1 // This file is Copyright its original authors, visible in version control
2 // history and in the source files from which this was generated.
4 // This file is licensed under the license available in the LICENSE or LICENSE.md
5 // file in the root of this repository or, if no such file exists, the same
6 // license as that which applies to the original source files from which this
7 // source was automatically generated.
9 //! Utilities which allow users to block on some future notification from LDK. These are
10 //! specifically used by [`ChannelManager`] to allow waiting until the [`ChannelManager`] needs to
13 //! [`ChannelManager`]: crate::ln::channelmanager::ChannelManager
15 use alloc::str::FromStr;
16 use alloc::string::String;
17 use core::ffi::c_void;
18 use core::convert::Infallible;
19 use bitcoin::hashes::Hash;
20 use crate::c_types::*;
21 #[cfg(feature="no-std")]
22 use alloc::{vec::Vec, boxed::Box};
24 /// A callback which is called when a [`Future`] completes.
26 /// Note that this MUST NOT call back into LDK directly, it must instead schedule actions to be
27 /// taken later. Rust users should use the [`std::future::Future`] implementation for [`Future`]
30 /// Note that the [`std::future::Future`] implementation may only work for runtimes which schedule
31 /// futures when they receive a wake, rather than immediately executing them.
33 pub struct FutureCallback {
34 /// An opaque pointer which is passed to your function implementations as an argument.
35 /// This has no meaning in the LDK, and can be NULL or any other value.
36 pub this_arg: *mut c_void,
37 /// The method which is called.
38 pub call: extern "C" fn (this_arg: *const c_void),
39 /// Frees any resources associated with this object given its this_arg pointer.
40 /// Does not need to free the outer struct containing function pointers and may be NULL is no resources need to be freed.
41 pub free: Option<extern "C" fn(this_arg: *mut c_void)>,
43 unsafe impl Send for FutureCallback {}
44 unsafe impl Sync for FutureCallback {}
46 pub(crate) fn FutureCallback_clone_fields(orig: &FutureCallback) -> FutureCallback {
48 this_arg: orig.this_arg,
49 call: Clone::clone(&orig.call),
50 free: Clone::clone(&orig.free),
54 use lightning::util::wakers::FutureCallback as rustFutureCallback;
55 impl rustFutureCallback for FutureCallback {
57 (self.call)(self.this_arg)
61 // We're essentially a pointer already, or at least a set of pointers, so allow us to be used
62 // directly as a Deref trait in higher-level structs:
63 impl core::ops::Deref for FutureCallback {
65 fn deref(&self) -> &Self {
69 impl core::ops::DerefMut for FutureCallback {
70 fn deref_mut(&mut self) -> &mut Self {
74 /// Calls the free function if one is set
76 pub extern "C" fn FutureCallback_free(this_ptr: FutureCallback) { }
77 impl Drop for FutureCallback {
79 if let Some(f) = self.free {
85 use lightning::util::wakers::Future as nativeFutureImport;
86 pub(crate) type nativeFuture = nativeFutureImport;
88 /// A simple future which can complete once, and calls some callback(s) when it does so.
92 /// A pointer to the opaque Rust object.
94 /// Nearly everywhere, inner must be non-null, however in places where
95 /// the Rust equivalent takes an Option, it may be set to null to indicate None.
96 pub inner: *mut nativeFuture,
97 /// Indicates that this is the only struct which contains the same pointer.
99 /// Rust functions which take ownership of an object provided via an argument require
100 /// this to be true and invalidate the object pointed to by inner.
104 impl Drop for Future {
106 if self.is_owned && !<*mut nativeFuture>::is_null(self.inner) {
107 let _ = unsafe { Box::from_raw(ObjOps::untweak_ptr(self.inner)) };
111 /// Frees any resources used by the Future, if is_owned is set and inner is non-NULL.
113 pub extern "C" fn Future_free(this_obj: Future) { }
115 /// Used only if an object of this type is returned as a trait impl by a method
116 pub(crate) extern "C" fn Future_free_void(this_ptr: *mut c_void) {
117 let _ = unsafe { Box::from_raw(this_ptr as *mut nativeFuture) };
121 pub(crate) fn get_native_ref(&self) -> &'static nativeFuture {
122 unsafe { &*ObjOps::untweak_ptr(self.inner) }
124 pub(crate) fn get_native_mut_ref(&self) -> &'static mut nativeFuture {
125 unsafe { &mut *ObjOps::untweak_ptr(self.inner) }
127 /// When moving out of the pointer, we have to ensure we aren't a reference, this makes that easy
128 pub(crate) fn take_inner(mut self) -> *mut nativeFuture {
129 assert!(self.is_owned);
130 let ret = ObjOps::untweak_ptr(self.inner);
131 self.inner = core::ptr::null_mut();
135 /// Registers a callback to be called upon completion of this future. If the future has already
136 /// completed, the callback will be called immediately.
138 pub extern "C" fn Future_register_callback_fn(this_arg: &crate::lightning::util::wakers::Future, mut callback: crate::lightning::util::wakers::FutureCallback) {
139 unsafe { &*ObjOps::untweak_ptr(this_arg.inner) }.register_callback_fn(callback)
142 /// Waits until this [`Future`] completes.
