Automatically update fees on outbound channels as fees change
[rust-lightning] / lightning / src / ln / channelmanager.rs
index 24c0c688cf0843274a61954433098d31324810a5..389e67ddb9b1652c399b11c0640637eaaaa8ab04 100644 (file)
@@ -37,7 +37,7 @@ use bitcoin::secp256k1;
 
 use chain;
 use chain::{Confirm, Watch, BestBlock};
-use chain::chaininterface::{BroadcasterInterface, FeeEstimator};
+use chain::chaininterface::{BroadcasterInterface, ConfirmationTarget, FeeEstimator};
 use chain::channelmonitor::{ChannelMonitor, ChannelMonitorUpdate, ChannelMonitorUpdateStep, ChannelMonitorUpdateErr, HTLC_FAIL_BACK_BUFFER, CLTV_CLAIM_BUFFER, LATENCY_GRACE_PERIOD_BLOCKS, ANTI_REORG_DELAY, MonitorEvent, CLOSED_CHANNEL_UPDATE_ID};
 use chain::transaction::{OutPoint, TransactionData};
 // Since this struct is returned in `list_channels` methods, expose it here in case users want to
@@ -71,7 +71,6 @@ use core::time::Duration;
 #[cfg(any(test, feature = "allow_wallclock_use"))]
 use std::time::Instant;
 use core::ops::Deref;
-use bitcoin::hashes::hex::ToHex;
 
 // We hold various information about HTLC relay in the HTLC objects in Channel itself:
 //
@@ -491,6 +490,8 @@ pub struct ChannelManager<Signer: Sign, M: Deref, T: Deref, K: Deref, F: Deref,
        /// Because adding or removing an entry is rare, we usually take an outer read lock and then
        /// operate on the inner value freely. Sadly, this prevents parallel operation when opening a
        /// new channel.
+       ///
+       /// If also holding `channel_state` lock, must lock `channel_state` prior to `per_peer_state`.
        per_peer_state: RwLock<HashMap<PublicKey, Mutex<PeerState>>>,
 
        pending_events: Mutex<Vec<events::Event>>,
@@ -871,6 +872,18 @@ macro_rules! try_chan_entry {
        }
 }
 
+macro_rules! remove_channel {
+       ($channel_state: expr, $entry: expr) => {
+               {
+                       let channel = $entry.remove_entry().1;
+                       if let Some(short_id) = channel.get_short_channel_id() {
+                               $channel_state.short_to_id.remove(&short_id);
+                       }
+                       channel
+               }
+       }
+}
+
 macro_rules! handle_monitor_err {
        ($self: ident, $err: expr, $channel_state: expr, $entry: expr, $action_type: path, $resend_raa: expr, $resend_commitment: expr) => {
                handle_monitor_err!($self, $err, $channel_state, $entry, $action_type, $resend_raa, $resend_commitment, Vec::new(), Vec::new())
@@ -1165,8 +1178,18 @@ impl<Signer: Sign, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelMana
                        return Err(APIError::APIMisuseError { err: format!("Channel value must be at least 1000 satoshis. It was {}", channel_value_satoshis) });
                }
 
-               let config = if override_config.is_some() { override_config.as_ref().unwrap() } else { &self.default_configuration };
-               let channel = Channel::new_outbound(&self.fee_estimator, &self.keys_manager, their_network_key, channel_value_satoshis, push_msat, user_id, config)?;
+               let channel = {
+                       let per_peer_state = self.per_peer_state.read().unwrap();
+                       match per_peer_state.get(&their_network_key) {
+                               Some(peer_state) => {
+                                       let peer_state = peer_state.lock().unwrap();
+                                       let their_features = &peer_state.latest_features;
+                                       let config = if override_config.is_some() { override_config.as_ref().unwrap() } else { &self.default_configuration };
+                                       Channel::new_outbound(&self.fee_estimator, &self.keys_manager, their_network_key, their_features, channel_value_satoshis, push_msat, user_id, config)?
+                               },
+                               None => return Err(APIError::ChannelUnavailable { err: format!("Not connected to node: {}", their_network_key) }),
+                       }
+               };
                let res = channel.get_open_channel(self.genesis_hash.clone());
 
                let _persistence_guard = PersistenceNotifierGuard::notify_on_drop(&self.total_consistency_lock, &self.persistence_notifier);
@@ -1260,40 +1283,61 @@ impl<Signer: Sign, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelMana
        pub fn close_channel(&self, channel_id: &[u8; 32]) -> Result<(), APIError> {
                let _persistence_guard = PersistenceNotifierGuard::notify_on_drop(&self.total_consistency_lock, &self.persistence_notifier);
 
