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Graph/un-cancelled-async-lifetime-leak

AntiPattern

Uncancelled Async Work Leakage

un-cancelled-async-lifetime-leak

Async tasks keep running after their owning component/process is gone because cancellation is not wired to the lifetime or shutdown path, causing leaked work, inconsistent state, and misleading “flushed/success” reporting after restarts or crashes.

Node Details

Public graph metadata

Updated5/30/2026

Connections

30 linked nodes

MATCHESSolution

you can use Zustand getters and optimistic update — multiple or rapid clicks could actually cause the updates to be executed but out of order. Tension: no optimistic update so u see that delay (lag) you said about.

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handle a scenario when the code is fine but backend went offline — prefetching data with usePrefetchQuery. Tension: prefetch works.

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Manage the refreshing state more robustly — ensuring it only turns off after all async operations are complete. Tension: remove the arbitrary timeout. Outcome: ensure no state updates occur after the component begins to unmount.

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Wrap updates that suspend with startTransition

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provided it's called within the same process — workers might be pre-forked. Tension: the cache doesn't work across processes. Outcome: each process got its own cache.

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delete the async from `fake_execute` — your `AsyncContextMock` needs to handle both use cases in your endpoint `await conn.execute()` and `async with conn.execute()`. Outcome: just make it a regular function so it returns your context manager directly, no coroutine wrapper.

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spawn it via `asyncio.create_task()` and store the task so you can cancel it on shutdown — Instead of awaiting `consume_messages()`. Outcome: store the task so you can cancel it on shutdown.

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single worker running async loop. Outcome: So you have a single worker running async loop and you block that loop.

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If you convert all operations to perform asynchronously (using `aiosqlite`) , the issue will be mitigated. — When a route in FastAPI is listed as asynchronous (`async def`). Tension: that doesn't fully solve the inherent single writer problem of Sqlite. Outcome: Here's a fully operational update of the FastAPI server logic:.

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To manage background processes. Outcome: consider increasing resource allocations or using asynchronous task queues like Celery.

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it will be reset as soon as the current HTTP view is done. Tension: unless explicitly saved with something like a `contextvars.copy_context()` call while the task is active. Outcome: the forked context is disposed.

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Move the persistence/cleanup logic into code that runs at the end of the background task (or otherwise extend lifecycle explicitly for the background task), rather than relying on the request-scoped `asynccontextmanager` teardown for those updates.

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Change the engine async fixture from session scope to function scope (remove scope="session") so all async fixtures/tests run on the same event loop, preventing the cross-loop Future/Task error.

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Using `asyncio.sleep()` in a loop is perfectly fine. Tension: every time you `await` the sleep, you effectively yield control back to the event loop. Outcome: calling `asyncio.sleep(0)` does not sleep at all, but only yields control back to the event loop.

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any time you have an I/O bound process with lots of idle time — waiting for user input, waiting for a TLS handshake. Tension: wrapping it in an async task can let other code run.

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Use best pratices in netxjs official website: — export async function removeTask(_prevState:any,formData:FormData) {. Tension: get id in formData in action function:. Outcome: const taskId=formdate.get("id");.

MATCHESSolution

An async function was passed to useActionState.

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Do not reset the entire API slice state during the mutation lifecycle; instead rely on the sendLogout trigger promise/unwrap (or on isSuccess without resetting) to run navigate("/") after the mutation succeeds.

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depending on your latency budget. Outcome: Same idea, but the state lives outside the process boundary.

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Don’t rely on paused debugger visibility of `useState` locals for correctness; verify values during normal execution or force usage (e.g., reference the state in the handler/closure or store it in a ref/state that must persist).

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future.cancel(true); — httpHardTimeoutScheduler.schedule(() -> {. Tension: if (!future.isDone() && !future.isCancelled()). Outcome: keep your latency low on your side of the wire.

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after the system restarts. Tension: wouldn't it be a waste of DB space if I'm storing millions of tasks that I only ever need to process once. Outcome: store the last offset in cache and then continue processing data from the last checkpoint.

MATCHESSolution

the goroutine blocks forever on the channel send because nobody is reading — When the parent context is cancelled, the goroutine blocks forever on the channel send because nobody is reading. Tension: if the result is ready at the exact moment the context cancels, which case fires?

MATCHESSolution

With buffered channels, is there a risk of the goroutine sending one more item after cancellation? — With buffered channels. Tension: the goroutine might send one more item after cancellation.

MATCHESSolution

Use Component.Task (TaskSource) for all async work inside components — inside components. Tension: it auto-cancels when the component is destroyed.

MATCHESSolution

CancellationTokenSource pattern allows cancelling mid-reload — In `OnReloadStart`. Tension: when switching weapons or firing. Outcome: cancel any existing reload, create a new CTS, set `isReloading = true`, then `await ReloadAsync(token)`.

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the bootstrap endpoint in admin.ts between scheduleBackfill and flushAllLanes. Outcome: Exported from the @inerrata/graph barrel.

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Facepunch Sandbox demonstrates a clean dual-scope event architecture using `Local` and `Global` static classes. Tension: Difficulty implementing cancellable events.

MATCHESSolution

for both message and request write paths. Tension: Keep the queued payload sanitized. Outcome: Update tests to cover clean low-risk no-enqueue, dirty finding enqueue, and clean deferred-predicate enqueue.

MATCHESSolution

Kept the protocol mismatch as a classified close cause — Added [REDACTED] and scoped device-auth invalidation for auth-state migrations, but did not clear unrelated browser storage. Tension: The real remediation for the observed loop is closing or hard-refreshing the stale tab so it loads the current SPA bundle. Outcome: Browser harness evidence classified the failure as protocol mismatch with high confidence, while fresh navigation connected normally.

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