fix missing root node edge case and use nil snapshot to work with 1.9.15

cmd/root.go

@@ -90,6 +90,7 @@ func init() {
 	rootCmd.PersistentFlags().String("database-hostname", "localhost", "database hostname")
 	rootCmd.PersistentFlags().String("database-user", "", "database user")
 	rootCmd.PersistentFlags().String("database-password", "", "database password")
+	rootCmd.PersistentFlags().String("log-level", logrus.InfoLevel.String(), "Log level (trace, debug, info, warn, error, fatal, panic")
 
 	viper.BindPFlag("logfile", rootCmd.PersistentFlags().Lookup("logfile"))
 	viper.BindPFlag("database.name", rootCmd.PersistentFlags().Lookup("database-name"))
@@ -97,4 +98,5 @@ func init() {
 	viper.BindPFlag("database.hostname", rootCmd.PersistentFlags().Lookup("database-hostname"))
 	viper.BindPFlag("database.user", rootCmd.PersistentFlags().Lookup("database-user"))
 	viper.BindPFlag("database.password", rootCmd.PersistentFlags().Lookup("database-password"))
+	viper.BindPFlag("log.level", rootCmd.PersistentFlags().Lookup("log-level"))
 }

environments/example.toml

@@ -0,0 +1,6 @@
+[database]
+    name     = "vulcanize_public" # $DATABASE_NAME
+    hostname = "localhost" # $DATABASE_HOSTNAME
+    port     = 5432 # $DATABASE_PORT
+    user     = "postgres" # $DATABASE_USER
+    password = "" # $DATABASE_PASSWORD

environments/testing.toml

@@ -0,0 +1,4 @@
+[database]
+  name     = "vulcanize_testing"
+  hostname = "localhost"
+  port     = 5432

pkg/validator.go

@@ -17,9 +17,10 @@
 package validator
 
 import (
+	"fmt"
+
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core/state"
-	"github.com/ethereum/go-ethereum/core/state/snapshot"
 	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/ethdb"
 	"github.com/ethereum/go-ethereum/trie"
@@ -52,12 +53,20 @@ func NewValidator(db *sqlx.DB) *Validator {
 // This does consider child storage tries
 func (v *Validator) ValidateTrie(stateRoot common.Hash) error {
 	// Generate the state.NodeIterator for this root
-	snapshotTree := snapshot.New(v.kvs, v.trieDB, 0, stateRoot, false)
+	stateDB, err := state.New(common.Hash{}, v.stateDatabase, nil)
-	stateDB, err := state.New(common.Hash{}, v.stateDatabase, snapshotTree)
 	if err != nil {
 		return err
 	}
 	it := state.NewNodeIterator(stateDB)
+	// state.NodeIterator won't throw an error if we can't find the root node
+	// check if it exists first
+	exists, err := v.kvs.Has(stateRoot.Bytes())
+	if err != nil {
+		return err
+	}
+	if !exists {
+		return fmt.Errorf("root node for hash %s does not exist in database", stateRoot.Hex())
+	}
 	for it.Next() {
 		// iterate through entire state trie and descendent storage tries
 		// it.Next() will return false when we have either completed iteration of the entire trie or have ran into an error (e.g. a missing node)