- 水龙头
- 从 https://cloud.google.com/application/web3/faucet/ethereum 领取 0.05 Sepolia ETH
- 从 https://portal.arbitrum.io/bridge 跨链体桥转到 Sepolia Arbitrum
- 配置 rust 环境，包括：
- cargo
- rustup
- Rust Rover 导入 cargo home 以及 rust lib
- 编写代码，和链上合约交互
use alloy::providers::{Provider, ProviderBuilder};
use alloy::primitives::Address;
use std::error::Error;
use alloy::sol;
sol! {
#[sol(rpc)]
contract HelloWorldWeb3 {
function hello_web3() pure public returns (string memory);
}
}
#[tokio::main]
async fn main() -> Result<(), Box<dyn Error>> {
let rpc_url = "https://arbitrum-sepolia-rpc.publicnode.com".parse()?;
let provider = ProviderBuilder::new().connect_http(rpc_url);
let latest_block = provider.get_block_number().await?;
println!("latest block: {:?}", latest_block);
println!("Hello, world, Web3!");
// 远程部署好的合约
let contarct_address: Address = "0x3f1f78ED98Cd180794f1346F5bD379D5Ec47DE90".parse()?;
// 这个合约里的一个函数
let contract = HelloWorldWeb3::new(contarct_address, provider);
let result = contract.hello_web3().call().await?;
println!("return of the contract: {}", result);
Ok(())
}- 运行代码
cargo run- 结果
export MY_ARB_ADDRESS="0x......"编写代码：
// task2: 查询自己的余额
async fn task_2() -> Result<(), Box<dyn Error>> {
// arb sepolia rpc
let rpc_url = "https://arbitrum-sepolia-rpc.publicnode.com";
let provider: EthersProvider<Http> = EthersProvider::<Http>::try_from(rpc_url)?;
// 查询余额
let address_str = env::var("MY_ARB_ADDRESS")?;
let address: EthAddress = address_str.parse()?;
let balance_wei = provider.get_balance(address, None).await?;
// wei -> ETH
let balance_eth = format_ether(balance_wei);
println!("Address: {:?}", address);
println!("Balance: {} ETH", balance_eth);
Ok(())
}
Gas Fee = Gas Price × Gas Limit
• Gas Price：通过 ethers-rs 从 RPC 动态获取
• Gas Limit：ETH 基础转账行业通用值 → 21000
编写代码：
// task 3: 计算 arbitrum gas 费用
async fn task_3() -> Result<(), Box<dyn Error>> {
// Gas Fee = Gas Price × Gas Limit
// Arbitrum Sepolia RPC
let rpc_url = "https://arbitrum-sepolia-rpc.publicnode.com";
let provider = EthersProvider::<Http>::try_from(rpc_url)?;
// 动态获取当前 Gas Price - 单位：wei
let gas_price: U256 = provider.get_gas_price().await?;
println!("Current Gas Price: {} wei", gas_price);
// 基础 ETH 转账 Gas Limit（行业通用值）
let gas_limit: U256 = U256::from(21_000u64);
// 3计算 Gas 费用
let gas_fee_wei = gas_price * gas_limit;
let gas_fee_eth = format_ether(gas_fee_wei);
println!("Gas Limit (transfer): {}", gas_limit);
println!("Estimated Gas Fee: {} wei", gas_fee_wei);
println!("Estimated Gas Fee: {} ETH", gas_fee_eth);
Ok(())
}
async fn task_4() -> Result<()> {
// 1. 初始化 RPC 提供者
let rpc_url = "https://arbitrum-sepolia-rpc.publicnode.com";
let provider: Provider<Http> = Provider::<Http>::try_from(rpc_url)?
.interval(std::time::Duration::from_millis(500));
// 2. 从环境变量读取私钥和目标地址
let private_key = env::var("ARB_PRIVATE_KEY")
.map_err(|e| eyre!("Failed to read ARB_PRIVATE_KEY: {}", e))?;
let another_address_str = env::var("ANOTHER_ARB_ADDRESS")
.map_err(|e| eyre!("Failed to read ANOTHER_ARB_ADDRESS: {}", e))?;
// 3. 初始化钱包和签名客户端
let chain_id = 421614u64;
let wallet: LocalWallet = private_key.parse::<LocalWallet>()
.map_err(|e| eyre!("Invalid private key: {}", e))?
.with_chain_id(chain_id);
let client: Arc<SignerMiddleware<Provider<Http>, LocalWallet>> =
Arc::new(SignerMiddleware::new(provider.clone(), wallet));
// 4. 准备转账参数
let from = client.address();
let to: Address = another_address_str.parse()
.map_err(|e| eyre!("Invalid target address: {}", e))?;
let to = NameOrAddress::Address(to);
// 5. 检查余额
let balance = client.get_balance(from, None).await?;
let value = parse_ether("0.01")?;
if balance < value {
return Err(eyre!("Insufficient balance: have {}, need {}", balance, value));
}
// 6. 计算 gas 参数（EIP-1559）
let gas_price = client.get_gas_price().await?;
let max_priority_fee = U256::from(1_000_000_000u64); // 1 Gwei
let max_fee = gas_price + max_priority_fee;
// 7. 构建并发送交易
let tx = Eip1559TransactionRequest {
to: Some(to),
value: Some(value),
gas: Some(21_000.into()), // 普通转账固定 gas 21000
max_priority_fee_per_gas: Some(max_priority_fee),
max_fee_per_gas: Some(max_fee),
..Default::default()
};
let pending_tx = client.send_transaction(tx, None).await?;
println!("Tx sent! Hash: {:?}", pending_tx.tx_hash());
// 8. 等待交易上链并打印结果
let receipt = pending_tx.await?;
match receipt {
Some(r) => println!("Tx mined in block: {:?}", r.block_number),
None => println!("Tx was dropped or not mined yet"),
}
Ok(())
}
WETH 在 ARBISCAN 上的地址： https://sepolia.arbiscan.io/address/0x980B62Da83eFf3D4576C647993b0c1D7faf17c73
async fn task_5() -> Result<(), Box<dyn Error>> {
// 测试网 rpc
let rpc_url = "https://arbitrum-sepolia-rpc.publicnode.com";
let provider: Provider<Http> = Provider::<Http>::try_from(rpc_url)?
.interval(std::time::Duration::from_millis(500));
let provider = Arc::new(provider);
// 开源 arb 测试网合约
let contract_address: Address = "0x980B62Da83eFf3D4576C647993b0c1D7faf17c73".parse()?;
// 绑定合约
let weth = WETH::new(contract_address, provider);
// 调用只读方法
let name = weth.name().call().await?;
let symbol = weth.symbol().call().await?;
let decimals = weth.decimals().call().await?;
let total_supply = weth.total_supply().call().await?;
println!("Token name : {}", name);
println!("Token symbol : {}", symbol);
println!("Decimals : {}", decimals);
println!(
"Total supply : {}",
ethers::utils::format_units(total_supply, decimals as usize)?
);
Ok(())
}