Merge pull request #2319 from valentinewallace/2023-05-forward-less-than-onion
[rust-lightning] / lightning / src / ln / channel.rs
index 7da903f4e0c2f33b20d7cf3973acf65fe24b3aac..388ef6a8b306f07500eff3d6eece76eebfe79dab 100644 (file)
@@ -224,6 +224,7 @@ struct OutboundHTLCOutput {
        payment_hash: PaymentHash,
        state: OutboundHTLCState,
        source: HTLCSource,
+       skimmed_fee_msat: Option<u64>,
 }
 
 /// See AwaitingRemoteRevoke ChannelState for more info
@@ -235,6 +236,8 @@ enum HTLCUpdateAwaitingACK {
                payment_hash: PaymentHash,
                source: HTLCSource,
                onion_routing_packet: msgs::OnionPacket,
+               // The extra fee we're skimming off the top of this HTLC.
+               skimmed_fee_msat: Option<u64>,
        },
        ClaimHTLC {
                payment_preimage: PaymentPreimage,
@@ -1422,7 +1425,7 @@ impl<Signer: ChannelSigner> ChannelContext<Signer> {
 
        /// Gets the redeemscript for the funding transaction output (ie the funding transaction output
        /// pays to get_funding_redeemscript().to_v0_p2wsh()).
-       /// Panics if called before accept_channel/new_from_req
+       /// Panics if called before accept_channel/InboundV1Channel::new
        pub fn get_funding_redeemscript(&self) -> Script {
                make_funding_redeemscript(&self.get_holder_pubkeys().funding_pubkey, self.counterparty_funding_pubkey())
        }
@@ -3052,8 +3055,13 @@ impl<Signer: WriteableEcdsaChannelSigner> Channel<Signer> {
                                // handling this case better and maybe fulfilling some of the HTLCs while attempting
                                // to rebalance channels.
                                match &htlc_update {
-                                       &HTLCUpdateAwaitingACK::AddHTLC {amount_msat, cltv_expiry, ref payment_hash, ref source, ref onion_routing_packet, ..} => {
-                                               match self.send_htlc(amount_msat, *payment_hash, cltv_expiry, source.clone(), onion_routing_packet.clone(), false, logger) {
+                                       &HTLCUpdateAwaitingACK::AddHTLC {
+                                               amount_msat, cltv_expiry, ref payment_hash, ref source, ref onion_routing_packet,
+                                               skimmed_fee_msat, ..
+                                       } => {
+                                               match self.send_htlc(amount_msat, *payment_hash, cltv_expiry, source.clone(),
+                                                       onion_routing_packet.clone(), false, skimmed_fee_msat, logger)
+                                               {
                                                        Ok(update_add_msg_option) => update_add_htlcs.push(update_add_msg_option.unwrap()),
                                                        Err(e) => {
                                                                match e {
@@ -3695,6 +3703,7 @@ impl<Signer: WriteableEcdsaChannelSigner> Channel<Signer> {
                                        payment_hash: htlc.payment_hash,
                                        cltv_expiry: htlc.cltv_expiry,
                                        onion_routing_packet: (**onion_packet).clone(),
+                                       skimmed_fee_msat: htlc.skimmed_fee_msat,
                                });
                        }
                }
@@ -5042,11 +5051,13 @@ impl<Signer: WriteableEcdsaChannelSigner> Channel<Signer> {
        /// commitment update.
        ///
        /// `Err`s will only be [`ChannelError::Ignore`].
-       pub fn queue_add_htlc<L: Deref>(&mut self, amount_msat: u64, payment_hash: PaymentHash, cltv_expiry: u32, source: HTLCSource,
-               onion_routing_packet: msgs::OnionPacket, logger: &L)
-       -> Result<(), ChannelError> where L::Target: Logger {
+       pub fn queue_add_htlc<L: Deref>(
+               &mut self, amount_msat: u64, payment_hash: PaymentHash, cltv_expiry: u32, source: HTLCSource,
+               onion_routing_packet: msgs::OnionPacket, skimmed_fee_msat: Option<u64>, logger: &L
+       ) -> Result<(), ChannelError> where L::Target: Logger {
                self
-                       .send_htlc(amount_msat, payment_hash, cltv_expiry, source, onion_routing_packet, true, logger)
+                       .send_htlc(amount_msat, payment_hash, cltv_expiry, source, onion_routing_packet, true,
+                               skimmed_fee_msat, logger)
                        .map(|msg_opt| assert!(msg_opt.is_none(), "We forced holding cell?"))
                        .map_err(|err| {
                                if let ChannelError::Ignore(_) = err { /* fine */ }
@@ -5071,9 +5082,11 @@ impl<Signer: WriteableEcdsaChannelSigner> Channel<Signer> {
        /// on this [`Channel`] if `force_holding_cell` is false.
        ///
        /// `Err`s will only be [`ChannelError::Ignore`].
-       fn send_htlc<L: Deref>(&mut self, amount_msat: u64, payment_hash: PaymentHash, cltv_expiry: u32, source: HTLCSource,
-               onion_routing_packet: msgs::OnionPacket, mut force_holding_cell: bool, logger: &L)
-       -> Result<Option<msgs::UpdateAddHTLC>, ChannelError> where L::Target: Logger {
+       fn send_htlc<L: Deref>(
+               &mut self, amount_msat: u64, payment_hash: PaymentHash, cltv_expiry: u32, source: HTLCSource,
+               onion_routing_packet: msgs::OnionPacket, mut force_holding_cell: bool,
+               skimmed_fee_msat: Option<u64>, logger: &L
+       ) -> Result<Option<msgs::UpdateAddHTLC>, ChannelError> where L::Target: Logger {
                if (self.context.channel_state & (ChannelState::ChannelReady as u32 | BOTH_SIDES_SHUTDOWN_MASK)) != (ChannelState::ChannelReady as u32) {
                        return Err(ChannelError::Ignore("Cannot send HTLC until channel is fully established and we haven't started shutting down".to_owned()));
                }
@@ -5125,6 +5138,7 @@ impl<Signer: WriteableEcdsaChannelSigner> Channel<Signer> {
                                cltv_expiry,
                                source,
                                onion_routing_packet,
+                               skimmed_fee_msat,
                        });
                        return Ok(None);
                }
@@ -5136,6 +5150,7 @@ impl<Signer: WriteableEcdsaChannelSigner> Channel<Signer> {
                        cltv_expiry,
                        state: OutboundHTLCState::LocalAnnounced(Box::new(onion_routing_packet.clone())),
                        source,
+                       skimmed_fee_msat,
                });
 
