Go操作Kafka
目錄
- sarama
- 連接kafka發送消息
- 連接kafka消費消息
- Kafka是一種高吞吐量的分佈式發佈訂閱消息系統,它可以處理消費者規模的網站中的所有動作流數據,具有高性能、持久化、多副本備份、橫向擴展等特點。本文介紹瞭如何使用Go語言發送和接收kafka消息。
1. sarama
- Go語言中連接kafka使用第三方庫:github.com/Shopify/sarama。
1. 下載及安裝
go get github.com/Shopify/sarama
2. 注意事項
- sarama v1.20之後的版本加入了zstd壓縮算法,需要用到cgo,在Windows平臺編譯時會提示類似如下錯誤:
# github.com/DataDog/zstd
exec: "gcc":executable file not found in %PATH%
2. 連接kafka發送消息
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
msg := &sarama.ProducerMessage{}
msg.Topic = "web_log"
msg.Value = sarama.StringEncoder("this is a test log")
client, err := sarama.NewSyncProducer([]string{"192.168.1.7:9092"}, config)
if err != nil {
fmt.Println("producer closed, err:", err)
return
}
defer client.Close()
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)
}
3. 連接kafka消費消息
package main
import (
"fmt"
"github.com/Shopify/sarama"
)
func main() {
consumer, err := sarama.NewConsumer([]string{"127.0.0.1:9092"}, nil)
if err != nil {
fmt.Printf("fail to start consumer, err:%v\n", err)
return
}
partitionList, err := consumer.Partitions("web_log")
if err != nil {
fmt.Printf("fail to get list of partition:err%v\n", err)
return
}
fmt.Println(partitionList)
for partition := range partitionList {
pc, err := consumer.ConsumePartition("web_log", int32(partition), sarama.OffsetNewest)
if err != nil {
fmt.Printf("failed to start consumer for partition %d,err:%v\n", partition, err)
return
}
defer pc.AsyncClose()
go func(sarama.PartitionConsumer) {
for msg := range pc.Messages() {
fmt.Printf("Partition:%d Offset:%d Key:%v Value:%v", msg.Partition, msg.Offset, msg.Key, msg.Value)
}
}(pc)
}
}