What are some effective troubleshooting methods for resolving issues with chrome.storage.sync?

My Chrome extension is a simple tool that utilizes the chrome.storage API to keep track of tasks in a organized list. Whenever there is an update to the task list, the array is saved to chrome.storage.sync.

I have both of my laptops configured with the Chrome extension and I am signed into the same Google account on both devices.

There are times when updating the task list on one laptop results in immediate reflection of the changes on the other laptop. However, there are also instances where the updates take a long time to sync between the two devices. The inconsistency is puzzling - sometimes restarting Chrome on the second laptop will display the updated list.

No console errors are showing up on either laptop, and the tasks are being saved correctly on the first laptop, they just aren't transferring over to the second one.

The chrome.storage.sync API has certain limitations which make me consider if I may be exceeding them. A likely limitation is the following:

10 MAX_SUSTAINED_WRITE_OPERATIONS_PER_MINUTE

"This refers to the maximum number of set, remove, or clear operations allowed per minute, sustained over 10 minutes. Any updates surpassing this limit will fail immediately and trigger runtime.lastError."

From what I understand, as long as there are not more than 10 operations within a minute for 10 consecutive minutes (100 total), the limit should not be exceeded. If I was breaching this limit, I would expect to see a console error or encounter issues saving the tasks locally.

Overall, is there a way to troubleshoot problems with Chrome sync? Is some level of flakiness to be anticipated?

Answer №1

It is worth noting that there are issues associated with relying on chrome.storage.sync.

  1. If you reach the quota limit, your extension may be blacklisted in memory until Chrome is restarted.

    While theoretically possible to catch a quota error using the chrome.storage.set callback and handle it by implementing backoff or buffering mechanisms,

    In practice, there have been reports (see: anecdotal evidence) of Chrome itself (not Google backend) blacklisting extensions that exceed limits, and this blacklist persists even after the Chrome session should refresh the quota. This issue was previously reported (see: here) as of 2014-10-16. It has since been reportedly fixed.

  2. No method currently exists to wait for or request synchronous syncing.

    Regrettably, the current version of chrome.storage.sync does not include an event to signal when remote synchronization is complete or if an error has occurred when there is no change to local state. As a result, waiting reliably for such data retrieval is impossible. According to Chrome developers, this functionality is unlikely to change.

  3. No information about the sync state is accessible.

    Forget about events; the API does not even disclose whether Chrome Sync is activated. This lack of transparency could be addressed if the API exposed the last known sync timestamp. However, this capability is currently unavailable; a feature request has been filed.

Despite these challenges, chrome.storage.sync remains a valuable tool. Users should proceed with caution, recognizing its unreliability and considering implementing their rate-limiting measures.

To directly address your query

To troubleshoot chrome.storage.sync, users can explore its operations through the chrome://sync-internals page.

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