Shorten Endpoint

Qisqartirish endpoint'i

Endi qurgan ikkita qismni (Store va CodeGenerator) birlashtirib, tashqi dunyo bilan "gaplashadigan" birinchi HTTP endpoint'ni yasaymiz: foydalanuvchi uzun havolani yuborsa, server unga qisqa kodni qaytarishi kerak.

example.go

package main

import (
	"encoding/json"
	"fmt"
	"net/http"
	"net/http/httptest"
)

type ShortenRequest struct {
	URL string `json:"url"`
}

type ShortenResponse struct {
	Code string `json:"code"`
}

func makeShortenHandler(gen *CodeGenerator, store *Store) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		var req ShortenRequest
		if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
			w.WriteHeader(http.StatusBadRequest)
			return
		}

		code := gen.Next()
		store.Save(&URLRecord{Code: code, OriginalURL: req.URL})

		w.Header().Set("Content-Type", "application/json")
		json.NewEncoder(w).Encode(ShortenResponse{Code: code})
	}
}

func main() {
	gen := &CodeGenerator{}
	store := NewStore()
	handler := makeShortenHandler(gen, store)

	body := `{"url":"https://godasturchi.uz"}`
	req := httptest.NewRequest("POST", "/shorten", strings.NewReader(body))
	rec := httptest.NewRecorder()
	handler(rec, req)

	fmt.Println(rec.Body.String())
}

makeShortenHandler(gen, store) — "HTTP Service Communication" darsida ko'rgan "kerakli narsalarni parametr sifatida berish" naqshi: handler o'zi qayerdan CodeGenerator yoki Store olishini "bilmaydi", ular unga TASHQARIDAN beriladi. Bu — handler'ni testda (haqiqiy production server ishga tushirmasdan) sinash imkonini beradi, aynan shu misoldagi kabi.

json.NewDecoder(r.Body).Decode(&req) — "JSON Encoding" darsida ko'rgan so'rov tanasini ("body") to'g'ridan-to'g'ri Go struct'iga aylantirish usuli. Xato bo'lsa (masalan noto'g'ri JSON), http.StatusBadRequest (400) qaytariladi — bu "RESTful API Design" darsida ko'rgan "mos status kodni qaytarish" tamoyili.

>_ Exercise

Bo'sh URL yuborilganda xato qaytaruvchi tekshiruv qo'shing.

•makeShortenHandler ichida, req.URL bo'sh ("") bo'lsa, http.StatusBadRequest qaytaring va funksiyadan chiqing
•{"url":""} tanasi bilan so'rov yuborib, rec.Code qiymatini chop eting

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Key Takeaway

Key Takeaway:

Shorten endpoint — kiruvchi JSON so'rovni tekshiradi, noto'g'ri ma'lumot uchun mos xato kodini qaytaradi, va faqat to'g'ri ma'lumot uchun yangi qisqa kod yaratib, uni saqlaydi.

NEXT UP

Redirect Endpoint

OUTPUT

$ go run main.go
Kodingizni ishga tushiring