Successor of the so useful deferred library on Google AppEngine (GAE).

It should fix some issues. It should work async.

Usage

By example:

from google.appengine.ext import ndb
import deferred2 as deferred


def work(message):
    pass


@ndb.tasklet
def defer_one_task():
    yield deferred.defer_async(work, 'to be done')


@ndb.tasklet
def defer_multiple_tasks():
    yield deferred.defer_multi_async(
        deferred.task(work, 'Hello'),
        deferred.task(work, 'world!'))


@ndb.tasklet
def defer_deferring():
    # this one enqueues one task right now, which will then add all the
    # other tasks
    yield deferred.one_shot_async(
        deferred.task(work, 'Hello'),
        deferred.task(work, 'world!'))

You see, it pretty much looks and works as before.

Changes

• transactional's new default is auto (instead of False), t.i. if your inside a transaction it will be set to True, otherwise it will be False
• You can set _urlsuffix which can be a str or a sequence of strs; which will get appended to the url. Pure cosmetics.
• In case you set a name that is too long or contains invalid characters, a hash of the name will be used instead.