/// # use lightning::blinded_path::BlindedPath;
/// # use lightning::sign::KeysManager;
/// # use lightning::ln::peer_handler::IgnoringMessageHandler;
-/// # use lightning::onion_message::{CustomOnionMessageContents, Destination, OnionMessageContents, OnionMessagePath, OnionMessenger};
+/// # use lightning::onion_message::{CustomOnionMessageContents, Destination, MessageRouter, OnionMessageContents, OnionMessagePath, OnionMessenger};
/// # use lightning::util::logger::{Logger, Record};
/// # use lightning::util::ser::{Writeable, Writer};
/// # use lightning::io;
/// # impl Logger for FakeLogger {
/// # fn log(&self, record: &Record) { unimplemented!() }
/// # }
+/// # struct FakeMessageRouter {}
+/// # impl MessageRouter for FakeMessageRouter {
+/// # fn find_path(&self, sender: PublicKey, peers: Vec<PublicKey>, destination: Destination) -> Result<OnionMessagePath, ()> {
+/// # unimplemented!()
+/// # }
+/// # }
/// # let seed = [42u8; 32];
/// # let time = Duration::from_secs(123456);
/// # let keys_manager = KeysManager::new(&seed, time.as_secs(), time.subsec_nanos());
/// # let hop_node_id1 = PublicKey::from_secret_key(&secp_ctx, &node_secret);
/// # let (hop_node_id2, hop_node_id3, hop_node_id4) = (hop_node_id1, hop_node_id1, hop_node_id1);
/// # let destination_node_id = hop_node_id1;
+/// # let message_router = Arc::new(FakeMessageRouter {});
/// # let custom_message_handler = IgnoringMessageHandler {};
/// # let offers_message_handler = IgnoringMessageHandler {};
/// // Create the onion messenger. This must use the same `keys_manager` as is passed to your
/// // ChannelManager.
-/// let onion_messenger = OnionMessenger::new(&keys_manager, &keys_manager, logger, &offers_message_handler, &custom_message_handler);
+/// let onion_messenger = OnionMessenger::new(
+/// &keys_manager, &keys_manager, logger, message_router, &offers_message_handler,
+/// &custom_message_handler
+/// );
///
/// # struct YourCustomMessage {}
/// impl Writeable for YourCustomMessage {
///
/// [offers]: <https://github.com/lightning/bolts/pull/798>
/// [`OnionMessenger`]: crate::onion_message::OnionMessenger
-pub struct OnionMessenger<ES: Deref, NS: Deref, L: Deref, OMH: Deref, CMH: Deref>
+pub struct OnionMessenger<ES: Deref, NS: Deref, L: Deref, MR: Deref, OMH: Deref, CMH: Deref>
where
ES::Target: EntropySource,
NS::Target: NodeSigner,
L::Target: Logger,
+ MR::Target: MessageRouter,
OMH::Target: OffersMessageHandler,
CMH:: Target: CustomOnionMessageHandler,
{
logger: L,
pending_messages: Mutex<HashMap<PublicKey, VecDeque<msgs::OnionMessage>>>,
secp_ctx: Secp256k1<secp256k1::All>,
+ message_router: MR,
offers_handler: OMH,
custom_handler: CMH,
}
+/// A trait defining behavior for routing an [`OnionMessage`].
+///
+/// [`OnionMessage`]: msgs::OnionMessage
+pub trait MessageRouter {
+ /// Returns a route for sending an [`OnionMessage`] to the given [`Destination`].
+ ///
+ /// [`OnionMessage`]: msgs::OnionMessage
+ fn find_path(
+ &self, sender: PublicKey, peers: Vec<PublicKey>, destination: Destination
+ ) -> Result<OnionMessagePath, ()>;
+}
+
/// A path for sending an [`msgs::OnionMessage`].
#[derive(Clone)]
pub struct OnionMessagePath {
/// The message known to the handler. To support multiple message types, you may want to make this
/// an enum with a variant for each supported message.
type CustomMessage: CustomOnionMessageContents;
- /// Called with the custom message that was received.
- fn handle_custom_message(&self, msg: Self::CustomMessage);
+
+ /// Called with the custom message that was received, returning a response to send, if any.
+ fn handle_custom_message(&self, msg: Self::CustomMessage) -> Option<Self::CustomMessage>;
+
/// Read a custom message of type `message_type` from `buffer`, returning `Ok(None)` if the
/// message type is unknown.
fn read_custom_message<R: io::Read>(&self, message_type: u64, buffer: &mut R) -> Result<Option<Self::CustomMessage>, msgs::DecodeError>;
}
-impl<ES: Deref, NS: Deref, L: Deref, OMH: Deref, CMH: Deref> OnionMessenger<ES, NS, L, OMH, CMH>
+impl<ES: Deref, NS: Deref, L: Deref, MR: Deref, OMH: Deref, CMH: Deref>
+OnionMessenger<ES, NS, L, MR, OMH, CMH>
where
ES::Target: EntropySource,
NS::Target: NodeSigner,
L::Target: Logger,
+ MR::Target: MessageRouter,
OMH::Target: OffersMessageHandler,
CMH::Target: CustomOnionMessageHandler,
{
/// Constructs a new `OnionMessenger` to send, forward, and delegate received onion messages to
/// their respective handlers.
