From 3f500ef230699fdf566cb09231dd7c15c4a55c35 Mon Sep 17 00:00:00 2001
From: Arik Sosman <git@arik.io>
Date: Wed, 2 Aug 2023 18:34:01 -0700
Subject: [PATCH] Remove println from verifier.rs

---
 src/downloader.rs |  2 +-
 src/verifier.rs   | 28 +++++++++++++++++++---------
 2 files changed, 20 insertions(+), 10 deletions(-)

diff --git a/src/downloader.rs b/src/downloader.rs
index 34a5c66..8d5cdb0 100644
--- a/src/downloader.rs
+++ b/src/downloader.rs
@@ -42,7 +42,7 @@ pub(crate) struct GossipRouter<L: Deref + Clone + Send + Sync + 'static> where L
 impl<L: Deref + Clone + Send + Sync> GossipRouter<L> where L::Target: Logger {
 	pub(crate) fn new(network_graph: Arc<NetworkGraph<L>>, sender: mpsc::Sender<GossipMessage>, logger: L) -> Self {
 		let outbound_gossiper = Arc::new(P2PGossipSync::new(Arc::clone(&network_graph), None, logger.clone()));
-		let verifier = Arc::new(ChainVerifier::new(Arc::clone(&network_graph), Arc::clone(&outbound_gossiper)));
+		let verifier = Arc::new(ChainVerifier::new(Arc::clone(&network_graph), Arc::clone(&outbound_gossiper), logger.clone()));
 		Self {
 			native_router: P2PGossipSync::new(network_graph, Some(Arc::clone(&verifier)), logger.clone()),
 			outbound_gossiper,
diff --git a/src/verifier.rs b/src/verifier.rs
index 872a501..6813ff7 100644
--- a/src/verifier.rs
+++ b/src/verifier.rs
@@ -6,6 +6,7 @@ use std::sync::Mutex;
 use bitcoin::{BlockHash, TxOut};
 use bitcoin::blockdata::block::Block;
 use bitcoin::hashes::Hash;
+use lightning::log_error;
 use lightning::routing::gossip::{NetworkGraph, P2PGossipSync};
 use lightning::routing::utxo::{UtxoFuture, UtxoLookup, UtxoResult, UtxoLookupError};
 use lightning::util::logger::Logger;
@@ -21,41 +22,49 @@ pub(crate) struct ChainVerifier<L: Deref + Clone + Send + Sync + 'static> where
 	graph: Arc<NetworkGraph<L>>,
 	outbound_gossiper: Arc<P2PGossipSync<Arc<NetworkGraph<L>>, Arc<Self>, L>>,
 	peer_handler: Mutex<Option<GossipPeerManager<L>>>,
+	logger: L
 }
 
 struct RestBinaryResponse(Vec<u8>);
 
 impl<L: Deref + Clone + Send + Sync + 'static> ChainVerifier<L> where L::Target: Logger {
-	pub(crate) fn new(graph: Arc<NetworkGraph<L>>, outbound_gossiper: Arc<P2PGossipSync<Arc<NetworkGraph<L>>, Arc<Self>, L>>) -> Self {
+	pub(crate) fn new(graph: Arc<NetworkGraph<L>>, outbound_gossiper: Arc<P2PGossipSync<Arc<NetworkGraph<L>>, Arc<Self>, L>>, logger: L) -> Self {
 		ChainVerifier {
 			rest_client: Arc::new(RestClient::new(config::bitcoin_rest_endpoint()).unwrap()),
 			outbound_gossiper,
 			graph,
 			peer_handler: Mutex::new(None),
+			logger
 		}
 	}
 	pub(crate) fn set_ph(&self, peer_handler: GossipPeerManager<L>) {
 		*self.peer_handler.lock().unwrap() = Some(peer_handler);
 	}
 
-	async fn retrieve_utxo(client: Arc<RestClient>, short_channel_id: u64) -> Result<TxOut, UtxoLookupError> {
+	async fn retrieve_utxo(client: Arc<RestClient>, short_channel_id: u64, logger: L) -> Result<TxOut, UtxoLookupError> {
 		let block_height = (short_channel_id >> 5 * 8) as u32; // block height is most significant three bytes
 		let transaction_index = ((short_channel_id >> 2 * 8) & 0xffffff) as u32;
 		let output_index = (short_channel_id & 0xffff) as u16;
 
-		let mut block = Self::retrieve_block(client, block_height).await?;
-		if transaction_index as usize >= block.txdata.len() { return Err(UtxoLookupError::UnknownTx); }
+		let mut block = Self::retrieve_block(client, block_height, logger.clone()).await?;
+		if transaction_index as usize >= block.txdata.len() {
+			log_error!(logger, "Could't find transaction {} in block {}", transaction_index, block_height);
+			return Err(UtxoLookupError::UnknownTx);
+		}
 		let mut transaction = block.txdata.swap_remove(transaction_index as usize);
-		if output_index as usize >= transaction.output.len() { return Err(UtxoLookupError::UnknownTx); }
+		if output_index as usize >= transaction.output.len() {
+			log_error!(logger, "Could't find output {} in transaction {}", output_index, transaction.txid());
+			return Err(UtxoLookupError::UnknownTx);
+		}
 		Ok(transaction.output.swap_remove(output_index as usize))
 	}
 
-	async fn retrieve_block(client: Arc<RestClient>, block_height: u32) -> Result<Block, UtxoLookupError> {
+	async fn retrieve_block(client: Arc<RestClient>, block_height: u32, logger: L) -> Result<Block, UtxoLookupError> {
 		let uri = format!("blockhashbyheight/{}.bin", block_height);
 		let block_hash_result =
 			client.request_resource::<BinaryResponse, RestBinaryResponse>(&uri).await;
 		let block_hash: Vec<u8> = block_hash_result.map_err(|error| {
-			eprintln!("Could't find block hash at height {}: {}", block_height, error.to_string());
+			log_error!(logger, "Could't find block hash at height {}: {}", block_height, error.to_string());
 			UtxoLookupError::UnknownChain
 		})?.0;
 		let block_hash = BlockHash::from_slice(&block_hash).unwrap();
@@ -67,7 +76,7 @@ impl<L: Deref + Clone + Send + Sync + 'static> ChainVerifier<L> where L::Target:
 			},
 			Ok(_) => unreachable!(),
 			Err(error) => {
-				eprintln!("Couldn't retrieve block {}: {:?} ({})", block_height, error, block_hash);
+				log_error!(logger, "Couldn't retrieve block {}: {:?} ({})", block_height, error, block_hash);
 				Err(UtxoLookupError::UnknownChain)
 			}
 		}
@@ -82,8 +91,9 @@ impl<L: Deref + Clone + Send + Sync + 'static> UtxoLookup for ChainVerifier<L> w
 		let client_ref = Arc::clone(&self.rest_client);
 		let gossip_ref = Arc::clone(&self.outbound_gossiper);
 		let pm_ref = self.peer_handler.lock().unwrap().clone();
+		let logger_ref = self.logger.clone();
 		tokio::spawn(async move {
-			let res = Self::retrieve_utxo(client_ref, short_channel_id).await;
+			let res = Self::retrieve_utxo(client_ref, short_channel_id, logger_ref).await;
 			fut.resolve(&*graph_ref, &*gossip_ref, res);
 			if let Some(pm) = pm_ref { pm.process_events(); }
 		});
-- 
2.30.2