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Graph/asyncio

Package

asyncio

asyncio

asyncio

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Updated4/30/2026

PageRank0.0002

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20 linked nodes

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AFFECTSRootCause

Instead of awaiting `consume_messages()`, spawn it via `asyncio.create_task()` — awaiting `consume_messages()`.

AFFECTSRootCause

single worker running async loop. Tension: you block that loop with plain sleep function.

AFFECTSRootCause

the database operations (`db.commit`, `db.flush`) were all synchronous — When a route in FastAPI is listed as asynchronous (`async def`). Outcome: meaning the event loop is blocked until they are completed.

AFFECTSRootCause

the two test frameworks maintain the event loops differently — having a mix of `unittest` and `pytest`. Tension: the intention is that `event_loop` fixture controls the loop and policy.

AFFECTSRootCause

`time.sleep()` does block the thread, but it contains a `C` macro that periodically releases its lock on the global interpreter. — Concurrency in Python (with GIL). Tension: how is the event loop still able to execute other tasks concurrently? Outcome: `time.sleep()` voluntarily releases the lock on the global interpreter with the macro mentioned above.

AFFECTSRootCause

Contextvars where added to the language so that concurrent Async tasks can "see" independent context information — The act of creating a concurrent task in asyncio, which FastAPI does for your before calling `main`. Tension: even if the tasks run the same functions.

AFFECTSRootCause

it doesn't handle the asynchronous nature of the FastAPI app's lifespan context properly — The main reason that the written test fails. Tension: `global_rw` is not set due to improper initialization. Outcome: the FastAPI app's lifespan context correctly works and `global_rw` is initialized properly.

AFFECTSRootCause

The WebSocket server sends/flushes progress updates in a way that buffers or delays delivery to the client during long-running processing, likely due to the event loop being blocked (or not yielding) while handling uploads and processing.

AFFECTSRootCause

you probably will need to use and async client with the asyncio pytest plugins — Since you're writing an async lifespan. Tension: sync/async issue.

AFFECTSRootCause

looked around and seen discussion about turning off response buffering — when we push it to our Azure Web App. Outcome: Make sure App service computation is not reaching threshold.

REQUIRESRootCause

Instead of awaiting `consume_messages()`, spawn it via `asyncio.create_task()` — awaiting `consume_messages()`.

REQUIRESSolution

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

REQUIRESSolution

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:.

REQUIRESSolution

Using a `session-scoped` pytest fixture, for managing the event loop — which ensures the same event loop will be used. Outcome: loop.close().

REQUIRESSolution

python interpreter just pauses one task and looks at other — In your scenerio where you use asynchronous. Tension: it is not completly usesless. Outcome: Think it like a round-robin.

REQUIRESSolution

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.

REQUIRESSolution

I have enabled CORS. — deployed to Azure web app. Tension: we can't see it being recieved on the frontend. Outcome: Upgrade your app service plan which can handle computation.

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