| // Copyright 2015 The Vanadium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| package discovery |
| |
| import ( |
| "crypto/rand" |
| |
| "v.io/v23/discovery" |
| ) |
| |
| func copyService(service *discovery.Service) discovery.Service { |
| copied := discovery.Service{ |
| InstanceId: service.InstanceId, |
| InstanceName: service.InstanceName, |
| InterfaceName: service.InterfaceName, |
| } |
| if n := len(service.Attrs); n > 0 { |
| copied.Attrs = make(discovery.Attributes, n) |
| for k, v := range service.Attrs { |
| copied.Attrs[k] = v |
| } |
| } |
| copied.Addrs = make([]string, len(service.Addrs)) |
| copy(copied.Addrs, service.Addrs) |
| return copied |
| } |
| |
| func newInstanceId() (string, error) { |
| // Generate a random 119 bit ascii string, which is similar to 122 bit random UUID. |
| const idLen = 17 |
| |
| instanceId := make([]byte, idLen) |
| if _, err := rand.Read(instanceId); err != nil { |
| return "", err |
| } |
| for i := 0; i < idLen; i++ { |
| instanceId[i] &= 0x7f |
| } |
| return string(instanceId), nil |
| } |
