Remove Key parameter from ChainMonitor

ChainMonitor's template Key parameter was meant to allow supporting
both local monitoring, where Key=OutPoint, and watchtowers, where Key=
(PublicKey, u32). Use OutPoint directly since the watchtower case will
not be supported this way.

diff --git a/fuzz/src/chanmon_consistency.rs b/fuzz/src/chanmon_consistency.rs
index 332940b2f7a8278deb890eb5add202e81a3f6c19..ce407f329bd194d3f580ca93fb71ba787fdebd4b 100644 (file)
--- a/fuzz/src/chanmon_consistency.rs
+++ b/fuzz/src/chanmon_consistency.rs
@@ -83,7 +83,7 @@ impl Writer for VecWriter {
 
 struct TestChainMonitor {
        pub logger: Arc<dyn Logger>,
-       pub chain_monitor: Arc<channelmonitor::ChainMonitor<OutPoint, EnforcingChannelKeys, Arc<TestBroadcaster>, Arc<FuzzEstimator>, Arc<dyn Logger>>>,
+       pub chain_monitor: Arc<channelmonitor::ChainMonitor<EnforcingChannelKeys, Arc<TestBroadcaster>, Arc<FuzzEstimator>, Arc<dyn Logger>>>,
        pub update_ret: Mutex<Result<(), channelmonitor::ChannelMonitorUpdateErr>>,
        // If we reload a node with an old copy of ChannelMonitors, the ChannelManager deserialization
        // logic will automatically force-close our channels for us (as we don't have an up-to-date

diff --git a/fuzz/src/full_stack.rs b/fuzz/src/full_stack.rs
index 8d1c6886562d8b2dc2d665414ec10da91e8550de..03d2903204dae895a387120c68482b0f8739b8af 100644 (file)
--- a/fuzz/src/full_stack.rs
+++ b/fuzz/src/full_stack.rs
@@ -145,14 +145,13 @@ impl<'a> std::hash::Hash for Peer<'a> {
 
 type ChannelMan = ChannelManager<
        EnforcingChannelKeys,
-       Arc<channelmonitor::ChainMonitor<OutPoint, EnforcingChannelKeys, Arc<TestBroadcaster>, Arc<FuzzEstimator>, Arc<dyn Logger>>>,
+       Arc<channelmonitor::ChainMonitor<EnforcingChannelKeys, Arc<TestBroadcaster>, Arc<FuzzEstimator>, Arc<dyn Logger>>>,
        Arc<TestBroadcaster>, Arc<KeyProvider>, Arc<FuzzEstimator>, Arc<dyn Logger>>;
 type PeerMan<'a> = PeerManager<Peer<'a>, Arc<ChannelMan>, Arc<NetGraphMsgHandler<Arc<dyn chain::Access>, Arc<dyn Logger>>>, Arc<dyn Logger>>;
 
 struct MoneyLossDetector<'a> {
        manager: Arc<ChannelMan>,
-       monitor: Arc<channelmonitor::ChainMonitor<
-               OutPoint, EnforcingChannelKeys, Arc<TestBroadcaster>, Arc<FuzzEstimator>, Arc<dyn Logger>>>,
+       monitor: Arc<channelmonitor::ChainMonitor<EnforcingChannelKeys, Arc<TestBroadcaster>, Arc<FuzzEstimator>, Arc<dyn Logger>>>,
        handler: PeerMan<'a>,
 
        peers: &'a RefCell<[bool; 256]>,
@@ -166,7 +165,7 @@ struct MoneyLossDetector<'a> {
 impl<'a> MoneyLossDetector<'a> {
        pub fn new(peers: &'a RefCell<[bool; 256]>,
                   manager: Arc<ChannelMan>,
-                  monitor: Arc<channelmonitor::ChainMonitor<OutPoint, EnforcingChannelKeys, Arc<TestBroadcaster>, Arc<FuzzEstimator>, Arc<dyn Logger>>>,
+                  monitor: Arc<channelmonitor::ChainMonitor<EnforcingChannelKeys, Arc<TestBroadcaster>, Arc<FuzzEstimator>, Arc<dyn Logger>>>,
                   handler: PeerMan<'a>) -> Self {
                MoneyLossDetector {
                        manager,