                let res = msgs::UpdateAddHTLC {
@@ -5145,6 +5160,7 @@ impl<Signer: WriteableEcdsaChannelSigner> Channel<Signer> {
                        payment_hash,
                        cltv_expiry,
                        onion_routing_packet,
+                       skimmed_fee_msat,
                };
                self.context.next_holder_htlc_id += 1;
 
@@ -5283,8 +5299,12 @@ impl<Signer: WriteableEcdsaChannelSigner> Channel<Signer> {
        ///
        /// Shorthand for calling [`Self::send_htlc`] followed by a commitment update, see docs on
        /// [`Self::send_htlc`] and [`Self::build_commitment_no_state_update`] for more info.
-       pub fn send_htlc_and_commit<L: Deref>(&mut self, amount_msat: u64, payment_hash: PaymentHash, cltv_expiry: u32, source: HTLCSource, onion_routing_packet: msgs::OnionPacket, logger: &L) -> Result<Option<&ChannelMonitorUpdate>, ChannelError> where L::Target: Logger {
-               let send_res = self.send_htlc(amount_msat, payment_hash, cltv_expiry, source, onion_routing_packet, false, logger);
+       pub fn send_htlc_and_commit<L: Deref>(
+               &mut self, amount_msat: u64, payment_hash: PaymentHash, cltv_expiry: u32, source: HTLCSource,
+               onion_routing_packet: msgs::OnionPacket, skimmed_fee_msat: Option<u64>, logger: &L
+       ) -> Result<Option<&ChannelMonitorUpdate>, ChannelError> where L::Target: Logger {
+               let send_res = self.send_htlc(amount_msat, payment_hash, cltv_expiry, source,
+                       onion_routing_packet, false, skimmed_fee_msat, logger);
                if let Err(e) = &send_res { if let ChannelError::Ignore(_) = e {} else { debug_assert!(false, "Sending cannot trigger channel failure"); } }
                match send_res? {
                        Some(_) => {
@@ -5935,7 +5955,7 @@ pub(super) struct InboundV1Channel<Signer: ChannelSigner> {
 impl<Signer: WriteableEcdsaChannelSigner> InboundV1Channel<Signer> {
        /// Creates a new channel from a remote sides' request for one.
        /// Assumes chain_hash has already been checked and corresponds with what we expect!
-       pub fn new_from_req<ES: Deref, SP: Deref, F: Deref, L: Deref>(
+       pub fn new<ES: Deref, SP: Deref, F: Deref, L: Deref>(
                fee_estimator: &LowerBoundedFeeEstimator<F>, entropy_source: &ES, signer_provider: &SP,
                counterparty_node_id: PublicKey, our_supported_features: &ChannelTypeFeatures,
                their_features: &InitFeatures, msg: &msgs::OpenChannel, user_id: u128, config: &UserConfig,
@@ -6265,7 +6285,7 @@ impl<Signer: WriteableEcdsaChannelSigner> InboundV1Channel<Signer> {
                Ok(chan)
        }
 
