fn get_relevant_txids(&self) -> Vec<Txid>;
}
-/// An error enum representing a failure to persist a channel monitor update.
+/// An enum representing the status of a channel monitor update persistence.
#[derive(Clone, Copy, Debug, PartialEq)]
-pub enum ChannelMonitorUpdateErr {
+pub enum ChannelMonitorUpdateStatus {
+ /// The update has been durably persisted and all copies of the relevant [`ChannelMonitor`]
+ /// have been updated.
+ ///
+ /// This includes performing any `fsync()` calls required to ensure the update is guaranteed to
+ /// be available on restart even if the application crashes.
+ Completed,
/// Used to indicate a temporary failure (eg connection to a watchtower or remote backup of
/// our state failed, but is expected to succeed at some point in the future).
///
/// Such a failure will "freeze" a channel, preventing us from revoking old states or
/// submitting new commitment transactions to the counterparty. Once the update(s) which failed
- /// have been successfully applied, a [`MonitorEvent::UpdateCompleted`] can be used to restore
- /// the channel to an operational state.
+ /// have been successfully applied, a [`MonitorEvent::Completed`] can be used to restore the
+ /// channel to an operational state.
///
/// Note that a given [`ChannelManager`] will *never* re-generate a [`ChannelMonitorUpdate`].
/// If you return this error you must ensure that it is written to disk safely before writing
/// attempting to claim it on this channel) and those updates must still be persisted.
///
/// No updates to the channel will be made which could invalidate other [`ChannelMonitor`]s
- /// until a [`MonitorEvent::UpdateCompleted`] is provided, even if you return no error on a
- /// later monitor update for the same channel.
+ /// until a [`MonitorEvent::Completed`] is provided, even if you return no error on a later
+ /// monitor update for the same channel.
///
/// For deployments where a copy of ChannelMonitors and other local state are backed up in a
/// remote location (with local copies persisted immediately), it is anticipated that all
- /// updates will return TemporaryFailure until the remote copies could be updated.
+ /// updates will return [`InProgress`] until the remote copies could be updated.
///
- /// [`PermanentFailure`]: ChannelMonitorUpdateErr::PermanentFailure
+ /// [`PermanentFailure`]: ChannelMonitorUpdateStatus::PermanentFailure
+ /// [`InProgress`]: ChannelMonitorUpdateStatus::InProgress
/// [`ChannelManager`]: crate::ln::channelmanager::ChannelManager
- TemporaryFailure,
+ InProgress,
/// Used to indicate no further channel monitor updates will be allowed (likely a disk failure
/// or a remote copy of this [`ChannelMonitor`] is no longer reachable and thus not updatable).
///
/// storage is used to claim outputs of rejected state confirmed onchain by another watchtower,
/// lagging behind on block processing.
///
- /// [`PermanentFailure`]: ChannelMonitorUpdateErr::PermanentFailure
+ /// [`PermanentFailure`]: ChannelMonitorUpdateStatus::PermanentFailure
/// [`ChannelManager`]: crate::ln::channelmanager::ChannelManager
PermanentFailure,
}
/// If an implementation maintains multiple instances of a channel's monitor (e.g., by storing
/// backup copies), then it must ensure that updates are applied across all instances. Otherwise, it
/// could result in a revoked transaction being broadcast, allowing the counterparty to claim all
-/// funds in the channel. See [`ChannelMonitorUpdateErr`] for more details about how to handle
+/// funds in the channel. See [`ChannelMonitorUpdateStatus`] for more details about how to handle
/// multiple instances.
///
-/// [`PermanentFailure`]: ChannelMonitorUpdateErr::PermanentFailure
+/// [`PermanentFailure`]: ChannelMonitorUpdateStatus::PermanentFailure
pub trait Watch<ChannelSigner: Sign> {
/// Watches a channel identified by `funding_txo` using `monitor`.
///
/// with any spends of outputs returned by [`get_outputs_to_watch`]. In practice, this means
/// calling [`block_connected`] and [`block_disconnected`] on the monitor.
///
- /// Note: this interface MUST error with [`ChannelMonitorUpdateErr::PermanentFailure`] if
+ /// Note: this interface MUST error with [`ChannelMonitorUpdateStatus::PermanentFailure`] if
/// the given `funding_txo` has previously been registered via `watch_channel`.
///
/// [`get_outputs_to_watch`]: channelmonitor::ChannelMonitor::get_outputs_to_watch
/// [`block_connected`]: channelmonitor::ChannelMonitor::block_connected
/// [`block_disconnected`]: channelmonitor::ChannelMonitor::block_disconnected
- fn watch_channel(&self, funding_txo: OutPoint, monitor: ChannelMonitor<ChannelSigner>) -> Result<(), ChannelMonitorUpdateErr>;
+ fn watch_channel(&self, funding_txo: OutPoint, monitor: ChannelMonitor<ChannelSigner>) -> ChannelMonitorUpdateStatus;
/// Updates a channel identified by `funding_txo` by applying `update` to its monitor.
///
/// Implementations must call [`update_monitor`] with the given update. See
- /// [`ChannelMonitorUpdateErr`] for invariants around returning an error.
+ /// [`ChannelMonitorUpdateStatus`] for invariants around returning an error.
///
/// [`update_monitor`]: channelmonitor::ChannelMonitor::update_monitor
- fn update_channel(&self, funding_txo: OutPoint, update: ChannelMonitorUpdate) -> Result<(), ChannelMonitorUpdateErr>;
+ fn update_channel(&self, funding_txo: OutPoint, update: ChannelMonitorUpdate) -> ChannelMonitorUpdateStatus;
/// Returns any monitor events since the last call. Subsequent calls must only return new
/// events.
/// to disk.
///
/// For details on asynchronous [`ChannelMonitor`] updating and returning
- /// [`MonitorEvent::UpdateCompleted`] here, see [`ChannelMonitorUpdateErr::TemporaryFailure`].
+ /// [`MonitorEvent::Completed`] here, see [`ChannelMonitorUpdateStatus::InProgress`].
fn release_pending_monitor_events(&self) -> Vec<(OutPoint, Vec<MonitorEvent>, Option<PublicKey>)>;
}
/// Note that use as part of a [`Watch`] implementation involves reentrancy. Therefore, the `Filter`
/// should not block on I/O. Implementations should instead queue the newly monitored data to be
/// processed later. Then, in order to block until the data has been processed, any [`Watch`]
-/// invocation that has called the `Filter` must return [`TemporaryFailure`].
+/// invocation that has called the `Filter` must return [`InProgress`].
///
-/// [`TemporaryFailure`]: ChannelMonitorUpdateErr::TemporaryFailure
+/// [`InProgress`]: ChannelMonitorUpdateStatus::InProgress
/// [BIP 157]: https://github.com/bitcoin/bips/blob/master/bip-0157.mediawiki
/// [BIP 158]: https://github.com/bitcoin/bips/blob/master/bip-0158.mediawiki
pub trait Filter {
projects / rust-lightning / blobdiff