Solana Program Library

The Solana Program Library (SPL) is a collection of on-chain programs targeting the Sealevel parallel runtime. These programs are tested against Solana's implementation of Sealevel, solana-runtime, and some are deployed to Mainnet Beta. As others implement Sealevel, we will graciously accept patches to ensure the programs here are portable across all implementations.

For more information see the SPL documentation and the Token TypeDocs.

Deployments

Only a subset of programs within the Solana Program Library repo are deployed to the Solana Mainnet Beta. Currently, this includes:

In addition, one program is planned for deployment to Solana Mainnet Beta:

Audits

Only a subset of programs within the Solana Program Library repo are audited. Currently, this includes:

All other programs may be updated from time to time. These programs are not audited, so fork and deploy them at your own risk. Here is the full list of unaudited programs:

• binary-option
• binary-oracle-pair
• feature-proposal
• instruction-padding
• managed-token
• name-service
• record
• stateless-asks
• token-lending
• token-swap
• token-upgrade

More information about the repository's security policy at SECURITY.md.

The security-audits repo contains all past and present program audits.

Migrated Packages

The Solana Program Library repository is being broken up into separate repos for each program and set of clients. The following programs have been moved:

• Memo

Program Packages

Package	Description	Version	Docs
spl-token	ERC20-like token program on Solana
spl-token-2022	Token program compatible with spl-token, with extensions
spl-associated-token-account	Stateless protocol defining a canonical "associated" token account for a wallet
spl-governance	DAO program using tokens for voting
spl-account-compression	Program for managing compressed accounts stored in an off-chain merkle tree
spl-feature-proposal	Program using tokens to vote on enabling Solana network features
spl-noop	Program that does nothing, used for logging instruction data
spl-name-service	Program for managing ownership of data on-chain
spl-shared-memory	Program for sharing data between programs
spl-stake-pool	Program for pooling stake accounts, managed by another entity
spl-instruction-padding	Program to padding to other instructions
spl-concurrent-merkle-tree	Library for on-chain representation of merkle tree
spl-math	Library for on-chain math
spl-token-lending	Over-collateralized lending program for tokens
spl-token-swap	AMM for trading tokens
spl-token-upgrade	Protocol for burning one token type in exchange for another

CLI Packages

Package	Description	Version
spl-token-cli	CLI for the token, token-2022, and associated-token-account programs
spl-stake-pool-cli	CLI for the stake-pool program
spl-feature-proposal-cli	CLI for the feature-proposal program
spl-token-lending-cli	CLI for the token-lending program
spl-token-upgrade-cli	CLI for the token-upgrade program

JavaScript Packages

Package	Description	Version	Docs
@solana/spl-token	Bindings for the token, token-2022, and associated-token-account programs
@solana/spl-governance	Bindings for the governance program		N/A
@solana/spl-account-compression	Bindings for the account-compression program
@solana/spl-name-service	Bindings for the name-service program		N/A
@solana/spl-stake-pool	Bindings for the stake-pool program		N/A
@solana/spl-token-lending	Bindings for the token-lending program		N/A
@solana/spl-token-swap	Bindings for the token-swap program		N/A

Development

Environment Setup

1. Install the latest Solana tools.
2. Install the latest Rust stable. If you already have Rust, run rustup update to get the latest version.
3. Install the libudev development package for your distribution (libudev-dev on Debian-derived distros, libudev-devel on Redhat-derived).

Build

Build on-chain programs

# To build all on-chain programs
$ cargo build-sbf

# To build a specific on-chain program
$ cd <program_name>/program
$ cargo build-sbf

Build clients

# To build all clients
$ cargo build

# To build a specific client
$ cd <program_name>/cli
$ cargo build

Test

Unit tests contained within all projects can be run with:

$ cargo test      # <-- runs host-based tests
$ cargo test-sbf  # <-- runs BPF program tests

To run a specific program's tests, such as SPL Token:

$ cd token/program
$ cargo test      # <-- runs host-based tests
$ cargo test-sbf  # <-- runs BPF program tests

Integration testing may be performed via the per-project .js bindings. See the token program's js project for an example.