-       pub fn inbound_is_awaiting_accept(&self) -> bool {
+       pub fn is_awaiting_accept(&self) -> bool {
                self.context.inbound_awaiting_accept
        }
 
@@ -6609,9 +6629,10 @@ impl<Signer: WriteableEcdsaChannelSigner> Writeable for Channel<Signer> {
                }
 
                let mut preimages: Vec<&Option<PaymentPreimage>> = vec![];
+               let mut pending_outbound_skimmed_fees: Vec<Option<u64>> = Vec::new();
 
                (self.context.pending_outbound_htlcs.len() as u64).write(writer)?;
-               for htlc in self.context.pending_outbound_htlcs.iter() {
+               for (idx, htlc) in self.context.pending_outbound_htlcs.iter().enumerate() {
                        htlc.htlc_id.write(writer)?;
                        htlc.amount_msat.write(writer)?;
                        htlc.cltv_expiry.write(writer)?;
@@ -6647,18 +6668,37 @@ impl<Signer: WriteableEcdsaChannelSigner> Writeable for Channel<Signer> {
                                        reason.write(writer)?;
                                }
                        }
+                       if let Some(skimmed_fee) = htlc.skimmed_fee_msat {
+                               if pending_outbound_skimmed_fees.is_empty() {
+                                       for _ in 0..idx { pending_outbound_skimmed_fees.push(None); }
+                               }
+                               pending_outbound_skimmed_fees.push(Some(skimmed_fee));
+                       } else if !pending_outbound_skimmed_fees.is_empty() {
+                               pending_outbound_skimmed_fees.push(None);
+                       }
                }
 
+               let mut holding_cell_skimmed_fees: Vec<Option<u64>> = Vec::new();
                (self.context.holding_cell_htlc_updates.len() as u64).write(writer)?;
-               for update in self.context.holding_cell_htlc_updates.iter() {
+               for (idx, update) in self.context.holding_cell_htlc_updates.iter().enumerate() {
                        match update {
-                               &HTLCUpdateAwaitingACK::AddHTLC { ref amount_msat, ref cltv_expiry, ref payment_hash, ref source, ref onion_routing_packet } => {
+                               &HTLCUpdateAwaitingACK::AddHTLC {
+                                       ref amount_msat, ref cltv_expiry, ref payment_hash, ref source, ref onion_routing_packet,
+                                       skimmed_fee_msat,
+                               } => {
                                        0u8.write(writer)?;
                                        amount_msat.write(writer)?;
                                        cltv_expiry.write(writer)?;
                                        payment_hash.write(writer)?;
                                        source.write(writer)?;
                                        onion_routing_packet.write(writer)?;
+
+                                       if let Some(skimmed_fee) = skimmed_fee_msat {
+                                               if holding_cell_skimmed_fees.is_empty() {
+                                                       for _ in 0..idx { holding_cell_skimmed_fees.push(None); }
+                                               }
+                                               holding_cell_skimmed_fees.push(Some(skimmed_fee));
+                                       } else if !holding_cell_skimmed_fees.is_empty() { holding_cell_skimmed_fees.push(None); }
                                },
                                &HTLCUpdateAwaitingACK::ClaimHTLC { ref payment_preimage, ref htlc_id } => {
                                        1u8.write(writer)?;
@@ -6825,6 +6865,8 @@ impl<Signer: WriteableEcdsaChannelSigner> Writeable for Channel<Signer> {
                        (29, self.context.temporary_channel_id, option),
                        (31, channel_pending_event_emitted, option),
                        (33, self.context.pending_monitor_updates, vec_type),
+                       (35, pending_outbound_skimmed_fees, optional_vec),
+                       (37, holding_cell_skimmed_fees, optional_vec),
                });
 
