⚡ Bolt: Offload blocking I/O in dashboard handler#216
⚡ Bolt: Offload blocking I/O in dashboard handler#216EffortlessSteven wants to merge 2 commits intomainfrom
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This change optimizes the dashboard handler by wrapping synchronous file I/O and spec loading operations in `tokio::task::spawn_blocking`. This prevents blocking the async runtime and improves responsiveness under load. - Adds `tokio` dependency to `crates/http-platform` - Wraps `load_all_specs`, `load_tasks`, `load_service_metadata`, and file reads in `spawn_blocking` - Handles `JoinError` gracefully by returning internal server errors
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Pull request overview
This PR improves the http-platform UI dashboard handler by moving synchronous filesystem reads and spec parsing out of the async request context and onto Tokio’s blocking thread pool, reducing the risk of starving async workers under concurrent load.
Changes:
- Wrap spec/task loading and status file reads in
tokio::task::spawn_blockingwithin the dashboard handler. - Add
tokioas a direct dependency ofhttp-platform(now used in non-test code). - Add a Jules “bolt” note documenting the learned pattern for future work.
Reviewed changes
Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.
| File | Description |
|---|---|
| crates/http-platform/src/ui.rs | Offloads blocking I/O + parsing in dashboard via spawn_blocking, threading through policy + feature status data. |
| crates/http-platform/Cargo.toml | Adds tokio to [dependencies] to support the new runtime usage. |
| .Jules/bolt.md | Records the pattern/learning to prevent reintroducing blocking I/O in async handlers. |
Comments suppressed due to low confidence (1)
crates/http-platform/Cargo.toml:30
tokiois now listed in both[dependencies]and[dev-dependencies]. Since the crate usestokio::task::spawn_blockingin non-test code, it should live in[dependencies]only; consider removing the redundantdev-dependenciesentry to avoid duplication/confusion.
tracing.workspace = true
tokio.workspace = true
[dev-dependencies]
testing.workspace = true
tokio.workspace = true
tower.workspace = true
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| .await | ||
| .unwrap_or_else(|e| { | ||
| ( | ||
| Err(spec_runtime::SpecError::Internal(format!("Task failed: {}", e))), | ||
| Err(spec_runtime::SpecError::Internal("Task failed".into())), | ||
| None, | ||
| "unknown".to_string(), | ||
| None, | ||
| ) | ||
| }); |
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The spawn_blocking join-error path drops useful context and doesn’t log the JoinError. Consider logging the join failure (it usually means panic/cancel) and include the same join error context in both status_result and tasks_result so debugging isn’t blind.
This change optimizes the dashboard handler by wrapping synchronous file I/O and spec loading operations in `tokio::task::spawn_blocking`. This prevents blocking the async runtime and improves responsiveness under load. - Adds `tokio` dependency to `crates/http-platform` - Wraps `load_all_specs`, `load_tasks`, `load_service_metadata`, and file reads in `spawn_blocking` - Handles `JoinError` gracefully by returning internal server errors - Fixes `cargo fmt` violations by inlining tuple return
Test Results283 tests 245 ✅ 11m 22s ⏱️ Results for commit 3efb1e1. |
⚡ Bolt: Offload blocking I/O in dashboard handler
💡 What:
Wrapped synchronous file I/O and parsing operations in the
dashboardhandler withintokio::task::spawn_blocking.🎯 Why:
The
dashboardhandler was performing blocking operations (loading specs, tasks, reading status files) directly in the async context, which can stall thetokioreactor and degrade performance for concurrent requests.📊 Impact:
Should improve responsiveness and throughput under load by freeing up the async worker threads.
🔬 Measurement:
Verified by running
cargo test -p app-http --test ui_contract_domto ensure no regression in UI functionality.PR created automatically by Jules for task 2420688498748597201 started by @EffortlessSteven