X-Git-Url: http://git.bitcoin.ninja/index.cgi?p=ldk-c-bindings;a=blobdiff_plain;f=lightning-c-bindings%2Fsrc%2Flightning%2Fchain%2Fchainmonitor.rs;h=5c37216daf5d3e480a30f797ccfe534a731f7e95;hp=08997943b07b91c45ba5e7d6c7457fd7633955ed;hb=7428d63475aee8fa920405fd14eda47113337798;hpb=1494419236215293d0aae77388bbb1ff33fed589 diff --git a/lightning-c-bindings/src/lightning/chain/chainmonitor.rs b/lightning-c-bindings/src/lightning/chain/chainmonitor.rs index 0899794..5c37216 100644 --- a/lightning-c-bindings/src/lightning/chain/chainmonitor.rs +++ b/lightning-c-bindings/src/lightning/chain/chainmonitor.rs @@ -28,9 +28,165 @@ use core::convert::Infallible; use bitcoin::hashes::Hash; use crate::c_types::*; +/// `Persist` defines behavior for persisting channel monitors: this could mean +/// writing once to disk, and/or uploading to one or more backup services. +/// +/// Note that for every new monitor, you **must** persist the new `ChannelMonitor` +/// to disk/backups. And, on every update, you **must** persist either the +/// `ChannelMonitorUpdate` or the updated monitor itself. Otherwise, there is risk +/// of situations such as revoking a transaction, then crashing before this +/// revocation can be persisted, then unintentionally broadcasting a revoked +/// transaction and losing money. This is a risk because previous channel states +/// are toxic, so it's important that whatever channel state is persisted is +/// kept up-to-date. +#[repr(C)] +pub struct Persist { + /// An opaque pointer which is passed to your function implementations as an argument. + /// This has no meaning in the LDK, and can be NULL or any other value. + pub this_arg: *mut c_void, + /// Persist a new channel's data. The data can be stored any way you want, but + /// the identifier provided by Rust-Lightning is the channel's outpoint (and + /// it is up to you to maintain a correct mapping between the outpoint and the + /// stored channel data). Note that you **must** persist every new monitor to + /// disk. See the `Persist` trait documentation for more details. + /// + /// See [`Writeable::write`] on [`ChannelMonitor`] for writing out a `ChannelMonitor` + /// and [`ChannelMonitorUpdateErr`] for requirements when returning errors. + /// + /// [`Writeable::write`]: crate::util::ser::Writeable::write + #[must_use] + pub persist_new_channel: extern "C" fn (this_arg: *const c_void, id: crate::lightning::chain::transaction::OutPoint, data: &crate::lightning::chain::channelmonitor::ChannelMonitor) -> crate::c_types::derived::CResult_NoneChannelMonitorUpdateErrZ, + /// Update one channel's data. The provided `ChannelMonitor` has already + /// applied the given update. + /// + /// Note that on every update, you **must** persist either the + /// `ChannelMonitorUpdate` or the updated monitor itself to disk/backups. See + /// the `Persist` trait documentation for more details. + /// + /// If an implementer chooses to persist the updates only, they need to make + /// sure that all the updates are applied to the `ChannelMonitors` *before* + /// the set of channel monitors is given to the `ChannelManager` + /// deserialization routine. See [`ChannelMonitor::update_monitor`] for + /// applying a monitor update to a monitor. If full `ChannelMonitors` are + /// persisted, then there is no need to persist individual updates. + /// + /// Note that there could be a performance tradeoff between persisting complete + /// channel monitors on every update vs. persisting only updates and applying + /// them in batches. The size of each monitor grows `O(number of state updates)` + /// whereas updates are small and `O(1)`. + /// + /// See [`Writeable::write`] on [`ChannelMonitor`] for writing out a `ChannelMonitor`, + /// [`Writeable::write`] on [`ChannelMonitorUpdate`] for writing out an update, and + /// [`ChannelMonitorUpdateErr`] for requirements when returning errors. + /// + /// [`Writeable::write`]: crate::util::ser::Writeable::write + #[must_use] + pub update_persisted_channel: extern "C" fn (this_arg: *const c_void, id: crate::lightning::chain::transaction::OutPoint, update: &crate::lightning::chain::channelmonitor::ChannelMonitorUpdate, data: &crate::lightning::chain::channelmonitor::ChannelMonitor) -> crate::c_types::derived::CResult_NoneChannelMonitorUpdateErrZ, + /// Frees any resources associated with this object given its this_arg pointer. + /// Does not need to free the outer struct containing function pointers and may be NULL is no resources need to be freed. + pub free: Option, +} +unsafe impl Send for Persist {} +unsafe impl Sync for Persist {} +#[no_mangle] +pub(crate) extern "C" fn Persist_clone_fields(orig: &Persist) -> Persist { + Persist { + this_arg: orig.this_arg, + persist_new_channel: Clone::clone(&orig.persist_new_channel), + update_persisted_channel: Clone::clone(&orig.update_persisted_channel), + free: Clone::clone(&orig.free), + } +} + +use lightning::chain::chainmonitor::Persist as rustPersist; +impl rustPersist for Persist { + fn persist_new_channel(&self, mut id: lightning::chain::transaction::OutPoint, mut data: &lightning::chain::channelmonitor::ChannelMonitor) -> Result<(), lightning::chain::ChannelMonitorUpdateErr> { + let mut ret = (self.persist_new_channel)(self.this_arg, crate::lightning::chain::transaction::OutPoint { inner: ObjOps::heap_alloc(id), is_owned: true }, &crate::lightning::chain::channelmonitor::ChannelMonitor { inner: unsafe { ObjOps::nonnull_ptr_to_inner((data as *const _) as *mut _) }, is_owned: false }); + let mut local_ret = match ret.result_ok { true => Ok( { () /*(*unsafe { Box::from_raw(<*mut _>::take_ptr(&mut ret.contents.result)) })*/ }), false => Err( { (*unsafe { Box::from_raw(<*mut _>::take_ptr(&mut ret.contents.err)) }).into_native() })}; + local_ret + } + fn update_persisted_channel(&self, mut id: lightning::chain::transaction::OutPoint, mut update: &lightning::chain::channelmonitor::ChannelMonitorUpdate, mut data: &lightning::chain::channelmonitor::ChannelMonitor) -> Result<(), lightning::chain::ChannelMonitorUpdateErr> { + let mut ret = (self.update_persisted_channel)(self.this_arg, crate::lightning::chain::transaction::OutPoint { inner: ObjOps::heap_alloc(id), is_owned: true }, &crate::lightning::chain::channelmonitor::ChannelMonitorUpdate { inner: unsafe { ObjOps::nonnull_ptr_to_inner((update as *const _) as *mut _) }, is_owned: false }, &crate::lightning::chain::channelmonitor::ChannelMonitor { inner: unsafe { ObjOps::nonnull_ptr_to_inner((data as *const _) as *mut _) }, is_owned: false }); + let mut local_ret = match ret.result_ok { true => Ok( { () /*(*unsafe { Box::from_raw(<*mut _>::take_ptr(&mut ret.contents.result)) })*/ }), false => Err( { (*unsafe { Box::from_raw(<*mut _>::take_ptr(&mut ret.contents.err)) }).into_native() })}; + local_ret + } +} + +// We're essentially a pointer already, or at least a set of pointers, so allow us to be used +// directly as a Deref trait in higher-level structs: +impl std::ops::Deref for Persist { + type Target = Self; + fn deref(&self) -> &Self { + self + } +} +/// Calls the free function if one is set +#[no_mangle] +pub extern "C" fn Persist_free(this_ptr: Persist) { } +impl Drop for Persist { + fn drop(&mut self) { + if let Some(f) = self.free { + f(self.this_arg); + } + } +} + +use lightning::chain::chainmonitor::LockedChannelMonitor as nativeLockedChannelMonitorImport; +type nativeLockedChannelMonitor = nativeLockedChannelMonitorImport<'static, crate::lightning::chain::keysinterface::Sign>; + +/// A