                Ok(())
@@ -6935,6 +6977,7 @@ impl<'a, 'b, 'c, ES: Deref, SP: Deref> ReadableArgs<(&'a ES, &'b SP, u32, &'c Ch
                                        },
                                        _ => return Err(DecodeError::InvalidValue),
                                },
+                               skimmed_fee_msat: None,
                        });
                }
 
@@ -6948,6 +6991,7 @@ impl<'a, 'b, 'c, ES: Deref, SP: Deref> ReadableArgs<(&'a ES, &'b SP, u32, &'c Ch
                                        payment_hash: Readable::read(reader)?,
                                        source: Readable::read(reader)?,
                                        onion_routing_packet: Readable::read(reader)?,
+                                       skimmed_fee_msat: None,
                                },
                                1 => HTLCUpdateAwaitingACK::ClaimHTLC {
                                        payment_preimage: Readable::read(reader)?,
@@ -7103,6 +7147,9 @@ impl<'a, 'b, 'c, ES: Deref, SP: Deref> ReadableArgs<(&'a ES, &'b SP, u32, &'c Ch
 
                let mut pending_monitor_updates = Some(Vec::new());
 
+               let mut pending_outbound_skimmed_fees_opt: Option<Vec<Option<u64>>> = None;
+               let mut holding_cell_skimmed_fees_opt: Option<Vec<Option<u64>>> = None;
+
                read_tlv_fields!(reader, {
                        (0, announcement_sigs, option),
                        (1, minimum_depth, option),
@@ -7126,6 +7173,8 @@ impl<'a, 'b, 'c, ES: Deref, SP: Deref> ReadableArgs<(&'a ES, &'b SP, u32, &'c Ch
                        (29, temporary_channel_id, option),
                        (31, channel_pending_event_emitted, option),
                        (33, pending_monitor_updates, vec_type),
+                       (35, pending_outbound_skimmed_fees_opt, optional_vec),
+                       (37, holding_cell_skimmed_fees_opt, optional_vec),
                });
 
                let (channel_keys_id, holder_signer) = if let Some(channel_keys_id) = channel_keys_id {
@@ -7180,6 +7229,25 @@ impl<'a, 'b, 'c, ES: Deref, SP: Deref> ReadableArgs<(&'a ES, &'b SP, u32, &'c Ch
 
                let holder_max_accepted_htlcs = holder_max_accepted_htlcs.unwrap_or(DEFAULT_MAX_HTLCS);
 
+               if let Some(skimmed_fees) = pending_outbound_skimmed_fees_opt {
+                       let mut iter = skimmed_fees.into_iter();
+                       for htlc in pending_outbound_htlcs.iter_mut() {
+                               htlc.skimmed_fee_msat = iter.next().ok_or(DecodeError::InvalidValue)?;
+                       }
+                       // We expect all skimmed fees to be consumed above
+                       if iter.next().is_some() { return Err(DecodeError::InvalidValue) }
+               }
+               if let Some(skimmed_fees) = holding_cell_skimmed_fees_opt {
+                       let mut iter = skimmed_fees.into_iter();
+                       for htlc in holding_cell_htlc_updates.iter_mut() {
+                               if let HTLCUpdateAwaitingACK::AddHTLC { ref mut skimmed_fee_msat, .. } = htlc {
+                                       *skimmed_fee_msat = iter.next().ok_or(DecodeError::InvalidValue)?;
+                               }
+                       }
+                       // We expect all skimmed fees to be consumed above
+                       if iter.next().is_some() { return Err(DecodeError::InvalidValue) }
+               }
+
                Ok(Channel {
                        context: ChannelContext {
                                user_id,
@@ -7481,7 +7549,7 @@ mod tests {
                // Make sure A's dust limit is as we expect.
                let open_channel_msg = node_a_chan.get_open_channel(genesis_block(network).header.block_hash());
                let node_b_node_id = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&[7; 32]).unwrap());
-               let mut node_b_chan = InboundV1Channel::<EnforcingSigner>::new_from_req(&feeest, &&keys_provider, &&keys_provider, node_b_node_id, &channelmanager::provided_channel_type_features(&config), &channelmanager::provided_init_features(&config), &open_channel_msg, 7, &config, 0, &&logger, 42).unwrap();
+               let mut node_b_chan = InboundV1Channel::<EnforcingSigner>::new(&feeest, &&keys_provider, &&keys_provider, node_b_node_id, &channelmanager::provided_channel_type_features(&config), &channelmanager::provided_init_features(&config), &open_channel_msg, 7, &config, 0, &&logger, 42).unwrap();
 
