birowo/routerLikeGraphQL.go

## routerLikeGraphQL.go
package main

import (
	"encoding/json"
	"math"
	"net/http"
	"net/url"
	"strconv"
	"strings"

	"github.com/julienschmidt/httprouter"
)

type Hitung struct {
	Kali  float64 `json:"kali,omitempty"`
	Bagi  float64 `json:"bagi,omitempty"`
	Plus  float64 `json:"plus,omitempty"`
	Minus float64 `json:"minus,omitempty"`
}
type Lingkaran struct {
	Keliling float64 `json:"keliling,omitempty"`
	Luas     float64 `json:"luas,omitempty"`
}
type Bola struct {
	Luas float64 `json:"luas,omitempty"`
	Isi  float64 `json:"isi,omitempty"`
}

var hostPage = []byte(`
<html>
<head></head>
<body>
	queries:<br>
	<textarea id="qs_"></textarea><br>
	<button onclick="getJSON('/?query='+qr.query(qs_.value), qr.result)">submit</button><br>
	<br>
	response:<br>
	<textarea id="rs_"></textarea>
	<script>
	function getJSON(url, cb){
		//alert(url)
		var xhr = new XMLHttpRequest();
		xhr.onreadystatechange = function() {
		  if (this.readyState == 4 && this.status == 200){
				//alert(this.responseText)
				if(this.getResponseHeader('Content-Type')=='application/json') cb(JSON.parse(this.responseText))
				else alert('error: response must json')
			}
		}
		xhr.open('GET', url);
		xhr.send();
	}
	var qr = (function(rs_){
		var keys
		return {
			query: function(qs){
				qs = qs.replace(/^\s+|\s+$/g, '').replace(/\s+/g, '|')
				keys = qs.split('|')
				return qs
			},
			result: function(vals){
				var json={}
				for(var i=0; i<vals.length; i++){
					json[keys[i].split('?')[0]]=vals[i]
				}
				rs_.value = JSON.stringify(json, null, '. ')
			}
		}
	})(rs_)
	</script>
</body>
</html>
`)

func main() {
	r1 := httprouter.New()
	r1.GET("/hitung/angka1/:angka1/angka2/:angka2", func(w http.ResponseWriter, r *http.Request, p httprouter.Params) {
		angka1, _ := strconv.ParseFloat(p.ByName("angka1"), 64)
		angka2, _ := strconv.ParseFloat(p.ByName("angka2"), 64)
		prop := strings.Split(r.URL.Query().Get("prop"), ",")
		hitung := &Hitung{}
		for _, field := range prop {
			switch field {
			case "plus":
				hitung.Plus = angka1 + angka2
			case "minus":
				hitung.Minus = angka1 - angka2
			case "kali":
				hitung.Kali = angka1 * angka2
			case "bagi":
				hitung.Bagi = angka1 / angka2
			}
		}
		//println("hitung")
		json.NewEncoder(w).Encode(hitung)
	})
	r1.GET("/lingkaran/radius/:radius", func(w http.ResponseWriter, r *http.Request, p httprouter.Params) {
		radius, _ := strconv.ParseFloat(p.ByName("radius"), 64)
		prop := strings.Split(r.URL.Query().Get("prop"), ",")
		lingkaran := &Lingkaran{}
		for _, field := range prop {
			switch field {
			case "keliling":
				lingkaran.Keliling = 2 * math.Pi * radius
			case "luas":
				lingkaran.Luas = math.Pi * radius * radius
			}
		}
		//println("lingkaran")
		json.NewEncoder(w).Encode(lingkaran)
	})
	r1.GET("/bola/radius/:radius", func(w http.ResponseWriter, r *http.Request, p httprouter.Params) {
		radius, _ := strconv.ParseFloat(p.ByName("radius"), 64)
		prop := strings.Split(r.URL.Query().Get("prop"), ",")
		bola := &Bola{}
		for _, field := range prop {
			switch field {
			case "luas":
				bola.Luas = 4 * math.Pi * radius * radius
			case "isi":
				bola.Isi = (4 / 3) * math.Pi * radius * radius * radius
			}
		}
		//println("bola")
		json.NewEncoder(w).Encode(bola)
	})

	http.ListenAndServe(":8080", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		query := r.URL.Query()
		if len(query) == 0 {
			w.Header().Set("Content-Type", "text/html")
			w.Write(hostPage)
			return
		}
		for k, v := range query {
			switch k {
			case "query":
				urls := strings.Split(v[0], "|")
				i, n := 0, len(urls)
				w.Header().Set("Content-Type", "application/json")
				w.Write([]byte("["))
				for i < n {
					r.URL, _ = url.Parse(urls[i])
					//println(r.URL.Path)
					i++
					h, p, _ := r1.Lookup(r.Method, r.URL.Path)
					if h != nil {
						h(w, r, p)
						if i < n {
							w.Write([]byte(","))
						}
					}
				}
				w.Write([]byte("]"))
				return
			default:
				http.Error(w, "resource not found", http.StatusNotFound)
			}
		}
	}))
}

