/// A monitor event that the Channel's commitment transaction was confirmed.
CommitmentTxConfirmed(OutPoint),
+
+ /// Indicates a [`ChannelMonitor`] update has completed. See
+ /// [`ChannelMonitorUpdateErr::TemporaryFailure`] for more information on how this is used.
+ ///
+ /// [`ChannelMonitorUpdateErr::TemporaryFailure`]: super::ChannelMonitorUpdateErr::TemporaryFailure
+ UpdateCompleted {
+ /// The funding outpoint of the [`ChannelMonitor`] that was updated
+ funding_txo: OutPoint,
+ /// The Update ID from [`ChannelMonitorUpdate::update_id`] which was applied or
+ /// [`ChannelMonitor::get_latest_update_id`].
+ ///
+ /// Note that this should only be set to a given update's ID if all previous updates for the
+ /// same [`ChannelMonitor`] have been applied and persisted.
+ monitor_update_id: u64,
+ },
+
+ /// Indicates a [`ChannelMonitor`] update has failed. See
+ /// [`ChannelMonitorUpdateErr::PermanentFailure`] for more information on how this is used.
+ ///
+ /// [`ChannelMonitorUpdateErr::PermanentFailure`]: super::ChannelMonitorUpdateErr::PermanentFailure
+ UpdateFailed(OutPoint),
}
+impl_writeable_tlv_based_enum_upgradable!(MonitorEvent,
+ // Note that UpdateCompleted and UpdateFailed are currently never serialized to disk as they are
+ // generated only in ChainMonitor
+ (0, UpdateCompleted) => {
+ (0, funding_txo, required),
+ (2, monitor_update_id, required),
+ },
+;
+ (2, HTLCEvent),
+ (4, CommitmentTxConfirmed),
+ (6, UpdateFailed),
+);
/// Simple structure sent back by `chain::Watch` when an HTLC from a forward channel is detected on
/// chain. Used to update the corresponding HTLC in the backward channel. Failing to pass the
payment_preimages: HashMap<PaymentHash, PaymentPreimage>,
+ // Note that `MonitorEvent`s MUST NOT be generated during update processing, only generated
+ // during chain data processing. This prevents a race in `ChainMonitor::update_channel` (and
+ // presumably user implementations thereof as well) where we update the in-memory channel
+ // object, then before the persistence finishes (as it's all under a read-lock), we return
+ // pending events to the user or to the relevant `ChannelManager`. Then, on reload, we'll have
+ // the pre-event state here, but have processed the event in the `ChannelManager`.
+ // Note that because the `event_lock` in `ChainMonitor` is only taken in
+ // block/transaction-connected events and *not* during block/transaction-disconnected events,
+ // we further MUST NOT generate events during block/transaction-disconnection.
pending_monitor_events: Vec<MonitorEvent>,
+
pending_events: Vec<Event>,
// Used to track on-chain events (i.e., transactions part of channels confirmed on chain) on
writer.write_all(&payment_preimage.0[..])?;
}
- writer.write_all(&byte_utils::be64_to_array(self.pending_monitor_events.len() as u64))?;
+ writer.write_all(&(self.pending_monitor_events.iter().filter(|ev| match ev {
+ MonitorEvent::HTLCEvent(_) => true,
+ MonitorEvent::CommitmentTxConfirmed(_) => true,
+ _ => false,
+ }).count() as u64).to_be_bytes())?;
for event in self.pending_monitor_events.iter() {
match event {
MonitorEvent::HTLCEvent(upd) => {
0u8.write(writer)?;
upd.write(writer)?;
},
- MonitorEvent::CommitmentTxConfirmed(_) => 1u8.write(writer)?
+ MonitorEvent::CommitmentTxConfirmed(_) => 1u8.write(writer)?,
+ _ => {}, // Covered in the TLV writes below
}
}
write_tlv_fields!(writer, {
(1, self.funding_spend_confirmed, option),
(3, self.htlcs_resolved_on_chain, vec_type),
+ (5, self.pending_monitor_events, vec_type),
});
Ok(())
}
let pending_monitor_events_len: u64 = Readable::read(reader)?;
- let mut pending_monitor_events = Vec::with_capacity(cmp::min(pending_monitor_events_len as usize, MAX_ALLOC_SIZE / (32 + 8*3)));
+ let mut pending_monitor_events = Some(
+ Vec::with_capacity(cmp::min(pending_monitor_events_len as usize, MAX_ALLOC_SIZE / (32 + 8*3))));
for _ in 0..pending_monitor_events_len {
let ev = match <u8 as Readable>::read(reader)? {
0 => MonitorEvent::HTLCEvent(Readable::read(reader)?),
1 => MonitorEvent::CommitmentTxConfirmed(funding_info.0),
_ => return Err(DecodeError::InvalidValue)
};
- pending_monitor_events.push(ev);
+ pending_monitor_events.as_mut().unwrap().push(ev);
}
let pending_events_len: u64 = Readable::read(reader)?;
read_tlv_fields!(reader, {
(1, funding_spend_confirmed, option),
(3, htlcs_resolved_on_chain, vec_type),
+ (5, pending_monitor_events, vec_type),
});
let mut secp_ctx = Secp256k1::new();
current_holder_commitment_number,
payment_preimages,
- pending_monitor_events,
+ pending_monitor_events: pending_monitor_events.unwrap(),
pending_events,
onchain_events_awaiting_threshold_conf,