hassaku63 · October 24, 2021 08:32 · hassaku63 · Oct 24, 2021
diff --git a/main.go b/main.go
 package main

 import (
 	"log"
 	"net/http"
 	"sync"
 	"text/template"
 	"path/filepath"
 )

 type templateHandler struct {
 	once		sync.Once
 	filename	string
 	templ		*template.Template
 }

 func (t *templateHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	p := filepath.Join("templates", t.filename)
 	log.Println("filepath: ", p)
 	t.once.Do(func() {
 		// template.Must - エラー処理を省けるらしい？
 		t.templ = template.Must(template.ParseFiles(p))
 	})
 	t.templ.Execute(w, nil)  // 本来は戻り値をチェックすべき. err をつけるべき? それとも panic?
 }

 func handler(w http.ResponseWriter, r *http.Request) {
 	w.Write([]byte(`<html>
 <head>
 	<title>chat</title>
 </head>
 <body>
 	body
 </body>
 </html>`))
 }

 func main() {
 	t := templateHandler{filename: "index.html"}
 	// handlers
 	http.HandleFunc("/", handler)
 	http.Handle("/render", &t)

 	if err := http.ListenAndServe(":8080", nil); err != nil {
 		log.Fatal("ListenAndSreve:", err)
 	}
 }
	package main

	import (
	"log"
	"net/http"
	"sync"
	"text/template"
	"path/filepath"
	)

	type templateHandler struct {
	once sync.Once
	filename string
	templ *template.Template
	}

	func (t templateHandler) ServeHTTP(w http.ResponseWriter, r http.Request) {
	p := filepath.Join("templates", t.filename)
	log.Println("filepath: ", p)
	t.once.Do(func() {
	// template.Must - エラー処理を省けるらしい？
	t.templ = template.Must(template.ParseFiles(p))
	})
	t.templ.Execute(w, nil) // 本来は戻り値をチェックすべき. err をつけるべき? それとも panic?
	}

	func handler(w http.ResponseWriter, r *http.Request) {
	w.Write([]byte(`<html>
	<head>
	<title>chat</title>
	</head>
	<body>
	body
	</body>
	</html>`))
	}

	func main() {
	t := templateHandler{filename: "index.html"}
	// handlers
	http.HandleFunc("/", handler)
	http.Handle("/render", &t)

	if err := http.ListenAndServe(":8080", nil); err != nil {
	log.Fatal("ListenAndSreve:", err)
	}
	}