Canonical blocks (#108)

* Update Block w/ newest Block

* Add cascading delete to blocks and transactions tables

* Add handling for new conflicting blocks

* Command line version of sliding window n behind HEAD

cmd/populate_blocks/main.go

@@ -17,6 +17,6 @@ func main() {
 	config := cmd.LoadConfig(*environment)
 	blockchain := geth.NewGethBlockchain(config.Client.IPCPath)
 	repository := cmd.LoadPostgres(config.Database, blockchain.Node())
-	numberOfBlocksCreated := history.PopulateBlocks(blockchain, repository, int64(*startingBlockNumber))
+	numberOfBlocksCreated := history.PopulateMissingBlocks(blockchain, repository, int64(*startingBlockNumber))
 	fmt.Printf("Populated %d blocks", numberOfBlocksCreated)
 }

cmd/update_canonical/main.go

@@ -0,0 +1,47 @@
+package main
+
+import (
+	"flag"
+
+	"time"
+
+	"os"
+	"text/template"
+
+	"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/history"
+	"github.com/8thlight/vulcanizedb/pkg/observers"
+)
+
+const windowTemplate = `Validating Existing Blocks
+|{{.LowerBound}}|-- Validation Window --|{{.UpperBound}}| {{.MaxBlockNumber}}(HEAD)
+
+`
+
+func main() {
+	environment := flag.String("environment", "", "Environment name")
+	flag.Parse()
+	config := cmd.LoadConfig(*environment)
+	blockchain := geth.NewGethBlockchain(config.Client.IPCPath)
+	repository := cmd.LoadPostgres(config.Database, blockchain.Node())
+	listener := blockchain_listener.NewBlockchainListener(
+		blockchain,
+		[]core.BlockchainObserver{
+			observers.BlockchainLoggingObserver{},
+			observers.NewBlockchainDbObserver(repository),
+		},
+	)
+	go listener.Start()
+
+	windowSize := 10
+	ticker := time.NewTicker(10 * time.Second)
+	t := template.Must(template.New("window").Parse(windowTemplate))
+	for _ = range ticker.C {
+		window := history.UpdateBlocksWindow(blockchain, repository, windowSize)
+		t.Execute(os.Stdout, window)
+	}
+	ticker.Stop()
+}