#document-database #database

bin+lib bonsaidb

A programmable, ACID-compliant, document-database inspired by CouchDB

8 releases (4 breaking)

0.4.1 Apr 5, 2022
0.4.0 Mar 29, 2022
0.3.0 Mar 3, 2022
0.2.0 Feb 18, 2022
0.0.0-reserve.0 Jul 16, 2021

#41 in Database implementations

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Used in 2 crates


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BonsaiDb forbids unsafe code BonsaiDb is considered alpha crate version Live Build Status HTML Coverage Report for v0.4.1 Documentation for v0.4.1

BonsaiDb is a developer-friendly document database for Rust that grows with you. It offers many features out of the box that many developers need:

  • ACID-compliant, transactional storage of Collections
  • Atomic Key-Value storage with configurable delayed persistence (similar to Redis)
  • At-rest Encryption
  • Backup/Restore
  • Role-Based Access Control (RBAC)
  • Local-only access, networked access via QUIC, or networked access via WebSockets
  • And much more.

⚠️ Status of this project

BonsaiDb is considered alpha software. It is under active development (GitHub commit activity). There may still be bugs that result in data loss. All users should regularly back up their data and test that restoring from backup works correctly.


To get an idea of how it works, let's review the view-examples example. See the examples README for a list of all available examples.

The view-examples example shows how to define a simple schema containing a single collection (Shape), a view to query the Shapes by their number_of_sides (ShapesByNumberOfSides), and demonstrates multiple ways to query that view.

First, here's how the schema is defined:

#[derive(Debug, Serialize, Deserialize, Collection)]
#[collection(name = "shapes", views = [ShapesByNumberOfSides])]
struct Shape {
    pub sides: u32,

#[derive(Debug, Clone, View)]
#[view(collection = Shape, key = u32, value = usize, name = "by-number-of-sides")]
struct ShapesByNumberOfSides;

impl CollectionViewSchema for ShapesByNumberOfSides {
    type View = Self;

    fn map(&self, document: CollectionDocument<Shape>) -> ViewMapResult<Self::View> {
            .emit_key_and_value(document.contents.sides, 1)

    fn reduce(
        mappings: &[ViewMappedValue<Self>],
        _rereduce: bool,
    ) -> ReduceResult<Self::View> {
        Ok(mappings.iter().map(|m| m.value).sum())

After you have your collection(s) and view(s) defined, you can open up a database and insert documents:

let db = Database::open::<Shape>(StorageConfiguration::new("view-examples.bonsaidb"))?;

// Insert a new document into the Shape collection.
Shape { sides: 3 }.push_into(&db)?;

And query data using the Map-Reduce-powered view:

let triangles = db.view::<ShapesByNumberOfSides>().with_key(3).query()?;
println!("Number of triangles: {}", triangles.len());

You can review the full example in the repository, or see all available examples in the examples README.

User's Guide

Our user's guide is early in development, but is available at: https://dev.bonsaidb.io/v0.4.1/guide/

Minimum Supported Rust Version (MSRV)

While this project is alpha, we are actively adopting the current version of Rust. The current minimum version is 1.58, and we plan on updating the MSRV to implement namespaced Features as soon as the feature is released.

Feature Flags

No feature flags are enabled by default in the bonsaidb crate. This is because in most Rust executables, you will only need a subset of the functionality. If you'd prefer to enable everything, you can use the full feature:

bonsaidb = { version = "*", default-features = false, features = "full" }
  • full: Enables local-full, server-full, and client-full.
  • cli: Enables the bonsaidb executable.
  • password-hashing: Enables the ability to use password authentication using Argon2 via AnyConnection.

Local databases only

bonsaidb = { version = "*", default-features = false, features = "local-full" }
  • local-full: Enables all the flags below
  • local: Enables the local module, which re-exports the crate bonsaidb-local.
  • local-async: Enables async support with Tokio.
  • local-cli: Enables the clap structures for embedding database management commands into your own command-line interface.
  • local-compression: Enables support for compressed storage using lz4.
  • local-encryption: Enables at-rest encryption.
  • local-instrument: Enables instrumenting with tracing.
  • local-password-hashing: Enables the ability to use password authentication using Argon2.

BonsaiDb server

bonsaidb = { version = "*", default-features = false, features = "server-full" }
  • server-full: Enables all the flags below,
  • server: Enables the server module, which re-exports the crate bonsaidb-server.
  • server-acme: Enables automtic certificate acquisition through ACME/LetsEncrypt.
  • server-cli: Enables the cli module.
  • server-compression: Enables support for compressed storage using lz4.
  • server-encryption: Enables at-rest encryption.
  • server-hyper: Enables convenience functions for upgrading websockets using hyper.
  • server-instrument: Enables instrumenting with tracing.
  • server-pem: Enables the ability to install a certificate using the PEM format.
  • server-websockets: Enables WebSocket support.
  • server-password-hashing: Enables the ability to use password authentication using Argon2.

Client for accessing a BonsaiDb server

bonsaidb = { version = "*", default-features = false, features = "client-full" }
  • client-full: Enables client, client-trusted-dns, client-websockets, and client-password-hashing.
  • client: Enables the client module, which re-exports the crate bonsaidb-client.
  • client-trusted-dns: Enables using trust-dns for DNS resolution. If not enabled, all DNS resolution is done with the OS's default name resolver.
  • client-websockets: Enables WebSocket support for bonsaidb-client.
  • client-password-hashing: Enables the ability to use password authentication using Argon2.

Developing BonsaiDb

Writing Unit Tests

Unless there is a good reason not to, every feature in BonsaiDb should have thorough unit tests. Many tests are implemented in bonsaidb_core::test_util via a macro that allows the suite to run using various methods of accessing BonsaiDb.

Some features aren't able to be tested using the Connection, StorageConnection, KeyValue, and PubSub traits only. If that's the case, you should add tests to whichever crates makes the most sense to test the code. For example, if it's a feature that only can be used in bonsaidb-server, the test should be somewhere in the bonsaidb-server crate.

Tests that require both a client and server can be added to the core-suite test file in the bonsaidb crate.

Checking Syntax

We use clippy to give additional guidance on our code. Clippy should always return with no errors, regardless of feature flags being enabled:

cargo clippy --all-features

Running all tests

Our CI processes require that some commands succeed without warnings or errors. These checks can be performed manually by running:

cargo xtask test --fail-on-warnings

Or, if you would like to run all these checks before each commit, you can install the check as a pre-commit hook:

cargo xtask install-pre-commit-hook

Formatting Code

We have a custom rustfmt configuration that enables several options only available in nightly builds:

cargo +nightly fmt

Open-source Licenses

This project, like all projects from Khonsu Labs, are open-source. This repository is available under the MIT License or the Apache License 2.0.

To learn more about contributing, please see CONTRIBUTING.md.


~380K SLoC