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)

cmd/run/main.go

@@ -1,30 +1,34 @@
 package main
 
 import (
-	"fmt"
-
 	"flag"
 
+	"time"
+
+	"os"
+
 	"github.com/8thlight/vulcanizedb/cmd"
-	"github.com/8thlight/vulcanizedb/pkg/blockchain_listener"
-	"github.com/8thlight/vulcanizedb/pkg/core"
 	"github.com/8thlight/vulcanizedb/pkg/geth"
-	"github.com/8thlight/vulcanizedb/pkg/observers"
+	"github.com/8thlight/vulcanizedb/pkg/history"
+)
+
+const (
+	pollingInterval = 7 * time.Second
 )
 
 func main() {
+	ticker := time.NewTicker(pollingInterval)
+	defer ticker.Stop()
+
 	environment := flag.String("environment", "", "Environment name")
 	flag.Parse()
 	config := cmd.LoadConfig(*environment)
-	fmt.Printf("Creating Geth Blockchain to: %s\n", config.Client.IPCPath)
-	blockchain := geth.NewGethBlockchain(config.Client.IPCPath)
+	blockchain := geth.NewBlockchain(config.Client.IPCPath)
 	repository := cmd.LoadPostgres(config.Database, blockchain.Node())
-	listener := blockchain_listener.NewBlockchainListener(
-		blockchain,
-		[]core.BlockchainObserver{
-			observers.BlockchainLoggingObserver{},
-			observers.NewBlockchainDbObserver(repository),
-		},
-	)
-	listener.Start()
+	validator := history.NewBlockValidator(blockchain, repository, 15)
+
+	for range ticker.C {
+		window := validator.ValidateBlocks()
+		validator.Log(os.Stdout, window)
+	}
 }