Appengine Blobstore: Index out of range

Question

I'm trying to upload a file using Blobstore API to Google Cloud Storage. The image uploads correctly, but then I try to process it (link it to a user). I'm getting the error:

Index out of range

This is my code:

class UploadHandler(blobstore_handlers.BlobstoreUploadHandler):
    def post(self):
        upload_files = self.get_file_infos('file')  # 'file' is file upload field in the form
        file_info = upload_files[0]

        #self.response.headers['Content-Type'] = 'application/x-www-form-urlencoded'
        #self.response.headers.add_header('Access-Control-Allow-Origin', '*')
        gcs_filename = file_info.gs_object_name
        file_key = blobstore.create_gs_key(gcs_filename)

        File(file=file_key, owner=utils.get_current_user(), 
                    url= images.get_serving_url(file_key)).put()

My code drops in file_info = upload_files[0] line.

Answer 1

Where is your code that puts the file into your Google Cloud Storage bucket?

I think the problem might be these two lines, depending on how you implemented the GCS upload...

gcs_filename = file_info.gs_object_name
file_key = blobstore.create_gs_key(gcs_filename)

The gs_object_name should only return a meaningful result if the item is from GCS. This would cause create_gs_key() to fail as well if the gcs_filename is not correct.

For how to use blobstore API with Google Cloud Storage, please see this article for details - https://cloud.google.com/appengine/docs/python/blobstore/#Python_Using_the_Blobstore_API_with_Google_Cloud_Storage