Add function for updating network graph with announcement with no UTXO resolver

Author: benthecarman

lightning/src/routing/gossip.rs

@@ -28,7 +28,7 @@ use crate::ln::msgs::{DecodeError, ErrorAction, Init, LightningError, RoutingMes
 use crate::ln::msgs::{ChannelAnnouncement, ChannelUpdate, NodeAnnouncement, GossipTimestampFilter};
 use crate::ln::msgs::{QueryChannelRange, ReplyChannelRange, QueryShortChannelIds, ReplyShortChannelIdsEnd};
 use crate::ln::msgs;
-use crate::routing::utxo::{self, UtxoLookup};
+use crate::routing::utxo::{self, UtxoLookup, UtxoResolver};
 use crate::util::ser::{Readable, ReadableArgs, Writeable, Writer, MaybeReadable};
 use crate::util::logger::{Logger, Level};
 use crate::util::scid_utils::{block_from_scid, scid_from_parts, MAX_SCID_BLOCK};
@@ -43,7 +43,7 @@ use core::convert::TryFrom;
 use crate::sync::{RwLock, RwLockReadGuard};
 #[cfg(feature = "std")]
 use core::sync::atomic::{AtomicUsize, Ordering};
-use crate::sync::Mutex;
+use crate::sync::{Arc, Mutex};
 use core::ops::{Bound, Deref};
 use core::str::FromStr;
 
@@ -1458,6 +1458,19 @@ impl<L: Deref> NetworkGraph<L> where L::Target: Logger {
 		self.update_channel_from_unsigned_announcement_intern(&msg.contents, Some(msg), utxo_lookup)
 	}
 
+	/// Store or update channel info from a channel announcement.
+	///
+	/// You probably don't want to call this directly, instead relying on a P2PGossipSync's
+	/// RoutingMessageHandler implementation to call it indirectly. This may be useful to accept
+	/// routing messages from a source using a protocol other than the lightning P2P protocol.
+	///
+	/// This will skip verification of if the channel is actually on-chain.
+	pub fn update_channel_from_announcement_no_lookup(
+		&self, msg: &ChannelAnnouncement
+	) -> Result<(), LightningError> {
+		self.update_channel_from_announcement::<Arc<UtxoResolver>>(msg, &None)
+	}
+
 	/// Store or update channel info from a channel announcement without verifying the associated
 	/// signatures. Because we aren't given the associated signatures here we cannot relay the
 	/// channel announcement to any of our peers.

lightning/src/routing/utxo.rs

@@ -125,7 +125,7 @@ pub struct UtxoFuture {
 
 /// A trivial implementation of [`UtxoLookup`] which is used to call back into the network graph
 /// once we have a concrete resolution of a request.
-struct UtxoResolver(Result<TxOut, UtxoLookupError>);
+pub(crate) struct UtxoResolver(Result<TxOut, UtxoLookupError>);
 impl UtxoLookup for UtxoResolver {
 	fn get_utxo(&self, _genesis_hash: &BlockHash, _short_channel_id: u64) -> UtxoResult {
 		UtxoResult::Sync(self.0.clone())