-               let (mut failed_htlcs, chan_option) = {
+               let counterparty_node_id;
+               let mut failed_htlcs: Vec<(HTLCSource, PaymentHash)>;
+               let result: Result<(), _> = loop {
                        let mut channel_state_lock = self.channel_state.lock().unwrap();
                        let channel_state = &mut *channel_state_lock;
                        match channel_state.by_id.entry(channel_id.clone()) {
                                hash_map::Entry::Occupied(mut chan_entry) => {
-                                       let (shutdown_msg, failed_htlcs) = chan_entry.get_mut().get_shutdown()?;
+                                       counterparty_node_id = chan_entry.get().get_counterparty_node_id();
+                                       let per_peer_state = self.per_peer_state.read().unwrap();
+                                       let (shutdown_msg, monitor_update, htlcs) = match per_peer_state.get(&counterparty_node_id) {
+                                               Some(peer_state) => {
+                                                       let peer_state = peer_state.lock().unwrap();
+                                                       let their_features = &peer_state.latest_features;
+                                                       chan_entry.get_mut().get_shutdown(&self.keys_manager, their_features)?
+                                               },
+                                               None => return Err(APIError::ChannelUnavailable { err: format!("Not connected to node: {}", counterparty_node_id) }),
+                                       };
+                                       failed_htlcs = htlcs;
+
+                                       // Update the monitor with the shutdown script if necessary.
+                                       if let Some(monitor_update) = monitor_update {
+                                               if let Err(e) = self.chain_monitor.update_channel(chan_entry.get().get_funding_txo().unwrap(), monitor_update) {
+                                                       let (result, is_permanent) =
+                                                               handle_monitor_err!(self, e, channel_state.short_to_id, chan_entry.get_mut(), RAACommitmentOrder::CommitmentFirst, false, false, Vec::new(), Vec::new(), chan_entry.key());
+                                                       if is_permanent {
+                                                               remove_channel!(channel_state, chan_entry);
+                                                               break result;
+                                                       }
+                                               }
+                                       }
+
                                        channel_state.pending_msg_events.push(events::MessageSendEvent::SendShutdown {
-                                               node_id: chan_entry.get().get_counterparty_node_id(),
+                                               node_id: counterparty_node_id,
                                                msg: shutdown_msg
                                        });
+
                                        if chan_entry.get().is_shutdown() {
-                                               if let Some(short_id) = chan_entry.get().get_short_channel_id() {
-                                                       channel_state.short_to_id.remove(&short_id);
+                                               let channel = remove_channel!(channel_state, chan_entry);
+                                               if let Ok(channel_update) = self.get_channel_update_for_broadcast(&channel) {
+                                                       channel_state.pending_msg_events.push(events::MessageSendEvent::BroadcastChannelUpdate {
+                                                               msg: channel_update
+                                                       });
                                                }
-                                               (failed_htlcs, Some(chan_entry.remove_entry().1))
-                                       } else { (failed_htlcs, None) }
+                                       }
+                                       break Ok(());
                                },
                                hash_map::Entry::Vacant(_) => return Err(APIError::ChannelUnavailable{err: "No such channel".to_owned()})
                        }
                };
+
                for htlc_source in failed_htlcs.drain(..) {
                        self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), htlc_source.0, &htlc_source.1, HTLCFailReason::Reason { failure_code: 0x4000 | 8, data: Vec::new() });
                }
-               let chan_update = if let Some(chan) = chan_option {
-                       self.get_channel_update_for_broadcast(&chan).ok()
-               } else { None };
-
-               if let Some(update) = chan_update {
-                       let mut channel_state = self.channel_state.lock().unwrap();
-                       channel_state.pending_msg_events.push(events::MessageSendEvent::BroadcastChannelUpdate {
-                               msg: update
-                       });
-               }
 
