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https://github.com/hanzoai/next.js.git
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5d0dab5fc6
### What? Replaces the silent "make root node" promotion in the turbo-tasks backend with a panic that enforces tasks to already have the `root` attribute before performing strongly consistent reads, reading task collectibles, or removing collectibles. ### Why? Previously, the backend would silently promote any non-root task to a root node (aggregation number `u32::MAX`) when these operations were requested. This masked incorrect task configuration — tasks that needed root-level aggregation weren't explicitly declared as such, making it harder to reason about the aggregation graph and hiding potential performance issues from implicit promotions. ### How? **Backend enforcement (3 locations):** - **Strongly consistent read** (`backend/mod.rs`): Checks `NativeFunction.is_root` on the target task. If it's a persistent task without `root`, panics with both the target and reader task descriptions. - **Read task collectibles** (`backend/mod.rs`): Same check when reading collectibles from a task. - **Remove collectibles** (`operation/update_collectible.rs`): Same check when removing collectibles (count < 0). All three locations drop the task guard before panicking to avoid deadlocking with `debug_get_task_description`. **Macro support for `root` on methods:** - `value_impl_macro.rs`: Now reads the `root` attribute from `#[turbo_tasks::function(root)]` on inherent impl and trait impl methods (previously hardcoded to `false`). - `value_trait_macro.rs`: Same for trait default methods. **`root` attribute additions:** - All `#[turbo_tasks::function(operation)]` in test files, benchmarks, and fuzz code - Production operations in `crates/next-api/` that are read with strong consistency - Regular functions and methods in tests that use `.strongly_consistent()` - Trait methods in `value_impl` and `value_trait` blocks used with strong consistency **New test:** - `non_root_task_panic.rs`: Verifies the panic fires when attempting a strongly consistent read on a non-root operation task. Captures the panic from the worker thread via a panic hook since the panic propagates as a channel error to the test thread. <!-- NEXT_JS_LLM_PR --> --------- Co-authored-by: Claude Opus 4.7 (1M context) <[email protected]>
85 lines
2.4 KiB
Rust
85 lines
2.4 KiB
Rust
#![feature(arbitrary_self_types)]
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#![feature(arbitrary_self_types_pointers)]
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#![allow(clippy::needless_return)] // tokio macro-generated code doesn't respect this
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use anyhow::Result;
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use turbo_tasks::{ResolvedVc, State, Vc};
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use turbo_tasks_testing::{Registration, register, run};
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static REGISTRATION: Registration = register!();
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#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
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async fn test_emptied_cells() {
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run(®ISTRATION, || async {
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let input_op = get_state_operation();
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let input_vc = input_op.resolve().strongly_consistent().await?;
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let input = input_op.read_strongly_consistent().await?;
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input.state.set(0);
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let output = compute_operation(input_vc);
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assert_eq!(*output.read_strongly_consistent().await?, 0);
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println!("changing input");
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input.state.set(10);
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assert_eq!(*output.read_strongly_consistent().await?, 10);
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println!("changing input");
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input.state.set(5);
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assert_eq!(*output.read_strongly_consistent().await?, 5);
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println!("changing input");
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input.state.set(20);
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assert_eq!(*output.read_strongly_consistent().await?, 20);
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println!("changing input");
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input.state.set(15);
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assert_eq!(*output.read_strongly_consistent().await?, 15);
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println!("changing input");
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input.state.set(1);
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assert_eq!(*output.read_strongly_consistent().await?, 1);
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anyhow::Ok(())
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})
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.await
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.unwrap();
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}
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#[turbo_tasks::function(operation, root)]
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fn get_state_operation() -> Vc<ChangingInput> {
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ChangingInput {
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state: State::new(0),
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}
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.cell()
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}
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#[turbo_tasks::value]
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struct ChangingInput {
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state: State<u32>,
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}
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#[turbo_tasks::function(operation, root)]
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async fn compute_operation(input: ResolvedVc<ChangingInput>) -> Result<Vc<u32>> {
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println!("compute_operation()");
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let value = *inner_compute(*input).await?;
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Ok(Vc::cell(value))
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}
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#[turbo_tasks::function]
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async fn inner_compute(input: Vc<ChangingInput>) -> Result<Vc<u32>> {
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println!("inner_compute()");
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let state_value = *input.await?.state.get();
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let mut last = None;
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for i in 0..=state_value {
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last = Some(compute2(Vc::cell(i)));
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}
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Ok(last.unwrap())
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}
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#[turbo_tasks::function]
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async fn compute2(input: Vc<u32>) -> Result<Vc<u32>> {
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println!("compute2()");
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let value = *input.await?;
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Ok(Vc::cell(value))
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}
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