将Blobstore迁移到GCS：Google App Engine Python

这是我现有的用于将数据上传到blobstore的py代码.

from google.appengine.api import files

def save_data_to_blob_store(data):
    # Create the file
    file_name = files.blobstore.create(mime_type='application/octet-stream')

    # Open the file and write to it
    with files.open(file_name,'a') as f:
        f.write(data)

    # Finalize the file. Do this before attempting to read it.
    files.finalize(file_name)

    # Get the file's blob key
    blob_key = files.blobstore.get_blob_key(file_name)
    return str(blob_key)

现在我正在尝试弃用blobstore&转移到GCS.我写了一些代码但没有按预期工作.

def save_data_to_gcs(request):
    file_name = '/gs/bucket-name-1/new_file' # change bucket/object names to suit your needs
    writable_file_name = files.gs.create(file_name,mime_type='application/octet-stream',acl='public-read')
    with files.open(writable_file_name,'a') as f:
        f.write('Hello World!n')
        f.write('This is a Google Cloud Storage object!n')
    files.finalize(writable_file_name)

在执行此过程时,GAE在生产中抛出错误,

Exception in request:
Traceback (most recent call last):
  File "/base/data/home/apps/s~bfsolu/248.371810019093562707/common/zip-packages/django-1.1.zip/django/core/handlers/base.py",line 92,in get_response
    response = callback(request,*callback_args,**callback_kwargs)
  File "/base/data/home/apps/s~bfsolu/248.371810019093562707/myapp/utils.py",line 51,in save_data_to_gcs
    acl='public-read')
  File "/base/data/home/runtimes/python27/python27_lib/versions/1/google/appengine/api/files/gs.py",line 326,in create
    return files._create(_GS_FILESYSTEM,filename=filename,params=params)
  File "/base/data/home/runtimes/python27/python27_lib/versions/1/google/appengine/api/files/file.py",line 647,in _create
    _make_call('Create',request,response)
  File "/base/data/home/runtimes/python27/python27_lib/versions/1/google/appengine/api/files/file.py",line 252,in _make_call
    _raise_app_error(e)
  File "/base/data/home/runtimes/python27/python27_lib/versions/1/google/appengine/api/files/file.py",line 210,in _raise_app_error
    raise PermissionDeniedError(e)
 PermissionDeniedError: ApplicationError: 8

任何人都可以帮助在save_data_to_gcs程序中纠正我,不胜感激.

谢谢.