logging every sent and receive onion message

Logs every sent + receive for P2P messages
solves #2346

fuzz/src/onion_message.rs

@@ -91,6 +91,7 @@ impl OffersMessageHandler for TestOffersMessageHandler {
 	}
 }
 
+#[derive(Debug)]
 struct TestCustomMessage {}
 
 const CUSTOM_MESSAGE_TYPE: u64 = 4242;
@@ -265,9 +266,10 @@ mod tests {
 		{
 			let log_entries = logger.lines.lock().unwrap();
 			assert_eq!(log_entries.get(&("lightning::onion_message::messenger".to_string(),
-						"Received an onion message with path_id None and a reply_path".to_string())), Some(&1));
+						"Received an onion message with path_id None and a reply_path: Custom(TestCustomMessage)"
+						.to_string())), Some(&1));
 			assert_eq!(log_entries.get(&("lightning::onion_message::messenger".to_string(),
-						"Sending onion message when responding to Custom onion message with path_id None".to_string())), Some(&1));
+						"Sending onion message: TestCustomMessage".to_string())), Some(&1));
 		}
 
 		let two_unblinded_hops_om = "\

lightning/src/offers/invoice.rs

@@ -720,8 +720,7 @@ impl Bolt12Invoice {
 		self.contents.verify(TlvStream::new(&self.bytes), key, secp_ctx)
 	}
 
-	#[cfg(test)]
-	pub(super) fn as_tlv_stream(&self) -> FullInvoiceTlvStreamRef {
+	pub(crate) fn as_tlv_stream(&self) -> FullInvoiceTlvStreamRef {
 		let (payer_tlv_stream, offer_tlv_stream, invoice_request_tlv_stream, invoice_tlv_stream) =
 			self.contents.as_tlv_stream();
 		let signature_tlv_stream = SignatureTlvStreamRef {
@@ -1143,7 +1142,6 @@ impl_writeable!(FallbackAddress, { version, program });
 type FullInvoiceTlvStream =
 	(PayerTlvStream, OfferTlvStream, InvoiceRequestTlvStream, InvoiceTlvStream, SignatureTlvStream);
 
-#[cfg(test)]
 type FullInvoiceTlvStreamRef<'a> = (
 	PayerTlvStreamRef<'a>,
 	OfferTlvStreamRef<'a>,

lightning/src/offers/invoice_request.rs

@@ -608,8 +608,7 @@ impl InvoiceRequest {
 		})
 	}
 
-	#[cfg(test)]
-	fn as_tlv_stream(&self) -> FullInvoiceRequestTlvStreamRef {
+	pub(crate) fn as_tlv_stream(&self) -> FullInvoiceRequestTlvStreamRef {
 		let (payer_tlv_stream, offer_tlv_stream, invoice_request_tlv_stream) =
 			self.contents.as_tlv_stream();
 		let signature_tlv_stream = SignatureTlvStreamRef {
@@ -811,7 +810,6 @@ tlv_stream!(InvoiceRequestTlvStream, InvoiceRequestTlvStreamRef, INVOICE_REQUEST
 type FullInvoiceRequestTlvStream =
 	(PayerTlvStream, OfferTlvStream, InvoiceRequestTlvStream, SignatureTlvStream);
 
-#[cfg(test)]
 type FullInvoiceRequestTlvStreamRef<'a> = (
 	PayerTlvStreamRef<'a>,
 	OfferTlvStreamRef<'a>,

lightning/src/onion_message/functional_tests.rs

@@ -381,6 +381,7 @@ fn reply_path() {
 fn invalid_custom_message_type() {
 	let nodes = create_nodes(2);
 
+	#[derive(Debug)]
 	struct InvalidCustomMessage{}
 	impl OnionMessageContents for InvalidCustomMessage {
 		fn tlv_type(&self) -> u64 {

