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refactor to allow rendering Resource directly in view

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This commit is contained in:
Greg Johnston 2024-06-08 11:43:54 -04:00
parent 914b07491e
commit 3c39674622
11 changed files with 361 additions and 505 deletions
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2
leptos/Cargo.toml
View file

@ -18,7 +18,7 @@ hydration_context = { workspace = true }
either_of = { workspace = true }
leptos_dom = { workspace = true }
leptos_macro = { workspace = true }
leptos_server = { workspace = true }
leptos_server = { workspace = true, features = ["tachys"] }
leptos_config = { workspace = true }
leptos-spin-macro = { version = "0.1", optional = true }
oco_ref = { workspace = true }

1
leptos/src/lib.rs
View file

@ -150,7 +150,6 @@ extern crate self as leptos;
pub mod prelude {
// Traits
// These should always be exported from the prelude
pub use crate::suspense_component::FutureViewExt;
pub use reactive_graph::prelude::*;
pub use tachys::prelude::*;

215
leptos/src/suspense_component.rs
View file

@ -212,7 +212,8 @@ where
// out-of-order streams immediately push fallback,
// wrapped by suspense markers
if OUT_OF_ORDER {
buf.push_fallback(self.fallback, position);
let mut fallback_position = *position;
buf.push_fallback(self.fallback, &mut fallback_position);
buf.push_async_out_of_order(
false, /* TODO should_block */ fut, position,
);
@ -266,215 +267,3 @@ where
.hydrate::<FROM_SERVER>(cursor, position)
}
}
pub trait FutureViewExt: Sized {
fn wait(self) -> Suspend<Self>
where
Self: Future,
{
Suspend(self)
}
}
impl<F> FutureViewExt for F where F: Future + Sized {}
/* // TODO remove in favor of Suspend()?
#[macro_export]
macro_rules! suspend {
($fut:expr) => {
move || $crate::prelude::FutureViewExt::wait(async move { $fut })
};
}*/
pub struct Suspend<Fut>(pub Fut);
impl<Fut> Debug for Suspend<Fut> {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
f.debug_struct("Suspend").finish()
}
}
pub struct SuspendState<T, Rndr>
where
T: Render<Rndr>,
Rndr: Renderer,
{
inner: Rc<RefCell<OptionState<T::State, Rndr>>>,
}
impl<T, Rndr> Mountable<Rndr> for SuspendState<T, Rndr>
where
T: Render<Rndr>,
Rndr: Renderer,
{
fn unmount(&mut self) {
self.inner.borrow_mut().unmount();
}
fn mount(&mut self, parent: &Rndr::Element, marker: Option<&Rndr::Node>) {
self.inner.borrow_mut().mount(parent, marker);
}
fn insert_before_this(
&self,
parent: &Rndr::Element,
child: &mut dyn Mountable<Rndr>,
) -> bool {
self.inner.borrow_mut().insert_before_this(parent, child)
}
}
impl<Fut, Rndr> Render<Rndr> for Suspend<Fut>
where
Fut: Future + 'static,
Fut::Output: Render<Rndr>,
Rndr: Renderer + 'static,
{
type State = SuspendState<Fut::Output, Rndr>;
// TODO cancelation if it fires multiple times
fn build(self) -> Self::State {
// poll the future once immediately
// if it's already available, start in the ready state
// otherwise, start with the fallback
let mut fut = Box::pin(ScopedFuture::new(self.0));
let initial = fut.as_mut().now_or_never();
let initially_pending = initial.is_none();
let inner = Rc::new(RefCell::new(initial.build()));
// get a unique ID if there's a SuspenseContext
let id = use_context::<SuspenseContext>().map(|sc| sc.task_id());
// if the initial state was pending, spawn a future to wait for it
// spawning immediately means that our now_or_never poll result isn't lost
// if it wasn't pending at first, we don't need to poll the Future again
