example.go

package main

import (
	"net/http"
	"log"
	"os"
	"encoding/json"
)

type translateRequestSchema struct {
	Text string
	FromLang string			`json:"from_lang"`
	ToLang	string			`json:"to_lang"`
}

type translateResponseSchema struct {
	Text string				`json:"text"`
}

func translateText(text, from, to string) (string, error) {
	return  text, nil
}

func translateHandler(writer http.ResponseWriter, request *http.Request) {

	var (
		t translateRequestSchema
		response []byte
	)

	// set content type
	writer.Header().Set("Content-Type", "application/json")

	// start decode request
	decoder := json.NewDecoder(request.Body)
	if err := decoder.Decode(&t); err != nil {
		http.Error(writer, err.Error(), http.StatusBadRequest)
		return
	}

	// translate text
	text, err := translateText(t.Text, t.FromLang, t.ToLang)
	var result = &translateResponseSchema{
		Text: text,
	}

	if response, err = json.Marshal(result); err != nil{
		http.Error(writer, err.Error(), http.StatusInternalServerError)
		return
	}

	// result
	writer.Write(response)
	writer.WriteHeader(http.StatusOK)
	return
}

func main() {
	http.HandleFunc("/api/translate", translateHandler)

	log.Printf("Start server on port 8080", )

	// runserver
	if err := http.ListenAndServe(":8000", nil); err != nil{
		log.Println(err)
		os.Exit(1)
	}
}