diff --git a/lightning-net-tokio/src/lib.rs b/lightning-net-tokio/src/lib.rs
index d307116484fc77b201f6315ad594898222ae7030..2e99b71df3094e027363ba1c21b341205dab2c25 100644 (file)
--- a/lightning-net-tokio/src/lib.rs
+++ b/lightning-net-tokio/src/lib.rs
@@ -35,7 +35,7 @@
 //! type FeeEstimator = dyn lightning::chain::chaininterface::FeeEstimator;
 //! type Logger = dyn lightning::util::logger::Logger;
 //! type ChainAccess = dyn lightning::chain::Access;
-//! type ChainMonitor = lightning::ln::channelmonitor::ChainMonitor<lightning::chain::transaction::OutPoint, lightning::chain::keysinterface::InMemoryChannelKeys, Arc<TxBroadcaster>, Arc<FeeEstimator>, Arc<Logger>>;
+//! type ChainMonitor = lightning::ln::channelmonitor::ChainMonitor<lightning::chain::keysinterface::InMemoryChannelKeys, Arc<TxBroadcaster>, Arc<FeeEstimator>, Arc<Logger>>;
 //! type ChannelManager = lightning::ln::channelmanager::SimpleArcChannelManager<ChainMonitor, TxBroadcaster, FeeEstimator, Logger>;
 //! type PeerManager = lightning::ln::peer_handler::SimpleArcPeerManager<lightning_net_tokio::SocketDescriptor, ChainMonitor, TxBroadcaster, FeeEstimator, ChainAccess, Logger>;
 //!

diff --git a/lightning/src/ln/channelmonitor.rs b/lightning/src/ln/channelmonitor.rs
index 3f3f06f4064d49908aa3083261d28d2495dc24ba..b601f741ed978a2d3827adf7b9c4b804409e7428 100644 (file)
--- a/lightning/src/ln/channelmonitor.rs
+++ b/lightning/src/ln/channelmonitor.rs
@@ -53,7 +53,7 @@ use util::events::Event;
 
 use std::collections::{HashMap, HashSet, hash_map};
 use std::sync::Mutex;
-use std::{hash,cmp, mem};
+use std::{cmp, mem};
 use std::ops::Deref;
 use std::io::Error;
 
@@ -188,28 +188,20 @@ pub struct HTLCUpdate {
 }
 impl_writeable!(HTLCUpdate, 0, { payment_hash, payment_preimage, source });
 
-/// A simple implementation of a [`chain::Watch`] and ChainListener. Can be used to create a
-/// watchtower or watch our own channels.
+/// An implementation of a [`chain::Watch`] and ChainListener.
 ///
-/// Note that you must provide your own key by which to refer to channels.
-///
-/// If you're accepting remote monitors (ie are implementing a watchtower), you must verify that
-/// users cannot overwrite a given channel by providing a duplicate key. ie you should probably
-/// index by a PublicKey which is required to sign any updates.
-///
-/// If you're using this for local monitoring of your own channels, you probably want to use
-/// `OutPoint` as the key, which will give you a [`chain::Watch`] implementation.
+/// May be used in conjunction with [`ChannelManager`] to monitor channels locally or used
+/// independently to monitor channels remotely.
 ///
 /// [`chain::Watch`]: ../../chain/trait.Watch.html
-///
-/// (C-not exported) due to an unconstrained generic in `Key`
-pub struct ChainMonitor<Key, ChanSigner: ChannelKeys, T: Deref, F: Deref, L: Deref>
+/// [`ChannelManager`]: ../channelmanager/struct.ChannelManager.html
+pub struct ChainMonitor<ChanSigner: ChannelKeys, T: Deref, F: Deref, L: Deref>
        where T::Target: BroadcasterInterface,
         F::Target: FeeEstimator,
         L::Target: Logger,
 {
        /// The monitors
-       pub monitors: Mutex<HashMap<Key, ChannelMonitor<ChanSigner>>>,
+       pub monitors: Mutex<HashMap<OutPoint, ChannelMonitor<ChanSigner>>>,
        watch_events: Mutex<WatchEventQueue>,
        broadcaster: T,
        logger: L,
@@ -277,8 +269,8 @@ impl WatchEventQueue {
        }
 }
 
