1 // Copyright 2019 The etcd Authors 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 package raftpb 16 17 import ( 18 "fmt" 19 "reflect" 20 "sort" 21 ) 22 23 // Equivalent returns a nil error if the inputs describe the same configuration. 24 // On mismatch, returns a descriptive error showing the differences. 25 func (cs ConfState) Equivalent(cs2 ConfState) error { 26 cs1 := cs 27 orig1, orig2 := cs1, cs2 28 s := func(sl *[]uint64) { 29 *sl = append([]uint64(nil), *sl...) 30 sort.Slice(*sl, func(i, j int) bool { return (*sl)[i] < (*sl)[j] }) 31 } 32 33 for _, cs := range []*ConfState{&cs1, &cs2} { 34 s(&cs.Voters) 35 s(&cs.Learners) 36 s(&cs.VotersOutgoing) 37 s(&cs.LearnersNext) 38 } 39 40 if !reflect.DeepEqual(cs1, cs2) { 41 return fmt.Errorf("ConfStates not equivalent after sorting:\n%+#v\n%+#v\nInputs were:\n%+#v\n%+#v", cs1, cs2, orig1, orig2) 42 } 43 return nil 44 } 45