From c5e323b25cc1547b7da457769f9445e7228a105c Mon Sep 17 00:00:00 2001
From: Minh Doan <40258599+mikedoan@users.noreply.github.com>
Date: Sun, 29 Mar 2020 13:20:24 -0700
Subject: [PATCH] add lock to protection storage dump (#2624)

---
 api/service/explorer/storage.go | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/api/service/explorer/storage.go b/api/service/explorer/storage.go
index 325802c19..a8fb9eea3 100644
--- a/api/service/explorer/storage.go
+++ b/api/service/explorer/storage.go
@@ -30,7 +30,8 @@ var once sync.Once
 
 // Storage dump the block info into leveldb.
 type Storage struct {
-	db *leveldb.DB
+	db   *leveldb.DB
+	lock sync.Mutex
 }
 
 // GetStorageInstance returns attack model by using singleton pattern.
@@ -72,6 +73,8 @@ func (storage *Storage) GetDB() *leveldb.DB {
 
 // Dump extracts information from block and index them into lvdb for explorer.
 func (storage *Storage) Dump(block *types.Block, height uint64) {
+	storage.lock.Lock()
+	defer storage.lock.Unlock()
 	if block == nil {
 		return
 	}