'similar to add_torrent_task_by_info_hash, but faster. I may delete current add_torrent_task_by_info_hash completely in future'

def add_torrent_task_by_info_hash2(self, sha1, old_task_id=None):

    link = ('http://dynamic.cloud.vip.xunlei.com/interface/get_torrent?userid=%s&infoid=%s' % (self.id, sha1))
    return self.add_torrent_task_by_link(link, old_task_id=old_task_id)