+               let _ = handle_error!(self, result, counterparty_node_id);
                Ok(())
        }
 
@@ -1858,6 +1902,9 @@ impl<Signer: Sign, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelMana
                        // for now more than 10 paths likely carries too much one-path failure.
                        return Err(PaymentSendFailure::ParameterError(APIError::RouteError{err: "Sending over more than 10 paths is not currently supported"}));
                }
+               if payment_secret.is_none() && route.paths.len() > 1 {
+                       return Err(PaymentSendFailure::ParameterError(APIError::APIMisuseError{err: "Payment secret is required for multi-path payments".to_string()}));
+               }
                let mut total_value = 0;
                let our_node_id = self.get_our_node_id();
                let mut path_errs = Vec::with_capacity(route.paths.len());
@@ -1912,9 +1959,13 @@ impl<Signer: Sign, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelMana
        /// would be able to guess -- otherwise, an intermediate node may claim the payment and it will
        /// never reach the recipient.
        ///
+       /// See [`send_payment`] documentation for more details on the return value of this function.
+       ///
        /// Similar to regular payments, you MUST NOT reuse a `payment_preimage` value. See
        /// [`send_payment`] for more information about the risks of duplicate preimage usage.
        ///
+       /// Note that `route` must have exactly one path.
+       ///
        /// [`send_payment`]: Self::send_payment
        pub fn send_spontaneous_payment(&self, route: &Route, payment_preimage: Option<PaymentPreimage>) -> Result<PaymentHash, PaymentSendFailure> {
                let preimage = match payment_preimage {
@@ -2509,46 +2560,120 @@ impl<Signer: Sign, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelMana
                self.process_background_events();
        }
 
-       /// If a peer is disconnected we mark any channels with that peer as 'disabled'.
-       /// After some time, if channels are still disabled we need to broadcast a ChannelUpdate
-       /// to inform the network about the uselessness of these channels.
+       fn update_channel_fee(&self, short_to_id: &mut HashMap<u64, [u8; 32]>, pending_msg_events: &mut Vec<events::MessageSendEvent>, chan_id: &[u8; 32], chan: &mut Channel<Signer>, new_feerate: u32) -> (bool, NotifyOption, Result<(), MsgHandleErrInternal>) {
+               if !chan.is_outbound() { return (true, NotifyOption::SkipPersist, Ok(())); }
+               // If the feerate has decreased by less than half, don't bother
+               if new_feerate <= chan.get_feerate() && new_feerate * 2 > chan.get_feerate() {
+                       log_trace!(self.logger, "Channel {} does not qualify for a feerate change from {} to {}.",
+                               log_bytes!(chan_id[..]), chan.get_feerate(), new_feerate);
+                       return (true, NotifyOption::SkipPersist, Ok(()));
+               }
+               if !chan.is_live() {
+                       log_trace!(self.logger, "Channel {} does not qualify for a feerate change from {} to {} as it cannot currently be updated (probably the peer is disconnected).",
+                               log_bytes!(chan_id[..]), chan.get_feerate(), new_feerate);
+                       return (true, NotifyOption::SkipPersist, Ok(()));
+               }
+               log_trace!(self.logger, "Channel {} qualifies for a feerate change from {} to {}.",
+                       log_bytes!(chan_id[..]), chan.get_feerate(), new_feerate);
+
+               let mut retain_channel = true;
+               let res = match chan.send_update_fee_and_commit(new_feerate, &self.logger) {
+                       Ok(res) => Ok(res),
+                       Err(e) => {
+                               let (drop, res) = convert_chan_err!(self, e, short_to_id, chan, chan_id);
+                               if drop { retain_channel = false; }
+                               Err(res)
+                       }
+               };
+               let ret_err = match res {
+                       Ok(Some((update_fee, commitment_signed, monitor_update))) => {
+                               if let Err(e) = self.chain_monitor.update_channel(chan.get_funding_txo().unwrap(), monitor_update) {
+                                       let (res, drop) = handle_monitor_err!(self, e, short_to_id, chan, RAACommitmentOrder::CommitmentFirst, false, true, Vec::new(), Vec::new(), chan_id);
+                                       if drop { retain_channel = false; }
+                                       res
+                               } else {
+                                       pending_msg_events.push(events::MessageSendEvent::UpdateHTLCs {
+                                               node_id: chan.get_counterparty_node_id(),
+                                               updates: msgs::CommitmentUpdate {
+                                                       update_add_htlcs: Vec::new(),
+                                                       update_fulfill_htlcs: Vec::new(),
+                                                       update_fail_htlcs: Vec::new(),
+                                                       update_fail_malformed_htlcs: Vec::new(),
+                                                       update_fee: Some(update_fee),
+                                                       commitment_signed,
+                                               },
+                                       });
+                                       Ok(())
+                               }
+                       },
+                       Ok(None) => Ok(()),
+                       Err(e) => Err(e),
+               };
+               (retain_channel, NotifyOption::DoPersist, ret_err)
+       }
+
+       /// Performs actions which should happen on startup and roughly once per minute thereafter.
        ///
-       /// This method handles all the details, and must be called roughly once per minute.
+       /// This currently includes:
+       ///  * Increasing or decreasing the on-chain feerate estimates for our outbound channels,
+       ///  * Broadcasting `ChannelUpdate` messages if we've been disconnected from our peer for more
+       ///    than a minute, informing the network that they should no longer attempt to route over
+       ///    the channel.
        ///
-       /// Note that in some rare cases this may generate a `chain::Watch::update_channel` call.
+       /// Note that this may cause reentrancy through `chain::Watch::update_channel` calls or feerate
+       /// estimate fetches.
        pub fn timer_tick_occurred(&self) {
                PersistenceNotifierGuard::optionally_notify(&self.total_consistency_lock, &self.persistence_notifier, || {
                        let mut should_persist = NotifyOption::SkipPersist;
                        if self.process_background_events() { should_persist = NotifyOption::DoPersist; }
 
