p2p/discover: using slices.Contains (#29395)

Author: cuiweixie

p2p/discover/v4_lookup_test.go

@@ -285,7 +285,7 @@ func (tn *preminedTestnet) neighborsAtDistances(base *enode.Node, distances []ui
 		for i := range lookupTestnet.dists[d] {
 			n := lookupTestnet.node(d, i)
 			d := enode.LogDist(base.ID(), n.ID())
-			if containsUint(uint(d), distances) {
+			if slices.Contains(distances, uint(d)) {
 				result = append(result, n)
 				if len(result) >= elems {
 					return result

p2p/discover/v5_udp.go

@@ -25,6 +25,7 @@ import (
 	"fmt"
 	"io"
 	"net"
+	"slices"
 	"sync"
 	"time"
 
@@ -437,7 +438,7 @@ func (t *UDPv5) verifyResponseNode(c *callV5, r *enr.Record, distances []uint, s
 	}
 	if distances != nil {
 		nd := enode.LogDist(c.id, node.ID())
-		if !containsUint(uint(nd), distances) {
+		if !slices.Contains(distances, uint(nd)) {
 			return nil, errors.New("does not match any requested distance")
 		}
 	}
@@ -448,15 +449,6 @@ func (t *UDPv5) verifyResponseNode(c *callV5, r *enr.Record, distances []uint, s
 	return node, nil
 }
 
-func containsUint(x uint, xs []uint) bool {
-	for _, v := range xs {
-		if x == v {
-			return true
-		}
-	}
-	return false
-}
-
 // callToNode sends the given call and sets up a handler for response packets (of message
 // type responseType). Responses are dispatched to the call's response channel.
 func (t *UDPv5) callToNode(n *enode.Node, responseType byte, req v5wire.Packet) *callV5 {