Django文件上传-fileno错误

Question

我正在尝试将文件（音频文件）从 django webapp 上传到 django rest 服务。

形式：

<form method="post" action="/" name="submit" enctype="multipart/form-data">
        {% csrf_token %}
        <input type="file" name="uploaded_file"><br /><br />
        <input type="submit" name="submit" value="Submit">
</form>

观点：

from poster.streaminghttp import register_openers
from poster.encode import multipart_encode
import urllib2

<...>

def post(self, request):
    """
    POST request: handles file upload to web service
    """
    uploaded_file = request.FILES['uploaded_file']

    server = "http://127.0.0.1:8000"
    headers = {}

    # Register the streaming http handlers with urllib2
    register_openers()

    data = {
        'uploaded_file' : uploaded_file,
        'file_name' : uploaded_file.name,
        'additionalattr': 111,
    }

    datagen, headers = multipart_encode(data)
    headers['Authorization'] = 'Token <...>'

    headers['Connection']='keep-alive'
    urllib_request = urllib2.Request('%s/file_upload/' % ( server ), datagen, headers)

    json_response = json.loads(urllib2.urlopen(urllib_request).read())

    return <...>

当我上传文件时，我收到以下由 multipart_encode 引起的错误代码：

Traceback (most recent call last):
  File "/Users/phoebus/Library/Python/2.7/lib/python/site-packages/django/core/handlers/exception.py", line 39, in inner
    response = get_response(request)
  File "/Users/phoebus/Library/Python/2.7/lib/python/site-packages/django/core/handlers/base.py", line 186, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "/Users/phoebus/Library/Python/2.7/lib/python/site-packages/django/core/handlers/base.py", line 184, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/Users/phoebus/Library/Python/2.7/lib/python/site-packages/django/contrib/auth/decorators.py", line 23, in _wrapped_view
    return view_func(request, *args, **kwargs)
  File "/Users/phoebus/Library/Python/2.7/lib/python/site-packages/django/views/generic/base.py", line 68, in view
    return self.dispatch(request, *args, **kwargs)
  File "/Users/phoebus/Library/Python/2.7/lib/python/site-packages/django/views/generic/base.py", line 88, in dispatch
    return handler(request, *args, **kwargs)
  File "/Users/phoebus/Projects/speechanalyzerwebapp/speechanalyzerwebapp/welcome.py", line 41, in post
    datagen, headers = multipart_encode(data)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/poster/encode.py", line 411, in multipart_encode
    headers = get_headers(params, boundary)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/poster/encode.py", line 311, in get_headers
    headers['Content-Length'] = str(get_body_size(params, boundary))
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/poster/encode.py", line 302, in get_body_size
    size = sum(p.get_size(boundary) for p in MultipartParam.from_params(params))
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/poster/encode.py", line 177, in from_params
    filetype=filetype, fileobj=value))
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/poster/encode.py", line 108, in __init__
    self.filesize = os.fstat(fileobj.fileno()).st_size
UnsupportedOperation: fileno

谁能帮助我了解问题所在以及如何解决？

提前致谢！

Answer 1

似乎UploadedFile 不是问题，您使用的poster 库是旧更新检查最新版本here，更新了我的旧答案

Answer 2

看来我和你有同样的问题。折腾了好久，终于解决了这个问题。

这是我的代码：

import urllib2
from poster.encode import multipart_encode, MultipartParam
from poster.streaminghttp import register_openers

register_openers()

class MyView(APIView):
    def post(self, request, format=None):
        uploaded_file = request.FILES.get('img', None)
        if uploaded_file:
            new_data = {}
            new_data['img'] = MultipartParam(
                'img',
                filename=uploaded_file.name,
                filetype=uploaded_file.content_type,         
                filesize=uploaded_file._size, # required, if missed, will raise `UnsupportedOperation: fileno` error
                fileobj=uploaded_file.file
            )
            datagen, headers = multipart_encode(new_data)
            request = urllib2.Request(URL, datagen, headers)
            response = urllib2.open(request)
            if response.code==200:
                print(response.read())
                return 'OK'
            else:
                return 'error'

希望为时不晚，为您提供帮助。