Common Issues

Solutions to a few issues you might run into are mentioned here.

1. Failed to open: ../../deploy/spl_<program-name>.so

   Update your Rust and Cargo to the latest versions and re-run cargo build-sbf in the relevant <program-name> directory, or run it at the repository root to rebuild all on-chain programs.

2. Error while loading shared libraries. (libssl.so.1.1)

   A working solution was mentioned here. Install libssl.

   wget http://nz2.archive.ubuntu.com/ubuntu/pool/main/o/openssl/libssl1.1_1.1.1l-1ubuntu1.2_amd64.deb
   sudo dpkg -i libssl1.1_1.1.1l-1ubuntu1.2_amd64.deb
   

3. CPU or Memory usage at 100%

   This is to be expected while building some of the programs in this library. The simplest solution is to add the --jobs 1 flag to the build commands to limit the number of parallel jobs to 1 and check if that fixes the issue. Although this will mean much longer build times.

Clippy

$ cargo clippy

Coverage

$ ./coverage.sh  # Help wanted! Coverage build currently fails on MacOS due to an XCode `grcov` mismatch...

MacOS

You may need to pin your grcov version, and then rustup with the apple-darwin nightly toolchain:

$ cargo install grcov --version 0.6.1
$ rustup toolchain install nightly-x86_64-apple-darwin

Release Process

SPL programs are currently tagged and released manually. Each program is versioned independently of the others, with all new development occurring on master. Once a program is tested and deemed ready for release:

Bump Version

• Increment the version number in the program's Cargo.toml
• Run cargo build-sbf <program> to build binary. Note the location of the generated spl_<program>.so for attaching to the GitHub release.
• Open a PR with these version changes and merge after passing CI.

Create GitHub tag

Program tags are of the form <program>-vX.Y.Z. Create the new tag at the version-bump commit and push to the solana-program-library repository, eg:

$ git tag token-v1.0.0 b24bfe7
$ git push upstream --tags

Publish GitHub release

• Go to GitHub Releases UI
• Click "Draft new release", and enter the new tag in the "Tag version" box.
• Title the release "SPL vX.Y.Z", complete the description, and attach the spl_<program>.so binary
• Click "Publish release"

Publish to Crates.io

Navigate to the program directory and run cargo package to test the build. Then run cargo publish.

Disclaimer

All claims, content, designs, algorithms, estimates, roadmaps, specifications, and performance measurements described in this project are done with the Solana Labs, Inc. (“SL”) best efforts. It is up to the reader to check and validate their accuracy and truthfulness. Furthermore nothing in this project constitutes a solicitation for investment.

Any content produced by SL or developer resources that SL provides, are for educational and inspiration purposes only. SL does not encourage, induce or sanction the deployment, integration or use of any such applications (including the code comprising the Solana blockchain protocol) in violation of applicable laws or regulations and hereby prohibits any such deployment, integration or use. This includes use of any such applications by the reader (a) in violation of export control or sanctions laws of the United States or any other applicable jurisdiction, (b) if the reader is located in or ordinarily resident in a country or territory subject to comprehensive sanctions administered by the U.S. Office of Foreign Assets Control (OFAC), or (c) if the reader is or is working on behalf of a Specially Designated National (SDN) or a person subject to similar blocking or denied party prohibitions.

The reader should be aware that U.S. export control and sanctions laws prohibit U.S. persons (and other persons that are subject to such laws) from transacting with persons in certain countries and territories or that are on the SDN list. Accordingly, there is a risk to individuals that other persons using any of the code contained in this repo, or a derivation thereof, may be sanctioned persons and that transactions with such persons would be a violation of U.S. export controls and sanctions law.

lib.rs:

Concurrent Merkle Tree

This crate is a Solana-optimized implementation of the concurrent merkle tree data structure introduced in this whitepaper

The core implementation of CMT can be found in [concurrent_merkle_tree]