144 pub extern "C" fn Future_wait(this_arg: &crate::lightning::util::wakers::Future) {
145 unsafe { &*ObjOps::untweak_ptr(this_arg.inner) }.wait()
148 /// Waits until this [`Future`] completes or the given amount of time has elapsed.
150 /// Returns true if the [`Future`] completed, false if the time elapsed.
153 pub extern "C" fn Future_wait_timeout(this_arg: &crate::lightning::util::wakers::Future, mut max_wait: u64) -> bool {
154 let mut ret = unsafe { &*ObjOps::untweak_ptr(this_arg.inner) }.wait_timeout(core::time::Duration::from_secs(max_wait));
159 use lightning::util::wakers::Sleeper as nativeSleeperImport;
160 pub(crate) type nativeSleeper = nativeSleeperImport;
162 /// A struct which can be used to select across many [`Future`]s at once without relying on a full
167 /// A pointer to the opaque Rust object.
169 /// Nearly everywhere, inner must be non-null, however in places where
170 /// the Rust equivalent takes an Option, it may be set to null to indicate None.
171 pub inner: *mut nativeSleeper,
172 /// Indicates that this is the only struct which contains the same pointer.
174 /// Rust functions which take ownership of an object provided via an argument require
175 /// this to be true and invalidate the object pointed to by inner.
179 impl Drop for Sleeper {
181 if self.is_owned && !<*mut nativeSleeper>::is_null(self.inner) {
182 let _ = unsafe { Box::from_raw(ObjOps::untweak_ptr(self.inner)) };
186 /// Frees any resources used by the Sleeper, if is_owned is set and inner is non-NULL.
188 pub extern "C" fn Sleeper_free(this_obj: Sleeper) { }
190 /// Used only if an object of this type is returned as a trait impl by a method
191 pub(crate) extern "C" fn Sleeper_free_void(this_ptr: *mut c_void) {
192 let _ = unsafe { Box::from_raw(this_ptr as *mut nativeSleeper) };
196 pub(crate) fn get_native_ref(&self) -> &'static nativeSleeper {
197 unsafe { &*ObjOps::untweak_ptr(self.inner) }
199 pub(crate) fn get_native_mut_ref(&self) -> &'static mut nativeSleeper {
200 unsafe { &mut *ObjOps::untweak_ptr(self.inner) }
202 /// When moving out of the pointer, we have to ensure we aren't a reference, this makes that easy
203 pub(crate) fn take_inner(mut self) -> *mut nativeSleeper {
204 assert!(self.is_owned);
205 let ret = ObjOps::untweak_ptr(self.inner);
206 self.inner = core::ptr::null_mut();
210 /// Constructs a new sleeper from one future, allowing blocking on it.
213 pub extern "C" fn Sleeper_from_single_future(future: &crate::lightning::util::wakers::Future) -> crate::lightning::util::wakers::Sleeper {
214 let mut ret = lightning::util::wakers::Sleeper::from_single_future(future.get_native_ref());
215 crate::lightning::util::wakers::Sleeper { inner: ObjOps::heap_alloc(ret), is_owned: true }
218 /// Constructs a new sleeper from two futures, allowing blocking on both at once.
221 pub extern "C" fn Sleeper_from_two_futures(fut_a: &crate::lightning::util::wakers::Future, fut_b: &crate::lightning::util::wakers::Future) -> crate::lightning::util::wakers::Sleeper {
222 let mut ret = lightning::util::wakers::Sleeper::from_two_futures(fut_a.get_native_ref(), fut_b.get_native_ref());
223 crate::lightning::util::wakers::Sleeper { inner: ObjOps::heap_alloc(ret), is_owned: true }
226 /// Constructs a new sleeper on many futures, allowing blocking on all at once.
229 pub extern "C" fn Sleeper_new(mut futures: crate::c_types::derived::CVec_FutureZ) -> crate::lightning::util::wakers::Sleeper {
230 let mut local_futures = Vec::new(); for mut item in futures.into_rust().drain(..) { local_futures.push( { *unsafe { Box::from_raw(item.take_inner()) } }); };
231 let mut ret = lightning::util::wakers::Sleeper::new(local_futures);
232 crate::lightning::util::wakers::Sleeper { inner: ObjOps::heap_alloc(ret), is_owned: true }
235 /// Wait until one of the [`Future`]s registered with this [`Sleeper`] has completed.
237 pub extern "C" fn Sleeper_wait(this_arg: &crate::lightning::util::wakers::Sleeper) {
238 unsafe { &*ObjOps::untweak_ptr(this_arg.inner) }.wait()
241 /// Wait until one of the [`Future`]s registered with this [`Sleeper`] has completed or the
242 /// given amount of time has elapsed. Returns true if a [`Future`] completed, false if the time
246 pub extern "C" fn Sleeper_wait_timeout(this_arg: &crate::lightning::util::wakers::Sleeper, mut max_wait: u64) -> bool {
247 let mut ret = unsafe { &*ObjOps::untweak_ptr(this_arg.inner) }.wait_timeout(core::time::Duration::from_secs(max_wait));