-                       let mut channel_state_lock = self.channel_state.lock().unwrap();
-                       let channel_state = &mut *channel_state_lock;
-                       for (_, chan) in channel_state.by_id.iter_mut() {
-                               match chan.channel_update_status() {
-                                       ChannelUpdateStatus::Enabled if !chan.is_live() => chan.set_channel_update_status(ChannelUpdateStatus::DisabledStaged),
-                                       ChannelUpdateStatus::Disabled if chan.is_live() => chan.set_channel_update_status(ChannelUpdateStatus::EnabledStaged),
-                                       ChannelUpdateStatus::DisabledStaged if chan.is_live() => chan.set_channel_update_status(ChannelUpdateStatus::Enabled),
-                                       ChannelUpdateStatus::EnabledStaged if !chan.is_live() => chan.set_channel_update_status(ChannelUpdateStatus::Disabled),
-                                       ChannelUpdateStatus::DisabledStaged if !chan.is_live() => {
-                                               if let Ok(update) = self.get_channel_update_for_broadcast(&chan) {
-                                                       channel_state.pending_msg_events.push(events::MessageSendEvent::BroadcastChannelUpdate {
-                                                               msg: update
-                                                       });
-                                               }
-                                               should_persist = NotifyOption::DoPersist;
-                                               chan.set_channel_update_status(ChannelUpdateStatus::Disabled);
-                                       },
-                                       ChannelUpdateStatus::EnabledStaged if chan.is_live() => {
-                                               if let Ok(update) = self.get_channel_update_for_broadcast(&chan) {
-                                                       channel_state.pending_msg_events.push(events::MessageSendEvent::BroadcastChannelUpdate {
-                                                               msg: update
-                                                       });
-                                               }
-                                               should_persist = NotifyOption::DoPersist;
-                                               chan.set_channel_update_status(ChannelUpdateStatus::Enabled);
-                                       },
-                                       _ => {},
-                               }
+                       let new_feerate = self.fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Normal);
+
+                       let mut handle_errors = Vec::new();
+                       {
+                               let mut channel_state_lock = self.channel_state.lock().unwrap();
+                               let channel_state = &mut *channel_state_lock;
+                               let pending_msg_events = &mut channel_state.pending_msg_events;
+                               let short_to_id = &mut channel_state.short_to_id;
+                               channel_state.by_id.retain(|chan_id, chan| {
+                                       match chan.channel_update_status() {
+                                               ChannelUpdateStatus::Enabled if !chan.is_live() => chan.set_channel_update_status(ChannelUpdateStatus::DisabledStaged),
+                                               ChannelUpdateStatus::Disabled if chan.is_live() => chan.set_channel_update_status(ChannelUpdateStatus::EnabledStaged),
+                                               ChannelUpdateStatus::DisabledStaged if chan.is_live() => chan.set_channel_update_status(ChannelUpdateStatus::Enabled),
+                                               ChannelUpdateStatus::EnabledStaged if !chan.is_live() => chan.set_channel_update_status(ChannelUpdateStatus::Disabled),
+                                               ChannelUpdateStatus::DisabledStaged if !chan.is_live() => {
+                                                       if let Ok(update) = self.get_channel_update_for_broadcast(&chan) {
+                                                               pending_msg_events.push(events::MessageSendEvent::BroadcastChannelUpdate {
+                                                                       msg: update
+                                                               });
+                                                       }
+                                                       should_persist = NotifyOption::DoPersist;
+                                                       chan.set_channel_update_status(ChannelUpdateStatus::Disabled);
+                                               },
+                                               ChannelUpdateStatus::EnabledStaged if chan.is_live() => {
+                                                       if let Ok(update) = self.get_channel_update_for_broadcast(&chan) {
+                                                               pending_msg_events.push(events::MessageSendEvent::BroadcastChannelUpdate {
+                                                                       msg: update
+                                                               });
+                                                       }
+                                                       should_persist = NotifyOption::DoPersist;
+                                                       chan.set_channel_update_status(ChannelUpdateStatus::Enabled);
+                                               },
+                                               _ => {},
+                                       }
+
+                                       let counterparty_node_id = chan.get_counterparty_node_id();
+                                       let (retain_channel, chan_needs_persist, err) = self.update_channel_fee(short_to_id, pending_msg_events, chan_id, chan, new_feerate);
+                                       if chan_needs_persist == NotifyOption::DoPersist { should_persist = NotifyOption::DoPersist; }
+                                       if err.is_err() {
+                                               handle_errors.push((err, counterparty_node_id));
+                                       }
+                                       retain_channel
+                               });
+                       }
+
+                       for (err, counterparty_node_id) in handle_errors.drain(..) {
+                               let _ = handle_error!(self, err, counterparty_node_id);
                        }
 
