1 /* 2 Copyright 2018 The Kubernetes Authors. 3 4 Licensed under the Apache License, Version 2.0 (the "License"); 5 you may not use this file except in compliance with the License. 6 You may obtain a copy of the License at 7 8 http://www.apache.org/licenses/LICENSE-2.0 9 10 Unless required by applicable law or agreed to in writing, software 11 distributed under the License is distributed on an "AS IS" BASIS, 12 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 See the License for the specific language governing permissions and 14 limitations under the License. 15 */ 16 17 package util 18 19 import ( 20 "net" 21 ) 22 23 // NetworkInterfacer defines an interface for several net library functions. Production 24 // code will forward to net library functions, and unit tests will override the methods 25 // for testing purposes. 26 type NetworkInterfacer interface { 27 InterfaceAddrs() ([]net.Addr, error) 28 } 29 30 // RealNetwork implements the NetworkInterfacer interface for production code, just 31 // wrapping the underlying net library function calls. 32 type RealNetwork struct{} 33 34 // InterfaceAddrs wraps net.InterfaceAddrs(), it's a part of NetworkInterfacer interface. 35 func (RealNetwork) InterfaceAddrs() ([]net.Addr, error) { 36 return net.InterfaceAddrs() 37 } 38 39 var _ NetworkInterfacer = &RealNetwork{} 40