Silverlight 上的 Google App Engine答案

【问题标题】：Google App Engine on SilverlightSilverlight 上的 Google App Engine
【发布时间】：2009-03-19 22:12:42
【问题描述】：

有没有关于如何使用 Silverlight 的 Google App Engine 的好例子，最好不要编写自定义网络服务？

干杯

尼克

【问题讨论】：

标签： silverlight google-app-engine

【解决方案1】：

这是我的方法主要基于Scott Seely's post 只需传递 XML，.xap 也由 GAE 提供服务。我昨天才开始工作，所以它仍在进行中。

谷歌：

app.yaml

    application: wowbosscards
version: 1
runtime: python
api_version: 1

handlers:
- url: /WowBossCards.html
  static_files: WowBossCards.html
  upload: WowBossCards.html
  mime_type: text/html
- url: /clientaccesspolicy.xml
  static_files: clientaccesspolicy.xml
  upload: clientaccesspolicy.xml
  mime_type: text/xml
- url: /WowBossCards.xap
  static_files: WowBossCards.xap
  upload: WowBossCards.xap
  mime_type: application/x-silverlight-app
- url: .*
  script: wowbosscards.py

wowbosscards.py

#!/usr/bin/env python

import cgi
import datetime
import wsgiref.handlers
import os
import logging
import string
import urllib

from google.appengine.ext import db
from google.appengine.api import users
from google.appengine.ext import webapp
from google.appengine.ext.webapp import template

class Xml(db.Model):
  xmlContent = db.TextProperty()
  date = db.DateTimeProperty(auto_now_add=True)


class XmlCrud(webapp.RequestHandler):
  def get(self, xmlType):

    xmlKey = string.capitalize(xmlType)
    xml = Xml.get_by_key_name(xmlKey)
    self.response.headers['Content-Type'] = "application/xml"

    self.response.out.write(xml.xmlContent)

  def post(self, xmlType):

    logging.debug("XmlCrud POST")
    xmlKey = string.capitalize(xmlType)
    xml = Xml.get_by_key_name(xmlKey)
    if len(self.request.get('content')) > 0 :
        xml.xmlContent = self.request.get('content')
    else:
        xml.xmlContent = self.request.body
    xml.put()

    self.redirect('/upload/' + xmlType)


def main():
  Xml.get_or_insert("Bosses", xmlContent="<a>Bosses go here</a>")
  Xml.get_or_insert("Dungeons", xmlContent="<a>Dungeons go here</a>")
  application = webapp.WSGIApplication([
                                          (r'/xml/(.*)', XmlCrud),
                                        ], debug=True)
  wsgiref.handlers.CGIHandler().run(application)


if __name__ == '__main__':
  main()

银光：

private class RequestExtended
{
    public VoidCall CallBack;
    public WebRequest Request;
    public Uri Host;

    public RequestExtended(WebRequest request, VoidCall callBack, Uri host)
    {
        Request = request;
        CallBack = callBack;
        Host = host;
    }
}

public static void ImportFromGoogle(Uri host, VoidCall callBack)
{
    try
    {
        if (host.Host == "localhost")
        {
            host = new Uri(host.Scheme + @"://" + host.Host + ":8080");
        }
        var bossesCrud = new Uri(host, "/xml/bosses");
        var bossesRequest = WebRequest.Create(bossesCrud);
        bossesRequest.BeginGetResponse(BossesResponse, new RequestExtended(bossesRequest, callBack, host));
    }
    catch (Exception ex)
    {

    }
}

public static void BossesResponse(IAsyncResult result)
{
    var requestExtended = result.AsyncState as RequestExtended;
    try
    {
        WebResponse response = requestExtended.Request.EndGetResponse(result);
        Stream responseStream = response.GetResponseStream();

        byte[] bytes = new byte[response.ContentLength];
        responseStream.Read(bytes, 0, bytes.Length);
        responseStream.Close();

        var enc = new System.Text.UTF8Encoding();
        string xml = enc.GetString(bytes, 0, bytes.Length);

        bosses = GetCollectionFromXmlString<BossCollection>(xml);

        if (requestExtended.CallBack != null) requestExtended.CallBack();
    }
    catch (WebException we)
    {
        HttpWebResponse response = (HttpWebResponse)we.Response;
        response.Close();
    }
    catch (Exception e)
    {
    }
}




public static void SaveBossesToGoogle(Uri host)
{
    if (host.Host == "localhost")
    {
        host = new Uri(host.Scheme + @"://" + host.Host + ":8080");
    }
    var bossesCrud = new Uri(host, "/xml/bosses");
    var request = WebRequest.Create(bossesCrud);
    request.Method = "POST";
    request.ContentType = "text/xml"; //"application/x-www-form-urlencoded";

    request.BeginGetRequestStream(GetSaveBossesRequestStreamCallback, new RequestExtended(request, null, host));
}

static void GetSaveBossesRequestStreamCallback(IAsyncResult result)
{
    var requestExtended = result.AsyncState as RequestExtended;
    try
    {
        Stream stream = requestExtended.Request.EndGetRequestStream(result);
        var xmlSerializer = new XmlSerializer(typeof(BossCollection));
        var xmlText = new StringBuilder();

        using (TextWriter textWriter = new StringWriter(xmlText))
        {
            xmlSerializer.Serialize(textWriter, Store.Bosses);
            textWriter.Close();
        }

        var enc = new System.Text.UTF8Encoding();
        var bytes = enc.GetBytes(xmlText.ToString());

        stream.Write(bytes, 0, bytes.Length);
        stream.Close();
        requestExtended.Request.BeginGetResponse(SaveResponse, requestExtended);
    }
    catch (WebException we)
    {
        HttpWebResponse response = (HttpWebResponse)we.Response;
        response.Close();
    }
}


static void SaveResponse(IAsyncResult result)
{
    var requestExtended = result.AsyncState as RequestExtended;
    try
    {
        WebResponse response = requestExtended.Request.EndGetResponse(result);
        if (requestExtended.CallBack != null) requestExtended.CallBack();
    }
    catch (WebException we)
    {
        HttpWebResponse response = (HttpWebResponse)we.Response;
        response.Close();
    }
}

【讨论】：

【解决方案2】：

我正在考虑做同样的事情，但我还没有遇到任何事情。

我正在考虑使用 JSON.net 进行通信，所以基本上在 GAE 中编写一个 REST 服务供客户端调用，并且可能使用 OAuth.NET 进行身份验证（除非我能找到 google 的 .NET 端口一，我还没看）

Silverlight 基本上只是 .NET，它的精简版，所以如果你能找到 .NET 代码来做某事，它应该可以工作，至少在某种程度上，在 SL 中:)

但这就是我所知道的 - 考虑一下。抱歉，还不能提供更多帮助！

【讨论】：

【解决方案3】：

我也在看这个。 GAE 有几个 REST 项目，我还没有尝试过，但希望在下周左右。

http://code.google.com/p/app3/

http://code.google.com/p/gae-json-rest/

http://code.google.com/p/appengine-rest-server/