-
Notifications
You must be signed in to change notification settings - Fork 151
/
rabbitmq.go
321 lines (261 loc) · 7.18 KB
/
rabbitmq.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
320
321
package rabbitmq
import (
"context"
"crypto/sha1"
"encoding/json"
"fmt"
"os"
"time"
"github.com/hatchet-dev/hatchet/internal/taskqueue"
amqp "github.com/rabbitmq/amqp091-go"
"github.com/rs/zerolog"
)
// session composes an amqp.Connection with an amqp.Channel
type session struct {
*amqp.Connection
*amqp.Channel
}
// TaskQueueImpl implements TaskQueue interface using AMQP.
type TaskQueueImpl struct {
ctx context.Context
sessions chan chan session
tasks chan *taskqueue.Task
identity string
l *zerolog.Logger
}
type TaskQueueImplOpt func(*TaskQueueImplOpts)
type TaskQueueImplOpts struct {
logger *zerolog.Logger
url string
}
func defaultTaskQueueImplOpts() *TaskQueueImplOpts {
zl := zerolog.New(os.Stderr)
return &TaskQueueImplOpts{
logger: &zl,
}
}
func WithLogger(l *zerolog.Logger) TaskQueueImplOpt {
return func(opts *TaskQueueImplOpts) {
opts.logger = l
}
}
func WithURL(url string) TaskQueueImplOpt {
return func(opts *TaskQueueImplOpts) {
opts.url = url
}
}
// New creates a new TaskQueueImpl.
func New(ctx context.Context, fs ...TaskQueueImplOpt) *TaskQueueImpl {
opts := defaultTaskQueueImplOpts()
for _, f := range fs {
f(opts)
}
sessions := redial(ctx, opts.logger, opts.url)
tasks := make(chan *taskqueue.Task)
t := &TaskQueueImpl{
ctx: ctx,
sessions: sessions,
tasks: tasks,
identity: identity(),
l: opts.logger,
}
// init the queues in a blocking fashion
for session := range sessions {
sub := <-session
t.initQueue(sub, string(taskqueue.EVENT_PROCESSING_QUEUE))
t.initQueue(sub, string(taskqueue.JOB_PROCESSING_QUEUE))
t.initQueue(sub, string(taskqueue.SCHEDULING_QUEUE))
break
}
// create publisher go func
go func() {
t.publish()
}()
return t
}
// AddTask adds a task to the queue.
func (t *TaskQueueImpl) AddTask(ctx context.Context, queue taskqueue.QueueType, task *taskqueue.Task) error {
t.tasks <- task
return nil
}
// Subscribe subscribes to the task queue.
func (t *TaskQueueImpl) Subscribe(ctx context.Context, queueType taskqueue.QueueType) (<-chan *taskqueue.Task, error) {
t.l.Debug().Msgf("subscribed to queue: %s", string(queueType))
// init the queues in a blocking fashion
for session := range t.sessions {
sub := <-session
t.initQueue(sub, string(queueType))
break
}
tasks := make(chan *taskqueue.Task)
go t.subscribe(ctx, t.identity, string(queueType), t.sessions, t.tasks, tasks)
return tasks, nil
}
func (t *TaskQueueImpl) initQueue(sub session, name string) {
if _, err := sub.QueueDeclare(name, true, false, false, false, nil); err != nil {
t.l.Error().Msgf("cannot declare queue: %q, %v", name, err)
return
}
}
func (t *TaskQueueImpl) publish() {
for session := range t.sessions {
pub := <-session
for {
select {
case task, running := <-t.tasks:
body, err := json.Marshal(task)
if err != nil {
t.l.Error().Msgf("error marshaling task queue: %v", err)
return
}
// all messages consumed
if !running {
t.l.Debug().Msgf("no more tasks to publish, returning")
return
}
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()
t.l.Debug().Msgf("publishing task %s to queue %s", task.ID, string(task.Queue))
err = pub.PublishWithContext(ctx, "", string(task.Queue), false, false, amqp.Publishing{
Body: body,
})
// TODO: retry failed delivery on the next session
if err != nil {
t.l.Error().Msgf("error publishing task: %v", err)
