformer", func() {
 	})
 
 	It("persists the record", func() {
-		converter.ModelsToReturn = []interface{}{test_data.GenericModel{}}
+		converter.ModelsToReturn = []event.InsertionModel{test_data.GenericModel}
 
 		err := t.Execute(logs)
 
 		Expect(err).NotTo(HaveOccurred())
-		Expect(repository.PassedModels[0]).To(Equal(test_data.GenericModel{}))
+		Expect(repository.PassedModels[0]).To(Equal(test_data.GenericModel))
 	})
 
 	It("returns error if persisting the record fails", func() {

libraries/shared/factories/storage/README.md

@@ -31,15 +31,15 @@ The storage transformer depends on contract-specific implementations of code cap
 
 ```golang
 func (transformer Transformer) Execute(row shared.StorageDiffRow) error {
-	metadata, lookupErr := transformer.Mappings.Lookup(row.StorageKey)
+	metadata, lookupErr := transformer.StorageKeysLookup.Lookup(diff.StorageKey)
 	if lookupErr != nil {
 		return lookupErr
 	}
-	value, decodeErr := shared.Decode(row, metadata)
+	value, decodeErr := utils.Decode(diff, metadata)
 	if decodeErr != nil {
 		return decodeErr
 	}
-	return transformer.Repository.Create(row.BlockHeight, row.BlockHash.Hex(), metadata, value)
+	return transformer.Repository.Create(diff.BlockHeight, diff.BlockHash.Hex(), metadata, value)
 }
 ```
 
@@ -47,20 +47,36 @@ func (transformer Transformer) Execute(row shared.StorageDiffRow) error {
 
 In order to watch an additional smart contract, a developer must create three things:
 
-1. Mappings - specify how to identify keys in the contract's storage trie.
+1. StorageKeysLoader - identify keys in the contract's storage trie, providing metadata to describe how associated values should be decoded.
 1. Repository - specify how to persist a parsed version of the storage value matching the recognized storage key.
 1. Instance - create an instance of the storage transformer that uses your mappings and repository.
 
-### Mappings
+### StorageKeysLoader
+
+A `StorageKeysLoader` is used by the `StorageKeysLookup` object on a storage transformer.
 
 ```golang
-type Mappings interface {
-	Lookup(key common.Hash) (shared.StorageValueMetadata, error)
+type KeysLoader interface {
+	LoadMappings() (map[common.Hash]utils.StorageValueMetadata, error)
 	SetDB(db *postgres.DB)
 }
 ```
 
-A contract-specific implementation of the mappings interface enables the storage transformer to fetch metadata associated with a storage key.
+When a key is not found, the lookup object refreshes its known keys by calling the loader.
+
+```golang
+func (lookup *keysLookup) refreshMappings() error {
+	var err error
+	lookup.mappings, err = lookup.loader.LoadMappings()
+	if err != nil {
+		return err
+	}
+	lookup.mappings = utils.AddHashedKeys(lookup.mappings)
+	return nil
+}
+```
+
+A contract-specific implementation of the loader enables the storage transformer to fetch metadata associated with a storage key.
 
 Storage metadata contains: the name of the variable matching the storage key, a raw version of any keys associated with the variable (if the variable is a mapping), and the variable's type.
 
@@ -72,7 +88,7 @@ type StorageValueMetadata struct {
 }
 ```
 
-Keys are only relevant if the variable is a mapping. For example, in the following Solidity code:
+The `Keys` field on the metadata is only relevant if the variable is a mapping. For example, in the following Solidity code:
 
 ```solidity
 pragma solidity ^0.4.0;
@@ -85,7 +101,7 @@ contract Contract {
 
 The metadata for variable `x` would not have any associated keys, but the metadata for a storage key associated with `y` would include the address used to specify that key's index in the mapping.
 
-The `SetDB` function is required for the mappings to connect to the database.
+The `SetDB` function is required for the storage key loader to connect to the database.
 A database connection may be desired when keys in a mapping variable need to be read from log events (e.g. to lookup what addresses may exist in `y`, above).
 
 ### Repository

libraries/shared/factories/storage/keys_loader.go

@@ -14,14 +14,15 @@
 // You should have received a copy of the GNU Affero General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-package repository
+package storage
 
-import "github.com/jmoiron/sqlx"
+import (
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/vulcanize/vulcanizedb/libraries/shared/storage/utils"
+	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
+)
 
-func MarkContractWatcherHeaderCheckedInTransaction(headerID int64, tx *sqlx.Tx, checkedHeadersColumn string) error {
-	_, err := tx.Exec(`INSERT INTO public.checked_headers (header_id, `+checkedHeadersColumn+`)
-		VALUES ($1, $2)
-		ON CONFLICT (header_id) DO
-		UPDATE SET `+checkedHeadersColumn+` = checked_headers.`+checkedHeadersColumn+` + 1`, headerID, 1)
-	return err
+type KeysLoader interface {
+	LoadMappings() (map[common.Hash]utils.StorageValueMetadata, error)
+	SetDB(db *postgres.DB)
 }

libraries/shared/factories/storage/keys_lookup.go

@@ -0,0 +1,66 @@
+// VulcanizeDB
+// Copyright © 2019 Vulcanize
+
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package storage
+
+import (
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/vulcanize/vulcanizedb/libraries/shared/storage/utils"
+	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
+)
+
+type KeysLookup interface {
+	Lookup(key common.Hash) (utils.StorageValueMetadata, error)
+	SetDB(db *postgres.DB)
+}
+
+type keysLookup struct {
+	loader   KeysLoader
+	mappings map[common.Hash]utils.StorageValueMetadata
+}
+
+func NewKeysLookup(loader KeysLoader) KeysLookup {
+	return &keysLookup{loader: loader, mappings: make(map[common.Hash]utils.StorageValueMetadata)}
+}
+
+func (lookup *keysLookup) Lookup(key common.Hash) (utils.StorageValueMetadata, error) {
+	metadata, ok := lookup.mappings[key]
+	if !ok {
+		refreshErr := lookup.refreshMappings()
+		if refreshErr != nil {
+			return metadata, refreshErr
+		}
+		metadata, ok = lookup.mappings[key]
+		if !ok {
+			return metadata, utils.ErrStorageKeyNotFound{Key: key.Hex()}
+		}
+	}
+	return metadata, nil
+}
+
+func (lookup *keysLookup) refreshMappings() error {
+	var err error
+	lookup.mappings, err = lookup.loader.LoadMappings()
+	if err != nil {
+		return err
+	}
+	lookup.mappings = utils.AddHashedKeys(lookup.mappings)
+	return nil
+}
+
+func (lookup *keysLookup) SetDB(db *postgres.DB) {
+	lookup.loader.SetDB(db)
+}

libraries/shared/factories/storage/keys_lookup_test.go

@@ -0,0 +1,113 @@
+// VulcanizeDB
+// Copyright © 2019 Vulcanize
+
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package storage_test
+
+import (
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/crypto"
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+	"github.com/vulcanize/vulcanizedb/libraries/shared/factories/storage"
+	"github.com/vulcanize/vulcanizedb/libraries/shared/mocks"
+	"github.com/vulcanize/vulcanizedb/libraries/shared/storage/utils"
+	"github.com/vulcanize/vulcanizedb/pkg/fakes"
+	"github.com/vulcanize/vulcanizedb/test_config"
+)
+
+var _ = Describe("Storage keys lookup", func() {
+	var (
+		fakeMetadata = utils.GetStorageValueMetadata("name", map[utils.Key]string{}, utils.Uint256)
+		lookup       storage.KeysLookup
+		loader       *mocks.MockStorageKeysLoader
+	)
+
+	BeforeEach(func() {
+		loader = &mocks.MockStorageKeysLoader{}
+		lookup = storage.NewKeysLookup(loader)
+	})
+
+	Describe("Lookup", func() {
+		Describe("when key not found", func() {
+			It("refreshes keys", func() {
+				loader.StorageKeyMappings = map[common.Hash]utils.StorageValueMetadata{fakes.FakeHash: fakeMetadata}
+				_, err := lookup.Lookup(fakes.FakeHash)
+
+				Expect(err).NotTo(HaveOccurred())
+				Expect(loader.LoadMappingsCallCount).To(Equal(1))
+			})
+
+			It("returns error if refreshing keys fails", func() {
+				loader.LoadMappingsError = fakes.FakeError
+
+				_, err := lookup.Lookup(fakes.FakeHash)
+
+				Expect(err).To(HaveOccurred())
+				Expect(err).To(MatchError(fakes.FakeError))
+			})
+		})
+
+		Describe("when key found", func() {
+			BeforeEach(func() {
+				loader.StorageKeyMappings = map[common.Hash]utils.StorageValueMetadata{fakes.FakeHash: fakeMetadata}
+				_, err := lookup.Lookup(fakes.FakeHash)
+				Expect(err).NotTo(HaveOccurred())
+				Expect(loader.LoadMappingsCallCount).To(Equal(1))
+			})
+
+			It("does not refresh keys", func() {
+				_, err := lookup.Lookup(fakes.FakeHash)
+
+				Expect(err).NotTo(HaveOccurred())
+				Expect(loader.LoadMappingsCallCount).To(Equal(1))
+			})
+		})
+
+		It("returns metadata for loaded static key", func() {
+			loader.StorageKeyMappings = map[common.Hash]utils.StorageValueMetadata{fakes.FakeHash: fakeMetadata}
+
+			metadata, err := lookup.Lookup(fakes.FakeHash)
+
+			Expect(err).NotTo(HaveOccurred())
+			Expect(metadata).To(Equal(fakeMetadata))
+		})
+
+		It("returns metadata for hashed version of key (accommodates keys emitted from Geth)", func() {
+			loader.StorageKeyMappings = map[common.Hash]utils.StorageValueMetadata{fakes.FakeHash: fakeMetadata}
+
+			hashedKey := common.BytesToHash(crypto.Keccak256(fakes.FakeHash.Bytes()))
+			metadata, err := lookup.Lookup(hashedKey)
+
+			Expect(err).NotTo(HaveOccurred())
+			Expect(metadata).To(Equal(fakeMetadata))
+		})
+
+		It("returns key not found error if key not found", func() {
+			_, err := lookup.Lookup(fakes.FakeHash)
+
+			Expect(err).To(HaveOccurred())
+			Expect(err).To(MatchError(utils.ErrStorageKeyNotFound{Key: fakes.FakeHash.Hex()}))
+		})
+	})
+
+	Describe("SetDB", func() {
+		It("sets the db on the loader", func() {
+			lookup.SetDB(test_config.NewTestDB(test_config.NewTestNode()))
+
+			Expect(loader.SetDBCalled).To(BeTrue())
+		})
+	})
+})

libraries/shared/factories/storage/transformer.go

@@ -18,20 +18,19 @@ package storage
 
 import (
 	"github.com/ethereum/go-ethereum/common"
-	"github.com/vulcanize/vulcanizedb/libraries/shared/storage"
 	"github.com/vulcanize/vulcanizedb/libraries/shared/storage/utils"
 	"github.com/vulcanize/vulcanizedb/libraries/shared/transformer"
 	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
 )
 
 type Transformer struct {
-	HashedAddress common.Hash
-	Mappings      storage.Mappings
-	Repository    Repository
+	HashedAddress     common.Hash
+	StorageKeysLookup KeysLookup
+	Repository        Repository
 }
 
 func (transformer Transformer) NewTransformer(db *postgres.DB) transformer.StorageTransformer {
-	transformer.Mappings.SetDB(db)
+	transformer.StorageKeysLookup.SetDB(db)
 	transformer.Repository.SetDB(db)
 	return transformer
 }
@@ -41,7 +40,7 @@ func (transformer Transformer) KeccakContractAddress() common.Hash {
 }
 
 func (transformer Transformer) Execute(diff utils.StorageDiff) error {
-	metadata, lookupErr := transformer.Mappings.Lookup(diff.StorageKey)
+	metadata, lookupErr := transformer.StorageKeysLookup.Lookup(diff.StorageKey)
 	if lookupErr != nil {
 		return lookupErr
 	}

libraries/shared/factories/storage/transformer_test.go

@@ -28,18 +28,18 @@ import (
 
 var _ = Describe("Storage transformer", func() {
 	var (
-		mappings   *mocks.MockMappings
-		repository *mocks.MockStorageRepository
-		t          storage.Transformer
+		storageKeysLookup *mocks.MockStorageKeysLookup
+		repository        *mocks.MockStorageRepository
+		t                 storage.Transformer
 	)
 
 	BeforeEach(func() {
-		mappings = &mocks.MockMappings{}
+		storageKeysLookup = &mocks.MockStorageKeysLookup{}
 		repository = &mocks.MockStorageRepository{}
 		t = storage.Transformer{
-			HashedAddress: common.Hash{},
-			Mappings:      mappings,
-			Repository:    repository,
+			HashedAddress:     common.Hash{},
+			StorageKeysLookup: storageKeysLookup,
+			Repository:        repository,
 		}
 	})
 
@@ -53,11 +53,11 @@ var _ = Describe("Storage transformer", func() {
 	It("looks up metadata for storage key", func() {
 		t.Execute(utils.StorageDiff{})
 
-		Expect(mappings.LookupCalled).To(BeTrue())
+		Expect(storageKeysLookup.LookupCalled).To(BeTrue())
 	})
 
 	It("returns error if lookup fails", func() {
-		mappings.LookupErr = fakes.FakeError
+		storageKeysLookup.LookupErr = fakes.FakeError
 
 		err := t.Execute(utils.StorageDiff{})
 
@@ -67,7 +67,7 @@ var _ = Describe("Storage transformer", func() {
 
 	It("creates storage row with decoded data", func() {
 		fakeMetadata := utils.StorageValueMetadata{Type: utils.Address}
-		mappings.Metadata = fakeMetadata
+		storageKeysLookup.Metadata = fakeMetadata
 		rawValue := common.HexToAddress("0x12345")
 		fakeBlockNumber := 123
 		fakeBlockHash := "0x67890"
@@ -91,7 +91,7 @@ var _ = Describe("Storage transformer", func() {
 	It("returns error if creating row fails", func() {
 		rawValue := common.HexToAddress("0x12345")
 		fakeMetadata := utils.StorageValueMetadata{Type: utils.Address}
-		mappings.Metadata = fakeMetadata
+		storageKeysLookup.Metadata = fakeMetadata
 		repository.CreateErr = fakes.FakeError
 
 		err := t.Execute(utils.StorageDiff{StorageValue: rawValue.Hash()})
@@ -118,7 +118,7 @@ var _ = Describe("Storage transformer", func() {
 		}
 
 		It("passes the decoded data items to the repository", func() {
-			mappings.Metadata = fakeMetadata
+			storageKeysLookup.Metadata = fakeMetadata
 			fakeRow := utils.StorageDiff{
 				HashedAddress: common.Hash{},
 				BlockHash:     common.HexToHash(fakeBlockHash),
@@ -140,7 +140,7 @@ var _ = Describe("Storage transformer", func() {
 		})
 
 		It("returns error if creating a row fails", func() {
-			mappings.Metadata = fakeMetadata
+			storageKeysLookup.Metadata = fakeMetadata
 			repository.CreateErr = fakes.FakeError
 
 			err := t.Execute(utils.StorageDiff{StorageValue: rawValue.Hash()})

libraries/shared/mocks/event_converter.go

@@ -16,41 +16,29 @@
 
 package mocks
 
-import "github.com/vulcanize/vulcanizedb/pkg/core"
+import (
+	"github.com/vulcanize/vulcanizedb/libraries/shared/factories/event"
+	"github.com/vulcanize/vulcanizedb/pkg/core"
+	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
+)
 
 type MockConverter struct {
-	ToEntitiesError         error
-	PassedContractAddresses []string
 	ToModelsError           error
-	entityConverterError    error
-	modelConverterError     error
 	ContractAbi             string
 	LogsToConvert           []core.HeaderSyncLog
-	EntitiesToConvert       []interface{}
-	EntitiesToReturn        []interface{}
-	ModelsToReturn          []interface{}
-	ToEntitiesCalledCounter int
+	ModelsToReturn          []event.InsertionModel
+	PassedContractAddresses []string
+	SetDBCalled             bool
 	ToModelsCalledCounter   int
 }
 
