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feat: suspense!

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This commit is contained in:
Jonathan Kelley 2022-11-07 22:55:22 -08:00
parent e6c53803a6
commit 203935834d
13 changed files with 219 additions and 205 deletions
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38
packages/core/src/create.rs
View file

@ -188,7 +188,6 @@ impl VirtualDom {
let render_ret = self.run_scope(id);
// shut up about lifetimes please, I know what I'm doing
let render_ret: &mut RenderReturn = unsafe { std::mem::transmute(render_ret) };
match render_ret {
@ -204,53 +203,22 @@ impl VirtualDom {
RenderReturn::Sync(None) => {
let new_id = self.next_element(template);
placeholder.set(Some(new_id));
self.scopes[id.0].placeholder.set(Some(new_id));
mutations.push(AssignId {
id: new_id,
path: &template.template.node_paths[idx][1..],
});
0
}
RenderReturn::Async(fut) => {
let new_id = self.next_element(template);
let scope = self.scope_stack.last().unwrap();
let scope = &self.scopes[scope.0];
let boundary = scope.consume_context::<SuspenseContext>().unwrap();
// try to poll the future once - many times it will be ready immediately or require little to no work
todo!();
// // move up the tree looking for the first suspense boundary
// // our current component can not be a suspense boundary, so we skip it
// for scope_id in self.scope_stack.iter().rev().skip(1) {
// if let Some(fiber) = &mut scope.suspense_boundary {
// // save the fiber leaf onto the fiber itself
// let detached: &mut FiberLeaf<'static> =
// unsafe { std::mem::transmute(fut) };
// // And save the fiber leaf using the placeholder node
// // this way, when we resume the fiber, we just need to "pick up placeholder"
// fiber.futures.insert(
// LeafLocation {
// element: new_id,
// scope: *scope_id,
// },
// detached,
// );
// self.suspended_scopes.insert(*scope_id);
// break;
// }
placeholder.set(Some(new_id));
self.scopes[id.0].placeholder.set(Some(new_id));
mutations.push(AssignId {
id: new_id,
path: &template.template.node_paths[idx][1..],
});
0
}
}

4
packages/core/src/factory.rs
View file

@ -119,7 +119,7 @@ where
fn as_return(self, cx: &'a ScopeState) -> RenderReturn<'a> {
let f: &mut dyn Future<Output = Element<'a>> = cx.bump().alloc(self);
let boxed = unsafe { BumpBox::from_raw(f) };
let pined: Pin<BumpBox<_>> = boxed.into();
let pined: BumpBox<_> = boxed.into();
RenderReturn::Async(pined)
}
}
@ -133,7 +133,7 @@ fn takes_it() {
pub enum RenderReturn<'a> {
Sync(Element<'a>),
Async(Pin<BumpBox<'a, dyn Future<Output = Element<'a>> + 'a>>),
Async(BumpBox<'a, dyn Future<Output = Element<'a>> + 'a>),
}
pub type FiberLeaf<'a> = Pin<BumpBox<'a, dyn Future<Output = Element<'a>> + 'a>>;

