Nest packages under pkg

pkg/observers/blockchain_db_observer.go

@@ -0,0 +1,18 @@
+package observers
+
+import (
+	"github.com/8thlight/vulcanizedb/pkg/core"
+	"github.com/8thlight/vulcanizedb/pkg/repositories"
+)
+
+type BlockchainDbObserver struct {
+	repository repositories.Repository
+}
+
+func NewBlockchainDbObserver(repository repositories.Repository) BlockchainDbObserver {
+	return BlockchainDbObserver{repository: repository}
+}
+
+func (observer BlockchainDbObserver) NotifyBlockAdded(block core.Block) {
+	observer.repository.CreateBlock(block)
+}

pkg/observers/blockchain_db_observer_test.go

@@ -0,0 +1,38 @@
+package observers_test
+
+import (
+	"github.com/8thlight/vulcanizedb/pkg/core"
+	"github.com/8thlight/vulcanizedb/pkg/observers"
+	"github.com/8thlight/vulcanizedb/pkg/repositories"
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+)
+
+var _ = Describe("Saving blocks to the database", func() {
+
+	var repository *repositories.InMemory
+
+	BeforeEach(func() {
+		repository = repositories.NewInMemory()
+	})
+
+	It("implements the observer interface", func() {
+		var observer core.BlockchainObserver = observers.NewBlockchainDbObserver(repository)
+		Expect(observer).NotTo(BeNil())
+	})
+
+	It("saves a block with one transaction", func() {
+		block := core.Block{
+			Number:       123,
+			Transactions: []core.Transaction{{}},
+		}
+
+		observer := observers.NewBlockchainDbObserver(repository)
+		observer.NotifyBlockAdded(block)
+
+		savedBlock := repository.FindBlockByNumber(123)
+		Expect(savedBlock).NotTo(BeNil())
+		Expect(len(savedBlock.Transactions)).To(Equal(1))
+	})
+
+})

pkg/observers/blockchain_logging_observer.go

@@ -0,0 +1,18 @@
+package observers
+
+import (
+	"fmt"
+	"time"
+
+	"github.com/8thlight/vulcanizedb/pkg/core"
+)
+
+type BlockchainLoggingObserver struct{}
+
+func (blockchainObserver BlockchainLoggingObserver) NotifyBlockAdded(block core.Block) {
+	fmt.Printf("New block was added: %d\n"+
+		"\tTime: %v\n"+
+		"\tGas Limit: %d\n"+
+		"\tGas Used: %d\n"+
+		"\tNumber of Transactions %d\n", block.Number, time.Unix(block.Time, 0), block.GasLimit, block.GasUsed, len(block.Transactions))
+}

pkg/observers/observers_suite_test.go

@@ -0,0 +1,13 @@
+package observers_test
+
+import (
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+
+	"testing"
+)
+
+func TestObservers(t *testing.T) {
+	RegisterFailHandler(Fail)
+	RunSpecs(t, "Observers Suite")
+}