if initially_pending {
Executor::spawn_local({
let state = Rc::clone(&inner);
async move {
let value = fut.as_mut().await;
drop(id);
Some(value).rebuild(&mut *state.borrow_mut());
}
});
}
SuspendState { inner }
}
fn rebuild(self, state: &mut Self::State) {
// get a unique ID if there's a SuspenseContext
let fut = ScopedFuture::new(self.0);
let id = use_context::<SuspenseContext>().map(|sc| sc.task_id());
// spawn the future, and rebuild the state when it resolves
Executor::spawn_local({
let state = Rc::clone(&state.inner);
async move {
let value = fut.await;
drop(id);
Some(value).rebuild(&mut *state.borrow_mut());
}
});
}
}
impl<Fut, Rndr> AddAnyAttr<Rndr> for Suspend<Fut>
where
Fut: Future + Send + 'static,
Fut::Output: AddAnyAttr<Rndr>,
Rndr: Renderer + 'static,
{
type Output<SomeNewAttr: Attribute<Rndr>> = Suspend<
Pin<
Box<
dyn Future<
Output = <Fut::Output as AddAnyAttr<Rndr>>::Output<
SomeNewAttr::CloneableOwned,
>,
> + Send,
>,
>,
>;
fn add_any_attr<NewAttr: Attribute<Rndr>>(
self,
attr: NewAttr,
) -> Self::Output<NewAttr>
where
Self::Output<NewAttr>: RenderHtml<Rndr>,
{
let attr = attr.into_cloneable_owned();
Suspend(Box::pin(async move {
let this = self.0.await;
this.add_any_attr(attr)
}))
}
}
impl<Fut, Rndr> RenderHtml<Rndr> for Suspend<Fut>
where
Fut: Future + Send + 'static,
Fut::Output: RenderHtml<Rndr>,
Rndr: Renderer + 'static,
{
type AsyncOutput = Option<Fut::Output>;
const MIN_LENGTH: usize = Fut::Output::MIN_LENGTH;
fn to_html_with_buf(self, _buf: &mut String, _position: &mut Position) {
todo!()
}
fn to_html_async_with_buf<const OUT_OF_ORDER: bool>(
self,
_buf: &mut StreamBuilder,
_position: &mut Position,
) where
Self: Sized,
{
todo!();
}
// TODO cancellation
fn hydrate<const FROM_SERVER: bool>(
self,
cursor: &Cursor<Rndr>,
position: &PositionState,
) -> Self::State {
// poll the future once immediately
// if it's already available, start in the ready state
// otherwise, start with the fallback
let mut fut = Box::pin(ScopedFuture::new(self.0));
let initial = fut.as_mut().now_or_never();
let initially_pending = initial.is_none();
let inner = Rc::new(RefCell::new(
initial.hydrate::<FROM_SERVER>(cursor, position),
));
// get a unique ID if there's a SuspenseContext
let id = use_context::<SuspenseContext>().map(|sc| sc.task_id());
// if the initial state was pending, spawn a future to wait for it
// spawning immediately means that our now_or_never poll result isn't lost
// if it wasn't pending at first, we don't need to poll the Future again
if initially_pending {
Executor::spawn_local({
let state = Rc::clone(&inner);
async move {
let value = fut.as_mut().await;
drop(id);
Some(value).rebuild(&mut *state.borrow_mut());
}
});
}
SuspendState { inner }
}
async fn resolve(self) -> Self::AsyncOutput {
Some(self.0.await)
}
fn dry_resolve(&mut self) {}
}

3
leptos_server/Cargo.toml
View file

@ -20,6 +20,8 @@ tracing = { version = "0.1", optional = true }
#inventory = "0.3"
futures = "0.3"
tachys = { workspace = true, optional = true, features = ["reactive_graph"] }
# serialization formats
serde = { version = "1"}
serde-wasm-bindgen = { version = "0.6", optional = true }
@ -45,6 +47,7 @@ default-tls = ["server_fn/default-tls"]
rustls = ["server_fn/rustls"]
rkyv = ["dep:rkyv", "dep:base64"]
serde-wasm-bindgen = ["dep:serde-wasm-bindgen", "dep:js-sys", "dep:wasm-bindgen"]
tachys = ["dep:tachys"]
tracing = ["dep:tracing"]
[package.metadata.cargo-all-features]

