quasar-svm

In-process Solana execution for Rust, Node.js, and Python.

Overview

QuasarSVM is a lightweight Solana virtual machine that executes transactions locally without an RPC connection or validator. Provide program ELFs, account state, and instructions — get back logs, compute units, return data, byte-level account diffs, and resulting accounts.

Account is the universal account type across all layers.

[dependencies]
quasar-svm = "0.1"

npm install @blueshift-gg/quasar-svm

pip install quasar-svm

Quick Start

Rust

use quasar_svm::{QuasarSvm, Pubkey, SPL_TOKEN_PROGRAM_ID};
use quasar_svm::token::*;
use spl_token::state::Account as SplTokenAccount;
use solana_program_pack::Pack;

let authority = Pubkey::new_unique();

let mint = create_keyed_mint_account(&Pubkey::new_unique(), &Mint { decimals: 6, supply: 10_000, ..Default::default() });
let alice = create_keyed_associated_token_account(&authority, &mint.address, 5_000);
let bob   = create_keyed_associated_token_account(&Pubkey::new_unique(), &mint.address, 0);

let ix = spl_token::instruction::transfer(
    &SPL_TOKEN_PROGRAM_ID,
    &alice.address,
    &bob.address,
    &authority,
    &[],
    1_000,
).unwrap();

let mut svm = QuasarSvm::new(); // Token program loaded by default

let result = svm.process_instruction(&ix, &[mint, alice, bob]);

result.assert_success();

// Verify by unpacking account data
let bob_account = result.account(&bob.address).unwrap();
let bob_token = SplTokenAccount::unpack(&bob_account.data).unwrap();
assert_eq!(bob_token.amount, 1_000);

TypeScript (web3.js)

import { QuasarSvm, createKeyedMintAccount, createKeyedAssociatedTokenAccount } from "@blueshift-gg/quasar-svm/web3.js";
import { Address } from "@solana/web3.js";
import { getTransferInstruction } from "@solana/spl-token";
import { getTokenDecoder } from "@solana-program/token";

const vm = new QuasarSvm(); // Token program loaded by default

const authority = new Address("11111111111111111111111111111112"); // Example address
const recipient = new Address("11111111111111111111111111111113");

const mint = createKeyedMintAccount(new Address("TokenMint111111111111111111111111111"), { decimals: 6, supply: 10_000n });
const alice = createKeyedAssociatedTokenAccount(authority, mint.accountId, 5_000n);
const bob = createKeyedAssociatedTokenAccount(recipient, mint.accountId, 0n);

const ix = getTransferInstruction({
  source: alice.accountId,
  destination: bob.accountId,
  owner: authority,
  amount: 1_000n,
});

const result = vm.processInstruction(ix, [mint, alice, bob]);

result.assertSuccess();
console.log(result.account(bob.accountId, getTokenDecoder())?.amount); // 1000n

TypeScript (kit)

import { QuasarSvm, createKeyedMintAccount, createKeyedAssociatedTokenAccount } from "@blueshift-gg/quasar-svm/kit";
import { address } from "@solana/addresses";
import { getTransferInstruction, getTokenDecoder } from "@solana-program/token";

const vm = new QuasarSvm(); // Token program loaded by default

const authority = address("11111111111111111111111111111112"); // Example address
const recipient = address("11111111111111111111111111111113");

const mint = createKeyedMintAccount(address("TokenMint111111111111111111111111111"), { decimals: 6, supply: 10_000n });
const alice = await createKeyedAssociatedTokenAccount(authority, mint.address, 5_000n);
const bob = await createKeyedAssociatedTokenAccount(recipient, mint.address, 0n);

const ix = getTransferInstruction({
  source: alice.address,
  destination: bob.address,
  owner: authority,
  amount: 1_000n,
});

const result = vm.processInstruction(ix, [mint, alice, bob]);

result.assertSuccess();
console.log(result.account(bob.address, getTokenDecoder())?.amount); // 1000n

Python

from quasar_svm import QuasarSvm, create_keyed_mint_account, create_keyed_associated_token_account
from solders.pubkey import Pubkey
from spl.token.instructions import transfer, TransferParams

# Token program loaded by default
with QuasarSvm() as svm:
    authority = Pubkey.new_unique()
    recipient = Pubkey.new_unique()

    # Create mint and token accounts
    mint = create_keyed_mint_account(
        Pubkey.new_unique(),
        mint_authority=authority,
        decimals=6,
        supply=10_000,
    )
    alice = create_keyed_associated_token_account(authority, mint.address, 5_000)
    bob = create_keyed_associated_token_account(recipient, mint.address, 0)

    # Transfer tokens
    ix = transfer(
        TransferParams(
            program_id=mint.owner,
            source=alice.address,
            dest=bob.address,
            owner=authority,
            amount=1_000,
        )
    )

    result = svm.process_instruction(ix, [mint, alice, bob])
    result.assert_success()

    # Verify transfer
    bob_account = result.account(bob.address)
    print(f"Bob's balance: {bob_account.data[64:72]}")  # Token amount at offset 64

TypeScript: Native memory is freed automatically by the GC. For deterministic cleanup in tight loops, use using vm = new QuasarSvm() or call vm.free().

Python: Use context manager (with QuasarSvm() as svm:) for automatic cleanup.

Documentation

Exports

All APIs expose the same core functionality with idiomatic types for each language. The web3.js layer additionally provides toKeyedAccountInfo / fromKeyedAccountInfo for interop with legacy code.

Workspace

Built-in Programs

The system program, BPF Loader v2, and Upgradeable Loader v3 are always available. SPL programs are bundled and loaded by default.

Rust:

// All SPL programs loaded by default
let svm = QuasarSvm::new();

// Or customize via config
use quasar_svm::QuasarSvmConfig;
let svm = QuasarSvm::new_with_config(QuasarSvmConfig {
    token: true,
    token_2022: false,
    associated_token: true,
});

// Or use builder methods
QuasarSvm::new()
    .with_token_program()
    .with_token_2022_program()
    .with_associated_token_program();

TypeScript:

// All SPL programs loaded by default
const vm = new QuasarSvm();

// Or customize via config
const vm = new QuasarSvm({
  token: true,
  token2022: false,
  associatedToken: true,
});

Development

This repository uses Bun for the TypeScript toolchain and package management.

bun install

# Rust
cargo check --workspace
cargo clippy --workspace

# TypeScript
bun run build
bun run build:native
bun run test

License

MIT