wip: coroutine works basically

packages/hooks/Cargo.toml

@@ -13,6 +13,8 @@ keywords = ["dom", "ui", "gui", "react", "wasm"]
 
 [dependencies]
 dioxus-core = { path = "../../packages/core", version = "^0.1.9" }
+futures-channel = "0.3.21"
+log = { version = "0.4", features = ["release_max_level_off"] }
 
 
 [dev-dependencies]

packages/hooks/src/usecoroutine.rs

@@ -1,13 +1,15 @@
 #![warn(clippy::pedantic)]
 
-use bumpalo::boxed::Box as BumpBox;
 use dioxus_core::exports::bumpalo;
 use dioxus_core::{LazyNodes, ScopeState, TaskId};
+use futures_channel::mpsc::{UnboundedReceiver, UnboundedSender};
+use std::any::Any;
 use std::future::Future;
 use std::{cell::Cell, rc::Rc};
 
 /// Maintain a handle over a future that can be paused, resumed, and canceled.
 ///
+/// This is an upgraded form of use_future with lots of bells-and-whistles.
 ///
 ///
 ///
@@ -23,82 +25,95 @@ use std::{cell::Cell, rc::Rc};
 ///
 ///
 ///
-pub fn use_coroutine<'a, F>(
+///
+pub fn use_coroutine<'a, O: 'static, M: 'static>(
     cx: &'a ScopeState,
-    create_future: impl FnOnce() -> F + 'a,
-) -> UseCoroutine<'a, F>
-where
-    F: Future<Output = ()> + 'static,
-{
-    let state = cx.use_hook(move |_| CoroutineInner {
-        task_id: Cell::new(None),
-        running: std::rc::Rc::default(),
-        run_count: Cell::new(0),
+) -> UseCoroutineBuilder<'a, O, M> {
+    let inner = cx.use_hook(|_| {
+        //
+        UseCoroutine {
+            val: Cell::new(None),
+            rx: Cell::new(None),
+            tx: None,
+        }
     });
 
-    // as an optimization, we use the bump arena to allocate the callback instead of boxes
-    // that way we don't always call the constructor, but it's still efficient
-    // safety: bumpalo is limited in constructing unsized box types, so we have to do it through dynamic dispatch
-    let boxed: BumpBox<'a, dyn FnMut() -> F + 'a> = unsafe {
-        let mut bump = None;
-        cx.render(LazyNodes::new(move |f| {
-            bump.replace(f.bump());
-            f.static_text("")
-        }));
-        let mut slot = Some(create_future);
-        let bump = bump.expect("bump is assigned during render");
-        BumpBox::from_raw(bump.alloc(move || {
-            let inner = slot.take().expect("closure to not be called twice");
-            inner()
-        }))
-    };
+    UseCoroutineBuilder { cx, inner }
+}
+
+pub struct UseCoroutineBuilder<'a, O, M = ()> {
+    cx: &'a ScopeState,
+    inner: &'a mut UseCoroutine<O, M>,
+}
 
-    state.run_count.set(state.run_count.get() + 1);
+impl<'a, O: 'static, M> UseCoroutineBuilder<'a, O, M> {
+    // fn with_channel<I>(self) -> UseCoroutineBuilder<'a, O, I> {
+    //     UseCoroutineBuilder {
+    //         cx: self.cx,
+    //         inner: self.inner,
+    //     }
+    // }
 
-    UseCoroutine {
-        inner: state,
-        create_fut: Cell::new(Some(boxed)),
-        cx,
+    fn build<F: Future<Output = O>>(mut self, f: impl FnOnce() -> F) -> &'a UseCoroutine<O, ()> {
+        todo!()
+    }
+    fn build_channel<F: Future<Output = O>>(
+        mut self,
+        f: impl FnOnce(UnboundedReceiver<M>) -> F,
+    ) -> &'a UseCoroutine<O, M> {
+        todo!()
     }
-}
 
-struct CoroutineInner {
-    running: Rc<Cell<bool>>,
-    task_id: Cell<Option<TaskId>>,
-    run_count: Cell<u32>,
-}
+    pub fn use_dep(mut self) -> Self {
+        self
+    }
 
-pub struct UseCoroutine<'a, F: Future<Output = ()> + 'static> {
-    create_fut: Cell<Option<BumpBox<'a, dyn FnMut() -> F + 'a>>>,
-    inner: &'a CoroutineInner,
-    cx: &'a ScopeState,
-}
+    /// Provide the channel to downstream consumers
+    pub fn provide_context(mut self) -> Self {
+        self
+    }
 
-impl<'a, F: Future<Output = ()> + 'static> UseCoroutine<'a, F> {
-    pub fn auto_start(&self, start: bool) -> &Self {
-        if start && self.inner.run_count.get() == 1 {
-            self.start();
-        }
+    pub fn auto_start(mut self, start: bool) -> Self {
+        // if start && self.inner.run_count.get() == 1 {
+        //     self.start();
+        // }
         self
     }
+}
 
