Kafka 安裝配置、更多資料請(qǐng)參考其官網(wǎng)。

啟動(dòng) kafka server

在這之前需要啟動(dòng) zookeeper 做服務(wù)治理（單機(jī)）。

$ bin/zkServer.sh status conf/zoo_sample.cfg

如提示權(quán)限限制加上 sudo 。

啟動(dòng) kafka server

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

啟動(dòng)消息隊(duì)列(本部分僅為測(cè)試 server)

新建 Topic

$ bin/kafka-topics.sh --create --zookeeper localhost:2181 --replication-factor 1 --partitions 1 --topic test

$ bin/kafka-topics.sh --list --zookeeper localhost:2181 (test)

1. 啟動(dòng) Producer

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

2. 啟動(dòng) Consumer

bin/kafka-console-consumer.sh --zookeeper localhost:2181 --topic test --from-beginning

此時(shí)在 Producer 端發(fā)送消息，在 Consumer 就會(huì)顯示，如下圖所示。

（上圖中 Consumer 多出了好幾個(gè)消息是我截圖之前測(cè)試發(fā)出的）

Action

本文使用 sarama 庫(kù)作為 kafka 的 go API。sarama 庫(kù)沒(méi)有給出很具體的文檔，可以參考其源碼。

Producer

package main

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

func main() {
    config := sarama.NewConfig()
    config.Producer.RequiredAcks = sarama.WaitForAll
    config.Producer.Partitioner = sarama.NewRandomPartitioner
    config.Producer.Return.Successes = true

    addr := []string{"localhost:9092"}

    producer, err := sarama.NewSyncProducer(addr, config)
    if err != nil {
        panic(err)
    }

    defer producer.Close()

    msg := &sarama.ProducerMessage{
        Topic:     "hello",
        Partition: int32(-1),
        Key:       sarama.StringEncoder("key"),
    }

    var value string
    for {
        _, err := fmt.Scanf("%s", &value)
        if err != nil {
            break
        }
        msg.Value = sarama.ByteEncoder(value)
        fmt.Println(value)

        partition, offset, err := producer.SendMessage(msg)
        if err != nil {
            fmt.Println("Send message Fail")
        }
        fmt.Printf("Partition = %d, offset=%d\n", partition, offset)
    }
}

Consumer

package main

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

var (
    wg  sync.WaitGroup
)

func main() {
    consumer, err := sarama.NewConsumer([]string{"localhost:9092"}, nil)
    if err != nil {
        panic(err)
    }

    partitionList, err := consumer.Partitions("hello")
    if err != nil {
        panic(err)
    }

    for partition := range partitionList {
        pc, err := consumer.ConsumePartition("hello", int32(partition), sarama.OffsetNewest)
        if err != nil {
            panic(err)
        }

        defer pc.AsyncClose()

        wg.Add(1)

        go func(sarama.PartitionConsumer) {
            defer wg.Done()
            for msg := range pc.Messages() {
                fmt.Printf("Partition:%d, Offset:%d, Key:%s, Value:%s\n", msg.Partition, msg.Offset, string(msg.Key), string(msg.Value))
            }

        }(pc)
    }
    wg.Wait()
    consumer.Close()
}

結(jié)果如下：