                        should_persist
@@ -3027,7 +3152,7 @@ impl<Signer: Sign, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelMana
                        return Err(MsgHandleErrInternal::send_err_msg_no_close("Unknown genesis block hash".to_owned(), msg.temporary_channel_id.clone()));
                }
 
-               let channel = Channel::new_from_req(&self.fee_estimator, &self.keys_manager, counterparty_node_id.clone(), their_features, msg, 0, &self.default_configuration)
+               let channel = Channel::new_from_req(&self.fee_estimator, &self.keys_manager, counterparty_node_id.clone(), &their_features, msg, 0, &self.default_configuration)
                        .map_err(|e| MsgHandleErrInternal::from_chan_no_close(e, msg.temporary_channel_id))?;
                let mut channel_state_lock = self.channel_state.lock().unwrap();
                let channel_state = &mut *channel_state_lock;
@@ -3053,7 +3178,7 @@ impl<Signer: Sign, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelMana
                                        if chan.get().get_counterparty_node_id() != *counterparty_node_id {
                                                return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!".to_owned(), msg.temporary_channel_id));
                                        }
-                                       try_chan_entry!(self, chan.get_mut().accept_channel(&msg, &self.default_configuration, their_features), channel_state, chan);
+                                       try_chan_entry!(self, chan.get_mut().accept_channel(&msg, &self.default_configuration, &their_features), channel_state, chan);
                                        (chan.get().get_value_satoshis(), chan.get().get_funding_redeemscript().to_v0_p2wsh(), chan.get().get_user_id())
                                },
                                hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel".to_owned(), msg.temporary_channel_id))
@@ -3190,7 +3315,8 @@ impl<Signer: Sign, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelMana
        }
 
