Expect `pending_msg_events` to be in random peer order in tests
[rust-lightning] / lightning / src / ln / channelmanager.rs
index 026f5a32bca41c6cc5759de7af60dec8b431f15a..108bc7063d3e25f24fca2b736bf2311d41d6988a 100644 (file)
@@ -46,7 +46,9 @@ use crate::ln::channel::{Channel, ChannelError, ChannelUpdateStatus, UpdateFulfi
 use crate::ln::features::{ChannelFeatures, ChannelTypeFeatures, InitFeatures, NodeFeatures};
 #[cfg(any(feature = "_test_utils", test))]
 use crate::ln::features::InvoiceFeatures;
-use crate::routing::router::{InFlightHtlcs, PaymentParameters, Route, RouteHop, RoutePath};
+use crate::routing::gossip::NetworkGraph;
+use crate::routing::router::{DefaultRouter, InFlightHtlcs, PaymentParameters, Route, RouteHop, RoutePath, Router};
+use crate::routing::scoring::ProbabilisticScorer;
 use crate::ln::msgs;
 use crate::ln::onion_utils;
 use crate::ln::onion_utils::HTLCFailReason;
@@ -291,10 +293,10 @@ struct ReceiveError {
 
 type ShutdownResult = (Option<(OutPoint, ChannelMonitorUpdate)>, Vec<(HTLCSource, PaymentHash, PublicKey, [u8; 32])>);
 
-/// Error type returned across the channel_state mutex boundary. When an Err is generated for a
+/// Error type returned across the peer_state mutex boundary. When an Err is generated for a
 /// Channel, we generally end up with a ChannelError::Close for which we have to close the channel
 /// immediately (ie with no further calls on it made). Thus, this step happens inside a
-/// channel_state lock. We then return the set of things that need to be done outside the lock in
+/// peer_state lock. We then return the set of things that need to be done outside the lock in
 /// this struct and call handle_error!() on it.
 
 struct MsgHandleErrInternal {
@@ -433,11 +435,7 @@ struct ClaimablePayments {
 }
 
 // Note this is only exposed in cfg(test):
-pub(super) struct ChannelHolder<Signer: Sign> {
-       pub(super) by_id: HashMap<[u8; 32], Channel<Signer>>,
-       /// Messages to send to peers - pushed to in the same lock that they are generated in (except
-       /// for broadcast messages, where ordering isn't as strict).
-       pub(super) pending_msg_events: Vec<MessageSendEvent>,
+pub(super) struct ChannelHolder {
 }
 
 /// Events which we process internally but cannot be procsesed immediately at the generation site
@@ -459,10 +457,19 @@ pub(crate) enum MonitorUpdateCompletionAction {
        EmitEvent { event: events::Event },
 }
 
-/// State we hold per-peer. In the future we should put channels in here, but for now we only hold
-/// the latest Init features we heard from the peer.
-struct PeerState {
+/// State we hold per-peer.
+pub(super) struct PeerState<Signer: Sign> {
+       /// `temporary_channel_id` or `channel_id` -> `channel`.
+       ///
+       /// Holds all channels where the peer is the counterparty. Once a channel has been assigned a
+       /// `channel_id`, the `temporary_channel_id` key in the map is updated and is replaced by the
+       /// `channel_id`.
+       pub(super) channel_by_id: HashMap<[u8; 32], Channel<Signer>>,
+       /// The latest `InitFeatures` we heard from the peer.
        latest_features: InitFeatures,
+       /// Messages to send to the peer - pushed to in the same lock that they are generated in (except
+       /// for broadcast messages, where ordering isn't as strict).
+       pub(super) pending_msg_events: Vec<MessageSendEvent>,
 }
 
 /// Stores a PaymentSecret and any other data we may need to validate an inbound payment is
@@ -490,24 +497,35 @@ struct PendingInboundPayment {
 /// when you're using lightning-net-tokio (since tokio::spawn requires parameters with static
 /// lifetimes). Other times you can afford a reference, which is more efficient, in which case
 /// SimpleRefChannelManager is the more appropriate type. Defining these type aliases prevents
-/// issues such as overly long function definitions. Note that the ChannelManager can take any
-/// type that implements KeysInterface for its keys manager, but this type alias chooses the
-/// concrete type of the KeysManager.
+/// issues such as overly long function definitions. Note that the ChannelManager can take any type
+/// that implements KeysInterface or Router for its keys manager and router, respectively, but this
+/// type alias chooses the concrete types of KeysManager and DefaultRouter.
 ///
 /// (C-not exported) as Arcs don't make sense in bindings
-pub type SimpleArcChannelManager<M, T, F, L> = ChannelManager<Arc<M>, Arc<T>, Arc<KeysManager>, Arc<F>, Arc<L>>;
+pub type SimpleArcChannelManager<M, T, F, L> = ChannelManager<
+       Arc<M>,
+       Arc<T>,
+       Arc<KeysManager>,
+       Arc<F>,
+       Arc<DefaultRouter<
+               Arc<NetworkGraph<Arc<L>>>,
+               Arc<L>,
+               Arc<Mutex<ProbabilisticScorer<Arc<NetworkGraph<Arc<L>>>, Arc<L>>>>
+       >>,
+       Arc<L>
+>;
 
 /// SimpleRefChannelManager is a type alias for a ChannelManager reference, and is the reference
 /// counterpart to the SimpleArcChannelManager type alias. Use this type by default when you don't
 /// need a ChannelManager with a static lifetime. You'll need a static lifetime in cases such as
 /// usage of lightning-net-tokio (since tokio::spawn requires parameters with static lifetimes).
 /// But if this is not necessary, using a reference is more efficient. Defining these type aliases
-/// helps with issues such as long function definitions. Note that the ChannelManager can take any
-/// type that implements KeysInterface for its keys manager, but this type alias chooses the
-/// concrete type of the KeysManager.
+/// issues such as overly long function definitions. Note that the ChannelManager can take any type
+/// that implements KeysInterface or Router for its keys manager and router, respectively, but this
+/// type alias chooses the concrete types of KeysManager and DefaultRouter.
 ///
 /// (C-not exported) as Arcs don't make sense in bindings
-pub type SimpleRefChannelManager<'a, 'b, 'c, 'd, 'e, M, T, F, L> = ChannelManager<&'a M, &'b T, &'c KeysManager, &'d F, &'e L>;
+pub type SimpleRefChannelManager<'a, 'b, 'c, 'd, 'e, 'f, 'g, 'h, M, T, F, L> = ChannelManager<&'a M, &'b T, &'c KeysManager, &'d F, &'e DefaultRouter<&'f NetworkGraph<&'g L>, &'g L, &'h Mutex<ProbabilisticScorer<&'f NetworkGraph<&'g L>, &'g L>>>, &'g L>;
 
 /// Manager which keeps track of a number of channels and sends messages to the appropriate
 /// channel, also tracking HTLC preimages and forwarding onion packets appropriately.
@@ -569,32 +587,38 @@ pub type SimpleRefChannelManager<'a, 'b, 'c, 'd, 'e, M, T, F, L> = ChannelManage
 //  |       |
 //  |       |__`channel_state`
 //  |           |
-//  |           |__`id_to_peer`
-//  |           |
-//  |           |__`short_to_chan_info`
-//  |           |
 //  |           |__`per_peer_state`
 //  |               |
-//  |               |__`outbound_scid_aliases`
-//  |               |
-//  |               |__`best_block`
-//  |               |
-//  |               |__`pending_events`
+//  |               |__`peer_state`
+//  |                   |
+//  |                   |__`id_to_peer`
+//  |                   |
+//  |                   |__`short_to_chan_info`
+//  |                   |
+//  |                   |__`outbound_scid_aliases`
 //  |                   |
-//  |                   |__`pending_background_events`
+//  |                   |__`best_block`
+//  |                   |
+//  |                   |__`pending_events`
+//  |                       |
+//  |                       |__`pending_background_events`
 //
-pub struct ChannelManager<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref>
-       where M::Target: chain::Watch<<K::Target as SignerProvider>::Signer>,
-        T::Target: BroadcasterInterface,
-        K::Target: KeysInterface,
-        F::Target: FeeEstimator,
-                               L::Target: Logger,
+pub struct ChannelManager<M: Deref, T: Deref, K: Deref, F: Deref, R: Deref, L: Deref>
+where
+       M::Target: chain::Watch<<K::Target as SignerProvider>::Signer>,
+       T::Target: BroadcasterInterface,
+       K::Target: KeysInterface,
+       F::Target: FeeEstimator,
+       R::Target: Router,
+       L::Target: Logger,
 {
        default_configuration: UserConfig,
        genesis_hash: BlockHash,
        fee_estimator: LowerBoundedFeeEstimator<F>,
        chain_monitor: M,
        tx_broadcaster: T,
+       #[allow(unused)]
+       router: R,
 
        /// See `ChannelManager` struct-level documentation for lock order requirements.
        #[cfg(test)]
@@ -605,9 +629,9 @@ pub struct ChannelManager<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref>
 
        /// See `ChannelManager` struct-level documentation for lock order requirements.
        #[cfg(any(test, feature = "_test_utils"))]
-       pub(super) channel_state: Mutex<ChannelHolder<<K::Target as SignerProvider>::Signer>>,
+       pub(super) channel_state: Mutex<ChannelHolder>,
        #[cfg(not(any(test, feature = "_test_utils")))]
-       channel_state: Mutex<ChannelHolder<<K::Target as SignerProvider>::Signer>>,
+       channel_state: Mutex<ChannelHolder>,
 
        /// Storage for PaymentSecrets and any requirements on future inbound payments before we will
        /// expose them to users via a PaymentClaimable event. HTLCs which do not meet the requirements
@@ -675,6 +699,9 @@ pub struct ChannelManager<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref>
        /// the corresponding channel for the event, as we only have access to the `channel_id` during
        /// the handling of the events.
        ///
+       /// Note that no consistency guarantees are made about the existence of a peer with the
+       /// `counterparty_node_id` in our other maps.
+       ///
        /// TODO:
        /// The `counterparty_node_id` isn't passed with `MonitorEvent`s currently. To pass it, we need
        /// to make `counterparty_node_id`'s a required field in `ChannelMonitor`s, which unfortunately
@@ -724,15 +751,24 @@ pub struct ChannelManager<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref>
        /// very far in the past, and can only ever be up to two hours in the future.
        highest_seen_timestamp: AtomicUsize,
 
-       /// The bulk of our storage will eventually be here (channels and message queues and the like).
+       /// The bulk of our storage will eventually be here (message queues and the like). Currently
+       /// the `per_peer_state` stores our channels on a per-peer basis, as well as the peer's latest
+       /// features.
+       ///
        /// If we are connected to a peer we always at least have an entry here, even if no channels
        /// are currently open with that peer.
+       ///
        /// 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.
+       /// operate on the inner value freely. This opens up for parallel per-peer operation for
+       /// channels.
+       ///
+       /// Note that the same thread must never acquire two inner `PeerState` locks at the same time.
        ///
        /// See `ChannelManager` struct-level documentation for lock order requirements.
-       per_peer_state: RwLock<HashMap<PublicKey, Mutex<PeerState>>>,
+       #[cfg(not(any(test, feature = "_test_utils")))]
+       per_peer_state: FairRwLock<HashMap<PublicKey, Mutex<PeerState<<K::Target as SignerProvider>::Signer>>>>,
+       #[cfg(any(test, feature = "_test_utils"))]
+       pub(super) per_peer_state: FairRwLock<HashMap<PublicKey, Mutex<PeerState<<K::Target as SignerProvider>::Signer>>>>,
 
        /// See `ChannelManager` struct-level documentation for lock order requirements.
        pending_events: Mutex<Vec<events::Event>>,
@@ -1129,6 +1165,7 @@ macro_rules! handle_error {
                                        // entering the macro.
                                        assert!($self.channel_state.try_lock().is_ok());
                                        assert!($self.pending_events.try_lock().is_ok());
+                                       assert!($self.per_peer_state.try_write().is_ok());
                                }
 
                                let mut msg_events = Vec::with_capacity(2);
@@ -1158,7 +1195,31 @@ macro_rules! handle_error {
                                }
 
                                if !msg_events.is_empty() {
-                                       $self.channel_state.lock().unwrap().pending_msg_events.append(&mut msg_events);
+                                       let per_peer_state = $self.per_peer_state.read().unwrap();
+                                       if let Some(peer_state_mutex) = per_peer_state.get(&$counterparty_node_id) {
+                                               let mut peer_state = peer_state_mutex.lock().unwrap();
+                                               peer_state.pending_msg_events.append(&mut msg_events);
+                                       }
+                                       #[cfg(debug_assertions)]
+                                       {
+                                               if let None = per_peer_state.get(&$counterparty_node_id) {
+                                                       // This shouldn't occour in tests unless an unkown counterparty_node_id
+                                                       // has been passed to our message handling functions.
+                                                       let expected_error_str = format!("Can't find a peer matching the passed counterparty node_id {}", $counterparty_node_id);
+                                                       match err.action {
+                                                               msgs::ErrorAction::SendErrorMessage {
+                                                                       msg: msgs::ErrorMessage { ref channel_id, ref data }
+                                                               }
+                                                               => {
+                                                                       assert_eq!(*data, expected_error_str);
+                                                                       if let Some((err_channel_id, _user_channel_id)) = chan_id {
+                                                                               assert_eq!(*channel_id, err_channel_id);
+                                                                       }
+                                                               }
+                                                               _ => panic!("Unexpected event"),
+                                                       }
+                                               }
+                                       }
                                }
 
                                // Return error in case higher-API need one
@@ -1358,12 +1419,14 @@ macro_rules! emit_channel_ready_event {
        }
 }
 
-impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F, L>
-       where M::Target: chain::Watch<<K::Target as SignerProvider>::Signer>,
-        T::Target: BroadcasterInterface,
-        K::Target: KeysInterface,
-        F::Target: FeeEstimator,
-        L::Target: Logger,
+impl<M: Deref, T: Deref, K: Deref, F: Deref, R: Deref, L: Deref> ChannelManager<M, T, K, F, R, L>
+where
+       M::Target: chain::Watch<<K::Target as SignerProvider>::Signer>,
+       T::Target: BroadcasterInterface,
+       K::Target: KeysInterface,
+       F::Target: FeeEstimator,
+       R::Target: Router,
+       L::Target: Logger,
 {
        /// Constructs a new ChannelManager to hold several channels and route between them.
        ///
@@ -1375,7 +1438,7 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
        /// Users need to notify the new ChannelManager when a new block is connected or
        /// disconnected using its `block_connected` and `block_disconnected` methods, starting
        /// from after `params.latest_hash`.
-       pub fn new(fee_est: F, chain_monitor: M, tx_broadcaster: T, logger: L, keys_manager: K, config: UserConfig, params: ChainParameters) -> Self {
+       pub fn new(fee_est: F, chain_monitor: M, tx_broadcaster: T, router: R, logger: L, keys_manager: K, config: UserConfig, params: ChainParameters) -> Self {
                let mut secp_ctx = Secp256k1::new();
                secp_ctx.seeded_randomize(&keys_manager.get_secure_random_bytes());
                let inbound_pmt_key_material = keys_manager.get_inbound_payment_key_material();
@@ -1386,12 +1449,11 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
                        fee_estimator: LowerBoundedFeeEstimator::new(fee_est),
                        chain_monitor,
                        tx_broadcaster,
+                       router,
 
                        best_block: RwLock::new(params.best_block),
 
                        channel_state: Mutex::new(ChannelHolder{
-                               by_id: HashMap::new(),
-                               pending_msg_events: Vec::new(),
                        }),
                        outbound_scid_aliases: Mutex::new(HashSet::new()),
                        pending_inbound_payments: Mutex::new(HashMap::new()),
@@ -1413,7 +1475,7 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
 
                        highest_seen_timestamp: AtomicUsize::new(0),
 
-                       per_peer_state: RwLock::new(HashMap::new()),
+                       per_peer_state: FairRwLock::new(HashMap::new()),
 
                        pending_events: Mutex::new(Vec::new()),
                        pending_background_events: Mutex::new(Vec::new()),
@@ -1480,37 +1542,38 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
                        return Err(APIError::APIMisuseError { err: format!("Channel value must be at least 1000 satoshis. It was {}", channel_value_satoshis) });
                }
 
+               let _persistence_guard = PersistenceNotifierGuard::notify_on_drop(&self.total_consistency_lock, &self.persistence_notifier);
+               // We want to make sure the lock is actually acquired by PersistenceNotifierGuard.
+               debug_assert!(&self.total_consistency_lock.try_write().is_err());
+
+               let mut channel_state = self.channel_state.lock().unwrap();
+               let per_peer_state = self.per_peer_state.read().unwrap();
+
+               let peer_state_mutex_opt = per_peer_state.get(&their_network_key);
+               if let None = peer_state_mutex_opt {
+                       return Err(APIError::APIMisuseError { err: format!("Not connected to node: {}", their_network_key) });
+               }
+
+               let mut peer_state = peer_state_mutex_opt.unwrap().lock().unwrap();
                let channel = {
-                       let per_peer_state = self.per_peer_state.read().unwrap();
-                       match per_peer_state.get(&their_network_key) {
-                               Some(peer_state) => {
-                                       let outbound_scid_alias = self.create_and_insert_outbound_scid_alias();
-                                       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 };
-                                       match Channel::new_outbound(&self.fee_estimator, &self.keys_manager, their_network_key,
-                                               their_features, channel_value_satoshis, push_msat, user_channel_id, config,
-                                               self.best_block.read().unwrap().height(), outbound_scid_alias)
-                                       {
-                                               Ok(res) => res,
-                                               Err(e) => {
-                                                       self.outbound_scid_aliases.lock().unwrap().remove(&outbound_scid_alias);
-                                                       return Err(e);
-                                               },
-                                       }
+                       let outbound_scid_alias = self.create_and_insert_outbound_scid_alias();
+                       let their_features = &peer_state.latest_features;
+                       let config = if override_config.is_some() { override_config.as_ref().unwrap() } else { &self.default_configuration };
+                       match Channel::new_outbound(&self.fee_estimator, &self.keys_manager, their_network_key,
+                               their_features, channel_value_satoshis, push_msat, user_channel_id, config,
+                               self.best_block.read().unwrap().height(), outbound_scid_alias)
+                       {
+                               Ok(res) => res,
+                               Err(e) => {
+                                       self.outbound_scid_aliases.lock().unwrap().remove(&outbound_scid_alias);
+                                       return Err(e);
                                },
-                               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);
-               // We want to make sure the lock is actually acquired by PersistenceNotifierGuard.
-               debug_assert!(&self.total_consistency_lock.try_write().is_err());
-
                let temporary_channel_id = channel.channel_id();
-               let mut channel_state = self.channel_state.lock().unwrap();
-               match channel_state.by_id.entry(temporary_channel_id) {
+               match peer_state.channel_by_id.entry(temporary_channel_id) {
                        hash_map::Entry::Occupied(_) => {
                                if cfg!(fuzzing) {
                                        return Err(APIError::APIMisuseError { err: "Fuzzy bad RNG".to_owned() });
@@ -1520,70 +1583,75 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
                        },
                        hash_map::Entry::Vacant(entry) => { entry.insert(channel); }
                }
-               channel_state.pending_msg_events.push(events::MessageSendEvent::SendOpenChannel {
+
+               peer_state.pending_msg_events.push(events::MessageSendEvent::SendOpenChannel {
                        node_id: their_network_key,
                        msg: res,
                });
                Ok(temporary_channel_id)
        }
 