+pub struct UseCoroutine<O, M = ()> {
+    val: Cell<Option<O>>,
+    rx: Cell<Option<UnboundedReceiver<M>>>,
+    tx: Option<UnboundedSender<M>>,
+}
+
+impl<O, M> UseCoroutine<O, M> {
     pub fn is_running(&self) -> bool {
-        self.inner.running.get()
+        false
+        // self.inner.running.get()
     }
 
     pub fn start(&self) {
-        if !self.is_running() {
-            if let Some(mut fut) = self.create_fut.take() {
-                let fut = fut();
-                let ready_handle = self.inner.running.clone();
-
-                let task = self.cx.push_future(async move {
-                    ready_handle.set(true);
-                    fut.await;
-                    ready_handle.set(false);
-                });
-
-                self.inner.task_id.set(Some(task));
+        // if !self.is_running() {
+        //     if let Some(mut fut) = self.create_fut.take() {
+        //         let fut = fut();
+        //         let ready_handle = self.inner.running.clone();
+
+        //         let task = self.cx.push_future(async move {
+        //             ready_handle.set(true);
+        //             fut.await;
+        //             ready_handle.set(false);
+        //         });
+
+        //         self.inner.task_id.set(Some(task));
+        //     }
+        // }
+    }
+
+    pub fn send(&self, msg: M) {
+        if let Some(tx) = self.tx.clone() {
+            if tx.unbounded_send(msg).is_err() {
+                log::error!("Failed to send message");
             }
         }
     }
@@ -121,32 +136,245 @@ mod tests {
     use futures_util::StreamExt;
 
     fn app(cx: Scope) -> Element {
-        let poll_tasks = use_coroutine(&cx, || async {
+        let poll_tasks = use_coroutine(&cx).auto_start(false).build(|| async {
             loop {
                 println!("polling tasks");
             }
         });
 
-        poll_tasks.auto_start(true);
-
         todo!()
     }
 
     fn app_with_channel(cx: Scope) -> Element {
-        let (tx, mut rx) = unbounded();
+        // let poll_tasks = use_coroutine(&cx).build_channel(|mut rx| async move {
+        //     while let Some(msg) = rx.next().await {
+        //         println!("polling tasks: {}", msg);
+        //     }
+        // });
 
-        let tx = cx.use_hook(|_| tx);
+        let poll_tasks =
+            use_coroutine(&cx).build_channel(|mut rx: UnboundedReceiver<()>| async move {
+                while let Some(msg) = rx.next().await {
+                    println!("polling tasks: {:?}", msg);
+                }
+            });
 
-        let poll_tasks = use_coroutine(&cx, move || async move {
-            while let Some(msg) = rx.next().await {
-                println!("polling tasks: {}", msg);
-            }
-        });
+        // poll_tasks.send(10);
+
+        todo!()
+    }
+}
+
+mod use2 {
+    #![allow(missing_docs)]
+
+    use dioxus_core::{ScopeState, TaskId};
+    use std::{
+        any::Any,
+        cell::{Cell, RefCell},
+        future::Future,
+        rc::Rc,
+    };
+
+    /// A future that resolves to a value.
+    ///
+    /// This runs the future only once - though the future may be regenerated
+    /// through the [`UseFuture::restart`] method.
+    ///
+    /// This is commonly used for components that cannot be rendered until some
+    /// asynchronous operation has completed.
+    ///
+    ///
+    ///
+    ///
+    ///
+    pub fn use_future<'a>(
+        // pub fn use_future<'a, T: 'static, F: Future<Output = T> + 'static>(
+        cx: &'a ScopeState,
+    ) -> &'a UseFuture<()> {
+        //     let state = cx.use_hook(move |_| UseFuture {
+        //         update: cx.schedule_update(),
+        //         needs_regen: Cell::new(true),
+        //         slot: Rc::new(Cell::new(None)),
+        //         value: None,
+        //         task: None,
+        //         pending: true,
+        //         dep_cont: Cell::new(0),
+        //         deps: RefCell::new(Vec::new()),
+        //         first_time: true,
+        //     });
+
+        //     if let Some(value) = state.slot.take() {
+        //         state.value = Some(value);
+        //         state.task = None;
+        //     }
+
+        //     if state.needs_regen.get() {
+        //         // We don't need regen anymore
+        //         state.needs_regen.set(false);
+        //         state.pending = false;
+
+        //         // Create the new future
+        //         let fut = new_fut();
 
-        poll_tasks.auto_start(true);
+        //         // Clone in our cells
+        //         let slot = state.slot.clone();
+        //         let updater = state.update.clone();
 
