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package main
import (
"fmt"
"io/ioutil"
"log"
"net/http"
"os"
kafka "github.com/segmentio/kafka-go"
)
func producerHandler(kafkaWriter *kafka.Writer) func(http.ResponseWriter, *http.Request) {
return http.HandlerFunc(func(wrt http.ResponseWriter, req *http.Request) {
body, err := ioutil.ReadAll(req.Body)
if err != nil {
log.Fatalln(err)
}
msg := kafka.Message{
Key: []byte(fmt.Sprintf("address-%s", req.RemoteAddr)),
Value: body,
}
err = kafkaWriter.WriteMessages(req.Context(), msg)
if err != nil {
wrt.Write([]byte(err.Error()))
log.Fatalln(err)
}
})
}
func getKafkaWriter(kafkaURL, topic string) *kafka.Writer {
return &kafka.Writer{
Addr: kafka.TCP(kafkaURL),
Topic: topic,
Balancer: &kafka.LeastBytes{},
}
}
func main() {
// get kafka writer using environment variables.
kafkaURL := os.Getenv("kafkaURL")
topic := os.Getenv("topic")
kafkaWriter := getKafkaWriter(kafkaURL, topic)
defer kafkaWriter.Close()
// Add handle func for producer.
http.HandleFunc("/", producerHandler(kafkaWriter))
// Run the web server.
fmt.Println("start producer-api ... !!")
log.Fatal(http.ListenAndServe(":8080", nil))
}
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