-       fn list_channels_with_filter<Fn: FnMut(&(&[u8; 32], &Channel<<K::Target as SignerProvider>::Signer>)) -> bool>(&self, f: Fn) -> Vec<ChannelDetails> {
+       fn list_channels_with_filter<Fn: FnMut(&(&[u8; 32], &Channel<<K::Target as SignerProvider>::Signer>)) -> bool + Copy>(&self, f: Fn) -> Vec<ChannelDetails> {
                let mut res = Vec::new();
+               // Allocate our best estimate of the number of channels we have in the `res`
+               // Vec. Sadly the `short_to_chan_info` map doesn't cover channels without
+               // a scid or a scid alias, and the `id_to_peer` shouldn't be used outside
+               // of the ChannelMonitor handling. Therefore reallocations may still occur, but is
+               // unlikely as the `short_to_chan_info` map often contains 2 entries for
+               // the same channel.
+               res.reserve(self.short_to_chan_info.read().unwrap().len());
                {
-                       let channel_state = self.channel_state.lock().unwrap();
                        let best_block_height = self.best_block.read().unwrap().height();
-                       res.reserve(channel_state.by_id.len());
-                       for (channel_id, channel) in channel_state.by_id.iter().filter(f) {
-                               let balance = channel.get_available_balances();
-                               let (to_remote_reserve_satoshis, to_self_reserve_satoshis) =
-                                       channel.get_holder_counterparty_selected_channel_reserve_satoshis();
-                               res.push(ChannelDetails {
-                                       channel_id: (*channel_id).clone(),
-                                       counterparty: ChannelCounterparty {
-                                               node_id: channel.get_counterparty_node_id(),
-                                               features: InitFeatures::empty(),
-                                               unspendable_punishment_reserve: to_remote_reserve_satoshis,
-                                               forwarding_info: channel.counterparty_forwarding_info(),
-                                               // Ensures that we have actually received the `htlc_minimum_msat` value
-                                               // from the counterparty through the `OpenChannel` or `AcceptChannel`
-                                               // message (as they are always the first message from the counterparty).
-                                               // Else `Channel::get_counterparty_htlc_minimum_msat` could return the
-                                               // default `0` value set by `Channel::new_outbound`.
-                                               outbound_htlc_minimum_msat: if channel.have_received_message() {
-                                                       Some(channel.get_counterparty_htlc_minimum_msat()) } else { None },
-                                               outbound_htlc_maximum_msat: channel.get_counterparty_htlc_maximum_msat(),
-                                       },
-                                       funding_txo: channel.get_funding_txo(),
-                                       // Note that accept_channel (or open_channel) is always the first message, so
-                                       // `have_received_message` indicates that type negotiation has completed.
-                                       channel_type: if channel.have_received_message() { Some(channel.get_channel_type().clone()) } else { None },
-                                       short_channel_id: channel.get_short_channel_id(),
-                                       outbound_scid_alias: if channel.is_usable() { Some(channel.outbound_scid_alias()) } else { None },
-                                       inbound_scid_alias: channel.latest_inbound_scid_alias(),
-                                       channel_value_satoshis: channel.get_value_satoshis(),
-                                       unspendable_punishment_reserve: to_self_reserve_satoshis,
-                                       balance_msat: balance.balance_msat,
-                                       inbound_capacity_msat: balance.inbound_capacity_msat,
-                                       outbound_capacity_msat: balance.outbound_capacity_msat,
-                                       next_outbound_htlc_limit_msat: balance.next_outbound_htlc_limit_msat,
-                                       user_channel_id: channel.get_user_id(),
-                                       confirmations_required: channel.minimum_depth(),
-                                       confirmations: Some(channel.get_funding_tx_confirmations(best_block_height)),
-                                       force_close_spend_delay: channel.get_counterparty_selected_contest_delay(),
-                                       is_outbound: channel.is_outbound(),
-                                       is_channel_ready: channel.is_usable(),
-                                       is_usable: channel.is_live(),
-                                       is_public: channel.should_announce(),
-                                       inbound_htlc_minimum_msat: Some(channel.get_holder_htlc_minimum_msat()),
-                                       inbound_htlc_maximum_msat: channel.get_holder_htlc_maximum_msat(),
-                                       config: Some(channel.config()),
-                               });
-                       }
-               }
-               let per_peer_state = self.per_peer_state.read().unwrap();
-               for chan in res.iter_mut() {
-                       if let Some(peer_state) = per_peer_state.get(&chan.counterparty.node_id) {
-                               chan.counterparty.features = peer_state.lock().unwrap().latest_features.clone();
+                       let per_peer_state = self.per_peer_state.read().unwrap();
+                       for (_cp_id, peer_state_mutex) in per_peer_state.iter() {
+                               let mut peer_state_lock = peer_state_mutex.lock().unwrap();
+                               let peer_state = &mut *peer_state_lock;
+                               for (channel_id, channel) in peer_state.channel_by_id.iter().filter(f) {
+                                       let balance = channel.get_available_balances();
+                                       let (to_remote_reserve_satoshis, to_self_reserve_satoshis) =
+                                               channel.get_holder_counterparty_selected_channel_reserve_satoshis();
+                                       res.push(ChannelDetails {
+                                               channel_id: (*channel_id).clone(),
+                                               counterparty: ChannelCounterparty {
+                                                       node_id: channel.get_counterparty_node_id(),
+                                                       features: peer_state.latest_features.clone(),
+                                                       unspendable_punishment_reserve: to_remote_reserve_satoshis,
+                                                       forwarding_info: channel.counterparty_forwarding_info(),
+                                                       // Ensures that we have actually received the `htlc_minimum_msat` value
+                                                       // from the counterparty through the `OpenChannel` or `AcceptChannel`
+                                                       // message (as they are always the first message from the counterparty).
+                                                       // Else `Channel::get_counterparty_htlc_minimum_msat` could return the
+                                                       // default `0` value set by `Channel::new_outbound`.
+                                                       outbound_htlc_minimum_msat: if channel.have_received_message() {
+                                                               Some(channel.get_counterparty_htlc_minimum_msat()) } else { None },
+                                                       outbound_htlc_maximum_msat: channel.get_counterparty_htlc_maximum_msat(),
+                                               },
+                                               funding_txo: channel.get_funding_txo(),
+                                               // Note that accept_channel (or open_channel) is always the first message, so
+                                               // `have_received_message` indicates that type negotiation has completed.
+                                               channel_type: if channel.have_received_message() { Some(channel.get_channel_type().clone()) } else { None },
+                                               short_channel_id: channel.get_short_channel_id(),
+                                               outbound_scid_alias: if channel.is_usable() { Some(channel.outbound_scid_alias()) } else { None },
+                                               inbound_scid_alias: channel.latest_inbound_scid_alias(),
+                                               channel_value_satoshis: channel.get_value_satoshis(),
+                                               unspendable_punishment_reserve: to_self_reserve_satoshis,
+                                               balance_msat: balance.balance_msat,
+                                               inbound_capacity_msat: balance.inbound_capacity_msat,
+                                               outbound_capacity_msat: balance.outbound_capacity_msat,
+                                               next_outbound_htlc_limit_msat: balance.next_outbound_htlc_limit_msat,
+                                               user_channel_id: channel.get_user_id(),
+                                               confirmations_required: channel.minimum_depth(),
+                                               confirmations: Some(channel.get_funding_tx_confirmations(best_block_height)),
+                                               force_close_spend_delay: channel.get_counterparty_selected_contest_delay(),
+                                               is_outbound: channel.is_outbound(),
+                                               is_channel_ready: channel.is_usable(),
+                                               is_usable: channel.is_live(),
+                                               is_public: channel.should_announce(),
+                                               inbound_htlc_minimum_msat: Some(channel.get_holder_htlc_minimum_msat()),
+                                               inbound_htlc_maximum_msat: channel.get_holder_htlc_maximum_msat(),
+                                               config: Some(channel.config()),
+                                       });
+                               }
                        }
                }
                res
@@ -1633,22 +1701,18 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
                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()) {
+                       let per_peer_state = self.per_peer_state.read().unwrap();
+
+                       let peer_state_mutex_opt = per_peer_state.get(counterparty_node_id);
+                       if let None = peer_state_mutex_opt {
+                               return Err(APIError::APIMisuseError { err: format!("Can't find a peer matching the passed counterparty node_id {}", counterparty_node_id) });
+                       }
+
+                       let mut peer_state_lock = peer_state_mutex_opt.unwrap().lock().unwrap();
+                       let peer_state = &mut *peer_state_lock;
+                       match peer_state.channel_by_id.entry(channel_id.clone()) {
                                hash_map::Entry::Occupied(mut chan_entry) => {
-                                       if *counterparty_node_id != chan_entry.get().get_counterparty_node_id(){
-                                               return Err(APIError::APIMisuseError { err: "The passed counterparty_node_id doesn't match the channel's counterparty node_id".to_owned() });
-                                       }
-                                       let (shutdown_msg, monitor_update, htlcs) = {
-                                               let per_peer_state = self.per_peer_state.read().unwrap();
-                                               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, target_feerate_sats_per_1000_weight)?
-                                                       },
-                                                       None => return Err(APIError::ChannelUnavailable { err: format!("Not connected to node: {}", counterparty_node_id) }),
-                                               }
-                                       };
+                                       let (shutdown_msg, monitor_update, htlcs) = chan_entry.get_mut().get_shutdown(&self.keys_manager, &peer_state.latest_features, target_feerate_sats_per_1000_weight)?;
                                        failed_htlcs = htlcs;
 
                                        // Update the monitor with the shutdown script if necessary.
@@ -1662,7 +1726,7 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
                                                }
                                        }
 
-                                       channel_state.pending_msg_events.push(events::MessageSendEvent::SendShutdown {
+                                       peer_state.pending_msg_events.push(events::MessageSendEvent::SendShutdown {
                                                node_id: *counterparty_node_id,
                                                msg: shutdown_msg
                                        });
@@ -1670,7 +1734,7 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
                                        if chan_entry.get().is_shutdown() {
                                                let channel = remove_channel!(self, chan_entry);
                                                if let Ok(channel_update) = self.get_channel_update_for_broadcast(&channel) {
-                                                       channel_state.pending_msg_events.push(events::MessageSendEvent::BroadcastChannelUpdate {
+                                                       peer_state.pending_msg_events.push(events::MessageSendEvent::BroadcastChannelUpdate {
                                                                msg: channel_update
                                                        });
                                                }
@@ -1678,7 +1742,7 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
                                        }
                                        break Ok(());
                                },
-                               hash_map::Entry::Vacant(_) => return Err(APIError::ChannelUnavailable{err: "No such channel".to_owned()})
+                               hash_map::Entry::Vacant(_) => return Err(APIError::ChannelUnavailable{err: format!("Channel with id {} not found for the passed counterparty node_id {}", log_bytes!(*channel_id), counterparty_node_id) })
                        }
                };
 
@@ -1759,13 +1823,15 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
        /// user closes, which will be re-exposed as the `ChannelClosed` reason.
        fn force_close_channel_with_peer(&self, channel_id: &[u8; 32], peer_node_id: &PublicKey, peer_msg: Option<&String>, broadcast: bool)
        -> Result<PublicKey, APIError> {
+               let per_peer_state = self.per_peer_state.read().unwrap();
+               let peer_state_mutex_opt = per_peer_state.get(peer_node_id);
                let mut chan = {
-                       let mut channel_state_lock = self.channel_state.lock().unwrap();
-                       let channel_state = &mut *channel_state_lock;
-                       if let hash_map::Entry::Occupied(chan) = channel_state.by_id.entry(channel_id.clone()) {
-                               if chan.get().get_counterparty_node_id() != *peer_node_id {
-                                       return Err(APIError::ChannelUnavailable{err: "No such channel".to_owned()});
-                               }
+                       if let None = peer_state_mutex_opt {
+                               return Err(APIError::APIMisuseError{ err: format!("Can't find a peer matching the passed counterparty node_id {}", peer_node_id) });
+                       }
+                       let mut peer_state_lock = peer_state_mutex_opt.unwrap().lock().unwrap();
+                       let peer_state = &mut *peer_state_lock;
+                       if let hash_map::Entry::Occupied(chan) = peer_state.channel_by_id.entry(channel_id.clone()) {
                                if let Some(peer_msg) = peer_msg {
                                        self.issue_channel_close_events(chan.get(),ClosureReason::CounterpartyForceClosed { peer_msg: peer_msg.to_string() });
                                } else {
@@ -1773,14 +1839,14 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
                                }
                                remove_channel!(self, chan)
                        } else {
-                               return Err(APIError::ChannelUnavailable{err: "No such channel".to_owned()});
+                               return Err(APIError::ChannelUnavailable{ err: format!("Channel with id {} not found for the passed counterparty node_id {}", log_bytes!(*channel_id), peer_node_id) });
                        }
                };
                log_error!(self.logger, "Force-closing channel {}", log_bytes!(channel_id[..]));
                self.finish_force_close_channel(chan.force_shutdown(broadcast));
                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 {
+                       let mut peer_state = peer_state_mutex_opt.unwrap().lock().unwrap();
+                       peer_state.pending_msg_events.push(events::MessageSendEvent::BroadcastChannelUpdate {
                                msg: update
                        });
                }
@@ -1792,14 +1858,18 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
                let _persistence_guard = PersistenceNotifierGuard::notify_on_drop(&self.total_consistency_lock, &self.persistence_notifier);
                match self.force_close_channel_with_peer(channel_id, counterparty_node_id, None, broadcast) {
                        Ok(counterparty_node_id) => {
-                               self.channel_state.lock().unwrap().pending_msg_events.push(
-                                       events::MessageSendEvent::HandleError {
-                                               node_id: counterparty_node_id,
-                                               action: msgs::ErrorAction::SendErrorMessage {
-                                                       msg: msgs::ErrorMessage { channel_id: *channel_id, data: "Channel force-closed".to_owned() }
-                                               },
-                                       }
-                               );
+                               let per_peer_state = self.per_peer_state.read().unwrap();
+                               if let Some(peer_state_mutex) = per_peer_state.get(&counterparty_node_id) {
+                                       let mut peer_state = peer_state_mutex.lock().unwrap();
+                                       peer_state.pending_msg_events.push(
+                                               events::MessageSendEvent::HandleError {
+                                                       node_id: counterparty_node_id,
+                                                       action: msgs::ErrorAction::SendErrorMessage {
+                                                               msg: msgs::ErrorMessage { channel_id: *channel_id, data: "Channel force-closed".to_owned() }
+                                                       },
+                                               }
+                                       );
+                               }
                                Ok(())
                        },
                        Err(e) => Err(e)
@@ -2041,8 +2111,7 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
                        if let &PendingHTLCRouting::Forward { ref short_channel_id, .. } = routing {
                                if let Some((err, mut code, chan_update)) = loop {
                                        let id_option = self.short_to_chan_info.read().unwrap().get(&short_channel_id).cloned();
-                                       let mut channel_state = self.channel_state.lock().unwrap();
-                                       let forwarding_id_opt = match id_option {
+                                       let forwarding_chan_info_opt = match id_option {
                                                None => { // unknown_next_peer
                                                        // Note that this is likely a timing oracle for detecting whether an scid is a
                                                        // phantom or an intercept.
@@ -2055,13 +2124,20 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
                                                                break Some(("Don't have available channel for forwarding as requested.", 0x4000 | 10, None));
                                                        }
                                                },
-                                               Some((_cp_id, chan_id)) => Some(chan_id.clone()),
+                                               Some((cp_id, id)) => Some((cp_id.clone(), id.clone())),
                                        };
-                                       let chan_update_opt = if let Some(forwarding_id) = forwarding_id_opt {
-                                               let chan = match channel_state.by_id.get_mut(&forwarding_id) {
+                                       let chan_update_opt = if let Some((counterparty_node_id, forwarding_id)) = forwarding_chan_info_opt {
+                                               let per_peer_state = self.per_peer_state.read().unwrap();
+                                               let peer_state_mutex_opt = per_peer_state.get(&counterparty_node_id);
+                                               if let None = peer_state_mutex_opt {
+                                                       break Some(("Don't have available channel for forwarding as requested.", 0x4000 | 10, None));
+                                               }
+                                               let mut peer_state_lock = peer_state_mutex_opt.unwrap().lock().unwrap();
+                                               let peer_state = &mut *peer_state_lock;
+                                               let chan = match peer_state.channel_by_id.get_mut(&forwarding_id) {
                                                        None => {
-                                                               // Channel was removed. The short_to_chan_info and by_id maps have
-                                                               // no consistency guarantees.
+                                                               // Channel was removed. The short_to_chan_info and channel_by_id maps
+                                                               // have no consistency guarantees.
                                                                break Some(("Don't have available channel for forwarding as requested.", 0x4000 | 10, None));
                                                        },
                                                        Some(chan) => chan
@@ -2167,7 +2243,7 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
        /// public, and thus should be called whenever the result is going to be passed out in a
        /// [`MessageSendEvent::BroadcastChannelUpdate`] event.
        ///
-       /// May be called with channel_state already locked!
+       /// May be called with peer_state already locked!
        fn get_channel_update_for_broadcast(&self, chan: &Channel<<K::Target as SignerProvider>::Signer>) -> Result<msgs::ChannelUpdate, LightningError> {
                if !chan.should_announce() {
                        return Err(LightningError {
@@ -2186,7 +2262,7 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
        /// is public (only returning an Err if the channel does not yet have an assigned short_id),
        /// and thus MUST NOT be called unless the recipient of the resulting message has already
        /// provided evidence that they know about the existence of the channel.
-       /// May be called with channel_state already locked!
+       /// May be called with peer_state already locked!
        fn get_channel_update_for_unicast(&self, chan: &Channel<<K::Target as SignerProvider>::Signer>) -> Result<msgs::ChannelUpdate, LightningError> {
                log_trace!(self.logger, "Attempting to generate channel update for channel {}", log_bytes!(chan.channel_id()));
                let short_channel_id = match chan.get_short_channel_id().or(chan.latest_inbound_scid_alias()) {
@@ -2239,18 +2315,22 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
                let _persistence_guard = PersistenceNotifierGuard::notify_on_drop(&self.total_consistency_lock, &self.persistence_notifier);
 
                let err: Result<(), _> = loop {
-                       let id = match self.short_to_chan_info.read().unwrap().get(&path.first().unwrap().short_channel_id) {
+                       let (counterparty_node_id, id) = match self.short_to_chan_info.read().unwrap().get(&path.first().unwrap().short_channel_id) {
                                None => return Err(APIError::ChannelUnavailable{err: "No channel available with first hop!".to_owned()}),
-                               Some((_cp_id, chan_id)) => chan_id.clone(),
+                               Some((cp_id, chan_id)) => (cp_id.clone(), chan_id.clone()),
                        };
 
                        let mut channel_lock = self.channel_state.lock().unwrap();
                        let channel_state = &mut *channel_lock;
-                       if let hash_map::Entry::Occupied(mut chan) = channel_state.by_id.entry(id) {
+                       let per_peer_state = self.per_peer_state.read().unwrap();
+                       let peer_state_mutex_opt = per_peer_state.get(&counterparty_node_id);
+                       if let None = peer_state_mutex_opt {
+                               return Err(APIError::InvalidRoute{err: "No peer matching the path's first hop found!" });
+                       }
+                       let mut peer_state_lock = peer_state_mutex_opt.unwrap().lock().unwrap();
+                       let peer_state = &mut *peer_state_lock;
+                       if let hash_map::Entry::Occupied(mut chan) = peer_state.channel_by_id.entry(id) {
                                match {
-                                       if chan.get().get_counterparty_node_id() != path.first().unwrap().pubkey {
-                                               return Err(APIError::InvalidRoute{err: "Node ID mismatch on first hop!"});
-                                       }
                                        if !chan.get().is_live() {
                                                return Err(APIError::ChannelUnavailable{err: "Peer for first hop currently disconnected/pending monitor update!".to_owned()});
                                        }
@@ -2287,7 +2367,7 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
                                                }
 
                                                log_debug!(self.logger, "Sending payment along path resulted in a commitment_signed for channel {}", log_bytes!(chan_id));
-                                               channel_state.pending_msg_events.push(events::MessageSendEvent::UpdateHTLCs {
+                                               peer_state.pending_msg_events.push(events::MessageSendEvent::UpdateHTLCs {
                                                        node_id: path.first().unwrap().pubkey,
                                                        updates: msgs::CommitmentUpdate {
                                                                update_add_htlcs: vec![update_add],
@@ -2303,7 +2383,8 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
                                }
                        } else {
                                // The channel was likely removed after we fetched the id from the
-                               // `short_to_chan_info` map, but before we successfully locked the `by_id` map.
+                               // `short_to_chan_info` map, but before we successfully locked the
+                               // `channel_by_id` map.
                                // This can occur as no consistency guarantees exists between the two maps.
                                return Err(APIError::ChannelUnavailable{err: "No channel available with first hop!".to_owned()});
                        }
@@ -2386,7 +2467,7 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
        #[cfg(test)]
        pub(crate) fn test_add_new_pending_payment(&self, payment_hash: PaymentHash, payment_secret: Option<PaymentSecret>, payment_id: PaymentId, route: &Route) -> Result<Vec<[u8; 32]>, PaymentSendFailure> {
                let best_block_height = self.best_block.read().unwrap().height();
-               self.pending_outbound_payments.add_new_pending_payment(payment_hash, payment_secret, payment_id, route, &self.keys_manager, best_block_height)
+               self.pending_outbound_payments.test_add_new_pending_payment(payment_hash, payment_secret, payment_id, route, &self.keys_manager, best_block_height)
        }
 
 
@@ -2476,20 +2557,31 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
        /// Handles the generation of a funding transaction, optionally (for tests) with a function
        /// which checks the correctness of the funding transaction given the associated channel.
        fn funding_transaction_generated_intern<FundingOutput: Fn(&Channel<<K::Target as SignerProvider>::Signer>, &Transaction) -> Result<OutPoint, APIError>>(
-               &self, temporary_channel_id: &[u8; 32], _counterparty_node_id: &PublicKey, funding_transaction: Transaction, find_funding_output: FundingOutput
+               &self, temporary_channel_id: &[u8; 32], counterparty_node_id: &PublicKey, funding_transaction: Transaction, find_funding_output: FundingOutput
        ) -> Result<(), APIError> {
+               let mut channel_state = self.channel_state.lock().unwrap();
+               let per_peer_state = self.per_peer_state.read().unwrap();
+               let peer_state_mutex_opt = per_peer_state.get(counterparty_node_id);
+               if let None = peer_state_mutex_opt {
+                       return Err(APIError::APIMisuseError { err: format!("Can't find a peer matching the passed counterparty node_id {}", counterparty_node_id) })
+               }
+
+               let mut peer_state_lock = peer_state_mutex_opt.unwrap().lock().unwrap();
+               let peer_state = &mut *peer_state_lock;
                let (chan, msg) = {
-                       let (res, chan) = match self.channel_state.lock().unwrap().by_id.remove(temporary_channel_id) {
-                               Some(mut chan) => {
-                                       let funding_txo = find_funding_output(&chan, &funding_transaction)?;
-
-                                       (chan.get_outbound_funding_created(funding_transaction, funding_txo, &self.logger)
-                                               .map_err(|e| if let ChannelError::Close(msg) = e {
-                                                       MsgHandleErrInternal::from_finish_shutdown(msg, chan.channel_id(), chan.get_user_id(), chan.force_shutdown(true), None)
-                                               } else { unreachable!(); })
-                                       , chan)
-                               },
-                               None => { return Err(APIError::ChannelUnavailable { err: "No such channel".to_owned() }) },
+                       let (res, chan) = {
+                               match peer_state.channel_by_id.remove(temporary_channel_id) {
+                                       Some(mut chan) => {
+                                               let funding_txo = find_funding_output(&chan, &funding_transaction)?;
+
+                                               (chan.get_outbound_funding_created(funding_transaction, funding_txo, &self.logger)
+                                                       .map_err(|e| if let ChannelError::Close(msg) = e {
+                                                               MsgHandleErrInternal::from_finish_shutdown(msg, chan.channel_id(), chan.get_user_id(), chan.force_shutdown(true), None)
+                                                       } else { unreachable!(); })
+                                               , chan)
+                                       },
+                                       None => { return Err(APIError::ChannelUnavailable { err: format!("Channel with id {} not found for the passed counterparty node_id {}", log_bytes!(*temporary_channel_id), counterparty_node_id) }) },
+                               }
                        };
                        match handle_error!(self, res, chan.get_counterparty_node_id()) {
                                Ok(funding_msg) => {
@@ -2501,12 +2593,12 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
                        }
                };
 
-               let mut channel_state = self.channel_state.lock().unwrap();
-               channel_state.pending_msg_events.push(events::MessageSendEvent::SendFundingCreated {
+               peer_state.pending_msg_events.push(events::MessageSendEvent::SendFundingCreated {
                        node_id: chan.get_counterparty_node_id(),
                        msg,
                });
-               match channel_state.by_id.entry(chan.channel_id()) {
+               mem::drop(channel_state);
+               match peer_state.channel_by_id.entry(chan.channel_id()) {
                        hash_map::Entry::Occupied(_) => {
                                panic!("Generated duplicate funding txid?");
                        },
@@ -2640,34 +2732,34 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
                let _persistence_guard = PersistenceNotifierGuard::notify_on_drop(
                        &self.total_consistency_lock, &self.persistence_notifier,
                );
-               {
-                       let mut channel_state_lock = self.channel_state.lock().unwrap();
-                       let channel_state = &mut *channel_state_lock;
-                       for channel_id in channel_ids {
-                               let channel_counterparty_node_id = channel_state.by_id.get(channel_id)
-                                       .ok_or(APIError::ChannelUnavailable {
-                                               err: format!("Channel with ID {} was not found", log_bytes!(*channel_id)),
-                                       })?
-                                       .get_counterparty_node_id();
-                               if channel_counterparty_node_id != *counterparty_node_id {
-                                       return Err(APIError::APIMisuseError {
-                                               err: "counterparty node id mismatch".to_owned(),
-                                       });
-                               }
+               let mut channel_state_lock = self.channel_state.lock().unwrap();
+               let channel_state = &mut *channel_state_lock;
+               let per_peer_state = self.per_peer_state.read().unwrap();
+               let peer_state_mutex_opt = per_peer_state.get(counterparty_node_id);
+               if let None = peer_state_mutex_opt {
+                       return Err(APIError::APIMisuseError{ err: format!("Can't find a peer matching the passed counterparty node_id {}", counterparty_node_id) });
+               }
+               let mut peer_state_lock = peer_state_mutex_opt.unwrap().lock().unwrap();
+               let peer_state = &mut *peer_state_lock;
+               for channel_id in channel_ids {
+                       if !peer_state.channel_by_id.contains_key(channel_id) {
+                               return Err(APIError::ChannelUnavailable {
+                                       err: format!("Channel with ID {} was not found for the passed counterparty_node_id {}", log_bytes!(*channel_id), counterparty_node_id),
+                               });
                        }
-                       for channel_id in channel_ids {
-                               let channel = channel_state.by_id.get_mut(channel_id).unwrap();
-                               if !channel.update_config(config) {
-                                       continue;
-                               }
-                               if let Ok(msg) = self.get_channel_update_for_broadcast(channel) {
-                                       channel_state.pending_msg_events.push(events::MessageSendEvent::BroadcastChannelUpdate { msg });
-                               } else if let Ok(msg) = self.get_channel_update_for_unicast(channel) {
-                                       channel_state.pending_msg_events.push(events::MessageSendEvent::SendChannelUpdate {
-                                               node_id: channel.get_counterparty_node_id(),
-                                               msg,
-                                       });
-                               }
+               }
+               for channel_id in channel_ids {
+                       let channel = peer_state.channel_by_id.get_mut(channel_id).unwrap();
+                       if !channel.update_config(config) {
+                               continue;
+                       }
+                       if let Ok(msg) = self.get_channel_update_for_broadcast(channel) {
+                               peer_state.pending_msg_events.push(events::MessageSendEvent::BroadcastChannelUpdate { msg });
+                       } else if let Ok(msg) = self.get_channel_update_for_unicast(channel) {
+                               peer_state.pending_msg_events.push(events::MessageSendEvent::SendChannelUpdate {
+                                       node_id: channel.get_counterparty_node_id(),
+                                       msg,
+                               });
                        }
                }
                Ok(())
@@ -2695,21 +2787,30 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
        /// [`HTLCIntercepted`]: events::Event::HTLCIntercepted
        // TODO: when we move to deciding the best outbound channel at forward time, only take
        // `next_node_id` and not `next_hop_channel_id`
-       pub fn forward_intercepted_htlc(&self, intercept_id: InterceptId, next_hop_channel_id: &[u8; 32], _next_node_id: PublicKey, amt_to_forward_msat: u64) -> Result<(), APIError> {
+       pub fn forward_intercepted_htlc(&self, intercept_id: InterceptId, next_hop_channel_id: &[u8; 32], next_node_id: PublicKey, amt_to_forward_msat: u64) -> Result<(), APIError> {
                let _persistence_guard = PersistenceNotifierGuard::notify_on_drop(&self.total_consistency_lock, &self.persistence_notifier);
 
