GasSavingPool

Main Contract: ./contracts/GasSavingPool/impl/

GSP is a advanced version of DODO V2 DSP. The whole contracts of GSP uses solidity 0.8.16 version. It provides user with two methods to swap, including sellBase and sellQuote. Same as DSP, GSP supports flashloan. Compared with of DSP and UniV3, GSP can perform swap at a cost of much lower gas fee.

GSP add two features:

• Admin can adjust oracle price and price limit. There are two functions:

1. adjustPrice(): Admin adjust oracle price
2. adjustPriceLimit(): Set price limit which limit the price change amplitude. The relative ratio of the newly set price to the old price cannot exceed this value, with the unit being 1e6. The default value is 1e3, meaning the relative price change amplitude cannot exceed 1e3/1e6 = 0.1%.

• Maintainer need to claim mtFee in pool

Inheritaged a template using Foundry && HardHat architecture. We use foundry test.

Diff Report from DSP

link: https://www.diffchecker.com/Cl4eG2Xg/

Audit Report

link: DODO_GSP_Audit_Report

Test

The test of GSP implemets Foundry framework, and you can run the test using Foundry test command.

The test should be runned with forking ETH mainnet. You can set an env. first, then run the tests with --fork-url $ETH_RPC_URL .

Motivation

With this new architecture, we can get:

• Unit tests written in solidity
• Foundry's cast
• Integration testing with Hardhat
• Hardhat deploy & verify
• Typescript

Foundry

Foundry is a blazing fast, portable and modular toolkit for Ethereum application development written in Rust.

Foundry consists of:

• Forge: Ethereum testing framework (like Truffle, Hardhat and Dapptools).
• Cast: Swiss army knife for interacting with EVM smart contracts, sending transactions and getting chain data.

Need help getting started with Foundry? Read the 📖 Foundry Book (WIP)!

Hardhat

Hardhat is an Ethereum development environment for professionals. It facilitates performing frequent tasks, such as running tests, automatically checking code for mistakes or interacting with a smart contract.

On Hardhat's website you will find:

• Guides to get started
• Hardhat Network
• Plugin list

Directory Structure

integration - "Hardhat integration tests"
lib - forge-std: "Test dependency"
scripts - "hardhat deploy scripts"
contracts - "Solidity contract"
test - "forge tests"
.env.example - "Expamle dot env"
.gitignore - "Ignore workfiles"
.gitmodules -  "Dependecy modules"
.solcover.js - "Configure coverage"
.solhint.json - "Configure solidity lint"
foundry.toml - "Configure foundry"
hardhat.config.ts - "Configure hardhat"
package.json - "Node dependencies"
README.md - "This file"
remappings.txt - "Forge dependcy mappings"
slither.config.json - "Configure slither"

Installation

Foundry

First run the command below to get foundryup, the Foundry toolchain installer:

curl -L https://foundry.paradigm.xyz | bash

If you do not want to use the redirect, feel free to manually download the foundryup installation script from here.

Then, in a new terminal session or after reloading your PATH, run it to get the latest forge and cast binaries:

foundryup

Advanced ways to use foundryup, and other documentation, can be found in the foundryup package. Happy forging!

Hardhat

npm install or yarn

Commands

Scripts available via `npm run-script`:
  compile
    npx hardhat compile
  coverage
    npx hardhat coverage --solcoverjs .solcover.js
  deploy
    npx hardhat run scripts/deploy.ts
  integration
    npx hardhat test
  verify
    npx hardhat verify

Hardhat Commands
  integration tests
    yarn integration
  coverage
    yarn coverage

Foundry Commands
  unit tests
    forge test
  coverage
    forge coverage

Adding dependency

Prefer npm packages when available and update the remappings.

Example

install: yarn add -D @openzeppelin/contracts

remapping: @openzeppelin/contracts=node_modules/@openzeppelin/contracts

import: import "@openzeppelin/contracts/token/ERC20/ERC20.sol";