                // Node B --> Node A: accept channel, explicitly setting B's dust limit.
                let mut accept_channel_msg = node_b_chan.accept_inbound_channel(0);
@@ -7522,7 +7590,8 @@ mod tests {
                                session_priv: SecretKey::from_slice(&hex::decode("0fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff").unwrap()[..]).unwrap(),
                                first_hop_htlc_msat: 548,
                                payment_id: PaymentId([42; 32]),
-                       }
+                       },
+                       skimmed_fee_msat: None,
                });
 
                // Make sure when Node A calculates their local commitment transaction, none of the HTLCs pass
@@ -7609,7 +7678,7 @@ mod tests {
                // Create Node B's channel by receiving Node A's open_channel message
                let open_channel_msg = node_a_chan.get_open_channel(chain_hash);
                let node_b_node_id = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&[7; 32]).unwrap());
-               let mut node_b_chan = InboundV1Channel::<EnforcingSigner>::new_from_req(&feeest, &&keys_provider, &&keys_provider, node_b_node_id, &channelmanager::provided_channel_type_features(&config), &channelmanager::provided_init_features(&config), &open_channel_msg, 7, &config, 0, &&logger, 42).unwrap();
+               let mut node_b_chan = InboundV1Channel::<EnforcingSigner>::new(&feeest, &&keys_provider, &&keys_provider, node_b_node_id, &channelmanager::provided_channel_type_features(&config), &channelmanager::provided_init_features(&config), &open_channel_msg, 7, &config, 0, &&logger, 42).unwrap();
 
                // Node B --> Node A: accept channel
                let accept_channel_msg = node_b_chan.accept_inbound_channel(0);
@@ -7678,15 +7747,15 @@ mod tests {
 
                let chan_1_open_channel_msg = chan_1.get_open_channel(genesis_block(network).header.block_hash());
 
-               // Test that `new_from_req` creates a channel with the correct value for
+               // Test that `InboundV1Channel::new` creates a channel with the correct value for
                // `holder_max_htlc_value_in_flight_msat`, when configured with a valid percentage value,
                // which is set to the lower bound - 1 (2%) of the `channel_value`.
-               let chan_3 = InboundV1Channel::<EnforcingSigner>::new_from_req(&feeest, &&keys_provider, &&keys_provider, inbound_node_id, &channelmanager::provided_channel_type_features(&config_2_percent), &channelmanager::provided_init_features(&config_2_percent), &chan_1_open_channel_msg, 7, &config_2_percent, 0, &&logger, 42).unwrap();
+               let chan_3 = InboundV1Channel::<EnforcingSigner>::new(&feeest, &&keys_provider, &&keys_provider, inbound_node_id, &channelmanager::provided_channel_type_features(&config_2_percent), &channelmanager::provided_init_features(&config_2_percent), &chan_1_open_channel_msg, 7, &config_2_percent, 0, &&logger, 42).unwrap();
                let chan_3_value_msat = chan_3.context.channel_value_satoshis * 1000;
                assert_eq!(chan_3.context.holder_max_htlc_value_in_flight_msat, (chan_3_value_msat as f64 * 0.02) as u64);
 