        fn internal_shutdown(&self, counterparty_node_id: &PublicKey, their_features: &InitFeatures, msg: &msgs::Shutdown) -> Result<(), MsgHandleErrInternal> {
-               let (mut dropped_htlcs, chan_option) = {
+               let mut dropped_htlcs: Vec<(HTLCSource, PaymentHash)>;
+               let result: Result<(), _> = loop {
                        let mut channel_state_lock = self.channel_state.lock().unwrap();
                        let channel_state = &mut *channel_state_lock;
 
@@ -3199,25 +3325,37 @@ impl<Signer: Sign, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelMana
                                        if chan_entry.get().get_counterparty_node_id() != *counterparty_node_id {
                                                return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!".to_owned(), msg.channel_id));
                                        }
-                                       let (shutdown, closing_signed, dropped_htlcs) = try_chan_entry!(self, chan_entry.get_mut().shutdown(&self.fee_estimator, &their_features, &msg), channel_state, chan_entry);
+
+                                       let (shutdown, closing_signed, monitor_update, htlcs) = try_chan_entry!(self, chan_entry.get_mut().shutdown(&self.fee_estimator, &self.keys_manager, &their_features, &msg), channel_state, chan_entry);
+                                       dropped_htlcs = htlcs;
+
+                                       // Update the monitor with the shutdown script if necessary.
+                                       if let Some(monitor_update) = monitor_update {
+                                               if let Err(e) = self.chain_monitor.update_channel(chan_entry.get().get_funding_txo().unwrap(), monitor_update) {
+                                                       let (result, is_permanent) =
+                                                               handle_monitor_err!(self, e, channel_state.short_to_id, chan_entry.get_mut(), RAACommitmentOrder::CommitmentFirst, false, false, Vec::new(), Vec::new(), chan_entry.key());
+                                                       if is_permanent {
+                                                               remove_channel!(channel_state, chan_entry);
+                                                               break result;
+                                                       }
+                                               }
+                                       }
+
                                        if let Some(msg) = shutdown {
                                                channel_state.pending_msg_events.push(events::MessageSendEvent::SendShutdown {
-                                                       node_id: counterparty_node_id.clone(),
+                                                       node_id: *counterparty_node_id,
                                                        msg,
                                                });
                                        }
                                        if let Some(msg) = closing_signed {
+                                               // TODO: Do not send this if the monitor update failed.
                                                channel_state.pending_msg_events.push(events::MessageSendEvent::SendClosingSigned {
-                                                       node_id: counterparty_node_id.clone(),
+                                                       node_id: *counterparty_node_id,
                                                        msg,
                                                });
                                        }
-                                       if chan_entry.get().is_shutdown() {
-                                               if let Some(short_id) = chan_entry.get().get_short_channel_id() {
-                                                       channel_state.short_to_id.remove(&short_id);
-                                               }
-                                               (dropped_htlcs, Some(chan_entry.remove_entry().1))
-                                       } else { (dropped_htlcs, None) }
+
+                                       break Ok(());
                                },
                                hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel".to_owned(), msg.channel_id))
                        }
@@ -3225,14 +3363,8 @@ impl<Signer: Sign, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelMana
                for htlc_source in dropped_htlcs.drain(..) {
                        self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), htlc_source.0, &htlc_source.1, HTLCFailReason::Reason { failure_code: 0x4000 | 8, data: Vec::new() });
                }
-               if let Some(chan) = chan_option {
-                       if let Ok(update) = self.get_channel_update_for_broadcast(&chan) {
-                               let mut channel_state = self.channel_state.lock().unwrap();
-                               channel_state.pending_msg_events.push(events::MessageSendEvent::BroadcastChannelUpdate {
-                                       msg: update
-                               });
-                       }
-               }
+
+               let _ = handle_error!(self, result, *counterparty_node_id);
                Ok(())
        }
 
