Refactor features a bit more and fix endianness.

The spec is a bit mum on feature endianness, so I suppose it falls
under the "everything is big endian unless otherwise specified"
clause, but we were treating it as little. Further, the
Features::new() method is nonsense - we introduce an empty() and a
our_features() instead.

Author: TheBlueMatt

fuzz/src/chanmon_consistency.rs

@@ -252,7 +252,7 @@ pub fn do_test(data: &[u8]) {
 				} else { panic!("Wrong event type"); }
 			};
 
-			$dest.handle_open_channel(&$source.get_our_node_id(), Features::<FeatureContextInit>::new(), &open_channel);
+			$dest.handle_open_channel(&$source.get_our_node_id(), Features::<FeatureContextInit>::supported(), &open_channel);
 			let accept_channel = {
 				let events = $dest.get_and_clear_pending_msg_events();
 				assert_eq!(events.len(), 1);
@@ -261,7 +261,7 @@ pub fn do_test(data: &[u8]) {
 				} else { panic!("Wrong event type"); }
 			};
 
-			$source.handle_accept_channel(&$dest.get_our_node_id(), Features::<FeatureContextInit>::new(), &accept_channel);
+			$source.handle_accept_channel(&$dest.get_our_node_id(), Features::<FeatureContextInit>::supported(), &accept_channel);
 			{
 				let events = $source.get_and_clear_pending_events();
 				assert_eq!(events.len(), 1);

lightning/src/ln/chanmon_update_fail_tests.rs

@@ -19,7 +19,7 @@ use ln::functional_test_utils::*;
 fn test_simple_monitor_permanent_update_fail() {
 	// Test that we handle a simple permanent monitor update failure
 	let mut nodes = create_network(2, &[None, None]);
-	create_announced_chan_between_nodes(&nodes, 0, 1, Features::<FeatureContextInit>::new(), Features::<FeatureContextInit>::new());
+	create_announced_chan_between_nodes(&nodes, 0, 1, Features::<FeatureContextInit>::supported(), Features::<FeatureContextInit>::supported());
 
 	let route = nodes[0].router.get_route(&nodes[1].node.get_our_node_id(), None, &Vec::new(), 1000000, TEST_FINAL_CLTV).unwrap();
 	let (_, payment_hash_1) = get_payment_preimage_hash!(nodes[0]);
@@ -49,7 +49,7 @@ fn do_test_simple_monitor_temporary_update_fail(disconnect: bool) {
 	// Test that we can recover from a simple temporary monitor update failure optionally with
 	// a disconnect in between
 	let mut nodes = create_network(2, &[None, None]);
-	create_announced_chan_between_nodes(&nodes, 0, 1, Features::<FeatureContextInit>::new(), Features::<FeatureContextInit>::new());
+	create_announced_chan_between_nodes(&nodes, 0, 1, Features::<FeatureContextInit>::supported(), Features::<FeatureContextInit>::supported());
 
 	let route = nodes[0].router.get_route(&nodes[1].node.get_our_node_id(), None, &Vec::new(), 1000000, TEST_FINAL_CLTV).unwrap();
 	let (payment_preimage_1, payment_hash_1) = get_payment_preimage_hash!(nodes[0]);
@@ -148,7 +148,7 @@ fn do_test_monitor_temporary_update_fail(disconnect_count: usize) {
 	//   through, swapping message ordering based on disconnect_count & 8 and optionally
 	//   disconnect/reconnecting based on disconnect_count.
 	let mut nodes = create_network(2, &[None, None]);
-	create_announced_chan_between_nodes(&nodes, 0, 1, Features::<FeatureContextInit>::new(), Features::<FeatureContextInit>::new());
+	create_announced_chan_between_nodes(&nodes, 0, 1, Features::<FeatureContextInit>::supported(), Features::<FeatureContextInit>::supported());
 
 	let (payment_preimage_1, _) = route_payment(&nodes[0], &[&nodes[1]], 1000000);
 
