make user tipst Do NOT include more than one blocks mined by a miner

pkg/chainsync/types/target_tracker.go

@@ -2,6 +2,7 @@ package types
 
 import (
 	"container/list"
+	"github.com/filecoin-project/go-address"
 	"sort"
 	"strconv"
 	"sync"
@@ -258,6 +259,8 @@ func (tq *TargetTracker) widen(t *Target) (*Target, bool) {
 		}
 	}
 
+	miners := make(map[address.Address]interface{})
+
 	//collect neighbor block in queue include history to get block with same weight and height
 	sameWeightBlks := make(map[cid.Cid]*types.BlockHeader)
 	for _, val := range tq.targetSet {
@@ -266,7 +269,13 @@ func (tq *TargetTracker) widen(t *Target) (*Target, bool) {
 				bid := blk.Cid()
 				if !t.Head.Key().Has(bid) {
 					if _, ok := sameWeightBlks[bid]; !ok {
+						if _, isok := miners[blk.Miner]; isok {
+							// TODO: a miner mined more than one blocks ?
+							log.Warnf("miner : %s mined more than one blocks, this is illegal", blk.Miner.String())
+							return nil, false
+						}
 						sameWeightBlks[bid] = blk
+						miners[blk.Miner] = nil
 					}
 				}
 			}