109
leptos_server/src/lib.rs
View file

@ -128,3 +128,112 @@ pub use resource::*;
//pub use action::*;
//pub use multi_action::*;
//extern crate tracing;
#[cfg(feature = "tachys")]
mod view_implementations {
use crate::Resource;
use reactive_graph::traits::Read;
use std::{future::Future, pin::Pin};
use tachys::{
html::attribute::Attribute,
hydration::Cursor,
reactive_graph::{RenderEffectState, Suspend, SuspendState},
renderer::Renderer,
ssr::StreamBuilder,
view::{
add_attr::AddAnyAttr, Position, PositionState, Render, RenderHtml,
},
};
impl<T, R, Ser> Render<R> for Resource<T, Ser>
where
T: Render<R> + Send + Sync + Clone,
Ser: Send + 'static,
R: Renderer,
{
type State = RenderEffectState<SuspendState<T, R>>;
fn build(self) -> Self::State {
(move || Suspend(async move { self.await })).build()
}
fn rebuild(self, state: &mut Self::State) {
(move || Suspend(async move { self.await })).rebuild(state)
}
}
impl<T, R, Ser> AddAnyAttr<R> for Resource<T, Ser>
where
T: RenderHtml<R> + Send + Sync + Clone,
Ser: Send + 'static,
R: Renderer,
{
type Output<SomeNewAttr: Attribute<R>> = Box<
dyn FnMut() -> Suspend<
Pin<
Box<
dyn Future<
Output = <T as AddAnyAttr<R>>::Output<
<SomeNewAttr::CloneableOwned as Attribute<R>>::CloneableOwned,
>,
> + Send,
>,
>,
> + Send,
>;
fn add_any_attr<NewAttr: Attribute<R>>(
self,
attr: NewAttr,
) -> Self::Output<NewAttr>
where
Self::Output<NewAttr>: RenderHtml<R>,
{
(move || Suspend(async move { self.await })).add_any_attr(attr)
}
}
impl<T, R, Ser> RenderHtml<R> for Resource<T, Ser>
where
T: RenderHtml<R> + Send + Sync + Clone,
Ser: Send + 'static,
R: Renderer,
{
type AsyncOutput = Option<T>;
const MIN_LENGTH: usize = 0;
fn dry_resolve(&mut self) {
self.read();
}
fn resolve(self) -> impl Future<Output = Self::AsyncOutput> + Send {
(move || Suspend(async move { self.await })).resolve()
}
fn to_html_with_buf(self, buf: &mut String, position: &mut Position) {
(move || Suspend(async move { self.await }))
.to_html_with_buf(buf, position);
}
fn to_html_async_with_buf<const OUT_OF_ORDER: bool>(
self,
buf: &mut StreamBuilder,
position: &mut Position,
) where
Self: Sized,
{
(move || Suspend(async move { self.await }))
.to_html_async_with_buf::<OUT_OF_ORDER>(buf, position);
}
fn hydrate<const FROM_SERVER: bool>(
self,
cursor: &Cursor<R>,
position: &PositionState,
) -> Self::State {
(move || Suspend(async move { self.await }))
.hydrate::<FROM_SERVER>(cursor, position)
}
}
}

13
reactive_graph/src/owner.rs
View file

@ -201,7 +201,7 @@ impl Owner {
self.inner.cleanup();
}
/// Registers a function to be run the next time this owner is cleaned up.
/// Registers a function to be run the next time the current owner is cleaned up.
///
/// Because the ownership model is associated with reactive nodes, each "decision point" in an
/// application tends to have a separate `Owner`: as a result, these cleanup functions often
@ -263,6 +263,17 @@ impl Owner {
}
}
/// Registers a function to be run the next time the current owner is cleaned up.
///
/// Because the ownership model is associated with reactive nodes, each "decision point" in an
/// application tends to have a separate `Owner`: as a result, these cleanup functions often
/// fill the same need as an "on unmount" function in other UI approaches, etc.
///
/// This is an alias for [`Owner::on_cleanup`].
pub fn on_cleanup(fun: impl FnOnce() + Send + Sync + 'static) {
Owner::on_cleanup(fun)
}
#[derive(Default)]
pub(crate) struct OwnerInner {
pub parent: Option<Weak<RwLock<OwnerInner>>>,

