use crate::routing::gossip::{NodeId, ReadOnlyNetworkGraph};
use crate::sign::EntropySource;
use crate::util::ser::{Readable, Writeable, Writer};
+use crate::util::scid_utils;
use crate::io;
use crate::prelude::*;
},
}
}
+
+ /// Attempts to a use a compact representation for the [`IntroductionNode`] by using a directed
+ /// short channel id from a channel in `network_graph` leading to the introduction node.
+ ///
+ /// While this may result in a smaller encoding, there is a trade off in that the path may
+ /// become invalid if the channel is closed or hasn't been propagated via gossip. Therefore,
+ /// calling this may not be suitable for long-lived blinded paths.
+ pub fn use_compact_introduction_node(&mut self, network_graph: &ReadOnlyNetworkGraph) {
+ if let IntroductionNode::NodeId(pubkey) = &self.introduction_node {
+ let node_id = NodeId::from_pubkey(pubkey);
+ if let Some(node_info) = network_graph.node(&node_id) {
+ if let Some((scid, channel_info)) = node_info
+ .channels
+ .iter()
+ .filter_map(|scid| network_graph.channel(*scid).map(|info| (*scid, info)))
+ .min_by_key(|(scid, _)| scid_utils::block_from_scid(*scid))
+ {
+ let direction = if node_id == channel_info.node_one {
+ Direction::NodeOne
+ } else {
+ debug_assert_eq!(node_id, channel_info.node_two);
+ Direction::NodeTwo
+ };
+ self.introduction_node =
+ IntroductionNode::DirectedShortChannelId(direction, scid);
+ }
+ }
+ }
+ }
}
impl Writeable for BlindedPath {