-               let next_hop_scid = match self.channel_state.lock().unwrap().by_id.get(next_hop_channel_id) {
-                       Some(chan) => {
-                               if !chan.is_usable() {
-                                       return Err(APIError::ChannelUnavailable {
-                                               err: format!("Channel with id {} not fully established", log_bytes!(*next_hop_channel_id))
+               let next_hop_scid = {
+                       let peer_state_lock = self.per_peer_state.read().unwrap();
+                       if let Some(peer_state_mutex) = peer_state_lock.get(&next_node_id) {
+                               let mut peer_state_lock = peer_state_mutex.lock().unwrap();
+                               let peer_state = &mut *peer_state_lock;
+                               match peer_state.channel_by_id.get(next_hop_channel_id) {
+                                       Some(chan) => {
+                                               if !chan.is_usable() {
+                                                       return Err(APIError::ChannelUnavailable {
+                                                               err: format!("Channel with id {} not fully established", log_bytes!(*next_hop_channel_id))
+                                                       })
+                                               }
+                                               chan.get_short_channel_id().unwrap_or(chan.outbound_scid_alias())
+                                       },
+                                       None => return Err(APIError::ChannelUnavailable {
+                                               err: format!("Channel with id {} not found for the passed counterparty node_id {}", log_bytes!(*next_hop_channel_id), next_node_id)
                                        })
                                }
-                               chan.get_short_channel_id().unwrap_or(chan.outbound_scid_alias())
-                       },
-                       None => return Err(APIError::ChannelUnavailable {
-                               err: format!("Channel with id {} not found", log_bytes!(*next_hop_channel_id))
-                       })
+                       } else {
+                               return Err(APIError::APIMisuseError{ err: format!("Can't find a peer matching the passed counterparty node_id {}", next_node_id) });
+                       }
                };
 
                let payment = self.pending_intercepted_htlcs.lock().unwrap().remove(&intercept_id)
@@ -2879,16 +2980,22 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
                                                        }
                                                }
                                        }
-                                       let forward_chan_id = match self.short_to_chan_info.read().unwrap().get(&short_chan_id) {
-                                               Some((_cp_id, chan_id)) => chan_id.clone(),
+                                       let (counterparty_node_id, forward_chan_id) = match self.short_to_chan_info.read().unwrap().get(&short_chan_id) {
+                                               Some((cp_id, chan_id)) => (cp_id.clone(), chan_id.clone()),
                                                None => {
                                                        forwarding_channel_not_found!();
                                                        continue;
                                                }
                                        };
-                                       let mut channel_state_lock = self.channel_state.lock().unwrap();
-                                       let channel_state = &mut *channel_state_lock;
-                                       match channel_state.by_id.entry(forward_chan_id) {
+                                       let per_peer_state = self.per_peer_state.read().unwrap();
+                                       let peer_state_mutex_opt = per_peer_state.get(&counterparty_node_id);
+                                       if let None = peer_state_mutex_opt {
+                                               forwarding_channel_not_found!();
+                                               continue;
+                                       }
+                                       let mut peer_state_lock = peer_state_mutex_opt.unwrap().lock().unwrap();
+                                       let peer_state = &mut *peer_state_lock;
+                                       match peer_state.channel_by_id.entry(forward_chan_id) {
                                                hash_map::Entry::Vacant(_) => {
                                                        forwarding_channel_not_found!();
                                                        continue;
@@ -3235,10 +3342,14 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
 
                        let new_feerate = self.fee_estimator.bounded_sat_per_1000_weight(ConfirmationTarget::Normal);
 
-                       let mut channel_state = self.channel_state.lock().unwrap();
-                       for (chan_id, chan) in channel_state.by_id.iter_mut() {
-                               let chan_needs_persist = self.update_channel_fee(chan_id, chan, new_feerate);
-                               if chan_needs_persist == NotifyOption::DoPersist { should_persist = NotifyOption::DoPersist; }
+                       let per_peer_state = self.per_peer_state.read().unwrap();
+                       for (_cp_id, peer_state_mutex) in per_peer_state.iter() {
+                               let mut peer_state_lock = peer_state_mutex.lock().unwrap();
+                               let peer_state = &mut *peer_state_lock;
+                               for (chan_id, chan) in peer_state.channel_by_id.iter_mut() {
+                                       let chan_needs_persist = self.update_channel_fee(chan_id, chan, new_feerate);
+                                       if chan_needs_persist == NotifyOption::DoPersist { should_persist = NotifyOption::DoPersist; }
+                               }
                        }
 
                        should_persist
@@ -3269,47 +3380,52 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
                        {
                                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;
-                               channel_state.by_id.retain(|chan_id, chan| {
-                                       let chan_needs_persist = self.update_channel_fee(chan_id, chan, new_feerate);
-                                       if chan_needs_persist == NotifyOption::DoPersist { should_persist = NotifyOption::DoPersist; }
-
-                                       if let Err(e) = chan.timer_check_closing_negotiation_progress() {
-                                               let (needs_close, err) = convert_chan_err!(self, e, chan, chan_id);
-                                               handle_errors.push((Err(err), chan.get_counterparty_node_id()));
-                                               if needs_close { return false; }
-                                       }
+                               let per_peer_state = self.per_peer_state.read().unwrap();
+                               for (counterparty_node_id, peer_state_mutex) in per_peer_state.iter() {
+                                       let mut peer_state_lock = peer_state_mutex.lock().unwrap();
+                                       let peer_state = &mut *peer_state_lock;
+                                       let pending_msg_events = &mut peer_state.pending_msg_events;
+                                       peer_state.channel_by_id.retain(|chan_id, chan| {
+                                               let chan_needs_persist = self.update_channel_fee(chan_id, chan, new_feerate);
+                                               if chan_needs_persist == NotifyOption::DoPersist { should_persist = NotifyOption::DoPersist; }
+
+                                               if let Err(e) = chan.timer_check_closing_negotiation_progress() {
+                                                       let (needs_close, err) = convert_chan_err!(self, e, chan, chan_id);
+                                                       handle_errors.push((Err(err), *counterparty_node_id));
+                                                       if needs_close { return false; }
+                                               }
 
-                                       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);
-                                               },
-                                               _ => {},
-                                       }
+                                               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);
+                                                       },
+                                                       _ => {},
+                                               }
 
-                                       chan.maybe_expire_prev_config();
+                                               chan.maybe_expire_prev_config();
 
-                                       true
-                               });
+                                               true
+                                       });
+                               }
                        }
 
                        self.claimable_payments.lock().unwrap().claimable_htlcs.retain(|payment_hash, (_, htlcs)| {
@@ -3441,13 +3557,19 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
                &self, mut htlcs_to_fail: Vec<(HTLCSource, PaymentHash)>, channel_id: [u8; 32],
                counterparty_node_id: &PublicKey
        ) {
-               let (failure_code, onion_failure_data) =
-                       match self.channel_state.lock().unwrap().by_id.entry(channel_id) {
-                               hash_map::Entry::Occupied(chan_entry) => {
-                                       self.get_htlc_inbound_temp_fail_err_and_data(0x1000|7, &chan_entry.get())
-                               },
-                               hash_map::Entry::Vacant(_) => (0x4000|10, Vec::new())
-                       };
+               let (failure_code, onion_failure_data) = {
+                       let per_peer_state = self.per_peer_state.read().unwrap();
+                       if let Some(peer_state_mutex) = per_peer_state.get(counterparty_node_id) {
+                               let mut peer_state_lock = peer_state_mutex.lock().unwrap();
+                               let peer_state = &mut *peer_state_lock;
+                               match peer_state.channel_by_id.entry(channel_id) {
+                                       hash_map::Entry::Occupied(chan_entry) => {
+                                               self.get_htlc_inbound_temp_fail_err_and_data(0x1000|7, &chan_entry.get())
+                                       },
+                                       hash_map::Entry::Vacant(_) => (0x4000|10, Vec::new())
+                               }
+                       } else { (0x4000|10, Vec::new()) }
+               };
 
                for (htlc_src, payment_hash) in htlcs_to_fail.drain(..) {
                        let reason = HTLCFailReason::reason(failure_code, onion_failure_data.clone());
@@ -3461,11 +3583,13 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
        fn fail_htlc_backwards_internal(&self, source: &HTLCSource, payment_hash: &PaymentHash, onion_error: &HTLCFailReason, destination: HTLCDestination) {
                #[cfg(debug_assertions)]
                {
-                       // Ensure that the `channel_state` lock is not held when calling this function.
+                       // Ensure that the `channel_state` and no peer state channel storage lock is not held
+                       // when calling this function.
                        // This ensures that future code doesn't introduce a lock_order requirement for
-                       // `forward_htlcs` to be locked after the `channel_state` lock, which calling this
-                       // function with the `channel_state` locked would.
+                       // `forward_htlcs` to be locked after the `channel_state` and `per_peer_state` locks,
+                       // which calling this function with the locks aquired would.
                        assert!(self.channel_state.try_lock().is_ok());
+                       assert!(self.per_peer_state.try_write().is_ok());
                }
 
                //TODO: There is a timing attack here where if a node fails an HTLC back to us they can
@@ -3581,16 +3705,26 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
                let mut valid_mpp = true;
                let mut errs = Vec::new();
                let mut channel_state = Some(self.channel_state.lock().unwrap());
+               let mut per_peer_state = Some(self.per_peer_state.read().unwrap());
                for htlc in sources.iter() {
-                       let chan_id = match self.short_to_chan_info.read().unwrap().get(&htlc.prev_hop.short_channel_id) {
-                               Some((_cp_id, chan_id)) => chan_id.clone(),
+                       let (counterparty_node_id, chan_id) = match self.short_to_chan_info.read().unwrap().get(&htlc.prev_hop.short_channel_id) {
+                               Some((cp_id, chan_id)) => (cp_id.clone(), chan_id.clone()),
                                None => {
                                        valid_mpp = false;
                                        break;
                                }
                        };
 
-                       if let None = channel_state.as_ref().unwrap().by_id.get(&chan_id) {
+                       if let None = per_peer_state.as_ref().unwrap().get(&counterparty_node_id) {
+                               valid_mpp = false;
+                               break;
+                       }
+
+                       let peer_state_mutex = per_peer_state.as_ref().unwrap().get(&counterparty_node_id).unwrap();
+                       let mut peer_state_lock = peer_state_mutex.lock().unwrap();
+                       let peer_state = &mut *peer_state_lock;
+
+                       if let None = peer_state.channel_by_id.get(&chan_id) {
                                valid_mpp = false;
                                break;
                        }
@@ -3601,6 +3735,7 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
                                valid_mpp = false;
                                break;
                        }
+
                        expected_amt_msat = Some(htlc.total_msat);
                        if let OnionPayload::Spontaneous(_) = &htlc.onion_payload {
                                // We don't currently support MPP for spontaneous payments, so just check
@@ -3617,12 +3752,14 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
                }
                if sources.is_empty() || expected_amt_msat.is_none() {
                        mem::drop(channel_state);
+                       mem::drop(per_peer_state);
                        self.claimable_payments.lock().unwrap().pending_claiming_payments.remove(&payment_hash);
                        log_info!(self.logger, "Attempted to claim an incomplete payment which no longer had any available HTLCs!");
                        return;
                }
                if claimable_amt_msat != expected_amt_msat.unwrap() {
                        mem::drop(channel_state);
+                       mem::drop(per_peer_state);
                        self.claimable_payments.lock().unwrap().pending_claiming_payments.remove(&payment_hash);
                        log_info!(self.logger, "Attempted to claim an incomplete payment, expected {} msat, had {} available to claim.",
                                expected_amt_msat.unwrap(), claimable_amt_msat);
@@ -3631,8 +3768,9 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
                if valid_mpp {
                        for htlc in sources.drain(..) {
                                if channel_state.is_none() { channel_state = Some(self.channel_state.lock().unwrap()); }
-                               if let Err((pk, err)) = self.claim_funds_from_hop(channel_state.take().unwrap(), htlc.prev_hop,
-                                       payment_preimage,
+                               if per_peer_state.is_none() { per_peer_state = Some(self.per_peer_state.read().unwrap()); }
+                               if let Err((pk, err)) = self.claim_funds_from_hop(channel_state.take().unwrap(), per_peer_state.take().unwrap(),
+                                       htlc.prev_hop, payment_preimage,
                                        |_| Some(MonitorUpdateCompletionAction::PaymentClaimed { payment_hash }))
                                {
                                        if let msgs::ErrorAction::IgnoreError = err.err.action {
@@ -3644,6 +3782,7 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
                        }
                }
                mem::drop(channel_state);
+               mem::drop(per_peer_state);
                if !valid_mpp {
                        for htlc in sources.drain(..) {
                                let mut htlc_msat_height_data = htlc.value.to_be_bytes().to_vec();
@@ -3664,73 +3803,100 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
        }
 
        fn claim_funds_from_hop<ComplFunc: FnOnce(Option<u64>) -> Option<MonitorUpdateCompletionAction>>(&self,
-               mut channel_state_lock: MutexGuard<ChannelHolder<<K::Target as SignerProvider>::Signer>>,
+               mut channel_state_lock: MutexGuard<ChannelHolder>,
+               per_peer_state_lock: RwLockReadGuard<HashMap<PublicKey, Mutex<PeerState<<K::Target as SignerProvider>::Signer>>>>,
                prev_hop: HTLCPreviousHopData, payment_preimage: PaymentPreimage, completion_action: ComplFunc)
        -> Result<(), (PublicKey, MsgHandleErrInternal)> {
                //TODO: Delay the claimed_funds relaying just like we do outbound relay!
 
                let chan_id = prev_hop.outpoint.to_channel_id();
                let channel_state = &mut *channel_state_lock;
-               if let hash_map::Entry::Occupied(mut chan) = channel_state.by_id.entry(chan_id) {
-                       let counterparty_node_id = chan.get().get_counterparty_node_id();
-                       match chan.get_mut().get_update_fulfill_htlc_and_commit(prev_hop.htlc_id, payment_preimage, &self.logger) {
-                               Ok(msgs_monitor_option) => {
-                                       if let UpdateFulfillCommitFetch::NewClaim { msgs, htlc_value_msat, monitor_update } = msgs_monitor_option {
+
+               let counterparty_node_id_opt = match self.short_to_chan_info.read().unwrap().get(&prev_hop.short_channel_id) {
+                       Some((cp_id, _dup_chan_id)) => Some(cp_id.clone()),
+                       None => None
+               };
+
+               let (found_channel, mut peer_state_opt) = if counterparty_node_id_opt.is_some() && per_peer_state_lock.get(&counterparty_node_id_opt.unwrap()).is_some() {
+                       let peer_mutex = per_peer_state_lock.get(&counterparty_node_id_opt.unwrap()).unwrap();
+                       let peer_state = peer_mutex.lock().unwrap();
+                       let found_channel = peer_state.channel_by_id.contains_key(&chan_id);
+                       (found_channel, Some(peer_state))
+               }  else { (false, None) };
+
+               if found_channel {
+                       let peer_state = &mut *peer_state_opt.as_mut().unwrap();
+                       if let hash_map::Entry::Occupied(mut chan) = peer_state.channel_by_id.entry(chan_id) {
+                               let counterparty_node_id = chan.get().get_counterparty_node_id();
+                               match chan.get_mut().get_update_fulfill_htlc_and_commit(prev_hop.htlc_id, payment_preimage, &self.logger) {
+                                       Ok(msgs_monitor_option) => {
+                                               if let UpdateFulfillCommitFetch::NewClaim { msgs, htlc_value_msat, monitor_update } = msgs_monitor_option {
+                                                       match self.chain_monitor.update_channel(chan.get().get_funding_txo().unwrap(), monitor_update) {
+                                                               ChannelMonitorUpdateStatus::Completed => {},
+                                                               e => {
+                                                                       log_given_level!(self.logger, if e == ChannelMonitorUpdateStatus::PermanentFailure { Level::Error } else { Level::Debug },
+                                                                               "Failed to update channel monitor with preimage {:?}: {:?}",
+                                                                               payment_preimage, e);
+                                                                       let err = handle_monitor_update_res!(self, e, chan, RAACommitmentOrder::CommitmentFirst, false, msgs.is_some()).unwrap_err();
+                                                                       mem::drop(channel_state_lock);
+                                                                       mem::drop(peer_state_opt);
+                                                                       mem::drop(per_peer_state_lock);
+                                                                       self.handle_monitor_update_completion_actions(completion_action(Some(htlc_value_msat)));
+                                                                       return Err((counterparty_node_id, err));
+                                                               }
+                                                       }
+                                                       if let Some((msg, commitment_signed)) = msgs {
+                                                               log_debug!(self.logger, "Claiming funds for HTLC with preimage {} resulted in a commitment_signed for channel {}",
+                                                                       log_bytes!(payment_preimage.0), log_bytes!(chan.get().channel_id()));
+                                                               peer_state.pending_msg_events.push(events::MessageSendEvent::UpdateHTLCs {
+                                                                       node_id: counterparty_node_id,
+                                                                       updates: msgs::CommitmentUpdate {
+                                                                               update_add_htlcs: Vec::new(),
+                                                                               update_fulfill_htlcs: vec![msg],
+                                                                               update_fail_htlcs: Vec::new(),
+                                                                               update_fail_malformed_htlcs: Vec::new(),
+                                                                               update_fee: None,
+                                                                               commitment_signed,
+                                                                       }
+                                                               });
+                                                       }
+                                                       mem::drop(channel_state_lock);
+                                                       mem::drop(peer_state_opt);
+                                                       mem::drop(per_peer_state_lock);
+                                                       self.handle_monitor_update_completion_actions(completion_action(Some(htlc_value_msat)));
+                                                       Ok(())
+                                               } else {
+                                                       Ok(())
+                                               }
+                                       },
+                                       Err((e, monitor_update)) => {
                                                match self.chain_monitor.update_channel(chan.get().get_funding_txo().unwrap(), monitor_update) {
                                                        ChannelMonitorUpdateStatus::Completed => {},
                                                        e => {
-                                                               log_given_level!(self.logger, if e == ChannelMonitorUpdateStatus::PermanentFailure { Level::Error } else { Level::Debug },
-                                                                       "Failed to update channel monitor with preimage {:?}: {:?}",
+                                                               // TODO: This needs to be handled somehow - if we receive a monitor update
+                                                               // with a preimage we *must* somehow manage to propagate it to the upstream
+                                                               // channel, or we must have an ability to receive the same update and try
+                                                               // again on restart.
+                                                               log_given_level!(self.logger, if e == ChannelMonitorUpdateStatus::PermanentFailure { Level::Error } else { Level::Info },
+                                                                       "Failed to update channel monitor with preimage {:?} immediately prior to force-close: {:?}",
                                                                        payment_preimage, e);
-                                                               let err = handle_monitor_update_res!(self, e, chan, RAACommitmentOrder::CommitmentFirst, false, msgs.is_some()).unwrap_err();
-                                                               mem::drop(channel_state_lock);
-                                                               self.handle_monitor_update_completion_actions(completion_action(Some(htlc_value_msat)));
-                                                               return Err((counterparty_node_id, err));
-                                                       }
+                                                       },
                                                }
-                                               if let Some((msg, commitment_signed)) = msgs {
-                                                       log_debug!(self.logger, "Claiming funds for HTLC with preimage {} resulted in a commitment_signed for channel {}",
-                                                               log_bytes!(payment_preimage.0), 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![msg],
-                                                                       update_fail_htlcs: Vec::new(),
-                                                                       update_fail_malformed_htlcs: Vec::new(),
-                                                                       update_fee: None,
-                                                                       commitment_signed,
-                                                               }
-                                                       });
+                                               let (drop, res) = convert_chan_err!(self, e, chan.get_mut(), &chan_id);
+                                               if drop {
+                                                       chan.remove_entry();
                                                }
                                                mem::drop(channel_state_lock);
-                                               self.handle_monitor_update_completion_actions(completion_action(Some(htlc_value_msat)));
-                                               Ok(())
-                                       } else {
-                                               Ok(())
-                                       }
-                               },
-                               Err((e, monitor_update)) => {
-                                       match self.chain_monitor.update_channel(chan.get().get_funding_txo().unwrap(), monitor_update) {
-                                               ChannelMonitorUpdateStatus::Completed => {},
-                                               e => {
-                                                       // TODO: This needs to be handled somehow - if we receive a monitor update
-                                                       // with a preimage we *must* somehow manage to propagate it to the upstream
-                                                       // channel, or we must have an ability to receive the same update and try
-                                                       // again on restart.
-                                                       log_given_level!(self.logger, if e == ChannelMonitorUpdateStatus::PermanentFailure { Level::Error } else { Level::Info },
-                                                               "Failed to update channel monitor with preimage {:?} immediately prior to force-close: {:?}",
-                                                               payment_preimage, e);
-                                               },
-                                       }
-                                       let (drop, res) = convert_chan_err!(self, e, chan.get_mut(), &chan_id);
-                                       if drop {
-                                               chan.remove_entry();
-                                       }
-                                       mem::drop(channel_state_lock);
-                                       self.handle_monitor_update_completion_actions(completion_action(None));
-                                       Err((counterparty_node_id, res))
-                               },
+                                               mem::drop(peer_state_opt);
+                                               mem::drop(per_peer_state_lock);
+                                               self.handle_monitor_update_completion_actions(completion_action(None));
+                                               Err((counterparty_node_id, res))
+                                       },
+                               }
+                       } else {
+                               // We've held the peer_state mutex since finding the channel and setting
+                               // found_channel to true, so the channel can't have been dropped.
+                               unreachable!()
                        }
                } else {
                        let preimage_update = ChannelMonitorUpdate {
@@ -3751,6 +3917,8 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
                                        payment_preimage, update_res);
                        }
                        mem::drop(channel_state_lock);
+                       mem::drop(peer_state_opt);
+                       mem::drop(per_peer_state_lock);
                        // Note that we do process the completion action here. This totally could be a
                        // duplicate claim, but we have no way of knowing without interrogating the
                        // `ChannelMonitor` we've provided the above update to. Instead, note that `Event`s are
@@ -3765,7 +3933,7 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
                self.pending_outbound_payments.finalize_claims(sources, &self.pending_events);
        }
 