## screenshot.md

      
    Raw
  

              screenshot.md
            
          
    beberapa contoh query:
	package main

	import (
	"encoding/json"
	"math"
	"net/http"
	"net/url"
	"strconv"
	"strings"

	"github.com/julienschmidt/httprouter"
	)

	type Hitung struct {
	Kali float64 `json:"kali,omitempty"`
	Bagi float64 `json:"bagi,omitempty"`
	Plus float64 `json:"plus,omitempty"`
	Minus float64 `json:"minus,omitempty"`
	}
	type Lingkaran struct {
	Keliling float64 `json:"keliling,omitempty"`
	Luas float64 `json:"luas,omitempty"`
	}
	type Bola struct {
	Luas float64 `json:"luas,omitempty"`
	Isi float64 `json:"isi,omitempty"`
	}

	var hostPage = []byte(`
	<html>
	<head></head>
	<body>
	queries:<br>
	<textarea id="qs_"></textarea><br>
	<button onclick="getJSON('/?query='+qr.query(qs_.value), qr.result)">submit</button><br>
	<br>
	response:<br>
	<textarea id="rs_"></textarea>
	<script>
	function getJSON(url, cb){
	//alert(url)
	var xhr = new XMLHttpRequest();
	xhr.onreadystatechange = function() {
	if (this.readyState == 4 && this.status == 200){
	//alert(this.responseText)
	if(this.getResponseHeader('Content-Type')=='application/json') cb(JSON.parse(this.responseText))
	else alert('error: response must json')
	}
	}
	xhr.open('GET', url);
	xhr.send();
	}
	var qr = (function(rs_){
	var keys
	return {
	query: function(qs){
	qs = qs.replace(/^\s+\|\s+$/g, '').replace(/\s+/g, '\|')
	keys = qs.split('\|')
	return qs
	},
	result: function(vals){
	var json={}
	for(var i=0; i<vals.length; i++){
	json[keys[i].split('?')[0]]=vals[i]
	}
	rs_.value = JSON.stringify(json, null, '. ')
	}
	}
	})(rs_)
	</script>
	</body>
	</html>
	`)

	func main() {
	r1 := httprouter.New()
	r1.GET("/hitung/angka1/:angka1/angka2/:angka2", func(w http.ResponseWriter, r *http.Request, p httprouter.Params) {
	angka1, _ := strconv.ParseFloat(p.ByName("angka1"), 64)
	angka2, _ := strconv.ParseFloat(p.ByName("angka2"), 64)
	prop := strings.Split(r.URL.Query().Get("prop"), ",")
	hitung := &Hitung{}
	for _, field := range prop {
	switch field {
	case "plus":
	hitung.Plus = angka1 + angka2
	case "minus":
	hitung.Minus = angka1 - angka2
	case "kali":
	hitung.Kali = angka1 * angka2
	case "bagi":
	hitung.Bagi = angka1 / angka2
	}
	}
	//println("hitung")
	json.NewEncoder(w).Encode(hitung)
	})
	r1.GET("/lingkaran/radius/:radius", func(w http.ResponseWriter, r *http.Request, p httprouter.Params) {
	radius, _ := strconv.ParseFloat(p.ByName("radius"), 64)
	prop := strings.Split(r.URL.Query().Get("prop"), ",")
	lingkaran := &Lingkaran{}
	for _, field := range prop {
	switch field {
	case "keliling":
	lingkaran.Keliling = 2 * math.Pi * radius
	case "luas":
	lingkaran.Luas = math.Pi * radius * radius
	}
	}
	//println("lingkaran")
	json.NewEncoder(w).Encode(lingkaran)
	})
	r1.GET("/bola/radius/:radius", func(w http.ResponseWriter, r *http.Request, p httprouter.Params) {
	radius, _ := strconv.ParseFloat(p.ByName("radius"), 64)
	prop := strings.Split(r.URL.Query().Get("prop"), ",")
	bola := &Bola{}
	for _, field := range prop {
	switch field {
	case "luas":
	bola.Luas = 4 * math.Pi * radius * radius
	case "isi":
	bola.Isi = (4 / 3) * math.Pi * radius * radius * radius
	}
	}
	//println("bola")
	json.NewEncoder(w).Encode(bola)
	})

	http.ListenAndServe(":8080", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
	query := r.URL.Query()
	if len(query) == 0 {
	w.Header().Set("Content-Type", "text/html")
	w.Write(hostPage)
	return
	}
	for k, v := range query {
	switch k {
	case "query":
	urls := strings.Split(v[0], "\|")
	i, n := 0, len(urls)
	w.Header().Set("Content-Type", "application/json")
	w.Write([]byte("["))
	for i < n {
	r.URL, _ = url.Parse(urls[i])
	//println(r.URL.Path)
	i++
	h, p, _ := r1.Lookup(r.Method, r.URL.Path)
	if h != nil {
	h(w, r, p)
	if i < n {
	w.Write([]byte(","))
	}
	}
	}
	w.Write([]byte("]"))
	return
	default:
	http.Error(w, "resource not found", http.StatusNotFound)
	}
	}
	}))
	}