287
tachys/src/async_views/mod.rs
View file

@ -1,287 +0,0 @@
use crate::{
html::attribute::Attribute,
hydration::Cursor,
renderer::Renderer,
ssr::StreamBuilder,
view::{
add_attr::AddAnyAttr, either::EitherState, Mountable, Position,
PositionState, Render, RenderHtml,
},
};
use any_spawner::Executor;
use either_of::Either;
use futures::FutureExt;
use parking_lot::RwLock;
use std::{fmt::Debug, future::Future, sync::Arc};
pub trait FutureViewExt: Sized {
fn suspend(self) -> Suspend<false, (), Self>
where
Self: Future,
{
Suspend {
fallback: (),
fut: self,
}
}
}
impl<F> FutureViewExt for F where F: Future + Sized {}
pub struct Suspend<const TRANSITION: bool, Fal, Fut> {
pub fallback: Fal,
pub fut: Fut,
}
impl<const TRANSITION: bool, Fal, Fut> Suspend<TRANSITION, Fal, Fut> {
pub fn with_fallback<Fal2>(
self,
fallback: Fal2,
) -> Suspend<TRANSITION, Fal2, Fut> {
let fut = self.fut;
Suspend { fallback, fut }
}
pub fn transition(self) -> Suspend<true, Fal, Fut> {
let Suspend { fallback, fut } = self;
Suspend { fallback, fut }
}
}
impl<const TRANSITION: bool, Fal, Fut> Debug for Suspend<TRANSITION, Fal, Fut> {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
f.debug_struct("SuspendedFuture")
.field("transition", &TRANSITION)
.finish()
}
}
// TODO make this cancelable
impl<const TRANSITION: bool, Fal, Fut, Rndr> Render<Rndr>
for Suspend<TRANSITION, Fal, Fut>
where
Fal: Render<Rndr> + 'static,
Fut: Future + 'static,
Fut::Output: Render<Rndr>,
Rndr: Renderer + 'static,
{
type State = Arc<
RwLock<
EitherState<Fal::State, <Fut::Output as Render<Rndr>>::State, Rndr>,
>,
>;
// TODO fallible state/error
fn build(self) -> Self::State {
// poll the future once immediately
// if it's already available, start in the ready state
// otherwise, start with the fallback
let mut fut = Box::pin(self.fut);
let initial = match fut.as_mut().now_or_never() {
Some(resolved) => Either::Right(resolved),
None => Either::Left(self.fallback),
};
// store whether this was pending at first
// by the time we need to know, we will have consumed `initial`
let initially_pending = matches!(initial, Either::Left(_));
// now we can build the initial state
let state = Arc::new(RwLock::new(initial.build()));
// if the initial state was pending, spawn a future to wait for it
// spawning immediately means that our now_or_never poll result isn't lost
// if it wasn't pending at first, we don't need to poll the Future again
if initially_pending {
Executor::spawn_local({
let state = Arc::clone(&state);
async move {
let value = fut.as_mut().await;
Either::<Fal, Fut::Output>::Right(value)
.rebuild(&mut *state.write());
}
});
}
state
}
fn rebuild(self, state: &mut Self::State) {
if !TRANSITION {
// fall back to fallback state
Either::<Fal, Fut::Output>::Left(self.fallback)
.rebuild(&mut *state.write());
}
// spawn the future, and rebuild the state when it resolves
Executor::spawn_local({
let state = Arc::clone(state);
async move {
let value = self.fut.await;
Either::<Fal, Fut::Output>::Right(value)
.rebuild(&mut *state.write());
}
});
}
}
impl<const TRANSITION: bool, Fal, Fut, Rndr> AddAnyAttr<Rndr>
for Suspend<TRANSITION, Fal, Fut>
where
Fal: RenderHtml<Rndr> + 'static,
Fut: Future + Send + 'static,
Fut::Output: RenderHtml<Rndr> + Send,
Rndr: Renderer + 'static,
{
type Output<SomeNewAttr: Attribute<Rndr>> = Self;
