Go 关于 kafka 的生产者、消费者实例

zookeeper + kafka

首先要在 apche 官网下载 kafka 的程序包（linux版本），然后放到服务器上解压，得到以下目录

bin 目录下包含了服务的启动脚本

启动 zookeeper

./bin/zookeeper-server-start.sh config/zookeeper.properties

　　

启动 kafka server

./bin/kafka-server-start.sh config/server.properties

创建一个主题

./bin/kafka-topics.sh --create --zookeeper localhost:2181 --replication-factor 1 --partitions 1 --topic cctv1(主题名)

　　

启动生产者

./bin/kafka-console-producer.sh --broker-list localhost:9092 --topic cctv1

启动消费者

./bin/kafka-console-consumer.sh --bootstrap-server localhost:9092 --topic cctv1

如果要消费前面的数据，在启动时添加 --from-beginning 参数

./bin/kafka-console-consumer.sh --bootstrap-server localhost:9092 --topic cctv1 --from-beginning

查看 kafka 进程命令：

jps

producer

安装 Sarama 包

go get github.com/Shopify/sarama

demo：创建生产者，往单节点的 kafka 上发送数据

package main
import (
   "fmt"
   "github.com/Shopify/sarama"
   "time"
)

//消息写入kafka
func main() {
   //初始化配置
   config := sarama.NewConfig()
   config.Producer.RequiredAcks = sarama.WaitForAll
   config.Producer.Partitioner = sarama.NewRandomPartitioner
   config.Producer.Return.Successes = true
   //生产者
   client, err := sarama.NewSyncProducer([]string{"10.10.4.35:9092"}, config)
   if err != nil {
      fmt.Println("producer close,err:", err)
      return
   }
   defer client.Close()

   for i:=0; i<5; i++ {
      //创建消息
      msg := &sarama.ProducerMessage{}
      msg.Topic = "cctv1"
      msg.Value = sarama.StringEncoder("this is a good test,hello kai")
      //发送消息
      pid, offset, err := client.SendMessage(msg)
      if err != nil {
         fmt.Println("send message failed,", err)
         return
      }
      fmt.Printf("pid:%v offset:%v\n", pid, offset)
      time.Sleep(time.Second)
   }
}

运行结果：（上述代码执行一下，就会往 kafka 中 cctv1 的主题发布 5 条消息）

然后通过 kafka 自带的消费者终端查看发送的数据

./bin/kafka-console-consumer.sh --bootstrap-server 10.10.4.35:9092 --topic cctv1 --from-beginning

consumer

demo：创建消费者，从单节点的 kafka 中消费数据

package main
import (
	"fmt"
	"github.com/Shopify/sarama"
	"sync"
)

var wg sync.WaitGroup

func main() {
    consumer, err := sarama.NewConsumer([]string{"10.10.4.35:9092"}, nil)
    if err != nil {
        fmt.Println("consumer connect err:", err)
        return
    }
    defer consumer.Close()

    //获取 kafka 主题
    partitions, err := consumer.Partitions("cctv1")
    if err != nil {
        fmt.Println("get partitions failed, err:", err)
        return
    }

    for _, p := range partitions {
    	//sarama.OffsetNewest：从当前的偏移量开始消费，sarama.OffsetOldest：从最老的偏移量开始消费
        partitionConsumer, err := consumer.ConsumePartition("cctv1", p, sarama.OffsetNewest)
        if err != nil {
            fmt.Println("partitionConsumer err:", err)
            continue
        }
        wg.Add(1)
        go func(){
            for m := range partitionConsumer.Messages() {
                fmt.Printf("key: %s, text: %s, offset: %d\n", string(m.Key), string(m.Value), m.Offset)
            }
            wg.Done()
        }()
    }
    wg.Wait()
}

consumer 版本2

package kafkaPlugin
import (
    "fmt"
    "github.com/Shopify/sarama"
)

type KafkaConsumer struct {
    Node string
    Topic string
    //Message string
    MessageQueue chan string
}

func (this KafkaConsumer) Consume(){
    consumer, err := sarama.NewConsumer([]string{this.Node}, nil)
    if err != nil {
        fmt.Printf("kafka connnet failed, error[%v]", err.Error())
        return
    }
    defer consumer.Close()

    partitions, err := consumer.Partitions(this.Topic)
    if err != nil {
        fmt.Printf("get topic failed, error[%v]", err.Error())
        return
    }
    for _, p := range partitions {
        partitionConsumer, err := consumer.ConsumePartition(this.Topic, p, sarama.OffsetNewest)
        if err != nil {
            fmt.Printf("get partition consumer failed, error[%v]", err.Error())
            continue
        }

        for message := range partitionConsumer.Messages() {
            fmt.Printf("message:[%v], key:[%v], offset:[%v]\n", string(message.Value), string(message.Key), string(message.Offset))
            this.MessageQueue <- string(message.Value)
        }
    }
}

func main(){
    var kafkaConsumer = KafkaConsumer{
        Node: "10.10.4.35:9092",
        Topic: "cctv1",
    }
    kafkaConsumer.Consume()
}

上述代码执行起来，就会开启 kafka 消费者持续监听，然后通过 kafka 自带的生产者终端发送 2 条测试数据，消费结果如下：

windows 环境，运行编译错误：exec: "gcc": executable file not found in %PATH%

问题处理请参考下面的链接：

https://blog.csdn.net/myBarbara/article/details/95358694

https://www.cnblogs.com/ggg-327931457/p/9694516.html

ending ~