mirror of
https://github.com/etcd-io/etcd.git
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014ef0f52d
The data race happens when etcd updates member attributes and fetches member info in http handler at the same time.
127 lines
3.2 KiB
Go
127 lines
3.2 KiB
Go
/*
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Copyright 2014 CoreOS, Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package etcdserver
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import (
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"crypto/sha1"
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"encoding/binary"
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"fmt"
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"log"
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"math/rand"
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"path"
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"sort"
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"time"
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"github.com/coreos/etcd/pkg/types"
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)
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// RaftAttributes represents the raft related attributes of an etcd member.
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type RaftAttributes struct {
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// TODO(philips): ensure these are URLs
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PeerURLs []string `json:"peerURLs"`
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}
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// Attributes represents all the non-raft related attributes of an etcd member.
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type Attributes struct {
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Name string `json:"name,omitempty"`
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ClientURLs []string `json:"clientURLs,omitempty"`
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}
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type Member struct {
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ID types.ID `json:"id"`
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RaftAttributes
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Attributes
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}
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// newMember creates a Member without an ID and generates one based on the
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// name, peer URLs. This is used for bootstrapping/adding new member.
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func NewMember(name string, peerURLs types.URLs, clusterName string, now *time.Time) *Member {
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m := &Member{
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RaftAttributes: RaftAttributes{PeerURLs: peerURLs.StringSlice()},
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Attributes: Attributes{Name: name},
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}
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var b []byte
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sort.Strings(m.PeerURLs)
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for _, p := range m.PeerURLs {
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b = append(b, []byte(p)...)
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}
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b = append(b, []byte(clusterName)...)
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if now != nil {
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b = append(b, []byte(fmt.Sprintf("%d", now.Unix()))...)
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}
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hash := sha1.Sum(b)
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m.ID = types.ID(binary.BigEndian.Uint64(hash[:8]))
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return m
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}
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// PickPeerURL chooses a random address from a given Member's PeerURLs.
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// It will panic if there is no PeerURLs available in Member.
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func (m *Member) PickPeerURL() string {
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if len(m.PeerURLs) == 0 {
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log.Panicf("member should always have some peer url")
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}
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return m.PeerURLs[rand.Intn(len(m.PeerURLs))]
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}
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func (m *Member) Clone() *Member {
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if m == nil {
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return nil
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}
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mm := &Member{
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ID: m.ID,
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Attributes: Attributes{
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Name: m.Name,
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},
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}
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if m.PeerURLs != nil {
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mm.PeerURLs = make([]string, len(m.PeerURLs))
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copy(mm.PeerURLs, m.PeerURLs)
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}
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if m.ClientURLs != nil {
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mm.ClientURLs = make([]string, len(m.ClientURLs))
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copy(mm.ClientURLs, m.ClientURLs)
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}
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return mm
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}
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func memberStoreKey(id types.ID) string {
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return path.Join(storeMembersPrefix, id.String())
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}
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func mustParseMemberIDFromKey(key string) types.ID {
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id, err := types.IDFromString(path.Base(key))
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if err != nil {
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log.Panicf("unexpected parse member id error: %v", err)
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}
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return id
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}
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func removedMemberStoreKey(id types.ID) string {
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return path.Join(storeRemovedMembersPrefix, id.String())
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}
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type SortableMemberSliceByPeerURLs []*Member
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func (p SortableMemberSliceByPeerURLs) Len() int { return len(p) }
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func (p SortableMemberSliceByPeerURLs) Less(i, j int) bool {
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return p[i].PeerURLs[0] < p[j].PeerURLs[0]
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}
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func (p SortableMemberSliceByPeerURLs) Swap(i, j int) { p[i], p[j] = p[j], p[i] }
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