k3s/vendor/go.etcd.io/etcd/raft/quorum/quorum.go

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2019-12-12 01:27:03 +00:00
// Copyright 2019 The etcd Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package quorum
import (
"math"
"strconv"
)
// Index is a Raft log position.
type Index uint64
func (i Index) String() string {
if i == math.MaxUint64 {
return "∞"
}
return strconv.FormatUint(uint64(i), 10)
}
// AckedIndexer allows looking up a commit index for a given ID of a voter
// from a corresponding MajorityConfig.
type AckedIndexer interface {
AckedIndex(voterID uint64) (idx Index, found bool)
}
type mapAckIndexer map[uint64]Index
func (m mapAckIndexer) AckedIndex(id uint64) (Index, bool) {
idx, ok := m[id]
return idx, ok
}
// VoteResult indicates the outcome of a vote.
//
//go:generate stringer -type=VoteResult
type VoteResult uint8
const (
// VotePending indicates that the decision of the vote depends on future
// votes, i.e. neither "yes" or "no" has reached quorum yet.
VotePending VoteResult = 1 + iota
// VoteLost indicates that the quorum has voted "no".
VoteLost
// VoteWon indicates that the quorum has voted "yes".
VoteWon
)