-func (converter *MockConverter) ToEntities(contractAbi string, ethLogs []core.HeaderSyncLog) ([]interface{}, error) {
-	for _, log := range ethLogs {
-		converter.PassedContractAddresses = append(converter.PassedContractAddresses, log.Log.Address.Hex())
-	}
-	converter.ContractAbi = contractAbi
-	converter.LogsToConvert = ethLogs
-	return converter.EntitiesToReturn, converter.ToEntitiesError
-}
-
-func (converter *MockConverter) ToModels(entities []interface{}) ([]interface{}, error) {
-	converter.EntitiesToConvert = entities
+func (converter *MockConverter) ToModels(abi string, logs []core.HeaderSyncLog) ([]event.InsertionModel, error) {
+	converter.LogsToConvert = logs
+	converter.ContractAbi = abi
+	converter.ToModelsCalledCounter = converter.ToModelsCalledCounter + 1
 	return converter.ModelsToReturn, converter.ToModelsError
 }
 
-func (converter *MockConverter) SetToEntityConverterError(err error) {
-	converter.entityConverterError = err
-}
-
-func (converter *MockConverter) SetToModelConverterError(err error) {
-	converter.modelConverterError = err
+func (converter *MockConverter) SetDB(db *postgres.DB) {
+	converter.SetDBCalled = true
 }

libraries/shared/mocks/event_repository.go

@@ -17,17 +17,18 @@
 package mocks
 
 import (
+	"github.com/vulcanize/vulcanizedb/libraries/shared/factories/event"
 	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
 )
 
 type MockEventRepository struct {
 	createError         error
-	PassedModels        []interface{}
+	PassedModels        []event.InsertionModel
 	SetDbCalled         bool
 	CreateCalledCounter int
 }
 
-func (repository *MockEventRepository) Create(models []interface{}) error {
+func (repository *MockEventRepository) Create(models []event.InsertionModel) error {
 	repository.PassedModels = models
 	repository.CreateCalledCounter++
 

libraries/shared/mocks/storage_keys_loader.go

@@ -0,0 +1,39 @@
+// VulcanizeDB
+// Copyright © 2019 Vulcanize
+
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package mocks
+
+import (
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/vulcanize/vulcanizedb/libraries/shared/storage/utils"
+	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
+)
+
+type MockStorageKeysLoader struct {
+	LoadMappingsCallCount int
+	LoadMappingsError     error
+	SetDBCalled           bool
+	StorageKeyMappings    map[common.Hash]utils.StorageValueMetadata
+}
+
+func (loader *MockStorageKeysLoader) LoadMappings() (map[common.Hash]utils.StorageValueMetadata, error) {
+	loader.LoadMappingsCallCount++
+	return loader.StorageKeyMappings, loader.LoadMappingsError
+}
+
+func (loader *MockStorageKeysLoader) SetDB(db *postgres.DB) {
+	loader.SetDBCalled = true
+}

libraries/shared/mocks/storage_keys_lookup.go

@@ -18,22 +18,21 @@ package mocks
 
 import (
 	"github.com/ethereum/go-ethereum/common"
-
 	"github.com/vulcanize/vulcanizedb/libraries/shared/storage/utils"
 	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
 )
 
-type MockMappings struct {
+type MockStorageKeysLookup struct {
 	Metadata     utils.StorageValueMetadata
 	LookupCalled bool
 	LookupErr    error
 }
 
-func (mappings *MockMappings) Lookup(key common.Hash) (utils.StorageValueMetadata, error) {
+func (mappings *MockStorageKeysLookup) Lookup(key common.Hash) (utils.StorageValueMetadata, error) {
 	mappings.LookupCalled = true
 	return mappings.Metadata, mappings.LookupErr
 }
 
-func (*MockMappings) SetDB(db *postgres.DB) {
+func (*MockStorageKeysLookup) SetDB(db *postgres.DB) {
 	panic("implement me")
 }

libraries/shared/repository/repository_test.go

@@ -1,67 +0,0 @@
-// VulcanizeDB
-// Copyright © 2019 Vulcanize
-
-// This program is free software: you can redistribute it and/or modify
-// it under the terms of the GNU Affero General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-
-// This program is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-// GNU Affero General Public License for more details.
-
-// You should have received a copy of the GNU Affero General Public License
-// along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-package repository_test
-
-import (
-	. "github.com/onsi/ginkgo"
-	. "github.com/onsi/gomega"
-	"github.com/vulcanize/vulcanizedb/libraries/shared/repository"
-	"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/test_config"
-)
-
-var _ = Describe("", func() {
-	Describe("MarkContractWatcherHeaderCheckedInTransaction", func() {
-		var (
-			checkedHeadersColumn string
-			db                   *postgres.DB
-		)
-
-		BeforeEach(func() {
-			db = test_config.NewTestDB(test_config.NewTestNode())
-			test_config.CleanTestDB(db)
-			checkedHeadersColumn = "test_column_checked"
-			_, migrateErr := db.Exec(`ALTER TABLE public.checked_headers
-				ADD COLUMN ` + checkedHeadersColumn + ` integer`)
-			Expect(migrateErr).NotTo(HaveOccurred())
-		})
-
-		AfterEach(func() {
-			_, cleanupMigrateErr := db.Exec(`ALTER TABLE public.checked_headers DROP COLUMN ` + checkedHeadersColumn)
-			Expect(cleanupMigrateErr).NotTo(HaveOccurred())
-		})
-
-		It("marks passed header as checked within a passed transaction", func() {
-			headerRepository := repositories.NewHeaderRepository(db)
-			headerID, headerErr := headerRepository.CreateOrUpdateHeader(fakes.FakeHeader)
-			Expect(headerErr).NotTo(HaveOccurred())
-			tx, txErr := db.Beginx()
-			Expect(txErr).NotTo(HaveOccurred())
-
-			err := repository.MarkContractWatcherHeaderCheckedInTransaction(headerID, tx, checkedHeadersColumn)
-			Expect(err).NotTo(HaveOccurred())
-			commitErr := tx.Commit()
-			Expect(commitErr).NotTo(HaveOccurred())
-			var checkedCount int
-			fetchErr := db.Get(&checkedCount, `SELECT COUNT(*) FROM public.checked_headers WHERE header_id = $1`, headerID)
-			Expect(fetchErr).NotTo(HaveOccurred())
-			Expect(checkedCount).To(Equal(1))
-		})
-	})
-})

libraries/shared/storage/utils/keys_loader.go

@@ -14,23 +14,14 @@
 // You should have received a copy of the GNU Affero General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-package storage
+package utils
 
 import (
-	"math/big"
-
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/crypto"
-
-	"github.com/vulcanize/vulcanizedb/libraries/shared/storage/utils"
-	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
+	"math/big"
 )
 
-type Mappings interface {
-	Lookup(key common.Hash) (utils.StorageValueMetadata, error)
-	SetDB(db *postgres.DB)
-}
-
 const (
 	IndexZero   = "0000000000000000000000000000000000000000000000000000000000000000"
 	IndexOne    = "0000000000000000000000000000000000000000000000000000000000000001"
@@ -46,32 +37,17 @@ const (
 	IndexEleven = "000000000000000000000000000000000000000000000000000000000000000b"
 )
 
-func AddHashedKeys(currentMappings map[common.Hash]utils.StorageValueMetadata) map[common.Hash]utils.StorageValueMetadata {
-	copyOfCurrentMappings := make(map[common.Hash]utils.StorageValueMetadata)
-	for k, v := range currentMappings {
-		copyOfCurrentMappings[k] = v
-	}
-	for k, v := range copyOfCurrentMappings {
-		currentMappings[hashKey(k)] = v
-	}
-	return currentMappings
-}
-
-func hashKey(key common.Hash) common.Hash {
-	return crypto.Keccak256Hash(key.Bytes())
-}
-
-func GetMapping(indexOnContract, key string) common.Hash {
+func GetStorageKeyForMapping(indexOnContract, key string) common.Hash {
 	keyBytes := common.FromHex(key + indexOnContract)
 	return crypto.Keccak256Hash(keyBytes)
 }
 
-func GetNestedMapping(indexOnContract, primaryKey, secondaryKey string) common.Hash {
+func GetStorageKeyForNestedMapping(indexOnContract, primaryKey, secondaryKey string) common.Hash {
 	primaryMappingIndex := crypto.Keccak256(common.FromHex(primaryKey + indexOnContract))
 	return crypto.Keccak256Hash(common.FromHex(secondaryKey), primaryMappingIndex)
 }
 
-func GetIncrementedKey(original common.Hash, incrementBy int64) common.Hash {
+func GetIncrementedStorageKey(original common.Hash, incrementBy int64) common.Hash {
 	originalMappingAsInt := original.Big()
 	incremented := big.NewInt(0).Add(originalMappingAsInt, big.NewInt(incrementBy))
 	return common.BytesToHash(incremented.Bytes())

libraries/shared/storage/utils/keys_loader_test.go

@@ -1,78 +1,72 @@
-package storage_test
+// VulcanizeDB
+// Copyright © 2019 Vulcanize
+
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package utils_test
 
 import (
 	"github.com/ethereum/go-ethereum/common"
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
-	"github.com/vulcanize/vulcanizedb/libraries/shared/storage"
 	"github.com/vulcanize/vulcanizedb/libraries/shared/storage/utils"
 )
 
-var _ = Describe("Mappings", func() {
-	Describe("AddHashedKeys", func() {
-		It("returns a copy of the map with an additional slot for the hashed version of every key", func() {
-			fakeMap := map[common.Hash]utils.StorageValueMetadata{}
-			fakeStorageKey := common.HexToHash("72c72de6b203d67cb6cd54fc93300109fcc6fd6eac88e390271a3d548794d800")
-			var fakeMappingKey utils.Key = "fakeKey"
-			fakeMetadata := utils.StorageValueMetadata{
-				Name: "fakeName",
-				Keys: map[utils.Key]string{fakeMappingKey: "fakeValue"},
-				Type: utils.Uint48,
-			}
-			fakeMap[fakeStorageKey] = fakeMetadata
-
-			result := storage.AddHashedKeys(fakeMap)
-
-			Expect(len(result)).To(Equal(2))
-			expectedHashedStorageKey := common.HexToHash("2165edb4e1c37b99b60fa510d84f939dd35d5cd1d1c8f299d6456ea09df65a76")
-			Expect(fakeMap[fakeStorageKey]).To(Equal(fakeMetadata))
-			Expect(fakeMap[expectedHashedStorageKey]).To(Equal(fakeMetadata))
-		})
-	})
-
-	Describe("GetMapping", func() {
+var _ = Describe("Storage keys loader utils", func() {
+	Describe("GetStorageKeyForMapping", func() {
 		It("returns the storage key for a mapping when passed the mapping's index on the contract and the desired value's key", func() {
 			// ex. solidity:
 			//    	mapping (bytes32 => uint) public amounts
 			// to access amounts, pass in the index of the mapping on the contract + the bytes32 key for the uint val being looked up
-			indexOfMappingOnContract := storage.IndexZero
+			indexOfMappingOnContract := utils.IndexZero
 			keyForDesiredValueInMapping := "1234567890abcdef"
 
-			storageKey := storage.GetMapping(indexOfMappingOnContract, keyForDesiredValueInMapping)
+			storageKey := utils.GetStorageKeyForMapping(indexOfMappingOnContract, keyForDesiredValueInMapping)
 
 			expectedStorageKey := common.HexToHash("0xee0c1b59a3856bafbfb8730e7694c4badc271eb5f01ce4a8d7a53d8a6499676f")
 			Expect(storageKey).To(Equal(expectedStorageKey))
 		})
 
 		It("returns same result if value includes hex prefix", func() {
-			indexOfMappingOnContract := storage.IndexZero
+			indexOfMappingOnContract := utils.IndexZero
 			keyForDesiredValueInMapping := "0x1234567890abcdef"
 
-			storageKey := storage.GetMapping(indexOfMappingOnContract, keyForDesiredValueInMapping)
+			storageKey := utils.GetStorageKeyForMapping(indexOfMappingOnContract, keyForDesiredValueInMapping)
 
 			expectedStorageKey := common.HexToHash("0xee0c1b59a3856bafbfb8730e7694c4badc271eb5f01ce4a8d7a53d8a6499676f")
 			Expect(storageKey).To(Equal(expectedStorageKey))
 		})
 	})
 
-	Describe("GetNestedMapping", func() {
+	Describe("GetStorageKeyForNestedMapping", func() {
 		It("returns the storage key for a nested mapping when passed the mapping's index on the contract and the desired value's keys", func() {
 			// ex. solidity:
 			//    	mapping (bytes32 => uint) public amounts
 			//    	mapping (address => mapping (uint => bytes32)) public addressNames
 			// to access addressNames, pass in the index of the mapping on the contract + the address and uint keys for the bytes32 val being looked up
-			indexOfMappingOnContract := storage.IndexOne
+			indexOfMappingOnContract := utils.IndexOne
 			keyForOuterMapping := "1234567890abcdef"
 			keyForInnerMapping := "123"
 
-			storageKey := storage.GetNestedMapping(indexOfMappingOnContract, keyForOuterMapping, keyForInnerMapping)
+			storageKey := utils.GetStorageKeyForNestedMapping(indexOfMappingOnContract, keyForOuterMapping, keyForInnerMapping)
 
 			expectedStorageKey := common.HexToHash("0x82113529f6cd61061d1a6f0de53f2bdd067a1addd3d2b46be50a99abfcdb1661")
 			Expect(storageKey).To(Equal(expectedStorageKey))
 		})
 	})
 
-	Describe("GetIncrementedKey", func() {
+	Describe("GetIncrementedStorageKey", func() {
 		It("returns the storage key for later values sharing an index on the contract with other earlier values", func() {
 			// ex. solidity:
 			//    	mapping (bytes32 => uint) public amounts
@@ -84,11 +78,11 @@ var _ = Describe("Mappings", func() {
 			//    	mapping (bytes32 => Data) public itemData;
 			// to access quality from itemData, pass in the storage key for the zero-indexed value (quantity) + the number of increments required.
 			// (For "quality", we must increment the storage key for the corresponding "quantity" by 1).
-			indexOfMappingOnContract := storage.IndexTwo
+			indexOfMappingOnContract := utils.IndexTwo
 			keyForDesiredValueInMapping := "1234567890abcdef"
-			storageKeyForFirstPropertyOnStruct := storage.GetMapping(indexOfMappingOnContract, keyForDesiredValueInMapping)
+			storageKeyForFirstPropertyOnStruct := utils.GetStorageKeyForMapping(indexOfMappingOnContract, keyForDesiredValueInMapping)
 
