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// Copyright 2015 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 membership
import (
"crypto/sha1"
"encoding/binary"
"fmt"
"math/rand"
"sort"
"strings"
"time"
"go.etcd.io/etcd/client/pkg/v3/types"
)
// RaftAttributes represents the raft related attributes of an etcd member.
type RaftAttributes struct {
// PeerURLs is the list of peers in the raft cluster.
// TODO(philips): ensure these are URLs
PeerURLs []string `json:"peerURLs"`
// IsLearner indicates if the member is raft learner.
IsLearner bool `json:"isLearner,omitempty"`
}
// Attributes represents all the non-raft related attributes of an etcd member.
type Attributes struct {
Name string `json:"name,omitempty"`
ClientURLs []string `json:"clientURLs,omitempty"`
}
type Member struct {
ID types.ID `json:"id"`
RaftAttributes
Attributes
}
// NewMember creates a Member without an ID and generates one based on the
// cluster name, peer URLs, and time. This is used for bootstrapping/adding new member.
func NewMember(name string, peerURLs types.URLs, clusterName string, now *time.Time) *Member {
memberId := computeMemberId(peerURLs, clusterName, now)
return newMember(name, peerURLs, memberId, false)
}
// NewMemberAsLearner creates a learner Member without an ID and generates one based on the
// cluster name, peer URLs, and time. This is used for adding new learner member.
func NewMemberAsLearner(name string, peerURLs types.URLs, clusterName string, now *time.Time) *Member {
memberId := computeMemberId(peerURLs, clusterName, now)
return newMember(name, peerURLs, memberId, true)
}
func computeMemberId(peerURLs types.URLs, clusterName string, now *time.Time) types.ID {
peerURLstrs := peerURLs.StringSlice()
sort.Strings(peerURLstrs)
joinedPeerUrls := strings.Join(peerURLstrs, "")
b := []byte(joinedPeerUrls)
b = append(b, []byte(clusterName)...)
if now != nil {
b = append(b, []byte(fmt.Sprintf("%d", now.Unix()))...)
}
hash := sha1.Sum(b)
return types.ID(binary.BigEndian.Uint64(hash[:8]))
}
func newMember(name string, peerURLs types.URLs, memberId types.ID, isLearner bool) *Member {
m := &Member{
RaftAttributes: RaftAttributes{
PeerURLs: peerURLs.StringSlice(),
IsLearner: isLearner,
},
Attributes: Attributes{Name: name},
ID: memberId,
}
return m
}
// PickPeerURL chooses a random address from a given Member's PeerURLs.
// It will panic if there is no PeerURLs available in Member.
func (m *Member) PickPeerURL() string {
if len(m.PeerURLs) == 0 {
panic("member should always have some peer url")
}
return m.PeerURLs[rand.Intn(len(m.PeerURLs))]
}
func (m *Member) Clone() *Member {
if m == nil {
return nil
}
mm := &Member{
ID: m.ID,
RaftAttributes: RaftAttributes{
IsLearner: m.IsLearner,
},
Attributes: Attributes{
Name: m.Name,
},
}
if m.PeerURLs != nil {
mm.PeerURLs = make([]string, len(m.PeerURLs))
copy(mm.PeerURLs, m.PeerURLs)
}
if m.ClientURLs != nil {
mm.ClientURLs = make([]string, len(m.ClientURLs))
copy(mm.ClientURLs, m.ClientURLs)
}
return mm
}
func (m *Member) IsStarted() bool {
return len(m.Name) != 0
}
// MembersByID implements sort by ID interface
type MembersByID []*Member
func (ms MembersByID) Len() int { return len(ms) }
func (ms MembersByID) Less(i, j int) bool { return ms[i].ID < ms[j].ID }
func (ms MembersByID) Swap(i, j int) { ms[i], ms[j] = ms[j], ms[i] }
// MembersByPeerURLs implements sort by peer urls interface
type MembersByPeerURLs []*Member
func (ms MembersByPeerURLs) Len() int { return len(ms) }
func (ms MembersByPeerURLs) Less(i, j int) bool {
return ms[i].PeerURLs[0] < ms[j].PeerURLs[0]
}
func (ms MembersByPeerURLs) Swap(i, j int) { ms[i], ms[j] = ms[j], ms[i] }
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