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package main
import (
"context"
"log"
"os"
"time"
"github.com/segmentio/kafka-go"
)
func main() {
if len(os.Args) < 3 {
log.Fatal("Usage: kafka-go-consumer <broker> <topic>")
}
broker := os.Args[1]
topic := os.Args[2]
log.Printf("Connecting to Kafka broker: %s", broker)
log.Printf("Topic: %s", topic)
// Create a new reader
r := kafka.NewReader(kafka.ReaderConfig{
Brokers: []string{broker},
Topic: topic,
GroupID: "kafka-go-test-group",
MinBytes: 1,
MaxBytes: 10e6, // 10MB
MaxWait: 1 * time.Second,
})
defer r.Close()
log.Printf("Starting to consume messages...")
ctx := context.Background()
messageCount := 0
errorCount := 0
startTime := time.Now()
for {
m, err := r.ReadMessage(ctx)
if err != nil {
errorCount++
log.Printf("Error reading message #%d: %v", messageCount+1, err)
// Stop after 10 consecutive errors or 60 seconds
if errorCount > 10 || time.Since(startTime) > 60*time.Second {
log.Printf("\nStopping after %d errors in %v", errorCount, time.Since(startTime))
break
}
continue
}
// Reset error count on successful read
errorCount = 0
messageCount++
log.Printf("Message #%d: topic=%s partition=%d offset=%d key=%s value=%s",
messageCount, m.Topic, m.Partition, m.Offset, string(m.Key), string(m.Value))
// Stop after 100 messages or 60 seconds
if messageCount >= 100 || time.Since(startTime) > 60*time.Second {
log.Printf("\nSuccessfully consumed %d messages in %v", messageCount, time.Since(startTime))
log.Printf("Success rate: %.1f%% (%d/%d including errors)",
float64(messageCount)/float64(messageCount+errorCount)*100, messageCount, messageCount+errorCount)
break
}
}
}
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