async def close_channel(self, chan_id):
    chan = self._channels[chan_id]
    peer = self._peers[chan.node_id]
    return (await peer.close_channel(chan_id))
async def close_channel(self, chan_id):
    chan = self._channels[chan_id]
    peer = self._peers[chan.node_id]
    return (await peer.close_channel(chan_id))