-			storageKey := storage.GetIncrementedKey(storageKeyForFirstPropertyOnStruct, 1)
+			storageKey := utils.GetIncrementedStorageKey(storageKeyForFirstPropertyOnStruct, 1)
 
 			expectedStorageKey := common.HexToHash("0x69b38749f0a8ed5d505c8474f7fb62c7828aad8a7627f1c67e07af1d2368cad4")
 			Expect(storageKey).To(Equal(expectedStorageKey))

libraries/shared/storage/utils/keys_lookup.go

@@ -0,0 +1,37 @@
+// VulcanizeDB
+// Copyright © 2019 Vulcanize
+
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package utils
+
+import (
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/crypto"
+)
+
+func AddHashedKeys(currentMappings map[common.Hash]StorageValueMetadata) map[common.Hash]StorageValueMetadata {
+	copyOfCurrentMappings := make(map[common.Hash]StorageValueMetadata)
+	for k, v := range currentMappings {
+		copyOfCurrentMappings[k] = v
+	}
+	for k, v := range copyOfCurrentMappings {
+		currentMappings[hashKey(k)] = v
+	}
+	return currentMappings
+}
+
+func hashKey(key common.Hash) common.Hash {
+	return crypto.Keccak256Hash(key.Bytes())
+}

libraries/shared/storage/utils/keys_lookup_test.go

@@ -0,0 +1,47 @@
+// VulcanizeDB
+// Copyright © 2019 Vulcanize
+
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package utils_test
+
+import (
+	"github.com/ethereum/go-ethereum/common"
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+	"github.com/vulcanize/vulcanizedb/libraries/shared/storage/utils"
+)
+
+var _ = Describe("Storage keys lookup utils", func() {
+	Describe("AddHashedKeys", func() {
+		It("returns a copy of the map with an additional slot for the hashed version of every key", func() {
+			fakeMap := map[common.Hash]utils.StorageValueMetadata{}
+			fakeStorageKey := common.HexToHash("72c72de6b203d67cb6cd54fc93300109fcc6fd6eac88e390271a3d548794d800")
+			var fakeMappingKey utils.Key = "fakeKey"
+			fakeMetadata := utils.StorageValueMetadata{
+				Name: "fakeName",
+				Keys: map[utils.Key]string{fakeMappingKey: "fakeValue"},
+				Type: utils.Uint48,
+			}
+			fakeMap[fakeStorageKey] = fakeMetadata
+
+			result := utils.AddHashedKeys(fakeMap)
+
+			Expect(len(result)).To(Equal(2))
+			expectedHashedStorageKey := common.HexToHash("2165edb4e1c37b99b60fa510d84f939dd35d5cd1d1c8f299d6456ea09df65a76")
+			Expect(fakeMap[fakeStorageKey]).To(Equal(fakeMetadata))
+			Expect(fakeMap[expectedHashedStorageKey]).To(Equal(fakeMetadata))
+		})
+	})
+})

libraries/shared/test_data/generic.go

@@ -20,14 +20,12 @@ import (
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/common/hexutil"
 	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/vulcanize/vulcanizedb/libraries/shared/factories/event"
 	"github.com/vulcanize/vulcanizedb/libraries/shared/transformer"
 	"math/rand"
 	"time"
 )
 
-type GenericModel struct{}
-type GenericEntity struct{}
-
 var startingBlockNumber = rand.Int63()
 var topic0 = "0x" + randomString(64)
 
@@ -44,6 +42,8 @@ var GenericTestLog = func() types.Log {
 	}
 }
 
+var GenericModel = event.InsertionModel{}
+
 var GenericTestConfig = transformer.EventTransformerConfig{
 	TransformerName:     "generic-test-transformer",
 	ContractAddresses:   []string{fakeAddress().Hex()},

libraries/shared/test_data/test_helpers.go

@@ -0,0 +1,37 @@
+package test_data
+
+import (
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/core/types"
+	. "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"
+	"math/rand"
+)
+
+// Create a header sync log to reference in an event, returning inserted header sync log
+func CreateTestLog(headerID int64, db *postgres.DB) core.HeaderSyncLog {
+	log := types.Log{
+		Address:     common.Address{},
+		Topics:      nil,
+		Data:        nil,
+		BlockNumber: 0,
+		TxHash:      common.Hash{},
+		TxIndex:     uint(rand.Int31()),
+		BlockHash:   common.Hash{},
+		Index:       0,
+		Removed:     false,
+	}
+	headerSyncLogRepository := repositories.NewHeaderSyncLogRepository(db)
+	insertLogsErr := headerSyncLogRepository.CreateHeaderSyncLogs(headerID, []types.Log{log})
+	Expect(insertLogsErr).NotTo(HaveOccurred())
+	headerSyncLogs, getLogsErr := headerSyncLogRepository.GetUntransformedHeaderSyncLogs()
+	Expect(getLogsErr).NotTo(HaveOccurred())
+	for _, headerSyncLog := range headerSyncLogs {
+		if headerSyncLog.Log.TxIndex == log.TxIndex {
+			return headerSyncLog
+		}
+	}
+	panic("couldn't find inserted test log")
+}

pkg/config/contract.go

@@ -19,7 +19,7 @@ package config
 import (
 	log "github.com/sirupsen/logrus"
 	"github.com/spf13/viper"
-	"github.com/vulcanize/vulcanizedb/pkg/geth"
+	"github.com/vulcanize/vulcanizedb/pkg/eth"
 	"strings"
 )
 
@@ -98,7 +98,7 @@ func (contractConfig *ContractConfig) PrepConfig() {
 			}
 		}
 		if abi != "" {
-			if _, abiErr := geth.ParseAbi(abi); abiErr != nil {
+			if _, abiErr := eth.ParseAbi(abi); abiErr != nil {
 				log.Fatal(addr, "transformer `abi` not valid JSON")
 			}
 		}

pkg/contract_watcher/full/converter/converter.go

@@ -17,7 +17,6 @@
 package converter
 
 import (
-	"errors"
 	"fmt"
 	"math/big"
 	"strconv"
@@ -32,22 +31,24 @@ import (
 	"github.com/vulcanize/vulcanizedb/pkg/core"
 )
 
-// Converter is used to convert watched event logs to
+// ConverterInterface is used to convert watched event logs to
 // custom logs containing event input name => value maps
 type ConverterInterface interface {
 	Convert(watchedEvent core.WatchedEvent, event types.Event) (*types.Log, error)
 	Update(info *contract.Contract)
 }
 
+// Converter is the underlying struct for the ConverterInterface
 type Converter struct {
 	ContractInfo *contract.Contract
 }
 
+// Update configures the converter for a specific contract
 func (c *Converter) Update(info *contract.Contract) {
 	c.ContractInfo = info
 }
 
-// Convert the given watched event log into a types.Log for the given event
+// Convert converts the given watched event log into a types.Log for the given event
 func (c *Converter) Convert(watchedEvent core.WatchedEvent, event types.Event) (*types.Log, error) {
 	boundContract := bind.NewBoundContract(common.HexToAddress(c.ContractInfo.Address), c.ContractInfo.ParsedAbi, nil, nil, nil)
 	values := make(map[string]interface{})
@@ -88,14 +89,14 @@ func (c *Converter) Convert(watchedEvent core.WatchedEvent, event types.Event) (
 			b := input.(byte)
 			strValues[fieldName] = string(b)
 		default:
-			return nil, errors.New(fmt.Sprintf("error: unhandled abi type %T", input))
+			return nil, fmt.Errorf("error: unhandled abi type %T", input)
 		}
 	}
 
 	// Only hold onto logs that pass our address filter, if any
 	if c.ContractInfo.PassesEventFilter(strValues) {
 		eventLog := &types.Log{
-			Id:     watchedEvent.LogID,
+			ID:     watchedEvent.LogID,
 			Values: strValues,
 			Block:  watchedEvent.BlockNumber,
 			Tx:     watchedEvent.TxHash,

pkg/contract_watcher/full/retriever/block_retriever.go

@@ -18,11 +18,12 @@ package retriever
 
 import (
 	"database/sql"
+
 	"github.com/vulcanize/vulcanizedb/libraries/shared/repository"
 	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
 )
 
-// Block retriever is used to retrieve the first block for a given contract and the most recent block
+// BlockRetriever is used to retrieve the first block for a given contract and the most recent block
 // It requires a vDB synced database with blocks, transactions, receipts, and logs
 type BlockRetriever interface {
 	RetrieveFirstBlock(contractAddr string) (int64, error)
@@ -33,13 +34,15 @@ type blockRetriever struct {
 	db *postgres.DB
 }
 
-func NewBlockRetriever(db *postgres.DB) (r *blockRetriever) {
+// NewBlockRetriever returns a new BlockRetriever
+func NewBlockRetriever(db *postgres.DB) BlockRetriever {
 	return &blockRetriever{
 		db: db,
 	}
 }
 
-// Try both methods of finding the first block, with the receipt method taking precedence
+// RetrieveFirstBlock fetches the block number for the earliest block in the db
+// Tries both methods of finding the first block, with the receipt method taking precedence
 func (r *blockRetriever) RetrieveFirstBlock(contractAddr string) (int64, error) {
 	i, err := r.retrieveFirstBlockFromReceipts(contractAddr)
 	if err != nil {
@@ -55,7 +58,7 @@ func (r *blockRetriever) RetrieveFirstBlock(contractAddr string) (int64, error)
 // For some contracts the contract creation transaction receipt doesn't have the contract address so this doesn't work (e.g. Sai)
 func (r *blockRetriever) retrieveFirstBlockFromReceipts(contractAddr string) (int64, error) {
 	var firstBlock int64
-	addressId, getAddressErr := repository.GetOrCreateAddress(r.db, contractAddr)
+	addressID, getAddressErr := repository.GetOrCreateAddress(r.db, contractAddr)
 	if getAddressErr != nil {
 		return firstBlock, getAddressErr
 	}
@@ -66,7 +69,7 @@ func (r *blockRetriever) retrieveFirstBlockFromReceipts(contractAddr string) (in
                            WHERE contract_address_id = $1
 		                   ORDER BY block_id ASC
 					       LIMIT 1)`,
-		addressId,
+		addressID,
 	)
 
 	return firstBlock, err
@@ -84,7 +87,7 @@ func (r *blockRetriever) retrieveFirstBlockFromLogs(contractAddr string) (int64,
 	return int64(firstBlock), err
 }
 
-// Method to retrieve the most recent block in vDB
+// RetrieveMostRecentBlock retrieves the most recent block number in vDB
 func (r *blockRetriever) RetrieveMostRecentBlock() (int64, error) {
 	var lastBlock int64
 	err := r.db.Get(

pkg/contract_watcher/full/retriever/block_retriever_test.go

@@ -17,10 +17,11 @@
 package retriever_test
 
 import (
+	"strings"
+
 	"github.com/ethereum/go-ethereum/core/types"
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
-	"strings"
 
 	"github.com/vulcanize/vulcanizedb/pkg/contract_watcher/full/retriever"
 	"github.com/vulcanize/vulcanizedb/pkg/contract_watcher/shared/constants"

pkg/contract_watcher/full/retriever/retriever_suite_test.go

@@ -17,12 +17,12 @@
 package retriever_test
 
 import (
-	"github.com/sirupsen/logrus"
 	"io/ioutil"
 	"testing"
 
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
+	"github.com/sirupsen/logrus"
 )
 
 func TestRetriever(t *testing.T) {

pkg/contract_watcher/full/transformer/transformer.go

@@ -35,6 +35,7 @@ import (
 	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres/repositories"
 )
 
+// Transformer is the top level struct for transforming watched contract data
 // Requires a fully synced vDB and a running eth node (or infura)
 type Transformer struct {
 	// Database interfaces
@@ -60,7 +61,7 @@ type Transformer struct {
 	LastBlock int64
 }
 
-// Transformer takes in config for blockchain, database, and network id
+// NewTransformer takes in contract config, blockchain, and database, and returns a new Transformer
 func NewTransformer(con config.ContractConfig, BC core.BlockChain, DB *postgres.DB) *Transformer {
 	return &Transformer{
 		Poller:                     poller.NewPoller(BC, DB, types.FullSync),
@@ -75,6 +76,7 @@ func NewTransformer(con config.ContractConfig, BC core.BlockChain, DB *postgres.
 	}
 }
 
+// Init initializes the transformer
 // Use after creating and setting transformer
 // Loops over all of the addr => filter sets
 // Uses parser to pull event info from abi
@@ -167,6 +169,7 @@ func (tr *Transformer) Init() error {
 	return nil
 }
 
+// Execute runs the transformation processes
 // Iterates through stored, initialized contract objects
 // Iterates through contract's event filters, grabbing watched event logs
 // Uses converter to convert logs into custom log type
@@ -227,6 +230,7 @@ func (tr *Transformer) Execute() error {
 	return nil
 }
 
+// GetConfig returns the transformers config; satisfies the transformer interface
 func (tr *Transformer) GetConfig() config.ContractConfig {
 	return tr.Config
 }

pkg/contract_watcher/full/transformer/transformer_suite_test.go

@@ -17,12 +17,12 @@
 package transformer_test
 
 import (
-	"github.com/sirupsen/logrus"
 	"io/ioutil"
 	"testing"
 
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
+	"github.com/sirupsen/logrus"
 )
 
 func TestTransformer(t *testing.T) {

pkg/contract_watcher/header/converter/converter.go

@@ -18,7 +18,6 @@ package converter
 
 import (
 	"encoding/json"
-	"errors"
 	"fmt"
 	"math/big"
 	"strconv"
@@ -32,16 +31,19 @@ import (
 	"github.com/vulcanize/vulcanizedb/pkg/contract_watcher/shared/types"
 )
 
+// ConverterInterface is the interface for converting geth logs to our custom log type
 type ConverterInterface interface {
 	Convert(logs []gethTypes.Log, event types.Event, headerID int64) ([]types.Log, error)
 	ConvertBatch(logs []gethTypes.Log, events map[string]types.Event, headerID int64) (map[string][]types.Log, error)
 	Update(info *contract.Contract)
 }
 
+// Converter is the underlying struct for the ConverterInterface
 type Converter struct {
 	ContractInfo *contract.Contract
 }
 
+// Update is used to configure the converter with a specific contract
 func (c *Converter) Update(info *contract.Contract) {
 	c.ContractInfo = info
 }
@@ -98,7 +100,7 @@ func (c *Converter) Convert(logs []gethTypes.Log, event types.Event, headerID in
 				strValues[fieldName] = converted.String()
 				seenHashes = append(seenHashes, converted)
 			default:
-				return nil, errors.New(fmt.Sprintf("error: unhandled abi type %T", input))
+				return nil, fmt.Errorf("error: unhandled abi type %T", input)
 			}
 		}
 
@@ -114,7 +116,7 @@ func (c *Converter) Convert(logs []gethTypes.Log, event types.Event, headerID in
 				Values:           strValues,
 				Raw:              raw,
 				TransactionIndex: log.TxIndex,
-				Id:               headerID,
+				ID:               headerID,
 			})
 
 			// Cache emitted values if their caching is turned on
@@ -130,7 +132,7 @@ func (c *Converter) Convert(logs []gethTypes.Log, event types.Event, headerID in
 	return returnLogs, nil
 }
 
-// Convert the given watched event logs into types.Logs; returns a map of event names to a slice of their converted logs
+// ConvertBatch converts the given watched event logs into types.Logs; returns a map of event names to a slice of their converted logs
 func (c *Converter) ConvertBatch(logs []gethTypes.Log, events map[string]types.Event, headerID int64) (map[string][]types.Log, error) {
 	boundContract := bind.NewBoundContract(common.HexToAddress(c.ContractInfo.Address), c.ContractInfo.ParsedAbi, nil, nil, nil)
 	eventsToLogs := make(map[string][]types.Log)
@@ -182,7 +184,7 @@ func (c *Converter) ConvertBatch(logs []gethTypes.Log, events map[string]types.E
 						strValues[fieldName] = converted.String()
 						seenHashes = append(seenHashes, converted)
 					default:
-						return nil, errors.New(fmt.Sprintf("error: unhandled abi type %T", input))
+						return nil, fmt.Errorf("error: unhandled abi type %T", input)
 					}
 				}
 
@@ -198,7 +200,7 @@ func (c *Converter) ConvertBatch(logs []gethTypes.Log, events map[string]types.E
 						Values:           strValues,
 						Raw:              raw,
 						TransactionIndex: log.TxIndex,
-						Id:               headerID,
+						ID:               headerID,
 					})
 
