Phí chuyển khoản

Cách triển khai TransferFeeExtension

TransferFeeExtension cho phép thu phí tự động trên mỗi giao dịch chuyển token. Phí tích lũy trong các token account của người nhận và có thể được rút bởi withdraw authority được thiết lập trên mint account.

Typescript

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.

Rust

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.

Is this page helpful?

Mục lục

Chỉnh sửa trang