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.
- Anvil: Local Ethereum node, akin to Ganache, Hardhat Network.
- Chisel: Fast, utilitarian, and verbose solidity REPL.
$ forge build$ forge test$ forge fmt$ forge snapshot$ anvil$ forge script script/Counter.s.sol:CounterScript --rpc-url <your_rpc_url> --private-key <your_private_key>$ cast <subcommand>$ forge --help
$ anvil --help
$ cast --helpFoundry DeFi Stablecoin .
DSCEngine Example Decentralized Stablecoin Example
About This project is meant to be a stablecoin where users can deposit WETH and WBTC in exchange for a token that will be pegged to the USD.
Foundry DeFi Stablecoin About Getting Started Requirements Quickstart Optional Gitpod Updates Usage Start a local node Deploy Deploy - Other Network Testing Test Coverage Deployment to a testnet or mainnet Scripts Estimate gas Formatting Slither Thank you! Getting Started Requirements git You'll know you did it right if you can run git --version and you see a response like git version x.x.x foundry You'll know you did it right if you can run forge --version and you see a response like forge 0.2.0 (816e00b 2023-03-16T00:05:26.396218Z) Quickstart git clone https://github.com/Cyfrin/foundry-defi-stablecoin-f23 cd foundry-defi-stablecoin-f23 forge build
Updates The latest version of openzeppelin-contracts has changes in the ERC20Mock file. To follow along with the course, you need to install version 4.8.3 which can be done by forge install openzeppelin/openzeppelin-contracts@v4.8.3 --no-commit instead of forge install openzeppelin/openzeppelin-contracts --no-commit Usage Start a local node make anvil Deploy This will default to your local node. You need to have it running in another terminal in order for it to deploy.
make deploy Deploy - Other Network See below
Testing We talk about 4 test tiers in the video.
Unit Integration Forked Staging In this repo we cover #1 and Fuzzing.
forge test Test Coverage forge coverage and for coverage based testing:
forge coverage --report debug Deployment to a testnet or mainnet Setup environment variables You'll want to set your SEPOLIA_RPC_URL and PRIVATE_KEY as environment variables. You can add them to a .env file, similar to what you see in .env.example.
PRIVATE_KEY: The private key of your account (like from metamask). NOTE: FOR DEVELOPMENT, PLEASE USE A KEY THAT DOESN'T HAVE ANY REAL FUNDS ASSOCIATED WITH IT. You can learn how to export it here. SEPOLIA_RPC_URL: This is url of the sepolia testnet node you're working with. You can get setup with one for free from Alchemy Optionally, add your ETHERSCAN_API_KEY if you want to verify your contract on Etherscan.
Get testnet ETH Head over to faucets.chain.link and get some testnet ETH. You should see the ETH show up in your metamask.
Deploy make deploy ARGS="--network sepolia" Scripts Instead of scripts, we can directly use the cast command to interact with the contract.
For example, on Sepolia:
Get some WETH cast send 0xdd13E55209Fd76AfE204dBda4007C227904f0a81 "deposit()" --value 0.1ether --rpc-url $SEPOLIA_RPC_URL --private-key $PRIVATE_KEY Approve the WETH cast send 0xdd13E55209Fd76AfE204dBda4007C227904f0a81 "approve(address,uint256)" 0x091EA0838eBD5b7ddA2F2A641B068d6D59639b98 1000000000000000000 --rpc-url $SEPOLIA_RPC_URL --private-key $PRIVATE_KEY Deposit and Mint DSC cast send 0x091EA0838eBD5b7ddA2F2A641B068d6D59639b98 "depositCollateralAndMintDsc(address,uint256,uint256)" 0xdd13E55209Fd76AfE204dBda4007C227904f0a81 100000000000000000 10000000000000000 --rpc-url $SEPOLIA_RPC_URL --private-key $PRIVATE_KEY Estimate gas You can estimate how much gas things cost by running:
forge snapshot And you'll see an output file called .gas-snapshot
Formatting To run code formatting:
forge fmt