 					// Cache emitted values that pass the argument filter if their caching is turned on

pkg/contract_watcher/header/converter/converter_test.go

@@ -72,11 +72,11 @@ var _ = Describe("Converter", func() {
 			Expect(logs[0].Values["to"]).To(Equal(sender1.String()))
 			Expect(logs[0].Values["from"]).To(Equal(sender2.String()))
 			Expect(logs[0].Values["value"]).To(Equal(value.String()))
-			Expect(logs[0].Id).To(Equal(int64(232)))
+			Expect(logs[0].ID).To(Equal(int64(232)))
 			Expect(logs[1].Values["to"]).To(Equal(sender2.String()))
 			Expect(logs[1].Values["from"]).To(Equal(sender1.String()))
 			Expect(logs[1].Values["value"]).To(Equal(value.String()))
-			Expect(logs[1].Id).To(Equal(int64(232)))
+			Expect(logs[1].ID).To(Equal(int64(232)))
 		})
 
 		It("Keeps track of addresses it sees if they will be used for method polling", func() {

pkg/contract_watcher/header/fetcher/fetcher.go

@@ -24,6 +24,7 @@ import (
 	"github.com/vulcanize/vulcanizedb/pkg/core"
 )
 
+// Fetcher is the fetching interface
 type Fetcher interface {
 	FetchLogs(contractAddresses []string, topics []common.Hash, missingHeader core.Header) ([]types.Log, error)
 }
@@ -32,13 +33,14 @@ type fetcher struct {
 	blockChain core.BlockChain
 }
 
-func NewFetcher(blockchain core.BlockChain) *fetcher {
+// NewFetcher returns a new Fetcher
+func NewFetcher(blockchain core.BlockChain) Fetcher {
 	return &fetcher{
 		blockChain: blockchain,
 	}
 }
 
-// Checks all topic0s, on all addresses, fetching matching logs for the given header
+// FetchLogs checks all topic0s, on all addresses, fetching matching logs for the given header
 func (fetcher *fetcher) FetchLogs(contractAddresses []string, topic0s []common.Hash, header core.Header) ([]types.Log, error) {
 	addresses := hexStringsToAddresses(contractAddresses)
 	blockHash := common.HexToHash(header.Hash)

pkg/contract_watcher/header/repository/header_repository.go

@@ -20,7 +20,6 @@ import (
 	"fmt"
 
 	"github.com/hashicorp/golang-lru"
-	"github.com/jmoiron/sqlx"
 	"github.com/sirupsen/logrus"
 
 	"github.com/vulcanize/vulcanizedb/pkg/core"
@@ -29,6 +28,7 @@ import (
 
 const columnCacheSize = 1000
 
+// HeaderRepository interfaces with the header and checked_headers tables
 type HeaderRepository interface {
 	AddCheckColumn(id string) error
 	AddCheckColumns(ids []string) error
@@ -46,7 +46,8 @@ type headerRepository struct {
 	columns *lru.Cache // Cache created columns to minimize db connections
 }
 
-func NewHeaderRepository(db *postgres.DB) *headerRepository {
+// NewHeaderRepository returns a new HeaderRepository
+func NewHeaderRepository(db *postgres.DB) HeaderRepository {
 	ccs, _ := lru.New(columnCacheSize)
 	return &headerRepository{
 		db:      db,
@@ -54,7 +55,7 @@ func NewHeaderRepository(db *postgres.DB) *headerRepository {
 	}
 }
 
-// Adds a checked_header column for the provided column id
+// AddCheckColumn adds a checked_header column for the provided column id
 func (r *headerRepository) AddCheckColumn(id string) error {
 	// Check cache to see if column already exists before querying pg
 	_, ok := r.columns.Get(id)
@@ -75,7 +76,7 @@ func (r *headerRepository) AddCheckColumn(id string) error {
 	return nil
 }
 
-// Adds a checked_header column for all of the provided column ids
+// AddCheckColumns adds a checked_header column for all of the provided column ids
 func (r *headerRepository) AddCheckColumns(ids []string) error {
 	var err error
 	baseQuery := "ALTER TABLE public.checked_headers"
@@ -99,7 +100,7 @@ func (r *headerRepository) AddCheckColumns(ids []string) error {
 	return err
 }
 
-// Marks the header checked for the provided column id
+// MarkHeaderChecked marks the header checked for the provided column id
 func (r *headerRepository) MarkHeaderChecked(headerID int64, id string) error {
 	_, err := r.db.Exec(`INSERT INTO public.checked_headers (header_id, `+id+`)
 		VALUES ($1, $2) 
@@ -108,7 +109,7 @@ func (r *headerRepository) MarkHeaderChecked(headerID int64, id string) error {
 	return err
 }
 
-// Marks the header checked for all of the provided column ids
+// MarkHeaderCheckedForAll marks the header checked for all of the provided column ids
 func (r *headerRepository) MarkHeaderCheckedForAll(headerID int64, ids []string) error {
 	pgStr := "INSERT INTO public.checked_headers (header_id, "
 	for _, id := range ids {
@@ -127,7 +128,7 @@ func (r *headerRepository) MarkHeaderCheckedForAll(headerID int64, ids []string)
 	return err
 }
 
-// Marks all of the provided headers checked for each of the provided column ids
+// MarkHeadersCheckedForAll marks all of the provided headers checked for each of the provided column ids
 func (r *headerRepository) MarkHeadersCheckedForAll(headers []core.Header, ids []string) error {
 	tx, err := r.db.Beginx()
 	if err != nil {
@@ -160,7 +161,7 @@ func (r *headerRepository) MarkHeadersCheckedForAll(headers []core.Header, ids [
 	return err
 }
 
-// Returns missing headers for the provided checked_headers column id
+// MissingHeaders returns missing headers for the provided checked_headers column id
 func (r *headerRepository) MissingHeaders(startingBlockNumber, endingBlockNumber int64, id string) ([]core.Header, error) {
 	var result []core.Header
 	var query string
@@ -186,7 +187,7 @@ func (r *headerRepository) MissingHeaders(startingBlockNumber, endingBlockNumber
 	return continuousHeaders(result), err
 }
 
-// Returns missing headers for all of the provided checked_headers column ids
+// MissingHeadersForAll returns missing headers for all of the provided checked_headers column ids
 func (r *headerRepository) MissingHeadersForAll(startingBlockNumber, endingBlockNumber int64, ids []string) ([]core.Header, error) {
 	var result []core.Header
 	var query string
@@ -214,7 +215,7 @@ func (r *headerRepository) MissingHeadersForAll(startingBlockNumber, endingBlock
 	return continuousHeaders(result), err
 }
 
-// Returns headers that have been checked for all of the provided event ids but not for the provided method ids
+// MissingMethodsCheckedEventsIntersection returns headers that have been checked for all of the provided event ids but not for the provided method ids
 func (r *headerRepository) MissingMethodsCheckedEventsIntersection(startingBlockNumber, endingBlockNumber int64, methodIds, eventIds []string) ([]core.Header, error) {
 	var result []core.Header
 	var query string
@@ -264,16 +265,7 @@ func continuousHeaders(headers []core.Header) []core.Header {
 	return headers
 }
 
-// Check the repositories column id cache for a value
+// CheckCache checks the repositories column id cache for a value
 func (r *headerRepository) CheckCache(key string) (interface{}, bool) {
 	return r.columns.Get(key)
 }
-
-// Used to mark a header checked as part of some external transaction so as to group into one commit
-func (r *headerRepository) MarkHeaderCheckedInTransaction(headerID int64, tx *sqlx.Tx, eventID string) error {
-	_, err := tx.Exec(`INSERT INTO public.checked_headers (header_id, `+eventID+`)
-		VALUES ($1, $2) 
-		ON CONFLICT (header_id) DO
-			UPDATE SET `+eventID+` = checked_headers.`+eventID+` + 1`, headerID, 1)
-	return err
-}

pkg/contract_watcher/header/repository/header_repository_test.go

@@ -18,7 +18,6 @@ package repository_test
 
 import (
 	"fmt"
-	"github.com/vulcanize/vulcanizedb/pkg/core"
 
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
@@ -26,6 +25,7 @@ import (
 	"github.com/vulcanize/vulcanizedb/pkg/contract_watcher/header/repository"
 	"github.com/vulcanize/vulcanizedb/pkg/contract_watcher/shared/helpers/test_helpers"
 	"github.com/vulcanize/vulcanizedb/pkg/contract_watcher/shared/helpers/test_helpers/mocks"
+	"github.com/vulcanize/vulcanizedb/pkg/core"
 	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
 	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres/repositories"
 )

pkg/contract_watcher/header/repository/repository_suite_test.go

@@ -17,12 +17,12 @@
 package repository_test
 
 import (
-	"github.com/sirupsen/logrus"
 	"io/ioutil"
 	"testing"
 
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
+	"github.com/sirupsen/logrus"
 )
 
 func TestRepository(t *testing.T) {

pkg/contract_watcher/header/retriever/block_retriever.go

@@ -20,7 +20,7 @@ import (
 	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
 )
 
-// Block retriever is used to retrieve the first block for a given contract and the most recent block
+// BlockRetriever is used to retrieve the first block for a given contract and the most recent block
 // It requires a vDB synced database with blocks, transactions, receipts, and logs
 type BlockRetriever interface {
 	RetrieveFirstBlock() (int64, error)
@@ -31,13 +31,14 @@ type blockRetriever struct {
 	db *postgres.DB
 }
 
-func NewBlockRetriever(db *postgres.DB) (r *blockRetriever) {
+// NewBlockRetriever returns a new BlockRetriever
+func NewBlockRetriever(db *postgres.DB) BlockRetriever {
 	return &blockRetriever{
 		db: db,
 	}
 }
 
-// Retrieve block number of earliest header in repo
+// RetrieveFirstBlock retrieves block number of earliest header in repo
 func (r *blockRetriever) RetrieveFirstBlock() (int64, error) {
 	var firstBlock int
 	err := r.db.Get(
@@ -48,7 +49,7 @@ func (r *blockRetriever) RetrieveFirstBlock() (int64, error) {
 	return int64(firstBlock), err
 }
 
-// Retrieve block number of latest header in repo
+// RetrieveMostRecentBlock retrieves block number of latest header in repo
 func (r *blockRetriever) RetrieveMostRecentBlock() (int64, error) {
 	var lastBlock int
 	err := r.db.Get(

pkg/contract_watcher/header/retriever/retriever_suite_test.go

@@ -17,12 +17,12 @@
 package retriever_test
 
 import (
-	"github.com/sirupsen/logrus"
 	"io/ioutil"
 	"testing"
 
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
+	"github.com/sirupsen/logrus"
 )
 
 func TestRetriever(t *testing.T) {

pkg/contract_watcher/header/transformer/transformer.go

@@ -17,6 +17,7 @@
 package transformer
 
 import (
+	"database/sql"
 	"errors"
 	"fmt"
 	"strings"
@@ -39,6 +40,7 @@ import (
 	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
 )
 
+// Transformer is the top level struct for transforming watched contract data
 // Requires a header synced vDB (headers) and a running eth node (or infura)
 type Transformer struct {
 	// Database interfaces
@@ -75,7 +77,7 @@ type Transformer struct {
 // 3. Init
 // 4. Execute
 
-// Transformer takes in config for blockchain, database, and network id
+// NewTransformer takes in a contract config, blockchain, and database, and returns a new Transformer
 func NewTransformer(con config.ContractConfig, bc core.BlockChain, db *postgres.DB) *Transformer {
 
 	return &Transformer{
@@ -91,6 +93,7 @@ func NewTransformer(con config.ContractConfig, bc core.BlockChain, db *postgres.
 	}
 }
 
+// Init initialized the Transformer
 // Use after creating and setting transformer
 // Loops over all of the addr => filter sets
 // Uses parser to pull event info from abi
@@ -124,7 +127,12 @@ func (tr *Transformer) Init() error {
 		// Get first block and most recent block number in the header repo
 		firstBlock, retrieveErr := tr.Retriever.RetrieveFirstBlock()
 		if retrieveErr != nil {
-			return fmt.Errorf("error retrieving first block: %s", retrieveErr.Error())
+			if retrieveErr == sql.ErrNoRows {
+				logrus.Error(fmt.Errorf("error retrieving first block: %s", retrieveErr.Error()))
+				firstBlock = 0
+			} else {
+				return fmt.Errorf("error retrieving first block: %s", retrieveErr.Error())
+			}
 		}
 
 		// Set to specified range if it falls within the bounds
@@ -170,14 +178,14 @@ func (tr *Transformer) Init() error {
 		// Create checked_headers columns for each event id and append to list of all event ids
 		tr.sortedEventIds[con.Address] = make([]string, 0, len(con.Events))
 		for _, event := range con.Events {
-			eventId := strings.ToLower(event.Name + "_" + con.Address)
-			addColumnErr := tr.HeaderRepository.AddCheckColumn(eventId)
+			eventID := strings.ToLower(event.Name + "_" + con.Address)
+			addColumnErr := tr.HeaderRepository.AddCheckColumn(eventID)
 			if addColumnErr != nil {
 				return fmt.Errorf("error adding check column: %s", addColumnErr.Error())
 			}
 			// Keep track of this event id; sorted and unsorted
-			tr.sortedEventIds[con.Address] = append(tr.sortedEventIds[con.Address], eventId)
-			tr.eventIds = append(tr.eventIds, eventId)
+			tr.sortedEventIds[con.Address] = append(tr.sortedEventIds[con.Address], eventID)
+			tr.eventIds = append(tr.eventIds, eventID)
 			// Append this event sig to the filters
 			tr.eventFilters = append(tr.eventFilters, event.Sig())
 		}
@@ -185,12 +193,12 @@ func (tr *Transformer) Init() error {
 		// Create checked_headers columns for each method id and append list of all method ids
 		tr.sortedMethodIds[con.Address] = make([]string, 0, len(con.Methods))
 		for _, m := range con.Methods {
-			methodId := strings.ToLower(m.Name + "_" + con.Address)
-			addColumnErr := tr.HeaderRepository.AddCheckColumn(methodId)
+			methodID := strings.ToLower(m.Name + "_" + con.Address)
+			addColumnErr := tr.HeaderRepository.AddCheckColumn(methodID)
 			if addColumnErr != nil {
 				return fmt.Errorf("error adding check column: %s", addColumnErr.Error())
 			}
-			tr.sortedMethodIds[con.Address] = append(tr.sortedMethodIds[con.Address], methodId)
+			tr.sortedMethodIds[con.Address] = append(tr.sortedMethodIds[con.Address], methodID)
 		}
 
 		// Update start to the lowest block
@@ -202,6 +210,7 @@ func (tr *Transformer) Init() error {
 	return nil
 }
 
+// Execute runs the transformation processes
 func (tr *Transformer) Execute() error {
 	if len(tr.Contracts) == 0 {
 		return errors.New("error: transformer has no initialized contracts")
@@ -243,7 +252,6 @@ func (tr *Transformer) Execute() error {
 			continue
 		}
 
-		// Sort logs by the contract they belong to
 		for _, log := range allLogs {
 			addr := strings.ToLower(log.Address.Hex())
 			sortedLogs[addr] = append(sortedLogs[addr], log)
@@ -268,16 +276,10 @@ func (tr *Transformer) Execute() error {
 			for eventName, logs := range convertedLogs {
 				// If logs for this event are empty, mark them checked at this header and continue
 				if len(logs) < 1 {
-					eventId := strings.ToLower(eventName + "_" + con.Address)
-					markCheckedErr := tr.HeaderRepository.MarkHeaderChecked(header.Id, eventId)
-					if markCheckedErr != nil {
-						return fmt.Errorf("error marking header checked: %s", markCheckedErr.Error())
-					}
 					logrus.Tracef("no logs found for event %s on contract %s at block %d, continuing", eventName, conAddr, header.BlockNumber)
 					continue
 				}
 				// If logs aren't empty, persist them
-				// Header is marked checked in the transactions
 				persistErr := tr.EventRepository.PersistLogs(logs, con.Events[eventName], con.Address, con.Name)
 				if persistErr != nil {
 					return fmt.Errorf("error persisting logs: %s", persistErr.Error())
@@ -285,6 +287,11 @@ func (tr *Transformer) Execute() error {
 			}
 		}
 