lightning/src/onion_message/messenger.rs

@@ -71,7 +71,7 @@ use crate::prelude::*;
 /// # use std::sync::Arc;
 /// # struct FakeLogger;
 /// # impl Logger for FakeLogger {
-/// #     fn log(&self, record: Record) { unimplemented!() }
+/// #     fn log(&self, record: Record) { println!("{:?}" , record); }
 /// # }
 /// # struct FakeMessageRouter {}
 /// # impl MessageRouter for FakeMessageRouter {
@@ -97,7 +97,8 @@ use crate::prelude::*;
 ///     &keys_manager, &keys_manager, logger, message_router, &offers_message_handler,
 ///     &custom_message_handler
 /// );
-///
+
+/// # #[derive(Debug)]
 /// # struct YourCustomMessage {}
 /// impl Writeable for YourCustomMessage {
 /// 	fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
@@ -517,6 +518,9 @@ where
 	pub fn send_onion_message<T: OnionMessageContents>(
 		&self, path: OnionMessagePath, contents: T, reply_path: Option<BlindedPath>
 	) -> Result<(), SendError> {
+
+		log_trace!(self.logger, "Sending onion message: {:?}", contents);
+		
 		let (first_node_id, onion_msg) = create_onion_message(
 			&self.entropy_source, &self.node_signer, &self.secp_ctx, path, contents, reply_path
 		)?;
@@ -570,7 +574,7 @@ where
 			},
 		};
 
-		log_trace!(self.logger, "Sending onion message {}", log_suffix);
+		log_trace!(self.logger, "Sending onion message {}: {:?}", log_suffix, contents);
 
 		if let Err(e) = self.send_onion_message(path, contents, reply_path) {
 			log_trace!(self.logger, "Failed sending onion message {}: {:?}", log_suffix, e);
@@ -629,9 +633,10 @@ where
 			msg, &self.secp_ctx, &*self.node_signer, &*self.logger, &*self.custom_handler
 		) {
 			Ok(PeeledOnion::Receive(message, path_id, reply_path)) => {
-				log_trace!(self.logger,
-					"Received an onion message with path_id {:02x?} and {} reply_path",
-						path_id, if reply_path.is_some() { "a" } else { "no" });
+				log_trace!(
+					self.logger,
+				   "Received an onion message with path_id {:02x?} and {} reply_path: {:?}",
+					path_id, if reply_path.is_some() { "a" } else { "no" }, message);
 
 				match message {
 					ParsedOnionMessageContents::Offers(msg) => {

lightning/src/onion_message/offers.rs

@@ -10,6 +10,7 @@
 //! Message handling for BOLT 12 Offers.
 
 use core::convert::TryFrom;
+use core::fmt;
 use crate::io::{self, Read};
 use crate::ln::msgs::DecodeError;
 use crate::offers::invoice_error::InvoiceError;
@@ -58,7 +59,7 @@ pub trait OffersMessageHandler {
 /// Possible BOLT 12 Offers messages sent and received via an [`OnionMessage`].
 ///
 /// [`OnionMessage`]: crate::ln::msgs::OnionMessage
-#[derive(Clone, Debug)]
+#[derive(Clone)]
 pub enum OffersMessage {
 	/// A request for a [`Bolt12Invoice`] for a particular [`Offer`].
 	///
@@ -92,6 +93,22 @@ impl OffersMessage {
 	}
 }
 
+impl fmt::Debug for OffersMessage {
+	fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+		match self {
+			OffersMessage::InvoiceRequest(message) => {
+				write!(f, "{:?}", message.as_tlv_stream())
+			}
+			OffersMessage::Invoice(message) => {
+				write!(f, "{:?}", message.as_tlv_stream())
+			}
+			OffersMessage::InvoiceError(message) => {
+				write!(f, "{:?}", message)
+			}
+		}
+	}
+}
+
 impl OnionMessageContents for OffersMessage {
 	fn tlv_type(&self) -> u64 {
 		match self {

lightning/src/onion_message/packet.rs

@@ -147,7 +147,7 @@ impl<T: OnionMessageContents> Writeable for ParsedOnionMessageContents<T> {
 }
 
 /// The contents of an onion message.
-pub trait OnionMessageContents: Writeable {
+pub trait OnionMessageContents: Writeable + core::fmt::Debug {
 	/// Returns the TLV type identifying the message contents. MUST be >= 64.
 	fn tlv_type(&self) -> u64;
 }

lightning/src/util/ser_macros.rs

@@ -917,7 +917,7 @@ macro_rules! tlv_stream {
 
 		#[cfg_attr(test, derive(PartialEq))]
 		#[derive(Debug)]
-		pub(super) struct $nameref<'a> {
+		pub(crate) struct $nameref<'a> {
 			$(
 				pub(super) $field: Option<tlv_record_ref_type!($fieldty)>,
 			)*