pub fn new(
- entropy_source: ES, node_signer: NS, logger: L, offers_handler: OMH, custom_handler: CMH
+ entropy_source: ES, node_signer: NS, logger: L, message_router: MR, offers_handler: OMH,
+ custom_handler: CMH
) -> Self {
let mut secp_ctx = Secp256k1::new();
secp_ctx.seeded_randomize(&entropy_source.get_secure_random_bytes());
pending_messages: Mutex::new(HashMap::new()),
secp_ctx,
logger,
+ message_router,
offers_handler,
custom_handler,
}
}
}
+ fn respond_with_onion_message<T: CustomOnionMessageContents>(
+ &self, response: OnionMessageContents<T>, path_id: Option<[u8; 32]>,
+ reply_path: Option<BlindedPath>
+ ) {
+ let sender = match self.node_signer.get_node_id(Recipient::Node) {
+ Ok(node_id) => node_id,
+ Err(_) => {
+ log_warn!(
+ self.logger, "Unable to retrieve node id when responding to onion message with \
+ path_id {:02x?}", path_id
+ );
+ return;
+ }
+ };
+
+ let peers = self.pending_messages.lock().unwrap().keys().copied().collect();
+
+ let destination = match reply_path {
+ Some(reply_path) => Destination::BlindedPath(reply_path),
+ None => {
+ log_trace!(
+ self.logger, "Missing reply path when responding to onion message with path_id \
+ {:02x?}", path_id
+ );
+ return;
+ },
+ };
+
+ let path = match self.message_router.find_path(sender, peers, destination) {
+ Ok(path) => path,
+ Err(()) => {
+ log_trace!(
+ self.logger, "Failed to find path when responding to onion message with \
+ path_id {:02x?}", path_id
+ );
+ return;
+ },
+ };
+
+ log_trace!(self.logger, "Responding to onion message with path_id {:02x?}", path_id);
+
+ if let Err(e) = self.send_onion_message(path, response, None) {
+ log_trace!(
+ self.logger, "Failed responding to onion message with path_id {:02x?}: {:?}",
+ path_id, e
+ );
+ return;
+ }
+ }
+
#[cfg(test)]
pub(super) fn release_pending_msgs(&self) -> HashMap<PublicKey, VecDeque<msgs::OnionMessage>> {
let mut pending_msgs = self.pending_messages.lock().unwrap();
false
}
-impl<ES: Deref, NS: Deref, L: Deref, OMH: Deref, CMH: Deref> OnionMessageHandler
-for OnionMessenger<ES, NS, L, OMH, CMH>
+impl<ES: Deref, NS: Deref, L: Deref, MR: Deref, OMH: Deref, CMH: Deref> OnionMessageHandler
+for OnionMessenger<ES, NS, L, MR, OMH, CMH>
where
ES::Target: EntropySource,
NS::Target: NodeSigner,
L::Target: Logger,
+ MR::Target: MessageRouter,
OMH::Target: OffersMessageHandler,
- CMH::Target: CustomOnionMessageHandler + Sized,
+ CMH::Target: CustomOnionMessageHandler,
{
/// Handle an incoming onion message. Currently, if a message was destined for us we will log, but
/// soon we'll delegate the onion message to a handler that can generate invoices or send
log_info!(self.logger,
"Received an onion message with path_id {:02x?} and {} reply_path",
path_id, if reply_path.is_some() { "a" } else { "no" });
- match message {
- OnionMessageContents::Offers(msg) => self.offers_handler.handle_message(msg),
- OnionMessageContents::Custom(msg) => self.custom_handler.handle_custom_message(msg),
+
+ let response = match message {
+ OnionMessageContents::Offers(msg) => {
+ self.offers_handler.handle_message(msg)
+ .map(|msg| OnionMessageContents::Offers(msg))
+ },
+ OnionMessageContents::Custom(msg) => {
+ self.custom_handler.handle_custom_message(msg)
+ .map(|msg| OnionMessageContents::Custom(msg))
+ },
+ };
+
+ if let Some(response) = response {
+ self.respond_with_onion_message(response, path_id, reply_path);
}
},
Ok((Payload::Forward(ForwardControlTlvs::Unblinded(ForwardTlvs {
}
}
-impl<ES: Deref, NS: Deref, L: Deref, OMH: Deref, CMH: Deref> OnionMessageProvider
-for OnionMessenger<ES, NS, L, OMH, CMH>
+impl<ES: Deref, NS: Deref, L: Deref, MR: Deref, OMH: Deref, CMH: Deref> OnionMessageProvider
+for OnionMessenger<ES, NS, L, MR, OMH, CMH>
where
ES::Target: EntropySource,
NS::Target: NodeSigner,
L::Target: Logger,
+ MR::Target: MessageRouter,
OMH::Target: OffersMessageHandler,
CMH::Target: CustomOnionMessageHandler,
{
///
/// [`SimpleArcChannelManager`]: crate::ln::channelmanager::SimpleArcChannelManager
/// [`SimpleArcPeerManager`]: crate::ln::peer_handler::SimpleArcPeerManager
-pub type SimpleArcOnionMessenger<L> = OnionMessenger<
+pub type SimpleArcOnionMessenger<L, R> = OnionMessenger<
Arc<KeysManager>,
Arc<KeysManager>,
Arc<L>,
+ Arc<R>,
IgnoringMessageHandler,
IgnoringMessageHandler
>;
///
/// [`SimpleRefChannelManager`]: crate::ln::channelmanager::SimpleRefChannelManager
/// [`SimpleRefPeerManager`]: crate::ln::peer_handler::SimpleRefPeerManager
-pub type SimpleRefOnionMessenger<'a, 'b, L> = OnionMessenger<
+pub type SimpleRefOnionMessenger<'a, 'b, 'c, L, R> = OnionMessenger<
&'a KeysManager,
&'a KeysManager,
&'b L,
+ &'c R,
IgnoringMessageHandler,
IgnoringMessageHandler
>;
projects / rust-lightning / blobdiff