+		markCheckedErr := tr.HeaderRepository.MarkHeaderCheckedForAll(header.Id, tr.eventIds)
+		if markCheckedErr != nil {
+			return fmt.Errorf("error marking header checked: %s", markCheckedErr.Error())
+		}
+
 		// Poll contracts at this block height
 		pollingErr := tr.methodPolling(header, tr.sortedMethodIds)
 		if pollingErr != nil {
@@ -323,6 +330,7 @@ func (tr *Transformer) methodPolling(header core.Header, sortedMethodIds map[str
 	return nil
 }
 
+// GetConfig returns the transformers config; satisfies the transformer interface
 func (tr *Transformer) GetConfig() config.ContractConfig {
 	return tr.Config
 }

pkg/contract_watcher/header/transformer/transformer_suite_test.go

@@ -17,12 +17,12 @@
 package transformer_test
 
 import (
-	"github.com/sirupsen/logrus"
 	"io/ioutil"
 	"testing"
 
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
+	"github.com/sirupsen/logrus"
 )
 
 func TestTransformer(t *testing.T) {

pkg/contract_watcher/header/transformer/transformer_test.go

@@ -17,6 +17,8 @@
 package transformer_test
 
 import (
+	"database/sql"
+
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
 
@@ -101,7 +103,17 @@ var _ = Describe("Transformer", func() {
 			Expect(c.Address).To(Equal(fakeAddress))
 		})
 
-		It("Fails to initialize if first block cannot be fetched from vDB headers table", func() {
+		It("uses first block from config if vDB headers table has no rows", func() {
+			blockRetriever := &fakes.MockHeaderSyncBlockRetriever{}
+			blockRetriever.FirstBlockErr = sql.ErrNoRows
+			t := getFakeTransformer(blockRetriever, &fakes.MockParser{}, &fakes.MockPoller{})
+
+			err := t.Init()
+
+			Expect(err).ToNot(HaveOccurred())
+		})
+
+		It("returns error if fetching first block fails for other reason", func() {
 			blockRetriever := &fakes.MockHeaderSyncBlockRetriever{}
 			blockRetriever.FirstBlockErr = fakes.FakeError
 			t := getFakeTransformer(blockRetriever, &fakes.MockParser{}, &fakes.MockPoller{})

pkg/contract_watcher/shared/constants/interface.go

@@ -20,11 +20,10 @@ import (
 	"github.com/ethereum/go-ethereum/common/hexutil"
 )
 
-// Basic abi needed to check which interfaces are adhered to
+// SupportsInterfaceABI is the basic abi needed to check which interfaces are adhered to
 var SupportsInterfaceABI = `[{"constant":true,"inputs":[{"name":"interfaceID","type":"bytes4"}],"name":"supportsInterface","outputs":[{"name":"","type":"bool"}],"payable":false,"type":"function"}]`
 
 // Individual event interfaces for constructing ABI from
-var SupportsInterface = `{"constant":true,"inputs":[{"name":"interfaceID","type":"bytes4"}],"name":"supportsInterface","outputs":[{"name":"","type":"bool"}],"payable":false,"type":"function"}`
 var AddrChangeInterface = `{"anonymous":false,"inputs":[{"indexed":true,"name":"node","type":"bytes32"},{"indexed":false,"name":"a","type":"address"}],"name":"AddrChanged","type":"event"}`
 var ContentChangeInterface = `{"anonymous":false,"inputs":[{"indexed":true,"name":"node","type":"bytes32"},{"indexed":false,"name":"hash","type":"bytes32"}],"name":"ContentChanged","type":"event"}`
 var NameChangeInterface = `{"anonymous":false,"inputs":[{"indexed":true,"name":"node","type":"bytes32"},{"indexed":false,"name":"name","type":"string"}],"name":"NameChanged","type":"event"}`
@@ -34,11 +33,10 @@ var TextChangeInterface = `{"anonymous":false,"inputs":[{"indexed":true,"name":"
 var MultihashChangeInterface = `{"anonymous":false,"inputs":[{"indexed":true,"name":"node","type":"bytes32"},{"indexed":false,"name":"hash","type":"bytes"}],"name":"MultihashChanged","type":"event"}`
 var ContenthashChangeInterface = `{"anonymous":false,"inputs":[{"indexed":true,"name":"node","type":"bytes32"},{"indexed":false,"name":"hash","type":"bytes"}],"name":"ContenthashChanged","type":"event"}`
 
-var StartingBlock = int64(3648359)
-
 // Resolver interface signatures
 type Interface int
 
+// Interface enums
 const (
 	MetaSig Interface = iota
 	AddrChangeSig
@@ -51,6 +49,7 @@ const (
 	ContentHashChangeSig
 )
 
+// Hex returns the hex signature for an interface
 func (e Interface) Hex() string {
 	strings := [...]string{
 		"0x01ffc9a7",
@@ -71,6 +70,7 @@ func (e Interface) Hex() string {
 	return strings[e]
 }
 
+// Bytes returns the bytes signature for an interface
 func (e Interface) Bytes() [4]uint8 {
 	if e < MetaSig || e > ContentHashChangeSig {
 		return [4]byte{}
@@ -86,6 +86,7 @@ func (e Interface) Bytes() [4]uint8 {
 	return byArray
 }
 
+// EventSig returns the event signature for an interface
 func (e Interface) EventSig() string {
 	strings := [...]string{
 		"",
@@ -106,6 +107,7 @@ func (e Interface) EventSig() string {
 	return strings[e]
 }
 
+// MethodSig returns the method signature for an interface
 func (e Interface) MethodSig() string {
 	strings := [...]string{
 		"supportsInterface(bytes4)",

pkg/contract_watcher/shared/contract/contract.go

@@ -48,6 +48,7 @@ type Contract struct {
 	Piping         bool                         // Whether or not to pipe method results forward as arguments to subsequent methods
 }
 
+// Init initializes a contract object
 // If we will be calling methods that use addr, hash, or byte arrays
 // as arguments then we initialize maps to hold these types of values
 func (c Contract) Init() *Contract {
@@ -66,7 +67,7 @@ func (c Contract) Init() *Contract {
 	return &c
 }
 
-// Use contract info to generate event filters - full sync contract watcher only
+// GenerateFilters uses contract info to generate event filters - full sync contract watcher only
 func (c *Contract) GenerateFilters() error {
 	c.Filters = map[string]filters.LogFilter{}
 
@@ -87,7 +88,7 @@ func (c *Contract) GenerateFilters() error {
 	return nil
 }
 
-// Returns true if address is in list of arguments to
+// WantedEventArg returns true if address is in list of arguments to
 // filter events for or if no filtering is specified
 func (c *Contract) WantedEventArg(arg string) bool {
 	if c.FilterArgs == nil {
@@ -101,7 +102,7 @@ func (c *Contract) WantedEventArg(arg string) bool {
 	return false
 }
 
-// Returns true if address is in list of arguments to
+// WantedMethodArg returns true if address is in list of arguments to
 // poll methods with or if no filtering is specified
 func (c *Contract) WantedMethodArg(arg interface{}) bool {
 	if c.MethodArgs == nil {
@@ -121,7 +122,7 @@ func (c *Contract) WantedMethodArg(arg interface{}) bool {
 	return false
 }
 
-// Returns true if any mapping value matches filtered for address or if no filter exists
+// PassesEventFilter returns true if any mapping value matches filtered for address or if no filter exists
 // Used to check if an event log name-value mapping should be filtered or not
 func (c *Contract) PassesEventFilter(args map[string]string) bool {
 	for _, arg := range args {
@@ -133,7 +134,7 @@ func (c *Contract) PassesEventFilter(args map[string]string) bool {
 	return false
 }
 
-// Add event emitted address to our list if it passes filter and method polling is on
+// AddEmittedAddr adds event emitted addresses to our list if it passes filter and method polling is on
 func (c *Contract) AddEmittedAddr(addresses ...interface{}) {
 	for _, addr := range addresses {
 		if c.WantedMethodArg(addr) && c.Methods != nil {
@@ -142,7 +143,7 @@ func (c *Contract) AddEmittedAddr(addresses ...interface{}) {
 	}
 }
 
-// Add event emitted hash to our list if it passes filter and method polling is on
+// AddEmittedHash adds event emitted hashes to our list if it passes filter and method polling is on
 func (c *Contract) AddEmittedHash(hashes ...interface{}) {
 	for _, hash := range hashes {
 		if c.WantedMethodArg(hash) && c.Methods != nil {
@@ -151,6 +152,7 @@ func (c *Contract) AddEmittedHash(hashes ...interface{}) {
 	}
 }
 
+// StringifyArg resolves a method argument type to string type
 func StringifyArg(arg interface{}) (str string) {
 	switch arg.(type) {
 	case string:

pkg/contract_watcher/shared/fetcher/fetcher.go

@@ -29,7 +29,7 @@ import (
 // Fetcher serves as the lower level data fetcher that calls the underlying
 // blockchain's FetchConctractData method for a given return type
 
-// Interface definition for a Fetcher
+// FetcherInterface is the interface definition for a fetcher
 type FetcherInterface interface {
 	FetchBigInt(method, contractAbi, contractAddress string, blockNumber int64, methodArgs []interface{}) (big.Int, error)
 	FetchBool(method, contractAbi, contractAddress string, blockNumber int64, methodArgs []interface{}) (bool, error)
@@ -56,14 +56,14 @@ type fetcherError struct {
 	fetchMethod string
 }
 
-// Fetcher error method
+// Error method
 func (fe *fetcherError) Error() string {
 	return fmt.Sprintf("Error fetching %s: %s", fe.fetchMethod, fe.err)
 }
 
 //  Generic Fetcher methods used by Getters to call contract methods
 
-// Method used to fetch big.Int value from contract
+// FetchBigInt is the method used to fetch big.Int value from contract
 func (f Fetcher) FetchBigInt(method, contractAbi, contractAddress string, blockNumber int64, methodArgs []interface{}) (big.Int, error) {
 	var result = new(big.Int)
 	err := f.BlockChain.FetchContractData(contractAbi, contractAddress, method, methodArgs, &result, blockNumber)
@@ -75,7 +75,7 @@ func (f Fetcher) FetchBigInt(method, contractAbi, contractAddress string, blockN
 	return *result, nil
 }
 
-// Method used to fetch bool value from contract
+// FetchBool is the method used to fetch bool value from contract
 func (f Fetcher) FetchBool(method, contractAbi, contractAddress string, blockNumber int64, methodArgs []interface{}) (bool, error) {
 	var result = new(bool)
 	err := f.BlockChain.FetchContractData(contractAbi, contractAddress, method, methodArgs, &result, blockNumber)
@@ -87,7 +87,7 @@ func (f Fetcher) FetchBool(method, contractAbi, contractAddress string, blockNum
 	return *result, nil
 }
 
-// Method used to fetch address value from contract
+// FetchAddress is the method used to fetch address value from contract
 func (f Fetcher) FetchAddress(method, contractAbi, contractAddress string, blockNumber int64, methodArgs []interface{}) (common.Address, error) {
 	var result = new(common.Address)
 	err := f.BlockChain.FetchContractData(contractAbi, contractAddress, method, methodArgs, &result, blockNumber)
@@ -99,7 +99,7 @@ func (f Fetcher) FetchAddress(method, contractAbi, contractAddress string, block
 	return *result, nil
 }
 
-// Method used to fetch string value from contract
+// FetchString is the method used to fetch string value from contract
 func (f Fetcher) FetchString(method, contractAbi, contractAddress string, blockNumber int64, methodArgs []interface{}) (string, error) {
 	var result = new(string)
 	err := f.BlockChain.FetchContractData(contractAbi, contractAddress, method, methodArgs, &result, blockNumber)
@@ -111,7 +111,7 @@ func (f Fetcher) FetchString(method, contractAbi, contractAddress string, blockN
 	return *result, nil
 }
 
-// Method used to fetch hash value from contract
+// FetchHash is the method used to fetch hash value from contract
 func (f Fetcher) FetchHash(method, contractAbi, contractAddress string, blockNumber int64, methodArgs []interface{}) (common.Hash, error) {
 	var result = new(common.Hash)
 	err := f.BlockChain.FetchContractData(contractAbi, contractAddress, method, methodArgs, &result, blockNumber)

pkg/contract_watcher/shared/getter/getter_test.go

@@ -24,10 +24,10 @@ import (
 
 	"github.com/vulcanize/vulcanizedb/pkg/contract_watcher/shared/constants"
 	"github.com/vulcanize/vulcanizedb/pkg/contract_watcher/shared/getter"
-	"github.com/vulcanize/vulcanizedb/pkg/geth"
-	"github.com/vulcanize/vulcanizedb/pkg/geth/client"
-	rpc2 "github.com/vulcanize/vulcanizedb/pkg/geth/converters/rpc"
-	"github.com/vulcanize/vulcanizedb/pkg/geth/node"
+	"github.com/vulcanize/vulcanizedb/pkg/eth"
+	"github.com/vulcanize/vulcanizedb/pkg/eth/client"
+	rpc2 "github.com/vulcanize/vulcanizedb/pkg/eth/converters/rpc"
+	"github.com/vulcanize/vulcanizedb/pkg/eth/node"
 	"github.com/vulcanize/vulcanizedb/test_config"
 )
 
@@ -45,11 +45,12 @@ var _ = Describe("Interface Getter", func() {
 			blockChainClient := client.NewEthClient(ethClient)
 			node := node.MakeNode(rpcClient)
 			transactionConverter := rpc2.NewRpcTransactionConverter(ethClient)
-			blockChain := geth.NewBlockChain(blockChainClient, rpcClient, node, transactionConverter)
+			blockChain := eth.NewBlockChain(blockChainClient, rpcClient, node, transactionConverter)
 			interfaceGetter := getter.NewInterfaceGetter(blockChain)
-			abi := interfaceGetter.GetABI(constants.PublicResolverAddress, blockNumber)
+			abi, err := interfaceGetter.GetABI(constants.PublicResolverAddress, blockNumber)
+			Expect(err).NotTo(HaveOccurred())
 			Expect(abi).To(Equal(expectedABI))
-			_, err = geth.ParseAbi(abi)
+			_, err = eth.ParseAbi(abi)
 			Expect(err).ToNot(HaveOccurred())
 		})
 	})

pkg/contract_watcher/shared/getter/interface_getter.go

@@ -17,13 +17,16 @@
 package getter
 
 import (
+	"fmt"
+
 	"github.com/vulcanize/vulcanizedb/pkg/contract_watcher/shared/constants"
 	"github.com/vulcanize/vulcanizedb/pkg/contract_watcher/shared/fetcher"
 	"github.com/vulcanize/vulcanizedb/pkg/core"
 )
 
+// InterfaceGetter is used to derive the interface of a contract
 type InterfaceGetter interface {
-	GetABI(resolverAddr string, blockNumber int64) string
+	GetABI(resolverAddr string, blockNumber int64) (string, error)
 	GetBlockChain() core.BlockChain
 }
 
@@ -31,7 +34,8 @@ type interfaceGetter struct {
 	fetcher.Fetcher
 }
 
-func NewInterfaceGetter(blockChain core.BlockChain) *interfaceGetter {
+// NewInterfaceGetter returns a new InterfaceGetter
+func NewInterfaceGetter(blockChain core.BlockChain) InterfaceGetter {
 	return &interfaceGetter{
 		Fetcher: fetcher.Fetcher{
 			BlockChain: blockChain,
@@ -39,15 +43,19 @@ func NewInterfaceGetter(blockChain core.BlockChain) *interfaceGetter {
 	}
 }
 
