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.
• Anvil: Local Ethereum node, akin to Ganache, Hardhat Network.
• Chisel: Fast, utilitarian, and verbose solidity REPL.

Documentation

https://book.getfoundry.sh/

Usage

Build

$ forge build

Test

$ forge test

Format

$ forge fmt

Gas Snapshots

$ forge snapshot

Anvil

$ anvil

Deploy

$ forge script script/Counter.s.sol:CounterScript --rpc-url <your_rpc_url> --private-key <your_private_key>

Cast

$ cast <subcommand>

Help

$ forge --help
$ anvil --help
$ cast --help

deployment command

$ forge create --rpc-url $RPC_URL --private-key $PVT_KEY ChoraClub --constructor-args-path ./op_args.json --etherscan-api-key $ETHERSCAN_APIKEY --verify --priority-gas-price 1000000

Why optimizer kept to 200 runs?

• Optimizer Limited to 200 Runs:

  • Gas Usage: 636,231 gas
  • Transaction Fee: 0.001990916022559779 ETH ($3.68) @ 3.000000256 Gwei
  • Bytecode Length (Char): 4,919 characters
  • Deploy Tx (200 runs)

• Optimizer Increased to 10,000,000 Runs:

  • Gas Usage: 764,202 gas
  • Transaction Fee: 0.00236498685805258 ETH ($4.38) @ 3.000000252 Gwei
  • Bytecode Length (Char): 5,144 characters
  • Deploy Tx (10,000,000 runs)

Explanation: When the optimizer is set to 10,000,000 runs, gas fees increase due to longer bytecode length. Therefore, keeping it limited to 200 runs helps maintain lower gas fees and a shorter bytecode length.

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.19;

import "@openzeppelin/contracts/access/Ownable.sol";
import "@ethereum-attestation-service/eas-contracts/contracts/resolver/SchemaResolver.sol";
import "@ethereum-attestation-service/eas-contracts/contracts/IEAS.sol";

/**
 * @title AttesterResolver
 * @notice A chora_club schema resolver that checks whether the attestation is from chora_club' address.
 * @custom:dev-run-script ./scripts/deploy_with_ethers.ts
 */
contract AttesterResolver is SchemaResolver, Ownable {
    address public targetAttester;

    constructor(
        IEAS _eas,
        address _targetAttester,
        address _initialOwner
    ) SchemaResolver(_eas) Ownable(_initialOwner) {
        targetAttester = _targetAttester;
    }

    function updateTargetAttester(address _newTargetAttester) public onlyOwner {
        targetAttester = _newTargetAttester;
    }

    function onAttest(
        Attestation calldata attestation,
        uint256 /*value*/
    ) internal view override returns (bool) {
        return attestation.attester == targetAttester;
    }

    function onRevoke(
        Attestation calldata, /*attestation*/
        uint256 /*value*/
    ) internal pure override returns (bool) {
        return false;
    }
}