fix: txpool concurrent map issue (#252)

Co-authored-by: andyzhang2023 <[email protected]>

core/txpool/legacypool/legacypool.go

@@ -609,15 +609,7 @@ func (pool *LegacyPool) Stats() (int, int) {
 // stats retrieves the current pool stats, namely the number of pending and the
 // number of queued (non-executable) transactions.
 func (pool *LegacyPool) stats() (int, int) {
-	pending := 0
-	for _, list := range pool.pending {
-		pending += list.Len()
-	}
-	queued := 0
-	for _, list := range pool.queue {
-		queued += list.Len()
-	}
-	return pending, queued
+	return pool.pendingCounter, pool.queueCounter
 }
 
 // Content retrieves the data content of the transaction pool, returning all the
@@ -1496,7 +1488,7 @@ func (pool *LegacyPool) runReorg(done chan struct{}, reset *txpoolResetRequest,
 			resetPromoteTimer.Update(promoteDur)
 			resetFeedTimer.Update(sendfeedDur)
 
-			pending, queued := pool.stats()
+			pending, queued := pool.Stats()
 			if reset.newHead != nil && reset.oldHead != nil {
 				log.Info("Transaction pool reorged", "from", reset.oldHead.Number.Uint64(), "to", reset.newHead.Number.Uint64(),
 					"reorgCost", reorgCost, "waittime", waittime, "promoted", len(promoted), "demoted", demoted, "sendFeed", sendFeed, "pending", pending, "queued", queued,