# standard imports
import uuid
import logging

logg = logging.getLogger(__name__)


def do_yield(req, env, data_dir, settings):
    u = uuid.uuid4()
    data_dir.add(u, b'\x00')
    return str(u)


def check(s, data_dir):
    p = data_dir.to_filepath(s)
    f = open(p, 'rb')
    r = f.read(20)
    f.close()
    return len(r) == 1