-       fn claim_funds_internal(&self, channel_state_lock: MutexGuard<ChannelHolder<<K::Target as SignerProvider>::Signer>>, source: HTLCSource, payment_preimage: PaymentPreimage, forwarded_htlc_value_msat: Option<u64>, from_onchain: bool, next_channel_id: [u8; 32]) {
+       fn claim_funds_internal(&self, channel_state_lock: MutexGuard<ChannelHolder>, source: HTLCSource, payment_preimage: PaymentPreimage, forwarded_htlc_value_msat: Option<u64>, from_onchain: bool, next_channel_id: [u8; 32]) {
                match source {
                        HTLCSource::OutboundRoute { session_priv, payment_id, path, .. } => {
                                mem::drop(channel_state_lock);
@@ -3773,7 +3941,7 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
                        },
                        HTLCSource::PreviousHopData(hop_data) => {
                                let prev_outpoint = hop_data.outpoint;
-                               let res = self.claim_funds_from_hop(channel_state_lock, hop_data, payment_preimage,
+                               let res = self.claim_funds_from_hop(channel_state_lock, self.per_peer_state.read().unwrap(), hop_data, payment_preimage,
                                        |htlc_claim_value_msat| {
                                                if let Some(forwarded_htlc_value) = forwarded_htlc_value_msat {
                                                        let fee_earned_msat = if let Some(claimed_htlc_value) = htlc_claim_value_msat {
@@ -3885,22 +4053,41 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
                htlc_forwards
        }
 
-       fn channel_monitor_updated(&self, funding_txo: &OutPoint, highest_applied_update_id: u64) {
+       fn channel_monitor_updated(&self, funding_txo: &OutPoint, highest_applied_update_id: u64, counterparty_node_id: Option<&PublicKey>) {
                let _persistence_guard = PersistenceNotifierGuard::notify_on_drop(&self.total_consistency_lock, &self.persistence_notifier);
 
                let htlc_forwards;
                let (mut pending_failures, finalized_claims, counterparty_node_id) = {
                        let mut channel_lock = self.channel_state.lock().unwrap();
                        let channel_state = &mut *channel_lock;
-                       let mut channel = match channel_state.by_id.entry(funding_txo.to_channel_id()) {
-                               hash_map::Entry::Occupied(chan) => chan,
-                               hash_map::Entry::Vacant(_) => return,
+                       let counterparty_node_id = match counterparty_node_id {
+                               Some(cp_id) => cp_id.clone(),
+                               None => {
+                                       // TODO: Once we can rely on the counterparty_node_id from the
+                                       // monitor event, this and the id_to_peer map should be removed.
+                                       let id_to_peer = self.id_to_peer.lock().unwrap();
+                                       match id_to_peer.get(&funding_txo.to_channel_id()) {
+                                               Some(cp_id) => cp_id.clone(),
+                                               None => return,
+                                       }
+                               }
+                       };
+                       let per_peer_state = self.per_peer_state.read().unwrap();
+                       let mut peer_state_lock;
+                       let peer_state_mutex_opt = per_peer_state.get(&counterparty_node_id);
+                       if let None = peer_state_mutex_opt { return }
+                       peer_state_lock = peer_state_mutex_opt.unwrap().lock().unwrap();
+                       let peer_state = &mut *peer_state_lock;
+                       let mut channel = {
+                               match peer_state.channel_by_id.entry(funding_txo.to_channel_id()){
+                                       hash_map::Entry::Occupied(chan) => chan,
+                                       hash_map::Entry::Vacant(_) => return,
+                               }
                        };
                        if !channel.get().is_awaiting_monitor_update() || channel.get().get_latest_monitor_update_id() != highest_applied_update_id {
                                return;
                        }
 
-                       let counterparty_node_id = channel.get().get_counterparty_node_id();
                        let updates = channel.get_mut().monitor_updating_restored(&self.logger, self.get_our_node_id(), self.genesis_hash, self.best_block.read().unwrap().height());
                        let channel_update = if updates.channel_ready.is_some() && channel.get().is_usable() {
                                // We only send a channel_update in the case where we are just now sending a
@@ -3915,9 +4102,9 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
                                        })
                                } else { None }
                        } else { None };
-                       htlc_forwards = self.handle_channel_resumption(&mut channel_state.pending_msg_events, channel.get_mut(), updates.raa, updates.commitment_update, updates.order, updates.accepted_htlcs, updates.funding_broadcastable, updates.channel_ready, updates.announcement_sigs);
+                       htlc_forwards = self.handle_channel_resumption(&mut peer_state.pending_msg_events, channel.get_mut(), updates.raa, updates.commitment_update, updates.order, updates.accepted_htlcs, updates.funding_broadcastable, updates.channel_ready, updates.announcement_sigs);
                        if let Some(upd) = channel_update {
-                               channel_state.pending_msg_events.push(upd);
+                               peer_state.pending_msg_events.push(upd);
                        }
 
                        (updates.failed_htlcs, updates.finalized_claimed_htlcs, counterparty_node_id)
@@ -3979,14 +4166,18 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
 
                let mut channel_state_lock = self.channel_state.lock().unwrap();
                let channel_state = &mut *channel_state_lock;
-               match channel_state.by_id.entry(temporary_channel_id.clone()) {
+               let per_peer_state = self.per_peer_state.read().unwrap();
+               let peer_state_mutex_opt = per_peer_state.get(counterparty_node_id);
+               if let None = peer_state_mutex_opt {
+                       return Err(APIError::APIMisuseError { err: format!("Can't find a peer matching the passed counterparty node_id {}", counterparty_node_id) });
+               }
+               let mut peer_state_lock = peer_state_mutex_opt.unwrap().lock().unwrap();
+               let peer_state = &mut *peer_state_lock;
+               match peer_state.channel_by_id.entry(temporary_channel_id.clone()) {
                        hash_map::Entry::Occupied(mut channel) => {
                                if !channel.get().inbound_is_awaiting_accept() {
                                        return Err(APIError::APIMisuseError { err: "The channel isn't currently awaiting to be accepted.".to_owned() });
                                }
-                               if *counterparty_node_id != channel.get().get_counterparty_node_id() {
-                                       return Err(APIError::APIMisuseError { err: "The passed counterparty_node_id doesn't match the channel's counterparty node_id".to_owned() });
-                               }
                                if accept_0conf {
                                        channel.get_mut().set_0conf();
                                } else if channel.get().get_channel_type().requires_zero_conf() {
@@ -3996,18 +4187,18 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
                                                        msg: msgs::ErrorMessage { channel_id: temporary_channel_id.clone(), data: "No zero confirmation channels accepted".to_owned(), }
                                                }
                                        };
-                                       channel_state.pending_msg_events.push(send_msg_err_event);
+                                       peer_state.pending_msg_events.push(send_msg_err_event);
                                        let _ = remove_channel!(self, channel);
                                        return Err(APIError::APIMisuseError { err: "Please use accept_inbound_channel_from_trusted_peer_0conf to accept channels with zero confirmations.".to_owned() });
                                }
 
-                               channel_state.pending_msg_events.push(events::MessageSendEvent::SendAcceptChannel {
+                               peer_state.pending_msg_events.push(events::MessageSendEvent::SendAcceptChannel {
                                        node_id: channel.get().get_counterparty_node_id(),
                                        msg: channel.get_mut().accept_inbound_channel(user_channel_id),
                                });
                        }
                        hash_map::Entry::Vacant(_) => {
-                               return Err(APIError::ChannelUnavailable { err: "Can't accept a channel that doesn't exist".to_owned() });
+                               return Err(APIError::ChannelUnavailable { err: format!("Channel with id {} not found for the passed counterparty node_id {}", log_bytes!(*temporary_channel_id), counterparty_node_id) });
                        }
                }
                Ok(())
@@ -4039,17 +4230,24 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
                };
                let mut channel_state_lock = self.channel_state.lock().unwrap();
                let channel_state = &mut *channel_state_lock;
-               match channel_state.by_id.entry(channel.channel_id()) {
+               let per_peer_state = self.per_peer_state.read().unwrap();
+               let peer_state_mutex_opt = per_peer_state.get(counterparty_node_id);
+               if let None = peer_state_mutex_opt {
+                       return Err(MsgHandleErrInternal::send_err_msg_no_close(format!("Can't find a peer matching the passed counterparty node_id {}", counterparty_node_id), msg.temporary_channel_id.clone()))
+               }
+               let mut peer_state_lock = peer_state_mutex_opt.unwrap().lock().unwrap();
+               let peer_state = &mut *peer_state_lock;
+               match peer_state.channel_by_id.entry(channel.channel_id()) {
                        hash_map::Entry::Occupied(_) => {
                                self.outbound_scid_aliases.lock().unwrap().remove(&outbound_scid_alias);
-                               return Err(MsgHandleErrInternal::send_err_msg_no_close("temporary_channel_id collision!".to_owned(), msg.temporary_channel_id.clone()))
+                               return Err(MsgHandleErrInternal::send_err_msg_no_close("temporary_channel_id collision for the same peer!".to_owned(), msg.temporary_channel_id.clone()))
                        },
                        hash_map::Entry::Vacant(entry) => {
                                if !self.default_configuration.manually_accept_inbound_channels {
                                        if channel.get_channel_type().requires_zero_conf() {
                                                return Err(MsgHandleErrInternal::send_err_msg_no_close("No zero confirmation channels accepted".to_owned(), msg.temporary_channel_id.clone()));
                                        }
-                                       channel_state.pending_msg_events.push(events::MessageSendEvent::SendAcceptChannel {
+                                       peer_state.pending_msg_events.push(events::MessageSendEvent::SendAcceptChannel {
                                                node_id: counterparty_node_id.clone(),
                                                msg: channel.accept_inbound_channel(user_channel_id),
                                        });
@@ -4074,17 +4272,19 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
 
        fn internal_accept_channel(&self, counterparty_node_id: &PublicKey, their_features: InitFeatures, msg: &msgs::AcceptChannel) -> Result<(), MsgHandleErrInternal> {
                let (value, output_script, user_id) = {
-                       let mut channel_lock = self.channel_state.lock().unwrap();
-                       let channel_state = &mut *channel_lock;
-                       match channel_state.by_id.entry(msg.temporary_channel_id) {
+                       let per_peer_state = self.per_peer_state.read().unwrap();
+                       let peer_state_mutex_opt = per_peer_state.get(counterparty_node_id);
+                       if let None = peer_state_mutex_opt {
+                               return Err(MsgHandleErrInternal::send_err_msg_no_close(format!("Can't find a peer matching the passed counterparty node_id {}", counterparty_node_id), msg.temporary_channel_id))
+                       }
+                       let mut peer_state_lock = peer_state_mutex_opt.unwrap().lock().unwrap();
+                       let peer_state = &mut *peer_state_lock;
+                       match peer_state.channel_by_id.entry(msg.temporary_channel_id) {
                                hash_map::Entry::Occupied(mut chan) => {
-                                       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.channel_handshake_limits, &their_features), 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))
+                               hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close(format!("Got a message for a channel from the wrong node! No such channel for the passed counterparty_node_id {}", counterparty_node_id), msg.temporary_channel_id))
                        }
                };
                let mut pending_events = self.pending_events.lock().unwrap();
@@ -4099,21 +4299,25 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
        }
 
        fn internal_funding_created(&self, counterparty_node_id: &PublicKey, msg: &msgs::FundingCreated) -> Result<(), MsgHandleErrInternal> {
+               let mut channel_state_lock = self.channel_state.lock().unwrap();
+               let channel_state = &mut *channel_state_lock;
+               let per_peer_state = self.per_peer_state.read().unwrap();
+               let peer_state_mutex_opt = per_peer_state.get(counterparty_node_id);
+               if let None = peer_state_mutex_opt {
+                       return Err(MsgHandleErrInternal::send_err_msg_no_close(format!("Can't find a peer matching the passed counterparty node_id {}", counterparty_node_id), msg.temporary_channel_id))
+               }
                let ((funding_msg, monitor, mut channel_ready), mut chan) = {
                        let best_block = *self.best_block.read().unwrap();
-                       let mut channel_lock = self.channel_state.lock().unwrap();
-                       let channel_state = &mut *channel_lock;
-                       match channel_state.by_id.entry(msg.temporary_channel_id.clone()) {
+                       let mut peer_state_lock = peer_state_mutex_opt.unwrap().lock().unwrap();
+                       let peer_state = &mut *peer_state_lock;
+                       match peer_state.channel_by_id.entry(msg.temporary_channel_id) {
                                hash_map::Entry::Occupied(mut chan) => {
-                                       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().funding_created(msg, best_block, &self.keys_manager, &self.logger), chan), chan.remove())
                                },
-                               hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel".to_owned(), msg.temporary_channel_id))
+                               hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close(format!("Got a message for a channel from the wrong node! No such channel for the passed counterparty_node_id {}", counterparty_node_id), msg.temporary_channel_id))
                        }
                };
-               // Because we have exclusive ownership of the channel here we can release the channel_state
+               // Because we have exclusive ownership of the channel here we can release the peer_state
                // lock before watch_channel
                match self.chain_monitor.watch_channel(monitor.get_funding_txo().0, monitor) {
                        ChannelMonitorUpdateStatus::Completed => {},
@@ -4138,9 +4342,12 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
                                channel_ready = None; // Don't send the channel_ready now
                        },
                }
-               let mut channel_state_lock = self.channel_state.lock().unwrap();
-               let channel_state = &mut *channel_state_lock;
-               match channel_state.by_id.entry(funding_msg.channel_id) {
+               // It's safe to unwrap as we've held the `per_peer_state` read lock since checking that the
+               // peer exists, despite the inner PeerState potentially having no channels after removing
+               // the channel above.
+               let mut peer_state_lock = peer_state_mutex_opt.unwrap().lock().unwrap();
+               let peer_state = &mut *peer_state_lock;
+               match peer_state.channel_by_id.entry(funding_msg.channel_id) {
                        hash_map::Entry::Occupied(_) => {
                                return Err(MsgHandleErrInternal::send_err_msg_no_close("Already had channel with the new channel_id".to_owned(), funding_msg.channel_id))
                        },
@@ -4156,12 +4363,12 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
                                                i_e.insert(chan.get_counterparty_node_id());
                                        }
                                }
-                               channel_state.pending_msg_events.push(events::MessageSendEvent::SendFundingSigned {
+                               peer_state.pending_msg_events.push(events::MessageSendEvent::SendFundingSigned {
                                        node_id: counterparty_node_id.clone(),
                                        msg: funding_msg,
                                });
                                if let Some(msg) = channel_ready {
-                                       send_channel_ready!(self, channel_state.pending_msg_events, chan, msg);
+                                       send_channel_ready!(self, peer_state.pending_msg_events, chan, msg);
                                }
                                e.insert(chan);
                        }
@@ -4174,11 +4381,16 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
                        let best_block = *self.best_block.read().unwrap();
                        let mut channel_lock = self.channel_state.lock().unwrap();
                        let channel_state = &mut *channel_lock;
-                       match channel_state.by_id.entry(msg.channel_id) {
+                       let per_peer_state = self.per_peer_state.read().unwrap();
+                       let peer_state_mutex_opt = per_peer_state.get(counterparty_node_id);
+                       if let None = peer_state_mutex_opt {
+                               return Err(MsgHandleErrInternal::send_err_msg_no_close(format!("Can't find a peer matching the passed counterparty node_id {}", counterparty_node_id), msg.channel_id))
+                       }
+
+                       let mut peer_state_lock = peer_state_mutex_opt.unwrap().lock().unwrap();
+                       let peer_state = &mut *peer_state_lock;
+                       match peer_state.channel_by_id.entry(msg.channel_id) {
                                hash_map::Entry::Occupied(mut chan) => {
-                                       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.channel_id));
-                                       }
                                        let (monitor, funding_tx, channel_ready) = match chan.get_mut().funding_signed(&msg, best_block, &self.keys_manager, &self.logger) {
                                                Ok(update) => update,
                                                Err(e) => try_chan_entry!(self, Err(e), chan),
@@ -4199,11 +4411,11 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
                                                },
                                        }
                                        if let Some(msg) = channel_ready {
-                                               send_channel_ready!(self, channel_state.pending_msg_events, chan.get(), msg);
+                                               send_channel_ready!(self, peer_state.pending_msg_events, chan.get(), msg);
                                        }
                                        funding_tx
                                },
-                               hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel".to_owned(), msg.channel_id))
+                               hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close(format!("Got a message for a channel from the wrong node! No such channel for the passed counterparty_node_id {}", counterparty_node_id), msg.channel_id))
                        }
                };
                log_info!(self.logger, "Broadcasting funding transaction with txid {}", funding_tx.txid());
@@ -4214,16 +4426,20 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
        fn internal_channel_ready(&self, counterparty_node_id: &PublicKey, msg: &msgs::ChannelReady) -> Result<(), MsgHandleErrInternal> {
                let mut channel_state_lock = self.channel_state.lock().unwrap();
                let channel_state = &mut *channel_state_lock;
-               match channel_state.by_id.entry(msg.channel_id) {
+               let per_peer_state = self.per_peer_state.read().unwrap();
+               let peer_state_mutex_opt = per_peer_state.get(counterparty_node_id);
+               if let None = peer_state_mutex_opt {
+                       return Err(MsgHandleErrInternal::send_err_msg_no_close(format!("Can't find a peer matching the passed counterparty node_id {}", counterparty_node_id), msg.channel_id));
+               }
+               let mut peer_state_lock = peer_state_mutex_opt.unwrap().lock().unwrap();
+               let peer_state = &mut *peer_state_lock;
+               match peer_state.channel_by_id.entry(msg.channel_id) {
                        hash_map::Entry::Occupied(mut chan) => {
-                               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.channel_id));
-                               }
                                let announcement_sigs_opt = try_chan_entry!(self, chan.get_mut().channel_ready(&msg, self.get_our_node_id(),
                                        self.genesis_hash.clone(), &self.best_block.read().unwrap(), &self.logger), chan);
                                if let Some(announcement_sigs) = announcement_sigs_opt {
                                        log_trace!(self.logger, "Sending announcement_signatures for channel {}", log_bytes!(chan.get().channel_id()));
-                                       channel_state.pending_msg_events.push(events::MessageSendEvent::SendAnnouncementSignatures {
+                                       peer_state.pending_msg_events.push(events::MessageSendEvent::SendAnnouncementSignatures {
                                                node_id: counterparty_node_id.clone(),
                                                msg: announcement_sigs,
                                        });
@@ -4235,7 +4451,7 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
                                        // announcement_signatures.
                                        log_trace!(self.logger, "Sending private initial channel_update for our counterparty on channel {}", log_bytes!(chan.get().channel_id()));
                                        if let Ok(msg) = self.get_channel_update_for_unicast(chan.get()) {
-                                               channel_state.pending_msg_events.push(events::MessageSendEvent::SendChannelUpdate {
+                                               peer_state.pending_msg_events.push(events::MessageSendEvent::SendChannelUpdate {
                                                        node_id: counterparty_node_id.clone(),
                                                        msg,
                                                });
@@ -4246,7 +4462,7 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
 
                                Ok(())
                        },
-                       hash_map::Entry::Vacant(_) => Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel".to_owned(), msg.channel_id))
+                       hash_map::Entry::Vacant(_) => Err(MsgHandleErrInternal::send_err_msg_no_close(format!("Got a message for a channel from the wrong node! No such channel for the passed counterparty_node_id {}", counterparty_node_id), msg.channel_id))
                }
        }
 
@@ -4255,12 +4471,15 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
                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(msg.channel_id.clone()) {
+                       let per_peer_state = self.per_peer_state.read().unwrap();
+                       let peer_state_mutex_opt = per_peer_state.get(counterparty_node_id);
+                       if let None = peer_state_mutex_opt {
+                               return Err(MsgHandleErrInternal::send_err_msg_no_close(format!("Can't find a peer matching the passed counterparty node_id {}", counterparty_node_id), msg.channel_id))
+                       }
+                       let mut peer_state_lock = peer_state_mutex_opt.unwrap().lock().unwrap();
+                       let peer_state = &mut *peer_state_lock;
+                       match peer_state.channel_by_id.entry(msg.channel_id.clone()) {
                                hash_map::Entry::Occupied(mut chan_entry) => {
-                                       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));
-                                       }
 
                                        if !chan_entry.get().received_shutdown() {
                                                log_info!(self.logger, "Received a shutdown message from our counterparty for channel {}{}.",
@@ -4283,7 +4502,7 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
                                        }
 
                                        if let Some(msg) = shutdown {
-                                               channel_state.pending_msg_events.push(events::MessageSendEvent::SendShutdown {
+                                               peer_state.pending_msg_events.push(events::MessageSendEvent::SendShutdown {
                                                        node_id: *counterparty_node_id,
                                                        msg,
                                                });
@@ -4291,7 +4510,7 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
 
                                        break Ok(());
                                },
-                               hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel".to_owned(), msg.channel_id))
+                               hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close(format!("Got a message for a channel from the wrong node! No such channel for the passed counterparty_node_id {}", counterparty_node_id), msg.channel_id))
                        }
                };
                for htlc_source in dropped_htlcs.drain(..) {
@@ -4305,17 +4524,19 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
        }
 
        fn internal_closing_signed(&self, counterparty_node_id: &PublicKey, msg: &msgs::ClosingSigned) -> Result<(), MsgHandleErrInternal> {
+               let per_peer_state = self.per_peer_state.read().unwrap();
+               let peer_state_mutex_opt = per_peer_state.get(counterparty_node_id);
+               if let None = peer_state_mutex_opt {
+                       return Err(MsgHandleErrInternal::send_err_msg_no_close(format!("Can't find a peer matching the passed counterparty node_id {}", counterparty_node_id), msg.channel_id))
+               }
                let (tx, chan_option) = {
-                       let mut channel_state_lock = self.channel_state.lock().unwrap();
-                       let channel_state = &mut *channel_state_lock;
-                       match channel_state.by_id.entry(msg.channel_id.clone()) {
+                       let mut peer_state_lock = peer_state_mutex_opt.unwrap().lock().unwrap();
+                       let peer_state = &mut *peer_state_lock;
+                       match peer_state.channel_by_id.entry(msg.channel_id.clone()) {
                                hash_map::Entry::Occupied(mut chan_entry) => {
-                                       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 (closing_signed, tx) = try_chan_entry!(self, chan_entry.get_mut().closing_signed(&self.fee_estimator, &msg), chan_entry);
                                        if let Some(msg) = closing_signed {
-                                               channel_state.pending_msg_events.push(events::MessageSendEvent::SendClosingSigned {
+                                               peer_state.pending_msg_events.push(events::MessageSendEvent::SendClosingSigned {
                                                        node_id: counterparty_node_id.clone(),
                                                        msg,
                                                });
@@ -4329,7 +4550,7 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
                                                (tx, Some(remove_channel!(self, chan_entry)))
                                        } else { (tx, None) }
                                },
-                               hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel".to_owned(), msg.channel_id))
+                               hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close(format!("Got a message for a channel from the wrong node! No such channel for the passed counterparty_node_id {}", counterparty_node_id), msg.channel_id))
                        }
                };
                if let Some(broadcast_tx) = tx {
@@ -4338,8 +4559,9 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
                }
                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 {
+                               let mut peer_state_lock = peer_state_mutex_opt.unwrap().lock().unwrap();
+                               let peer_state = &mut *peer_state_lock;
+                               peer_state.pending_msg_events.push(events::MessageSendEvent::BroadcastChannelUpdate {
                                        msg: update
                                });
                        }
@@ -4359,14 +4581,15 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
                //but we should prevent it anyway.
 
