如何从本地python应用访问google云存储？

Question

当我的应用程序部署到gae时，我可以访问gcs，但我希望在开发期间从我的本地计算机访问gcs。我该怎么做呢？

以下是我尝试在gcs上打开文件时得到的回溯：

Traceback (most recent call last):
  File "/Users/alvinsolidum/Downloads/google_appengine/google/appengine/runtime/wsgi.py", line 267, in Handle
    result = handler(dict(self._environ), self._StartResponse)
  File "/Users/alvinsolidum/Downloads/google_appengine/lib/webapp2-2.3/webapp2.py", line 1519, in __call__
    response = self._internal_error(e)
  File "/Users/alvinsolidum/Downloads/google_appengine/lib/webapp2-2.3/webapp2.py", line 1511, in __call__
    rv = self.handle_exception(request, response, e)
  File "/Users/alvinsolidum/Downloads/google_appengine/lib/webapp2-2.3/webapp2.py", line 1505, in __call__
    rv = self.router.dispatch(request, response)
  File "/Users/alvinsolidum/Downloads/google_appengine/lib/webapp2-2.3/webapp2.py", line 1253, in default_dispatcher
    return route.handler_adapter(request, response)
  File "/Users/alvinsolidum/Downloads/google_appengine/lib/webapp2-2.3/webapp2.py", line 1077, in __call__
    return handler.dispatch()
  File "/Users/alvinsolidum/Downloads/google_appengine/lib/webapp2-2.3/webapp2.py", line 547, in dispatch
    return self.handle_exception(e, self.app.debug)
  File "/Users/alvinsolidum/Downloads/google_appengine/lib/webapp2-2.3/webapp2.py", line 545, in dispatch
    return method(*args, **kwargs)
  File "/Users/alvinsolidum/Documents/fallsafety-dataflow/preprocess/main.py", line 74, in get
    self.to_csv()
  File "/Users/alvinsolidum/Documents/fallsafety-dataflow/preprocess/main.py", line 41, in to_csv
    compressed_flo    = gcs.open(read_filepath, 'r')
  File "/Users/alvinsolidum/Documents/fallsafety-dataflow/preprocess/lib/cloudstorage/cloudstorage_api.py", line 103, in open
    offset=offset)
  File "/Users/alvinsolidum/Documents/fallsafety-dataflow/preprocess/lib/cloudstorage/storage_api.py", line 249, in __init__
    errors.check_status(status, [200], path, resp_headers=headers, body=content)
  File "/Users/alvinsolidum/Documents/fallsafety-dataflow/preprocess/lib/cloudstorage/errors.py", line 132, in check_status
    raise NotFoundError(msg)
NotFoundError: Expect status [200] from Google Storage. But got status 404.
Path: '/fallsafety-test-general/apple-watch/continuous/active/54d0044919e92b0c00c29555-29391CEA593C4D798A1EA08BD23DA47E-0002-continuous.csv.gz'.
Request headers: None.
Response headers: {'date': 'Mon, 29 Aug 2016 23:15:49 GMT', 'server': 'Development/2.0', 'connection': 'close'}.
Body: ''.
Extra info: None.

Answer 1

啊，看起来你使用的是Python的appengine-gcs-client。当在本地开发服务器上运行时，客户机默认为使用本地的伪GCS版本(参见响应头" server : Development/2.0"?)。我猜你要找的是一个真正的GCS对象，你还没有上传到本地的假的。

你可以通过上传有问题的对象作为服务器初始化的一部分，使用不同的库(gcloud-python真的很好)，或者禁用本地fake，这可以通过设置SERVER_SOFTWARE环境变量来实现：

# Logic for whether to use local fake is here: https://github.com/GoogleCloudPlatform/appengine-gcs-client/blob/f9dbbd43ec431f739aa33a44cf24d32a19579f33/python/src/cloudstorage/common.py#L387
os.environ['SERVER_SOFTWARE'] = 'Development (remote_api)/1.0'