forked from micro/go-micro
-
Notifications
You must be signed in to change notification settings - Fork 1
/
consul_registry.go
319 lines (261 loc) · 6.73 KB
/
consul_registry.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
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
package registry
import (
"crypto/tls"
"errors"
"fmt"
"net"
"net/http"
"runtime"
"sync"
"time"
consul "github.com/hashicorp/consul/api"
hash "github.com/mitchellh/hashstructure"
)
type consulRegistry struct {
Address string
Client *consul.Client
opts Options
sync.Mutex
register map[string]uint64
}
func newTransport(config *tls.Config) *http.Transport {
if config == nil {
config = &tls.Config{
InsecureSkipVerify: true,
}
}
t := &http.Transport{
Proxy: http.ProxyFromEnvironment,
Dial: (&net.Dialer{
Timeout: 30 * time.Second,
KeepAlive: 30 * time.Second,
}).Dial,
TLSHandshakeTimeout: 10 * time.Second,
TLSClientConfig: config,
}
runtime.SetFinalizer(&t, func(tr **http.Transport) {
(*tr).CloseIdleConnections()
})
return t
}
func newConsulRegistry(opts ...Option) Registry {
var options Options
for _, o := range opts {
o(&options)
}
// use default config
config := consul.DefaultConfig()
if options.Context != nil {
// Use the consul config passed in the options, if available
if c, ok := options.Context.Value("consul_config").(*consul.Config); ok {
config = c
}
}
// check if there are any addrs
if len(options.Addrs) > 0 {
addr, port, err := net.SplitHostPort(options.Addrs[0])
if ae, ok := err.(*net.AddrError); ok && ae.Err == "missing port in address" {
port = "8500"
addr = options.Addrs[0]
config.Address = fmt.Sprintf("%s:%s", addr, port)
} else if err == nil {
config.Address = fmt.Sprintf("%s:%s", addr, port)
}
}
// requires secure connection?
if options.Secure || options.TLSConfig != nil {
if config.HttpClient == nil {
config.HttpClient = new(http.Client)
}
config.Scheme = "https"
// We're going to support InsecureSkipVerify
config.HttpClient.Transport = newTransport(options.TLSConfig)
}
// create the client
client, _ := consul.NewClient(config)
// set timeout
if options.Timeout > 0 {
config.HttpClient.Timeout = options.Timeout
}
cr := &consulRegistry{
Address: config.Address,
Client: client,
opts: options,
register: make(map[string]uint64),
}
return cr
}
func (c *consulRegistry) Deregister(s *Service) error {
if len(s.Nodes) == 0 {
return errors.New("Require at least one node")
}
// delete our hash of the service
c.Lock()
delete(c.register, s.Name)
c.Unlock()
node := s.Nodes[0]
return c.Client.Agent().ServiceDeregister(node.Id)
}
func getDeregisterTTL(t time.Duration) time.Duration {
// splay slightly for the watcher?
splay := time.Second * 5
deregTTL := t + splay
// consul has a minimum timeout on deregistration of 1 minute.
if t < time.Minute {
deregTTL = time.Minute + splay
}
return deregTTL
}
func (c *consulRegistry) Register(s *Service, opts ...RegisterOption) error {
if len(s.Nodes) == 0 {
return errors.New("Require at least one node")
}
var regTCPCheck bool
var regInterval time.Duration
var options RegisterOptions
for _, o := range opts {
o(&options)
}
if c.opts.Context != nil {
if tcpCheckInterval, ok := c.opts.Context.Value("consul_tcp_check").(time.Duration); ok {
regTCPCheck = true
regInterval = tcpCheckInterval
}
}
// create hash of service; uint64
h, err := hash.Hash(s, nil)
if err != nil {
return err
}
// use first node
node := s.Nodes[0]
// get existing hash
c.Lock()
v, ok := c.register[s.Name]
c.Unlock()
// if it's already registered and matches then just pass the check
if ok && v == h {
// if the err is nil we're all good, bail out
// if not, we don't know what the state is, so full re-register
if err := c.Client.Agent().PassTTL("service:"+node.Id, ""); err == nil {
return nil
}
}
// encode the tags
tags := encodeMetadata(node.Metadata)
tags = append(tags, encodeEndpoints(s.Endpoints)...)
tags = append(tags, encodeVersion(s.Version)...)
var check *consul.AgentServiceCheck
if regTCPCheck {
deregTTL := getDeregisterTTL(regInterval)
check = &consul.AgentServiceCheck{
TCP: fmt.Sprintf("%s:%d", node.Address, node.Port),
Interval: fmt.Sprintf("%v", regInterval),
DeregisterCriticalServiceAfter: fmt.Sprintf("%v", deregTTL),
}
// if the TTL is greater than 0 create an associated check
} else if options.TTL > time.Duration(0) {
deregTTL := getDeregisterTTL(options.TTL)
check = &consul.AgentServiceCheck{
TTL: fmt.Sprintf("%v", options.TTL),
DeregisterCriticalServiceAfter: fmt.Sprintf("%v", deregTTL),
}
}
// register the service
if err := c.Client.Agent().ServiceRegister(&consul.AgentServiceRegistration{
ID: node.Id,
Name: s.Name,
Tags: tags,
Port: node.Port,
Address: node.Address,
Check: check,
}); err != nil {
return err
}
// save our hash of the service
c.Lock()
c.register[s.Name] = h
c.Unlock()
// if the TTL is 0 we don't mess with the checks
if options.TTL == time.Duration(0) {
return nil
}
// pass the healthcheck
return c.Client.Agent().PassTTL("service:"+node.Id, "")
}
func (c *consulRegistry) GetService(name string) ([]*Service, error) {
rsp, _, err := c.Client.Health().Service(name, "", false, nil)
if err != nil {
return nil, err
}
serviceMap := map[string]*Service{}
for _, s := range rsp {
if s.Service.Service != name {
continue
}
// version is now a tag
version, _ := decodeVersion(s.Service.Tags)
// service ID is now the node id
id := s.Service.ID
// key is always the version
key := version
// address is service address
address := s.Service.Address
// use node address
if len(address) == 0 {
address = s.Node.Address
}
svc, ok := serviceMap[key]
if !ok {
svc = &Service{
Endpoints: decodeEndpoints(s.Service.Tags),
Name: s.Service.Service,
Version: version,
}
serviceMap[key] = svc
}
var del bool
for _, check := range s.Checks {
// delete the node if the status is critical
if check.Status == "critical" {
del = true
break
}
}
// if delete then skip the node
if del {
continue
}
svc.Nodes = append(svc.Nodes, &Node{
Id: id,
Address: address,
Port: s.Service.Port,
Metadata: decodeMetadata(s.Service.Tags),
})
}
var services []*Service
for _, service := range serviceMap {
services = append(services, service)
}
return services, nil
}
func (c *consulRegistry) ListServices() ([]*Service, error) {
rsp, _, err := c.Client.Catalog().Services(nil)
if err != nil {
return nil, err
}
var services []*Service
for service := range rsp {
services = append(services, &Service{Name: service})
}
return services, nil
}
func (c *consulRegistry) Watch(opts ...WatchOption) (Watcher, error) {
return newConsulWatcher(c, opts...)
}
func (c *consulRegistry) String() string {
return "consul"
}
func (c *consulRegistry) Options() Options {
return c.opts
}