58
packages/core/src/nodes.rs
View file

@ -47,6 +47,27 @@ impl<'a> VNode<'a> {
},
})
}
pub fn single_text(
cx: &'a ScopeState,
text: &'static [TemplateNode<'static>],
id: &'static str,
) -> Option<Self> {
Some(VNode {
node_id: Cell::new(ElementId(0)),
key: None,
parent: None,
root_ids: &[],
dynamic_nodes: &[],
dynamic_attrs: &[],
template: Template {
id,
roots: text,
node_paths: &[&[0]],
attr_paths: &[],
},
})
}
}
#[derive(Debug, Clone, Copy)]
@ -62,25 +83,13 @@ impl<'a> std::hash::Hash for Template<'a> {
self.id.hash(state);
}
}
impl Eq for Template<'_> {}
impl PartialEq for Template<'_> {
fn eq(&self, other: &Self) -> bool {
self.id == other.id
}
}
impl Eq for Template<'_> {}
impl PartialOrd for Template<'_> {
fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
self.id.partial_cmp(other.id)
}
}
impl Ord for Template<'_> {
fn cmp(&self, other: &Self) -> std::cmp::Ordering {
self.id.cmp(other.id)
}
}
/// A weird-ish variant of VNodes with way more limited types
#[derive(Debug, Clone, Copy)]
pub enum TemplateNode<'a> {
@ -96,24 +105,17 @@ pub enum TemplateNode<'a> {
}
pub enum DynamicNode<'a> {
// Anything declared in component form
// IE in caps or with underscores
Component {
name: &'static str,
static_props: bool,
props: Cell<*mut dyn AnyProps<'a>>,
placeholder: Cell<Option<ElementId>>,
},
// Comes in with string interpolation or from format_args, include_str, etc
Text {
id: Cell<ElementId>,
value: &'a str,
},
// Anything that's coming in as an iterator
Fragment(&'a [VNode<'a>]),
Placeholder(Cell<ElementId>),
}
@ -153,8 +155,8 @@ impl<'a> std::fmt::Debug for AttributeValue<'a> {
Self::Float(arg0) => f.debug_tuple("Float").field(arg0).finish(),
Self::Int(arg0) => f.debug_tuple("Int").field(arg0).finish(),
Self::Bool(arg0) => f.debug_tuple("Bool").field(arg0).finish(),
Self::Listener(arg0) => f.debug_tuple("Listener").finish(),
Self::Any(arg0) => f.debug_tuple("Any").finish(),
Self::Listener(_) => f.debug_tuple("Listener").finish(),
Self::Any(_) => f.debug_tuple("Any").finish(),
Self::None => write!(f, "None"),
}
}
@ -167,7 +169,7 @@ impl<'a> PartialEq for AttributeValue<'a> {
(Self::Float(l0), Self::Float(r0)) => l0 == r0,
(Self::Int(l0), Self::Int(r0)) => l0 == r0,
(Self::Bool(l0), Self::Bool(r0)) => l0 == r0,
(Self::Listener(l0), Self::Listener(r0)) => true,
(Self::Listener(_), Self::Listener(_)) => true,
(Self::Any(l0), Self::Any(r0)) => l0.any_cmp(*r0),
_ => core::mem::discriminant(self) == core::mem::discriminant(other),
}
@ -186,20 +188,14 @@ impl<'a> AttributeValue<'a> {
_ => return false,
}
}
fn is_listener(&self) -> bool {
matches!(self, AttributeValue::Listener(_))
}
}
pub trait AnyValue {
fn any_cmp(&self, other: &dyn AnyValue) -> bool;
fn our_typeid(&self) -> TypeId;
}
impl<T> AnyValue for T
where
T: PartialEq + Any,
{
impl<T: PartialEq + Any> AnyValue for T {
fn any_cmp(&self, other: &dyn AnyValue) -> bool {
if self.type_id() != other.our_typeid() {
return false;

1
packages/core/src/scheduler/bumpslab.rs Normal file
View file

@ -0,0 +1 @@

4
packages/core/src/scheduler/mod.rs
View file

@ -1,7 +1,9 @@
use slab::Slab;
use std::sync::Arc;
use crate::ScopeId;
mod bumpslab;
mod handle;
mod suspense;
mod task;
@ -9,9 +11,9 @@ mod wait;
mod waker;
pub use handle::*;
use slab::Slab;
pub use suspense::*;
pub use task::*;
pub use waker::RcWake;
/// The type of message that can be sent to the scheduler.
///

65
packages/core/src/scheduler/suspense.rs
View file

@ -1,21 +1,24 @@
use std::{collections::HashSet, rc::Rc};
use std::{
cell::{Cell, RefCell},
collections::HashSet,
pin::Pin,
rc::Rc,
};
use futures_task::{RawWaker, RawWakerVTable, Waker};
use super::{waker::RcWake, SchedulerMsg};
use crate::{innerlude::Mutation, Element, ScopeId};
use futures_task::Waker;
use futures_util::Future;
use crate::{innerlude::Mutation, Element, Scope, ScopeId};
use super::SchedulerMsg;
#[derive(Copy, Clone, PartialEq, Eq, Hash, Debug)]
pub struct SuspenseId(pub usize);
pub type SuspenseContext = Rc<SuspenseBoundary>;
pub type SuspenseContext = Rc<RefCell<SuspenseBoundary>>;
/// Essentially a fiber in React
pub struct SuspenseBoundary {
pub id: ScopeId,
waiting_on: HashSet<SuspenseId>,
mutations: Vec<Mutation<'static>>,
pub waiting_on: HashSet<SuspenseId>,
pub mutations: Vec<Mutation<'static>>,
}
impl SuspenseBoundary {
@ -28,44 +31,24 @@ impl SuspenseBoundary {
}
}
/*
many times the future will be ready every time it's polled, so we can spin on it until it doesnt wake us up immediately
*/
pub struct SuspenseLeaf {
pub id: SuspenseId,
pub scope: ScopeId,
pub scope_id: ScopeId,
pub boundary: ScopeId,
pub tx: futures_channel::mpsc::UnboundedSender<SchedulerMsg>,
pub notified: Cell<bool>,
pub task: *mut dyn Future<Output = Element<'static>>,
}
pub fn make_suspense_waker(task: &SuspenseLeaf) -> Waker {
let raw = RawWaker::new(task as *const SuspenseLeaf as *const _, task_vtable());
unsafe { Waker::from_raw(raw) }
}
fn task_vtable() -> &'static RawWakerVTable {
&RawWakerVTable::new(clone, wake, wake_by_ref, drop_task)
}
unsafe fn clone(data: *const ()) -> RawWaker {
RawWaker::new(data as *const (), task_vtable())
}
unsafe fn wake(data: *const ()) {
wake_by_ref(data);
}
unsafe fn wake_by_ref(data: *const ()) {
let task = &*(data as *const SuspenseLeaf);
task.tx
.unbounded_send(SchedulerMsg::SuspenseNotified(task.id))
.expect("Scheduler should exist");
}
unsafe fn drop_task(_data: *const ()) {
// doesnt do anything
impl RcWake for SuspenseLeaf {
fn wake_by_ref(arc_self: &Rc<Self>) {
if arc_self.notified.get() {
return;
}
arc_self.notified.set(true);
_ = arc_self
.tx
.unbounded_send(SchedulerMsg::SuspenseNotified(arc_self.id));
}
}