fn add_any_attr<NewAttr: Attribute<Rndr>>(
self,
_attr: NewAttr,
) -> Self::Output<NewAttr>
where
Self::Output<NewAttr>: RenderHtml<Rndr>,
{
todo!()
}
}
impl<const TRANSITION: bool, Fal, Fut, Rndr> RenderHtml<Rndr>
for Suspend<TRANSITION, Fal, Fut>
where
Fal: RenderHtml<Rndr> + 'static,
Fut: Future + Send + 'static,
Fut::Output: RenderHtml<Rndr> + Send,
Rndr: Renderer + 'static,
{
type AsyncOutput = Fut::Output;
const MIN_LENGTH: usize = Fal::MIN_LENGTH;
fn dry_resolve(&mut self) {}
fn resolve(self) -> impl Future<Output = Self::AsyncOutput> + Send {
self.fut
}
fn to_html_with_buf(self, buf: &mut String, position: &mut Position) {
Either::<Fal, Fut::Output>::Left(self.fallback)
.to_html_with_buf(buf, position);
}
fn to_html_async_with_buf<const OUT_OF_ORDER: bool>(
self,
buf: &mut StreamBuilder,
position: &mut Position,
) where
Self: Sized,
{
buf.next_id();
let mut fut = Box::pin(self.fut);
match fut.as_mut().now_or_never() {
Some(resolved) => {
Either::<Fal, Fut::Output>::Right(resolved)
.to_html_async_with_buf::<OUT_OF_ORDER>(buf, position);
}
None => {
let id = buf.clone_id();
// out-of-order streams immediately push fallback,
// wrapped by suspense markers
if OUT_OF_ORDER {
buf.push_fallback(self.fallback, position);
buf.push_async_out_of_order(
false, /* TODO should_block */ fut, position,
);
} else {
buf.push_async(
false, // TODO should_block
{
let mut position = *position;
async move {
let value = fut.await;
let mut builder = StreamBuilder::new(id);
Either::<Fal, Fut::Output>::Right(value)
.to_html_async_with_buf::<OUT_OF_ORDER>(
&mut builder,
&mut position,
);
builder.finish().take_chunks()
}
},
);
*position = Position::NextChild;
}
}
};
}
fn hydrate<const FROM_SERVER: bool>(
self,
cursor: &Cursor<Rndr>,
position: &PositionState,
) -> Self::State {
// poll the future once immediately
// if it's already available, start in the ready state
// otherwise, start with the fallback
let mut fut = Box::pin(self.fut);
let initial = match fut.as_mut().now_or_never() {
Some(resolved) => Either::Right(resolved),
None => Either::Left(self.fallback),
};
// store whether this was pending at first
// by the time we need to know, we will have consumed `initial`
let initially_pending = matches!(initial, Either::Left(_));
// now we can build the initial state
let state = Arc::new(RwLock::new(
initial.hydrate::<FROM_SERVER>(cursor, position),
));
// if the initial state was pending, spawn a future to wait for it
// spawning immediately means that our now_or_never poll result isn't lost
// if it wasn't pending at first, we don't need to poll the Future again
if initially_pending {
Executor::spawn_local({
let state = Arc::clone(&state);
async move {
let value = fut.as_mut().await;
Either::<Fal, Fut::Output>::Right(value)
.rebuild(&mut *state.write());
}
});
}
state
}
}
impl<Rndr, Fal, Output> Mountable<Rndr>
for Arc<RwLock<EitherState<Fal, Output, Rndr>>>
where
Fal: Mountable<Rndr>,
Output: Mountable<Rndr>,
Rndr: Renderer,
{
fn unmount(&mut self) {
self.write().unmount();
}
fn mount(
&mut self,
parent: &<Rndr as Renderer>::Element,
marker: Option<&<Rndr as Renderer>::Node>,
) {
self.write().mount(parent, marker);
}
fn insert_before_this(
&self,
parent: &<Rndr as Renderer>::Element,
child: &mut dyn Mountable<Rndr>,
) -> bool {
self.write().insert_before_this(parent, child)
}
}

