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教程：部署您的第一个 SAVITRI-20 代币

本教程将引导您使用 SDK 在 Savitri Network 上部署同质化代币。

前提条件​

  • 正在运行的 Savitri 轻节点（参见 快速入门）
  • 已安装 Rust 工具链
  • 已充值的钱包（使用测试网水龙头）

1. 项目设置​

创建新的 Rust 项目：

cargo new my-savitri-token
cd my-savitri-token

在 Cargo.toml 中添加依赖项：

[dependencies]
savitri-sdk = { path = "../savitri-sdk" }
tokio = { version = "1", features = ["full"] }
anyhow = "1"
hex = "0.4"

2. 创建钱包​

use savitri_sdk::{Wallet, RpcClient};

#[tokio::main]
async fn main() -> anyhow::Result<()> {
    // Create or import a wallet
    let wallet = Wallet::new();
    println!("Your address: {}", wallet.address());

    // Connect to local node
    let client = RpcClient::from_url("http://localhost:8545")?;

    // Check if node is running
    let health = client.health().await?;
    println!("Connected to {} ({})", health.service, health.mode);

    Ok(())
}

3. 为钱包充值​

通过水龙头领取测试网代币：

let claim = client.faucet_claim(wallet.address()).await?;
println!("Received {} SAVT (tx: {})", claim.amount, claim.tx_hash);

// Wait for confirmation
tokio::time::sleep(std::time::Duration::from_secs(10)).await;

// Verify balance
let account = client.get_account(wallet.address()).await?;
println!("Balance: {} (nonce: {})", account.balance, account.nonce);

4. 部署代币合约​

代币部署是一个 to = None、初始化数据放在 data 字段中的交易：

use savitri_sdk::TransactionBuilder;

// Encode token initialization parameters
fn encode_token_init(name: &str, symbol: &str, initial_supply: u128) -> Vec<u8> {
    let mut data = b"initialize_savitri20".to_vec();
    data.push(0); // separator

    // Name (length-prefixed)
    data.extend_from_slice(&(name.len() as u32).to_le_bytes());
    data.extend_from_slice(name.as_bytes());

    // Symbol (length-prefixed)
    data.extend_from_slice(&(symbol.len() as u32).to_le_bytes());
    data.extend_from_slice(symbol.as_bytes());

    // Initial supply (u128 LE)
    data.extend_from_slice(&initial_supply.to_le_bytes());

    data
}

// Build deploy transaction
let nonce = client.get_nonce(wallet.address()).await?;

let deploy_data = encode_token_init(
    "My Token",                              // name
    "MTK",                                   // symbol
    1_000_000_000_000_000_000_000_000,       // 1M tokens (18 decimals)
);

let deploy_tx = TransactionBuilder::new()
    // No .to() — indicates contract deployment
    .data(deploy_data)
    .value(0)
    .nonce(nonce)
    .fee(5_000_000_000_000_000) // 0.005 SAVT contract fee
    .build_and_sign(&wallet)?;

println!("Deploy TX built. Contract will be created at a derived address.");

5. 与代币交互​

部署完成后，使用 ContractClient 进行交互：

use savitri_sdk::ContractClient;

let contract = ContractClient::from_url_and_wallet(
    "http://localhost:8545",
    wallet.clone(),
)?;

// Transfer tokens
let tx_hash = contract.call_contract(
    &token_contract_address,
    b"transfer",
    &encode_transfer(&recipient_address, 1000_000_000_000_000_000), // 1000 tokens
    Some(0),
).await?;
println!("Transfer TX: {}", tx_hash);

6. 查询代币余额​

// Via RPC
let balance = client.call_raw(
    "account_getTokenBalance",
    serde_json::json!([wallet.address(), token_contract_address]),
).await?;
println!("Token balance: {}", balance);

代币标准快速参考​

标准使用场景关键函数
SAVITRI-20同质化代币transfer、approve、transferFrom
SAVITRI-721NFTmint、transferFrom、tokenURI
SAVITRI-1155多资产safeTransferFrom、balanceOfBatch

费用参考​

操作费用（SAVT）
代币部署0.005
代币转账0.005
代币授权0.005
NFT 铸造0.005
批量转账0.005

金额与小数位​

所有 Savitri 代币使用 18 位小数：

1 token     = 1_000_000_000_000_000_000  (10^18)
0.001 token = 1_000_000_000_000_000      (10^15)
1M tokens   = 1_000_000_000_000_000_000_000_000  (10^24)

后续步骤​