From 8b2ad71c29f83566c340740f715cef888cbe8d97 Mon Sep 17 00:00:00 2001
From: Wei-Ning Huang <w@dexon.org>
Date: Wed, 28 Nov 2018 17:21:26 +0800
Subject: core: panic if fork found when inserting header chain (#61)

---
 core/blockchain.go | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/core/blockchain.go b/core/blockchain.go
index 2b172b15c..625bf7e3a 100644
--- a/core/blockchain.go
+++ b/core/blockchain.go
@@ -2238,7 +2238,12 @@ func (bc *BlockChain) InsertDexonHeaderChain(chain []*types.HeaderWithGovState,
 	whFunc := func(header *types.HeaderWithGovState) error {
 		bc.mu.Lock()
 		defer bc.mu.Unlock()
-		_, err := bc.hc.WriteDexonHeader(header)
+		status, err := bc.hc.WriteDexonHeader(header)
+		if status == SideStatTy {
+			log.Debug("Inserted forked block header", "number", header.Number, "hash", header.Hash, "diff", header.Difficulty,
+				"gas", header.GasUsed)
+			panic("fork found")
+		}
 		return err
 	}
 
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