4
tachys/src/lib.rs
View file

@ -2,8 +2,9 @@
#![cfg_attr(feature = "nightly", feature(adt_const_params))]
pub mod prelude {
#[cfg(feature = "reactive_graph")]
pub use crate::reactive_graph::FutureViewExt;
pub use crate::{
async_views::FutureViewExt,
html::{
attribute::{
aria::AriaAttributes,
@ -27,7 +28,6 @@ pub mod prelude {
use wasm_bindgen::JsValue;
use web_sys::Node;
pub mod async_views;
pub mod dom;
pub mod html;
pub mod hydration;

2
tachys/src/reactive_graph/mod.rs
View file

@ -18,7 +18,9 @@ pub mod node_ref;
mod owned;
mod property;
mod style;
mod suspense;
pub use owned::*;
pub use suspense::*;
impl<F, V> ToTemplate for F
where

229
tachys/src/reactive_graph/suspense.rs Normal file
View file

@ -0,0 +1,229 @@
use crate::{
html::attribute::Attribute,
hydration::Cursor,
renderer::Renderer,
ssr::StreamBuilder,
view::{
add_attr::AddAnyAttr, iterators::OptionState, Mountable, Position,
PositionState, Render, RenderHtml,
},
};
use any_spawner::Executor;
use futures::FutureExt;
use reactive_graph::{
computed::{suspense::SuspenseContext, ScopedFuture},
owner::use_context,
};
use std::{cell::RefCell, fmt::Debug, future::Future, pin::Pin, rc::Rc};
pub trait FutureViewExt: Sized {
fn wait(self) -> Suspend<Self>
where
Self: Future,
{
Suspend(self)
}
}
impl<F> FutureViewExt for F where F: Future + Sized {}
/* // TODO remove in favor of Suspend()?
#[macro_export]
macro_rules! suspend {
($fut:expr) => {
move || $crate::prelude::FutureViewExt::wait(async move { $fut })
};
}*/
pub struct Suspend<Fut>(pub Fut);
impl<Fut> Debug for Suspend<Fut> {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
f.debug_struct("Suspend").finish()
}
}
pub struct SuspendState<T, Rndr>
where
T: Render<Rndr>,
Rndr: Renderer,
{
inner: Rc<RefCell<OptionState<T::State, Rndr>>>,
}
impl<T, Rndr> Mountable<Rndr> for SuspendState<T, Rndr>
where
T: Render<Rndr>,
Rndr: Renderer,
{
fn unmount(&mut self) {
self.inner.borrow_mut().unmount();
}
fn mount(&mut self, parent: &Rndr::Element, marker: Option<&Rndr::Node>) {
self.inner.borrow_mut().mount(parent, marker);
}
fn insert_before_this(
&self,
parent: &Rndr::Element,
child: &mut dyn Mountable<Rndr>,
) -> bool {
self.inner.borrow_mut().insert_before_this(parent, child)
}
}
impl<Fut, Rndr> Render<Rndr> for Suspend<Fut>
where
Fut: Future + 'static,
Fut::Output: Render<Rndr>,
Rndr: Renderer + 'static,
{
type State = SuspendState<Fut::Output, Rndr>;
// TODO cancelation if it fires multiple times
fn build(self) -> Self::State {
// poll the future once immediately
// if it's already available, start in the ready state
// otherwise, start with the fallback
let mut fut = Box::pin(ScopedFuture::new(self.0));
let initial = fut.as_mut().now_or_never();
let initially_pending = initial.is_none();
let inner = Rc::new(RefCell::new(initial.build()));
// get a unique ID if there's a SuspenseContext
let id = use_context::<SuspenseContext>().map(|sc| sc.task_id());
// if the initial state was pending, spawn a future to wait for it
// spawning immediately means that our now_or_never poll result isn't lost