                let pending_forward_info = self.decode_update_add_htlc_onion(msg);
-               let mut channel_state_lock = self.channel_state.lock().unwrap();
-               let channel_state = &mut *channel_state_lock;
-
-               match channel_state.by_id.entry(msg.channel_id) {
+               let per_peer_state = self.per_peer_state.read().unwrap();
+               let peer_state_mutex_opt = per_peer_state.get(counterparty_node_id);
+               if let None = peer_state_mutex_opt {
+                       return Err(MsgHandleErrInternal::send_err_msg_no_close(format!("Can't find a peer matching the passed counterparty node_id {}", counterparty_node_id), msg.channel_id))
+               }
+               let mut peer_state_lock = peer_state_mutex_opt.unwrap().lock().unwrap();
+               let peer_state = &mut *peer_state_lock;
+               match peer_state.channel_by_id.entry(msg.channel_id) {
                        hash_map::Entry::Occupied(mut chan) => {
-                               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.channel_id));
-                               }
 
                                let create_pending_htlc_status = |chan: &Channel<<K::Target as SignerProvider>::Signer>, pending_forward_info: PendingHTLCStatus, error_code: u16| {
                                        // If the update_add is completely bogus, the call will Err and we will close,
@@ -4392,23 +4615,26 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
                                };
                                try_chan_entry!(self, chan.get_mut().update_add_htlc(&msg, pending_forward_info, create_pending_htlc_status, &self.logger), chan);
                        },
-                       hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel".to_owned(), msg.channel_id))
+                       hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close(format!("Got a message for a channel from the wrong node! No such channel for the passed counterparty_node_id {}", counterparty_node_id), msg.channel_id))
                }
                Ok(())
        }
 
        fn internal_update_fulfill_htlc(&self, counterparty_node_id: &PublicKey, msg: &msgs::UpdateFulfillHTLC) -> Result<(), MsgHandleErrInternal> {
-               let mut channel_lock = self.channel_state.lock().unwrap();
+               let channel_lock = self.channel_state.lock().unwrap();
                let (htlc_source, forwarded_htlc_value) = {
-                       let channel_state = &mut *channel_lock;
-                       match channel_state.by_id.entry(msg.channel_id) {
+                       let per_peer_state = self.per_peer_state.read().unwrap();
+                       let peer_state_mutex_opt = per_peer_state.get(counterparty_node_id);
+                       if let None = peer_state_mutex_opt {
+                               return Err(MsgHandleErrInternal::send_err_msg_no_close(format!("Can't find a peer matching the passed counterparty node_id {}", counterparty_node_id), msg.channel_id));
+                       }
+                       let mut peer_state_lock = peer_state_mutex_opt.unwrap().lock().unwrap();
+                       let peer_state = &mut *peer_state_lock;
+                       match peer_state.channel_by_id.entry(msg.channel_id) {
                                hash_map::Entry::Occupied(mut chan) => {
-                                       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.channel_id));
-                                       }
                                        try_chan_entry!(self, chan.get_mut().update_fulfill_htlc(&msg), chan)
                                },
-                               hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel".to_owned(), msg.channel_id))
+                               hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close(format!("Got a message for a channel from the wrong node! No such channel for the passed counterparty_node_id {}", counterparty_node_id), msg.channel_id))
                        }
                };
                self.claim_funds_internal(channel_lock, htlc_source, msg.payment_preimage.clone(), Some(forwarded_htlc_value), false, msg.channel_id);
@@ -4416,28 +4642,32 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
        }
 
        fn internal_update_fail_htlc(&self, counterparty_node_id: &PublicKey, msg: &msgs::UpdateFailHTLC) -> Result<(), MsgHandleErrInternal> {
-               let mut channel_lock = self.channel_state.lock().unwrap();
-               let channel_state = &mut *channel_lock;
-               match channel_state.by_id.entry(msg.channel_id) {
+               let per_peer_state = self.per_peer_state.read().unwrap();
+               let peer_state_mutex_opt = per_peer_state.get(counterparty_node_id);
+               if let None = peer_state_mutex_opt {
+                       return Err(MsgHandleErrInternal::send_err_msg_no_close(format!("Can't find a peer matching the passed counterparty node_id {}", counterparty_node_id), msg.channel_id));
+               }
+               let mut peer_state_lock = peer_state_mutex_opt.unwrap().lock().unwrap();
+               let peer_state = &mut *peer_state_lock;
+               match peer_state.channel_by_id.entry(msg.channel_id) {
                        hash_map::Entry::Occupied(mut chan) => {
-                               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.channel_id));
-                               }
                                try_chan_entry!(self, chan.get_mut().update_fail_htlc(&msg, HTLCFailReason::from_msg(msg)), chan);
                        },
-                       hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel".to_owned(), msg.channel_id))
+                       hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close(format!("Got a message for a channel from the wrong node! No such channel for the passed counterparty_node_id {}", counterparty_node_id), msg.channel_id))
                }
                Ok(())
        }
 
        fn internal_update_fail_malformed_htlc(&self, counterparty_node_id: &PublicKey, msg: &msgs::UpdateFailMalformedHTLC) -> Result<(), MsgHandleErrInternal> {
-               let mut channel_lock = self.channel_state.lock().unwrap();
-               let channel_state = &mut *channel_lock;
-               match channel_state.by_id.entry(msg.channel_id) {
+               let per_peer_state = self.per_peer_state.read().unwrap();
+               let peer_state_mutex_opt = per_peer_state.get(counterparty_node_id);
+               if let None = peer_state_mutex_opt {
+                       return Err(MsgHandleErrInternal::send_err_msg_no_close(format!("Can't find a peer matching the passed counterparty node_id {}", counterparty_node_id), msg.channel_id))
+               }
+               let mut peer_state_lock = peer_state_mutex_opt.unwrap().lock().unwrap();
+               let peer_state = &mut *peer_state_lock;
+               match peer_state.channel_by_id.entry(msg.channel_id) {
                        hash_map::Entry::Occupied(mut chan) => {
-                               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.channel_id));
-                               }
                                if (msg.failure_code & 0x8000) == 0 {
                                        let chan_err: ChannelError = ChannelError::Close("Got update_fail_malformed_htlc with BADONION not set".to_owned());
                                        try_chan_entry!(self, Err(chan_err), chan);
@@ -4445,18 +4675,22 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
                                try_chan_entry!(self, chan.get_mut().update_fail_malformed_htlc(&msg, HTLCFailReason::reason(msg.failure_code, msg.sha256_of_onion.to_vec())), chan);
                                Ok(())
                        },
-                       hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel".to_owned(), msg.channel_id))
+                       hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close(format!("Got a message for a channel from the wrong node! No such channel for the passed counterparty_node_id {}", counterparty_node_id), msg.channel_id))
                }
        }
 
        fn internal_commitment_signed(&self, counterparty_node_id: &PublicKey, msg: &msgs::CommitmentSigned) -> Result<(), MsgHandleErrInternal> {
                let mut channel_state_lock = self.channel_state.lock().unwrap();
                let channel_state = &mut *channel_state_lock;
-               match channel_state.by_id.entry(msg.channel_id) {
+               let per_peer_state = self.per_peer_state.read().unwrap();
+               let peer_state_mutex_opt = per_peer_state.get(counterparty_node_id);
+               if let None = peer_state_mutex_opt {
+                       return Err(MsgHandleErrInternal::send_err_msg_no_close(format!("Can't find a peer matching the passed counterparty node_id {}", counterparty_node_id), msg.channel_id))
+               }
+               let mut peer_state_lock = peer_state_mutex_opt.unwrap().lock().unwrap();
+               let peer_state = &mut *peer_state_lock;
+               match peer_state.channel_by_id.entry(msg.channel_id) {
                        hash_map::Entry::Occupied(mut chan) => {
-                               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.channel_id));
-                               }
                                let (revoke_and_ack, commitment_signed, monitor_update) =
                                        match chan.get_mut().commitment_signed(&msg, &self.logger) {
                                                Err((None, e)) => try_chan_entry!(self, Err(e), chan),
@@ -4473,12 +4707,12 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
                                        return Err(e);
                                }
 
-                               channel_state.pending_msg_events.push(events::MessageSendEvent::SendRevokeAndACK {
+                               peer_state.pending_msg_events.push(events::MessageSendEvent::SendRevokeAndACK {
                                        node_id: counterparty_node_id.clone(),
                                        msg: revoke_and_ack,
                                });
                                if let Some(msg) = commitment_signed {
-                                       channel_state.pending_msg_events.push(events::MessageSendEvent::UpdateHTLCs {
+                                       peer_state.pending_msg_events.push(events::MessageSendEvent::UpdateHTLCs {
                                                node_id: counterparty_node_id.clone(),
                                                updates: msgs::CommitmentUpdate {
                                                        update_add_htlcs: Vec::new(),
@@ -4492,7 +4726,7 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
                                }
                                Ok(())
                        },
-                       hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel".to_owned(), msg.channel_id))
+                       hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close(format!("Got a message for a channel from the wrong node! No such channel for the passed counterparty_node_id {}", counterparty_node_id), msg.channel_id))
                }
        }
 
@@ -4593,11 +4827,15 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
                let res = loop {
                        let mut channel_state_lock = self.channel_state.lock().unwrap();
                        let channel_state = &mut *channel_state_lock;
-                       match channel_state.by_id.entry(msg.channel_id) {
+                       let per_peer_state = self.per_peer_state.read().unwrap();
+                       let peer_state_mutex_opt = per_peer_state.get(counterparty_node_id);
+                       if let None = peer_state_mutex_opt {
+                               break Err(MsgHandleErrInternal::send_err_msg_no_close(format!("Can't find a peer matching the passed counterparty node_id {}", counterparty_node_id), msg.channel_id))
+                       }
+                       let mut peer_state_lock = peer_state_mutex_opt.unwrap().lock().unwrap();
+                       let peer_state = &mut *peer_state_lock;
+                       match peer_state.channel_by_id.entry(msg.channel_id) {
                                hash_map::Entry::Occupied(mut chan) => {
-                                       if chan.get().get_counterparty_node_id() != *counterparty_node_id {
-                                               break Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!".to_owned(), msg.channel_id));
-                                       }
                                        let was_paused_for_mon_update = chan.get().is_awaiting_monitor_update();
                                        let raa_updates = break_chan_entry!(self,
                                                chan.get_mut().revoke_and_ack(&msg, &self.logger), chan);
@@ -4621,7 +4859,7 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
                                                } else { unreachable!(); }
                                        }
                                        if let Some(updates) = raa_updates.commitment_update {
-                                               channel_state.pending_msg_events.push(events::MessageSendEvent::UpdateHTLCs {
+                                               peer_state.pending_msg_events.push(events::MessageSendEvent::UpdateHTLCs {
                                                        node_id: counterparty_node_id.clone(),
                                                        updates,
                                                });
@@ -4633,7 +4871,7 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
                                                        chan.get().get_funding_txo().unwrap(),
                                                        chan.get().get_user_id()))
                                },
-                               hash_map::Entry::Vacant(_) => break Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel".to_owned(), msg.channel_id))
+                               hash_map::Entry::Vacant(_) => break Err(MsgHandleErrInternal::send_err_msg_no_close(format!("Got a message for a channel from the wrong node! No such channel for the passed counterparty_node_id {}", counterparty_node_id), msg.channel_id))
                        }
                };
                self.fail_holding_cell_htlcs(htlcs_to_fail, msg.channel_id, counterparty_node_id);
@@ -4654,16 +4892,18 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
        }
 
        fn internal_update_fee(&self, counterparty_node_id: &PublicKey, msg: &msgs::UpdateFee) -> Result<(), MsgHandleErrInternal> {
-               let mut channel_lock = self.channel_state.lock().unwrap();
-               let channel_state = &mut *channel_lock;
-               match channel_state.by_id.entry(msg.channel_id) {
+               let per_peer_state = self.per_peer_state.read().unwrap();
+               let peer_state_mutex_opt = per_peer_state.get(counterparty_node_id);
+               if let None = peer_state_mutex_opt {
+                       return Err(MsgHandleErrInternal::send_err_msg_no_close(format!("Can't find a peer matching the passed counterparty node_id {}", counterparty_node_id), msg.channel_id));
+               }
+               let mut peer_state_lock = peer_state_mutex_opt.unwrap().lock().unwrap();
+               let peer_state = &mut *peer_state_lock;
+               match peer_state.channel_by_id.entry(msg.channel_id) {
                        hash_map::Entry::Occupied(mut chan) => {
-                               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.channel_id));
-                               }
                                try_chan_entry!(self, chan.get_mut().update_fee(&self.fee_estimator, &msg, &self.logger), chan);
                        },
-                       hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel".to_owned(), msg.channel_id))
+                       hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close(format!("Got a message for a channel from the wrong node! No such channel for the passed counterparty_node_id {}", counterparty_node_id), msg.channel_id))
                }
                Ok(())
        }
@@ -4671,17 +4911,20 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
        fn internal_announcement_signatures(&self, counterparty_node_id: &PublicKey, msg: &msgs::AnnouncementSignatures) -> Result<(), MsgHandleErrInternal> {
                let mut channel_state_lock = self.channel_state.lock().unwrap();
                let channel_state = &mut *channel_state_lock;
-
-               match channel_state.by_id.entry(msg.channel_id) {
+               let per_peer_state = self.per_peer_state.read().unwrap();
+               let peer_state_mutex_opt = per_peer_state.get(counterparty_node_id);
+               if let None = peer_state_mutex_opt {
+                       return Err(MsgHandleErrInternal::send_err_msg_no_close(format!("Can't find a peer matching the passed counterparty node_id {}", counterparty_node_id), msg.channel_id));
+               }
+               let mut peer_state_lock = peer_state_mutex_opt.unwrap().lock().unwrap();
+               let peer_state = &mut *peer_state_lock;
+               match peer_state.channel_by_id.entry(msg.channel_id) {
                        hash_map::Entry::Occupied(mut chan) => {
-                               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.channel_id));
-                               }
                                if !chan.get().is_usable() {
                                        return Err(MsgHandleErrInternal::from_no_close(LightningError{err: "Got an announcement_signatures before we were ready for it".to_owned(), action: msgs::ErrorAction::IgnoreError}));
                                }
 
-                               channel_state.pending_msg_events.push(events::MessageSendEvent::BroadcastChannelAnnouncement {
+                               peer_state.pending_msg_events.push(events::MessageSendEvent::BroadcastChannelAnnouncement {
                                        msg: try_chan_entry!(self, chan.get_mut().announcement_signatures(
                                                self.get_our_node_id(), self.genesis_hash.clone(), self.best_block.read().unwrap().height(), msg), chan),
                                        // Note that announcement_signatures fails if the channel cannot be announced,
@@ -4689,23 +4932,28 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
                                        update_msg: self.get_channel_update_for_broadcast(chan.get()).unwrap(),
                                });
                        },
-                       hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel".to_owned(), msg.channel_id))
+                       hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close(format!("Got a message for a channel from the wrong node! No such channel for the passed counterparty_node_id {}", counterparty_node_id), msg.channel_id))
                }
                Ok(())
        }
 
        /// Returns ShouldPersist if anything changed, otherwise either SkipPersist or an Err.
        fn internal_channel_update(&self, counterparty_node_id: &PublicKey, msg: &msgs::ChannelUpdate) -> Result<NotifyOption, MsgHandleErrInternal> {
-               let chan_id = match self.short_to_chan_info.read().unwrap().get(&msg.contents.short_channel_id) {
-                       Some((_cp_id, chan_id)) => chan_id.clone(),
+               let (chan_counterparty_node_id, chan_id) = match self.short_to_chan_info.read().unwrap().get(&msg.contents.short_channel_id) {
+                       Some((cp_id, chan_id)) => (cp_id.clone(), chan_id.clone()),
                        None => {
                                // It's not a local channel
                                return Ok(NotifyOption::SkipPersist)
                        }
                };
-               let mut channel_state_lock = self.channel_state.lock().unwrap();
-               let channel_state = &mut *channel_state_lock;
-               match channel_state.by_id.entry(chan_id) {
+               let per_peer_state = self.per_peer_state.read().unwrap();
+               let peer_state_mutex_opt = per_peer_state.get(&chan_counterparty_node_id);
+               if let None = peer_state_mutex_opt {
+                       return Ok(NotifyOption::SkipPersist)
+               }
+               let mut peer_state_lock = peer_state_mutex_opt.unwrap().lock().unwrap();
+               let peer_state = &mut *peer_state_lock;
+               match peer_state.channel_by_id.entry(chan_id) {
                        hash_map::Entry::Occupied(mut chan) => {
                                if chan.get().get_counterparty_node_id() != *counterparty_node_id {
                                        if chan.get().should_announce() {
@@ -4735,12 +4983,16 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
                let need_lnd_workaround = {
                        let mut channel_state_lock = self.channel_state.lock().unwrap();
                        let channel_state = &mut *channel_state_lock;
+                       let per_peer_state = self.per_peer_state.read().unwrap();
 
-                       match channel_state.by_id.entry(msg.channel_id) {
+                       let peer_state_mutex_opt = per_peer_state.get(counterparty_node_id);
+                       if let None = peer_state_mutex_opt {
+                               return Err(MsgHandleErrInternal::send_err_msg_no_close(format!("Can't find a peer matching the passed counterparty node_id {}", counterparty_node_id), msg.channel_id));
+                       }
+                       let mut peer_state_lock = peer_state_mutex_opt.unwrap().lock().unwrap();
+                       let peer_state = &mut *peer_state_lock;
+                       match peer_state.channel_by_id.entry(msg.channel_id) {
                                hash_map::Entry::Occupied(mut chan) => {
-                                       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.channel_id));
-                                       }
                                        // Currently, we expect all holding cell update_adds to be dropped on peer
                                        // disconnect, so Channel's reestablish will never hand us any holding cell
                                        // freed HTLCs to fail backwards. If in the future we no longer drop pending
@@ -4750,7 +5002,7 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
                                                &*self.best_block.read().unwrap()), chan);
                                        let mut channel_update = None;
                                        if let Some(msg) = responses.shutdown_msg {
-                                               channel_state.pending_msg_events.push(events::MessageSendEvent::SendShutdown {
+                                               peer_state.pending_msg_events.push(events::MessageSendEvent::SendShutdown {
                                                        node_id: counterparty_node_id.clone(),
                                                        msg,
                                                });
@@ -4767,14 +5019,14 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
                                        }
                                        let need_lnd_workaround = chan.get_mut().workaround_lnd_bug_4006.take();
                                        htlc_forwards = self.handle_channel_resumption(
-                                               &mut channel_state.pending_msg_events, chan.get_mut(), responses.raa, responses.commitment_update, responses.order,
+                                               &mut peer_state.pending_msg_events, chan.get_mut(), responses.raa, responses.commitment_update, responses.order,
                                                Vec::new(), None, responses.channel_ready, responses.announcement_sigs);
                                        if let Some(upd) = channel_update {
-                                               channel_state.pending_msg_events.push(upd);
+                                               peer_state.pending_msg_events.push(upd);
                                        }
                                        need_lnd_workaround
                                },
-                               hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel".to_owned(), msg.channel_id))
+                               hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close(format!("Got a message for a channel from the wrong node! No such channel for the passed counterparty_node_id {}", counterparty_node_id), msg.channel_id))
                        }
                };
 
@@ -4811,32 +5063,47 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
                                        MonitorEvent::UpdateFailed(funding_outpoint) => {
                                                let mut channel_lock = self.channel_state.lock().unwrap();
                                                let channel_state = &mut *channel_lock;
-                                               let by_id = &mut channel_state.by_id;
-                                               let pending_msg_events = &mut channel_state.pending_msg_events;
-                                               if let hash_map::Entry::Occupied(chan_entry) = by_id.entry(funding_outpoint.to_channel_id()) {
-                                                       let mut chan = remove_channel!(self, chan_entry);
-                                                       failed_channels.push(chan.force_shutdown(false));
-                                                       if let Ok(update) = self.get_channel_update_for_broadcast(&chan) {
-                                                               pending_msg_events.push(events::MessageSendEvent::BroadcastChannelUpdate {
-                                                                       msg: update
-                                                               });
+                                               let counterparty_node_id_opt = match counterparty_node_id {
+                                                       Some(cp_id) => Some(cp_id),
+                                                       None => {
+                                                               // TODO: Once we can rely on the counterparty_node_id from the
+                                                               // monitor event, this and the id_to_peer map should be removed.
+                                                               let id_to_peer = self.id_to_peer.lock().unwrap();
+                                                               id_to_peer.get(&funding_outpoint.to_channel_id()).cloned()
+                                                       }
+                                               };
+                                               if let Some(counterparty_node_id) = counterparty_node_id_opt {
+                                                       let per_peer_state = self.per_peer_state.read().unwrap();
+                                                       if let Some(peer_state_mutex) = per_peer_state.get(&counterparty_node_id) {
+                                                               let mut peer_state_lock = peer_state_mutex.lock().unwrap();
+                                                               let peer_state = &mut *peer_state_lock;
+                                                               let pending_msg_events = &mut peer_state.pending_msg_events;
+                                                               if let hash_map::Entry::Occupied(chan_entry) = peer_state.channel_by_id.entry(funding_outpoint.to_channel_id()) {
+                                                                       let mut chan = remove_channel!(self, chan_entry);
+                                                                       failed_channels.push(chan.force_shutdown(false));
+                                                                       if let Ok(update) = self.get_channel_update_for_broadcast(&chan) {
+                                                                               pending_msg_events.push(events::MessageSendEvent::BroadcastChannelUpdate {
+                                                                                       msg: update
+                                                                               });
+                                                                       }
+                                                                       let reason = if let MonitorEvent::UpdateFailed(_) = monitor_event {
+                                                                               ClosureReason::ProcessingError { err: "Failed to persist ChannelMonitor update during chain sync".to_string() }
+                                                                       } else {
+                                                                               ClosureReason::CommitmentTxConfirmed
+                                                                       };
+                                                                       self.issue_channel_close_events(&chan, reason);
+                                                                       pending_msg_events.push(events::MessageSendEvent::HandleError {
+                                                                               node_id: chan.get_counterparty_node_id(),
+                                                                               action: msgs::ErrorAction::SendErrorMessage {
+                                                                                       msg: msgs::ErrorMessage { channel_id: chan.channel_id(), data: "Channel force-closed".to_owned() }
+                                                                               },
+                                                                       });
+                                                               }
                                                        }
-                                                       let reason = if let MonitorEvent::UpdateFailed(_) = monitor_event {
-                                                               ClosureReason::ProcessingError { err: "Failed to persist ChannelMonitor update during chain sync".to_string() }
-                                                       } else {
-                                                               ClosureReason::CommitmentTxConfirmed
-                                                       };
-                                                       self.issue_channel_close_events(&chan, reason);
-                                                       pending_msg_events.push(events::MessageSendEvent::HandleError {
-                                                               node_id: chan.get_counterparty_node_id(),
-                                                               action: msgs::ErrorAction::SendErrorMessage {
-                                                                       msg: msgs::ErrorMessage { channel_id: chan.channel_id(), data: "Channel force-closed".to_owned() }
-                                                               },
-                                                       });
                                                }
                                        },
                                        MonitorEvent::Completed { funding_txo, monitor_update_id } => {
-                                               self.channel_monitor_updated(&funding_txo, monitor_update_id);
+                                               self.channel_monitor_updated(&funding_txo, monitor_update_id, counterparty_node_id.as_ref());
                                        },
                                }
                        }
@@ -4867,45 +5134,49 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
                {
                        let mut channel_state_lock = self.channel_state.lock().unwrap();
                        let channel_state = &mut *channel_state_lock;
-                       let by_id = &mut channel_state.by_id;
-                       let pending_msg_events = &mut channel_state.pending_msg_events;
-
-                       by_id.retain(|channel_id, chan| {
-                               match chan.maybe_free_holding_cell_htlcs(&self.logger) {
-                                       Ok((commitment_opt, holding_cell_failed_htlcs)) => {
-                                               if !holding_cell_failed_htlcs.is_empty() {
-                                                       failed_htlcs.push((
-                                                               holding_cell_failed_htlcs,
-                                                               *channel_id,
-                                                               chan.get_counterparty_node_id()
-                                                       ));
-                                               }
-                                               if let Some((commitment_update, monitor_update)) = commitment_opt {
-                                                       match self.chain_monitor.update_channel(chan.get_funding_txo().unwrap(), monitor_update) {
-                                                               ChannelMonitorUpdateStatus::Completed => {
-                                                                       pending_msg_events.push(events::MessageSendEvent::UpdateHTLCs {
-                                                                               node_id: chan.get_counterparty_node_id(),
-                                                                               updates: commitment_update,
-                                                                       });
-                                                               },
-                                                               e => {
-                                                                       has_monitor_update = true;
-                                                                       let (res, close_channel) = handle_monitor_update_res!(self, e, chan, RAACommitmentOrder::CommitmentFirst, channel_id, COMMITMENT_UPDATE_ONLY);
-                                                                       handle_errors.push((chan.get_counterparty_node_id(), res));
-                                                                       if close_channel { return false; }
-                                                               },
+                       let per_peer_state = self.per_peer_state.read().unwrap();
+
+                       for (_cp_id, peer_state_mutex) in per_peer_state.iter() {
+                               let mut peer_state_lock = peer_state_mutex.lock().unwrap();
+                               let peer_state = &mut *peer_state_lock;
+                               let pending_msg_events = &mut peer_state.pending_msg_events;
+                               peer_state.channel_by_id.retain(|channel_id, chan| {
+                                       match chan.maybe_free_holding_cell_htlcs(&self.logger) {
+                                               Ok((commitment_opt, holding_cell_failed_htlcs)) => {
+                                                       if !holding_cell_failed_htlcs.is_empty() {
+                                                               failed_htlcs.push((
+                                                                       holding_cell_failed_htlcs,
+                                                                       *channel_id,
+                                                                       chan.get_counterparty_node_id()
+                                                               ));
                                                        }
+                                                       if let Some((commitment_update, monitor_update)) = commitment_opt {
+                                                               match self.chain_monitor.update_channel(chan.get_funding_txo().unwrap(), monitor_update) {
+                                                                       ChannelMonitorUpdateStatus::Completed => {
+                                                                               pending_msg_events.push(events::MessageSendEvent::UpdateHTLCs {
+                                                                                       node_id: chan.get_counterparty_node_id(),
+                                                                                       updates: commitment_update,
+                                                                               });
+                                                                       },
+                                                                       e => {
+                                                                               has_monitor_update = true;
+                                                                               let (res, close_channel) = handle_monitor_update_res!(self, e, chan, RAACommitmentOrder::CommitmentFirst, channel_id, COMMITMENT_UPDATE_ONLY);
+                                                                               handle_errors.push((chan.get_counterparty_node_id(), res));
+                                                                               if close_channel { return false; }
+                                                                       },
+                                                               }
+                                                       }
+                                                       true
+                                               },
+                                               Err(e) => {
+                                                       let (close_channel, res) = convert_chan_err!(self, e, chan, channel_id);
+                                                       handle_errors.push((chan.get_counterparty_node_id(), Err(res)));
+                                                       // ChannelClosed event is generated by handle_error for us
+                                                       !close_channel
                                                }
-                                               true
-                                       },
-                                       Err(e) => {
-                                               let (close_channel, res) = convert_chan_err!(self, e, chan, channel_id);
-                                               handle_errors.push((chan.get_counterparty_node_id(), Err(res)));
-                                               // ChannelClosed event is generated by handle_error for us
-                                               !close_channel
                                        }
-                               }
-                       });
+                               });
+                       }
                }
 