-// Used to construct a custom ABI based on the results from calling supportsInterface
-func (g *interfaceGetter) GetABI(resolverAddr string, blockNumber int64) string {
+// GetABI is used to construct a custom ABI based on the results from calling supportsInterface
+func (g *interfaceGetter) GetABI(resolverAddr string, blockNumber int64) (string, error) {
 	a := constants.SupportsInterfaceABI
 	args := make([]interface{}, 1)
 	args[0] = constants.MetaSig.Bytes()
 	supports, err := g.getSupportsInterface(a, resolverAddr, blockNumber, args)
-	if err != nil || !supports {
-		return ""
+	if err != nil {
+		return "", fmt.Errorf("call to getSupportsInterface failed: %v", err)
 	}
+	if !supports {
+		return "", fmt.Errorf("contract does not support interface")
+	}
+
 	abiStr := `[`
 	args[0] = constants.AddrChangeSig.Bytes()
 	supports, err = g.getSupportsInterface(a, resolverAddr, blockNumber, args)
@@ -91,7 +99,7 @@ func (g *interfaceGetter) GetABI(resolverAddr string, blockNumber int64) string
 	}
 	abiStr = abiStr[:len(abiStr)-1] + `]`
 
-	return abiStr
+	return abiStr, nil
 }
 
 // Use this method to check whether or not a contract supports a given method/event interface
@@ -99,7 +107,7 @@ func (g *interfaceGetter) getSupportsInterface(contractAbi, contractAddress stri
 	return g.Fetcher.FetchBool("supportsInterface", contractAbi, contractAddress, blockNumber, methodArgs)
 }
 
-// Method to retrieve the Getter's blockchain
+// GetBlockChain is a method to retrieve the Getter's blockchain
 func (g *interfaceGetter) GetBlockChain() core.BlockChain {
 	return g.Fetcher.BlockChain
 }

pkg/contract_watcher/shared/helpers/helpers.go

@@ -27,6 +27,7 @@ import (
 	"github.com/vulcanize/vulcanizedb/pkg/core"
 )
 
+// ConvertToLog converts a watched event to a log
 func ConvertToLog(watchedEvent core.WatchedEvent) types.Log {
 	allTopics := []string{watchedEvent.Topic0, watchedEvent.Topic1, watchedEvent.Topic2, watchedEvent.Topic3}
 	var nonNilTopics []string
@@ -56,12 +57,14 @@ func createTopics(topics ...string) []common.Hash {
 	return topicsArray
 }
 
+// BigFromString creates a big.Int from a string
 func BigFromString(n string) *big.Int {
 	b := new(big.Int)
 	b.SetString(n, 10)
 	return b
 }
 
+// GenerateSignature returns the keccak256 hash hex of a string
 func GenerateSignature(s string) string {
 	eventSignature := []byte(s)
 	hash := crypto.Keccak256Hash(eventSignature)

pkg/contract_watcher/shared/helpers/test_helpers/database.go

@@ -30,10 +30,10 @@ import (
 	"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/geth"
-	"github.com/vulcanize/vulcanizedb/pkg/geth/client"
-	rpc2 "github.com/vulcanize/vulcanizedb/pkg/geth/converters/rpc"
-	"github.com/vulcanize/vulcanizedb/pkg/geth/node"
+	"github.com/vulcanize/vulcanizedb/pkg/eth"
+	"github.com/vulcanize/vulcanizedb/pkg/eth/client"
+	rpc2 "github.com/vulcanize/vulcanizedb/pkg/eth/converters/rpc"
+	"github.com/vulcanize/vulcanizedb/pkg/eth/node"
 	"github.com/vulcanize/vulcanizedb/test_config"
 )
 
@@ -117,7 +117,7 @@ func SetupDBandBC() (*postgres.DB, core.BlockChain) {
 	blockChainClient := client.NewEthClient(ethClient)
 	madeNode := node.MakeNode(rpcClient)
 	transactionConverter := rpc2.NewRpcTransactionConverter(ethClient)
-	blockChain := geth.NewBlockChain(blockChainClient, rpcClient, madeNode, transactionConverter)
+	blockChain := eth.NewBlockChain(blockChainClient, rpcClient, madeNode, transactionConverter)
 
 	db, err := postgres.NewDB(config.Database{
 		Hostname: "localhost",
@@ -294,8 +294,7 @@ func TearDown(db *postgres.DB) {
 
 	_, err = tx.Exec(`CREATE TABLE checked_headers (
     	id SERIAL PRIMARY KEY,
-    	header_id INTEGER UNIQUE NOT NULL REFERENCES headers (id) ON DELETE CASCADE,
-    	check_count INTEGER NOT NULL DEFAULT 1);`)
+    	header_id INTEGER UNIQUE NOT NULL REFERENCES headers (id) ON DELETE CASCADE);`)
 	Expect(err).NotTo(HaveOccurred())
 
 	_, err = tx.Exec(`DROP SCHEMA IF EXISTS full_0x8dd5fbce2f6a956c3022ba3663759011dd51e73e CASCADE`)

pkg/contract_watcher/shared/helpers/test_helpers/mocks/parser.go

@@ -20,7 +20,7 @@ import (
 	"github.com/ethereum/go-ethereum/accounts/abi"
 
 	"github.com/vulcanize/vulcanizedb/pkg/contract_watcher/shared/types"
-	"github.com/vulcanize/vulcanizedb/pkg/geth"
+	"github.com/vulcanize/vulcanizedb/pkg/eth"
 )
 
 // Mock parser
@@ -50,7 +50,7 @@ func (p *parser) ParsedAbi() abi.ABI {
 // for the given contract address
 func (p *parser) Parse() error {
 	var err error
-	p.parsedAbi, err = geth.ParseAbi(p.abi)
+	p.parsedAbi, err = eth.ParseAbi(p.abi)
 
 	return err
 }

pkg/contract_watcher/shared/parser/parser.go

@@ -24,7 +24,7 @@ import (
 
 	"github.com/vulcanize/vulcanizedb/pkg/contract_watcher/shared/constants"
 	"github.com/vulcanize/vulcanizedb/pkg/contract_watcher/shared/types"
-	"github.com/vulcanize/vulcanizedb/pkg/geth"
+	"github.com/vulcanize/vulcanizedb/pkg/eth"
 )
 
 // Parser is used to fetch and parse contract ABIs
@@ -40,28 +40,31 @@ type Parser interface {
 }
 
 type parser struct {
-	client    *geth.EtherScanAPI
+	client    *eth.EtherScanAPI
 	abi       string
 	parsedAbi abi.ABI
 }
 
-func NewParser(network string) *parser {
-	url := geth.GenURL(network)
+// NewParser returns a new Parser
+func NewParser(network string) Parser {
+	url := eth.GenURL(network)
 
 	return &parser{
-		client: geth.NewEtherScanClient(url),
+		client: eth.NewEtherScanClient(url),
 	}
 }
 
+// Abi returns the parser's configured abi string
 func (p *parser) Abi() string {
 	return p.abi
 }
 
+// ParsedAbi returns the parser's parsed abi
 func (p *parser) ParsedAbi() abi.ABI {
 	return p.parsedAbi
 }
 
-// Retrieves and parses the abi string
+// Parse retrieves and parses the abi string
 // for the given contract address
 func (p *parser) Parse(contractAddr string) error {
 	// If the abi is one our locally stored abis, fetch
@@ -69,7 +72,7 @@ func (p *parser) Parse(contractAddr string) error {
 	knownAbi, err := p.lookUp(contractAddr)
 	if err == nil {
 		p.abi = knownAbi
-		p.parsedAbi, err = geth.ParseAbi(knownAbi)
+		p.parsedAbi, err = eth.ParseAbi(knownAbi)
 		return err
 	}
 	// Try getting abi from etherscan
@@ -79,29 +82,29 @@ func (p *parser) Parse(contractAddr string) error {
 	}
 	//TODO: Implement other ways to fetch abi
 	p.abi = abiStr
-	p.parsedAbi, err = geth.ParseAbi(abiStr)
+	p.parsedAbi, err = eth.ParseAbi(abiStr)
 
 	return err
 }
 
-// Loads and parses an abi from a given abi string
+// ParseAbiStr loads and parses an abi from a given abi string
 func (p *parser) ParseAbiStr(abiStr string) error {
 	var err error
 	p.abi = abiStr
-	p.parsedAbi, err = geth.ParseAbi(abiStr)
+	p.parsedAbi, err = eth.ParseAbi(abiStr)
 
 	return err
 }
 
 func (p *parser) lookUp(contractAddr string) (string, error) {
-	if v, ok := constants.Abis[common.HexToAddress(contractAddr)]; ok {
+	if v, ok := constants.ABIs[common.HexToAddress(contractAddr)]; ok {
 		return v, nil
 	}
 
 	return "", errors.New("ABI not present in lookup table")
 }
 
-// Returns only specified methods, if they meet the criteria
+// GetSelectMethods returns only specified methods, if they meet the criteria
 // Returns as array with methods in same order they were specified
 // Nil or empty wanted array => no events are returned
 func (p *parser) GetSelectMethods(wanted []string) []types.Method {
@@ -121,7 +124,7 @@ func (p *parser) GetSelectMethods(wanted []string) []types.Method {
 	return methods
 }
 
-// Returns wanted methods
+// GetMethods returns wanted methods
 // Empty wanted array => all methods are returned
 // Nil wanted array => no methods are returned
 func (p *parser) GetMethods(wanted []string) []types.Method {
@@ -139,7 +142,7 @@ func (p *parser) GetMethods(wanted []string) []types.Method {
 	return methods
 }
 
-// Returns wanted events as map of types.Events
+// GetEvents returns wanted events as map of types.Events
 // Empty wanted array => all events are returned
 // Nil wanted array => no events are returned
 func (p *parser) GetEvents(wanted []string) map[string]types.Event {

pkg/contract_watcher/shared/parser/parser_test.go

@@ -25,7 +25,7 @@ import (
 	"github.com/vulcanize/vulcanizedb/pkg/contract_watcher/shared/helpers/test_helpers/mocks"
 	"github.com/vulcanize/vulcanizedb/pkg/contract_watcher/shared/parser"
 	"github.com/vulcanize/vulcanizedb/pkg/contract_watcher/shared/types"
-	"github.com/vulcanize/vulcanizedb/pkg/geth"
+	"github.com/vulcanize/vulcanizedb/pkg/eth"
 )
 
 var _ = Describe("Parser", func() {
@@ -44,7 +44,7 @@ var _ = Describe("Parser", func() {
 			Expect(err).ToNot(HaveOccurred())
 
 			parsedAbi := mp.ParsedAbi()
-			expectedAbi, err := geth.ParseAbi(constants.DaiAbiString)
+			expectedAbi, err := eth.ParseAbi(constants.DaiAbiString)
 			Expect(err).ToNot(HaveOccurred())
 			Expect(parsedAbi).To(Equal(expectedAbi))
 
@@ -73,7 +73,7 @@ var _ = Describe("Parser", func() {
 			expectedAbi := constants.DaiAbiString
 			Expect(p.Abi()).To(Equal(expectedAbi))
 
-			expectedParsedAbi, err := geth.ParseAbi(expectedAbi)
+			expectedParsedAbi, err := eth.ParseAbi(expectedAbi)
 			Expect(err).ToNot(HaveOccurred())
 			Expect(p.ParsedAbi()).To(Equal(expectedParsedAbi))
 		})

pkg/contract_watcher/shared/poller/poller.go

@@ -33,6 +33,7 @@ import (
 	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
 )
 
+// Poller is the interface for polling public contract methods
 type Poller interface {
 	PollContract(con contract.Contract, lastBlock int64) error
 	PollContractAt(con contract.Contract, blockNumber int64) error
@@ -45,13 +46,15 @@ type poller struct {
 	contract contract.Contract
 }
 
-func NewPoller(blockChain core.BlockChain, db *postgres.DB, mode types.Mode) *poller {
+// NewPoller returns a new Poller
+func NewPoller(blockChain core.BlockChain, db *postgres.DB, mode types.Mode) Poller {
 	return &poller{
 		MethodRepository: repository.NewMethodRepository(db, mode),
 		bc:               blockChain,
 	}
 }
 
+// PollContract polls a contract's public methods from the contracts starting block to specified last block
 func (p *poller) PollContract(con contract.Contract, lastBlock int64) error {
 	for i := con.StartingBlock; i <= lastBlock; i++ {
 		if err := p.PollContractAt(con, i); err != nil {
@@ -62,6 +65,7 @@ func (p *poller) PollContract(con contract.Contract, lastBlock int64) error {
 	return nil
 }
 
+// PollContractAt polls a contract's public getter methods at the specified block height
 func (p *poller) PollContractAt(con contract.Contract, blockNumber int64) error {
 	p.contract = con
 	for _, m := range con.Methods {
@@ -98,7 +102,7 @@ func (p *poller) pollNoArgAt(m types.Method, bn int64) error {
 	var out interface{}
 	err := p.bc.FetchContractData(p.contract.Abi, p.contract.Address, m.Name, nil, &out, bn)
 	if err != nil {
-		return errors.New(fmt.Sprintf("poller error calling 0 argument method\r\nblock: %d, method: %s, contract: %s\r\nerr: %v", bn, m.Name, p.contract.Address, err))
+		return fmt.Errorf("poller error calling 0 argument method\r\nblock: %d, method: %s, contract: %s\r\nerr: %v", bn, m.Name, p.contract.Address, err)
 	}
 	strOut, err := stringify(out)
 	if err != nil {
@@ -112,7 +116,7 @@ func (p *poller) pollNoArgAt(m types.Method, bn int64) error {
 	// Persist result immediately
 	err = p.PersistResults([]types.Result{result}, m, p.contract.Address, p.contract.Name)
 	if err != nil {
-		return errors.New(fmt.Sprintf("poller error persisting 0 argument method result\r\nblock: %d, method: %s, contract: %s\r\nerr: %v", bn, m.Name, p.contract.Address, err))
+		return fmt.Errorf("poller error persisting 0 argument method result\r\nblock: %d, method: %s, contract: %s\r\nerr: %v", bn, m.Name, p.contract.Address, err)
 	}
 
 	return nil
@@ -148,7 +152,7 @@ func (p *poller) pollSingleArgAt(m types.Method, bn int64) error {
 		var out interface{}
 		err := p.bc.FetchContractData(p.contract.Abi, p.contract.Address, m.Name, in, &out, bn)
 		if err != nil {
-			return errors.New(fmt.Sprintf("poller error calling 1 argument method\r\nblock: %d, method: %s, contract: %s\r\nerr: %v", bn, m.Name, p.contract.Address, err))
+			return fmt.Errorf("poller error calling 1 argument method\r\nblock: %d, method: %s, contract: %s\r\nerr: %v", bn, m.Name, p.contract.Address, err)
 		}
 		strOut, err := stringify(out)
 		if err != nil {
@@ -164,7 +168,7 @@ func (p *poller) pollSingleArgAt(m types.Method, bn int64) error {
 	// Persist result set as batch
 	err := p.PersistResults(results, m, p.contract.Address, p.contract.Name)
 	if err != nil {
-		return errors.New(fmt.Sprintf("poller error persisting 1 argument method result\r\nblock: %d, method: %s, contract: %s\r\nerr: %v", bn, m.Name, p.contract.Address, err))
+		return fmt.Errorf("poller error persisting 1 argument method result\r\nblock: %d, method: %s, contract: %s\r\nerr: %v", bn, m.Name, p.contract.Address, err)
 	}
 
 	return nil
@@ -212,7 +216,7 @@ func (p *poller) pollDoubleArgAt(m types.Method, bn int64) error {
 			var out interface{}
 			err := p.bc.FetchContractData(p.contract.Abi, p.contract.Address, m.Name, in, &out, bn)
 			if err != nil {
-				return errors.New(fmt.Sprintf("poller error calling 2 argument method\r\nblock: %d, method: %s, contract: %s\r\nerr: %v", bn, m.Name, p.contract.Address, err))
+				return fmt.Errorf("poller error calling 2 argument method\r\nblock: %d, method: %s, contract: %s\r\nerr: %v", bn, m.Name, p.contract.Address, err)
 			}
 			strOut, err := stringify(out)
 			if err != nil {
@@ -228,13 +232,13 @@ func (p *poller) pollDoubleArgAt(m types.Method, bn int64) error {
 
 	err := p.PersistResults(results, m, p.contract.Address, p.contract.Name)
 	if err != nil {
-		return errors.New(fmt.Sprintf("poller error persisting 2 argument method result\r\nblock: %d, method: %s, contract: %s\r\nerr: %v", bn, m.Name, p.contract.Address, err))
+		return fmt.Errorf("poller error persisting 2 argument method result\r\nblock: %d, method: %s, contract: %s\r\nerr: %v", bn, m.Name, p.contract.Address, err)
 	}
 
 	return nil
 }
 
-// This is just a wrapper around the poller blockchain's FetchContractData method
+// FetchContractData is just a wrapper around the poller blockchain's FetchContractData method
 func (p *poller) FetchContractData(contractAbi, contractAddress, method string, methodArgs []interface{}, result interface{}, blockNumber int64) error {
 	return p.bc.FetchContractData(contractAbi, contractAddress, method, methodArgs, result, blockNumber)
 }

pkg/contract_watcher/shared/repository/event_repository.go

@@ -24,7 +24,6 @@ import (
 	"github.com/hashicorp/golang-lru"
 	"github.com/sirupsen/logrus"
 