@@ -474,7 +474,7 @@ fn test_monitor_temporary_update_fail_c() {
 fn test_monitor_update_fail_cs() {
 	// Tests handling of a monitor update failure when processing an incoming commitment_signed
 	let mut nodes = create_network(2, &[None, None]);
-	create_announced_chan_between_nodes(&nodes, 0, 1, Features::<FeatureContextInit>::new(), Features::<FeatureContextInit>::new());
+	create_announced_chan_between_nodes(&nodes, 0, 1, Features::<FeatureContextInit>::supported(), Features::<FeatureContextInit>::supported());
 
 	let route = nodes[0].router.get_route(&nodes[1].node.get_our_node_id(), None, &Vec::new(), 1000000, TEST_FINAL_CLTV).unwrap();
 	let (payment_preimage, our_payment_hash) = get_payment_preimage_hash!(nodes[0]);
@@ -553,7 +553,7 @@ fn test_monitor_update_fail_no_rebroadcast() {
 	// test_restore_channel_monitor() is required. Backported from
 	// chanmon_fail_consistency fuzz tests.
 	let mut nodes = create_network(2, &[None, None]);
-	create_announced_chan_between_nodes(&nodes, 0, 1, Features::<FeatureContextInit>::new(), Features::<FeatureContextInit>::new());
+	create_announced_chan_between_nodes(&nodes, 0, 1, Features::<FeatureContextInit>::supported(), Features::<FeatureContextInit>::supported());
 
 	let route = nodes[0].router.get_route(&nodes[1].node.get_our_node_id(), None, &Vec::new(), 1000000, TEST_FINAL_CLTV).unwrap();
 	let (payment_preimage_1, our_payment_hash) = get_payment_preimage_hash!(nodes[0]);
@@ -595,7 +595,7 @@ fn test_monitor_update_raa_while_paused() {
 	// Tests handling of an RAA while monitor updating has already been marked failed.
 	// Backported from chanmon_fail_consistency fuzz tests as this used to be broken.
 	let mut nodes = create_network(2, &[None, None]);
-	create_announced_chan_between_nodes(&nodes, 0, 1, Features::<FeatureContextInit>::new(), Features::<FeatureContextInit>::new());
+	create_announced_chan_between_nodes(&nodes, 0, 1, Features::<FeatureContextInit>::supported(), Features::<FeatureContextInit>::supported());
 
 	send_payment(&nodes[0], &[&nodes[1]], 5000000, 5_000_000);
 
@@ -662,8 +662,8 @@ fn test_monitor_update_raa_while_paused() {
 fn do_test_monitor_update_fail_raa(test_ignore_second_cs: bool) {
 	// Tests handling of a monitor update failure when processing an incoming RAA
 	let mut nodes = create_network(3, &[None, None, None]);
-	create_announced_chan_between_nodes(&nodes, 0, 1, Features::<FeatureContextInit>::new(), Features::<FeatureContextInit>::new());
-	let chan_2 = create_announced_chan_between_nodes(&nodes, 1, 2, Features::<FeatureContextInit>::new(), Features::<FeatureContextInit>::new());
+	create_announced_chan_between_nodes(&nodes, 0, 1, Features::<FeatureContextInit>::supported(), Features::<FeatureContextInit>::supported());
+	let chan_2 = create_announced_chan_between_nodes(&nodes, 1, 2, Features::<FeatureContextInit>::supported(), Features::<FeatureContextInit>::supported());
 
 	// Rebalance a bit so that we can send backwards from 2 to 1.
 	send_payment(&nodes[0], &[&nodes[1], &nodes[2]], 5000000, 5_000_000);
@@ -915,8 +915,8 @@ fn test_monitor_update_fail_reestablish() {
 	// channel_reestablish generating a monitor update (which comes from freeing holding cell
 	// HTLCs).
 	let mut nodes = create_network(3, &[None, None, None]);
-	create_announced_chan_between_nodes(&nodes, 0, 1, Features::<FeatureContextInit>::new(), Features::<FeatureContextInit>::new());
-	create_announced_chan_between_nodes(&nodes, 1, 2, Features::<FeatureContextInit>::new(), Features::<FeatureContextInit>::new());
+	create_announced_chan_between_nodes(&nodes, 0, 1, Features::<FeatureContextInit>::supported(), Features::<FeatureContextInit>::supported());
+	create_announced_chan_between_nodes(&nodes, 1, 2, Features::<FeatureContextInit>::supported(), Features::<FeatureContextInit>::supported());
 
 	let (our_payment_preimage, _) = route_payment(&nodes[0], &[&nodes[1], &nodes[2]], 1000000);
 