5
packages/core/src/scheduler/task.rs
View file

@ -61,11 +61,6 @@ impl HandleInner {
}
}
pub fn make_task_waker(task: Rc<LocalTask>) -> Waker {
let ptr = Rc::into_raw(task).cast::<()>();
super::waker::make_rc_waker(task)
}
impl RcWake for LocalTask {
fn wake_by_ref(arc_self: &Rc<Self>) {
_ = arc_self

62
packages/core/src/scheduler/wait.rs
View file

@ -1,9 +1,13 @@
use futures_task::Context;
use futures_util::{FutureExt, StreamExt};
use crate::{innerlude::make_task_waker, VirtualDom};
use crate::{
factory::RenderReturn,
innerlude::{Mutation, SuspenseContext},
VNode, VirtualDom,
};
use super::SchedulerMsg;
use super::{waker::RcWake, SchedulerMsg, SuspenseLeaf};
impl VirtualDom {
/// Wait for futures internal to the virtualdom
@ -22,7 +26,7 @@ impl VirtualDom {
// attach the waker to itself
// todo: don't make a new waker every time, make it once and then just clone it
let waker = make_task_waker(local_task.clone());
let waker = local_task.waker();
let mut cx = Context::from_waker(&waker);
// safety: the waker owns its task and everythig is single threaded
@ -33,7 +37,57 @@ impl VirtualDom {
}
}
SchedulerMsg::SuspenseNotified(_) => todo!(),
SchedulerMsg::SuspenseNotified(id) => {
let leaf = self
.scheduler
.handle
.leaves
.borrow_mut()
.get(id.0)
.unwrap()
.clone();
let scope_id = leaf.scope_id;
// todo: cache the waker
let waker = leaf.waker();
let mut cx = Context::from_waker(&waker);
let fut = unsafe { &mut *leaf.task };
let mut pinned = unsafe { std::pin::Pin::new_unchecked(fut) };
let as_pinned_mut = &mut pinned;
// the component finished rendering and gave us nodes
// we should attach them to that component and then render its children
// continue rendering the tree until we hit yet another suspended component
if let futures_task::Poll::Ready(new_nodes) = as_pinned_mut.poll_unpin(&mut cx)
{
let boundary = &self.scopes[leaf.boundary.0]
.consume_context::<SuspenseContext>()
.unwrap();
let mut fiber = boundary.borrow_mut();
let scope = &mut self.scopes[scope_id.0];
let arena = scope.current_arena();
let ret = arena.bump.alloc(RenderReturn::Sync(new_nodes));
arena.node.set(ret);
if let RenderReturn::Sync(Some(template)) = ret {
let mutations = &mut fiber.mutations;
let template: &VNode = unsafe { std::mem::transmute(template) };
let mutations: &mut Vec<Mutation> =
unsafe { std::mem::transmute(mutations) };
self.scope_stack.push(scope_id);
self.create(mutations, template);
self.scope_stack.pop();
println!("{:?}", mutations);
}
}
}
}
}
}

