110 lines
2.8 KiB
Go
110 lines
2.8 KiB
Go
|
// Copyright 2011 Google Inc. All rights reserved.
|
||
|
|
// Use of this source code is governed by the Apache 2.0
|
||
|
|
// license that can be found in the LICENSE file.
|
||
|
|
|
||
|
|
// This example only works on App Engine "flexible environment".
|
||
|
|
// +build !appengine
|
||
|
|
|
||
|
|
package main
|
||
|
|
|
||
|
|
import (
|
||
|
|
"html/template"
|
||
|
|
"net/http"
|
||
|
|
"time"
|
||
|
|
|
||
|
|
"golang.org/x/net/context"
|
||
|
|
|
||
|
|
"google.golang.org/appengine"
|
||
|
|
"google.golang.org/appengine/datastore"
|
||
|
|
"google.golang.org/appengine/log"
|
||
|
|
"google.golang.org/appengine/user"
|
||
|
|
)
|
||
|
|
|
||
|
|
var initTime time.Time
|
||
|
|
|
||
|
|
type Greeting struct {
|
||
|
|
Author string
|
||
|
|
Content string
|
||
|
|
Date time.Time
|
||
|
|
}
|
||
|
|
|
||
|
|
func main() {
|
||
|
|
http.HandleFunc("/", handleMainPage)
|
||
|
|
http.HandleFunc("/sign", handleSign)
|
||
|
|
appengine.Main()
|
||
|
|
}
|
||
|
|
|
||
|
|
// guestbookKey returns the key used for all guestbook entries.
|
||
|
|
func guestbookKey(ctx context.Context) *datastore.Key {
|
||
|
|
// The string "default_guestbook" here could be varied to have multiple guestbooks.
|
||
|
|
return datastore.NewKey(ctx, "Guestbook", "default_guestbook", 0, nil)
|
||
|
|
}
|
||
|
|
|
||
|
|
var tpl = template.Must(template.ParseGlob("templates/*.html"))
|
||
|
|
|
||
|
|
func handleMainPage(w http.ResponseWriter, r *http.Request) {
|
||
|
|
if r.Method != "GET" {
|
||
|
|
http.Error(w, "GET requests only", http.StatusMethodNotAllowed)
|
||
|
|
return
|
||
|
|
}
|
||
|
|
if r.URL.Path != "/" {
|
||
|
|
http.NotFound(w, r)
|
||
|
|
return
|
||
|
|
}
|
||
|
|
|
||
|
|
ctx := appengine.NewContext(r)
|
||
|
|
tic := time.Now()
|
||
|
|
q := datastore.NewQuery("Greeting").Ancestor(guestbookKey(ctx)).Order("-Date").Limit(10)
|
||
|
|
var gg []*Greeting
|
||
|
|
if _, err := q.GetAll(ctx, &gg); err != nil {
|
||
|
|
http.Error(w, err.Error(), http.StatusInternalServerError)
|
||
|
|
log.Errorf(ctx, "GetAll: %v", err)
|
||
|
|
return
|
||
|
|
}
|
||
|
|
log.Infof(ctx, "Datastore lookup took %s", time.Since(tic).String())
|
||
|
|
log.Infof(ctx, "Rendering %d greetings", len(gg))
|
||
|
|
|
||
|
|
var email, logout, login string
|
||
|
|
if u := user.Current(ctx); u != nil {
|
||
|
|
logout, _ = user.LogoutURL(ctx, "/")
|
||
|
|
email = u.Email
|
||
|
|
} else {
|
||
|
|
login, _ = user.LoginURL(ctx, "/")
|
||
|
|
}
|
||
|
|
data := struct {
|
||
|
|
Greetings []*Greeting
|
||
|
|
Login, Logout, Email string
|
||
|
|
}{
|
||
|
|
Greetings: gg,
|
||
|
|
Login: login,
|
||
|
|
Logout: logout,
|
||
|
|
Email: email,
|
||
|
|
}
|
||
|
|
w.Header().Set("Content-Type", "text/html; charset=utf-8")
|
||
|
|
if err := tpl.ExecuteTemplate(w, "guestbook.html", data); err != nil {
|
||
|
|
log.Errorf(ctx, "%v", err)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
func handleSign(w http.ResponseWriter, r *http.Request) {
|
||
|
|
if r.Method != "POST" {
|
||
|
|
http.Error(w, "POST requests only", http.StatusMethodNotAllowed)
|
||
|
|
return
|
||
|
|
}
|
||
|
|
ctx := appengine.NewContext(r)
|
||
|
|
g := &Greeting{
|
||
|
|
Content: r.FormValue("content"),
|
||
|
|
Date: time.Now(),
|
||
|
|
}
|
||
|
|
if u := user.Current(ctx); u != nil {
|
||
|
|
g.Author = u.String()
|
||
|
|
}
|
||
|
|
key := datastore.NewIncompleteKey(ctx, "Greeting", guestbookKey(ctx))
|
||
|
|
if _, err := datastore.Put(ctx, key, g); err != nil {
|
||
|
|
http.Error(w, err.Error(), http.StatusInternalServerError)
|
||
|
|
return
|
||
|
|
}
|
||
|
|
// Redirect with 303 which causes the subsequent request to use GET.
|
||
|
|
http.Redirect(w, r, "/", http.StatusSeeOther)
|
||
|
|
}
|