Details
Critical Description
This issue is found during the todo test fest between CBL iOS 3.0.1 and SG 3.0 EE with delta sync enabled (setting "delta_sync":
{ "enabled": true}in SG config for the database).
How to reproduce :
1. Start todo app and login with a user.
2. Create a task list.
3. Create a task.
4. Update a task twice (check and uncheck) to generate a couple of revisions.
5. Add an image to the test.
6. Update an image to the test.
In the Step 5, CBL sent the rev message as follows:
{"type":"task","complete":false,"task":"Task1","taskList":{"owner":"user1","id":"user1.C2A33691-EE4D-497D-B6E4-DAB5424998BE"},"createdAt":"2022-03-03T19:08:25.651Z", |
"image":{"length":2051240,"digest":"sha1-yNrLH9jxGSDhenJZvYSOUXWgnhQ=","content_type":"image/jpeg","@type":"blob"}," |
_attachments":{"blob_/image":{"length":2051240,"digest":"sha1-yNrLH9jxGSDhenJZvYSOUXWgnhQ=","content_type":"image/jpeg","stub":true,"revpos":4}}} |
In the Step 6, CBL sent the rev message including only the attachment due to delta sync enabled.
{"_attachments":{"blob_/image":{"content_type":"image/jpg","digest":"sha1-UzFeXdWAt/GoJ4y0ak0IH82sJg0=","length":500554}}, |
"image":{"content_type":"image/jpg","digest":"sha1-UzFeXdWAt/GoJ4y0ak0IH82sJg0=","length":500554}} |
The attachment info above doesn't include the revpos=5.
With that above, when using SG 3.0, the end result will cause the mismatch sha-1 digests stored in the SG as below:
{"_attachments":{"blob_/image":{"content_type":"image/jpeg","digest":"sha1-yNrLH9jxGSDhenJZvYSOUXWgnhQ=","length":2051240,"revpos":4,"stub":true}},"_id":"-oyDVcP3l1qOsuZixcXap9W","_rev":"5-450d033bdaca325ce8edd0e974b9d8426f3630a4","complete":false,"createdAt":"2022-03-03T19:08:25.651Z","image":{"@type":"blob","content_type":"image/jpg","digest":"sha1-UzFeXdWAt/GoJ4y0ak0IH82sJg0=","length":500554},"task":"Task1","taskList":{"id":"user1.C2A33691-EE4D-497D-B6E4-DAB5424998BE","owner":"user1"},"type":"task"} |