@@ -3669,62 +3801,6 @@ impl<Signer: Sign, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelMana
                Ok(())
        }
 
-       /// Begin Update fee process. Allowed only on an outbound channel.
-       /// If successful, will generate a UpdateHTLCs event, so you should probably poll
-       /// PeerManager::process_events afterwards.
-       /// Note: This API is likely to change!
-       /// (C-not exported) Cause its doc(hidden) anyway
-       #[doc(hidden)]
-       pub fn update_fee(&self, channel_id: [u8;32], feerate_per_kw: u32) -> Result<(), APIError> {
-               let _persistence_guard = PersistenceNotifierGuard::notify_on_drop(&self.total_consistency_lock, &self.persistence_notifier);
-               let counterparty_node_id;
-               let err: Result<(), _> = loop {
-                       let mut channel_state_lock = self.channel_state.lock().unwrap();
-                       let channel_state = &mut *channel_state_lock;
-
-                       match channel_state.by_id.entry(channel_id) {
-                               hash_map::Entry::Vacant(_) => return Err(APIError::APIMisuseError{err: format!("Failed to find corresponding channel for id {}", channel_id.to_hex())}),
-                               hash_map::Entry::Occupied(mut chan) => {
-                                       if !chan.get().is_outbound() {
-                                               return Err(APIError::APIMisuseError{err: "update_fee cannot be sent for an inbound channel".to_owned()});
-                                       }
-                                       if chan.get().is_awaiting_monitor_update() {
-                                               return Err(APIError::MonitorUpdateFailed);
-                                       }
-                                       if !chan.get().is_live() {
-                                               return Err(APIError::ChannelUnavailable{err: "Channel is either not yet fully established or peer is currently disconnected".to_owned()});
-                                       }
-                                       counterparty_node_id = chan.get().get_counterparty_node_id();
-                                       if let Some((update_fee, commitment_signed, monitor_update)) =
-                                                       break_chan_entry!(self, chan.get_mut().send_update_fee_and_commit(feerate_per_kw, &self.logger), channel_state, chan)
-                                       {
-                                               if let Err(_e) = self.chain_monitor.update_channel(chan.get().get_funding_txo().unwrap(), monitor_update) {
-                                                       unimplemented!();
-                                               }
-                                               log_debug!(self.logger, "Updating fee resulted in a commitment_signed for channel {}", log_bytes!(chan.get().channel_id()));
-                                               channel_state.pending_msg_events.push(events::MessageSendEvent::UpdateHTLCs {
-                                                       node_id: chan.get().get_counterparty_node_id(),
-                                                       updates: msgs::CommitmentUpdate {
-                                                               update_add_htlcs: Vec::new(),
-                                                               update_fulfill_htlcs: Vec::new(),
-                                                               update_fail_htlcs: Vec::new(),
-                                                               update_fail_malformed_htlcs: Vec::new(),
-                                                               update_fee: Some(update_fee),
-                                                               commitment_signed,
-                                                       },
-                                               });
-                                       }
-                               },
-                       }
-                       return Ok(())
-               };
-
-               match handle_error!(self, err, counterparty_node_id) {
-                       Ok(_) => unreachable!(),
-                       Err(e) => { Err(APIError::APIMisuseError { err: e.err })}
-               }
-       }
-
        /// Process pending events from the `chain::Watch`, returning whether any events were processed.
        fn process_pending_monitor_events(&self) -> bool {
                let mut failed_channels = Vec::new();
@@ -5160,11 +5236,13 @@ mod tests {
        use bitcoin::hashes::sha256::Hash as Sha256;
        use core::time::Duration;
        use ln::{PaymentPreimage, PaymentHash, PaymentSecret};
+       use ln::channelmanager::PaymentSendFailure;
        use ln::features::{InitFeatures, InvoiceFeatures};
        use ln::functional_test_utils::*;
        use ln::msgs;
        use ln::msgs::ChannelMessageHandler;
        use routing::router::{get_keysend_route, get_route};
+       use util::errors::APIError;
        use util::events::{Event, MessageSendEvent, MessageSendEventsProvider};
        use util::test_utils;
 
