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
|
package processor
import (
"context"
"fmt"
"log"
"os"
"os/signal"
"syscall"
"time"
"github.com/segmentio/kafka-go"
)
type Processor struct {
kafka_reader *kafka.Reader
}
func NewProcessor(kafka_reader *kafka.Reader) Processor {
log.Println("Created processor")
return Processor{
kafka_reader: kafka_reader,
}
}
func (p Processor) ProcessMessages() {
signals := make(chan os.Signal, 1)
signal.Notify(signals, syscall.SIGINT, syscall.SIGKILL)
ctx, cancel := context.WithCancel(context.Background())
// go routine for getting signals asynchronously
go func() {
sig := <-signals
log.Println("Got signal: ", sig)
cancel()
}()
for {
m, err := p.kafka_reader.FetchMessage(ctx)
if err != nil {
log.Panic("failed to fetch message:", err)
}
fmt.Printf("(%s): message at offset %d: %s = %s\n", time.Now().String(), m.Offset, string(m.Key), string(m.Value))
p.kafka_reader.CommitMessages(ctx, m)
}
if err := p.kafka_reader.Close(); err != nil {
log.Fatal("failed to close reader:", err)
}
}
|
