[Fix] CRUD upload retries #205
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Overview
A bug was recently discovered where CRUD uploads would not retry (for a long time) after failing when using the WebSocket connection method.
This was due to a failed upload updating the connection status to
connected: false. Following CRUD loop iterations would check the connection status and exit if not connected.The connection status is usually updated to
truewhenever a sync event is received from the PowerSync backend server. For the HTTP method keep-alive events are sent at regular intervals which will update the status back toconnected: true. This is not the case for WebSockets as that method handles keep-alive events internally.This PR aligns the CRUD upload connection status logic with the Dart SDK. The connection status is not set to
falseif an upload fails. It is only set tofalseif the connection to the backend server is closed. Reference here: https://github.com/powersync-ja/powersync.dart/blob/d812f78a5ae830e4ccdf29e1cb0a76aa27b01042/packages/powersync/lib/src/streaming_sync.dart#L102Testing
Unit tests have been added to ensure CRUD uploads are correctly triggered and retried.