                // Test with the upper bound - 1 of valid values (99%).
-               let chan_4 = InboundV1Channel::<EnforcingSigner>::new_from_req(&feeest, &&keys_provider, &&keys_provider, inbound_node_id, &channelmanager::provided_channel_type_features(&config_99_percent), &channelmanager::provided_init_features(&config_99_percent), &chan_1_open_channel_msg, 7, &config_99_percent, 0, &&logger, 42).unwrap();
+               let chan_4 = InboundV1Channel::<EnforcingSigner>::new(&feeest, &&keys_provider, &&keys_provider, inbound_node_id, &channelmanager::provided_channel_type_features(&config_99_percent), &channelmanager::provided_init_features(&config_99_percent), &chan_1_open_channel_msg, 7, &config_99_percent, 0, &&logger, 42).unwrap();
                let chan_4_value_msat = chan_4.context.channel_value_satoshis * 1000;
                assert_eq!(chan_4.context.holder_max_htlc_value_in_flight_msat, (chan_4_value_msat as f64 * 0.99) as u64);
 
@@ -7703,16 +7772,16 @@ mod tests {
                let chan_6_value_msat = chan_6.context.channel_value_satoshis * 1000;
                assert_eq!(chan_6.context.holder_max_htlc_value_in_flight_msat, chan_6_value_msat);
 
-               // Test that `new_from_req` uses the lower bound of the configurable percentage values (1%)
+               // Test that `InboundV1Channel::new` uses the lower bound of the configurable percentage values (1%)
                // if `max_inbound_htlc_value_in_flight_percent_of_channel` is set to a value less than 1.
-               let chan_7 = InboundV1Channel::<EnforcingSigner>::new_from_req(&feeest, &&keys_provider, &&keys_provider, inbound_node_id, &channelmanager::provided_channel_type_features(&config_0_percent), &channelmanager::provided_init_features(&config_0_percent), &chan_1_open_channel_msg, 7, &config_0_percent, 0, &&logger, 42).unwrap();
+               let chan_7 = InboundV1Channel::<EnforcingSigner>::new(&feeest, &&keys_provider, &&keys_provider, inbound_node_id, &channelmanager::provided_channel_type_features(&config_0_percent), &channelmanager::provided_init_features(&config_0_percent), &chan_1_open_channel_msg, 7, &config_0_percent, 0, &&logger, 42).unwrap();
                let chan_7_value_msat = chan_7.context.channel_value_satoshis * 1000;
                assert_eq!(chan_7.context.holder_max_htlc_value_in_flight_msat, (chan_7_value_msat as f64 * 0.01) as u64);
 
-               // Test that `new_from_req` uses the upper bound of the configurable percentage values
+               // Test that `InboundV1Channel::new` uses the upper bound of the configurable percentage values
                // (100%) if `max_inbound_htlc_value_in_flight_percent_of_channel` is set to a larger value
                // than 100.
-               let chan_8 = InboundV1Channel::<EnforcingSigner>::new_from_req(&feeest, &&keys_provider, &&keys_provider, inbound_node_id, &channelmanager::provided_channel_type_features(&config_101_percent), &channelmanager::provided_init_features(&config_101_percent), &chan_1_open_channel_msg, 7, &config_101_percent, 0, &&logger, 42).unwrap();
+               let chan_8 = InboundV1Channel::<EnforcingSigner>::new(&feeest, &&keys_provider, &&keys_provider, inbound_node_id, &channelmanager::provided_channel_type_features(&config_101_percent), &channelmanager::provided_init_features(&config_101_percent), &chan_1_open_channel_msg, 7, &config_101_percent, 0, &&logger, 42).unwrap();
                let chan_8_value_msat = chan_8.context.channel_value_satoshis * 1000;
                assert_eq!(chan_8.context.holder_max_htlc_value_in_flight_msat, chan_8_value_msat);
        }
@@ -7720,7 +7789,7 @@ mod tests {
        #[test]
        fn test_configured_holder_selected_channel_reserve_satoshis() {
 
-               // Test that `OutboundV1Channel::new` and `new_from_req` create a channel with the correct
+               // Test that `OutboundV1Channel::new` and `InboundV1Channel::new` create a channel with the correct
                // channel reserves, when `their_channel_reserve_proportional_millionths` is configured.
                test_self_and_counterparty_channel_reserve(10_000_000, 0.02, 0.02);
 
