전송 수수료

TransferFeeExtension 구현 방법

TransferFeeExtension는 모든 토큰 전송에서 자동 수수료 징수를 가능하게 합니다. 수수료는 수신자 token account에 축적되며 mint account에 설정된 출금 권한자가 인출할 수 있습니다.

타입스크립트

import { getCreateAccountInstruction } from "@solana-program/system";
import {
extension,
getInitializeAccountInstruction,
getInitializeMintInstruction,
getInitializeTransferFeeConfigInstruction,
getMintSize,
getTokenSize,
TOKEN_2022_PROGRAM_ADDRESS
} from "@solana-program/token-2022";
import {
airdropFactory,
appendTransactionMessageInstructions,
createSolanaRpc,
createSolanaRpcSubscriptions,
createTransactionMessage,
generateKeyPairSigner,
getSignatureFromTransaction,
lamports,
pipe,
sendAndConfirmTransactionFactory,
setTransactionMessageFeePayerSigner,
setTransactionMessageLifetimeUsingBlockhash,
signTransactionMessageWithSigners
} from "@solana/kit";
// Create Connection, local validator in this example
const rpc = createSolanaRpc("http://localhost:8899");
const rpcSubscriptions = createSolanaRpcSubscriptions("ws://localhost:8900");
// Generate the authority for the mint (also acts as fee payer)
const authority = await generateKeyPairSigner();
// Fund authority/fee payer
await airdropFactory({ rpc, rpcSubscriptions })({
recipientAddress: authority.address,
lamports: lamports(5_000_000_000n), // 5 SOL
commitment: "confirmed"
});
// Generate keypair to use as address of mint
const mint = await generateKeyPairSigner();
// And a transfer fee config extension.
const transferFees = {
epoch: 0n,
maximumFee: 1_000_000n,
transferFeeBasisPoints: 150 // 1.5%
};
const transferFeeConfigExtension = extension("TransferFeeConfig", {
transferFeeConfigAuthority: authority.address,
withdrawWithheldAuthority: authority.address,
withheldAmount: 0n,
newerTransferFee: transferFees,
// Used for transitioning configs. Starts by being the same as newerTransferFee.
olderTransferFee: transferFees
});
// Get mint account size with transfer fee extension
const space = BigInt(getMintSize([transferFeeConfigExtension]));
// Get minimum balance for rent exemption
const rent = await rpc.getMinimumBalanceForRentExemption(space).send();
// Get latest blockhash to include in transaction
const { value: latestBlockhash } = await rpc.getLatestBlockhash().send();
// Instruction to create new account for mint (token program)
// Invokes the system program
const createMintAccountInstruction = getCreateAccountInstruction({
payer: authority,
newAccount: mint,
lamports: rent,
space,
programAddress: TOKEN_2022_PROGRAM_ADDRESS
});
// Instruction to initialize transfer fee config extension
const initializeTransferFeeConfigInstruction =
getInitializeTransferFeeConfigInstruction({
mint: mint.address,
transferFeeConfigAuthority: authority.address,
withdrawWithheldAuthority: authority.address,
transferFeeBasisPoints: 100, // 1% fee
maximumFee: 1_000_000n // Maximum fee of 1 token
});
// Instruction to initialize mint account data
// Invokes the token22 program
const initializeMintInstruction = getInitializeMintInstruction({
mint: mint.address,
decimals: 6,
mintAuthority: authority.address,
freezeAuthority: authority.address
});
// Generate keypair to use as address of token account
const tokenAccount = await generateKeyPairSigner();
// get token account size
const tokenAccountLen = BigInt(getTokenSize([transferFeeConfigExtension]));
// Get minimum balance for rent exemption
const tokenAccountRent = await rpc
.getMinimumBalanceForRentExemption(tokenAccountLen)
.send();
// Instruction to create new account for the token account
// Invokes the system program
const createTokenAccountInstruction = getCreateAccountInstruction({
payer: authority,
newAccount: tokenAccount,
lamports: tokenAccountRent,
space: tokenAccountLen,
programAddress: TOKEN_2022_PROGRAM_ADDRESS
});
// Instruction to initialize the created token account
const initializeTokenAccountInstruction = getInitializeAccountInstruction({
account: tokenAccount.address,
mint: mint.address,
owner: authority.address
});
console.log("token account", tokenAccount.address); // ! debug
const instructions = [
createMintAccountInstruction,
initializeTransferFeeConfigInstruction,
initializeMintInstruction,
createTokenAccountInstruction,
initializeTokenAccountInstruction
];
// Create transaction message
const transactionMessage = pipe(
createTransactionMessage({ version: 0 }),
(tx) => setTransactionMessageFeePayerSigner(authority, tx),
(tx) => setTransactionMessageLifetimeUsingBlockhash(latestBlockhash, tx),
(tx) => appendTransactionMessageInstructions(instructions, tx)
);
// Sign transaction message with all required signers
const signedTransaction =
await signTransactionMessageWithSigners(transactionMessage);
// Send and confirm transaction
await sendAndConfirmTransactionFactory({ rpc, rpcSubscriptions })(
signedTransaction,
{ commitment: "confirmed", skipPreflight: true }
);
// Get transaction signature
const transactionSignature = getSignatureFromTransaction(signedTransaction);
console.log("Mint Address with Transfer Fees:", mint.address.toString());
console.log("Token Account:", tokenAccount.address.toString());
console.log("Transfer Fee: 1.5% (150 basis points)");
console.log("Maximum Fee: 1 token");
console.log("Withdraw Authority:", authority.address.toString());
console.log("Transaction Signature:", transactionSignature);
Console
Click to execute the code.

