Google App Engine与其本地应用服务器的性能不同 [英] Google App Engine performs different from its local appserver

问题描述

以下功能会从Google搜寻结果中提取网址。它在 dev_appserver （localhost）中运行良好，但是当我将它部署到Google App Engine时，它会显示一些错误信息。

Program：

  def googleSearch（关键字）：
 from re import findall 
 from urllib2 import build_opener $ b $ from urllib import quote，unquote 
 urlregex = r'< a [] href =/url\?q=(http://.+?)[& ]'
 searchURL ='https://www.google.com/search?q='+ quote（keyword，safe =''）＃https将排除缓存结果
 #Google 
 opener = build_opener（）
 opener.addheaders = [（'User-agent'，'Mozilla / 5.0'）] 
 pagesource = opener.open（searchURL）.read（）
 result = findall（urlregex，pagesource）
打印结果
 resultlist = [] 
为结果中的网址：
 resultlist.append（unquote（url））
 resultlist = sorted（ set（resultlist），key = resultlist.index）
返回结果列表
  

GAE错误：

 内部服务器错误
 
服务器有错误或无法执行所要求的操作。 
 
 Traceback（最近一次调用最后一次）：
文件/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.5.2/webapp2.py，第1535行，在__call__ 
中rv = self.handle_exception（request，response，e）
文件/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.5.2/ webapp2.py，第1529行，在__call__ 
 rv = self.router.dispatch（request，response）
文件/ base / data / home / runtimes / python27 / python27_lib / versions / third_party / webapp2 -2.5.2 / webapp2.py，第1278行，在default_dispatcher 
中返回route.handler_adapter（request，response）
文件/ base / data / home / runtimes / python27 / python27_lib / versions / third_party /webapp2-2.5.2/webapp2.py，第1102行，在__call__ 
 return handler.dispatch（）
文件/ base / data / home / runtimes / python27 / python27_lib / versions / third_party / webapp2-2.5.2 / webapp2.py，第572行，发送
返回self.handle_exception（e，self.app.debug）
文件/ base / data / home /运行时/ python27 / python27_lib / versions / third_party / webapp2-2.5.2 / webapp2.py，第570行，分派
返回方法（* args，** kwargs）
文件/ base / data /home/apps/s~crawlnsearch/1.370098233684025667/main.py，第56行，获取
 result = googleSearch（q）
文件/ base / data / home / apps / s〜crawlnsearch / 1.370098233684025667 / goosearch.py​​，第15行，googleSearch 
 pageource = opener.open（searchURL）.read（）
文件/ base / data / home / runtimes / python27 / python27_dist / lib / python2 .7 / urllib2.py，第410行，打开
 response = meth（req，response）
文件/base/data/home/runtimes/python27/python27_dist/lib/python2.7/ urllib2.py，第523行，在http_response 
'http'，请求，响应，代码，msg，hdrs）
文件/ base / data / home / runtimes / python27 / python27_dist / lib / python2 .7 / urllib2.py，第442行，错误
 result = self._call_chain（* args）
文件/base/data/home/runtimes/python27/python27_dist/lib/python2.7 /urllib2.py，第382行，in _call_chain 
 result = func（* args）
在http_error_302 $ b $中的文件/base/data/home/runtimes/python27/python27_dist/lib/python2.7/urllib2.py，第629行b返回self.parent.open（new，timeout = req.timeout）
文件/base/data/home/runtimes/python27/python27_dist/lib/python2.7/urllib2.py，第410行，in在http_response $ b中打开
 response = meth（req，response）
文件/base/data/home/runtimes/python27/python27_dist/lib/python2.7/urllib2.py，第523行$ b'http'，request，response，code，msg，hdrs）
文件/base/data/home/runtimes/python27/python27_dist/lib/python2.7/urllib2.py，第448行，in错误
在_call_chain $ b中返回self._call_chain（* args）
文件/base/data/home/runtimes/python27/python27_dist/lib/python2.7/urllib2.py，第382行$ b result = func（* args）
在http_error_default 
中的文件/base/data/home/runtimes/python27/python27_dist/lib/python2.7/urllib2.py，第531行raise HTTPError （req.get_full_url（），代码，味精，hdrs，fp）
 HTTPError：HTTP错误503：服务不可用
  

是否有人知道这个问题的解决方案。

解决方案

这可能是因为Google的数据存储索引尚未更新。等一会儿，它应该工作。 Google将其解释为此处

注意：在应用程序可用之前，数据存储索引可能需要一些时间才能生成。如果索引仍处于生成过程中，您将在访问应用程序时收到NeedIndexError。这对于这个例子来说是一个暂时的错误，所以稍后再尝试一下，如果一开始你会收到这个异常。

The following function will extract URLs form Google search result. It works well in dev_appserver(localhost) but when I deployed it on Google App Engine it show some Error.