78
packages/core/src/scheduler/waker.rs
View file

@ -1,54 +1,36 @@
use std::{
cell::{RefCell, UnsafeCell},
marker::PhantomData,
mem::{self, MaybeUninit},
ops::DerefMut,
pin::Pin,
process::Output,
rc::Rc,
sync::Arc,
};
use futures_task::{RawWaker, RawWakerVTable, Waker};
use std::{mem, rc::Rc};
use futures_task::{waker, RawWaker, RawWakerVTable, Waker};
pub trait RcWake: Sized {
/// Create a waker from this self-wakening object
fn waker(self: &Rc<Self>) -> Waker {
unsafe fn rc_vtable<T: RcWake>() -> &'static RawWakerVTable {
&RawWakerVTable::new(
|data| {
let arc = mem::ManuallyDrop::new(Rc::<T>::from_raw(data.cast::<T>()));
let _rc_clone: mem::ManuallyDrop<_> = arc.clone();
RawWaker::new(data, rc_vtable::<T>())
},
|data| Rc::from_raw(data.cast::<T>()).wake(),
|data| {
let arc = mem::ManuallyDrop::new(Rc::<T>::from_raw(data.cast::<T>()));
RcWake::wake_by_ref(&arc);
},
|data| drop(Rc::<T>::from_raw(data.cast::<T>())),
)
}
unsafe {
Waker::from_raw(RawWaker::new(
Rc::into_raw(self.clone()).cast(),
rc_vtable::<Self>(),
))
}
}
fn wake_by_ref(arc_self: &Rc<Self>);
pub trait RcWake {
fn wake(self: Rc<Self>) {
Self::wake_by_ref(&self)
}
fn wake_by_ref(arc_self: &Rc<Self>);
}
pub fn make_rc_waker<T: RcWake>(rc: Rc<T>) -> Waker {
unsafe { Waker::from_raw(RawWaker::new(Rc::into_raw(rc).cast(), rc_vtable::<T>())) }
}
fn rc_vtable<T: RcWake>() -> &'static RawWakerVTable {
&RawWakerVTable::new(
clone_rc_raw::<T>,
wake_rc_raw::<T>,
wake_by_ref_rc_raw::<T>,
drop_rc_raw::<T>,
)
}
// FIXME: panics on Rc::clone / refcount changes could wreak havoc on the
// code here. We should guard against this by aborting.
unsafe fn clone_rc_raw<T: RcWake>(data: *const ()) -> RawWaker {
let arc = mem::ManuallyDrop::new(Rc::<T>::from_raw(data.cast::<T>()));
let _rc_clone: mem::ManuallyDrop<_> = arc.clone();
RawWaker::new(data, rc_vtable::<T>())
}
unsafe fn wake_rc_raw<T: RcWake>(data: *const ()) {
let arc: Rc<T> = Rc::from_raw(data.cast::<T>());
arc.wake();
}
unsafe fn wake_by_ref_rc_raw<T: RcWake>(data: *const ()) {
let arc = mem::ManuallyDrop::new(Rc::<T>::from_raw(data.cast::<T>()));
arc.wake();
}
unsafe fn drop_rc_raw<T: RcWake>(data: *const ()) {
drop(Rc::<T>::from_raw(data.cast::<T>()))
}