@@ -7762,7 +7831,7 @@ mod tests {
                inbound_node_config.channel_handshake_config.their_channel_reserve_proportional_millionths = (inbound_selected_channel_reserve_perc * 1_000_000.0) as u32;
 
                if outbound_selected_channel_reserve_perc + inbound_selected_channel_reserve_perc < 1.0 {
-                       let chan_inbound_node = InboundV1Channel::<EnforcingSigner>::new_from_req(&&fee_est, &&keys_provider, &&keys_provider, inbound_node_id, &channelmanager::provided_channel_type_features(&inbound_node_config), &channelmanager::provided_init_features(&outbound_node_config), &chan_open_channel_msg, 7, &inbound_node_config, 0, &&logger, 42).unwrap();
+                       let chan_inbound_node = InboundV1Channel::<EnforcingSigner>::new(&&fee_est, &&keys_provider, &&keys_provider, inbound_node_id, &channelmanager::provided_channel_type_features(&inbound_node_config), &channelmanager::provided_init_features(&outbound_node_config), &chan_open_channel_msg, 7, &inbound_node_config, 0, &&logger, 42).unwrap();
 
                        let expected_inbound_selected_chan_reserve = cmp::max(MIN_THEIR_CHAN_RESERVE_SATOSHIS, (chan.context.channel_value_satoshis as f64 * inbound_selected_channel_reserve_perc) as u64);
 
@@ -7770,7 +7839,7 @@ mod tests {
                        assert_eq!(chan_inbound_node.context.counterparty_selected_channel_reserve_satoshis.unwrap(), expected_outbound_selected_chan_reserve);
                } else {
                        // Channel Negotiations failed
-                       let result = InboundV1Channel::<EnforcingSigner>::new_from_req(&&fee_est, &&keys_provider, &&keys_provider, inbound_node_id, &channelmanager::provided_channel_type_features(&inbound_node_config), &channelmanager::provided_init_features(&outbound_node_config), &chan_open_channel_msg, 7, &inbound_node_config, 0, &&logger, 42);
+                       let result = InboundV1Channel::<EnforcingSigner>::new(&&fee_est, &&keys_provider, &&keys_provider, inbound_node_id, &channelmanager::provided_channel_type_features(&inbound_node_config), &channelmanager::provided_init_features(&outbound_node_config), &chan_open_channel_msg, 7, &inbound_node_config, 0, &&logger, 42);
                        assert!(result.is_err());
                }
        }
@@ -7795,7 +7864,7 @@ mod tests {
                // Make sure A's dust limit is as we expect.
                let open_channel_msg = node_a_chan.get_open_channel(genesis_block(network).header.block_hash());
                let node_b_node_id = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&[7; 32]).unwrap());
-               let mut node_b_chan = InboundV1Channel::<EnforcingSigner>::new_from_req(&feeest, &&keys_provider, &&keys_provider, node_b_node_id, &channelmanager::provided_channel_type_features(&config), &channelmanager::provided_init_features(&config), &open_channel_msg, 7, &config, 0, &&logger, 42).unwrap();
+               let mut node_b_chan = InboundV1Channel::<EnforcingSigner>::new(&feeest, &&keys_provider, &&keys_provider, node_b_node_id, &channelmanager::provided_channel_type_features(&config), &channelmanager::provided_init_features(&config), &open_channel_msg, 7, &config, 0, &&logger, 42).unwrap();
 
