⚡ Bolt: Offload dashboard I/O to blocking thread#200
⚡ Bolt: Offload dashboard I/O to blocking thread#200EffortlessSteven wants to merge 1 commit intomainfrom
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Summary by CodeRabbit
WalkthroughTokio workspace dependency added to Cargo.toml. UI dashboard handler refactored to offload blocking file I/O operations (reading specs, tasks, metadata, policy and feature status) from the main async thread to Tokio blocking thread pool, with updated error handling for task spawning failures. Changes
Estimated code review effort🎯 3 (Moderate) | ⏱️ ~25 minutes Poem
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Summary of ChangesHello @EffortlessSteven, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed! This pull request refactors the dashboard's data loading mechanism to improve application performance and responsiveness. By offloading potentially blocking file system operations to a separate thread, the main asynchronous event loop remains unblocked, ensuring smoother handling of concurrent requests and a more stable user interface. Highlights
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Code Review
This pull request correctly offloads blocking I/O operations in the dashboard handler to a separate thread using tokio::task::spawn_blocking. This is an important performance improvement that prevents the async runtime from being stalled. The implementation is solid. I have a couple of suggestions to further improve the code by simplifying some logic and adding logging for better observability.
| let feature_status_content = if feature_status_path.exists() { | ||
| std::fs::read_to_string(feature_status_path).ok() | ||
| } else { | ||
| None | ||
| }; |
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The check for feature_status_path.exists() is redundant. std::fs::read_to_string will return an Err if the file does not exist, which is then converted to None by .ok(). You can simplify this logic to a single line.
let feature_status_content = std::fs::read_to_string(feature_status_path).ok();| }) | ||
| .await | ||
| .unwrap_or_else(|e| { | ||
| // If spawn_blocking fails (e.g. panic), return errors that will trigger the error UI |
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It's good practice to log when a task panics. This can help with debugging issues in production. Consider adding a tracing::error! call here to log the JoinError.
tracing::error!("Blocking task for dashboard panicked: {}", e);
// If spawn_blocking fails (e.g. panic), return errors that will trigger the error UIThere was a problem hiding this comment.
Pull request overview
This PR updates the http-platform dashboard handler to avoid blocking the async runtime by moving synchronous spec/file reads into tokio::task::spawn_blocking, improving request concurrency for the UI endpoints.
Changes:
- Offloads dashboard spec loading and file reads (policy status + feature status) onto a blocking thread via
spawn_blocking. - Passes pre-read
policy_statusandfeature_status_contentback into the async context for rendering. - Adds
tokioas a direct dependency ofhttp-platform.
Reviewed changes
Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.
| File | Description |
|---|---|
| crates/http-platform/src/ui.rs | Wraps blocking spec/file I/O for the dashboard route in tokio::task::spawn_blocking. |
| crates/http-platform/Cargo.toml | Adds tokio to dependencies to support spawn_blocking usage. |
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| .await | ||
| .unwrap_or_else(|e| { | ||
| // If spawn_blocking fails (e.g. panic), return errors that will trigger the error UI | ||
| ( | ||
| Err(spec_runtime::SpecError::Internal(e.to_string())), | ||
| Err(spec_runtime::SpecError::Internal(e.to_string())), | ||
| None, | ||
| "unknown".to_string(), | ||
| None, | ||
| ) | ||
| }); |
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The spawn_blocking(...).await.unwrap_or_else(...) branch swallows the JoinError without logging it, which can make panics/cancellations in the blocking task very hard to diagnose in production. Consider logging the join error (e.g., tracing::error!(...)) before mapping it to SpecError::Internal, similar to crates/app-http/src/platform/ui.rs where join errors are logged.
💡 What: Wrapped synchronous I/O operations (loading specs, reading status files) in the dashboard handler with
tokio::task::spawn_blocking.🎯 Why: These operations were blocking the async runtime's worker thread, potentially stalling other concurrent requests and reducing throughput.
📊 Impact: prevents the event loop from being blocked by file system operations, improving concurrency handling.
🔬 Measurement: Verified by
cargo test -p http-platformand code review confirming the removal of blocking calls from the async context.PR created automatically by Jules for task 11891131250052697173 started by @EffortlessSteven