client: permute endpoints manually (for Go 1.9>)
To keep backward compatibility, use old algorithm of
rand.Rand.Perm.
Reference:
@@ -670,8 +670,15 @@ func (r *redirectedHTTPAction) HTTPRequest(ep url.URL) *http.Request {
}
func shuffleEndpoints(r *rand.Rand, eps []url.URL) []url.URL {
- p := r.Perm(len(eps))
- neps := make([]url.URL, len(eps))
+ // copied from Go 1.9<= rand.Rand.Perm
+ n := len(eps)
+ p := make([]int, n)
+ for i := 0; i < n; i++ {
+ j := r.Intn(i + 1)
+ p[i] = p[j]
+ p[j] = i
+ }
+ neps := make([]url.URL, n)
for i, k := range p {
neps[i] = eps[k]
}
