X-Git-Url: http://git.bitcoin.ninja/index.cgi?a=blobdiff_plain;f=lightning%2Fsrc%2Fln%2Ffunctional_tests.rs;h=35ecd66cc713701420940e177a093092761d059f;hb=b8e9e8b83467182a9d66ba10eea5b1ccfaa59410;hp=fc527ddce954fe0dc6dcb9ec693b741ee8424270;hpb=a1fedeaec2c551ac4bb3cb2362daef3d81f9e765;p=rust-lightning

diff --git a/lightning/src/ln/functional_tests.rs b/lightning/src/ln/functional_tests.rs
index fc527ddc..35ecd66c 100644
--- a/lightning/src/ln/functional_tests.rs
+++ b/lightning/src/ln/functional_tests.rs
@@ -8190,6 +8190,43 @@ fn test_bump_txn_sanitize_tracking_maps() {
 	}
 }
 
+#[test]
+fn test_pending_claimed_htlc_no_balance_underflow() {
+	// Tests that if we have a pending outbound HTLC as well as a claimed-but-not-fully-removed
+	// HTLC we will not underflow when we call `Channel::get_balance_msat()`.
+	let chanmon_cfgs = create_chanmon_cfgs(2);
+	let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
+	let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
+	let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
+	create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 100_000, 0, InitFeatures::known(), InitFeatures::known());
+
+	let payment_preimage = route_payment(&nodes[0], &[&nodes[1]], 1_010_000).0;
+	nodes[1].node.claim_funds(payment_preimage);
+	check_added_monitors!(nodes[1], 1);
+	let fulfill_ev = get_htlc_update_msgs!(nodes[1], nodes[0].node.get_our_node_id());
+
+	nodes[0].node.handle_update_fulfill_htlc(&nodes[1].node.get_our_node_id(), &fulfill_ev.update_fulfill_htlcs[0]);
+	expect_payment_sent_without_paths!(nodes[0], payment_preimage);
+	nodes[0].node.handle_commitment_signed(&nodes[1].node.get_our_node_id(), &fulfill_ev.commitment_signed);
+	check_added_monitors!(nodes[0], 1);
+	let (_raa, _cs) = get_revoke_commit_msgs!(nodes[0], nodes[1].node.get_our_node_id());
+
+	// At this point nodes[1] has received 1,010k msat (10k msat more than their reserve) and can
+	// send an HTLC back (though it will go in the holding cell). Send an HTLC back and check we
+	// can get our balance.
+
+	// Get a route from nodes[1] to nodes[0] by getting a route going the other way and then flip
+	// the public key of the only hop. This works around ChannelDetails not showing the
+	// almost-claimed HTLC as available balance.
+	let (mut route, _, _, _) = get_route_and_payment_hash!(nodes[0], nodes[1], 10_000);
+	route.payment_params = None; // This is all wrong, but unnecessary
+	route.paths[0][0].pubkey = nodes[0].node.get_our_node_id();
+	let (_, payment_hash_2, payment_secret_2) = get_payment_preimage_hash!(nodes[0]);
+	nodes[1].node.send_payment(&route, payment_hash_2, &Some(payment_secret_2)).unwrap();
+
+	assert_eq!(nodes[1].node.list_channels()[0].balance_msat, 1_000_000);
+}
+
 #[test]
 fn test_channel_conf_timeout() {
 	// Tests that, for inbound channels, we give up on them if the funding transaction does not