@@ -993,7 +993,7 @@ fn raa_no_response_awaiting_raa_state() {
 	// in question (assuming it intends to respond with a CS after monitor updating is restored).
 	// Backported from chanmon_fail_consistency fuzz tests as this used to be broken.
 	let mut nodes = create_network(2, &[None, None]);
-	create_announced_chan_between_nodes(&nodes, 0, 1, Features::<FeatureContextInit>::new(), Features::<FeatureContextInit>::new());
+	create_announced_chan_between_nodes(&nodes, 0, 1, Features::<FeatureContextInit>::supported(), Features::<FeatureContextInit>::supported());
 
 	let route = nodes[0].router.get_route(&nodes[1].node.get_our_node_id(), None, &Vec::new(), 1000000, TEST_FINAL_CLTV).unwrap();
 	let (payment_preimage_1, payment_hash_1) = get_payment_preimage_hash!(nodes[0]);
@@ -1106,7 +1106,7 @@ fn claim_while_disconnected_monitor_update_fail() {
 	// code introduced a regression in this test (specifically, this caught a removal of the
 	// channel_reestablish handling ensuring the order was sensical given the messages used).
 	let mut nodes = create_network(2, &[None, None]);
-	create_announced_chan_between_nodes(&nodes, 0, 1, Features::<FeatureContextInit>::new(), Features::<FeatureContextInit>::new());
+	create_announced_chan_between_nodes(&nodes, 0, 1, Features::<FeatureContextInit>::supported(), Features::<FeatureContextInit>::supported());
 
 	// Forward a payment for B to claim
 	let (payment_preimage_1, _) = route_payment(&nodes[0], &[&nodes[1]], 1000000);
@@ -1221,7 +1221,7 @@ fn monitor_failed_no_reestablish_response() {
 	// Backported from chanmon_fail_consistency fuzz tests as it caught a long-standing
 	// debug_assert!() failure in channel_reestablish handling.
 	let mut nodes = create_network(2, &[None, None]);
-	create_announced_chan_between_nodes(&nodes, 0, 1, Features::<FeatureContextInit>::new(), Features::<FeatureContextInit>::new());
+	create_announced_chan_between_nodes(&nodes, 0, 1, Features::<FeatureContextInit>::supported(), Features::<FeatureContextInit>::supported());
 
 	// Route the payment and deliver the initial commitment_signed (with a monitor update failure
 	// on receipt).
@@ -1287,7 +1287,7 @@ fn first_message_on_recv_ordering() {
 	// payment applied).
 	// Backported from chanmon_fail_consistency fuzz tests as it caught a bug here.
 	let mut nodes = create_network(2, &[None, None]);
-	create_announced_chan_between_nodes(&nodes, 0, 1, Features::<FeatureContextInit>::new(), Features::<FeatureContextInit>::new());
+	create_announced_chan_between_nodes(&nodes, 0, 1, Features::<FeatureContextInit>::supported(), Features::<FeatureContextInit>::supported());
 
 	// Route the first payment outbound, holding the last RAA for B until we are set up so that we
 	// can deliver it and fail the monitor update.
@@ -1372,8 +1372,8 @@ fn test_monitor_update_fail_claim() {
 	// payment from B to A fail due to the paused channel. Finally, we restore the channel monitor
 	// updating and claim the payment on B.
 	let mut nodes = create_network(3, &[None, None, None]);
-	let chan_1 = create_announced_chan_between_nodes(&nodes, 0, 1, Features::<FeatureContextInit>::new(), Features::<FeatureContextInit>::new());
-	create_announced_chan_between_nodes(&nodes, 1, 2, Features::<FeatureContextInit>::new(), Features::<FeatureContextInit>::new());
+	let chan_1 = create_announced_chan_between_nodes(&nodes, 0, 1, Features::<FeatureContextInit>::supported(), Features::<FeatureContextInit>::supported());
+	create_announced_chan_between_nodes(&nodes, 1, 2, Features::<FeatureContextInit>::supported(), Features::<FeatureContextInit>::supported());
 
