Go 操作kafka包sarama

概述

sarama 是一个纯 Go 客户端库，用于处理 Apache Kafka（0.8 及更高版本）。它包括一个用于轻松生成和使用消息的高级 API，以及一个用于在高级 API 不足时控制线路上的字节的低级 API。

在github上stars上比较多（推荐）。

• 开源包：https://github.com/Shopify/sarama
• 文档地址：https://pkg.go.dev/github.com/shopify/sarama

闲话少叙，上示例

代码语言：txt复制

package main

import (
	"context"
	"fmt"
	"github.com/Shopify/sarama"
	"log"
	"os"
	"os/signal"
	"sync"
)

type consumerGroupHandler struct {
}

func (consumerGroupHandler) Setup(sarama.ConsumerGroupSession) error {
	return nil
}
func (consumerGroupHandler) Cleanup(sarama.ConsumerGroupSession) error { return nil }

// ConsumeClaim must start a consumer loop of ConsumerGroupClaim's Messages().
func (consumerGroupHandler) ConsumeClaim(session sarama.ConsumerGroupSession, claim sarama.ConsumerGroupClaim) error {
	for msg := range claim.Messages() {
		log.Printf("Message claimed: value = %s, timestamp = %v, topic = %s", msg.Value, msg.Timestamp, msg.Topic)
		session.MarkMessage(msg, "")
	}
	return nil
}

//消费者组
func SaramaConsumerGroup() {
	config := sarama.NewConfig()
	config.Consumer.Return.Errors = false
	config.Version = sarama.V0_10_2_0                     // specify appropriate version
	config.Consumer.Offsets.Initial = sarama.OffsetOldest // 未找到组消费位移的时候从哪边开始消费

	group, err := sarama.NewConsumerGroup([]string{"localhost:9092"}, "my-group", config)
	if err != nil {
		panic(err)
	}
	defer func() { _ = group.Close() }()

	// Track errors
	go func() {
		for err := range group.Errors() {
			fmt.Println("ERROR", err)
		}
	}()
	fmt.Println("Consumed start")
	// Iterate over consumer sessions.
	ctx := context.Background()
	for {
		topics := []string{"my_topic"}
		handler := consumerGroupHandler{}

		// `Consume` should be called inside an infinite loop, when a
		// server-side rebalance happens, the consumer session will need to be
		// recreated to get the new claims
		err := group.Consume(ctx, topics, handler)
		if err != nil {
			panic(err)
		}
	}
}

//消费者
func SaramaConsumer() {
	consumer, err := sarama.NewConsumer([]string{"localhost:9092"}, sarama.NewConfig())
	if err != nil {
		panic(err)
	}

	defer func() {
		if err := consumer.Close(); err != nil {
			log.Fatalln(err)
		}
	}()

	partitionConsumer, err := consumer.ConsumePartition("my_topic", 0, sarama.OffsetNewest)
	if err != nil {
		panic(err)
	}

	defer func() {
		if err := partitionConsumer.Close(); err != nil {
			log.Fatalln(err)
		}
	}()

	// Trap SIGINT to trigger a shutdown.
	signals := make(chan os.Signal, 1)
	signal.Notify(signals, os.Interrupt)

	consumed := 0
ConsumerLoop:
	for {
		select {
		case msg := <-partitionConsumer.Messages():
			log.Printf("Consumed message offset %dn", msg.Offset)
			consumed  
		case <-signals:
			break ConsumerLoop
		}
	}

	log.Printf("Consumed: %dn", consumed)
}

//异步生产者Goroutines
func SyncProducer() {
	config := sarama.NewConfig()
	config.Producer.Return.Successes = true
	config.Producer.Return.Errors = true
	producer, err := sarama.NewAsyncProducer([]string{"localhost:9092"}, config)
	if err != nil {
		panic(err)
	}

	// Trap SIGINT to trigger a graceful shutdown.
	signals := make(chan os.Signal, 1)
	signal.Notify(signals, os.Interrupt)

	var (
		wg                                  sync.WaitGroup
		enqueued, successes, producerErrors int
	)

	wg.Add(1)
	go func() {
		defer wg.Done()
		for range producer.Successes() {
			successes  
		}
	}()

	wg.Add(1)
	go func() {
		defer wg.Done()
		for err := range producer.Errors() {
			log.Println(err)
			producerErrors  
		}
	}()

ProducerLoop:
	for {
		message := &sarama.ProducerMessage{Topic: "my_topic", Value: sarama.StringEncoder("testing 456")}
		select {
		case producer.Input() <- message:
			enqueued  

		case <-signals:
			producer.AsyncClose() // Trigger a shutdown of the producer.
			break ProducerLoop
		}
	}

	wg.Wait()

	log.Printf("Successfully produced: %d; errors: %dn", successes, producerErrors)
}

//异步生产者Select
func SyncProducerSelect() {
	producer, err := sarama.NewAsyncProducer([]string{"localhost:9092"}, nil)
	if err != nil {
		panic(err)
	}

	defer func() {
		if err := producer.Close(); err != nil {
			log.Fatalln(err)
		}
	}()

	// Trap SIGINT to trigger a shutdown.
	signals := make(chan os.Signal, 1)
	signal.Notify(signals, os.Interrupt)

	var enqueued, producerErrors int
ProducerLoop:
	for {
		select {
		case producer.Input() <- &sarama.ProducerMessage{Topic: "my_topic", Key: nil, Value: sarama.StringEncoder("testing 123")}:
			enqueued  
		case err := <-producer.Errors():
			log.Println("Failed to produce message", err)
			producerErrors  
		case <-signals:
			break ProducerLoop
		}
	}
	log.Printf("Enqueued: %d; errors: %dn", enqueued, producerErrors)
}

//同步生产模式
func SaramaProducer() {
	producer, err := sarama.NewSyncProducer([]string{"localhost:9092"}, nil)
	if err != nil {
		log.Fatalln(err)
	}
	defer func() {
		if err := producer.Close(); err != nil {
			log.Fatalln(err)
		}
	}()

	msg := &sarama.ProducerMessage{Topic: "my_topic", Value: sarama.StringEncoder("testing 123")}
	partition, offset, err := producer.SendMessage(msg)
	if err != nil {
		log.Printf("FAILED to send message: %sn", err)
	} else {
		log.Printf("> message sent to partition %d at offset %dn", partition, offset)
	}

}

func main() {
	//生产者
	go SyncProducer()
	//go SaramaProducer()
	//go SyncProducerSelect()

	//消费者
	SaramaConsumerGroup()
	//SaramaConsumer()

}

links

代码语言：txt复制

https://pkg.go.dev/github.com/Shopify/sarama

代码语言：txt复制

https://github.com/Shopify/sarama

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