/
server.go
224 lines (194 loc) · 4.79 KB
/
server.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
package etcd
import (
"context"
"net/http"
"sync"
"sync/atomic"
"time"
"github.com/eolinker/eosc/log"
"go.etcd.io/etcd/api/v3/mvccpb"
"go.etcd.io/etcd/api/v3/version"
clientv3 "go.etcd.io/etcd/client/v3"
"go.etcd.io/etcd/server/v3/etcdserver"
)
var _ Etcd = (*_Server)(nil)
type _Server struct {
config Config
ctx context.Context
cancel context.CancelFunc
mu sync.RWMutex
server *etcdserver.EtcdServer
raftHandler atomic.Pointer[http.Handler]
leaseHandler atomic.Pointer[http.Handler]
downgradeEnabledHandler atomic.Pointer[http.Handler]
hashKVHandler atomic.Pointer[http.Handler]
client *clientv3.Client
requestTimeout time.Duration
name string
leaderChangeHandler []ILeaderStateHandler
clientCh []chan *clientv3.Client
clusterData *Clusters
}
func (s *_Server) Status() ClusterInfo {
s.mu.RLock()
defer s.mu.RUnlock()
if s.server == nil {
return ClusterInfo{}
}
member := s.server.Cluster().Member(s.server.ID())
if member == nil {
return ClusterInfo{}
}
members := s.server.Cluster().Members()
leaderId := s.server.Leader()
nodes := s.clusterData.parse(leaderId, members...)
return ClusterInfo{
Cluster: s.clusterData.cluster,
Nodes: nodes,
}
}
func (s *_Server) Nodes() []*Node {
s.mu.RLock()
defer s.mu.RUnlock()
if s.server != nil {
members := s.server.Cluster().Members()
leaderId := s.server.Leader()
return s.clusterData.parse(leaderId, members...)
}
return []*Node{}
}
func (s *_Server) Version() Versions {
s.mu.RLock()
defer s.mu.RUnlock()
strv := "not_decided"
if s.server != nil {
v := s.server.Cluster().Version()
if v != nil {
strv = v.String()
}
}
return Versions{
Server: version.Version,
Cluster: strv,
}
}
func NewServer(ctx context.Context, mux *http.ServeMux, config Config) (*_Server, error) {
serverCtc, cancel := context.WithCancel(ctx)
s := &_Server{
config: config,
ctx: serverCtc,
cancel: cancel,
requestTimeout: 10 * time.Second,
clientCh: make([]chan *clientv3.Client, 0, 10),
}
s.mu.Lock()
defer s.mu.Unlock()
s.addHandler(mux)
err := s.initEtcdServer()
if err != nil {
return nil, err
}
return s, nil
}
func (s *_Server) Info() *Node {
s.mu.Lock()
defer s.mu.Unlock()
if s.server == nil {
return nil
}
member := s.server.Cluster().Member(s.server.ID())
leaderId := s.server.Leader()
nodes := s.clusterData.parse(leaderId, member)
if len(nodes) < 1 {
return nil
}
return nodes[0]
}
func (s *_Server) IsLeader() (bool, []string) {
s.mu.RLock()
defer s.mu.RUnlock()
return s.isLeader()
}
func (s *_Server) isLeader() (bool, []string) {
server := s.server
lead := server.Leader()
if lead == server.ID() {
return true, nil
}
return false, server.Cluster().Member(lead).PeerURLs
}
func (s *_Server) Put(key string, value []byte) error {
ctx, _ := s.requestContext()
_, err := s.client.Put(ctx, key, string(value))
return err
}
func (s *_Server) Delete(key string) error {
ctx, _ := s.requestContext()
_, err := s.client.Delete(ctx, key)
return err
}
func (s *_Server) Watch(prefix string, handler ServiceHandler) {
clientCh := make(chan *clientv3.Client, 1)
s.mu.Lock()
s.clientCh = append(s.clientCh, clientCh)
clientCh <- s.client
s.mu.Unlock()
wg := sync.WaitGroup{}
wg.Add(1)
go func() {
once := sync.Once{}
var watch clientv3.WatchChan = nil
for {
select {
case client, ok := <-clientCh:
{
if !ok {
continue
}
ctx, _ := s.requestContext()
response, err := client.Get(ctx, prefix, clientv3.WithPrefix())
if err != nil {
log.Warn("watch ", prefix, " error:", err)
clientCh <- client
continue
}
watch = client.Watch(s.ctx, prefix, clientv3.WithPrefix())
init := make([]*KValue, 0, response.Count+1)
for _, kv := range response.Kvs {
init = append(init, &KValue{
Key: kv.Key,
Value: kv.Value,
})
}
//init = append(init, &KValue{
// Key: []byte("/cluster/node"),
// Value: []byte(fmt.Sprintf("{\"cluster_id\":\"%s\",\"node_id\":\"%s\"}", s.clusterData.cluster, s.server.ID().String())),
//})
handler.Reset(init)
once.Do(func() {
wg.Done()
})
}
case <-s.ctx.Done():
return
case v, ok := <-watch:
if !ok {
watch = nil
continue
}
for _, e := range v.Events {
switch e.Type {
case mvccpb.DELETE:
handler.Delete(string(e.Kv.Key))
case mvccpb.PUT:
handler.Put(string(e.Kv.Key), e.Kv.Value)
}
}
}
}
}()
wg.Wait()
}
func (s *_Server) requestContext() (context.Context, context.CancelFunc) {
return context.WithTimeout(s.ctx, s.requestTimeout)
}