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use anyhow::Result;
use turbo_rcstr::{RcStr, rcstr};
use turbo_tasks::{ResolvedVc, Vc};
use turbopack_core::introspect::{Introspectable, IntrospectableChildren};
use super::{ContentSource, route_tree::RouteTree};
/// A functor to get a [ContentSource]. Will be invoked when needed when using
/// [LazyInstantiatedContentSource].
#[turbo_tasks::value_trait]
pub trait GetContentSource {
/// Returns the [ContentSource]
#[turbo_tasks::function]
fn content_source(self: Vc<Self>) -> Vc<Box<dyn ContentSource>>;
}
/// Wraps the [ContentSource] creation in a way that only creates it when
/// actually used.
#[turbo_tasks::value(shared)]
pub struct LazyInstantiatedContentSource {
pub get_source: ResolvedVc<Box<dyn GetContentSource>>,
}
#[turbo_tasks::value_impl]
impl ContentSource for LazyInstantiatedContentSource {
#[turbo_tasks::function]
fn get_routes(&self) -> Vc<RouteTree> {
self.get_source.content_source().get_routes()
}
}
#[turbo_tasks::value_impl]
impl Introspectable for LazyInstantiatedContentSource {
#[turbo_tasks::function]
fn ty(&self) -> Vc<RcStr> {
Vc::cell(rcstr!("lazy instantiated content source"))
}
#[turbo_tasks::function]
async fn children(&self) -> Result<Vc<IntrospectableChildren>> {
Ok(Vc::cell(
[ResolvedVc::try_sidecast::<Box<dyn Introspectable>>(
self.get_source.content_source().to_resolved().await?,
)
.map(|i| (rcstr!("source"), i))]
.into_iter()
.flatten()
.collect(),
))
}
}
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