Check that the ttl for an item has not expired, and that the item has
       not exceeded it's maximum allotted tries

def check_ttl_max_tries(tries, enqueued_at, max_tries, ttl):
    '''Check that the ttl for an item has not expired, and that the item has
       not exceeded it's maximum allotted tries'''
    if max_tries > 0 and tries >= max_tries:
        raise FSQMaxTriesError(errno.EINTR, u'Max tries exceded:'\
                               u' {0} ({1})'.format(max_tries, tries))
    if ttl > 0 and datetime.datetime.now() < enqueued_at + datetime.timedelta(
            seconds=ttl):
        raise FSQTTLExpiredError(errno.EINTR, u'TTL Expired:'\
                                 u' {0}'.format(ttl))