Handle events

- Adds interfaces for developers to build handlers that update data in
response to log events
- Resolves #29

pkg/contract_summary/console_presenter.go

@@ -30,11 +30,10 @@ func template() string {
 func transactionToString(transaction *core.Transaction) string {
 	if transaction == nil {
 		return "NONE"
-	} else {
-		return fmt.Sprintf(`Hash: %s
+	}
+	return fmt.Sprintf(`Hash: %s
                               To: %s
                             From: %s`, transaction.Hash, transaction.To, transaction.From)
-	}
 }
 
 func attributesString(summary ContractSummary) string {

pkg/contract_summary/summary.go

@@ -4,7 +4,7 @@ import (
 	"math/big"
 
 	"github.com/vulcanize/vulcanizedb/pkg/core"
-	"github.com/vulcanize/vulcanizedb/pkg/repositories"
+	"github.com/vulcanize/vulcanizedb/pkg/datastore"
 )
 
 type ContractSummary struct {
@@ -17,13 +17,12 @@ type ContractSummary struct {
 	blockChain           core.Blockchain
 }
 
-func NewSummary(blockchain core.Blockchain, contractRepository repositories.ContractRepository, contractHash string, blockNumber *big.Int) (ContractSummary, error) {
+func NewSummary(blockchain core.Blockchain, contractRepository datastore.ContractRepository, contractHash string, blockNumber *big.Int) (ContractSummary, error) {
 	contract, err := contractRepository.GetContract(contractHash)
 	if err != nil {
 		return ContractSummary{}, err
-	} else {
-		return newContractSummary(blockchain, contract, blockNumber), nil
 	}
+	return newContractSummary(blockchain, contract, blockNumber), nil
 }
 
 func (contractSummary ContractSummary) GetStateAttribute(attributeName string) interface{} {
@@ -48,7 +47,6 @@ func newContractSummary(blockchain core.Blockchain, contract core.Contract, bloc
 func lastTransaction(contract core.Contract) *core.Transaction {
 	if len(contract.Transactions) > 0 {
 		return &contract.Transactions[0]
-	} else {
-		return nil
 	}
+	return nil
 }

pkg/contract_summary/summary_test.go

@@ -7,12 +7,12 @@ import (
 	. "github.com/onsi/gomega"
 	"github.com/vulcanize/vulcanizedb/pkg/contract_summary"
 	"github.com/vulcanize/vulcanizedb/pkg/core"
+	"github.com/vulcanize/vulcanizedb/pkg/datastore"
+	"github.com/vulcanize/vulcanizedb/pkg/datastore/inmemory"
 	"github.com/vulcanize/vulcanizedb/pkg/fakes"
-	"github.com/vulcanize/vulcanizedb/pkg/repositories"
-	"github.com/vulcanize/vulcanizedb/pkg/repositories/inmemory"
 )
 
-func NewCurrentContractSummary(blockchain core.Blockchain, contractRepository repositories.ContractRepository, contractHash string) (contract_summary.ContractSummary, error) {
+func NewCurrentContractSummary(blockchain core.Blockchain, contractRepository datastore.ContractRepository, contractHash string) (contract_summary.ContractSummary, error) {
 	return contract_summary.NewSummary(blockchain, contractRepository, contractHash, nil)
 }
 
@@ -143,6 +143,7 @@ var _ = Describe("The contract summary", func() {
 				},
 			))
 		})
+
 	})
 
 })