 	// Rebalance a bit so that we can send backwards from 3 to 2.
 	send_payment(&nodes[0], &[&nodes[1], &nodes[2]], 5000000, 5_000_000);
@@ -1445,8 +1445,8 @@ fn test_monitor_update_on_pending_forwards() {
 	// The payment from A to C will be failed by C and pending a back-fail to A, while the payment
 	// from C to A will be pending a forward to A.
 	let mut nodes = create_network(3, &[None, None, None]);
-	create_announced_chan_between_nodes(&nodes, 0, 1, Features::<FeatureContextInit>::new(), Features::<FeatureContextInit>::new());
-	create_announced_chan_between_nodes(&nodes, 1, 2, Features::<FeatureContextInit>::new(), Features::<FeatureContextInit>::new());
+	create_announced_chan_between_nodes(&nodes, 0, 1, Features::<FeatureContextInit>::supported(), Features::<FeatureContextInit>::supported());
+	create_announced_chan_between_nodes(&nodes, 1, 2, Features::<FeatureContextInit>::supported(), Features::<FeatureContextInit>::supported());
 
 	// Rebalance a bit so that we can send backwards from 3 to 1.
 	send_payment(&nodes[0], &[&nodes[1], &nodes[2]], 5000000, 5_000_000);
@@ -1510,7 +1510,7 @@ fn monitor_update_claim_fail_no_response() {
 	// Backported from chanmon_fail_consistency fuzz tests as an unmerged version of the handling
 	// code was broken.
 	let mut nodes = create_network(2, &[None, None]);
-	create_announced_chan_between_nodes(&nodes, 0, 1, Features::<FeatureContextInit>::new(), Features::<FeatureContextInit>::new());
+	create_announced_chan_between_nodes(&nodes, 0, 1, Features::<FeatureContextInit>::supported(), Features::<FeatureContextInit>::supported());
 
 	// Forward a payment for B to claim
 	let (payment_preimage_1, _) = route_payment(&nodes[0], &[&nodes[1]], 1000000);
@@ -1571,8 +1571,8 @@ fn do_during_funding_monitor_fail(fail_on_generate: bool, restore_between_fails:
 	let mut nodes = create_network(2, &[None, None]);
 
 	nodes[0].node.create_channel(nodes[1].node.get_our_node_id(), 100000, 10001, 43).unwrap();
-	nodes[1].node.handle_open_channel(&nodes[0].node.get_our_node_id(), Features::<FeatureContextInit>::new(), &get_event_msg!(nodes[0], MessageSendEvent::SendOpenChannel, nodes[1].node.get_our_node_id()));
-	nodes[0].node.handle_accept_channel(&nodes[1].node.get_our_node_id(), Features::<FeatureContextInit>::new(), &get_event_msg!(nodes[1], MessageSendEvent::SendAcceptChannel, nodes[0].node.get_our_node_id()));
+	nodes[1].node.handle_open_channel(&nodes[0].node.get_our_node_id(), Features::<FeatureContextInit>::supported(), &get_event_msg!(nodes[0], MessageSendEvent::SendOpenChannel, nodes[1].node.get_our_node_id()));
+	nodes[0].node.handle_accept_channel(&nodes[1].node.get_our_node_id(), Features::<FeatureContextInit>::supported(), &get_event_msg!(nodes[1], MessageSendEvent::SendAcceptChannel, nodes[0].node.get_our_node_id()));
 
 	let (temporary_channel_id, funding_tx, funding_output) = create_funding_transaction(&nodes[0], 100000, 43);
 

lightning/src/ln/channel.rs

@@ -3225,7 +3225,7 @@ impl<ChanSigner: ChannelKeys> Channel<ChanSigner> {
 		let our_bitcoin_key = PublicKey::from_secret_key(&self.secp_ctx, self.local_keys.funding_key());
 
 		let msg = msgs::UnsignedChannelAnnouncement {
-			features: ChannelFeatures::new(),
+			features: ChannelFeatures::supported(),
 			chain_hash: chain_hash,
 			short_channel_id: self.get_short_channel_id().unwrap(),
 			node_id_1: if were_node_one { our_node_id } else { self.get_their_node_id() },