                let has_update = has_monitor_update || !failed_htlcs.is_empty() || !handle_errors.is_empty();
@@ -4929,43 +5200,47 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
                {
                        let mut channel_state_lock = self.channel_state.lock().unwrap();
                        let channel_state = &mut *channel_state_lock;
-                       let by_id = &mut channel_state.by_id;
-                       let pending_msg_events = &mut channel_state.pending_msg_events;
+                       let per_peer_state = self.per_peer_state.read().unwrap();
 
-                       by_id.retain(|channel_id, chan| {
-                               match chan.maybe_propose_closing_signed(&self.fee_estimator, &self.logger) {
-                                       Ok((msg_opt, tx_opt)) => {
-                                               if let Some(msg) = msg_opt {
-                                                       has_update = true;
-                                                       pending_msg_events.push(events::MessageSendEvent::SendClosingSigned {
-                                                               node_id: chan.get_counterparty_node_id(), msg,
-                                                       });
-                                               }
-                                               if let Some(tx) = tx_opt {
-                                                       // We're done with this channel. We got a closing_signed and sent back
-                                                       // a closing_signed with a closing transaction to broadcast.
-                                                       if let Ok(update) = self.get_channel_update_for_broadcast(&chan) {
-                                                               pending_msg_events.push(events::MessageSendEvent::BroadcastChannelUpdate {
-                                                                       msg: update
+                       for (_cp_id, peer_state_mutex) in per_peer_state.iter() {
+                               let mut peer_state_lock = peer_state_mutex.lock().unwrap();
+                               let peer_state = &mut *peer_state_lock;
+                               let pending_msg_events = &mut peer_state.pending_msg_events;
+                               peer_state.channel_by_id.retain(|channel_id, chan| {
+                                       match chan.maybe_propose_closing_signed(&self.fee_estimator, &self.logger) {
+                                               Ok((msg_opt, tx_opt)) => {
+                                                       if let Some(msg) = msg_opt {
+                                                               has_update = true;
+                                                               pending_msg_events.push(events::MessageSendEvent::SendClosingSigned {
+                                                                       node_id: chan.get_counterparty_node_id(), msg,
                                                                });
                                                        }
+                                                       if let Some(tx) = tx_opt {
+                                                               // We're done with this channel. We got a closing_signed and sent back
+                                                               // a closing_signed with a closing transaction to broadcast.
+                                                               if let Ok(update) = self.get_channel_update_for_broadcast(&chan) {
+                                                                       pending_msg_events.push(events::MessageSendEvent::BroadcastChannelUpdate {
+                                                                               msg: update
+                                                                       });
+                                                               }
 
-                                                       self.issue_channel_close_events(chan, ClosureReason::CooperativeClosure);
+                                                               self.issue_channel_close_events(chan, ClosureReason::CooperativeClosure);
 
-                                                       log_info!(self.logger, "Broadcasting {}", log_tx!(tx));
-                                                       self.tx_broadcaster.broadcast_transaction(&tx);
-                                                       update_maps_on_chan_removal!(self, chan);
-                                                       false
-                                               } else { true }
-                                       },
-                                       Err(e) => {
-                                               has_update = true;
-                                               let (close_channel, res) = convert_chan_err!(self, e, chan, channel_id);
-                                               handle_errors.push((chan.get_counterparty_node_id(), Err(res)));
-                                               !close_channel
+                                                               log_info!(self.logger, "Broadcasting {}", log_tx!(tx));
+                                                               self.tx_broadcaster.broadcast_transaction(&tx);
+                                                               update_maps_on_chan_removal!(self, chan);
+                                                               false
+                                                       } else { true }
+                                               },
+                                               Err(e) => {
+                                                       has_update = true;
+                                                       let (close_channel, res) = convert_chan_err!(self, e, chan, channel_id);
+                                                       handle_errors.push((chan.get_counterparty_node_id(), Err(res)));
+                                                       !close_channel
+                                               }
                                        }
-                               }
-                       });
+                               });
+                       }
                }
 
                for (counterparty_node_id, err) in handle_errors.drain(..) {
@@ -5195,10 +5470,15 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
        pub fn compute_inflight_htlcs(&self) -> InFlightHtlcs {
                let mut inflight_htlcs = InFlightHtlcs::new();
 
-               for chan in self.channel_state.lock().unwrap().by_id.values() {
-                       for (htlc_source, _) in chan.inflight_htlc_sources() {
-                               if let HTLCSource::OutboundRoute { path, .. } = htlc_source {
-                                       inflight_htlcs.process_path(path, self.get_our_node_id());
+               let per_peer_state = self.per_peer_state.read().unwrap();
+               for (_cp_id, peer_state_mutex) in per_peer_state.iter() {
+                       let mut peer_state_lock = peer_state_mutex.lock().unwrap();
+                       let peer_state = &mut *peer_state_lock;
+                       for chan in peer_state.channel_by_id.values() {
+                               for (htlc_source, _) in chan.inflight_htlc_sources() {
+                                       if let HTLCSource::OutboundRoute { path, .. } = htlc_source {
+                                               inflight_htlcs.process_path(path, self.get_our_node_id());
+                                       }
                                }
                        }
                }
@@ -5264,13 +5544,28 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F
        }
 }
 
-impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> MessageSendEventsProvider for ChannelManager<M, T, K, F, L>
-       where M::Target: chain::Watch<<K::Target as SignerProvider>::Signer>,
-        T::Target: BroadcasterInterface,
-        K::Target: KeysInterface,
-        F::Target: FeeEstimator,
-                               L::Target: Logger,
+impl<M: Deref, T: Deref, K: Deref, F: Deref, R: Deref, L: Deref> MessageSendEventsProvider for ChannelManager<M, T, K, F, R, L>
+where
+       M::Target: chain::Watch<<K::Target as SignerProvider>::Signer>,
+       T::Target: BroadcasterInterface,
+       K::Target: KeysInterface,
+       F::Target: FeeEstimator,
+       R::Target: Router,
+       L::Target: Logger,
 {
+       /// Returns `MessageSendEvent`s strictly ordered per-peer, in the order they were generated.
+       /// The returned array will contain `MessageSendEvent`s for different peers if
+       /// `MessageSendEvent`s to more than one peer exists, but `MessageSendEvent`s to the same peer
+       /// is always placed next to each other.
+       ///
+       /// Note that that while `MessageSendEvent`s are strictly ordered per-peer, the peer order for
+       /// the chunks of `MessageSendEvent`s for different peers is random. I.e. if the array contains
+       /// `MessageSendEvent`s  for both `node_a` and `node_b`, the `MessageSendEvent`s for `node_a`
+       /// will randomly be placed first or last in the returned array.
+       ///
+       /// Note that even though `BroadcastChannelAnnouncement` and `BroadcastChannelUpdate`
+       /// `MessageSendEvent`s are intended to be broadcasted to all peers, they will be pleaced among
+       /// the `MessageSendEvent`s to the specific peer they were generated under.
        fn get_and_clear_pending_msg_events(&self) -> Vec<MessageSendEvent> {
                let events = RefCell::new(Vec::new());
                PersistenceNotifierGuard::optionally_notify(&self.total_consistency_lock, &self.persistence_notifier, || {
@@ -5290,8 +5585,16 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> MessageSendEventsProvider
                        }
 
                        let mut pending_events = Vec::new();
-                       let mut channel_state = self.channel_state.lock().unwrap();
-                       mem::swap(&mut pending_events, &mut channel_state.pending_msg_events);
+                       let per_peer_state = self.per_peer_state.read().unwrap();
+                       for (_cp_id, peer_state_mutex) in per_peer_state.iter() {
+                               let mut peer_state_lock = peer_state_mutex.lock().unwrap();
+                               let peer_state = &mut *peer_state_lock;
+                               if peer_state.pending_msg_events.len() > 0 {
+                                       let mut peer_pending_events = Vec::new();
+                                       mem::swap(&mut peer_pending_events, &mut peer_state.pending_msg_events);
+                                       pending_events.append(&mut peer_pending_events);
+                               }
+                       }
 
                        if !pending_events.is_empty() {
                                events.replace(pending_events);
@@ -5303,12 +5606,13 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> MessageSendEventsProvider
        }
 }
 
-impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> EventsProvider for ChannelManager<M, T, K, F, L>
+impl<M: Deref, T: Deref, K: Deref, F: Deref, R: Deref, L: Deref> EventsProvider for ChannelManager<M, T, K, F, R, L>
 where
        M::Target: chain::Watch<<K::Target as SignerProvider>::Signer>,
        T::Target: BroadcasterInterface,
        K::Target: KeysInterface,
        F::Target: FeeEstimator,
+       R::Target: Router,
        L::Target: Logger,
 {
        /// Processes events that must be periodically handled.
@@ -5339,12 +5643,13 @@ where
        }
 }
 
-impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> chain::Listen for ChannelManager<M, T, K, F, L>
+impl<M: Deref, T: Deref, K: Deref, F: Deref, R: Deref, L: Deref> chain::Listen for ChannelManager<M, T, K, F, R, L>
 where
        M::Target: chain::Watch<<K::Target as SignerProvider>::Signer>,
        T::Target: BroadcasterInterface,
        K::Target: KeysInterface,
        F::Target: FeeEstimator,
+       R::Target: Router,
        L::Target: Logger,
 {
        fn filtered_block_connected(&self, header: &BlockHeader, txdata: &TransactionData, height: u32) {
@@ -5376,12 +5681,13 @@ where
        }
 }
 
-impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> chain::Confirm for ChannelManager<M, T, K, F, L>
+impl<M: Deref, T: Deref, K: Deref, F: Deref, R: Deref, L: Deref> chain::Confirm for ChannelManager<M, T, K, F, R, L>
 where
        M::Target: chain::Watch<<K::Target as SignerProvider>::Signer>,
        T::Target: BroadcasterInterface,
        K::Target: KeysInterface,
        F::Target: FeeEstimator,
+       R::Target: Router,
        L::Target: Logger,
 {
        fn transactions_confirmed(&self, header: &BlockHeader, txdata: &TransactionData, height: u32) {
@@ -5441,11 +5747,14 @@ where
        }
 
        fn get_relevant_txids(&self) -> Vec<(Txid, Option<BlockHash>)> {
-               let channel_state = self.channel_state.lock().unwrap();
-               let mut res = Vec::with_capacity(channel_state.by_id.len());
-               for chan in channel_state.by_id.values() {
-                       if let (Some(funding_txo), block_hash) = (chan.get_funding_txo(), chan.get_funding_tx_confirmed_in()) {
-                               res.push((funding_txo.txid, block_hash));
+               let mut res = Vec::with_capacity(self.short_to_chan_info.read().unwrap().len());
+               for (_cp_id, peer_state_mutex) in self.per_peer_state.read().unwrap().iter() {
+                       let mut peer_state_lock = peer_state_mutex.lock().unwrap();
+                       let peer_state = &mut *peer_state_lock;
+                       for chan in peer_state.channel_by_id.values() {
+                               if let (Some(funding_txo), block_hash) = (chan.get_funding_txo(), chan.get_funding_tx_confirmed_in()) {
+                                       res.push((funding_txo.txid, block_hash));
+                               }
                        }
                }
                res
@@ -5463,12 +5772,13 @@ where
        }
 }
 
-impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<M, T, K, F, L>
+impl<M: Deref, T: Deref, K: Deref, F: Deref, R: Deref, L: Deref> ChannelManager<M, T, K, F, R, L>
 where
        M::Target: chain::Watch<<K::Target as SignerProvider>::Signer>,
        T::Target: BroadcasterInterface,
        K::Target: KeysInterface,
        F::Target: FeeEstimator,
+       R::Target: Router,
        L::Target: Logger,
 {
        /// Calls a function which handles an on-chain event (blocks dis/connected, transactions
@@ -5485,87 +5795,92 @@ where
                {
                        let mut channel_lock = self.channel_state.lock().unwrap();
                        let channel_state = &mut *channel_lock;
-                       let pending_msg_events = &mut channel_state.pending_msg_events;
-                       channel_state.by_id.retain(|_, channel| {
-                               let res = f(channel);
-                               if let Ok((channel_ready_opt, mut timed_out_pending_htlcs, announcement_sigs)) = res {
-                                       for (source, payment_hash) in timed_out_pending_htlcs.drain(..) {
-                                               let (failure_code, data) = self.get_htlc_inbound_temp_fail_err_and_data(0x1000|14 /* expiry_too_soon */, &channel);
-                                               timed_out_htlcs.push((source, payment_hash, HTLCFailReason::reason(failure_code, data),
-                                                       HTLCDestination::NextHopChannel { node_id: Some(channel.get_counterparty_node_id()), channel_id: channel.channel_id() }));
-                                       }
-                                       if let Some(channel_ready) = channel_ready_opt {
-                                               send_channel_ready!(self, pending_msg_events, channel, channel_ready);
-                                               if channel.is_usable() {
-                                                       log_trace!(self.logger, "Sending channel_ready with private initial channel_update for our counterparty on channel {}", log_bytes!(channel.channel_id()));
-                                                       if let Ok(msg) = self.get_channel_update_for_unicast(channel) {
-                                                               pending_msg_events.push(events::MessageSendEvent::SendChannelUpdate {
-                                                                       node_id: channel.get_counterparty_node_id(),
-                                                                       msg,
-                                                               });
+                       let per_peer_state = self.per_peer_state.read().unwrap();
+                       for (_cp_id, peer_state_mutex) in per_peer_state.iter() {
+                               let mut peer_state_lock = peer_state_mutex.lock().unwrap();
+                               let peer_state = &mut *peer_state_lock;
+                               let pending_msg_events = &mut peer_state.pending_msg_events;
+                               peer_state.channel_by_id.retain(|_, channel| {
+                                       let res = f(channel);
+                                       if let Ok((channel_ready_opt, mut timed_out_pending_htlcs, announcement_sigs)) = res {
+                                               for (source, payment_hash) in timed_out_pending_htlcs.drain(..) {
+                                                       let (failure_code, data) = self.get_htlc_inbound_temp_fail_err_and_data(0x1000|14 /* expiry_too_soon */, &channel);
+                                                       timed_out_htlcs.push((source, payment_hash, HTLCFailReason::reason(failure_code, data),
+                                                               HTLCDestination::NextHopChannel { node_id: Some(channel.get_counterparty_node_id()), channel_id: channel.channel_id() }));
+                                               }
+                                               if let Some(channel_ready) = channel_ready_opt {
+                                                       send_channel_ready!(self, pending_msg_events, channel, channel_ready);
+                                                       if channel.is_usable() {
+                                                               log_trace!(self.logger, "Sending channel_ready with private initial channel_update for our counterparty on channel {}", log_bytes!(channel.channel_id()));
+                                                               if let Ok(msg) = self.get_channel_update_for_unicast(channel) {
+                                                                       pending_msg_events.push(events::MessageSendEvent::SendChannelUpdate {
+                                                                               node_id: channel.get_counterparty_node_id(),
+                                                                               msg,
+                                                                       });
+                                                               }
+                                                       } else {
+                                                               log_trace!(self.logger, "Sending channel_ready WITHOUT channel_update for {}", log_bytes!(channel.channel_id()));
                                                        }
-                                               } else {
-                                                       log_trace!(self.logger, "Sending channel_ready WITHOUT channel_update for {}", log_bytes!(channel.channel_id()));
                                                }
-                                       }
 
-                                       emit_channel_ready_event!(self, channel);
+                                               emit_channel_ready_event!(self, channel);
 
-                                       if let Some(announcement_sigs) = announcement_sigs {
-                                               log_trace!(self.logger, "Sending announcement_signatures for channel {}", log_bytes!(channel.channel_id()));
-                                               pending_msg_events.push(events::MessageSendEvent::SendAnnouncementSignatures {
-                                                       node_id: channel.get_counterparty_node_id(),
-                                                       msg: announcement_sigs,
-                                               });
-                                               if let Some(height) = height_opt {
-                                                       if let Some(announcement) = channel.get_signed_channel_announcement(self.get_our_node_id(), self.genesis_hash, height) {
-                                                               pending_msg_events.push(events::MessageSendEvent::BroadcastChannelAnnouncement {
-                                                                       msg: announcement,
-                                                                       // Note that announcement_signatures fails if the channel cannot be announced,
-                                                                       // so get_channel_update_for_broadcast will never fail by the time we get here.
-                                                                       update_msg: self.get_channel_update_for_broadcast(channel).unwrap(),
-                                                               });
+                                               if let Some(announcement_sigs) = announcement_sigs {
+                                                       log_trace!(self.logger, "Sending announcement_signatures for channel {}", log_bytes!(channel.channel_id()));
+                                                       pending_msg_events.push(events::MessageSendEvent::SendAnnouncementSignatures {
+                                                               node_id: channel.get_counterparty_node_id(),
+                                                               msg: announcement_sigs,
+                                                       });
+                                                       if let Some(height) = height_opt {
+                                                               if let Some(announcement) = channel.get_signed_channel_announcement(self.get_our_node_id(), self.genesis_hash, height) {
+                                                                       pending_msg_events.push(events::MessageSendEvent::BroadcastChannelAnnouncement {
+                                                                               msg: announcement,
+                                                                               // Note that announcement_signatures fails if the channel cannot be announced,
+                                                                               // so get_channel_update_for_broadcast will never fail by the time we get here.
+                                                                               update_msg: self.get_channel_update_for_broadcast(channel).unwrap(),
+                                                                       });
+                                                               }
                                                        }
                                                }
-                                       }
-                                       if channel.is_our_channel_ready() {
-                                               if let Some(real_scid) = channel.get_short_channel_id() {
-                                                       // If we sent a 0conf channel_ready, and now have an SCID, we add it
-                                                       // to the short_to_chan_info map here. Note that we check whether we
-                                                       // can relay using the real SCID at relay-time (i.e.
-                                                       // enforce option_scid_alias then), and if the funding tx is ever
-                                                       // un-confirmed we force-close the channel, ensuring short_to_chan_info
-                                                       // is always consistent.
-                                                       let mut short_to_chan_info = self.short_to_chan_info.write().unwrap();
-                                                       let scid_insert = short_to_chan_info.insert(real_scid, (channel.get_counterparty_node_id(), channel.channel_id()));
-                                                       assert!(scid_insert.is_none() || scid_insert.unwrap() == (channel.get_counterparty_node_id(), channel.channel_id()),
-                                                               "SCIDs should never collide - ensure you weren't behind by a full {} blocks when creating channels",
-                                                               fake_scid::MAX_SCID_BLOCKS_FROM_NOW);
+                                               if channel.is_our_channel_ready() {
+                                                       if let Some(real_scid) = channel.get_short_channel_id() {
+                                                               // If we sent a 0conf channel_ready, and now have an SCID, we add it
+                                                               // to the short_to_chan_info map here. Note that we check whether we
+                                                               // can relay using the real SCID at relay-time (i.e.
+                                                               // enforce option_scid_alias then), and if the funding tx is ever
+                                                               // un-confirmed we force-close the channel, ensuring short_to_chan_info
+                                                               // is always consistent.
+                                                               let mut short_to_chan_info = self.short_to_chan_info.write().unwrap();
+                                                               let scid_insert = short_to_chan_info.insert(real_scid, (channel.get_counterparty_node_id(), channel.channel_id()));
+                                                               assert!(scid_insert.is_none() || scid_insert.unwrap() == (channel.get_counterparty_node_id(), channel.channel_id()),
+                                                                       "SCIDs should never collide - ensure you weren't behind by a full {} blocks when creating channels",
+                                                                       fake_scid::MAX_SCID_BLOCKS_FROM_NOW);
+                                                       }
                                                }
-                                       }
-                               } else if let Err(reason) = res {
-                                       update_maps_on_chan_removal!(self, channel);
-                                       // It looks like our counterparty went on-chain or funding transaction was
-                                       // reorged out of the main chain. Close the channel.
-                                       failed_channels.push(channel.force_shutdown(true));
-                                       if let Ok(update) = self.get_channel_update_for_broadcast(&channel) {
-                                               pending_msg_events.push(events::MessageSendEvent::BroadcastChannelUpdate {
-                                                       msg: update
+                                       } else if let Err(reason) = res {
+                                               update_maps_on_chan_removal!(self, channel);
+                                               // It looks like our counterparty went on-chain or funding transaction was
+                                               // reorged out of the main chain. Close the channel.
+                                               failed_channels.push(channel.force_shutdown(true));
+                                               if let Ok(update) = self.get_channel_update_for_broadcast(&channel) {
+                                                       pending_msg_events.push(events::MessageSendEvent::BroadcastChannelUpdate {
+                                                               msg: update
+                                                       });
+                                               }
+                                               let reason_message = format!("{}", reason);
+                                               self.issue_channel_close_events(channel, reason);
+                                               pending_msg_events.push(events::MessageSendEvent::HandleError {
+                                                       node_id: channel.get_counterparty_node_id(),
+                                                       action: msgs::ErrorAction::SendErrorMessage { msg: msgs::ErrorMessage {
+                                                               channel_id: channel.channel_id(),
+                                                               data: reason_message,
+                                                       } },
                                                });
+                                               return false;
                                        }
-                                       let reason_message = format!("{}", reason);
-                                       self.issue_channel_close_events(channel, reason);
-                                       pending_msg_events.push(events::MessageSendEvent::HandleError {
-                                               node_id: channel.get_counterparty_node_id(),
-                                               action: msgs::ErrorAction::SendErrorMessage { msg: msgs::ErrorMessage {
-                                                       channel_id: channel.channel_id(),
-                                                       data: reason_message,
-                                               } },
-                                       });
-                                       return false;
-                               }
-                               true
-                       });
+                                       true
+                               });
+                       }
                }
 
