github.com/varialus/godfly@v0.0.0-20130904042352-1934f9f095ab/doc/articles/wiki/final-noerror.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  	"net/http"
    11  )
    12  
    13  type Page struct {
    14  	Title string
    15  	Body  []byte
    16  }
    17  
    18  func (p *Page) save() error {
    19  	filename := p.Title + ".txt"
    20  	return ioutil.WriteFile(filename, p.Body, 0600)
    21  }
    22  
    23  func loadPage(title string) (*Page, error) {
    24  	filename := title + ".txt"
    25  	body, err := ioutil.ReadFile(filename)
    26  	if err != nil {
    27  		return nil, err
    28  	}
    29  	return &Page{Title: title, Body: body}, nil
    30  }
    31  
    32  const lenPath = len("/view/")
    33  
    34  func editHandler(w http.ResponseWriter, r *http.Request) {
    35  	title := r.URL.Path[lenPath:]
    36  	p, err := loadPage(title)
    37  	if err != nil {
    38  		p = &Page{Title: title}
    39  	}
    40  	t, _ := template.ParseFiles("edit.html")
    41  	t.Execute(w, p)
    42  }
    43  
    44  func viewHandler(w http.ResponseWriter, r *http.Request) {
    45  	title := r.URL.Path[lenPath:]
    46  	p, _ := loadPage(title)
    47  	t, _ := template.ParseFiles("view.html")
    48  	t.Execute(w, p)
    49  }
    50  
    51  func main() {
    52  	http.HandleFunc("/view/", viewHandler)
    53  	http.HandleFunc("/edit/", editHandler)
    54  	http.ListenAndServe(":8080", nil)
    55  }