Work around for the issue "return wrong list signers from snapshot"

Update signers in snapshot
Ignore signerCheck at checkpoint block 27307800
due to wrong snapshot at gap 27307799

common/constants.go

@@ -23,6 +23,7 @@ const (
 	MergeSignRange             = 15
 	RangeReturnSigner          = 150
 	MinimunMinerBlockPerEpoch  = 1
+	IgnoreSignerCheckBlock     = uint64(27307800)
 )
 
 var TIP2019Block = big.NewInt(1)

consensus/XDPoS/XDPoS.go

@@ -417,20 +417,11 @@ func (c *XDPoS) verifyCascadingFields(chain consensus.ChainReader, header *types
 	if err == nil {
 		return c.verifySeal(chain, header, parents, fullVerify)
 	}
-
+	signers, err = c.GetSignersFromContract(chain, header)
-	// try again the progress with signers querying from smart contract
-	// for example the checkpoint is 886500 -> the start gap block is 886495
-	startGapBlockHeader := header
-	for step := uint64(1); step <= chain.Config().XDPoS.Gap; step++ {
-		startGapBlockHeader = chain.GetHeader(startGapBlockHeader.ParentHash, number-step)
-	}
-	signers, err = c.HookGetSignersFromContract(startGapBlockHeader.Hash())
 	if err != nil {
-		log.Debug("Can't get signers from Smart Contract ", err)
 		return err
 	}
 
-	err = c.checkSignersOnCheckpoint(chain, header, signers)
 	if err == nil {
 		return c.verifySeal(chain, header, parents, fullVerify)
 	}
@@ -440,6 +431,10 @@ func (c *XDPoS) verifyCascadingFields(chain consensus.ChainReader, header *types
 
 func (c *XDPoS) checkSignersOnCheckpoint(chain consensus.ChainReader, header *types.Header, signers []common.Address) error {
 	number := header.Number.Uint64()
+	// ignore signerCheck at checkpoint block 27307800 due to wrong snapshot at gap 27307799
+	if number == common.IgnoreSignerCheckBlock {
+		return nil
+	}
 	penPenalties := []common.Address{}
 	if c.HookPenalty != nil || c.HookPenaltyTIPSigning != nil {
 		var err error
@@ -1281,3 +1276,16 @@ func (c *XDPoS) CheckMNTurn(chain consensus.ChainReader, parent *types.Header, s
 	}
 	return false
 }
+
+func (c *XDPoS) GetSignersFromContract(chain consensus.ChainReader, checkpointHeader *types.Header) ([]common.Address, error) {
+	startGapBlockHeader := checkpointHeader
+	number := checkpointHeader.Number.Uint64()
+	for step := uint64(1); step <= chain.Config().XDPoS.Gap; step++ {
+		startGapBlockHeader = chain.GetHeader(startGapBlockHeader.ParentHash, number-step)
+	}
+	signers, err := c.HookGetSignersFromContract(startGapBlockHeader.Hash())
+	if err != nil {
+		return []common.Address{}, fmt.Errorf("Can't get signers from Smart Contract . Err: %v", err)
+	}
+	return signers, nil
+}

core/blockchain.go

@@ -1271,7 +1271,7 @@ func (bc *BlockChain) insertChain(chain types.Blocks) (int, []interface{}, []*ty
 		stats.processed++
 		stats.usedGas += usedGas
 		stats.report(chain, i, bc.stateCache.TrieDB().Size())
-		if status == CanonStatTy && bc.chainConfig.XDPoS != nil {
+		if bc.chainConfig.XDPoS != nil {
 			// epoch block
 			if (chain[i].NumberU64() % bc.chainConfig.XDPoS.Epoch) == 0 {
 				CheckpointCh <- 1

params/version.go

@@ -22,7 +22,7 @@ import (
 
 const (
 	VersionMajor = 1        // Major version component of the current release
-	VersionMinor = 0        // Minor version component of the current release
+	VersionMinor = 1        // Minor version component of the current release
 	VersionPatch = 1        // Patch version component of the current release
 	VersionMeta  = "stable" // Version metadata to append to the version string
 )