Phoebe Goldman 8c5f40db8d Add the snapshot crate, which implements snapshotting at a low level (#1340) ...

* Add the `snapshot` crate, which implements snapshotting at a low level

- Requires making `BlobHash` be `Serialize` and `Deserialize`.
  For arcane macro-ology reasons, this requires writing `BlobHash::SIZE`
  instead of `Self::SIZE` (it gets embedded in a visitor struct or something).
- Requires adding two new operators to `BlobStore`.
- Adds a return value to `Page::save_content_hash`, for convenience.
- Impls `DerefMut` for `Pages`.
- **Scary change:** adds `Table::pages_mut`.
  I think possibly this operator should be `unsafe`,
  since write access to the `Pages` allows an undisciplined caller
  to violate the `Table`'s assumptions by corrupting a `Page`.
  It seems like an anti-pattern to mark a method `unsafe` on the grounds that
  misusing its return value can cause UB,
  but I don't see a plausible alternative
  without making most methods on `Page` unsafe.
  Open to feedback on this one!

* Nix `Table::pages_mut`

* Address Mazdak's feedback

* Use `thiserror` rather than `anyhow` for better error hygiene

2024-06-05 21:58:12 +00:00

..

src

Add the snapshot crate, which implements snapshotting at a low level (#1340)

2024-06-05 21:58:12 +00:00

Cargo.toml

Add the snapshot crate, which implements snapshotting at a low level (#1340)

2024-06-05 21:58:12 +00:00

LICENSE

Add the snapshot crate, which implements snapshotting at a low level (#1340)

2024-06-05 21:58:12 +00:00