러스트

use anyhow::Result;
use solana_client::nonblocking::rpc_client::RpcClient;
use solana_sdk::{
commitment_config::CommitmentConfig,
signature::{Keypair, Signer},
system_instruction::create_account,
transaction::Transaction,
};
use spl_token_2022::{
ID as TOKEN_2022_PROGRAM_ID,
extension::{ExtensionType, transfer_fee::instruction::initialize_transfer_fee_config},
instruction::{initialize_account, initialize_mint},
state::{Account, Mint},
};
#[tokio::main]
async fn main() -> Result<()> {
// Create connection to local validator
let client = RpcClient::new_with_commitment(
String::from("http://localhost:8899"),
CommitmentConfig::confirmed(),
);
let latest_blockhash = client.get_latest_blockhash().await?;
// Generate a new keypair for the fee payer
let fee_payer = Keypair::new();
// Airdrop 5 SOL to fee payer
let airdrop_signature = client
.request_airdrop(&fee_payer.pubkey(), 5_000_000_000)
.await?;
client.confirm_transaction(&airdrop_signature).await?;
loop {
let confirmed = client.confirm_transaction(&airdrop_signature).await?;
if confirmed {
break;
}
}
// Generate keypair to use as address of mint
let mint = Keypair::new();
// Get mint account size with transfer fee extension enabled
let mint_space =
ExtensionType::try_calculate_account_len::<Mint>(&[ExtensionType::TransferFeeConfig])?;
let mint_rent = client
.get_minimum_balance_for_rent_exemption(mint_space)
.await?;
// Instruction to create new account for mint (token22)
let create_mint_account_instruction = create_account(
&fee_payer.pubkey(), // payer
&mint.pubkey(), // new account (mint)
mint_rent, // lamports
mint_space as u64, // space
&TOKEN_2022_PROGRAM_ID, // program id
);
// Instruction to initialize transfer fee config extension
let initialize_transfer_fee_config_instruction = initialize_transfer_fee_config(
&TOKEN_2022_PROGRAM_ID, // program_id
&mint.pubkey(), // mint
Some(&fee_payer.pubkey()), // transfer_fee_config_authority
Some(&fee_payer.pubkey()), // withdraw_withheld_authority
100, // transfer_fee_basis_points (1% = 100 basis points)
1_000_000, // maximum_fee (1 token with 6 decimals)
)?;
// Instruction to initialize mint account data
let initialize_mint_instruction = initialize_mint(
&TOKEN_2022_PROGRAM_ID, // program id
&mint.pubkey(), // mint
&fee_payer.pubkey(), // mint authority
Some(&fee_payer.pubkey()), // freeze authority
6, // decimals
)?;
// Generate keypair to use as address of token account
let token_account = Keypair::new();
// Get default token account size (in bytes),
let token_account_space =
ExtensionType::try_calculate_account_len::<Account>(&[ExtensionType::TransferFeeConfig])?;
let token_account_rent = client
.get_minimum_balance_for_rent_exemption(token_account_space)
.await?;
// Instruction to create new account for token account (token22)
let create_token_account_instruction = create_account(
&fee_payer.pubkey(), // payer
&token_account.pubkey(), // new account (token account)
token_account_rent, // rent
token_account_space as u64, // space
&TOKEN_2022_PROGRAM_ID, // program id
);
// initialize token account
let initialize_token_account = initialize_account(
&TOKEN_2022_PROGRAM_ID, // program_id
&token_account.pubkey(), // token account
&mint.pubkey(), // mint
&fee_payer.pubkey(), // authority
)?;
// Construct transaction with previous instructions
let transaction = Transaction::new_signed_with_payer(
&[
create_mint_account_instruction,
initialize_transfer_fee_config_instruction,
initialize_mint_instruction,
create_token_account_instruction,
initialize_token_account,
],
Some(&fee_payer.pubkey()),
&[&fee_payer, &mint, &token_account],
latest_blockhash,
);
// Send and confirm transaction
let transaction_signature = client.send_and_confirm_transaction(&transaction).await?;
println!("Mint Address with Transfer Fees: {}", mint.pubkey());
println!("Token Account Address: {}", token_account.pubkey());
println!("Transfer Fee: 1% (100 basis points)");
println!("Maximum Fee: 1 token");
println!("Withdraw Authority: {}", fee_payer.pubkey());
println!("\nSuccessfully enabled transfer fees on mint");
println!("Transaction Signature: {}", transaction_signature);
Ok(())
}
Console
Click to execute the code.

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