[Lightning-dev] Receiving via unpublished channels
Hiroshi UENO
ueno at nayuta.co
Wed May 9 04:49:40 UTC 2018
Hi, ZmnSCPxj.
> An idea we want to consider is to simply send `channel_update` as soon as we lock in the channel:
> https://github.com/ElementsProject/lightning/pull/1330#issuecomment-383931817
Our node(ptarmigan) discard `channel_update` without `channel_announcement`.
We want to implement it.
I have some questions.
* Does `channel_update` send only for `announce_channel == 0`(in` open_channel.channel_flags`) ?
* Does `channel_update` send every time after `funding_locked` sending(established and reconnection) ?
Regards,
nayuta-ueno
On 2018/04/27 8:35, ZmnSCPxj via Lightning-dev wrote:
> Good morning list,
>
> While implementing support for `r` field in invoices, I stumbled upon some issues regarding *creating* invoices with `r` fields.
>
> In order to receive via an unpublished channel, we need to know what onLightning fees the other side of that channel wants to charge. We cannot use
> our own onLightning fees because our fees apply if we were forwarding to the other side.
>
> However, in case of an unpublished channel, we do not send channel_announcement, and in that case we do not send channel_update. So the other side of
> the channel never informs us of the onLightning fees they want to charge if we would receive funds by this channel.
>
> An idea we want to consider is to simply send `channel_update` as soon as we lock in the channel:
> https://github.com/ElementsProject/lightning/pull/1330#issuecomment-383931817
>
> I want to ask the other LN implementations (lnd, eclair, ucoin, lit) if we should consider standardizing this behavior (i.e. send `channel_update`
> after lockin regardless of published/unpublished state). It seems back-compatible: software which does not expect this behavior will simply drop the
> `channel_update` (as they do not follow a `channel_announcement`).
>
> In any case, what was the intended way to get the onLightning fee rates to put into invoice `r` fields for private routes?
>
> Regards,
> ZmnSCPxj
>
>
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--
//株式会社Nayuta
// 上野 寛(Hiroshi Ueno)
// email: ueno at nayuta.co
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