/
handler.go
77 lines (64 loc) · 1.62 KB
/
handler.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
package consumer
import (
"context"
"github.com/cenkalti/backoff/v4"
"github.com/go-errors/errors"
"github.com/segmentio/kafka-go"
kafkatrace "gopkg.in/DataDog/dd-trace-go.v1/contrib/segmentio/kafka.go.v0"
"gopkg.in/DataDog/dd-trace-go.v1/ddtrace/tracer"
)
type messageHandler struct {
ConsumerID string
GroupID string
DataDogTracingEnabled bool
BackOffConstructor HandlerRetryBackOffConstructor
clientNotify NotifyError
}
func (h *messageHandler) dispatch(ctx context.Context, msg kafka.Message, handler Handler) error {
var err error
var backOff backoff.BackOff
if h.BackOffConstructor == nil {
backOff = &backoff.StopBackOff{}
} else {
backOff = h.BackOffConstructor()
}
attempt := 0
ticker := backoff.NewTicker(backOff)
defer ticker.Stop()
if h.DataDogTracingEnabled {
spanCtx, err := kafkatrace.ExtractSpanContext(msg)
if err != nil {
return errors.Errorf("unable to extract data dog span context from kafka message: %w", err)
}
span := tracer.StartSpan("consumer.handle", tracer.ChildOf(spanCtx))
defer span.Finish()
ctx = tracer.ContextWithSpan(ctx, span)
}
for {
select {
case <-ctx.Done():
if err == nil {
return ctx.Err()
}
return errors.Errorf("consumer handler error: %w", err)
case _, ok := <-ticker.C:
if !ok {
return err
}
}
attempt++
consumerMsg := Message{
Message: msg,
Metadata: Metadata{
GroupID: h.GroupID,
ConsumerID: h.ConsumerID,
Attempt: attempt,
},
}
if err = handler(ctx, consumerMsg); err != nil {
h.clientNotify(ctx, err, consumerMsg)
continue
}
return nil
}
}