-	"github.com/vulcanize/vulcanizedb/libraries/shared/repository"
 	"github.com/vulcanize/vulcanizedb/pkg/contract_watcher/shared/types"
 	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
 )
@@ -35,7 +34,7 @@ const (
 	eventCacheSize    = 1000
 )
 
-// Event repository is used to persist event data into custom tables
+// EventRepository is used to persist event data into custom tables
 type EventRepository interface {
 	PersistLogs(logs []types.Log, eventInfo types.Event, contractAddr, contractName string) error
 	CreateEventTable(contractAddr string, event types.Event) (bool, error)
@@ -51,7 +50,8 @@ type eventRepository struct {
 	tables  *lru.Cache // Cache names of recently used tables to minimize db connections
 }
 
-func NewEventRepository(db *postgres.DB, mode types.Mode) *eventRepository {
+// NewEventRepository returns a new EventRepository
+func NewEventRepository(db *postgres.DB, mode types.Mode) EventRepository {
 	ccs, _ := lru.New(contractCacheSize)
 	ecs, _ := lru.New(eventCacheSize)
 	return &eventRepository{
@@ -62,7 +62,7 @@ func NewEventRepository(db *postgres.DB, mode types.Mode) *eventRepository {
 	}
 }
 
-// Creates a schema for the contract if needed
+// PersistLogs creates a schema for the contract if needed
 // Creates table for the watched contract event if needed
 // Persists converted event log data into this custom table
 func (r *eventRepository) PersistLogs(logs []types.Log, eventInfo types.Event, contractAddr, contractName string) error {
@@ -112,7 +112,7 @@ func (r *eventRepository) persistHeaderSyncLogs(logs []types.Log, eventInfo type
 		// Preallocate slice of needed capacity and proceed to pack variables into it in same order they appear in string
 		data := make([]interface{}, 0, 5+el)
 		data = append(data,
-			event.Id,
+			event.ID,
 			contractName,
 			event.Raw,
 			event.LogIndex,
@@ -143,17 +143,6 @@ func (r *eventRepository) persistHeaderSyncLogs(logs []types.Log, eventInfo type
 		}
 	}
 
-	// Mark header as checked for this eventId
-	eventId := strings.ToLower(eventInfo.Name + "_" + contractAddr)
-	markCheckedErr := repository.MarkContractWatcherHeaderCheckedInTransaction(logs[0].Id, tx, eventId) // This assumes all logs are from same block
-	if markCheckedErr != nil {
-		rollbackErr := tx.Rollback()
-		if rollbackErr != nil {
-			logrus.Warnf("error rolling back transaction while marking header checked: %s", rollbackErr.Error())
-		}
-		return fmt.Errorf("error marking header checked: %s", markCheckedErr.Error())
-	}
-
 	return tx.Commit()
 }
 
@@ -171,7 +160,7 @@ func (r *eventRepository) persistFullSyncLogs(logs []types.Log, eventInfo types.
 
 		data := make([]interface{}, 0, 4+el)
 		data = append(data,
-			event.Id,
+			event.ID,
 			contractName,
 			event.Block,
 			event.Tx)
@@ -201,7 +190,7 @@ func (r *eventRepository) persistFullSyncLogs(logs []types.Log, eventInfo types.
 	return tx.Commit()
 }
 
-// Checks for event table and creates it if it does not already exist
+// CreateEventTable checks for event table and creates it if it does not already exist
 // Returns true if it created a new table; returns false if table already existed
 func (r *eventRepository) CreateEventTable(contractAddr string, event types.Event) (bool, error) {
 	tableID := fmt.Sprintf("%s_%s.%s_event", r.mode.String(), strings.ToLower(contractAddr), strings.ToLower(event.Name))
@@ -270,7 +259,7 @@ func (r *eventRepository) checkForTable(contractAddr string, eventName string) (
 	return exists, err
 }
 
-// Checks for contract schema and creates it if it does not already exist
+// CreateContractSchema checks for contract schema and creates it if it does not already exist
 // Returns true if it created a new schema; returns false if schema already existed
 func (r *eventRepository) CreateContractSchema(contractAddr string) (bool, error) {
 	if contractAddr == "" {
@@ -316,10 +305,12 @@ func (r *eventRepository) checkForSchema(contractAddr string) (bool, error) {
 	return exists, err
 }
 
+// CheckSchemaCache is used to query the schema name cache
 func (r *eventRepository) CheckSchemaCache(key string) (interface{}, bool) {
 	return r.schemas.Get(key)
 }
 
+// CheckTableCache is used to query the table name cache
 func (r *eventRepository) CheckTableCache(key string) (interface{}, bool) {
 	return r.tables.Get(key)
 }

pkg/contract_watcher/shared/repository/event_repository_test.go

@@ -355,11 +355,6 @@ var _ = Describe("Repository", func() {
 				Expect(count).To(Equal(2))
 			})
 
-			It("Fails if the persisted event does not have a corresponding eventID column in the checked_headers table", func() {
-				err = dataStore.PersistLogs(logs, event, con.Address, con.Name)
-				Expect(err).To(HaveOccurred())
-			})
-
 			It("Fails with empty log", func() {
 				err = dataStore.PersistLogs([]types.Log{}, event, con.Address, con.Name)
 				Expect(err).To(HaveOccurred())

pkg/contract_watcher/shared/repository/method_repository.go

@@ -30,6 +30,7 @@ import (
 
 const methodCacheSize = 1000
 
+// MethodRepository is used to persist public getter method data
 type MethodRepository interface {
 	PersistResults(results []types.Result, methodInfo types.Method, contractAddr, contractName string) error
 	CreateMethodTable(contractAddr string, method types.Method) (bool, error)
@@ -45,7 +46,8 @@ type methodRepository struct {
 	tables  *lru.Cache // Cache names of recently used tables to minimize db connections
 }
 
-func NewMethodRepository(db *postgres.DB, mode types.Mode) *methodRepository {
+// NewMethodRepository returns a new MethodRepository
+func NewMethodRepository(db *postgres.DB, mode types.Mode) MethodRepository {
 	ccs, _ := lru.New(contractCacheSize)
 	mcs, _ := lru.New(methodCacheSize)
 	return &methodRepository{
@@ -56,7 +58,7 @@ func NewMethodRepository(db *postgres.DB, mode types.Mode) *methodRepository {
 	}
 }
 
-// Creates a schema for the contract if needed
+// PersistResults creates a schema for the contract if needed
 // Creates table for the contract method if needed
 // Persists method polling data into this custom table
 func (r *methodRepository) PersistResults(results []types.Result, methodInfo types.Method, contractAddr, contractName string) error {
@@ -124,7 +126,7 @@ func (r *methodRepository) persistResults(results []types.Result, methodInfo typ
 	return tx.Commit()
 }
 
-// Checks for event table and creates it if it does not already exist
+// CreateMethodTable checks for event table and creates it if it does not already exist
 func (r *methodRepository) CreateMethodTable(contractAddr string, method types.Method) (bool, error) {
 	tableID := fmt.Sprintf("%s_%s.%s_method", r.mode.String(), strings.ToLower(contractAddr), strings.ToLower(method.Name))
 
@@ -177,7 +179,7 @@ func (r *methodRepository) checkForTable(contractAddr string, methodName string)
 	return exists, err
 }
 
-// Checks for contract schema and creates it if it does not already exist
+// CreateContractSchema checks for contract schema and creates it if it does not already exist
 func (r *methodRepository) CreateContractSchema(contractAddr string) (bool, error) {
 	if contractAddr == "" {
 		return false, errors.New("error: no contract address specified")
@@ -222,10 +224,12 @@ func (r *methodRepository) checkForSchema(contractAddr string) (bool, error) {
 	return exists, err
 }
 
+// CheckSchemaCache is used to query the schema name cache
 func (r *methodRepository) CheckSchemaCache(key string) (interface{}, bool) {
 	return r.schemas.Get(key)
 }
 
+// CheckTableCache is used to query the table name cache
 func (r *methodRepository) CheckTableCache(key string) (interface{}, bool) {
 	return r.tables.Get(key)
 }

pkg/contract_watcher/shared/repository/repository_suite_test.go

@@ -17,12 +17,12 @@
 package repository_test
 
 import (
-	"github.com/sirupsen/logrus"
 	"io/ioutil"
 	"testing"
 
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
+	"github.com/sirupsen/logrus"
 )
 
 func TestRepository(t *testing.T) {

pkg/contract_watcher/shared/retriever/address_retriever.go

@@ -18,17 +18,17 @@ package retriever
 
 import (
 	"fmt"
-	"github.com/vulcanize/vulcanizedb/pkg/contract_watcher/shared/types"
 	"strings"
 
 	"github.com/ethereum/go-ethereum/accounts/abi"
 	"github.com/ethereum/go-ethereum/common"
 
 	"github.com/vulcanize/vulcanizedb/pkg/contract_watcher/shared/contract"
+	"github.com/vulcanize/vulcanizedb/pkg/contract_watcher/shared/types"
 	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
 )
 
-// Address retriever is used to retrieve the addresses associated with a contract
+// AddressRetriever is used to retrieve the addresses associated with a contract
 type AddressRetriever interface {
 	RetrieveTokenHolderAddresses(info contract.Contract) (map[common.Address]bool, error)
 }
@@ -38,14 +38,15 @@ type addressRetriever struct {
 	mode types.Mode
 }
 
-func NewAddressRetriever(db *postgres.DB, mode types.Mode) (r *addressRetriever) {
+// NewAddressRetriever returns a new AddressRetriever
+func NewAddressRetriever(db *postgres.DB, mode types.Mode) AddressRetriever {
 	return &addressRetriever{
 		db:   db,
 		mode: mode,
 	}
 }
 
-// Method to retrieve list of token-holding/contract-related addresses by iterating over available events
+// RetrieveTokenHolderAddresses is used to retrieve list of token-holding/contract-related addresses by iterating over available events
 // This generic method should work whether or not the argument/input names of the events meet the expected standard
 // This could be generalized to iterate over ALL events and pull out any address arguments
 func (r *addressRetriever) RetrieveTokenHolderAddresses(info contract.Contract) (map[common.Address]bool, error) {

pkg/contract_watcher/shared/retriever/retriever_suite_test.go

@@ -17,12 +17,12 @@
 package retriever_test
 
 import (
-	"github.com/sirupsen/logrus"
 	"io/ioutil"
 	"testing"
 
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
+	"github.com/sirupsen/logrus"
 )
 
 func TestRetriever(t *testing.T) {

pkg/contract_watcher/shared/types/event.go

@@ -25,20 +25,22 @@ import (
 	"github.com/ethereum/go-ethereum/crypto"
 )
 
+// Event is our custom event type
 type Event struct {
 	Name      string
 	Anonymous bool
 	Fields    []Field
 }
 
+// Field is our custom event field type which associates a postgres type with the field
 type Field struct {
 	abi.Argument        // Name, Type, Indexed
 	PgType       string // Holds type used when committing data held in this field to postgres
 }
 
-// Struct to hold instance of an event log data
+// Log is used to hold instance of an event log data
 type Log struct {
-	Id     int64             // VulcanizeIdLog for full sync and header ID for header sync contract watcher
+	ID     int64             // VulcanizeIdLog for full sync and header ID for header sync contract watcher
 	Values map[string]string // Map of event input names to their values
 
 	// Used for full sync only
@@ -51,7 +53,7 @@ type Log struct {
 	Raw              []byte // json.Unmarshalled byte array of geth/core/types.Log{}
 }
 
-// Unpack abi.Event into our custom Event struct
+// NewEvent unpacks abi.Event into our custom Event struct
 func NewEvent(e abi.Event) Event {
 	fields := make([]Field, len(e.Inputs))
 	for i, input := range e.Inputs {
@@ -85,6 +87,7 @@ func NewEvent(e abi.Event) Event {
 	}
 }
 
+// Sig returns the hash signature for an event
 func (e Event) Sig() common.Hash {
 	types := make([]string, len(e.Fields))
 

pkg/contract_watcher/shared/types/method.go

@@ -25,6 +25,7 @@ import (
 	"github.com/ethereum/go-ethereum/crypto"
 )
 
+// Method is our custom method struct
 type Method struct {
 	Name   string
 	Const  bool
@@ -32,7 +33,7 @@ type Method struct {
 	Return []Field
 }
 
-// Struct to hold instance of result from method call with given inputs and block
+// Result is used to hold instance of result from method call with given inputs and block
 type Result struct {
 	Method
 	Inputs []interface{} // Will only use addresses
@@ -41,7 +42,7 @@ type Result struct {
 	Block  int64
 }
 
-// Unpack abi.Method into our custom Method struct
+// NewMethod unpacks abi.Method into our custom Method struct
 func NewMethod(m abi.Method) Method {
 	inputs := make([]Field, len(m.Inputs))
 	for i, input := range m.Inputs {
@@ -99,6 +100,7 @@ func NewMethod(m abi.Method) Method {
 	}
 }
 
+// Sig returns the hash signature for the method
 func (m Method) Sig() common.Hash {
 	types := make([]string, len(m.Args))
 	i := 0

pkg/contract_watcher/shared/types/mode.go

@@ -16,19 +16,21 @@
 
 package types
 
-import "fmt"
-
+// Mode is used to explicitly represent the operating mode of the transformer
 type Mode int
 
+// Mode enums
 const (
 	HeaderSync Mode = iota
 	FullSync
 )
 
+// IsValid returns true is the Mode is valid
 func (mode Mode) IsValid() bool {
 	return mode >= HeaderSync && mode <= FullSync
 }
 
+// String returns the string representation of the mode
 func (mode Mode) String() string {
 	switch mode {
 	case HeaderSync:
@@ -39,26 +41,3 @@ func (mode Mode) String() string {
 		return "unknown"
 	}
 }
-
-func (mode Mode) MarshalText() ([]byte, error) {
-	switch mode {
-	case HeaderSync:
-		return []byte("header"), nil
-	case FullSync:
-		return []byte("full"), nil
-	default:
-		return nil, fmt.Errorf("contract watcher: unknown mode %d, want HeaderSync or FullSync", mode)
-	}
-}
-
-func (mode *Mode) UnmarshalText(text []byte) error {
-	switch string(text) {
-	case "header":
-		*mode = HeaderSync
-	case "full":
-		*mode = FullSync
-	default:
-		return fmt.Errorf(`contract watcher: unknown mode %q, want "header" or "full"`, text)
-	}
-	return nil
-}

pkg/core/rpc_client.go

@@ -20,7 +20,7 @@ import (
 	"context"
 	"github.com/ethereum/go-ethereum/rpc"
 
