github.com/mattn/go@v0.0.0-20171011075504-07f7db3ea99f/doc/articles/wiki/part3.go (about)

     1  // Copyright 2010 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package main
     6  
     7  import (
     8  	"html/template"
     9  	"io/ioutil"
    10  	"log"
    11  	"net/http"
    12  )
    13  
    14  type Page struct {
    15  	Title string
    16  	Body  []byte
    17  }
    18  
    19  func (p *Page) save() error {
    20  	filename := p.Title + ".txt"
    21  	return ioutil.WriteFile(filename, p.Body, 0600)
    22  }
    23  
    24  func loadPage(title string) (*Page, error) {
    25  	filename := title + ".txt"
    26  	body, err := ioutil.ReadFile(filename)
    27  	if err != nil {
    28  		return nil, err
    29  	}
    30  	return &Page{Title: title, Body: body}, nil
    31  }
    32  
    33  func renderTemplate(w http.ResponseWriter, tmpl string, p *Page) {
    34  	t, _ := template.ParseFiles(tmpl + ".html")
    35  	t.Execute(w, p)
    36  }
    37  
    38  func viewHandler(w http.ResponseWriter, r *http.Request) {
    39  	title := r.URL.Path[len("/view/"):]
    40  	p, _ := loadPage(title)
    41  	renderTemplate(w, "view", p)
    42  }
    43  
    44  func editHandler(w http.ResponseWriter, r *http.Request) {
    45  	title := r.URL.Path[len("/edit/"):]
    46  	p, err := loadPage(title)
    47  	if err != nil {
    48  		p = &Page{Title: title}
    49  	}
    50  	renderTemplate(w, "edit", p)
    51  }
    52  
    53  func main() {
    54  	http.HandleFunc("/view/", viewHandler)
    55  	http.HandleFunc("/edit/", editHandler)
    56  	//http.HandleFunc("/save/", saveHandler)
    57  	log.Fatal(http.ListenAndServe(":8080", nil))
    58  }