Mainstay is a framework for Solana's Sealevel runtime providing several convenient developer tools for writing smart contracts.

• Rust eDSL for writing Solana programs
• IDL specification
• TypeScript package for generating clients from IDL
• CLI and workspace management for developing complete applications

If you're familiar with developing in Ethereum's Solidity, Truffle, web3.js, then the experience will be familiar. Although the DSL syntax and semantics are targeted at Solana, the high level flow of writing RPC request handlers, emitting an IDL, and generating clients from IDL is the same.

Getting Started

For a quickstart guide and in depth tutorials, see the mainstay book and the older documentation that is being phased out. To jump straight to examples, go here. For the latest Rust and TypeScript API documentation, see docs.rs and the typedoc.

Packages

Package	Description	Version	Docs
mainstay-lang	Rust primitives for writing programs on Solana
mainstay-spl	CPI clients for SPL programs on Solana
mainstay-client	Rust client for Mainstay programs
@nx-pkg/mainstay	TypeScript client for Mainstay programs
@nx-pkg/mainstay-cli	CLI to support building and managing an Mainstay workspace

Note

• Mainstay is in active development, so all APIs are subject to change.
• This code is unaudited. Use at your own risk.

Examples

Here's a counter program, where only the designated authority can increment the count.

use mainstay_lang::prelude::*;

declare_id!("Fg6PaFpoGXkYsidMpWTK6W2BeZ7FEfcYkg476zPFsLnS");

#[program]
mod counter {
    use super::*;

    pub fn initialize(ctx: Context<Initialize>, start: u64) -> Result<()> {
        let counter = &mut ctx.accounts.counter;
        counter.authority = *ctx.accounts.authority.key;
        counter.count = start;
        Ok(())
    }

    pub fn increment(ctx: Context<Increment>) -> Result<()> {
        let counter = &mut ctx.accounts.counter;
        counter.count += 1;
        Ok(())
    }
}

#[derive(Accounts)]
pub struct Initialize<'info> {
    #[account(init, payer = authority, space = 48)]
    pub counter: Account<'info, Counter>,
    pub authority: Signer<'info>,
    pub system_program: Program<'info, System>,
}

#[derive(Accounts)]
pub struct Increment<'info> {
    #[account(mut, has_one = authority)]
    pub counter: Account<'info, Counter>,
    pub authority: Signer<'info>,
}

#[account]
pub struct Counter {
    pub authority: Pubkey,
    pub count: u64,
}

For more, see the examples and tests directories.

License

Mainstay is licensed under Apache 2.0.

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in Mainstay by you, as defined in the Apache-2.0 license, shall be licensed as above, without any additional terms or conditions.

Contribution

Thank you for your interest in contributing to Mainstay! Please see the CONTRIBUTING.md to learn how.

Thanks ❤️