VDB-919 Generalise converter (#152)

* Generalise transformer stack to use InsertionModel

* Add tests for event repository

* Restrict accepted values in InsertionModel

* Add call to repository.SetDB

* Improve error propagation/clarity on GetABI()

* Remove maker references in example

* Please golint

* refactor rollback error handling in repository

* Cleaner errors in repository, refactor tests

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")
+}