A fully compatible implementation of LevelDB in Rust. (any incompatibility is a bug!)
The implementation is very close to the original; often, you can see the same algorithm translated 1:1, and class (struct) and method names are similar or the same.
NOTE: I do not endorse using this library for any data that you care about. I do care, however, about bug reports.
- User-facing methods exist: Read/Write/Delete; snapshots; iteration
- Compaction is supported, including manual ones.
- Fully synchronous: Efficiency gains by using non-atomic types, but writes may occasionally block during a compaction. In --release mode, an average compaction takes 0.2-0.5 seconds.
- Compatibility with the original: Compression is not implemented so far; this works as long as compression is disabled in the original.
- Performance is decent; while usually not par with the original, due to multi-threading in the original and language-inherent overhead (we are doing things the right way), it will be enough for most use cases.
- Safe: While using many shared pointers, the implementation is generally safe. Many places use asserts though, so you may see a crash -- in which case you should file a bug.
Some of the goals of this implementation are
- As few copies of data as possible; most of the time, slices of bytes (
&[u8]) are used. Owned memory is represented as
Vec<u8>(and then possibly borrowed as slice).
- Correctness -- self-checking implementation, good test coverage, etc. Just like the original implementation.
- Clarity; commented code, clear structure (hopefully doing a better job than the original implementation).
- Coming close-ish to the original implementation; clarifying the translation of typical C++ constructs to Rust.