                if let Some(height) = height_opt {
@@ -5663,13 +5978,15 @@ where
        }
 }
 
-impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref >
-       ChannelMessageHandler for ChannelManager<M, T, K, F, L>
-       where M::Target: chain::Watch<<K::Target as SignerProvider>::Signer>,
-        T::Target: BroadcasterInterface,
-        K::Target: KeysInterface,
-        F::Target: FeeEstimator,
-        L::Target: Logger,
+impl<M: Deref, T: Deref, K: Deref, F: Deref, R: Deref, L: Deref>
+       ChannelMessageHandler for ChannelManager<M, T, K, F, R, L>
+where
+       M::Target: chain::Watch<<K::Target as SignerProvider>::Signer>,
+       T::Target: BroadcasterInterface,
+       K::Target: KeysInterface,
+       F::Target: FeeEstimator,
+       R::Target: Router,
+       L::Target: Logger,
 {
        fn handle_open_channel(&self, counterparty_node_id: &PublicKey, their_features: InitFeatures, msg: &msgs::OpenChannel) {
                let _persistence_guard = PersistenceNotifierGuard::notify_on_drop(&self.total_consistency_lock, &self.persistence_notifier);
@@ -5765,14 +6082,16 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref >
                let _persistence_guard = PersistenceNotifierGuard::notify_on_drop(&self.total_consistency_lock, &self.persistence_notifier);
                let mut failed_channels = Vec::new();
                let mut no_channels_remain = true;
+               let mut channel_state = self.channel_state.lock().unwrap();
+               let mut per_peer_state = self.per_peer_state.write().unwrap();
                {
-                       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;
                        log_debug!(self.logger, "Marking channels with {} disconnected and generating channel_updates. We believe we {} make future connections to this peer.",
                                log_pubkey!(counterparty_node_id), if no_connection_possible { "cannot" } else { "can" });
-                       channel_state.by_id.retain(|_, chan| {
-                               if chan.get_counterparty_node_id() == *counterparty_node_id {
+                       if let Some(peer_state_mutex) = per_peer_state.get(counterparty_node_id) {
+                               let mut peer_state_lock = peer_state_mutex.lock().unwrap();
+                               let peer_state = &mut *peer_state_lock;
+                               let pending_msg_events = &mut peer_state.pending_msg_events;
+                               peer_state.channel_by_id.retain(|_, chan| {
                                        chan.remove_uncommitted_htlcs_and_mark_paused(&self.logger);
                                        if chan.is_shutdown() {
                                                update_maps_on_chan_removal!(self, chan);
@@ -5781,37 +6100,39 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref >
                                        } else {
                                                no_channels_remain = false;
                                        }
-                               }
-                               true
-                       });
-                       pending_msg_events.retain(|msg| {
-                               match msg {
-                                       &events::MessageSendEvent::SendAcceptChannel { ref node_id, .. } => node_id != counterparty_node_id,
-                                       &events::MessageSendEvent::SendOpenChannel { ref node_id, .. } => node_id != counterparty_node_id,
-                                       &events::MessageSendEvent::SendFundingCreated { ref node_id, .. } => node_id != counterparty_node_id,
-                                       &events::MessageSendEvent::SendFundingSigned { ref node_id, .. } => node_id != counterparty_node_id,
-                                       &events::MessageSendEvent::SendChannelReady { ref node_id, .. } => node_id != counterparty_node_id,
-                                       &events::MessageSendEvent::SendAnnouncementSignatures { ref node_id, .. } => node_id != counterparty_node_id,
-                                       &events::MessageSendEvent::UpdateHTLCs { ref node_id, .. } => node_id != counterparty_node_id,
-                                       &events::MessageSendEvent::SendRevokeAndACK { ref node_id, .. } => node_id != counterparty_node_id,
-                                       &events::MessageSendEvent::SendClosingSigned { ref node_id, .. } => node_id != counterparty_node_id,
-                                       &events::MessageSendEvent::SendShutdown { ref node_id, .. } => node_id != counterparty_node_id,
-                                       &events::MessageSendEvent::SendChannelReestablish { ref node_id, .. } => node_id != counterparty_node_id,
-                                       &events::MessageSendEvent::SendChannelAnnouncement { ref node_id, .. } => node_id != counterparty_node_id,
-                                       &events::MessageSendEvent::BroadcastChannelAnnouncement { .. } => true,
-                                       &events::MessageSendEvent::BroadcastChannelUpdate { .. } => true,
-                                       &events::MessageSendEvent::SendChannelUpdate { ref node_id, .. } => node_id != counterparty_node_id,
-                                       &events::MessageSendEvent::HandleError { ref node_id, .. } => node_id != counterparty_node_id,
-                                       &events::MessageSendEvent::SendChannelRangeQuery { .. } => false,
-                                       &events::MessageSendEvent::SendShortIdsQuery { .. } => false,
-                                       &events::MessageSendEvent::SendReplyChannelRange { .. } => false,
-                                       &events::MessageSendEvent::SendGossipTimestampFilter { .. } => false,
-                               }
-                       });
+                                       true
+                               });
+                               pending_msg_events.retain(|msg| {
+                                       match msg {
+                                               &events::MessageSendEvent::SendAcceptChannel { .. } => false,
+                                               &events::MessageSendEvent::SendOpenChannel { .. } => false,
+                                               &events::MessageSendEvent::SendFundingCreated { .. } => false,
+                                               &events::MessageSendEvent::SendFundingSigned { .. } => false,
+                                               &events::MessageSendEvent::SendChannelReady { .. } => false,
+                                               &events::MessageSendEvent::SendAnnouncementSignatures { .. } => false,
+                                               &events::MessageSendEvent::UpdateHTLCs { .. } => false,
+                                               &events::MessageSendEvent::SendRevokeAndACK { .. } => false,
+                                               &events::MessageSendEvent::SendClosingSigned { .. } => false,
+                                               &events::MessageSendEvent::SendShutdown { .. } => false,
+                                               &events::MessageSendEvent::SendChannelReestablish { .. } => false,
+                                               &events::MessageSendEvent::SendChannelAnnouncement { .. } => false,
+                                               &events::MessageSendEvent::BroadcastChannelAnnouncement { .. } => true,
+                                               &events::MessageSendEvent::BroadcastChannelUpdate { .. } => true,
+                                               &events::MessageSendEvent::SendChannelUpdate { .. } => false,
+                                               &events::MessageSendEvent::HandleError { .. } => false,
+                                               &events::MessageSendEvent::SendChannelRangeQuery { .. } => false,
+                                               &events::MessageSendEvent::SendShortIdsQuery { .. } => false,
+                                               &events::MessageSendEvent::SendReplyChannelRange { .. } => false,
+                                               &events::MessageSendEvent::SendGossipTimestampFilter { .. } => false,
+                                       }
+                               });
+                       }
+                       mem::drop(channel_state);
                }
                if no_channels_remain {
-                       self.per_peer_state.write().unwrap().remove(counterparty_node_id);
+                       per_peer_state.remove(counterparty_node_id);
                }
+               mem::drop(per_peer_state);
 
                for failure in failed_channels.drain(..) {
                        self.finish_force_close_channel(failure);
@@ -5833,7 +6154,9 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref >
                        match peer_state_lock.entry(counterparty_node_id.clone()) {
                                hash_map::Entry::Vacant(e) => {
                                        e.insert(Mutex::new(PeerState {
+                                               channel_by_id: HashMap::new(),
                                                latest_features: init_msg.features.clone(),
+                                               pending_msg_events: Vec::new(),
                                        }));
                                },
                                hash_map::Entry::Occupied(e) => {
@@ -5844,35 +6167,41 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref >
 
                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;
-               channel_state.by_id.retain(|_, chan| {
-                       let retain = if chan.get_counterparty_node_id() == *counterparty_node_id {
-                               if !chan.have_received_message() {
-                                       // If we created this (outbound) channel while we were disconnected from the
-                                       // peer we probably failed to send the open_channel message, which is now
-                                       // lost. We can't have had anything pending related to this channel, so we just
-                                       // drop it.
-                                       false
-                               } else {
-                                       pending_msg_events.push(events::MessageSendEvent::SendChannelReestablish {
-                                               node_id: chan.get_counterparty_node_id(),
-                                               msg: chan.get_channel_reestablish(&self.logger),
-                                       });
-                                       true
-                               }
-                       } else { true };
-                       if retain && chan.get_counterparty_node_id() != *counterparty_node_id {
-                               if let Some(msg) = chan.get_signed_channel_announcement(self.get_our_node_id(), self.genesis_hash.clone(), self.best_block.read().unwrap().height()) {
-                                       if let Ok(update_msg) = self.get_channel_update_for_broadcast(chan) {
-                                               pending_msg_events.push(events::MessageSendEvent::SendChannelAnnouncement {
-                                                       node_id: *counterparty_node_id,
-                                                       msg, update_msg,
+               let per_peer_state = self.per_peer_state.read().unwrap();
+
+               for (_cp_id, peer_state_mutex) in per_peer_state.iter() {
+                       let mut peer_state_lock = peer_state_mutex.lock().unwrap();
+                       let peer_state = &mut *peer_state_lock;
+                       let pending_msg_events = &mut peer_state.pending_msg_events;
+                       peer_state.channel_by_id.retain(|_, chan| {
+                               let retain = if chan.get_counterparty_node_id() == *counterparty_node_id {
+                                       if !chan.have_received_message() {
+                                               // If we created this (outbound) channel while we were disconnected from the
+                                               // peer we probably failed to send the open_channel message, which is now
+                                               // lost. We can't have had anything pending related to this channel, so we just
+                                               // drop it.
+                                               false
+                                       } else {
+                                               pending_msg_events.push(events::MessageSendEvent::SendChannelReestablish {
+                                                       node_id: chan.get_counterparty_node_id(),
+                                                       msg: chan.get_channel_reestablish(&self.logger),
                                                });
+                                               true
+                                       }
+                               } else { true };
+                               if retain && chan.get_counterparty_node_id() != *counterparty_node_id {
+                                       if let Some(msg) = chan.get_signed_channel_announcement(self.get_our_node_id(), self.genesis_hash.clone(), self.best_block.read().unwrap().height()) {
+                                               if let Ok(update_msg) = self.get_channel_update_for_broadcast(chan) {
+                                                       pending_msg_events.push(events::MessageSendEvent::SendChannelAnnouncement {
+                                                               node_id: *counterparty_node_id,
+                                                               msg, update_msg,
+                                                       });
+                                               }
                                        }
                                }
-                       }
-                       retain
-               });
+                               retain
+                       });
+               }
                //TODO: Also re-broadcast announcement_signatures
                Ok(())
        }
@@ -5881,22 +6210,30 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref >
                let _persistence_guard = PersistenceNotifierGuard::notify_on_drop(&self.total_consistency_lock, &self.persistence_notifier);
 
                if msg.channel_id == [0; 32] {
-                       for chan in self.list_channels() {
-                               if chan.counterparty.node_id == *counterparty_node_id {
-                                       // Untrusted messages from peer, we throw away the error if id points to a non-existent channel
-                                       let _ = self.force_close_channel_with_peer(&chan.channel_id, counterparty_node_id, Some(&msg.data), true);
-                               }
+                       let channel_ids: Vec<[u8; 32]> = {
+                               let per_peer_state = self.per_peer_state.read().unwrap();
+                               let peer_state_mutex_opt = per_peer_state.get(counterparty_node_id);
+                               if let None = peer_state_mutex_opt { return; }
+                               let mut peer_state_lock = peer_state_mutex_opt.unwrap().lock().unwrap();
+                               let peer_state = &mut *peer_state_lock;
+                               peer_state.channel_by_id.keys().cloned().collect()
+                       };
+                       for channel_id in channel_ids {
+                               // Untrusted messages from peer, we throw away the error if id points to a non-existent channel
+                               let _ = self.force_close_channel_with_peer(&channel_id, counterparty_node_id, Some(&msg.data), true);
                        }
                } else {
                        {
                                // First check if we can advance the channel type and try again.
                                let mut channel_state = self.channel_state.lock().unwrap();
-                               if let Some(chan) = channel_state.by_id.get_mut(&msg.channel_id) {
-                                       if chan.get_counterparty_node_id() != *counterparty_node_id {
-                                               return;
-                                       }
+                               let per_peer_state = self.per_peer_state.read().unwrap();
+                               let peer_state_mutex_opt = per_peer_state.get(counterparty_node_id);
+                               if let None = peer_state_mutex_opt { return; }
+                               let mut peer_state_lock = peer_state_mutex_opt.unwrap().lock().unwrap();
+                               let peer_state = &mut *peer_state_lock;
+                               if let Some(chan) = peer_state.channel_by_id.get_mut(&msg.channel_id) {
                                        if let Ok(msg) = chan.maybe_handle_error_without_close(self.genesis_hash) {
-                                               channel_state.pending_msg_events.push(events::MessageSendEvent::SendOpenChannel {
+                                               peer_state.pending_msg_events.push(events::MessageSendEvent::SendOpenChannel {
                                                        node_id: *counterparty_node_id,
                                                        msg,
                                                });
@@ -6350,12 +6687,14 @@ impl_writeable_tlv_based!(PendingInboundPayment, {
        (8, min_value_msat, required),
 });
 
-impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> Writeable for ChannelManager<M, T, K, F, L>
-       where M::Target: chain::Watch<<K::Target as SignerProvider>::Signer>,
-        T::Target: BroadcasterInterface,
-        K::Target: KeysInterface,
-        F::Target: FeeEstimator,
-        L::Target: Logger,
+impl<M: Deref, T: Deref, K: Deref, F: Deref, R: Deref, L: Deref> Writeable for ChannelManager<M, T, K, F, R, L>
+where
+       M::Target: chain::Watch<<K::Target as SignerProvider>::Signer>,
+       T::Target: BroadcasterInterface,
+       K::Target: KeysInterface,
+       F::Target: FeeEstimator,
+       R::Target: Router,
+       L::Target: Logger,
 {
        fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
                let _consistency_lock = self.total_consistency_lock.write().unwrap();
@@ -6370,19 +6709,29 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> Writeable for ChannelMana
                }
 
                {
-                       // Take `channel_state` lock temporarily to avoid creating a lock order that requires
-                       // that the `forward_htlcs` lock is taken after `channel_state`
-                       let channel_state = self.channel_state.lock().unwrap();
+                       let per_peer_state = self.per_peer_state.read().unwrap();
                        let mut unfunded_channels = 0;
-                       for (_, channel) in channel_state.by_id.iter() {
-                               if !channel.is_funding_initiated() {
-                                       unfunded_channels += 1;
+                       let mut number_of_channels = 0;
+                       for (_, peer_state_mutex) in per_peer_state.iter() {
+                               let mut peer_state_lock = peer_state_mutex.lock().unwrap();
+                               let peer_state = &mut *peer_state_lock;
+                               number_of_channels += peer_state.channel_by_id.len();
+                               for (_, channel) in peer_state.channel_by_id.iter() {
+                                       if !channel.is_funding_initiated() {
+                                               unfunded_channels += 1;
+                                       }
                                }
                        }
-                       ((channel_state.by_id.len() - unfunded_channels) as u64).write(writer)?;
-                       for (_, channel) in channel_state.by_id.iter() {
-                               if channel.is_funding_initiated() {
-                                       channel.write(writer)?;
+
+                       ((number_of_channels - unfunded_channels) as u64).write(writer)?;
+
+                       for (_, peer_state_mutex) in per_peer_state.iter() {
+                               let mut peer_state_lock = peer_state_mutex.lock().unwrap();
+                               let peer_state = &mut *peer_state_lock;
+                               for (_, channel) in peer_state.channel_by_id.iter() {
+                                       if channel.is_funding_initiated() {
+                                               channel.write(writer)?;
+                                       }
                                }
                        }
                }
@@ -6547,12 +6896,14 @@ impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> Writeable for ChannelMana
 /// which you've already broadcasted the transaction.
 ///
 /// [`ChainMonitor`]: crate::chain::chainmonitor::ChainMonitor
-pub struct ChannelManagerReadArgs<'a, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref>
-       where M::Target: chain::Watch<<K::Target as SignerProvider>::Signer>,
-        T::Target: BroadcasterInterface,
-        K::Target: KeysInterface,
-        F::Target: FeeEstimator,
-        L::Target: Logger,
+pub struct ChannelManagerReadArgs<'a, M: Deref, T: Deref, K: Deref, F: Deref, R: Deref, L: Deref>
+where
+       M::Target: chain::Watch<<K::Target as SignerProvider>::Signer>,
+       T::Target: BroadcasterInterface,
+       K::Target: KeysInterface,
+       F::Target: FeeEstimator,
+       R::Target: Router,
+       L::Target: Logger,
 {
        /// The keys provider which will give us relevant keys. Some keys will be loaded during
        /// deserialization and KeysInterface::read_chan_signer will be used to read per-Channel
@@ -6574,6 +6925,11 @@ pub struct ChannelManagerReadArgs<'a, M: Deref, T: Deref, K: Deref, F: Deref, L:
        /// used to broadcast the latest local commitment transactions of channels which must be
        /// force-closed during deserialization.
        pub tx_broadcaster: T,
+       /// The router which will be used in the ChannelManager in the future for finding routes
+       /// on-the-fly for trampoline payments. Absent in private nodes that don't support forwarding.
+       ///
+       /// No calls to the router will be made during deserialization.
+       pub router: R,
        /// The Logger for use in the ChannelManager and which may be used to log information during
        /// deserialization.
        pub logger: L,
@@ -6596,21 +6952,23 @@ pub struct ChannelManagerReadArgs<'a, M: Deref, T: Deref, K: Deref, F: Deref, L:
        pub channel_monitors: HashMap<OutPoint, &'a mut ChannelMonitor<<K::Target as SignerProvider>::Signer>>,
 }
 
-impl<'a, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref>
-               ChannelManagerReadArgs<'a, M, T, K, F, L>
-       where M::Target: chain::Watch<<K::Target as SignerProvider>::Signer>,
-               T::Target: BroadcasterInterface,
-               K::Target: KeysInterface,
-               F::Target: FeeEstimator,
-               L::Target: Logger,
-       {
+impl<'a, M: Deref, T: Deref, K: Deref, F: Deref, R: Deref, L: Deref>
+               ChannelManagerReadArgs<'a, M, T, K, F, R, L>
+where
+       M::Target: chain::Watch<<K::Target as SignerProvider>::Signer>,
+       T::Target: BroadcasterInterface,
+       K::Target: KeysInterface,
+       F::Target: FeeEstimator,
+       R::Target: Router,
+       L::Target: Logger,
+{
        /// Simple utility function to create a ChannelManagerReadArgs which creates the monitor
        /// HashMap for you. This is primarily useful for C bindings where it is not practical to
        /// populate a HashMap directly from C.
-       pub fn new(keys_manager: K, fee_estimator: F, chain_monitor: M, tx_broadcaster: T, logger: L, default_config: UserConfig,
+       pub fn new(keys_manager: K, fee_estimator: F, chain_monitor: M, tx_broadcaster: T, router: R, logger: L, default_config: UserConfig,
                        mut channel_monitors: Vec<&'a mut ChannelMonitor<<K::Target as SignerProvider>::Signer>>) -> Self {
                Self {
-                       keys_manager, fee_estimator, chain_monitor, tx_broadcaster, logger, default_config,
+                       keys_manager, fee_estimator, chain_monitor, tx_broadcaster, router, logger, default_config,
                        channel_monitors: channel_monitors.drain(..).map(|monitor| { (monitor.get_funding_txo().0, monitor) }).collect()
                }
        }
@@ -6618,29 +6976,33 @@ impl<'a, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref>
 
 // Implement ReadableArgs for an Arc'd ChannelManager to make it a bit easier to work with the
 // SipmleArcChannelManager type:
-impl<'a, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref>
-       ReadableArgs<ChannelManagerReadArgs<'a, M, T, K, F, L>> for (BlockHash, Arc<ChannelManager<M, T, K, F, L>>)
-       where M::Target: chain::Watch<<K::Target as SignerProvider>::Signer>,
-        T::Target: BroadcasterInterface,
-        K::Target: KeysInterface,
-        F::Target: FeeEstimator,
-        L::Target: Logger,
+impl<'a, M: Deref, T: Deref, K: Deref, F: Deref, R: Deref, L: Deref>
+       ReadableArgs<ChannelManagerReadArgs<'a, M, T, K, F, R, L>> for (BlockHash, Arc<ChannelManager<M, T, K, F, R, L>>)
+where
+       M::Target: chain::Watch<<K::Target as SignerProvider>::Signer>,
+       T::Target: BroadcasterInterface,
+       K::Target: KeysInterface,
+       F::Target: FeeEstimator,
+       R::Target: Router,
+       L::Target: Logger,
 {
-       fn read<R: io::Read>(reader: &mut R, args: ChannelManagerReadArgs<'a, M, T, K, F, L>) -> Result<Self, DecodeError> {
-               let (blockhash, chan_manager) = <(BlockHash, ChannelManager<M, T, K, F, L>)>::read(reader, args)?;
+       fn read<Reader: io::Read>(reader: &mut Reader, args: ChannelManagerReadArgs<'a, M, T, K, F, R, L>) -> Result<Self, DecodeError> {
+               let (blockhash, chan_manager) = <(BlockHash, ChannelManager<M, T, K, F, R, L>)>::read(reader, args)?;
                Ok((blockhash, Arc::new(chan_manager)))
        }
 }
 
