from twisted.internet import defer

# utility wrapper for DeferredList
def _check_deferred_list(results):
    # if any of the component Deferreds failed, return the first failure such
    # that an addErrback() would fire. If all were ok, return a list of the
    # results (without the success/failure booleans)
    for success,f in results:
        if not success:
            return f
    return [r[1] for r in results]
def DeferredListShouldSucceed(dl):
    d = defer.DeferredList(dl)
    d.addCallback(_check_deferred_list)
    return d