return
}
}
}
}
}
// func (t *TaskQueueImpl) publish() {
// for session := range t.sessions {
// var (
// running bool
// reading = t.tasks
// pending = make(chan []byte, 1)
// confirm = make(chan amqp.Confirmation, 1)
// )
// pub := <-session
// // publisher confirms for this channel/connection
// if err := pub.Channel.Confirm(false); err != nil {
// t.l.Info().Msgf("publisher confirms not supported")
// close(confirm) // confirms not supported, simulate by always nacking
// } else {
// pub.NotifyPublish(confirm)
// }
// ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
// defer cancel()
// Publish:
// for {
// var (
// body []byte
// task *taskqueue.Task
// )
// select {
// case confirmed, ok := <-confirm:
// if !ok {
// break Publish
// }
// if !confirmed.Ack {
// t.l.Info().Msgf("nack message %d", confirmed.DeliveryTag)
// }
// reading = t.tasks
// case body = <-pending:
// err := pub.PublishWithContext(ctx, "", string(task.Queue), false, false, amqp.Publishing{
// Body: body,
// })
// // Retry failed delivery on the next session
// if err != nil {
// pending <- body
// pub.Channel.Close()
// break Publish
// }
// case task, running = <-reading:
// body, err := json.Marshal(task)
// if err != nil {
// t.l.Error().Msgf("error marshaling task queue: %v", err)
// return
// }
// // all messages consumed
// if !running {
// return
// }
// // work on pending delivery until ack'd
// pending <- body
// reading = nil
// }
// }
// }
// }
func (t *TaskQueueImpl) subscribe(ctx context.Context, subId, queue string, sessions chan chan session, messages chan *taskqueue.Task, tasks chan<- *taskqueue.Task) {
for session := range sessions {
sub := <-session
deliveries, err := sub.Consume(queue, subId, false, false, false, false, nil)
if err != nil {
t.l.Error().Msgf("cannot consume from: %q, %v", queue, err)
return
}
for msg := range deliveries {
task := &taskqueue.Task{}
if err := json.Unmarshal(msg.Body, task); err != nil {
t.l.Error().Msgf("error unmarshaling message: %v", err)
continue
}
t.l.Debug().Msgf("got task: %v", task.ID)
tasks <- task
sub.Ack(msg.DeliveryTag, false)
}
}
}
// redial continually connects to the URL, exiting the program when no longer possible
func redial(ctx context.Context, l *zerolog.Logger, url string) chan chan session {
sessions := make(chan chan session)
go func() {
sess := make(chan session)
defer close(sessions)
for {
select {
case sessions <- sess:
case <-ctx.Done():
l.Info().Msgf("shutting down session factory")
return
}
newSession, err := getSession(ctx, l, url)
if err != nil {
l.Error().Msgf("error getting session: %v", err)
return
}
select {
case sess <- newSession:
case <-ctx.Done():
l.Info().Msgf("shutting down new session")
return
}
}
}()
return sessions
}
// identity returns the same host/process unique string for the lifetime of
// this process so that subscriber reconnections reuse the same queue name.
func identity() string {
hostname, err := os.Hostname()
h := sha1.New()
fmt.Fprint(h, hostname)
fmt.Fprint(h, err)
fmt.Fprint(h, os.Getpid())
return fmt.Sprintf("%x", h.Sum(nil))
}
func getSession(ctx context.Context, l *zerolog.Logger, url string) (session, error) {
conn, err := amqp.Dial(url)
if err != nil {
l.Error().Msgf("cannot (re)dial: %v: %q", err, url)
return session{}, err
}
ch, err := conn.Channel()
if err != nil {
l.Error().Msgf("cannot create channel: %v", err)
return session{}, err
}
return session{conn, ch}, nil
}