Add log for ungraceful shutdown on startup (#2215)

Signed-off-by: Joshua Kim <20001595+joshua-kim@users.noreply.github.com>

Author: joshua-kim

node/node.go

@@ -89,7 +89,9 @@ import (
 )
 
 var (
-	genesisHashKey  = []byte("genesisID")
+	genesisHashKey     = []byte("genesisID")
+	ungracefulShutdown = []byte("ungracefulShutdown")
+
 	indexerDBPrefix = []byte{0x00}
 
 	errInvalidTLSKey = errors.New("invalid TLS key")
@@ -556,6 +558,23 @@ func (n *Node) initDatabase() error {
 	if genesisHash != expectedGenesisHash {
 		return fmt.Errorf("db contains invalid genesis hash. DB Genesis: %s Generated Genesis: %s", genesisHash, expectedGenesisHash)
 	}
+
+	ok, err := n.DB.Has(ungracefulShutdown)
+	if err != nil {
+		return fmt.Errorf("failed to read ungraceful shutdown key: %w", err)
+	}
+
+	if ok {
+		n.Log.Warn("detected previous ungraceful shutdown")
+	}
+
+	if err := n.DB.Put(ungracefulShutdown, nil); err != nil {
+		return fmt.Errorf(
+			"failed to write ungraceful shutdown key at: %w",
+			err,
+		)
+	}
+
 	return nil
 }
 
@@ -1530,6 +1549,13 @@ func (n *Node) shutdown() {
 	n.runtimeManager.Stop(context.TODO())
 
 	if n.DBManager != nil {
+		if err := n.DB.Delete(ungracefulShutdown); err != nil {
+			n.Log.Error(
+				"failed to delete ungraceful shutdown key",
+				zap.Error(err),
+			)
+		}
+
 		if err := n.DBManager.Close(); err != nil {
 			n.Log.Warn("error during DB shutdown",
 				zap.Error(err),