如何从网址将图片上传到Blobstore？

Question

Google App Engine的文件API现在支持通过编程方式创建blobstore的blob。

我正在尝试通过HTTP获取一张图片，并把它存储到blobstore中：

    file_name = files.blobstore.create(mime_type='image/jpeg')
    image = urllib2.urlopen(url)
    with files.open(file_name, 'a') as f:
        f.write(image)  # LINE 142

    files.finalize(file_name)   
    blob_key = files.blobstore.get_blob_key(file_name) 

这段代码出现了错误：

  File "/Users/willmerydith/repos/spam/admin.py", line 142, in post
    f.write(image)
  File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/api/files/file.py", line 364, in write
    self._make_rpc_call_with_retry('Append', request, response)
  File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/api/files/file.py", line 472, in _make_rpc_call_with_retry
    _make_call(method, request, response)
  File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/api/files/file.py", line 229, in _make_call
    rpc.check_success()
  File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/api/apiproxy_stub_map.py", line 558, in check_success
    self.__rpc.CheckSuccess()
  File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/api/apiproxy_rpc.py", line 156, in _WaitImpl
    self.request, self.response)
  File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/api/apiproxy_stub.py", line 80, in MakeSyncCall
    if request.ByteSize() > self.__max_request_size:
  File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/api/files/file_service_pb.py", line 1923, in ByteSize
    n += self.lengthString(len(self.data_))
AttributeError: addinfourl instance has no attribute '__len__'

我怀疑是因为我超过了大小限制。这个问题是因为我写入图片到blobstore的方式不对吗？Blobstore的大小限制是2GB，而我测试的图片大小都在200-300KB以下。

Answer 1

这个已经不管用了，因为文件的接口在2015年9月就被关闭了。

Answer 2

urllib2.urlopen 返回的是一个 urllib2.addinourl 对象，而不是一个字符串。你不能直接把这个对象写入你的文件。

试试在第142行用 f.write(image.read())。