sync_thumbnails.py 文件源码

def add_thumbnail(file_name):
    ''' add a thumbnail for the specific file'''
    src_uri = boto.storage_uri('{}/{}'.format(conf.photos_bucket_name,
                                              file_name),
                               'gs')
    dest_uri = boto.storage_uri('{}/{}'.format(conf.thumbnails_bucket_name,
                                              file_name),
                               'gs')

    try:
        new_key = dest_uri.new_key()
    except boto.exception.NoAuthHandlerFound as e:
        logging.error(e)
        return None

    # Create a file-like object for holding the photo contents.
    photo = StringIO.StringIO()
    src_uri.get_key().get_file(photo)

    thumbnail = StringIO.StringIO()
    im = Image.open(photo)
    im.thumbnail((260, 260))
    im.save(thumbnail, 'JPEG')
    thumbnail.seek(0)
    # save the thumbnail
    try:
        new_key.set_contents_from_file(thumbnail)
        new_key.make_public()
    except boto.exception.GSResponseError as e:
        logging.error(e)
        # Do we have the credentials file set up?
        boto_cred_file = os.path.expanduser('~') + '/.boto'
        if not os.path.exists(boto_cred_file):
            logging.error('Credentials file {} was not found.'.format(boto_cred_file))