feat: implement live run synchronization and event handling#18
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cambriayang
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Jun 2, 2026
cambriayang
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- Introduced live synchronization for runs using SSE, allowing real-time updates in the runs list and detail pages.
- Enhanced the RunsPage component to display live run status and update frequency.
- Updated RunDetailPage to utilize live updates for run events, improving user experience during run execution.
- Created utility functions for managing run events and live synchronization logic in the new useRunLiveSync and useRunEventSource hooks.
- Refactored EventStream component to handle event streaming more efficiently and display connection status.
- Introduced live synchronization for runs using SSE, allowing real-time updates in the runs list and detail pages. - Enhanced the RunsPage component to display live run status and update frequency. - Updated RunDetailPage to utilize live updates for run events, improving user experience during run execution. - Created utility functions for managing run events and live synchronization logic in the new useRunLiveSync and useRunEventSource hooks. - Refactored EventStream component to handle event streaming more efficiently and display connection status.
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Pull request overview
Replaces the polling-based run list/detail refresh with a live SSE-backed synchronization layer. A reusable run-event connection helper is extracted from EventStream, and new hooks merge SSE events into the React Query cache for both the runs list and the run detail page.
Changes:
- New
run-event-connection.ts(SSE connection with reconnect/backoff and status reporting) andrun-events.ts(event reducers:applyRunEvent,patchRunInList, terminal/live helpers). - New
useRunEventSource/useMultiRunEventSource/useRunWithLiveUpdates/useRunsListLiveSynchooks plus auseDebouncedCallbackutility. RunsPageandRunDetailPageswitch fromrefetchIntervalpolling to live SSE updates;EventStreambecomes a presentational component receiving events and status as props.
Reviewed changes
Copilot reviewed 8 out of 8 changed files in this pull request and generated 3 comments.
Show a summary per file
| File | Description |
|---|---|
| frontend/lib/run-event-connection.ts | New EventSource wrapper with status callbacks, manual reconnect/backoff, and terminal handling. |
| frontend/lib/run-events.ts | Event constants and pure reducers that fold SSE events into Run snapshots and list rows. |
| frontend/lib/useRunEventSource.ts | Hooks wrapping the connection helper for single-run and multi-run subscriptions. |
| frontend/lib/useRunLiveSync.ts | Higher-level hooks integrating SSE events with React Query caches plus a debounced reconcile. |
| frontend/lib/useDebouncedCallback.ts | Generic debounce hook with a cancel method, used to coalesce reconciles. |
| frontend/components/EventStream.tsx | Refactored to a stateless presentational component driven by events/status props. |
| frontend/app/runs/page.tsx | Drops 3s polling, derives live run IDs, subscribes via useRunsListLiveSync, updates header label. |
| frontend/app/runs/[id]/page.tsx | Replaces polling useQuery with useRunWithLiveUpdates; removes terminal-invalidation prop on EventStream. |
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| const runKey = runIds.slice().sort().join(","); | ||
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| useEffect(() => { | ||
| if (!runKey) return; | ||
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| const ids = runKey.split(","); | ||
| const connections = ids.map((runId) => | ||
| createRunEventConnection(runId, { | ||
| onEvent: (event) => { | ||
| onEventRef.current?.(event); | ||
| }, | ||
| onTerminal: (event) => { | ||
| onTerminalRef.current?.(event); | ||
| }, | ||
| }), | ||
| ); | ||
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| return () => { | ||
| connections.forEach((connection) => connection.close()); | ||
| }; | ||
| }, [runKey]); |
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| function patchToolCall( | ||
| step: Step, | ||
| data: Record<string, unknown>, | ||
| at: string, | ||
| ): Step { | ||
| const name = typeof data.name === "string" ? data.name : ""; | ||
| const toolCalls = [...step.tool_calls]; | ||
| let index = toolCalls.findIndex((call) => call.name === name); | ||
| if (index === -1) { | ||
| toolCalls.push(appendToolCall(step, data)); | ||
| index = toolCalls.length - 1; | ||
| } | ||
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| toolCalls[index] = { | ||
| ...toolCalls[index], | ||
| result: | ||
| "result" in data | ||
| ? (data.result as Record<string, unknown> | null) | ||
| : toolCalls[index].result, | ||
| error: | ||
| typeof data.error === "string" ? data.error : toolCalls[index].error, | ||
| latency_ms: | ||
| typeof data.latency_ms === "number" | ||
| ? data.latency_ms | ||
| : toolCalls[index].latency_ms, | ||
| }; | ||
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| return { ...step, tool_calls: toolCalls, updated_at: at }; | ||
| } |
Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
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