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package main
import (
"context"
"flag"
"fmt"
"log"
"os"
"os/signal"
"strings"
"time"
stdout "go.opentelemetry.io/otel/exporters/stdout/stdoutmetric"
"github.com/IBM/sarama"
)
var (
brokers = flag.String("brokers", "localhost:9092", "The Kafka brokers to connect to, as a comma separated list")
version = flag.String("version", sarama.DefaultVersion.String(), "Kafka cluster version")
topic = flag.String("topic", "default_topic", "The Kafka topic to use")
logger = log.New(os.Stdout, "[OTelInterceptor] ", log.LstdFlags)
)
func main() {
flag.Parse()
if *brokers == "" {
logger.Fatalln("at least one broker is required")
}
splitBrokers := strings.Split(*brokers, ",")
sarama.Logger = log.New(os.Stdout, "[Sarama] ", log.LstdFlags)
version, err := sarama.ParseKafkaVersion(*version)
if err != nil {
log.Panicf("Error parsing Kafka version: %v", err)
}
// oTel stdout example
pusher, err := stdout.New()
if err != nil {
logger.Fatalf("failed to initialize stdout export pipeline: %v", err)
}
defer pusher.Shutdown(context.Background())
// simple sarama producer that adds a new producer interceptor
conf := sarama.NewConfig()
conf.Version = version
conf.Producer.Interceptors = []sarama.ProducerInterceptor{NewOTelInterceptor(splitBrokers)}
producer, err := sarama.NewAsyncProducer(splitBrokers, conf)
if err != nil {
panic("Couldn't create a Kafka producer")
}
defer producer.AsyncClose()
// kill -2, trap SIGINT to trigger a shutdown
signals := make(chan os.Signal, 1)
signal.Notify(signals, os.Interrupt)
// ticker
bulkSize := 2
duration := 5 * time.Second
ticker := time.NewTicker(duration)
logger.Printf("Starting to produce %v messages every %v", bulkSize, duration)
for {
select {
case t := <-ticker.C:
now := t.Format(time.RFC3339)
logger.Printf("\nproducing %v messages to topic %s at %s", bulkSize, *topic, now)
for i := 0; i < bulkSize; i++ {
producer.Input() <- &sarama.ProducerMessage{
Topic: *topic, Key: nil,
Value: sarama.StringEncoder(fmt.Sprintf("test message %v/%v from kafka-client-go-test at %s", i+1, bulkSize, now)),
}
}
case <-signals:
logger.Println("terminating the program")
logger.Println("Bye :)")
return
}
}
}
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