95
packages/core/src/scope_arena.rs
View file

@ -1,14 +1,20 @@
use std::task::Context;
use futures_util::task::noop_waker_ref;
use crate::{innerlude::SuspenseContext, scheduler::RcWake};
use futures_util::{pin_mut, task::noop_waker_ref};
use std::{
mem,
pin::Pin,
rc::Rc,
task::{Context, Poll},
};
use crate::{
any_props::AnyProps,
arena::ElementId,
bump_frame::BumpFrame,
factory::RenderReturn,
innerlude::{SuspenseId, SuspenseLeaf},
scopes::{ScopeId, ScopeState},
virtualdom::VirtualDom, innerlude::SuspenseLeaf,
virtualdom::VirtualDom,
};
impl VirtualDom {
@ -25,6 +31,7 @@ impl VirtualDom {
id,
height,
props,
placeholder: None.into(),
node_arena_1: BumpFrame::new(50),
node_arena_2: BumpFrame::new(50),
render_cnt: Default::default(),
@ -52,46 +59,66 @@ impl VirtualDom {
.and_then(|id| self.scopes.get_mut(id.0).map(|f| f as *mut ScopeState))
}
pub fn run_scope(&mut self, id: ScopeId) -> &mut RenderReturn {
let scope = &mut self.scopes[id.0];
scope.hook_idx.set(0);
pub fn run_scope(&mut self, scope_id: ScopeId) -> &mut RenderReturn {
let mut new_nodes = unsafe {
let scope = &mut self.scopes[scope_id.0];
scope.hook_idx.set(0);
let mut new_nodes = {
let props = unsafe { &mut *scope.props };
let props: &mut dyn AnyProps = unsafe { std::mem::transmute(props) };
let props: &mut dyn AnyProps = mem::transmute(&mut *scope.props);
let res: RenderReturn = props.render(scope);
let res: RenderReturn<'static> = unsafe { std::mem::transmute(res) };
let res: RenderReturn<'static> = mem::transmute(res);
res
};
// immediately resolve futures that can be resolved immediatelys
let res = match &mut new_nodes {
RenderReturn::Sync(_) => new_nodes,
RenderReturn::Async(fut) => {
// use futures_util::FutureExt;
// immediately resolve futures that can be resolved
if let RenderReturn::Async(task) = &mut new_nodes {
use futures_util::FutureExt;
let leaves = self.scheduler.handle.leaves.borrow_mut();
let mut leaves = self.scheduler.handle.leaves.borrow_mut();
let entry = leaves.vacant_entry();
let key = entry.key();
leaves.insert(Rc::new(SuspenseLeaf {
id: todo!(),
scope: todo!(),
boundary: todo!(),
tx: todo!(),
task: todo!(),
}));
let leaf = Rc::new(SuspenseLeaf {
scope_id,
task: task.as_mut(),
id: SuspenseId(key),
tx: self.scheduler.handle.sender.clone(),
boundary: ScopeId(0),
notified: false.into(),
});
let waker = crate::scheduler::make_suspense_waker(task);
let _leaf = leaf.clone();
let waker = leaf.waker();
let mut cx = Context::from_waker(&waker);
let mut pinned = unsafe { Pin::new_unchecked(task.as_mut()) };
match fut.poll_unpin(&mut cx) {
std::task::Poll::Ready(nodes) => {
leaves.remove(key;)
RenderReturn::Sync(nodes)
},
std::task::Poll::Pending => new_nodes,
}
loop {
match pinned.poll_unpin(&mut cx) {
// If nodes are produced, then set it and we can break
Poll::Ready(nodes) => {
new_nodes = RenderReturn::Sync(nodes);
break;
}
// If no nodes are produced but the future woke up immediately, then try polling it again
// This circumvents things like yield_now, but is important is important when rendering
// components that are just a stream of immediately ready futures
_ if _leaf.notified.get() => {
_leaf.notified.set(false);
continue;
}
// If no nodes are produced, then we need to wait for the future to be woken up
// Insert the future into fiber leaves and break
_ => {
entry.insert(leaf);
break;
}
};
}
};
let scope = &mut self.scopes[scope_id.0];
let frame = match scope.render_cnt % 2 {
0 => &mut scope.node_arena_1,
1 => &mut scope.node_arena_2,
@ -99,10 +126,10 @@ impl VirtualDom {
};
// set the head of the bump frame
let alloced = frame.bump.alloc(res);
let alloced = frame.bump.alloc(new_nodes);
frame.node.set(alloced);
// rebind the lifetime now that its stored internally
unsafe { std::mem::transmute(alloced) }
unsafe { mem::transmute(alloced) }
}
}

1
packages/core/src/scopes.rs
View file

@ -72,6 +72,7 @@ pub struct ScopeState {
pub tasks: SchedulerHandle,
pub props: *mut dyn AnyProps<'static>,
pub placeholder: Cell<Option<ElementId>>,
}
impl ScopeState {

6
packages/core/src/virtualdom.rs
View file

@ -13,9 +13,11 @@ use crate::{
};
use crate::{scheduler, Element, Scope};
use futures_channel::mpsc::{UnboundedReceiver, UnboundedSender};
use scheduler::SuspenseContext;
use scheduler::{SuspenseBoundary, SuspenseContext};
use slab::Slab;
use std::cell::RefCell;
use std::collections::{BTreeSet, HashMap};
use std::rc::Rc;
pub struct VirtualDom {
pub(crate) templates: HashMap<TemplateId, Template<'static>>,
@ -47,7 +49,7 @@ impl VirtualDom {
let root = res.new_scope(props);
// the root component is always a suspense boundary for any async children
// res.scopes[root.0].provide_context(SuspenseContext::new(root));
res.scopes[root.0].provide_context(Rc::new(RefCell::new(SuspenseBoundary::new(root))));
assert_eq!(root, ScopeId(0));

7
packages/core/tests/suspend.rs
View file

@ -32,7 +32,10 @@ async fn async_child(cx: Scope<'_>) -> Element {
fut.await;
println!("Future awaited");
println!("Future awaited and complete");
None
let dy = cx.component(async_child, (), "async_child");
VNode::single_component(&cx, dy, "app")
// VNode::single_text(&cx, &[TemplateNode::Text("it works!")], "beauty")
}