Created
July 11, 2011 13:30
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Go Lang app engine sample
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| // 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. | |
| package guestbook | |
| import ( | |
| "http" | |
| "io" | |
| "os" | |
| "template" | |
| "time" | |
| "appengine" | |
| "appengine/datastore" | |
| "appengine/user" | |
| ) | |
| type Greeting struct { | |
| Author string | |
| Content string | |
| Date datastore.Time | |
| } | |
| func serve404(w http.ResponseWriter) { | |
| w.WriteHeader(http.StatusNotFound) | |
| w.Header().Set("Content-Type", "text/plain; charset=utf-8") | |
| io.WriteString(w, "Not Found") | |
| } | |
| func serveError(c appengine.Context, w http.ResponseWriter, err os.Error) { | |
| w.WriteHeader(http.StatusInternalServerError) | |
| w.Header().Set("Content-Type", "text/plain; charset=utf-8") | |
| io.WriteString(w, "Internal Server Error") | |
| c.Errorf("%v", err) | |
| } | |
| var mainPage = template.MustParse(`<html><body> | |
| {.repeated section @} | |
| {.section Author}<b>{@|html}</b>{.or}An anonymous person{.end} | |
| wrote <blockquote>{Content|html}</blockquote> | |
| {.end} | |
| <form action="/sign" method="post"> | |
| <div><textarea name="content" rows="3" cols="60"></textarea></div> | |
| <div><input type="submit" value="Sign Guestbook"></div> | |
| </form></body></html>`, | |
| nil) | |
| func handleMainPage(w http.ResponseWriter, r *http.Request) { | |
| if r.Method != "GET" || r.URL.Path != "/" { | |
| serve404(w) | |
| return | |
| } | |
| c := appengine.NewContext(r) | |
| q := datastore.NewQuery("Greeting").Order("-Date").Limit(10) | |
| var gg []*Greeting | |
| _, err := q.GetAll(c, &gg) | |
| if err != nil { | |
| serveError(c, w, err) | |
| return | |
| } | |
| w.Header().Set("Content-Type", "text/html; charset=utf-8") | |
| if err := mainPage.Execute(w, gg); err != nil { | |
| c.Errorf("%v", err) | |
| } | |
| } | |
| func handleSign(w http.ResponseWriter, r *http.Request) { | |
| if r.Method != "POST" { | |
| serve404(w) | |
| return | |
| } | |
| c := appengine.NewContext(r) | |
| if err := r.ParseForm(); err != nil { | |
| serveError(c, w, err) | |
| return | |
| } | |
| g := &Greeting{ | |
| Content: r.FormValue("content"), | |
| Date: datastore.SecondsToTime(time.Seconds()), | |
| } | |
| if u := user.Current(c); u != nil { | |
| g.Author = u.String() | |
| } | |
| if _, err := datastore.Put(c, datastore.NewIncompleteKey("Greeting"), g); err != nil { | |
| serveError(c, w, err) | |
| return | |
| } | |
| http.Redirect(w, r, "/", http.StatusFound) | |
| } | |
| func init() { | |
| http.HandleFunc("/", handleMainPage) | |
| http.HandleFunc("/sign", handleSign) | |
| } |
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