【发布时间】：2014-04-09 13:40:38
【问题描述】：
我在 OS X 10.7.3 上使用 Pyramid 1.3 和 AppEngine 1.6.4 SDK。我正在使用 Python 2.7 并在 app.yaml 中设置了线程安全。
@view_config(route_name='manager_swms', permission='manager', renderer='manager/swms.jinja2')
def manager_swms(request):
"""Generates blobstore url and passes users swms in swms table"""
# generate url for any form upload that may occur
upload_url = blobstore.create_upload_url('/upload_swm')
user = get_current_user(request)
swms = DBSession.query(SWMS).filter_by(owner_id=int(user.id)).all()
return {
"analytics_id": analytics_id,
"user": get_current_user(request),
"upload_url": upload_url,
"swms": [(x.filename, x.blob_key) for x in swms]
}
class BlobstoreUploadHandler(object):
"""Base class for creation blob upload handlers."""
def __init__(self, *args, **kwargs):
self.__uploads = None
def get_uploads(self, field_name=None):
"""Get uploads sent to this handler.
Args:
field_name: Only select uploads that were sent as a specific field.
Returns:
A list of BlobInfo records corresponding to each upload.
Empty list if there are no blob-info records for field_name.
"""
if self.__uploads is None:
self.__uploads = {}
for key, value in self.request.params.items():
if isinstance(value, cgi.FieldStorage):
if 'blob-key' in value.type_options:
self.__uploads.setdefault(key, []).append(
blobstore.parse_blob_info(value))
if field_name:
try:
return list(self.__uploads[field_name])
except KeyError:
return []
else:
results = []
for uploads in self.__uploads.itervalues():
results += uploads
return results
@view_config(route_name='upload_swm', permission='manager')
class UploadHandler(BlobstoreUploadHandler):
''' Handles redirects from Blobstore uploads. '''
def __init__(self, request):
self.request = request
super(UploadHandler, self).__init__()
def __call__(self):
user = get_current_user(self.request)
for blob_info in self.get_uploads('file'):
new_swm = SWMS(
owner_id = int(user.id),
blob_key = str(blob_info.key()),
filename = blob_info.filename,
size = blob_info.size,
)
DBSession.add(new_swm)
DBSession.flush()
# redirect to swms page
return HTTPFound(location='/manager/swms')
在上面的代码中，manager_swms() 生成一个页面，其中包含一个用于将文件上传到 Blobstore 的表单。表单工作正常，使用表单时，我可以看到 Blob 出现在 Blobstore 中。然后从 blobstore POST 重定向到 /upload_swm，我在其中成功获取 BlobInfo 详细信息并将它们放入 SQL 表中。这一切都很好，我要做的最后一件事是重定向到第一页，以便在需要时可以上传另一个文件，我可以显示上传的文件列表。
根据 Pyramid 文档，我正在使用 HTTPFound(location='/manager/swms') [原始页面 URL] 尝试重定向，但是我得到了：
ERROR 2012-03-29 22:56:38,170 wsgi.py:208]
Traceback (most recent call last):
File "/Users/tim/work/OHSPro/var/parts/google_appengine/google/appengine/runtime/wsgi.py", line 196, in Handle
result = handler(self._environ, self._StartResponse)
File "lib/dist/pyramid/router.py", line 195, in __call__
foo = response(request.environ, start_response)
File "lib/dist/pyramid/httpexceptions.py", line 291, in __call__
foo = Response.__call__(self, environ, start_response)
File "lib/dist/webob/response.py", line 922, in __call__
start_response(self.status, headerlist)
File "/Users/tim/work/OHSPro/var/parts/google_appengine/google/appengine/runtime/wsgi.py", line 150, in _StartResponse
_GetTypeName(header[1]))
InvalidResponseError: header values must be str, got 'unicode'
INFO 2012-03-29 22:56:38,174 dev_appserver_blobstore.py:408] Upload handler returned 500
INFO 2012-03-29 22:56:38,193 dev_appserver.py:2884] "POST /_ah/upload/ahJkZXZ-cHJvdG8tc2NvaHNwcm9yGwsSFV9fQmxvYlVwbG9hZFNlc3Npb25fXxgTDA HTTP/1.1" 500 -
AppEngine 显然反对 HTTP 标头中的 unicode，但我没有做任何不寻常的 AFAIK。如果我进入 pdb 并查看 HTTPFound 对象，标题是：
ResponseHeaders([('Content-Type', 'text/html; charset=UTF-8'), ('Content-Length', '0'), ('Location', '/manager/swms')])
为什么我会从这些中得到一个 unicode 问题？
【问题讨论】：
标签： python google-app-engine pyramid