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use anyhow::Result;
use turbo_rcstr::{RcStr, rcstr};
use turbo_tasks::{Completion, ResolvedVc, State, Vc};
use turbopack_core::introspect::{Introspectable, IntrospectableChildren};
use super::{
ContentSource, ContentSourceData, ContentSourceDataVary, ContentSourceSideEffect,
GetContentSourceContent,
route_tree::{MapGetContentSourceContent, RouteTree, RouteTrees},
};
use crate::source::{ContentSourceContent, ContentSources};
/// Combines two [ContentSource]s like the [CombinedContentSource], but only
/// allows to serve from the second source when the first source has
/// successfully served something once.
///
/// This is a laziness optimization when the content of the second source can
/// only be reached via references from the first source.
///
/// For example, we use that in the content source that handles SSR rendering of
/// pages. Here HTML and "other assets" are in different content sources. So we
/// use this source to only serve (and process) "other assets" when the HTML was
/// served once.
#[turbo_tasks::value(serialization = "none", eq = "manual", cell = "new")]
pub struct ConditionalContentSource {
activator: ResolvedVc<Box<dyn ContentSource>>,
action: ResolvedVc<Box<dyn ContentSource>>,
activated: State<bool>,
}
#[turbo_tasks::value_impl]
impl ConditionalContentSource {
#[turbo_tasks::function]
pub fn new(
activator: ResolvedVc<Box<dyn ContentSource>>,
action: ResolvedVc<Box<dyn ContentSource>>,
) -> Vc<Self> {
ConditionalContentSource {
activator,
action,
activated: State::new(false),
}
.cell()
}
}
#[turbo_tasks::value_impl]
impl ContentSource for ConditionalContentSource {
#[turbo_tasks::function]
async fn get_routes(self: ResolvedVc<Self>) -> Result<Vc<RouteTree>> {
let this = self.await?;
Ok(if !*this.activated.get() {
this.activator.get_routes().map_routes(Vc::upcast(
ConditionalContentSourceMapper { source: self }.cell(),
))
} else {
Vc::<RouteTrees>::cell(vec![
this.activator.get_routes().to_resolved().await?,
this.action.get_routes().to_resolved().await?,
])
.merge()
})
}
#[turbo_tasks::function]
fn get_children(&self) -> Vc<ContentSources> {
Vc::cell(vec![self.activator, self.action])
}
}
#[turbo_tasks::value]
struct ConditionalContentSourceMapper {
source: ResolvedVc<ConditionalContentSource>,
}
#[turbo_tasks::value_impl]
impl MapGetContentSourceContent for ConditionalContentSourceMapper {
#[turbo_tasks::function]
fn map_get_content(
&self,
get_content: ResolvedVc<Box<dyn GetContentSourceContent>>,
) -> Vc<Box<dyn GetContentSourceContent>> {
Vc::upcast(
ActivateOnGetContentSource {
source: self.source,
get_content,
}
.cell(),
)
}
}
#[turbo_tasks::value_impl]
impl Introspectable for ConditionalContentSource {
#[turbo_tasks::function]
fn ty(&self) -> Vc<RcStr> {
Vc::cell(rcstr!("conditional content source"))
}
#[turbo_tasks::function]
fn details(&self) -> Vc<RcStr> {
Vc::cell(if *self.activated.get() {
rcstr!("activated")
} else {
rcstr!("not activated")
})
}
#[turbo_tasks::function]
fn title(&self) -> Result<Vc<RcStr>> {
if let Some(activator) = ResolvedVc::try_sidecast::<Box<dyn Introspectable>>(self.activator)
{
Ok(activator.title())
} else {
Ok(Vc::<RcStr>::default())
}
}
#[turbo_tasks::function]
fn children(&self) -> Result<Vc<IntrospectableChildren>> {
Ok(Vc::cell(
[
ResolvedVc::try_sidecast::<Box<dyn Introspectable>>(self.activator)
.map(|i| (rcstr!("activator"), i)),
ResolvedVc::try_sidecast::<Box<dyn Introspectable>>(self.action)
.map(|i| (rcstr!("action"), i)),
]
.into_iter()
.flatten()
.collect(),
))
}
}
#[turbo_tasks::value(serialization = "none", eq = "manual", cell = "new")]
struct ActivateOnGetContentSource {
source: ResolvedVc<ConditionalContentSource>,
get_content: ResolvedVc<Box<dyn GetContentSourceContent>>,
}
#[turbo_tasks::value_impl]
impl GetContentSourceContent for ActivateOnGetContentSource {
#[turbo_tasks::function]
fn vary(&self) -> Vc<ContentSourceDataVary> {
self.get_content.vary()
}
#[turbo_tasks::function]
async fn get(
self: ResolvedVc<Self>,
path: RcStr,
data: ContentSourceData,
) -> Result<Vc<ContentSourceContent>> {
turbo_tasks::emit(ResolvedVc::upcast::<Box<dyn ContentSourceSideEffect>>(self));
Ok(self.await?.get_content.get(path, data))
}
}
#[turbo_tasks::value_impl]
impl ContentSourceSideEffect for ActivateOnGetContentSource {
#[turbo_tasks::function]
async fn apply(&self) -> Result<Vc<Completion>> {
self.source.await?.activated.set(true);
Ok(Completion::new())
}
}
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