Program:

def googleSearch(keyword):
    from re import findall
    from urllib2 import build_opener
    from urllib import quote, unquote
    urlregex = r'<a[ ]href="/url\?q=(http://.+?)[&]'
    searchURL = 'https://www.google.com/search?q=' + quote(keyword, safe = '') # https will exclude Cached results
    #Google
    opener = build_opener()
    opener.addheaders = [('User-agent', 'Mozilla/5.0')]
    pagesource = opener.open(searchURL).read()
    result = findall(urlregex, pagesource)
    print result
    resultlist = []
    for url in result:
        resultlist.append(unquote(url))
    resultlist = sorted(set(resultlist), key=resultlist.index)
    return resultlist

GAE Error:

Internal Server Error

The server has either erred or is incapable of performing the requested operation.

Traceback (most recent call last):
  File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.5.2/webapp2.py", line 1535, in __call__
    rv = self.handle_exception(request, response, e)
  File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.5.2/webapp2.py", line 1529, in __call__
    rv = self.router.dispatch(request, response)
  File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.5.2/webapp2.py", line 1278, in default_dispatcher
    return route.handler_adapter(request, response)
  File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.5.2/webapp2.py", line 1102, in __call__
    return handler.dispatch()
  File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.5.2/webapp2.py", line 572, in dispatch
    return self.handle_exception(e, self.app.debug)
  File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.5.2/webapp2.py", line 570, in dispatch
    return method(*args, **kwargs)
  File "/base/data/home/apps/s~crawlnsearch/1.370098233684025667/main.py", line 56, in get
    result = googleSearch(q)
  File "/base/data/home/apps/s~crawlnsearch/1.370098233684025667/goosearch.py", line 15, in googleSearch
    pagesource = opener.open(searchURL).read()
  File "/base/data/home/runtimes/python27/python27_dist/lib/python2.7/urllib2.py", line 410, in open
    response = meth(req, response)
  File "/base/data/home/runtimes/python27/python27_dist/lib/python2.7/urllib2.py", line 523, in http_response
    'http', request, response, code, msg, hdrs)
  File "/base/data/home/runtimes/python27/python27_dist/lib/python2.7/urllib2.py", line 442, in error
    result = self._call_chain(*args)
  File "/base/data/home/runtimes/python27/python27_dist/lib/python2.7/urllib2.py", line 382, in _call_chain
    result = func(*args)
  File "/base/data/home/runtimes/python27/python27_dist/lib/python2.7/urllib2.py", line 629, in http_error_302
    return self.parent.open(new, timeout=req.timeout)
  File "/base/data/home/runtimes/python27/python27_dist/lib/python2.7/urllib2.py", line 410, in open
    response = meth(req, response)
  File "/base/data/home/runtimes/python27/python27_dist/lib/python2.7/urllib2.py", line 523, in http_response
    'http', request, response, code, msg, hdrs)
  File "/base/data/home/runtimes/python27/python27_dist/lib/python2.7/urllib2.py", line 448, in error
    return self._call_chain(*args)
  File "/base/data/home/runtimes/python27/python27_dist/lib/python2.7/urllib2.py", line 382, in _call_chain
    result = func(*args)
  File "/base/data/home/runtimes/python27/python27_dist/lib/python2.7/urllib2.py", line 531, in http_error_default
    raise HTTPError(req.get_full_url(), code, msg, hdrs, fp)
HTTPError: HTTP Error 503: Service Unavailable

Did any one know solution for this problem.

解决方案

It's probably because Google's datastore indexes aren't updated yet. Wait a little while and it should work. Google explains it here

Note: The Datastore Indexes may take some time to generate before your application is available. You will receive a NeedIndexError when accessing your app if the indexes are still in the process of being generated. This is a transient error for the example, so try a little later if at first you receive this exception.

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