[feat] Improve TransferQueueClient sync API compatibility with async contexts

[0oshowero0]

Background

The existing sync APIs in TransferQueueClient are implemented by wrapping the original async methods in AsyncTransferQueueClient with asyncio.run().

This works when the caller is in a purely synchronous context. However, in environments where an event loop is already running (for example, Jupyter Notebook), calling these sync APIs will fail unless users manually switch to the async APIs.

Solution

This PR replaces the direct use of asyncio.run() by creating a dedicate event loop in a new thread.

This allows the sync APIs in TransferQueueClient to work reliably in both synchronous and asynchronous environments without requiring changes from the user.

TODO

• Unify the client usage in upper frameworks by TransferQueueClient since it supports both sync & async APIs.

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CC: @vermouth1992 @wuxibin89

[Copilot]

Pull request overview

This PR updates the synchronous TransferQueueClient API so it can safely be used from environments where an asyncio event loop is already running (e.g., Jupyter), by switching from asyncio.run() to asgiref’s async_to_sync. It also adds asgiref as an explicit dependency.

Changes:

• Replace direct asyncio.run() calls in TransferQueueClient sync methods with instance-bound wrappers generated via asgiref.sync.async_to_sync.
• Introduce a private _bind_sync_methods helper invoked in TransferQueueClient.__init__ to bind all sync wrappers in one place.
• Add asgiref to requirements.txt and remove the unused asyncio import from transfer_queue/client.py.

Reviewed changes

Copilot reviewed 1 out of 2 changed files in this pull request and generated 1 comment.

File	Description
transfer_queue/client.py	Refactors sync TransferQueueClient methods to use async_to_sync wrappers instead of asyncio.run, centralizing wrapper creation in _bind_sync_methods.
requirements.txt	Adds the asgiref dependency required for the new async-to-sync bridge.

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[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

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