Borsh in Rust

borsh-rs is Rust implementation of the Borsh binary serialization format.

Borsh stands for Binary Object Representation Serializer for Hashing. It is meant to be used in security-critical projects as it prioritizes consistency, safety, speed, and comes with a strict specification.

Example

use borsh::{BorshSerialize, BorshDeserialize};

#[derive(BorshSerialize, BorshDeserialize, PartialEq, Debug)]
struct A {
    x: u64,
    y: String,
}

#[test]
fn test_simple_struct() {
    let a = A {
        x: 3301,
        y: "liber primus".to_string(),
    };
    let encoded_a = a.try_to_vec().unwrap();
    let decoded_a = A::try_from_slice(&encoded_a).unwrap();
    assert_eq!(a, decoded_a);
}

Features

Opting out from Serde allows borsh to have some features that currently are not available for serde-compatible serializers. Currently we support two features: borsh_init and borsh_skip (the former one not available in Serde).

borsh_init allows to automatically run an initialization function right after deserialization. This adds a lot of convenience for objects that are architectured to be used as strictly immutable. Usage example:

#[derive(BorshSerialize, BorshDeserialize)]
#[borsh_init(init)]
struct Message {
    message: String,
    timestamp: u64,
    public_key: CryptoKey,
    signature: CryptoSignature
    hash: CryptoHash
}

impl Message {
    pub fn init(&mut self) {
        self.hash = CryptoHash::new().write_string(self.message).write_u64(self.timestamp);
        self.signature.verify(self.hash, self.public_key);
    }
}

borsh_skip allows to skip serializing/deserializing fields, assuming they implement Default trait, similary to #[serde(skip)].

#[derive(BorshSerialize, BorshDeserialize)]
struct A {
    x: u64,
    #[borsh_skip]
    y: f32,
}

Releasing

Before you release, make sure CHANGELOG.md is up to date.

Use cargo-workspaces to save time.

Bump Versions

cargo workspaces version --force 'borsh*' --exact --no-individual-tags patch

This will bump all the versions to the next "patch" release (see cargo workspaces version --help for more options), create a new commit, push v0.x.x tag, push to the master.

Publish

To publish on crates.io the version that is currently in git:

cargo workspaces publish --from-git --skip-published

Alternatively, you may want to combine the version bumping with publishing:

cargo workspaces publish --force 'borsh*' --exact --no-individual-tags patch

Release on GitHub

Navigate to the New Release page
Enter the tag name, e.g. v0.8.0
Write down the release log (basically, copy-paste from the CHANGELOG)
Publish the release

License

This repository is distributed under the terms of both the MIT license and the Apache License (Version 2.0). See LICENSE-MIT and LICENSE-APACHE for details.

borsh-derive-internal 0.9.0