-impl<Key : Send + cmp::Eq + hash::Hash, ChanSigner: ChannelKeys, T: Deref + Sync + Send, F: Deref + Sync + Send, L: Deref + Sync + Send>
-       ChainListener for ChainMonitor<Key, ChanSigner, T, F, L>
+impl<ChanSigner: ChannelKeys, T: Deref + Sync + Send, F: Deref + Sync + Send, L: Deref + Sync + Send>
+       ChainListener for ChainMonitor<ChanSigner, T, F, L>
        where T::Target: BroadcasterInterface,
              F::Target: FeeEstimator,
              L::Target: Logger,
@@ -308,14 +300,14 @@ impl<Key : Send + cmp::Eq + hash::Hash, ChanSigner: ChannelKeys, T: Deref + Sync
        }
 }
 
-impl<Key : Send + cmp::Eq + hash::Hash + 'static, ChanSigner: ChannelKeys, T: Deref, F: Deref, L: Deref> ChainMonitor<Key, ChanSigner, T, F, L>
+impl<ChanSigner: ChannelKeys, T: Deref, F: Deref, L: Deref> ChainMonitor<ChanSigner, T, F, L>
        where T::Target: BroadcasterInterface,
              F::Target: FeeEstimator,
              L::Target: Logger,
 {
        /// Creates a new object which can be used to monitor several channels given the chain
        /// interface with which to register to receive notifications.
-       pub fn new(broadcaster: T, logger: L, feeest: F) -> ChainMonitor<Key, ChanSigner, T, F, L> {
+       pub fn new(broadcaster: T, logger: L, feeest: F) -> Self {
                Self {
                        monitors: Mutex::new(HashMap::new()),
                        watch_events: Mutex::new(WatchEventQueue::new()),
@@ -325,12 +317,12 @@ impl<Key : Send + cmp::Eq + hash::Hash + 'static, ChanSigner: ChannelKeys, T: De
                }
        }
 
-       /// Adds or updates the monitor which monitors the channel referred to by the given key.
-       fn add_monitor_by_key(&self, key: Key, monitor: ChannelMonitor<ChanSigner>) -> Result<(), MonitorUpdateError> {
+       /// Adds the monitor that watches the channel referred to by the given outpoint.
+       fn add_monitor(&self, outpoint: OutPoint, monitor: ChannelMonitor<ChanSigner>) -> Result<(), MonitorUpdateError> {
                let mut watch_events = self.watch_events.lock().unwrap();
                let mut monitors = self.monitors.lock().unwrap();
-               let entry = match monitors.entry(key) {
-                       hash_map::Entry::Occupied(_) => return Err(MonitorUpdateError("Channel monitor for given key is already present")),
+               let entry = match monitors.entry(outpoint) {
+                       hash_map::Entry::Occupied(_) => return Err(MonitorUpdateError("Channel monitor for given outpoint is already present")),
                        hash_map::Entry::Vacant(e) => e,
                };
                {
@@ -348,10 +340,10 @@ impl<Key : Send + cmp::Eq + hash::Hash + 'static, ChanSigner: ChannelKeys, T: De
                Ok(())
        }
 
-       /// Updates the monitor which monitors the channel referred to by the given key.
-       fn update_monitor_by_key(&self, key: Key, update: ChannelMonitorUpdate) -> Result<(), MonitorUpdateError> {
+       /// Updates the monitor that watches the channel referred to by the given outpoint.
+       fn update_monitor(&self, outpoint: OutPoint, update: ChannelMonitorUpdate) -> Result<(), MonitorUpdateError> {
                let mut monitors = self.monitors.lock().unwrap();
-               match monitors.get_mut(&key) {
+               match monitors.get_mut(&outpoint) {
                        Some(orig_monitor) => {
                                log_trace!(self.logger, "Updating Channel Monitor for channel {}", log_funding_info!(orig_monitor));
                                orig_monitor.update_monitor(update, &self.broadcaster, &self.logger)
@@ -361,7 +353,7 @@ impl<Key : Send + cmp::Eq + hash::Hash + 'static, ChanSigner: ChannelKeys, T: De
        }
 }
 