-        tx.unbounded_send("asd").unwrap();
+        //         state.task = Some(cx.push_future(async move {
+        //             let res = fut.await;
+        //             slot.set(Some(res));
+        //             updater();
+        //         }));
+        //     }
+
+        //     state.first_time = false;
+
+        //     state
+
+        // new_fut: impl FnOnce() -> F,
 
         todo!()
     }
+
+    pub enum FutureState<'a, T> {
+        Pending,
+        Complete(&'a T),
+        Regenerating(&'a T), // the old value
+    }
+
+    pub struct UseFuture<T> {
+        update: Rc<dyn Fn()>,
+        needs_regen: Cell<bool>,
+        value: Option<T>,
+        pending: bool,
+        slot: Rc<Cell<Option<T>>>,
+        task: Option<TaskId>,
+        deps: RefCell<Vec<Box<dyn Any>>>,
+        dep_cont: Cell<usize>,
+        first_time: bool,
+    }
+
+    impl<T> UseFuture<T> {
+        pub fn restart(&self) {
+            self.needs_regen.set(true);
+            (self.update)();
+        }
+
+        // clears the value in the future slot without starting the future over
+        pub fn clear(&self) -> Option<T> {
+            (self.update)();
+            self.slot.replace(None)
+        }
+
+        // Manually set the value in the future slot without starting the future over
+        pub fn set(&self, new_value: T) {
+            self.slot.set(Some(new_value));
+            self.needs_regen.set(true);
+            (self.update)();
+        }
+
+        pub fn value(&self) -> Option<&T> {
+            self.value.as_ref()
+        }
+
+        pub fn state(&self) -> FutureState<T> {
+            // self.value.as_ref()
+            FutureState::Pending
+        }
+
+        /// Add this value to the dependency list
+        ///
+        /// This is a hook and should be called during the initial hook process.
+        /// It should •not• be called in a conditional.
+        pub fn use_dep<F: 'static + PartialEq + Clone>(&self, dependency: &F) -> &Self {
+            let count = self.dep_cont.get();
+            let mut deps = self.deps.borrow_mut();
+
+            match deps.get_mut(count) {
+                Some(dep) => match dep.downcast_mut::<F>() {
+                    Some(saved_dep) => {
+                        if dependency != saved_dep {
+                            *saved_dep = dependency.clone();
+                            self.needs_regen.set(true);
+                        }
+                    }
+                    None => {
+                        if cfg!(debug_assertions) {
+                            panic!("Tried to use a dependency for use_future outside of the use_future hook.");
+                        }
+                    }
+                },
+                None => deps.push(Box::new(dependency.to_owned())),
+            }
+
+            self
+        }
+
+        pub fn restart_if(&self, f: impl FnOnce() -> bool) -> &Self {
+            self
+        }
+
+        pub fn build<F>(&self, new_fut: impl FnOnce() -> F) {}
+    }
+
+    #[test]
+    fn test_use_future_deps() {
+        use dioxus_core::prelude::*;
+
+        struct MyProps {
+            val: String,
+            name: i32,
+        }
+
+        fn app(cx: Scope<MyProps>) -> Element {
+            let MyProps { val, name } = cx.props;
+
+            // let val = use_c(&cx)
+            //     .use_dep(val)
+            //     .restart_if(|| false)
+            //     .use_dep(name)
+            //     .build(|(val, name)| async move {});
+
+            // async fn fetch_thing(name: String, num: i32) -> String {
+            //     format!("{} {}", name, num)
+            // }
+
+            // let val = use_future(&cx, || fetch_thing(val.clone(), *name))
+            //     .with_dep(val)
+            //     .with_dep(name)
+            //     .restart_if(|| false);
+
+            None
+        }
+    }
+
+    // pub struct CoroutineBuilder<'a, const PARAM: usize> {
+    //     deps: Vec<Box<dyn Any>>,
+    //     cx: &'a ScopeState,
+    // }
+
+    // macro_rules! dep_impl {
+    //     ($id1:literal to $id2:literal) => {
+    //         impl<'a> CoroutineBuilder<'a, $id1> {
+    //             pub fn use_dep<F: 'static + PartialEq + Clone>(
+    //                 mut self,
+    //                 dep: &F,
+    //             ) -> CoroutineBuilder<'a, $id2> {
+    //                 self.deps.push(Box::new(dep.clone()));
+    //                 unsafe { std::mem::transmute(self) }
+    //             }
+    //         }
+    //     };
+    // }
+
+    // dep_impl!(0 to 1);
+    // dep_impl!(1 to 2);
+    // dep_impl!(2 to 3);
+    // dep_impl!(3 to 4);
+    // dep_impl!(4 to 5);
+    // dep_impl!(5 to 6);
+    // dep_impl!(6 to 7);
+    // dep_impl!(7 to 8);
+    // dep_impl!(8 to 9);
 }