我正在尝试使用taskqueue和deferred将一个大型用户信息列表从json文件导入到数据存储。User包含用户信息，包括来自不同应用程序的图像url。在导入过程中，应该抓取图像并将其上载到blob（在测试时效果很好）。
我被困在获取上传图像的blob_键上。
我认为它只发生在taskqueue/deferred中，因为我在一个“普通”的GET请求处理程序中尝试过它，它工作得很好。
这是我的经纪人：
class MigrationTask(BaseHandler):
def post(self):
if not self.request.get('file'):
return
json_data = open(self.request.get('file'))
data = json.load(json_data)
json_data.close()
for datum in data['results']:
deferred.defer(push_user_to_db, datum)
这是我的职责：
@ndb.transactional(xg=True)
def _push_user_to_db(profilePicture=None, ...):
if profilePicture:
if 'url' in profilePicture:
con = urlfetch.fetch(image_url)
if con.status_code == 200:
file_name = files.blobstore.create(mime_type='application/octet-stream')
with files.open(file_name, 'a') as f:
f.write(con.content)
files.finalize(file_name)
blob_key = files.blobstore.get_blob_key(file_name) # this part is where it errs
image_url = images.get_serving_url(file_name)
# some codes here...
def push_user_to_db(kwargs):
_push_user_to_db(**kwargs)
部分回溯：
blob_key = files.blobstore.get_blob_key(file_name)
File "C:\Program Files (x86)\Google\google_appengine\google\appengine\api\files\blobstore.py", line 132, in get_blob_key
namespace='')])[0]
File "C:\Program Files (x86)\Google\google_appengine\google\appengine\api\datastore.py", line 654, in Get
return GetAsync(keys, **kwargs).get_result()
File "C:\Program Files (x86)\Google\google_appengine\google\appengine\api\datastore.py", line 629, in GetAsync
return _GetConnection().async_get(config, keys, local_extra_hook)
File "C:\Program Files (x86)\Google\google_appengine\google\appengine\datastore\datastore_rpc.py", line 1574, in async_get
pbs = [key_to_pb(key) for key in keys]
File "C:\Program Files (x86)\Google\google_appengine\google\appengine\ext\ndb\model.py", line 653, in key_to_pb
return key.reference()
AttributeError: 'Key' object has no attribute 'reference'
PS：我也试过taskqueue而不是deferred。
编辑（1）：
这是回溯：
ERROR 2015-03-03 06:32:44,720 webapp2.py:1552] 'Key' object has no attribute 'reference'
Traceback (most recent call last):
File "C:\Program Files (x86)\Google\google_appengine\lib\webapp2-2.5.2\webapp2.py", line 1535, in __call__
rv = self.handle_exception(request, response, e)
File "C:\Program Files (x86)\Google\google_appengine\lib\webapp2-2.5.2\webapp2.py", line 1529, in __call__
rv = self.router.dispatch(request, response)
File "C:\Program Files (x86)\Google\google_appengine\lib\webapp2-2.5.2\webapp2.py", line 1278, in default_dispatcher
return route.handler_adapter(request, response)
File "C:\Program Files (x86)\Google\google_appengine\lib\webapp2-2.5.2\webapp2.py", line 1102, in __call__
return handler.dispatch()
File "C:\Program Files (x86)\Google\google_appengine\lib\webapp2-2.5.2\webapp2.py", line 572, in dispatch
return self.handle_exception(e, self.app.debug)
File "C:\Program Files (x86)\Google\google_appengine\lib\webapp2-2.5.2\webapp2.py", line 570, in dispatch
return method(*args, **kwargs)
File "C:\Program Files (x86)\Google\google_appengine\google\appengine\ext\deferred\deferred.py", line 310, in post
self.run_from_request()
File "C:\Program Files (x86)\Google\google_appengine\google\appengine\ext\deferred\deferred.py", line 305, in run_from_request
run(self.request.body)
File "C:\Program Files (x86)\Google\google_appengine\google\appengine\ext\deferred\deferred.py", line 147, in run
return func(*args, **kwds)
File "C:\project directory\migration.py", line 141, in push_user_to_db
_push_user_to_db(**kwargs)
File "C:\Program Files (x86)\Google\google_appengine\google\appengine\ext\ndb\utils.py", line 179, in inner_wrapper
return wrapped_decorator(func, args, kwds, **options)
File "C:\Program Files (x86)\Google\google_appengine\google\appengine\ext\ndb\model.py", line 3759, in transactional
func, args, kwds, **options).get_result()
File "C:\Program Files (x86)\Google\google_appengine\google\appengine\ext\ndb\tasklets.py", line 325, in get_result
self.check_success()
File "C:\Program Files (x86)\Google\google_appengine\google\appengine\ext\ndb\tasklets.py", line 371, in _help_tasklet_along
value = gen.send(val)
File "C:\Program Files (x86)\Google\google_appengine\google\appengine\ext\ndb\context.py", line 999, in transaction
result = callback()
File "C:\Program Files (x86)\Google\google_appengine\google\appengine\ext\ndb\model.py", line 3767, in <lambda>
return transaction_async(lambda: func(*args, **kwds), **options)
File "C:\project directory\migration.py", line 56, in _push_user_to_db
blob_key = files.blobstore.get_blob_key(file_name)
File "C:\Program Files (x86)\Google\google_appengine\google\appengine\api\files\blobstore.py", line 132, in get_blob_key
namespace='')])[0]
File "C:\Program Files (x86)\Google\google_appengine\google\appengine\api\datastore.py", line 654, in Get
return GetAsync(keys, **kwargs).get_result()
File "C:\Program Files (x86)\Google\google_appengine\google\appengine\api\datastore.py", line 629, in GetAsync
return _GetConnection().async_get(config, keys, local_extra_hook)
File "C:\Program Files (x86)\Google\google_appengine\google\appengine\datastore\datastore_rpc.py", line 1574, in async_get
pbs = [key_to_pb(key) for key in keys]
File "C:\Program Files (x86)\Google\google_appengine\google\appengine\ext\ndb\model.py", line 653, in key_to_pb
return key.reference()
AttributeError: 'Key' object has no attribute 'reference'
最佳答案
抬头！不赞成使用files api将文件写入Blobstore。我以前有过这个问题。我的代码在开发服务器（localhost）中运行得很好，但在App Engine服务器上出错。解决方案是通过Blobstore API在Google Cloud Storage中写入文件。