workinf_Blender_Wasm/docs/status/W-042.md

W-042 Status

status: done task: 保存 .blend 原子事务

StorageWorker saveProject accepts a transferable ArrayBuffer, creates the OPFS project layout, writes and SHA-256-verifies scene.blend.<uuid>.stage, records a recovery journal, and uses same-directory move (or a complete-copy fallback) before re-verifying scene.blend. Only then does it write the manifest, clear the journal and update the IndexedDB project record with revision, byte count, digest, backend and timestamp. The React Save command now submits this transaction before downloading the .blend Blob, and keeps the StorageClient alive for the project session. When OPFS is unavailable, the record stores the buffer in IndexedDB instead. Playwright injects failures after staging and after scene commit, restarts the Worker, and verifies exact bytes/revision/digest through readProject. Concurrent same-project saves are serialized and the last submitted revision wins without journal races.