-impl<ChanSigner: ChannelKeys, T: Deref + Sync + Send, F: Deref + Sync + Send, L: Deref + Sync + Send> chain::Watch for ChainMonitor<OutPoint, ChanSigner, T, F, L>
+impl<ChanSigner: ChannelKeys, T: Deref + Sync + Send, F: Deref + Sync + Send, L: Deref + Sync + Send> chain::Watch for ChainMonitor<ChanSigner, T, F, L>
        where T::Target: BroadcasterInterface,
              F::Target: FeeEstimator,
              L::Target: Logger,
@@ -369,14 +361,14 @@ impl<ChanSigner: ChannelKeys, T: Deref + Sync + Send, F: Deref + Sync + Send, L:
        type Keys = ChanSigner;
 
        fn watch_channel(&self, funding_txo: OutPoint, monitor: ChannelMonitor<ChanSigner>) -> Result<(), ChannelMonitorUpdateErr> {
-               match self.add_monitor_by_key(funding_txo, monitor) {
+               match self.add_monitor(funding_txo, monitor) {
                        Ok(_) => Ok(()),
                        Err(_) => Err(ChannelMonitorUpdateErr::PermanentFailure),
                }
        }
 
        fn update_channel(&self, funding_txo: OutPoint, update: ChannelMonitorUpdate) -> Result<(), ChannelMonitorUpdateErr> {
-               match self.update_monitor_by_key(funding_txo, update) {
+               match self.update_monitor(funding_txo, update) {
                        Ok(_) => Ok(()),
                        Err(_) => Err(ChannelMonitorUpdateErr::PermanentFailure),
                }
@@ -391,7 +383,7 @@ impl<ChanSigner: ChannelKeys, T: Deref + Sync + Send, F: Deref + Sync + Send, L:
        }
 }
 
-impl<Key : Send + cmp::Eq + hash::Hash, ChanSigner: ChannelKeys, T: Deref, F: Deref, L: Deref> events::EventsProvider for ChainMonitor<Key, ChanSigner, T, F, L>
+impl<ChanSigner: ChannelKeys, T: Deref, F: Deref, L: Deref> events::EventsProvider for ChainMonitor<ChanSigner, T, F, L>
        where T::Target: BroadcasterInterface,
              F::Target: FeeEstimator,
              L::Target: Logger,
@@ -405,7 +397,7 @@ impl<Key : Send + cmp::Eq + hash::Hash, ChanSigner: ChannelKeys, T: Deref, F: De
        }
 }
 
-impl<Key : Send + cmp::Eq + hash::Hash, ChanSigner: ChannelKeys, T: Deref, F: Deref, L: Deref> chain::WatchEventProvider for ChainMonitor<Key, ChanSigner, T, F, L>
+impl<ChanSigner: ChannelKeys, T: Deref, F: Deref, L: Deref> chain::WatchEventProvider for ChainMonitor<ChanSigner, T, F, L>
        where T::Target: BroadcasterInterface,
              F::Target: FeeEstimator,
              L::Target: Logger,

diff --git a/lightning/src/util/test_utils.rs b/lightning/src/util/test_utils.rs
index e505774cc47c6d987ce45ddbc9e4b3840225527a..bc084b77ea07f6b946ef0c7ad14e0720a9ce24d9 100644 (file)
--- a/lightning/src/util/test_utils.rs
+++ b/lightning/src/util/test_utils.rs
@@ -62,7 +62,7 @@ impl chaininterface::FeeEstimator for TestFeeEstimator {
 pub struct TestChainMonitor<'a> {
        pub added_monitors: Mutex<Vec<(OutPoint, channelmonitor::ChannelMonitor<EnforcingChannelKeys>)>>,
        pub latest_monitor_update_id: Mutex<HashMap<[u8; 32], (OutPoint, u64)>>,
-       pub chain_monitor: channelmonitor::ChainMonitor<OutPoint, EnforcingChannelKeys, &'a chaininterface::BroadcasterInterface, &'a TestFeeEstimator, &'a TestLogger>,
+       pub chain_monitor: channelmonitor::ChainMonitor<EnforcingChannelKeys, &'a chaininterface::BroadcasterInterface, &'a TestFeeEstimator, &'a TestLogger>,
        pub update_ret: Mutex<Result<(), channelmonitor::ChannelMonitorUpdateErr>>,
        // If this is set to Some(), after the next return, we'll always return this until update_ret
        // is changed: