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	if p.options.Namespace != "" {
		msg.Topic = p.options.Namespace + "%" + msg.Topic
	}

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package main

import (
	"context"
	"fmt"
	"os"
	"time"

	"github.com/apache/rocketmq-client-go/v2"
	"github.com/apache/rocketmq-client-go/v2/consumer"
	"github.com/apache/rocketmq-client-go/v2/primitive"
)

func main() {
	c, err := rocketmq.NewPushConsumer(
		consumer.WithGroupName("testGroup"),
		consumer.WithNameServer([]string{"127.0.0.1:9876"}),
		consumer.WithCredentials(primitive.Credentials{
			AccessKey: "RocketMQ",
			SecretKey: "12345678",
		}),
		consumer.WithNamespace("namespace"),
	)
	if err != nil {
		fmt.Println("init consumer error: " + err.Error())
		os.Exit(0)
	}

	err = c.Subscribe("test", consumer.MessageSelector{}, func(ctx context.Context,
		msgs ...*primitive.MessageExt) (consumer.ConsumeResult, error) {
		fmt.Printf("subscribe callback: %v \n", msgs)
		return consumer.ConsumeSuccess, nil
	})
	if err != nil {
		fmt.Println(err.Error())
	}
	// Note: start after subscribe
	err = c.Start()
	if err != nil {
		fmt.Println(err.Error())
		os.Exit(-1)
	}
	time.Sleep(time.Hour)
	err = c.Shutdown()
	if err != nil {
		fmt.Printf("Shutdown Consumer error: %s", err.Error())
	}
}

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package main

import (
	"context"
	"fmt"
	"os"

	"github.com/apache/rocketmq-client-go/v2"
	"github.com/apache/rocketmq-client-go/v2/primitive"
	"github.com/apache/rocketmq-client-go/v2/producer"
)

func main() {
	p, err := rocketmq.NewProducer(
		producer.WithNameServer([]string{"127.0.0.1:9876"}),
		producer.WithRetry(2),
		producer.WithCredentials(primitive.Credentials{
			AccessKey: "RocketMQ",
			SecretKey: "12345678",
		}),
		producer.WithNamespace("namespace"),
	)

	if err != nil {
		fmt.Println("init producer error: " + err.Error())
		os.Exit(0)
	}

	err = p.Start()
	if err != nil {
		fmt.Printf("start producer error: %s", err.Error())
		os.Exit(1)
	}
	for i := 0; i < 100000; i++ {
		res, err := p.SendSync(context.Background(), primitive.NewMessage("test",
			[]byte("Hello RocketMQ Go Client!")))

		if err != nil {
			fmt.Printf("send message error: %s\n", err)
		} else {
			fmt.Printf("send message success: result=%s\n", res.String())
		}
	}
	err = p.Shutdown()
	if err != nil {
		fmt.Printf("shutdown producer error: %s", err.Error())
	}
}