-	"github.com/vulcanize/vulcanizedb/pkg/geth/client"
+	"github.com/vulcanize/vulcanizedb/pkg/eth/client"
 )
 
 type RpcClient interface {

pkg/datastore/postgres/repositories/header_repository.go

@@ -41,7 +41,7 @@ func (repository HeaderRepository) CreateOrUpdateHeader(header core.Header) (int
 	hash, err := repository.getHeaderHash(header)
 	if err != nil {
 		if headerDoesNotExist(err) {
-			return repository.insertHeader(header)
+			return repository.InternalInsertHeader(header)
 		}
 		log.Error("CreateOrUpdateHeader: error getting header hash: ", err)
 		return 0, err
@@ -128,13 +128,21 @@ func (repository HeaderRepository) getHeaderHash(header core.Header) (string, er
 	return hash, err
 }
 
-func (repository HeaderRepository) insertHeader(header core.Header) (int64, error) {
+// Function is public so we can test insert being called for the same header
+// Can happen when concurrent processes are inserting headers
+// Otherwise should not occur since only called in CreateOrUpdateHeader
+func (repository HeaderRepository) InternalInsertHeader(header core.Header) (int64, error) {
 	var headerId int64
-	err := repository.database.QueryRowx(
-		`INSERT INTO public.headers (block_number, hash, block_timestamp, raw, eth_node_id, eth_node_fingerprint) VALUES ($1, $2, $3::NUMERIC, $4, $5, $6) RETURNING id`,
-		header.BlockNumber, header.Hash, header.Timestamp, header.Raw, repository.database.NodeID, repository.database.Node.ID).Scan(&headerId)
+	row := repository.database.QueryRowx(
+		`INSERT INTO public.headers (block_number, hash, block_timestamp, raw, eth_node_id, eth_node_fingerprint)
+		VALUES ($1, $2, $3::NUMERIC, $4, $5, $6) ON CONFLICT DO NOTHING RETURNING id`,
+		header.BlockNumber, header.Hash, header.Timestamp, header.Raw, repository.database.NodeID, repository.database.Node.ID)
+	err := row.Scan(&headerId)
 	if err != nil {
-		log.Error("insertHeader: error inserting header: ", err)
+		if err == sql.ErrNoRows {
+			return 0, ErrValidHeaderExists
+		}
+		log.Error("InternalInsertHeader: error inserting header: ", err)
 	}
 	return headerId, err
 }
@@ -146,5 +154,5 @@ func (repository HeaderRepository) replaceHeader(header core.Header) (int64, err
 		log.Error("replaceHeader: error deleting headers: ", err)
 		return 0, err
 	}
-	return repository.insertHeader(header)
+	return repository.InternalInsertHeader(header)
 }

pkg/datastore/postgres/repositories/header_repository_test.go

@@ -98,6 +98,20 @@ var _ = Describe("Block header repository", func() {
 			Expect(len(dbHeaders)).To(Equal(1))
 		})
 
+		It("does not duplicate headers in concurrent insert", func() {
+			_, err = repo.InternalInsertHeader(header)
+			Expect(err).NotTo(HaveOccurred())
+
+			_, err = repo.InternalInsertHeader(header)
+			Expect(err).To(HaveOccurred())
+			Expect(err).To(MatchError(repositories.ErrValidHeaderExists))
+
+			var dbHeaders []core.Header
+			err = db.Select(&dbHeaders, `SELECT block_number, hash, raw FROM public.headers WHERE block_number = $1`, header.BlockNumber)
+			Expect(err).NotTo(HaveOccurred())
+			Expect(len(dbHeaders)).To(Equal(1))
+		})
+
 		It("replaces header if hash is different", func() {
 			_, err = repo.CreateOrUpdateHeader(header)
 			Expect(err).NotTo(HaveOccurred())

pkg/eth/abi.go

@@ -14,7 +14,7 @@
 // You should have received a copy of the GNU Affero General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-package geth
+package eth
 
 import (
 	"errors"

pkg/eth/abi_test.go

@@ -14,7 +14,7 @@
 // You should have received a copy of the GNU Affero General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-package geth_test
+package eth_test
 
 import (
 	"net/http"
@@ -25,7 +25,7 @@ import (
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
 	"github.com/onsi/gomega/ghttp"
-	"github.com/vulcanize/vulcanizedb/pkg/geth"
+	"github.com/vulcanize/vulcanizedb/pkg/eth"
 	"github.com/vulcanize/vulcanizedb/test_config"
 )
 
@@ -36,7 +36,7 @@ var _ = Describe("ABI files", func() {
 		It("loads a valid ABI file", func() {
 			path := test_config.ABIFilePath + "valid_abi.json"
 
-			contractAbi, err := geth.ParseAbiFile(path)
+			contractAbi, err := eth.ParseAbiFile(path)
 
 			Expect(contractAbi).NotTo(BeNil())
 			Expect(err).To(BeNil())
@@ -45,7 +45,7 @@ var _ = Describe("ABI files", func() {
 		It("reads the contents of a valid ABI file", func() {
 			path := test_config.ABIFilePath + "valid_abi.json"
 
-			contractAbi, err := geth.ReadAbiFile(path)
+			contractAbi, err := eth.ReadAbiFile(path)
 
 			Expect(contractAbi).To(Equal("[{\"foo\": \"bar\"}]"))
 			Expect(err).To(BeNil())
@@ -54,38 +54,38 @@ var _ = Describe("ABI files", func() {
 		It("returns an error when the file does not exist", func() {
 			path := test_config.ABIFilePath + "missing_abi.json"
 
-			contractAbi, err := geth.ParseAbiFile(path)
+			contractAbi, err := eth.ParseAbiFile(path)
 
 			Expect(contractAbi).To(Equal(abi.ABI{}))
-			Expect(err).To(Equal(geth.ErrMissingAbiFile))
+			Expect(err).To(Equal(eth.ErrMissingAbiFile))
 		})
 
 		It("returns an error when the file has invalid contents", func() {
 			path := test_config.ABIFilePath + "invalid_abi.json"
 
-			contractAbi, err := geth.ParseAbiFile(path)
+			contractAbi, err := eth.ParseAbiFile(path)
 
 			Expect(contractAbi).To(Equal(abi.ABI{}))
-			Expect(err).To(Equal(geth.ErrInvalidAbiFile))
+			Expect(err).To(Equal(eth.ErrInvalidAbiFile))
 		})
 
 		Describe("Request ABI from endpoint", func() {
 
 			var (
 				server    *ghttp.Server
-				client    *geth.EtherScanAPI
+				client    *eth.EtherScanAPI
 				abiString string
 				err       error
 			)
 
 			BeforeEach(func() {
 				server = ghttp.NewServer()
-				client = geth.NewEtherScanClient(server.URL())
+				client = eth.NewEtherScanClient(server.URL())
 				path := test_config.ABIFilePath + "sample_abi.json"
-				abiString, err = geth.ReadAbiFile(path)
+				abiString, err = eth.ReadAbiFile(path)
 
 				Expect(err).NotTo(HaveOccurred())
-				_, err = geth.ParseAbi(abiString)
+				_, err = eth.ParseAbi(abiString)
 				Expect(err).NotTo(HaveOccurred())
 			})
 
@@ -117,14 +117,14 @@ var _ = Describe("ABI files", func() {
 
 		Describe("Generating etherscan endpoints based on network", func() {
 			It("should return the main endpoint as the default", func() {
-				url := geth.GenURL("")
+				url := eth.GenURL("")
 				Expect(url).To(Equal("https://api.etherscan.io"))
 			})
 
 			It("generates various test network endpoint if test network is supplied", func() {
-				ropstenUrl := geth.GenURL("ropsten")
-				rinkebyUrl := geth.GenURL("rinkeby")
-				kovanUrl := geth.GenURL("kovan")
+				ropstenUrl := eth.GenURL("ropsten")
+				rinkebyUrl := eth.GenURL("rinkeby")
+				kovanUrl := eth.GenURL("kovan")
 
 				Expect(ropstenUrl).To(Equal("https://ropsten.etherscan.io"))
 				Expect(kovanUrl).To(Equal("https://kovan.etherscan.io"))

pkg/eth/blockchain.go

@@ -14,7 +14,7 @@
 // You should have received a copy of the GNU Affero General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-package geth
+package eth
 
 import (
 	"errors"
@@ -28,8 +28,8 @@ import (
 	"golang.org/x/net/context"
 
 	"github.com/vulcanize/vulcanizedb/pkg/core"
-	"github.com/vulcanize/vulcanizedb/pkg/geth/client"
-	vulcCommon "github.com/vulcanize/vulcanizedb/pkg/geth/converters/common"
+	"github.com/vulcanize/vulcanizedb/pkg/eth/client"
+	vulcCommon "github.com/vulcanize/vulcanizedb/pkg/eth/converters/common"
 )
 
 var ErrEmptyHeader = errors.New("empty header returned over RPC")

pkg/eth/blockchain_test.go

@@ -14,7 +14,7 @@
 // You should have received a copy of the GNU Affero General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-package geth_test
+package eth_test
 
 import (
 	"context"
@@ -29,14 +29,14 @@ import (
 	. "github.com/onsi/gomega"
 
 	vulcCore "github.com/vulcanize/vulcanizedb/pkg/core"
+	"github.com/vulcanize/vulcanizedb/pkg/eth"
 	"github.com/vulcanize/vulcanizedb/pkg/fakes"
-	"github.com/vulcanize/vulcanizedb/pkg/geth"
 )
 
 var _ = Describe("Geth blockchain", func() {
 	var (
 		mockClient               *fakes.MockEthClient
-		blockChain               *geth.BlockChain
+		blockChain               *eth.BlockChain
 		mockRpcClient            *fakes.MockRpcClient
 		mockTransactionConverter *fakes.MockTransactionConverter
 		node                     vulcCore.Node
@@ -47,7 +47,7 @@ var _ = Describe("Geth blockchain", func() {
 		mockRpcClient = fakes.NewMockRpcClient()
 		mockTransactionConverter = fakes.NewMockTransactionConverter()
 		node = vulcCore.Node{}
-		blockChain = geth.NewBlockChain(mockClient, mockRpcClient, node, mockTransactionConverter)
+		blockChain = eth.NewBlockChain(mockClient, mockRpcClient, node, mockTransactionConverter)
 	})
 
 	Describe("getting a block", func() {
@@ -105,7 +105,7 @@ var _ = Describe("Geth blockchain", func() {
 				node.NetworkID = vulcCore.KOVAN_NETWORK_ID
 				blockNumber := hexutil.Big(*big.NewInt(100))
 				mockRpcClient.SetReturnPOAHeader(vulcCore.POAHeader{Number: &blockNumber})
-				blockChain = geth.NewBlockChain(mockClient, mockRpcClient, node, fakes.NewMockTransactionConverter())
+				blockChain = eth.NewBlockChain(mockClient, mockRpcClient, node, fakes.NewMockTransactionConverter())
 
 				_, err := blockChain.GetHeaderByNumber(100)
 
@@ -116,7 +116,7 @@ var _ = Describe("Geth blockchain", func() {
 			It("returns err if rpcClient returns err", func() {
 				node.NetworkID = vulcCore.KOVAN_NETWORK_ID
 				mockRpcClient.SetCallContextErr(fakes.FakeError)
-				blockChain = geth.NewBlockChain(mockClient, mockRpcClient, node, fakes.NewMockTransactionConverter())
+				blockChain = eth.NewBlockChain(mockClient, mockRpcClient, node, fakes.NewMockTransactionConverter())
 
 				_, err := blockChain.GetHeaderByNumber(100)
 
@@ -126,12 +126,12 @@ var _ = Describe("Geth blockchain", func() {
 
 			It("returns error if returned header is empty", func() {
 				node.NetworkID = vulcCore.KOVAN_NETWORK_ID
-				blockChain = geth.NewBlockChain(mockClient, mockRpcClient, node, fakes.NewMockTransactionConverter())
+				blockChain = eth.NewBlockChain(mockClient, mockRpcClient, node, fakes.NewMockTransactionConverter())
 
 				_, err := blockChain.GetHeaderByNumber(100)
 
 				Expect(err).To(HaveOccurred())
-				Expect(err).To(MatchError(geth.ErrEmptyHeader))
+				Expect(err).To(MatchError(eth.ErrEmptyHeader))
 			})
 
 			It("returns multiple headers with multiple blocknumbers", func() {

pkg/eth/cold_import/importer.go

@@ -19,7 +19,7 @@ package cold_import
 import (
 	"github.com/vulcanize/vulcanizedb/pkg/datastore"
 	"github.com/vulcanize/vulcanizedb/pkg/datastore/ethereum"
-	"github.com/vulcanize/vulcanizedb/pkg/geth/converters/common"
+	"github.com/vulcanize/vulcanizedb/pkg/eth/converters/common"
 )
 
 type ColdImporter struct {

pkg/eth/cold_import/importer_test.go

@@ -21,9 +21,9 @@ import (
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
 	"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres/repositories"
+	"github.com/vulcanize/vulcanizedb/pkg/eth/cold_import"
+	vulcCommon "github.com/vulcanize/vulcanizedb/pkg/eth/converters/common"
 	"github.com/vulcanize/vulcanizedb/pkg/fakes"
-	"github.com/vulcanize/vulcanizedb/pkg/geth/cold_import"
-	vulcCommon "github.com/vulcanize/vulcanizedb/pkg/geth/converters/common"
 )
 
 var _ = Describe("Geth cold importer", func() {

pkg/eth/cold_import/node_builder_test.go

@@ -21,8 +21,8 @@ import (
 	"github.com/ethereum/go-ethereum/common"
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
+	"github.com/vulcanize/vulcanizedb/pkg/eth/cold_import"
 	"github.com/vulcanize/vulcanizedb/pkg/fakes"
-	"github.com/vulcanize/vulcanizedb/pkg/geth/cold_import"
 )
 
 var _ = Describe("Cold importer node builder", func() {

pkg/eth/contract.go

@@ -14,7 +14,7 @@
 // You should have received a copy of the GNU Affero General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-package geth
+package eth
 
 import (
 	"context"

pkg/eth/converters/common/block_converter_test.go

@@ -29,9 +29,9 @@ import (
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
 
+	vulcCommon "github.com/vulcanize/vulcanizedb/pkg/eth/converters/common"
+	"github.com/vulcanize/vulcanizedb/pkg/eth/converters/rpc"
 	"github.com/vulcanize/vulcanizedb/pkg/fakes"
-	vulcCommon "github.com/vulcanize/vulcanizedb/pkg/geth/converters/common"
-	"github.com/vulcanize/vulcanizedb/pkg/geth/converters/rpc"
 )
 
 var _ = Describe("Conversion of GethBlock to core.Block", func() {

pkg/eth/converters/common/full_sync_log_converter_test.go

@@ -26,7 +26,7 @@ import (
 	. "github.com/onsi/gomega"
 
 	"github.com/vulcanize/vulcanizedb/pkg/core"
-	vulcCommon "github.com/vulcanize/vulcanizedb/pkg/geth/converters/common"
+	vulcCommon "github.com/vulcanize/vulcanizedb/pkg/eth/converters/common"
 )
 
 var _ = Describe("Conversion of GethLog to core.FullSyncLog", func() {

pkg/eth/converters/common/header_converter_test.go

@@ -26,8 +26,8 @@ import (
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
 
+	common2 "github.com/vulcanize/vulcanizedb/pkg/eth/converters/common"
 	"github.com/vulcanize/vulcanizedb/pkg/fakes"
-	common2 "github.com/vulcanize/vulcanizedb/pkg/geth/converters/common"
 )
 
 var _ = Describe("Block header converter", func() {

pkg/eth/converters/common/receipt_converter_test.go

@@ -25,7 +25,7 @@ import (
 	. "github.com/onsi/gomega"
 
 	"github.com/vulcanize/vulcanizedb/pkg/core"
-	vulcCommon "github.com/vulcanize/vulcanizedb/pkg/geth/converters/common"
+	vulcCommon "github.com/vulcanize/vulcanizedb/pkg/eth/converters/common"
 )
 
 var _ = Describe("Conversion of GethReceipt to core.Receipt", func() {