Cerrar Mint

Cómo habilitar la extensión MintCloseAuthority

La MintCloseAuthority extensión permite que las cuentas mint sean cerradas y su rent sea recuperado. Esta extensión debe inicializarse cuando se crea el mint.

Solo la autoridad de cierre designada puede cerrar la cuenta mint. Similar a cómo las token account solo pueden cerrarse cuando el saldo de tokens es cero, las mint account con esta extensión solo pueden cerrarse cuando todo el suministro de tokens se ha reducido a cero.

Typescript

import {
airdropFactory,
appendTransactionMessageInstructions,
createSolanaRpc,
createSolanaRpcSubscriptions,
createTransactionMessage,
generateKeyPairSigner,
getSignatureFromTransaction,
lamports,
pipe,
sendAndConfirmTransactionFactory,
setTransactionMessageFeePayerSigner,
setTransactionMessageLifetimeUsingBlockhash,
signTransactionMessageWithSigners
} from "@solana/kit";
import { getCreateAccountInstruction } from "@solana-program/system";
import {
getInitializeMintInstruction,
getMintSize,
TOKEN_2022_PROGRAM_ADDRESS,
extension,
getInitializeMintCloseAuthorityInstruction,
getCloseAccountInstruction
} from "@solana-program/token-2022";
// 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, (will also act as the fee payer)
// and destination to receive recovered SOL after closing the mint
const authority = await generateKeyPairSigner();
const destination = 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 mint close authority extension.
const mintCloseAuthorityExtension = extension("MintCloseAuthority", {
closeAuthority: authority.address
});
// Get default mint account size (in bytes), with the close mint extension
const space = BigInt(getMintSize([mintCloseAuthorityExtension]));
// 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 createAccountInstruction = getCreateAccountInstruction({
payer: authority,
newAccount: mint,
lamports: rent,
space,
programAddress: TOKEN_2022_PROGRAM_ADDRESS
});
// Instruction to initialize the close mint authority extension
const initializeCloseMintInstruction =
getInitializeMintCloseAuthorityInstruction({
mint: mint.address,
closeAuthority: mintCloseAuthorityExtension.closeAuthority
});
// Instruction to initialize mint account data
// Invokes the token program
const initializeMintInstruction = getInitializeMintInstruction({
mint: mint.address,
decimals: 9,
mintAuthority: authority.address
});
const instructions = [
createAccountInstruction,
initializeCloseMintInstruction,
initializeMintInstruction
];
// 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:", mint.address.toString());
console.log("Transaction Signature:", transactionSignature);
// Get a fresh blockhash for the close mint extension instruction
const { value: latestBlockhash2 } = await rpc.getLatestBlockhash().send();
const closeMintInstruction = getCloseAccountInstruction({
account: mint.address,
destination: destination.address,
owner: authority
});
// Create transaction message for close mint extension
const closeMintMessage = pipe(
createTransactionMessage({ version: 0 }),
(tx) => setTransactionMessageFeePayerSigner(authority, tx),
(tx) => setTransactionMessageLifetimeUsingBlockhash(latestBlockhash2, tx),
(tx) => appendTransactionMessageInstructions([closeMintInstruction], tx)
);
// Sign transaction message with all required signers
const signedCloseMintTx =
await signTransactionMessageWithSigners(closeMintMessage);
// Send and confirm transaction
await sendAndConfirmTransactionFactory({ rpc, rpcSubscriptions })(
signedCloseMintTx,
{ commitment: "confirmed" }
);
// Get transaction signature
const closeMintTxSig = getSignatureFromTransaction(signedCloseMintTx);
console.log("\nDestination Address:", destination.address.toString());
console.log("Transaction Signature:", closeMintTxSig);
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_ID,
extension::ExtensionType,
instruction::{close_account, initialize_mint, initialize_mint_close_authority},
state::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();
// Generate a keypair for the destination
let destination = 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 default mint account size (in bytes),
let mint_space =
ExtensionType::try_calculate_account_len::<Mint>(&[ExtensionType::MintCloseAuthority])?;
// get the rent in lamports for the mint account
let mint_rent = client
.get_minimum_balance_for_rent_exemption(mint_space)
.await?;
// Instruction to create new account for mint (token program)
let create_account_instruction = create_account(
&fee_payer.pubkey(), // payer
&mint.pubkey(), // new account (mint)
mint_rent, // lamports
mint_space as u64, // space
&TOKEN_2022_ID, // program id
);
let initialize_close_mint_instruction = initialize_mint_close_authority(
&TOKEN_2022_ID, // token program
&mint.pubkey(), // mint
Some(&fee_payer.pubkey()), // close authority
)?;
// Instruction to initialize mint account data
let initialize_mint_instruction = initialize_mint(
&TOKEN_2022_ID, // token program
&mint.pubkey(), // mint
&fee_payer.pubkey(), // mint authority
Some(&fee_payer.pubkey()), // freeze authority
9, // decimals
)?;
// Create transaction and add instructions
let transaction = Transaction::new_signed_with_payer(
&[
create_account_instruction,
initialize_close_mint_instruction,
initialize_mint_instruction,
],
Some(&fee_payer.pubkey()),
&[&fee_payer, &mint],
latest_blockhash,
);
// Send and confirm transaction
let transaction_signature = client.send_and_confirm_transaction(&transaction).await?;
println!("Mint Address: {}", mint.pubkey());
println!("\nTransaction Signature: {}", transaction_signature);
// Get the latest blockhash for the close transaction
let latest_blockhash = client.get_latest_blockhash().await?;
let close_mint_instruction = close_account(
&TOKEN_2022_ID, // token program
&mint.pubkey(), // mint
&destination.pubkey(), // destination
&fee_payer.pubkey(), // authority
&[&fee_payer.pubkey()], // signer keys
)?;
// Create transaction for closing the mint account
let transaction = Transaction::new_signed_with_payer(
&[close_mint_instruction],
Some(&fee_payer.pubkey()),
&[&fee_payer],
latest_blockhash,
);
// Send and confirm transaction
let transaction_signature = client.send_and_confirm_transaction(&transaction).await?;
println!("\nDestination Address: {}", destination.pubkey());
println!("Transaction Signature: {}", transaction_signature);
Ok(())
}
Console
Click to execute the code.

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