main.go

main.go

package main

import (
	"flag"
	"fmt"
	"log"
	"encoding/json"

	"github.com/valyala/fasthttp"
)

var (
	addr     = flag.String("addr", ":4000", "TCP address to listen to")
)

type Image struct {
	Url string `json:"url"`
	Featured bool `json:"featured"`
	Title string `json:"title"`
}

type Detail struct {
	Title string `json:"title"`
	Body string `json:"body"`
}

type Images []Image

type Details []Detail

type Product struct {
	Title string `json:"name"`
	Manufacturer string `json:"manufacturer"`
	Images Images `json:"images"`
	Details Details `json:"details"`
}

type Review struct {
	Author string `json:"author"`
	Comment string `json:"comment"`
	Rating float64 `json:"rating"`
}

type Reviews []Review

type Merchant struct {
	Name string `json:"name"`
	CompanyRegNumber string `json:"company_reg_number"`
	Rating float64 `json:"company_reg_number"`
	Reviews Reviews
}

type Pricing struct {
	Quantity int `json:"quantity"`
	OriginalPrice string `json:"original_price"`
	DiscountedPrice string `json:"discounted_price"`
}

type Response struct {
	Product Product `json:"product"`
	Merchant Merchant `json:"merchant"`
	Pricing Pricing `json:"pricing"`
}

func main() {
	flag.Parse()

	h := requestHandler

	if err := fasthttp.ListenAndServe(*addr, h); err != nil {
		log.Fatalf("Error in ListenAndServe: %s", err)
	}
}

func requestHandler(ctx *fasthttp.RequestCtx) {
	resp := Response{
		Product: Product{
			Title: "Playstation 4 Pro",
			Manufacturer: "Sony Entertainment",
			Images: Images{
				Image{Url: "https://unsplash.com/photos/uDXeC54RwV4", Featured: true, Title: "Playstation 4 Pro"},
			},
			Details: Details{
				Detail{Title: "USB Ports", Body: "2"},
			},
		},
		Merchant: Merchant{
			Name: "Gamepit Sdn Bhd",
			CompanyRegNumber: "1-337",
			Rating: 4.9,
			Reviews: Reviews{
				Review{Author: "Imran I", Comment: "Product received in a very good condition", Rating: 5.0},
				Review{Author: "Faiz M", Comment: "Subpar after sales service", Rating: 3.5},
				Review{Author: "Gaddafi R", Comment: "Friendly staff, help me compare the drone specs", Rating: 5.0},
				Review{Author: "Victor L", Comment: "Good product catalog", Rating: 5.0},
			},
		},
		Pricing: Pricing{
			Quantity: 1,
			OriginalPrice: "RM 1200.99",
			DiscountedPrice: "RM 1050.99",
		},
	}

	b, err := json.Marshal(resp)

	if err != nil {
		panic(err)
	}

	fmt.Fprintf(ctx, string(b))

	ctx.SetContentType("application/json; charset=utf-8")
}