// if it wasn't pending at first, we don't need to poll the Future again
if initially_pending {
Executor::spawn_local({
let state = Rc::clone(&inner);
async move {
let value = fut.as_mut().await;
drop(id);
Some(value).rebuild(&mut *state.borrow_mut());
}
});
}
SuspendState { inner }
}
fn rebuild(self, state: &mut Self::State) {
// get a unique ID if there's a SuspenseContext
let fut = ScopedFuture::new(self.0);
let id = use_context::<SuspenseContext>().map(|sc| sc.task_id());
// spawn the future, and rebuild the state when it resolves
Executor::spawn_local({
let state = Rc::clone(&state.inner);
async move {
let value = fut.await;
drop(id);
Some(value).rebuild(&mut *state.borrow_mut());
}
});
}
}
impl<Fut, Rndr> AddAnyAttr<Rndr> for Suspend<Fut>
where
Fut: Future + Send + 'static,
Fut::Output: AddAnyAttr<Rndr>,
Rndr: Renderer + 'static,
{
type Output<SomeNewAttr: Attribute<Rndr>> = Suspend<
Pin<
Box<
dyn Future<
Output = <Fut::Output as AddAnyAttr<Rndr>>::Output<
SomeNewAttr::CloneableOwned,
>,
> + Send,
>,
>,
>;
fn add_any_attr<NewAttr: Attribute<Rndr>>(
self,
attr: NewAttr,
) -> Self::Output<NewAttr>
where
Self::Output<NewAttr>: RenderHtml<Rndr>,
{
let attr = attr.into_cloneable_owned();
Suspend(Box::pin(async move {
let this = self.0.await;
this.add_any_attr(attr)
}))
}
}
impl<Fut, Rndr> RenderHtml<Rndr> for Suspend<Fut>
where
Fut: Future + Send + 'static,
Fut::Output: RenderHtml<Rndr>,
Rndr: Renderer + 'static,
{
type AsyncOutput = Option<Fut::Output>;
const MIN_LENGTH: usize = Fut::Output::MIN_LENGTH;
fn to_html_with_buf(self, _buf: &mut String, _position: &mut Position) {
todo!()
}
fn to_html_async_with_buf<const OUT_OF_ORDER: bool>(
self,
_buf: &mut StreamBuilder,
_position: &mut Position,
) where
Self: Sized,
{
todo!();
}
// TODO cancellation
fn hydrate<const FROM_SERVER: bool>(
self,
cursor: &Cursor<Rndr>,
position: &PositionState,
) -> Self::State {
// poll the future once immediately
// if it's already available, start in the ready state
// otherwise, start with the fallback
let mut fut = Box::pin(ScopedFuture::new(self.0));
let initial = fut.as_mut().now_or_never();
let initially_pending = initial.is_none();
let inner = Rc::new(RefCell::new(
initial.hydrate::<FROM_SERVER>(cursor, position),
));
// get a unique ID if there's a SuspenseContext
let id = use_context::<SuspenseContext>().map(|sc| sc.task_id());
// if the initial state was pending, spawn a future to wait for it
// spawning immediately means that our now_or_never poll result isn't lost
// if it wasn't pending at first, we don't need to poll the Future again
if initially_pending {
Executor::spawn_local({
let state = Rc::clone(&inner);
async move {
let value = fut.as_mut().await;
drop(id);
Some(value).rebuild(&mut *state.borrow_mut());
}
});
}
SuspendState { inner }
}
async fn resolve(self) -> Self::AsyncOutput {
Some(self.0.await)
}
fn dry_resolve(&mut self) {}
}

1
tachys/src/view/primitives.rs
View file

@ -105,6 +105,7 @@ macro_rules! render_primitive {
}
let node = cursor.current();
R::log_node(&node);
let node = R::Text::cast_from(node)
.expect("couldn't cast text node from node");