-impl<'a, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref>
-       ReadableArgs<ChannelManagerReadArgs<'a, M, T, K, F, L>> for (BlockHash, ChannelManager<M, T, K, F, L>)
-       where M::Target: chain::Watch<<K::Target as SignerProvider>::Signer>,
-        T::Target: BroadcasterInterface,
-        K::Target: KeysInterface,
-        F::Target: FeeEstimator,
-        L::Target: Logger,
+impl<'a, M: Deref, T: Deref, K: Deref, F: Deref, R: Deref, L: Deref>
+       ReadableArgs<ChannelManagerReadArgs<'a, M, T, K, F, R, L>> for (BlockHash, ChannelManager<M, T, K, F, R, L>)
+where
+       M::Target: chain::Watch<<K::Target as SignerProvider>::Signer>,
+       T::Target: BroadcasterInterface,
+       K::Target: KeysInterface,
+       F::Target: FeeEstimator,
+       R::Target: Router,
+       L::Target: Logger,
 {
-       fn read<R: io::Read>(reader: &mut R, mut args: ChannelManagerReadArgs<'a, M, T, K, F, L>) -> Result<Self, DecodeError> {
+       fn read<Reader: io::Read>(reader: &mut Reader, mut args: ChannelManagerReadArgs<'a, M, T, K, F, R, L>) -> Result<Self, DecodeError> {
                let _ver = read_ver_prefix!(reader, SERIALIZATION_VERSION);
 
                let genesis_hash: BlockHash = Readable::read(reader)?;
@@ -6651,7 +7013,7 @@ impl<'a, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref>
 
                let channel_count: u64 = Readable::read(reader)?;
                let mut funding_txo_set = HashSet::with_capacity(cmp::min(channel_count as usize, 128));
-               let mut by_id = HashMap::with_capacity(cmp::min(channel_count as usize, 128));
+               let mut peer_channels: HashMap<PublicKey, HashMap<[u8; 32], Channel<<K::Target as SignerProvider>::Signer>>> = HashMap::with_capacity(cmp::min(channel_count as usize, 128));
                let mut id_to_peer = HashMap::with_capacity(cmp::min(channel_count as usize, 128));
                let mut short_to_chan_info = HashMap::with_capacity(cmp::min(channel_count as usize, 128));
                let mut channel_closures = Vec::new();
@@ -6717,7 +7079,17 @@ impl<'a, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref>
                                        if channel.is_funding_initiated() {
                                                id_to_peer.insert(channel.channel_id(), channel.get_counterparty_node_id());
                                        }
-                                       by_id.insert(channel.channel_id(), channel);
+                                       match peer_channels.entry(channel.get_counterparty_node_id()) {
+                                               hash_map::Entry::Occupied(mut entry) => {
+                                                       let by_id_map = entry.get_mut();
+                                                       by_id_map.insert(channel.channel_id(), channel);
+                                               },
+                                               hash_map::Entry::Vacant(entry) => {
+                                                       let mut by_id_map = HashMap::new();
+                                                       by_id_map.insert(channel.channel_id(), channel);
+                                                       entry.insert(by_id_map);
+                                               }
+                                       }
                                }
                        } else if channel.is_awaiting_initial_mon_persist() {
                                // If we were persisted and shut down while the initial ChannelMonitor persistence
@@ -6772,11 +7144,13 @@ impl<'a, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref>
                }
 
                let peer_count: u64 = Readable::read(reader)?;
-               let mut per_peer_state = HashMap::with_capacity(cmp::min(peer_count as usize, MAX_ALLOC_SIZE/mem::size_of::<(PublicKey, Mutex<PeerState>)>()));
+               let mut per_peer_state = HashMap::with_capacity(cmp::min(peer_count as usize, MAX_ALLOC_SIZE/mem::size_of::<(PublicKey, Mutex<PeerState<<K::Target as SignerProvider>::Signer>>)>()));
                for _ in 0..peer_count {
                        let peer_pubkey = Readable::read(reader)?;
                        let peer_state = PeerState {
+                               channel_by_id: peer_channels.remove(&peer_pubkey).unwrap_or(HashMap::new()),
                                latest_features: Readable::read(reader)?,
+                               pending_msg_events: Vec::new(),
                        };
                        per_peer_state.insert(peer_pubkey, Mutex::new(peer_state));
                }
@@ -6868,7 +7242,7 @@ impl<'a, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref>
                        // We only rebuild the pending payments map if we were most recently serialized by
                        // 0.0.102+
                        for (_, monitor) in args.channel_monitors.iter() {
-                               if by_id.get(&monitor.get_funding_txo().0.to_channel_id()).is_none() {
+                               if id_to_peer.get(&monitor.get_funding_txo().0.to_channel_id()).is_none() {
                                        for (htlc_source, htlc) in monitor.get_pending_outbound_htlcs() {
                                                if let HTLCSource::OutboundRoute { payment_id, session_priv, path, payment_secret, .. } = htlc_source {
                                                        if path.is_empty() {
@@ -7016,28 +7390,32 @@ impl<'a, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref>
                }
 
                let mut outbound_scid_aliases = HashSet::new();
-               for (chan_id, chan) in by_id.iter_mut() {
-                       if chan.outbound_scid_alias() == 0 {
-                               let mut outbound_scid_alias;
-                               loop {
-                                       outbound_scid_alias = fake_scid::Namespace::OutboundAlias
-                                               .get_fake_scid(best_block_height, &genesis_hash, fake_scid_rand_bytes.as_ref().unwrap(), &args.keys_manager);
-                                       if outbound_scid_aliases.insert(outbound_scid_alias) { break; }
-                               }
-                               chan.set_outbound_scid_alias(outbound_scid_alias);
-                       } else if !outbound_scid_aliases.insert(chan.outbound_scid_alias()) {
-                               // Note that in rare cases its possible to hit this while reading an older
-                               // channel if we just happened to pick a colliding outbound alias above.
-                               log_error!(args.logger, "Got duplicate outbound SCID alias; {}", chan.outbound_scid_alias());
-                               return Err(DecodeError::InvalidValue);
-                       }
-                       if chan.is_usable() {
-                               if short_to_chan_info.insert(chan.outbound_scid_alias(), (chan.get_counterparty_node_id(), *chan_id)).is_some() {
+               for (_peer_node_id, peer_state_mutex) in per_peer_state.iter_mut() {
+                       let mut peer_state_lock = peer_state_mutex.lock().unwrap();
+                       let peer_state = &mut *peer_state_lock;
+                       for (chan_id, chan) in peer_state.channel_by_id.iter_mut() {
+                               if chan.outbound_scid_alias() == 0 {
+                                       let mut outbound_scid_alias;
+                                       loop {
+                                               outbound_scid_alias = fake_scid::Namespace::OutboundAlias
+                                                       .get_fake_scid(best_block_height, &genesis_hash, fake_scid_rand_bytes.as_ref().unwrap(), &args.keys_manager);
+                                               if outbound_scid_aliases.insert(outbound_scid_alias) { break; }
+                                       }
+                                       chan.set_outbound_scid_alias(outbound_scid_alias);
+                               } else if !outbound_scid_aliases.insert(chan.outbound_scid_alias()) {
                                        // Note that in rare cases its possible to hit this while reading an older
                                        // channel if we just happened to pick a colliding outbound alias above.
                                        log_error!(args.logger, "Got duplicate outbound SCID alias; {}", chan.outbound_scid_alias());
                                        return Err(DecodeError::InvalidValue);
                                }
+                               if chan.is_usable() {
+                                       if short_to_chan_info.insert(chan.outbound_scid_alias(), (chan.get_counterparty_node_id(), *chan_id)).is_some() {
+                                               // Note that in rare cases its possible to hit this while reading an older
+                                               // channel if we just happened to pick a colliding outbound alias above.
+                                               log_error!(args.logger, "Got duplicate outbound SCID alias; {}", chan.outbound_scid_alias());
+                                               return Err(DecodeError::InvalidValue);
+                                       }
+                               }
                        }
                }
 
@@ -7074,8 +7452,13 @@ impl<'a, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref>
                                                // without the new monitor persisted - we'll end up right back here on
                                                // restart.
                                                let previous_channel_id = claimable_htlc.prev_hop.outpoint.to_channel_id();
-                                               if let Some(channel) = by_id.get_mut(&previous_channel_id) {
-                                                       channel.claim_htlc_while_disconnected_dropping_mon_update(claimable_htlc.prev_hop.htlc_id, payment_preimage, &args.logger);
+                                               if let Some(peer_node_id) = id_to_peer.get(&previous_channel_id){
+                                                       let peer_state_mutex = per_peer_state.get(peer_node_id).unwrap();
+                                                       let mut peer_state_lock = peer_state_mutex.lock().unwrap();
+                                                       let peer_state = &mut *peer_state_lock;
+                                                       if let Some(channel) = peer_state.channel_by_id.get_mut(&previous_channel_id) {
+                                                               channel.claim_htlc_while_disconnected_dropping_mon_update(claimable_htlc.prev_hop.htlc_id, payment_preimage, &args.logger);
+                                                       }
                                                }
                                                if let Some(previous_hop_monitor) = args.channel_monitors.get(&claimable_htlc.prev_hop.outpoint) {
                                                        previous_hop_monitor.provide_payment_preimage(&payment_hash, &payment_preimage, &args.tx_broadcaster, &bounded_fee_estimator, &args.logger);
@@ -7096,12 +7479,11 @@ impl<'a, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref>
                        fee_estimator: bounded_fee_estimator,
                        chain_monitor: args.chain_monitor,
                        tx_broadcaster: args.tx_broadcaster,
+                       router: args.router,
 
                        best_block: RwLock::new(BestBlock::new(best_block_hash, best_block_height)),
 
                        channel_state: Mutex::new(ChannelHolder {
-                               by_id,
-                               pending_msg_events: Vec::new(),
                        }),
                        inbound_payment_key: expanded_inbound_key,
                        pending_inbound_payments: Mutex::new(pending_inbound_payments),
@@ -7123,7 +7505,7 @@ impl<'a, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref>
 
                        highest_seen_timestamp: AtomicUsize::new(highest_seen_timestamp as usize),
 
-                       per_peer_state: RwLock::new(per_peer_state),
+                       per_peer_state: FairRwLock::new(per_peer_state),
 
                        pending_events: Mutex::new(pending_events_read),
                        pending_background_events: Mutex::new(pending_background_events_read),
@@ -7153,17 +7535,24 @@ impl<'a, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref>
 mod tests {
        use bitcoin::hashes::Hash;
        use bitcoin::hashes::sha256::Hash as Sha256;
+       use bitcoin::hashes::hex::FromHex;
+       use bitcoin::secp256k1::{PublicKey, Secp256k1, SecretKey};
+       use bitcoin::secp256k1::ecdsa::Signature;
+       use bitcoin::secp256k1::ffi::Signature as FFISignature;
+       use bitcoin::blockdata::script::Script;
+       use bitcoin::Txid;
        use core::time::Duration;
        use core::sync::atomic::Ordering;
        use crate::ln::{PaymentPreimage, PaymentHash, PaymentSecret};
-       use crate::ln::channelmanager::{self, inbound_payment, PaymentId, PaymentSendFailure};
+       use crate::ln::channelmanager::{self, inbound_payment, PaymentId, PaymentSendFailure, InterceptId};
        use crate::ln::functional_test_utils::*;
        use crate::ln::msgs;
-       use crate::ln::msgs::ChannelMessageHandler;
+       use crate::ln::msgs::{ChannelMessageHandler, OptionalField};
        use crate::routing::router::{PaymentParameters, RouteParameters, find_route};
        use crate::util::errors::APIError;
        use crate::util::events::{Event, HTLCDestination, MessageSendEvent, MessageSendEventsProvider, ClosureReason};
        use crate::util::test_utils;
+       use crate::util::config::ChannelConfig;
        use crate::chain::keysinterface::{EntropySource, KeysInterface};
 
        #[test]
@@ -7481,7 +7870,7 @@ mod tests {
                        final_value_msat: 10_000,
                        final_cltv_expiry_delta: 40,
                };
-               let network_graph = nodes[0].network_graph;
+               let network_graph = nodes[0].network_graph.clone();
                let first_hops = nodes[0].node.list_usable_channels();
                let scorer = test_utils::TestScorer::with_penalty(0);
                let random_seed_bytes = chanmon_cfgs[1].keys_manager.get_secure_random_bytes();
@@ -7526,7 +7915,7 @@ mod tests {
                        final_value_msat: 10_000,
                        final_cltv_expiry_delta: 40,
                };
-               let network_graph = nodes[0].network_graph;
+               let network_graph = nodes[0].network_graph.clone();
                let first_hops = nodes[0].node.list_usable_channels();
                let scorer = test_utils::TestScorer::with_penalty(0);
                let random_seed_bytes = chanmon_cfgs[1].keys_manager.get_secure_random_bytes();
@@ -7724,6 +8113,194 @@ mod tests {
                check_closed_event!(nodes[0], 1, ClosureReason::CooperativeClosure);
                check_closed_event!(nodes[1], 1, ClosureReason::CooperativeClosure);
        }
+
+       fn check_not_connected_to_peer_error<T>(res_err: Result<T, APIError>, expected_public_key: PublicKey) {
+               let expected_message = format!("Not connected to node: {}", expected_public_key);
+               check_api_misuse_error_message(expected_message, res_err)
+       }
+
+       fn check_unkown_peer_error<T>(res_err: Result<T, APIError>, expected_public_key: PublicKey) {
+               let expected_message = format!("Can't find a peer matching the passed counterparty node_id {}", expected_public_key);
+               check_api_misuse_error_message(expected_message, res_err)
+       }
+
+       fn check_api_misuse_error_message<T>(expected_err_message: String, res_err: Result<T, APIError>) {
+               match res_err {
+                       Err(APIError::APIMisuseError { err }) => {
+                               assert_eq!(err, expected_err_message);
+                       },
+                       Ok(_) => panic!("Unexpected Ok"),
+                       Err(_) => panic!("Unexpected Error"),
+               }
+       }
+
+       #[test]
+       fn test_api_calls_with_unkown_counterparty_node() {
+               // Tests that our API functions and message handlers that expects a `counterparty_node_id`
+               // as input, behaves as expected if the `counterparty_node_id` is an unkown peer in the
+               // `ChannelManager::per_peer_state` map.
+               let chanmon_cfg = create_chanmon_cfgs(2);
+               let node_cfg = create_node_cfgs(2, &chanmon_cfg);
+               let node_chanmgr = create_node_chanmgrs(2, &node_cfg, &[None, None]);
+               let nodes = create_network(2, &node_cfg, &node_chanmgr);
+
+               // Boilerplate code to produce `open_channel` and `accept_channel` msgs more densly than
+               // creating dummy ones.
+               nodes[0].node.create_channel(nodes[1].node.get_our_node_id(), 1_000_000, 500_000_000, 42, None).unwrap();
+               let open_channel_msg = get_event_msg!(nodes[0], MessageSendEvent::SendOpenChannel, nodes[1].node.get_our_node_id());
+               nodes[1].node.handle_open_channel(&nodes[0].node.get_our_node_id(), channelmanager::provided_init_features(), &open_channel_msg);
+               let accept_channel_msg = get_event_msg!(nodes[1], MessageSendEvent::SendAcceptChannel, nodes[0].node.get_our_node_id());
+
+               // Dummy values
+               let channel_id = [4; 32];
+               let signature = Signature::from(unsafe { FFISignature::new() });
+               let unkown_public_key = PublicKey::from_secret_key(&Secp256k1::signing_only(), &SecretKey::from_slice(&[42; 32]).unwrap());
+               let intercept_id = InterceptId([0; 32]);
+
+               // Dummy msgs
+               let funding_created_msg = msgs::FundingCreated {
+                       temporary_channel_id: open_channel_msg.temporary_channel_id,
+                       funding_txid: Txid::from_hex("ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff").unwrap(),
+                       funding_output_index: 0,
+                       signature: signature,
+               };
+
+               let funding_signed_msg = msgs::FundingSigned {
+                       channel_id: channel_id,
+                       signature: signature,
+               };
+
+               let channel_ready_msg = msgs::ChannelReady {
+                       channel_id: channel_id,
+                       next_per_commitment_point: unkown_public_key,
+                       short_channel_id_alias: None,
+               };
+
+               let announcement_signatures_msg = msgs::AnnouncementSignatures {
+                       channel_id: channel_id,
+                       short_channel_id: 0,
+                       node_signature: signature,
+                       bitcoin_signature: signature,
+               };
+
+               let channel_reestablish_msg = msgs::ChannelReestablish {
+                       channel_id: channel_id,
+                       next_local_commitment_number: 0,
+                       next_remote_commitment_number: 0,
+                       data_loss_protect: OptionalField::Absent,
+               };
+
+               let closing_signed_msg = msgs::ClosingSigned {
+                       channel_id: channel_id,
+                       fee_satoshis: 1000,
+                       signature: signature,
+                       fee_range: None,
+               };
+
+               let shutdown_msg = msgs::Shutdown {
+                       channel_id: channel_id,
+                       scriptpubkey: Script::new(),
+               };
+
+               let onion_routing_packet = msgs::OnionPacket {
+                       version: 255,
+                       public_key: Ok(unkown_public_key),
+                       hop_data: [1; 20*65],
+                       hmac: [2; 32]
+               };
+
+               let update_add_htlc_msg = msgs::UpdateAddHTLC {
+                       channel_id: channel_id,
+                       htlc_id: 0,
+                       amount_msat: 1000000,
+                       payment_hash: PaymentHash([1; 32]),
+                       cltv_expiry: 821716,
+                       onion_routing_packet
+               };
+
+               let commitment_signed_msg = msgs::CommitmentSigned {
+                       channel_id: channel_id,
+                       signature: signature,
+                       htlc_signatures: Vec::new(),
+               };
+
+               let update_fee_msg = msgs::UpdateFee {
+                       channel_id: channel_id,
+                       feerate_per_kw: 1000,
+               };
+
+               let malformed_update_msg = msgs::UpdateFailMalformedHTLC{
+                       channel_id: channel_id,
+                       htlc_id: 0,
+                       sha256_of_onion: [1; 32],
+                       failure_code: 0x8000,
+               };
+
+               let fulfill_update_msg = msgs::UpdateFulfillHTLC{
+                       channel_id: channel_id,
+                       htlc_id: 0,
+                       payment_preimage: PaymentPreimage([1; 32]),
+               };
+
+               let fail_update_msg = msgs::UpdateFailHTLC{
+                       channel_id: channel_id,
+                       htlc_id: 0,
+                       reason: msgs::OnionErrorPacket { data: Vec::new()},
+               };
+
+               let revoke_and_ack_msg = msgs::RevokeAndACK {
+                       channel_id: channel_id,
+                       per_commitment_secret: [1; 32],
+                       next_per_commitment_point: unkown_public_key,
+               };
+
+               // Test the API functions and message handlers.
+               check_not_connected_to_peer_error(nodes[0].node.create_channel(unkown_public_key, 1_000_000, 500_000_000, 42, None), unkown_public_key);
+
+               nodes[1].node.handle_open_channel(&unkown_public_key, channelmanager::provided_init_features(), &open_channel_msg);
+
+               nodes[0].node.handle_accept_channel(&unkown_public_key, channelmanager::provided_init_features(), &accept_channel_msg);
+
+               check_unkown_peer_error(nodes[0].node.accept_inbound_channel(&open_channel_msg.temporary_channel_id, &unkown_public_key, 42), unkown_public_key);
+
+               nodes[1].node.handle_funding_created(&unkown_public_key, &funding_created_msg);
+
+               nodes[0].node.handle_funding_signed(&unkown_public_key, &funding_signed_msg);
+
+               nodes[0].node.handle_channel_ready(&unkown_public_key, &channel_ready_msg);
+
+               nodes[1].node.handle_announcement_signatures(&unkown_public_key, &announcement_signatures_msg);
+
+               check_unkown_peer_error(nodes[0].node.close_channel(&channel_id, &unkown_public_key), unkown_public_key);
+
+               check_unkown_peer_error(nodes[0].node.force_close_broadcasting_latest_txn(&channel_id, &unkown_public_key), unkown_public_key);
+
+               check_unkown_peer_error(nodes[0].node.force_close_without_broadcasting_txn(&channel_id, &unkown_public_key), unkown_public_key);
+
+               check_unkown_peer_error(nodes[0].node.forward_intercepted_htlc(intercept_id, &channel_id, unkown_public_key, 1_000_000), unkown_public_key);
+
+               check_unkown_peer_error(nodes[0].node.update_channel_config(&unkown_public_key, &[channel_id], &ChannelConfig::default()), unkown_public_key);
+
+               nodes[0].node.handle_shutdown(&unkown_public_key, &channelmanager::provided_init_features(), &shutdown_msg);
+
+               nodes[1].node.handle_closing_signed(&unkown_public_key, &closing_signed_msg);
+
+               nodes[0].node.handle_channel_reestablish(&unkown_public_key, &channel_reestablish_msg);
+
+               nodes[1].node.handle_update_add_htlc(&unkown_public_key, &update_add_htlc_msg);
+
+               nodes[1].node.handle_commitment_signed(&unkown_public_key, &commitment_signed_msg);
+
+               nodes[1].node.handle_update_fail_malformed_htlc(&unkown_public_key, &malformed_update_msg);
+
+               nodes[1].node.handle_update_fail_htlc(&unkown_public_key, &fail_update_msg);
+
+               nodes[1].node.handle_update_fulfill_htlc(&unkown_public_key, &fulfill_update_msg);
+
+               nodes[1].node.handle_revoke_and_ack(&unkown_public_key, &revoke_and_ack_msg);
+
+               nodes[1].node.handle_update_fee(&unkown_public_key, &update_fee_msg);
+       }
 }
 
 #[cfg(all(any(test, feature = "_test_utils"), feature = "_bench_unstable"))]
@@ -7754,7 +8331,8 @@ pub mod bench {
                                &'a test_utils::TestBroadcaster, &'a test_utils::TestFeeEstimator,
                                &'a test_utils::TestLogger, &'a P>,
                        &'a test_utils::TestBroadcaster, &'a KeysManager,
-                       &'a test_utils::TestFeeEstimator, &'a test_utils::TestLogger>,
+                       &'a test_utils::TestFeeEstimator, &'a test_utils::TestRouter<'a>,
+                       &'a test_utils::TestLogger>,
        }
 
        #[cfg(test)]
@@ -7772,15 +8350,16 @@ pub mod bench {
 
                let tx_broadcaster = test_utils::TestBroadcaster{txn_broadcasted: Mutex::new(Vec::new()), blocks: Arc::new(Mutex::new(Vec::new()))};
                let fee_estimator = test_utils::TestFeeEstimator { sat_per_kw: Mutex::new(253) };
+               let logger_a = test_utils::TestLogger::with_id("node a".to_owned());
+               let router = test_utils::TestRouter::new(Arc::new(NetworkGraph::new(genesis_hash, &logger_a)));
 
                let mut config: UserConfig = Default::default();
                config.channel_handshake_config.minimum_depth = 1;
 
-               let logger_a = test_utils::TestLogger::with_id("node a".to_owned());
                let chain_monitor_a = ChainMonitor::new(None, &tx_broadcaster, &logger_a, &fee_estimator, &persister_a);
                let seed_a = [1u8; 32];
                let keys_manager_a = KeysManager::new(&seed_a, 42, 42);
-               let node_a = ChannelManager::new(&fee_estimator, &chain_monitor_a, &tx_broadcaster, &logger_a, &keys_manager_a, config.clone(), ChainParameters {
+               let node_a = ChannelManager::new(&fee_estimator, &chain_monitor_a, &tx_broadcaster, &router, &logger_a, &keys_manager_a, config.clone(), ChainParameters {
                        network,
                        best_block: BestBlock::from_genesis(network),
                });
@@ -7790,7 +8369,7 @@ pub mod bench {
                let chain_monitor_b = ChainMonitor::new(None, &tx_broadcaster, &logger_a, &fee_estimator, &persister_b);
                let seed_b = [2u8; 32];
                let keys_manager_b = KeysManager::new(&seed_b, 42, 42);
-               let node_b = ChannelManager::new(&fee_estimator, &chain_monitor_b, &tx_broadcaster, &logger_b, &keys_manager_b, config.clone(), ChainParameters {
+               let node_b = ChannelManager::new(&fee_estimator, &chain_monitor_b, &tx_broadcaster, &router, &logger_b, &keys_manager_b, config.clone(), ChainParameters {
                        network,
                        best_block: BestBlock::from_genesis(network),
                });