@@ -5552,6 +5630,39 @@ mod tests {
 
                nodes[1].logger.assert_log_contains("lightning::ln::channelmanager".to_string(), "We don't support MPP keysend payments".to_string(), 1);
        }
+
+       #[test]
+       fn test_multi_hop_missing_secret() {
+               let chanmon_cfgs = create_chanmon_cfgs(4);
+               let node_cfgs = create_node_cfgs(4, &chanmon_cfgs);
+               let node_chanmgrs = create_node_chanmgrs(4, &node_cfgs, &[None, None, None, None]);
+               let nodes = create_network(4, &node_cfgs, &node_chanmgrs);
+
+               let chan_1_id = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known()).0.contents.short_channel_id;
+               let chan_2_id = create_announced_chan_between_nodes(&nodes, 0, 2, InitFeatures::known(), InitFeatures::known()).0.contents.short_channel_id;
+               let chan_3_id = create_announced_chan_between_nodes(&nodes, 1, 3, InitFeatures::known(), InitFeatures::known()).0.contents.short_channel_id;
+               let chan_4_id = create_announced_chan_between_nodes(&nodes, 2, 3, InitFeatures::known(), InitFeatures::known()).0.contents.short_channel_id;
+               let logger = test_utils::TestLogger::new();
+
+               // Marshall an MPP route.
+               let (_, payment_hash, _) = get_payment_preimage_hash!(&nodes[3]);
+               let net_graph_msg_handler = &nodes[0].net_graph_msg_handler;
+               let mut route = get_route(&nodes[0].node.get_our_node_id(), &net_graph_msg_handler.network_graph.read().unwrap(), &nodes[3].node.get_our_node_id(), Some(InvoiceFeatures::known()), None, &[], 100000, TEST_FINAL_CLTV, &logger).unwrap();
+               let path = route.paths[0].clone();
+               route.paths.push(path);
+               route.paths[0][0].pubkey = nodes[1].node.get_our_node_id();
+               route.paths[0][0].short_channel_id = chan_1_id;
+               route.paths[0][1].short_channel_id = chan_3_id;
+               route.paths[1][0].pubkey = nodes[2].node.get_our_node_id();
+               route.paths[1][0].short_channel_id = chan_2_id;
+               route.paths[1][1].short_channel_id = chan_4_id;
+
+               match nodes[0].node.send_payment(&route, payment_hash, &None).unwrap_err() {
+                       PaymentSendFailure::ParameterError(APIError::APIMisuseError { ref err }) => {
+                               assert!(regex::Regex::new(r"Payment secret is required for multi-path payments").unwrap().is_match(err))                        },
+                       _ => panic!("unexpected error")
+               }
+       }
 }
 
 #[cfg(all(any(test, feature = "_test_utils"), feature = "unstable"))]
@@ -5563,7 +5674,7 @@ pub mod bench {
        use ln::channelmanager::{BestBlock, ChainParameters, ChannelManager, PaymentHash, PaymentPreimage};
        use ln::features::{InitFeatures, InvoiceFeatures};
        use ln::functional_test_utils::*;
-       use ln::msgs::ChannelMessageHandler;
+       use ln::msgs::{ChannelMessageHandler, Init};
        use routing::network_graph::NetworkGraph;
        use routing::router::get_route;
        use util::test_utils;
@@ -5626,6 +5737,8 @@ pub mod bench {
                });
                let node_b_holder = NodeHolder { node: &node_b };
 
+               node_a.peer_connected(&node_b.get_our_node_id(), &Init { features: InitFeatures::known() });
+               node_b.peer_connected(&node_a.get_our_node_id(), &Init { features: InitFeatures::known() });
                node_a.create_channel(node_b.get_our_node_id(), 8_000_000, 100_000_000, 42, None).unwrap();
                node_b.handle_open_channel(&node_a.get_our_node_id(), InitFeatures::known(), &get_event_msg!(node_a_holder, MessageSendEvent::SendOpenChannel, node_b.get_our_node_id()));
                node_a.handle_accept_channel(&node_b.get_our_node_id(), InitFeatures::known(), &get_event_msg!(node_b_holder, MessageSendEvent::SendAcceptChannel, node_a.get_our_node_id()));