-
Notifications
You must be signed in to change notification settings - Fork 29
/
client.go
213 lines (192 loc) · 4.69 KB
/
client.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
package eureka_client
import (
"fmt"
"os"
"os/signal"
"strings"
"sync"
"syscall"
"time"
)
// Client eureka客户端
type Client struct {
logger Logger
// for monitor system signal
signalChan chan os.Signal
mutex sync.RWMutex
running bool
Config *Config
Instance *Instance
// eureka服务中注册的应用
Applications *Applications
}
// Option 自定义
type Option func(instance *Instance)
// SetLogger 设置日志实现
func (c *Client) SetLogger(logger Logger) {
c.logger = logger
}
// Start 启动时注册客户端,并后台刷新服务列表,以及心跳
func (c *Client) Start() {
c.mutex.Lock()
c.running = true
c.mutex.Unlock()
// 刷新服务列表
go c.refresh()
// 心跳
go c.heartbeat()
// 监听退出信号,自动删除注册信息
go c.handleSignal()
}
// refresh 刷新服务列表
func (c *Client) refresh() {
timer := time.NewTimer(0)
interval := time.Duration(c.Config.RenewalIntervalInSecs) * time.Second
for c.running {
select {
case <-timer.C:
if err := c.doRefresh(); err != nil {
c.logger.Error("refresh application instance failed", err)
} else {
c.logger.Debug("refresh application instance successful")
}
}
// reset interval
timer.Reset(interval)
}
// stop
timer.Stop()
}
// heartbeat 心跳
func (c *Client) heartbeat() {
timer := time.NewTimer(0)
interval := time.Duration(c.Config.RegistryFetchIntervalSeconds) * time.Second
for c.running {
select {
case <-timer.C:
err := c.doHeartbeat()
if err == nil {
c.logger.Debug("heartbeat application instance successful")
} else if err == ErrNotFound {
// heartbeat not found, need register
err = c.doRegister()
if err == nil {
c.logger.Info("register application instance successful")
} else {
c.logger.Error("register application instance failed", err)
}
} else {
c.logger.Error("heartbeat application instance failed", err)
}
}
// reset interval
timer.Reset(interval)
}
// stop
timer.Stop()
}
func (c *Client) doRegister() error {
return Register(c.Config.DefaultZone, c.Config.App, c.Instance)
}
func (c *Client) doUnRegister() error {
return UnRegister(c.Config.DefaultZone, c.Instance.App, c.Instance.InstanceID)
}
func (c *Client) doHeartbeat() error {
return Heartbeat(c.Config.DefaultZone, c.Instance.App, c.Instance.InstanceID)
}
func (c *Client) doRefresh() error {
// todo If the delta is disabled or if it is the first time, get all applications
// get all applications
applications, err := Refresh(c.Config.DefaultZone)
if err != nil {
return err
}
// set applications
c.mutex.Lock()
c.Applications = applications
c.mutex.Unlock()
return nil
}
// handleSignal 监听退出信号,删除注册的实例
func (c *Client) handleSignal() {
if c.signalChan == nil {
c.signalChan = make(chan os.Signal)
}
signal.Notify(c.signalChan, syscall.SIGTERM, syscall.SIGINT, syscall.SIGKILL)
for {
switch <-c.signalChan {
case syscall.SIGINT:
fallthrough
case syscall.SIGKILL:
fallthrough
case syscall.SIGTERM:
c.logger.Info("receive exit signal, client instance going to de-register")
err := c.doUnRegister()
if err != nil {
c.logger.Error("de-register application instance failed", err)
} else {
c.logger.Info("de-register application instance successful")
}
os.Exit(0)
}
}
}
// NewClient 创建客户端
func NewClient(config *Config, opts ...Option) *Client {
defaultConfig(config)
instance := NewInstance(config)
client := &Client{
logger: NewLogger(),
Config: config,
Instance: instance,
}
for _, opt := range opts {
opt(client.Instance)
}
return client
}
func defaultConfig(config *Config) {
if config.DefaultZone == "" {
config.DefaultZone = "http://localhost:8761/eureka/"
}
if config.RenewalIntervalInSecs == 0 {
config.RenewalIntervalInSecs = 30
}
if config.RegistryFetchIntervalSeconds == 0 {
config.RegistryFetchIntervalSeconds = 15
}
if config.DurationInSecs == 0 {
config.DurationInSecs = 90
}
if config.App == "" {
config.App = "unknown"
} else {
config.App = strings.ToLower(config.App)
}
if config.IP == "" {
config.IP = GetLocalIP()
}
if config.HostName == "" {
config.HostName = config.IP
}
if config.Port == 0 {
config.Port = 80
}
if config.InstanceID == "" {
config.InstanceID = fmt.Sprintf("%s:%s:%d", config.IP, config.App, config.Port)
}
}
// 根据服务名获取注册的服务实例列表
func (c *Client) GetApplicationInstance(name string) []Instance {
instances := make([]Instance, 0)
c.mutex.Lock()
if c.Applications != nil {
for _, app := range c.Applications.Applications {
if app.Name == name {
instances = append(instances, app.Instances...)
}
}
}
c.mutex.Unlock()
return instances
}