read-only reference to a current ChannelMonitor. +/// +/// Note that this holds a mutex in [`ChainMonitor`] and may block other events until it is +/// released. +#[must_use] +#[repr(C)] +pub struct LockedChannelMonitor { + /// A pointer to the opaque Rust object. + + /// Nearly everywhere, inner must be non-null, however in places where + /// the Rust equivalent takes an Option, it may be set to null to indicate None. + pub inner: *mut nativeLockedChannelMonitor, + /// Indicates that this is the only struct which contains the same pointer. + + /// Rust functions which take ownership of an object provided via an argument require + /// this to be true and invalidate the object pointed to by inner. + pub is_owned: bool, +} + +impl Drop for LockedChannelMonitor { + fn drop(&mut self) { + if self.is_owned && !<*mut nativeLockedChannelMonitor>::is_null(self.inner) { + let _ = unsafe { Box::from_raw(ObjOps::untweak_ptr(self.inner)) }; + } + } +} +/// Frees any resources used by the LockedChannelMonitor, if is_owned is set and inner is non-NULL. +#[no_mangle] +pub extern "C" fn LockedChannelMonitor_free(this_obj: LockedChannelMonitor) { } +#[allow(unused)] +/// Used only if an object of this type is returned as a trait impl by a method +extern "C" fn LockedChannelMonitor_free_void(this_ptr: *mut c_void) { + unsafe { let _ = Box::from_raw(this_ptr as *mut nativeLockedChannelMonitor); } +} +#[allow(unused)] +impl LockedChannelMonitor { + pub(crate) fn get_native_ref(&self) -> &'static nativeLockedChannelMonitor { + unsafe { &*ObjOps::untweak_ptr(self.inner) } + } + pub(crate) fn get_native_mut_ref(&self) -> &'static mut nativeLockedChannelMonitor { + unsafe { &mut *ObjOps::untweak_ptr(self.inner) } + } + /// When moving out of the pointer, we have to ensure we aren't a reference, this makes that easy + pub(crate) fn take_inner(mut self) -> *mut nativeLockedChannelMonitor { + assert!(self.is_owned); + let ret = ObjOps::untweak_ptr(self.inner); + self.inner = std::ptr::null_mut(); + ret + } +} use lightning::chain::chainmonitor::ChainMonitor as nativeChainMonitorImport; -type nativeChainMonitor = nativeChainMonitorImport; +type nativeChainMonitor = nativeChainMonitorImport; /// An implementation of [`chain::Watch`] for monitoring channels. /// @@ -96,7 +252,7 @@ impl ChainMonitor { /// transactions relevant to the watched channels. #[must_use] #[no_mangle] -pub extern "C" fn ChainMonitor_new(mut chain_source: crate::c_types::derived::COption_FilterZ, mut broadcaster: crate::lightning::chain::chaininterface::BroadcasterInterface, mut logger: crate::lightning::util::logger::Logger, mut feeest: crate::lightning::chain::chaininterface::FeeEstimator, mut persister: crate::lightning::chain::channelmonitor::Persist) -> ChainMonitor { +pub extern "C" fn ChainMonitor_new(mut chain_source: crate::c_types::derived::COption_FilterZ, mut broadcaster: crate::lightning::chain::chaininterface::BroadcasterInterface, mut logger: crate::lightning::util::logger::Logger, mut feeest: crate::lightning::chain::chaininterface::FeeEstimator, mut persister: crate::lightning::chain::chainmonitor::Persist) -> ChainMonitor { let mut local_chain_source = { /* chain_source*/ let chain_source_opt = chain_source; { } if chain_source_opt.is_none() { None } else { Some({ chain_source_opt.take() }) } }; let mut ret = lightning::chain::chainmonitor::ChainMonitor::new(local_chain_source, broadcaster, logger, feeest, persister); ChainMonitor { inner: ObjOps::heap_alloc(ret), is_owned: true } @@ -120,6 +276,31 @@ pub extern "C" fn ChainMonitor_get_claimable_balances(this_arg: &ChainMonitor, m local_ret.into() } +/// Gets the [`LockedChannelMonitor`] for a given funding outpoint, returning an `Err` if no +/// such [`ChannelMonitor`] is currently being monitored for. +/// +/// Note that the result holds a mutex over our monitor set, and should not be held +/// indefinitely. +#[must_use] +#[no_mangle] +pub extern "C" fn ChainMonitor_get_monitor(this_arg: &ChainMonitor, mut funding_txo: crate::lightning::chain::transaction::OutPoint) -> crate::c_types::derived::CResult_LockedChannelMonitorNoneZ { + let mut ret = unsafe { &*ObjOps::untweak_ptr(this_arg.inner) }.get_monitor(*unsafe { Box::from_raw(funding_txo.take_inner()) }); + let mut local_ret = match ret { Ok(mut o) => crate::c_types::CResultTempl::ok( { crate::lightning::chain::chainmonitor::LockedChannelMonitor { inner: ObjOps::heap_alloc(o), is_owned: true } }).into(), Err(mut e) => crate::c_types::CResultTempl::err( { () /*e*/ }).into() }; + local_ret +} + +/// Lists the funding outpoint of each [`ChannelMonitor`] being monitored. +/// +/// Note that [`ChannelMonitor`]s are not removed when a channel is closed as they are always +/// monitoring for on-chain state resolutions. +#[must_use] +#[no_mangle] +pub extern "C" fn ChainMonitor_list_monitors(this_arg: &ChainMonitor) -> crate::c_types::derived::CVec_OutPointZ { + let mut ret = unsafe { &*ObjOps::untweak_ptr(this_arg.inner) }.list_monitors(); + let mut local_ret = Vec::new(); for mut item in ret.drain(..) { local_ret.push( { crate::lightning::chain::transaction::OutPoint { inner: ObjOps::heap_alloc(item), is_owned: true } }); }; + local_ret.into() +} + impl From for crate::lightning::chain::Listen { fn from(obj: nativeChainMonitor) -> Self { let mut rust_obj = ChainMonitor { inner: ObjOps::heap_alloc(obj), is_owned: true }; @@ -216,13 +397,13 @@ pub extern "C" fn ChainMonitor_as_Watch(this_arg: &ChainMonitor) -> crate::light #[must_use] extern "C" fn ChainMonitor_Watch_watch_channel(this_arg: *const c_void, mut funding_outpoint: crate::lightning::chain::transaction::OutPoint, mut monitor: crate::lightning::chain::channelmonitor::ChannelMonitor) -> crate::c_types::derived::CResult_NoneChannelMonitorUpdateErrZ { let mut ret = >::watch_channel(unsafe { &mut *(this_arg as *mut nativeChainMonitor) }, *unsafe { Box::from_raw(funding_outpoint.take_inner()) }, *unsafe { Box::from_raw(monitor.take_inner()) }); - let mut local_ret = match ret { Ok(mut o) => crate::c_types::CResultTempl::ok( { () /*o*/ }).into(), Err(mut e) => crate::c_types::CResultTempl::err( { crate::lightning::chain::channelmonitor::ChannelMonitorUpdateErr::native_into(e) }).into() }; + let mut local_ret = match ret { Ok(mut o) => crate::c_types::CResultTempl::ok( { () /*o*/ }).into(), Err(mut e) => crate::c_types::CResultTempl::err( { crate::lightning::chain::ChannelMonitorUpdateErr::native_into(e) }).into() }; local_ret } #[must_use] extern "C" fn ChainMonitor_Watch_update_channel(this_arg: *const c_void, mut funding_txo: crate::lightning::chain::transaction::OutPoint, mut update: crate::lightning::chain::channelmonitor::ChannelMonitorUpdate) -> crate::c_types::derived::CResult_NoneChannelMonitorUpdateErrZ { let mut ret = >::update_channel(unsafe { &mut *(this_arg as *mut nativeChainMonitor) }, *unsafe { Box::from_raw(funding_txo.take_inner()) }, *unsafe { Box::from_raw(update.take_inner()) }); - let mut local_ret = match ret { Ok(mut o) => crate::c_types::CResultTempl::ok( { () /*o*/ }).into(), Err(mut e) => crate::c_types::CResultTempl::err( { crate::lightning::chain::channelmonitor::ChannelMonitorUpdateErr::native_into(e) }).into() }; + let mut local_ret = match ret { Ok(mut o) => crate::c_types::CResultTempl::ok( { () /*o*/ }).into(), Err(mut e) => crate::c_types::CResultTempl::err( { crate::lightning::chain::ChannelMonitorUpdateErr::native_into(e) }).into() }; local_ret } #[must_use]