From: Matt Corallo Date: Mon, 5 Jul 2021 18:10:34 +0000 (+0000) Subject: [router] Use the invoice value for last-hop hint channel capacity X-Git-Tag: v0.0.100~23^2 X-Git-Url: http://git.bitcoin.ninja/index.cgi?p=rust-lightning;a=commitdiff_plain;h=9169dfbe5bb2e43b1ec14ca4020c9e3e5c049062 [router] Use the invoice value for last-hop hint channel capacity If an invoice contains route hints, we should assume the channel capacity is sufficient to route the invoice's value. --- diff --git a/lightning/src/routing/router.rs b/lightning/src/routing/router.rs index ac9b2109..087e7ede 100644 --- a/lightning/src/routing/router.rs +++ b/lightning/src/routing/router.rs @@ -882,7 +882,11 @@ pub fn get_route(our_node_id: &PublicKey, network: &NetworkGraph, paye htlc_maximum_msat: hop.htlc_maximum_msat, fees: hop.fees, }; - if add_entry!(hop.short_channel_id, hop.src_node_id, payee, directional_info, None::, &empty_channel_features, 0, path_value_msat, 0) { + // We assume that the recipient only included route hints for routes which had + // sufficient value to route `final_value_msat`. Note that in the case of "0-value" + // invoices where the invoice does not specify value this may not be the case, but + // better to include the hints than not. + if add_entry!(hop.short_channel_id, hop.src_node_id, payee, directional_info, Some((final_value_msat + 999) / 1000), &empty_channel_features, 0, path_value_msat, 0) { // If this hop connects to a node with which we have a direct channel, // ignore the network graph and, if the last hop was added, add our // direct channel to the candidate set.