/
service.go
271 lines (227 loc) · 5.5 KB
/
service.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
package service
import (
"context"
"fmt"
"io"
"sync"
"time"
"github.com/Allenxuxu/mMicro/client"
"github.com/Allenxuxu/mMicro/router"
pb "github.com/Allenxuxu/mMicro/router/service/proto"
)
type svc struct {
sync.RWMutex
opts router.Options
callOpts []client.CallOption
router pb.RouterService
table *table
exit chan bool
errChan chan error
advertChan chan *router.Advert
}
// NewRouter creates new service router and returns it
func NewRouter(opts ...router.Option) router.Router {
// get default options
options := router.DefaultOptions()
// apply requested options
for _, o := range opts {
o(&options)
}
// TODO: might need some client opts here
cli := client.NewClient()
// set options client
if options.Client != nil {
cli = options.Client
}
// NOTE: should we have Client/Service option in router.Options?
s := &svc{
opts: options,
router: pb.NewRouterService(router.DefaultName, cli),
}
// set the router address to call
if len(options.Address) > 0 {
s.callOpts = []client.CallOption{
client.WithAddress(options.Address),
}
}
// set the table
s.table = &table{pb.NewTableService(router.DefaultName, cli), s.callOpts}
return s
}
// Init initializes router with given options
func (s *svc) Init(opts ...router.Option) error {
s.Lock()
defer s.Unlock()
for _, o := range opts {
o(&s.opts)
}
return nil
}
// Options returns router options
func (s *svc) Options() router.Options {
s.Lock()
opts := s.opts
s.Unlock()
return opts
}
// Table returns routing table
func (s *svc) Table() router.Table {
return s.table
}
// Start starts the service
func (s *svc) Start() error {
s.Lock()
defer s.Unlock()
return nil
}
func (s *svc) advertiseEvents(advertChan chan *router.Advert, stream pb.Router_AdvertiseService) error {
go func() {
<-s.exit
stream.Close()
}()
var advErr error
for {
resp, err := stream.Recv()
if err != nil {
if err != io.EOF {
advErr = err
}
break
}
events := make([]*router.Event, len(resp.Events))
for i, event := range resp.Events {
route := router.Route{
Service: event.Route.Service,
Address: event.Route.Address,
Gateway: event.Route.Gateway,
Network: event.Route.Network,
Link: event.Route.Link,
Metric: event.Route.Metric,
}
events[i] = &router.Event{
Id: event.Id,
Type: router.EventType(event.Type),
Timestamp: time.Unix(0, event.Timestamp),
Route: route,
}
}
advert := &router.Advert{
Id: resp.Id,
Type: router.AdvertType(resp.Type),
Timestamp: time.Unix(0, resp.Timestamp),
TTL: time.Duration(resp.Ttl),
Events: events,
}
select {
case advertChan <- advert:
case <-s.exit:
close(advertChan)
return nil
}
}
// close the channel on exit
close(advertChan)
return advErr
}
// Advertise advertises routes to the network
func (s *svc) Advertise() (<-chan *router.Advert, error) {
s.Lock()
defer s.Unlock()
stream, err := s.router.Advertise(context.Background(), &pb.Request{}, s.callOpts...)
if err != nil {
return nil, fmt.Errorf("failed getting advert stream: %s", err)
}
// create advertise and event channels
advertChan := make(chan *router.Advert)
go s.advertiseEvents(advertChan, stream)
return advertChan, nil
}
// Process processes incoming adverts
func (s *svc) Process(advert *router.Advert) error {
events := make([]*pb.Event, 0, len(advert.Events))
for _, event := range advert.Events {
route := &pb.Route{
Service: event.Route.Service,
Address: event.Route.Address,
Gateway: event.Route.Gateway,
Network: event.Route.Network,
Link: event.Route.Link,
Metric: event.Route.Metric,
}
e := &pb.Event{
Id: event.Id,
Type: pb.EventType(event.Type),
Timestamp: event.Timestamp.UnixNano(),
Route: route,
}
events = append(events, e)
}
advertReq := &pb.Advert{
Id: s.Options().Id,
Type: pb.AdvertType(advert.Type),
Timestamp: advert.Timestamp.UnixNano(),
Events: events,
}
if _, err := s.router.Process(context.Background(), advertReq, s.callOpts...); err != nil {
return err
}
return nil
}
// Remote router cannot be stopped
func (s *svc) Stop() error {
s.Lock()
defer s.Unlock()
select {
case <-s.exit:
return nil
default:
close(s.exit)
}
return nil
}
// Lookup looks up routes in the routing table and returns them
func (s *svc) Lookup(q ...router.QueryOption) ([]router.Route, error) {
// call the router
query := router.NewQuery(q...)
resp, err := s.router.Lookup(context.Background(), &pb.LookupRequest{
Query: &pb.Query{
Service: query.Service,
Gateway: query.Gateway,
Network: query.Network,
},
}, s.callOpts...)
// errored out
if err != nil {
return nil, err
}
routes := make([]router.Route, len(resp.Routes))
for i, route := range resp.Routes {
routes[i] = router.Route{
Service: route.Service,
Address: route.Address,
Gateway: route.Gateway,
Network: route.Network,
Link: route.Link,
Metric: route.Metric,
}
}
return routes, nil
}
// Watch returns a watcher which allows to track updates to the routing table
func (s *svc) Watch(opts ...router.WatchOption) (router.Watcher, error) {
rsp, err := s.router.Watch(context.Background(), &pb.WatchRequest{}, s.callOpts...)
if err != nil {
return nil, err
}
options := router.WatchOptions{
Service: "*",
}
for _, o := range opts {
o(&options)
}
return newWatcher(rsp, options)
}
// Returns the router implementation
func (s *svc) String() string {
return "service"
}