def upload(self, key_name, file_name, cb=True):
"""
Upload a file to the bucket
@param string key_name - Key of the file to upload
"""
log.debug("Uploading file %s to S3 under key %s" % (file_name, key_name))
key = Key(self.bucket, key_name)
key.encrypted = True
upload_kwargs = {}
if cb:
upload_kwargs = dict(cb=self._progress_callback, num_cb=10)
key.set_contents_from_filename(file_name, **upload_kwargs)
log.debug("Upload complete. Marking object private")
key.set_acl("private")
