Trampoline onion construction.

[rust-lightning] / lightning / src / ln / msgs.rs

diff --git a/lightning/src/ln/msgs.rs b/lightning/src/ln/msgs.rs
index e454be89b33edb4cb7c1d2c1af0325c2862afb74..19c92e5746e51696f658d220cb2ab4fa4964cbfd 100644 (file)
--- a/lightning/src/ln/msgs.rs
+++ b/lightning/src/ln/msgs.rs
@@ -1740,6 +1740,17 @@ mod fuzzy_internal_msgs {
                }
        }
 
+       pub(crate) enum OutboundTrampolinePayload {
+               #[allow(unused)]
+               Forward {
+                       /// The value, in msat, of the payment after this hop's fee is deducted.
+                       amt_to_forward: u64,
+                       outgoing_cltv_value: u32,
+                       /// The node id to which the trampoline node must find a route
+                       outgoing_node_id: PublicKey,
+               }
+       }
+
        pub struct DecodedOnionErrorPacket {
                pub(crate) hmac: [u8; 32],
                pub(crate) failuremsg: Vec<u8>,
@@ -2597,6 +2608,22 @@ impl Writeable for OutboundOnionPayload {
        }
 }
 
+impl Writeable for OutboundTrampolinePayload {
+       fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
+               match self {
+                       Self::Forward { amt_to_forward, outgoing_cltv_value, outgoing_node_id } => {
+                               _encode_varint_length_prefixed_tlv!(w, {
+                                       (2, HighZeroBytesDroppedBigSize(*amt_to_forward), required),
+                                       (4, HighZeroBytesDroppedBigSize(*outgoing_cltv_value), required),
+                                       (14, outgoing_node_id, required)
+                               });
+                       }
+               }
+               Ok(())
+       }
+}
+
+
 impl<NS: Deref> ReadableArgs<(Option<PublicKey>, &NS)> for InboundOnionPayload where NS::Target: NodeSigner {
        fn read<R: Read>(r: &mut R, args: (Option<PublicKey>, &NS)) -> Result<Self, DecodeError> {
                let (update_add_blinding_point, node_signer) = args;