verify timeout from epochInfo instead of snap.NextEpochCandidates

Author: wanwiset25

consensus/XDPoS/engines/engine_v2/timeout.go

@@ -157,16 +157,6 @@ func (x *XDPoS_v2) verifyTC(chain consensus.ChainReader, timeoutCert *types.Time
 		return utils.ErrInvalidTC
 	}
 
-	snap, err := x.getSnapshot(chain, timeoutCert.GapNumber, true)
-	if err != nil {
-		log.Error("[verifyTC] Fail to get snapshot when verifying TC!", "tcGapNumber", timeoutCert.GapNumber)
-		return fmt.Errorf("[verifyTC] Unable to get snapshot, %s", err)
-	}
-	if snap == nil || len(snap.NextEpochCandidates) == 0 {
-		log.Error("[verifyTC] Something wrong with the snapshot from gapNumber", "messageGapNumber", timeoutCert.GapNumber, "snapshot", snap)
-		return errors.New("empty master node lists from snapshot")
-	}
-
 	signatures, duplicates := UniqueSignatures(timeoutCert.Signatures)
 	if len(duplicates) != 0 {
 		for _, d := range duplicates {
@@ -199,7 +189,7 @@ func (x *XDPoS_v2) verifyTC(chain consensus.ChainReader, timeoutCert *types.Time
 	for _, signature := range signatures {
 		go func(sig types.Signature) {
 			defer wg.Done()
-			verified, _, err := x.verifyMsgSignature(signedTimeoutObj, sig, snap.NextEpochCandidates)
+			verified, _, err := x.verifyMsgSignature(signedTimeoutObj, sig, epochInfo.Masternodes)
 			if err != nil || !verified {
 				log.Error("[verifyTC] Error or verification failure", "signature", sig, "error", err)
 				mutex.Lock() // Lock before accessing haveError