                // Node B --> Node A: accept channel, explicitly setting B's dust limit.
                let mut accept_channel_msg = node_b_chan.accept_inbound_channel(0);
@@ -8079,6 +8148,7 @@ mod tests {
                                payment_hash: PaymentHash([0; 32]),
                                state: OutboundHTLCState::Committed,
                                source: HTLCSource::dummy(),
+                               skimmed_fee_msat: None,
                        };
                        out.payment_hash.0 = Sha256::hash(&hex::decode("0202020202020202020202020202020202020202020202020202020202020202").unwrap()).into_inner();
                        out
@@ -8091,6 +8161,7 @@ mod tests {
                                payment_hash: PaymentHash([0; 32]),
                                state: OutboundHTLCState::Committed,
                                source: HTLCSource::dummy(),
+                               skimmed_fee_msat: None,
                        };
                        out.payment_hash.0 = Sha256::hash(&hex::decode("0303030303030303030303030303030303030303030303030303030303030303").unwrap()).into_inner();
                        out
@@ -8492,6 +8563,7 @@ mod tests {
                                payment_hash: PaymentHash([0; 32]),
                                state: OutboundHTLCState::Committed,
                                source: HTLCSource::dummy(),
+                               skimmed_fee_msat: None,
                        };
                        out.payment_hash.0 = Sha256::hash(&hex::decode("0505050505050505050505050505050505050505050505050505050505050505").unwrap()).into_inner();
                        out
@@ -8504,6 +8576,7 @@ mod tests {
                                payment_hash: PaymentHash([0; 32]),
                                state: OutboundHTLCState::Committed,
                                source: HTLCSource::dummy(),
+                               skimmed_fee_msat: None,
                        };
                        out.payment_hash.0 = Sha256::hash(&hex::decode("0505050505050505050505050505050505050505050505050505050505050505").unwrap()).into_inner();
                        out
@@ -8617,7 +8690,7 @@ mod tests {
                let mut open_channel_msg = node_a_chan.get_open_channel(genesis_block(network).header.block_hash());
                open_channel_msg.channel_type = Some(channel_type_features);
                let node_b_node_id = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&[7; 32]).unwrap());
-               let res = InboundV1Channel::<EnforcingSigner>::new_from_req(&feeest, &&keys_provider, &&keys_provider,
+               let res = InboundV1Channel::<EnforcingSigner>::new(&feeest, &&keys_provider, &&keys_provider,
                        node_b_node_id, &channelmanager::provided_channel_type_features(&config),
                        &channelmanager::provided_init_features(&config), &open_channel_msg, 7, &config, 0, &&logger, 42);
                assert!(res.is_ok());
@@ -8659,7 +8732,7 @@ mod tests {
                ).unwrap();
 
                let open_channel_msg = channel_a.get_open_channel(genesis_block(network).header.block_hash());
-               let channel_b = InboundV1Channel::<EnforcingSigner>::new_from_req(
+               let channel_b = InboundV1Channel::<EnforcingSigner>::new(
                        &fee_estimator, &&keys_provider, &&keys_provider, node_id_a,
                        &channelmanager::provided_channel_type_features(&config), &channelmanager::provided_init_features(&config),
                        &open_channel_msg, 7, &config, 0, &&logger, 42
@@ -8702,7 +8775,7 @@ mod tests {
 
                // Since A supports both `static_remote_key` and `option_anchors`, but B only accepts
                // `static_remote_key`, it will fail the channel.
-               let channel_b = InboundV1Channel::<EnforcingSigner>::new_from_req(
+               let channel_b = InboundV1Channel::<EnforcingSigner>::new(
                        &fee_estimator, &&keys_provider, &&keys_provider, node_id_a,
                        &channelmanager::provided_channel_type_features(&config), &init_features_with_simple_anchors,
                        &open_channel_msg, 7, &config, 0, &&logger, 42
@@ -8746,7 +8819,7 @@ mod tests {
                let mut open_channel_msg = channel_a.get_open_channel(genesis_block(network).header.block_hash());
                open_channel_msg.channel_type = Some(simple_anchors_channel_type.clone());
 
-               let res = InboundV1Channel::<EnforcingSigner>::new_from_req(
+               let res = InboundV1Channel::<EnforcingSigner>::new(
                        &fee_estimator, &&keys_provider, &&keys_provider, node_id_a,
                        &channelmanager::provided_channel_type_features(&config), &simple_anchors_init,
                        &open_channel_msg, 7, &config, 0, &&logger, 42
@@ -8764,7 +8837,7 @@ mod tests {
 
                let open_channel_msg = channel_a.get_open_channel(genesis_block(network).header.block_hash());
 
-               let channel_b = InboundV1Channel::<EnforcingSigner>::new_from_req(
+               let channel_b = InboundV1Channel::<EnforcingSigner>::new(
                        &fee_estimator, &&keys_provider, &&keys_provider, node_id_a,
                        &channelmanager::provided_channel_type_features(&config), &channelmanager::provided_init_features(&config),
                        &open_channel_msg, 7, &config, 0, &&logger, 42