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 quorum 16 17 import ( 18 "math" 19 "strconv" 20 ) 21 22 // Index is a Raft log position. 23 type Index uint64 24 25 func (i Index) String() string { 26 if i == math.MaxUint64 { 27 return "∞" 28 } 29 return strconv.FormatUint(uint64(i), 10) 30 } 31 32 // AckedIndexer allows looking up a commit index for a given ID of a voter 33 // from a corresponding MajorityConfig. 34 type AckedIndexer interface { 35 AckedIndex(voterID uint64) (idx Index, found bool) 36 } 37 38 type mapAckIndexer map[uint64]Index 39 40 func (m mapAckIndexer) AckedIndex(id uint64) (Index, bool) { 41 idx, ok := m[id] 42 return idx, ok 43 } 44 45 // VoteResult indicates the outcome of a vote. 46 // 47 //go:generate stringer -type=VoteResult 48 type VoteResult uint8 49 50 const ( 51 // VotePending indicates that the decision of the vote depends on future 52 // votes, i.e. neither "yes" or "no" has reached quorum yet. 53 VotePending VoteResult = 1 + iota 54 // VoteLost indicates that the quorum has voted "no". 55 VoteLost 56 // VoteWon indicates that the quorum has voted "yes". 57 VoteWon 58 ) 59