duaner1634 2011-10-15 00:40
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Appengine Go开发服务器找不到模板包

I'm attempting to do the go appengine tutorial found here, but I can't complete the example that imports the template library. This is the example code I am trying:

package hello

import (
    "fmt"
    "http"
    "template"
)

func init() {
    http.HandleFunc("/", root)
    http.HandleFunc("/sign", sign)
}

func root(w http.ResponseWriter, r *http.Request) {
    fmt.Fprint(w, guestbookForm)
}

const guestbookForm = `
<html>
  <body>
    <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>
`

func sign(w http.ResponseWriter, r *http.Request) {
    err := signTemplate.Execute(w, r.FormValue("content"))
    if err != nil {
        http.Error(w, err.String(), http.StatusInternalServerError)
    }
}

var signTemplate = template.MustParse(signTemplateHTML, nil)

const signTemplateHTML = `
<html>
  <body>
    <p>You wrote:</p>
    <pre>{@|html}</pre>
  </body>
</html>
`

The error I am receiving is:

Compile error:
    /home/habitue/Programming/GoExamples/hello/hello.go:36: undefined: template.MustParse

My app.yaml is this:

application: helloworld
version: 1
runtime: go
api_version: 3

handlers:
- url: /.*
  script: _go_app

I've tried modifying the dev_appserver.py EXTRA_PATHS list to include the system version of Go's libraries, since I noticed the appengine lib folder did not include a template library, but to no avail. Here is my current EXTRA_PATHSwith my changes being the last two entries:

EXTRA_PATHS = [
  DIR_PATH
  ,os.path.join(DIR_PATH, 'lib', 'antlr3')
  ,os.path.join(DIR_PATH, 'lib', 'django_0_96')
  ,os.path.join(DIR_PATH, 'lib', 'fancy_urllib')
  ,os.path.join(DIR_PATH, 'lib', 'ipaddr')
  ,os.path.join(DIR_PATH, 'lib', 'protorpc')
      ,os.path.join(DIR_PATH, 'lib', 'webob')
  ,os.path.join(DIR_PATH, 'lib', 'yaml', 'lib')
  ,os.path.join(DIR_PATH, 'lib', 'simplejson')
  ,os.path.join(DIR_PATH, 'lib', 'google.appengine._internal.graphy')
  ,os.path.join('usr', 'lib', 'go', 'lib')
  ,os.path.join('usr', 'lib', 'go', 'pkg', 'linux_amd64')
]

At this point, I'm not really sure how to proceed. I can't seem to find anywhere online that mentions a similar problem. I'm using the 64bit linux version of the appengine Go SDK, and my OS is Arch Linux, if that is any help.

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2条回答 默认 最新

  • dongzhan1878 2011-10-15 19:06
    关注

    The sample is outdated starting with the SDK 1.5.5 update.

    Now it should look more or less like this:

    package main

import (
    "fmt"
    "http"
    "template"
)

func init() {
    http.HandleFunc("/", root)
    http.HandleFunc("/sign", sign)
}

func root(w http.ResponseWriter, r *http.Request) {
    fmt.Fprint(w, guestbookForm)
}

const guestbookForm = `
<html>
 <body>
  <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>
`

func sign(w http.ResponseWriter, r *http.Request) {
    err := signTemplate.Execute(w, r.FormValue("content"))
    if err != nil {
        http.Error(w, err.String(), http.StatusInternalServerError)
    }
}

var signTemplate = template.Must(template.New("SignIn").Parse(signTemplateHTML))

const signTemplateHTML = `
<html>
 <body>
  <p>You wrote:</p>
  <pre>{{.|html}}</pre>
 </body>
</html>`

    Notice the difference in call initializing var signTemplate and the template parameter in the signTemplateHTML variable, {{.|html}} instead of {@|html}.

    本回答被题主选为最佳回答 , 对您是否有帮助呢?
    评论
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