fixed possible of infinite loop

#1625

Author: rekby

internal/balancer/local_dc.go

@@ -7,6 +7,7 @@ import (
 	"math/rand"
 	"net"
 	"net/url"
+	"slices"
 	"strings"
 	"sync"
 
@@ -157,21 +158,12 @@ func getRandomEndpoints(endpoints []endpoint.Endpoint, count int) []endpoint.End
 		return endpoints
 	}
 
-	got := make(map[int]bool, maxEndpointsCheckPerLocation)
+	endpoints = slices.Clone(endpoints)
+	rand.Shuffle(len(endpoints), func(i, j int) {
+		endpoints[i], endpoints[j] = endpoints[j], endpoints[i]
+	})
 
-	res := make([]endpoint.Endpoint, 0, maxEndpointsCheckPerLocation)
-	for len(got) < count {
-		//nolint:gosec
-		index := rand.Intn(len(endpoints))
-		if got[index] {
-			continue
-		}
-
-		got[index] = true
-		res = append(res, endpoints[index])
-	}
-
-	return res
+	return endpoints[:count]
 }
 
 func splitEndpointsByLocation(endpoints []endpoint.Endpoint) map[string][]endpoint.Endpoint {