The [rkv Rust crate](https://crates.io/crates/rkv-crypto) is a simple, humane, typed key-value storage solution. It supports multiple backend engines with varying guarantees, such as [LMDB](http://www.lmdb.tech/doc/) for performance, or "SafeMode" for reliability.
The "SafeMode" backend performs well, with two caveats: the entire database is stored in memory, and write transactions are synchronously written to disk (only on commit).
In the future, it will be advisable to switch to a different backend with better performance guarantees. We're working on either fixing some LMDB crashes, or offering more choices of backend engines (e.g. SQLite).
Comprehensive information about using rkv is available in its [online documentation](https://docs.rs/rkv/), which can also be generated for local consumption:
There are several features that you can opt-in and out of when using rkv:
By default, `db-dup-sort` and `db-int-key` features offer high level database APIs which allow multiple values per key, and optimizations around integer-based keys respectively. Opt out of these default features when specifying the rkv dependency in your Cargo.toml file to disable them; doing so avoids a certain amount of overhead required to support them.
To aid fuzzing efforts, `with-asan`, `with-fuzzer`, and `with-fuzzer-no-link` configure the build scripts responsible with compiling the underlying backing engines (e.g. LMDB) to build with these LLMV features enabled. Please refer to the official LLVM/Clang documentation on them for more informatiuon. These features are also disabled by default.
The project includes unit and doc tests embedded in the `src/` files, integration tests in the `tests/` subdirectory, and usage examples in the `examples/` subdirectory. To ensure your changes don't break examples, also run them via the run-all-examples.sh shell script:
Note: the test fixtures in the `tests/envs/` subdirectory aren't included in the package published to crates.io, so you must clone this repository in order to run the tests that depend on those fixtures or use the `rand` and `dump` executables to recreate them.
Of the various open source archetypes described in [A Framework for Purposeful Open Source](https://medium.com/mozilla-open-innovation/whats-your-open-source-strategy-here-are-10-answers-383221b3f9d3), the rkv project most closely resembles the Specialty Library, and we welcome contributions. Please report problems or ask questions using this repo's GitHub [issue tracker](https://github.com/mozilla/rkv/issues) and submit [pull requests](https://github.com/mozilla/rkv/pulls) for code and documentation changes.
rkv relies on the latest [rustfmt](https://github.com/rust-lang-nursery/rustfmt) for code formatting, so please make sure your pull request passes the rustfmt before submitting it for review. See rustfmt's [quick start](https://github.com/rust-lang-nursery/rustfmt#quick-start) for installation details.
We follow Mozilla's [Community Participation Guidelines](https://www.mozilla.org/en-US/about/governance/policies/participation/) while contributing to this project.
The rkv source code is licensed under the Apache License, Version 2.0, as described in the [LICENSE](https://github.com/mozilla/rkv/blob/master/LICENSE) file.