This project demonstrates an advanced Hardhat use case, integrating other tools commonly used alongside Hardhat in the ecosystem.
The project comes with a sample contract, a test for that contract, a sample script that deploys that contract, and an example of a task implementation, which simply lists the available accounts. It also comes with a variety of other tools, preconfigured to work with the project code.
Try running some of the following tasks:
npx hardhat accounts
npx hardhat compile
npx hardhat clean
npx hardhat test
npx hardhat node
npx hardhat help
REPORT_GAS=true npx hardhat test
npx hardhat coverage
npx hardhat run scripts/deploy.js
node scripts/deploy.js
npx eslint '**/*.js'
npx eslint '**/*.js' --fix
npx prettier '**/*.{json,sol,md}' --check
npx prettier '**/*.{json,sol,md}' --write
npx solhint 'contracts/**/*.sol'
npx solhint 'contracts/**/*.sol' --fixTo try out Etherscan verification, you first need to deploy a contract to an Ethereum network that's supported by Etherscan, such as Ropsten.
In this project, copy the .env.example file to a file named .env, and then edit it to fill in the details. Enter your Etherscan API key, your Ropsten node URL (eg from Alchemy), and the private key of the account which will send the deployment transaction. With a valid .env file in place, first deploy your contract:
hardhat run --network ropsten scripts/deploy.jsThen, copy the deployment address and paste it in to replace DEPLOYED_CONTRACT_ADDRESS in this command:
npx hardhat verify --network ropsten DEPLOYED_CONTRACT_ADDRESS "Hello, Hardhat!"This repository contains implementation of the protocol to exchange ERC20 compliant tokens using fully decentralized, on-chain order book and matching engine. The protocol is used by OasisDEX, eth2dai.com and many other DeFi projects.
./scripts/run-tests.sh # run unit tests
./scripts/run-live-tests.sh # runs tests against the mainnet
The protocol uses on-chain order book and matching engine. The primary advantage of such approach is that the liquidity is avaiable for other smart contracts that can access it in one atomic ethereum transaction. The second advantage is that the protocol is fully decentralized without any need for an operator.
Order book for each market is implemented as two double-linked sorted lists, one for each side of the market. At any one time the list should be sorted.
The second important design choice is the use of the Escrow model for Makers - every order on the order book needs to be "backed up" by the liquidity that is escrowed in the contract. Although such approach locks down liquidity, it guarantees zero-risk, instantenous settlement.
Please refer to https://oasisdex.com/docs/references/smart-contract