目录

1、生产者

2、消费者

1、生产者

/* producer */

package main

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

// go mod init
// go get
// 基于sarama第三方库开发的kafka client

func main() {
	//初始化配置
	config := sarama.NewConfig()
	config.Producer.RequiredAcks = sarama.WaitForAll          // 发送完数据需要leader和follow都确认
	config.Producer.Partitioner = sarama.NewRandomPartitioner // 随机分配分区 partition
	config.Producer.Return.Successes = true                   // 成功交付的消息将在success channel返回

	fmt.Println(111)

	// 创建生产者，连接kafka
	client, err := sarama.NewSyncProducer([]string{"192.168.0.113:9092"}, config)
	if err != nil {
		fmt.Println("producer closed, err:", err)
		return
	}
	defer client.Close()
	fmt.Println(222)

	for i := 0; i < 5; i++ {
		// 构造一个消息
		msg := &sarama.ProducerMessage{}
		msg.Topic = "web_log"
		msg.Value = sarama.StringEncoder("this is a test log" + strconv.Itoa(i))

		fmt.Println(333)

		// 发送消息
		pid, offset, err := client.SendMessage(msg)
		if err != nil {
			fmt.Println("send msg failed, err:", err)
			return
		}
		fmt.Printf("pid:%v offset:%v\n", pid, offset)           //分区id，偏移id

		time.Sleep(2 * time.Second)
	}
}

2、消费者

/* consumer */

package main

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

var wg sync.WaitGroup

func main() {
	//创建消费者
	consumer, err := sarama.NewConsumer([]string{"192.168.0.113:9092"}, nil)
	if err != nil {
		fmt.Printf("fail to start consumer, err:%v\n", err)
		return
	}

	//获取主题分区
	partitionList, err := consumer.Partitions("web_log") // 根据topic取到所有的分区
	if err != nil {
		fmt.Printf("fail to get list of partition:err%v\n", err)
		return
	}
	fmt.Println(partitionList)

	//遍历分区
	for partition := range partitionList {
		// 针对每个分区创建一个对应的分区消费者
		pc, err := consumer.ConsumePartition("web_log", int32(partition), sarama.OffsetNewest)
		//pc, err := consumer.ConsumePartition("web_log", int32(partition), 90)
		if err != nil {
			fmt.Printf("failed to start consumer for partition %d,err:%v\n", partition, err)
			return
		}
		defer pc.AsyncClose()

		// 异步从每个分区消费信息
		wg.Add(1)   //+1
		go func(sarama.PartitionConsumer) {
			defer wg.Done()   //-1
			for msg := range pc.Messages() {
				fmt.Printf("Partition:%d Offset:%d Key:%v Value:%s\n", msg.Partition, msg.Offset, msg.Key, msg.Value)
			}
		}(pc)
	}
	wg.Wait()  //
}