问google app engine的ferris2.2框架(python)，将图片上传到云存储？

EN

from ferris import Controller, route
from ferris.components.upload import Upload
import cloudstorage as gcs
from google.appengine.ext import blobstore
import logging


class ImageManager(Controller):
    class Meta:
        components = (Upload,)  

    @route
    def list(self):
        #This just passes the upload URL to use in the form
        self.context['upload_url'] = self.components.upload.generate_upload_url(uri=self.uri('image_manager:image_uploader_action'))


    @route
    def image_uploader_action(self):
        # This gets all of the uploads passed in from the form
        uploads = self.components.upload.get_uploads()

        # This is the raw google cloud object reference. 'myfile' is the name of the upload field in the html form
        file_gcs_obj_name = uploads['myfile'][0].cloud_storage.gs_object_name 

        # This is the blobstore key just for giggles
        file_blobstore_key = uploads['myfile'][0].key()

        # This will get rid of the preceeding junk you don't need i.e. "/gs/yadda/yadda"
        clean_file_name = file_gcs_obj_name[3:]

        # This is the name of the file as it was uploaded by the end-user
        file_name_friendly  = uploads['myfile'][0].filename

        # This is the actual file, with this you can do whatever you want
        the_actual_image = gcs.open(clean_file_name,'r')

        # The file name by default is long and ugly, lets make a copy of the file with a more friendly name
        new_filename = '/mydomain.appspot.com/'+file_name_friendly
        gcs.copy2(clean_file_name,new_filename)

        # We can generate a serving URL by using the blobstore API
        valid_blob_reference = blobstore.create_gs_key('/gs'+new_filename)
        file_serving_url = images.get_serving_url(valid_blob_reference)
        logging.info('the serving url is: %s'% file_serving_url)

        # delete the original image from cloud storage
        gcs.delete(clean_file_name)

        # Delete the original image from blobstore
        blobstore.delete(file_blobstore_key)

        # Close the file
        the_actual_image.close()

        return 'Done. go check the cloud storage browser'

{% extends "layouts/default.html" %}
{% block layout_content %}
<form name="myform" action="{{upload_url}}" method="POST" enctype="multipart/form-data">
    <input type="file" name="myfile" id="fileToUpload">
    <input type="submit" value="Upload File" name="submit">
</form>
{% endblock %}