EVM Rust Emulator

The EVM Rust Emulator is a simple in-memory Ethereum Virtual Machine (EVM) emulator written in Rust. It is designed to be a lightweight and easy-to-use tool for developers who want to test EVM bytecode execution directly in a command line or in a Rust crate, without using a full EVM node with his RPC to interact with a blockchain.

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Rust crate

👉 Use the evm-rs-emulator crate in your rust project.

Install crate

cargo add evm-rs-emulator

Usage

use evm_rs_emulator::Runner;

fn main() {
let caller = [
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0xc4, 0x11, 0xe8,
];
let origin: Option<[u8; 20]> = None;
let address: Option<[u8; 20]> = None;
let value: Option<[u8; 32]> = None;
let data: Option<Vec<u8>> = None;
let bytecode: Vec<u8> = vec![0x60, 0xff, 0x60, 0xff];

// Create a new interpreter
let mut runner =
    Runner::new(caller, origin, address, value, data, None);

// Run all the bytecode
let _ = runner.interpret(bytecode.clone(), Some(255), true);

// Or run the bytecode OPCODE by OPCODE
runner.bytecode = bytecode;
runner.debug_level = Some(255);
// Run the first 3 opcodes
let _ = runner.interpret_op_code(runner.bytecode[runner.pc]);
let _ = runner.interpret_op_code(runner.bytecode[runner.pc]);
let _ = runner.interpret_op_code(runner.bytecode[runner.pc]);
}

Command line interface

👉 Use the evm-rs-emulator as a CLI.

Installation (UNIX-like OS)

Run this command to install evm-rs:

git clone https://github.com/Yashiru/evm-rs-emulator.git && \
  cd evm-rs-emulator && \
  ./install && cd .. && \
  rm -rf evm-rs-emulator

[!NOTE]
The install script runs sudo commands.

Uninstall

Remove the binary:

sudo rm -rf /usr/local/bin/evm-rs

Execute bytecode

You can run raw bytecode or give a file containing the bytecode in parameter.

[!NOTE]
When running some bytecode, the bytecode is deployed at a contract address and the contract is called with the provided data.

# Run bytecode in a file
evm-rs ./bytecode.bin

# Run raw bytecode
evm-rs 0x60ff60ff

Command Line Arguments

• --address
  Set the address of the contract containing the provided bytecode.

• --caller
  Set the caller address.

• --data
  Set the data to be passed to the contract.

• --origin
  Set the origin address.

• --value
  Set the value to be sent to the contract.

• --fork
  Set the fork RPC url to be used when local storage reads return nothing.

• --help
  Display the help message, listing available arguments and their usage.

• --version
  Display the current version of the CLI.

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🚧 Warning 🚧

This project is currently experimental and subject to frequent changes as we are still working on stabilizing EVM emulation. It has not been audited for security purposes and should not be used in production yet.

Missing features (Contributions welcome ❤️)

• EVM gas usage (see this branch)
• EVM gas price (display tx price using the fork)
• EVM gas limit
• Mocked data with RPC
  • Block data
  • Call to external contract
• External crate features
  • Deploy contract
  • Call contract
  • Get logs

Contributions

To contribute to the EVM Rust Emulator, you will need to have Rust and Cargo installed on your system.

curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh

Once you have these tools installed, you can clone the project.

git clone https://github.com/Yashiru/evm-rs-emulator.git

To run the tests, you can use the following command.

cargo test

To run the coverage task

cargo make cov

License

The underlying source code is free and unencumbered software released into the public domain. Check LICENSE file for more information.