Error `document not attached` occurs when Detach and Sync race

[chacha912]

What happened:

Error document not attached occurs when going backwards in codepair. This error occurs due to a race condition between Detach and Sync requests. Since a sync loop is performed independently of a detach, the client may send a sync request while the document is still considered attached before receiving a response to the detach request. This causes an error on the server because it has already processed the detach request and considers the document detached.

What you expected to happen:

The Detach and Sync requests should not race to avoid the document not attached error.

How to reproduce it (as minimally and precisely as possible):

Anything else we need to know?:

Environment:

• Operating system:
• Browser and version:
• Yorkie version (use yorkie version):
• Yorkie JS SDK version:

[jeonghye-choi]

I'm interested in this issue. Can I give it a shot?

[blurfx]

Sure :)