GodMode (Core)

GodMode is a testing tool that allows you to easily modify the state of the Ethereum Virtual Machine. With the power of GodMode you can test the robustness of Ethereum protocols/smart contracts and run simulations.

This library provides a truffle framework friendly API and lets you install pre-compiled GodMode contracts for popular protocols such as MakerDao, Uniswap, and Compound.

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Installation

npm install --save-dev @xgm/godmode

When using this library, you need to run GodMode Ganache CLI as well.

• GODMODE Ganache-cli
• See also: GODMODE Ganache-core

Usage

Getting started

To see a sample project that uses this library, see this repo:

• GODMODE Sample Project

Setting it up in the test environment

In your javascript test file, import the library

const { GM } = require('@xgm/godmode');

Initialize it with the GodMode Ganache endpoint (referenced above). The first argument indicates the network name -- use mainnet if you want to use pre-compiled contracts.

const provider = 'ws://localhost:8545'; // from godmode-ganache-cli
let GODMODE = new GM('dev', provider);

General interactions

await GODMODE.execute(
  targetContract.address, // Address of the deployed contract
  gmContract.abi, // ABI of the GM version of the contract
  gmContract.deployedBytecode, // Runtime bytecode of the GM contract
  "methodName", // Method to call in GM contract
  {
    args: [...], // List of method arguments. Order matters!
    from: txSender // Ethereum address of msg.sender
  }
);

Install pre-compiled protocol contracts

IMPORTANT: this only works on mainnet fork

When you install a protocol, all of the contracts for that protocol will be stored in your build/protocols directory. This is where godmode will look for them.

• Install all GM protocols

npx godmode install --all

• Install protocols from command line

npx godmode install --protocols Maker Compound UniswapV2

• Install protocols from package.json

"godmode": {
  "protocols": [
    "Maker",
    "Compound",
    "UniswapV2"
  ]
}

npx godmode install

MakerDao

• Mint DAI to an address: await GODMODE.Maker.mintDai(Alex, 10000);

Uniswap

• Enable Fee collection in UniswapV2: await GODMODE.UniswapV2.Factory_setFeeTo(Beth);

Compound

• Give the address cTokens: await GODMODE.Compound.mintCErc20("0x6c8c6b02e7b2be14d4fa6022dfd6d75921d90e4e", Carl, 100);

Testing

Tests are written in mocha.

npm run test

Contributing

Fork this repo and create a descriptive PR.

Releases

GodMode is in alpha so releases may be frequent. Core devs should create releases after merging in new features by running

npm run dist && npm run release

This will ask you for the release version, then automatically create a release and publish it to npm.