Remove pubsub and replace w/ polling head of chain (#122)

* Rename geth package structs to not be prefaced with package name

* No longer need to dump schema since Travis uses migrate

* Rearrange history package

* Removed double request for receipt from block rewards

* Remove Listener + Observers and Replace w/ Polling Head

* Potential Short term Issue w/ Infura (ignore these tests for now)

integration_test/geth_blockchain_test.go

@@ -4,11 +4,10 @@ import (
 	"io/ioutil"
 	"log"
 
-	"github.com/8thlight/vulcanizedb/pkg/blockchain_listener"
 	"github.com/8thlight/vulcanizedb/pkg/config"
-	"github.com/8thlight/vulcanizedb/pkg/core"
-	"github.com/8thlight/vulcanizedb/pkg/fakes"
 	"github.com/8thlight/vulcanizedb/pkg/geth"
+	"github.com/8thlight/vulcanizedb/pkg/history"
+	"github.com/8thlight/vulcanizedb/pkg/repositories"
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
 )
@@ -19,35 +18,19 @@ func init() {
 
 var _ = Describe("Reading from the Geth blockchain", func() {
 
-	var listener blockchain_listener.BlockchainListener
-	var observer *fakes.BlockchainObserver
-	var blockchain *geth.GethBlockchain
+	var blockchain *geth.Blockchain
+	var repository *repositories.InMemory
 
 	BeforeEach(func() {
-		observer = fakes.NewFakeBlockchainObserver()
 		cfg, _ := config.NewConfig("private")
-		blockchain = geth.NewGethBlockchain(cfg.Client.IPCPath)
-		observers := []core.BlockchainObserver{observer}
-		listener = blockchain_listener.NewBlockchainListener(blockchain, observers)
-	})
-
-	AfterEach(func() {
-		listener.Stop()
+		blockchain = geth.NewBlockchain(cfg.Client.IPCPath)
+		repository = repositories.NewInMemory()
 	})
 
 	It("reads two blocks", func(done Done) {
-		go listener.Start()
-
-		<-observer.WasNotified
-		firstBlock := observer.LastBlock()
-		Expect(firstBlock).NotTo(BeNil())
-
-		<-observer.WasNotified
-		secondBlock := observer.LastBlock()
-		Expect(secondBlock).NotTo(BeNil())
-
-		Expect(firstBlock.Number + 1).Should(Equal(secondBlock.Number))
-
+		validator := history.NewBlockValidator(blockchain, repository, 2)
+		validator.ValidateBlocks()
+		Expect(repository.BlockCount()).To(Equal(2))
 		close(done)
 	}, 15)