Documentation SolanaTokens sur SolanaExtensions

Jetons porteurs d'intérêts

Comment activer l'InterestBearingExtension

L' InterestBearingMintExtension vous permet de définir un taux d'intérêt directement sur un mint account. L'intérêt se capitalise en continu en fonction de l'horodatage du réseau, mais le solde réel des jetons stocké dans chaque token account reste inchangé. La valeur totale (solde de jetons plus les intérêts accumulés) n'est qu'un calcul. Aucun nouveau jeton n'est créé avec cette extension.

Typescript

import { getCreateAccountInstruction } from "@solana-program/system";

import {

  extension,

  getInitializeAccountInstruction,

  getInitializeMintInstruction,

  getInitializeInterestBearingMintInstruction,

  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();



// Define the interest bearing config extension

const interestRate = {

  rate: 500 // 5.00% annualized interest (in basis points)

};



// config for interest bearing extension

const interestBearingMintExtension = extension("InterestBearingConfig", {

  rateAuthority: authority.address,

  initializationTimestamp: BigInt(Math.floor(new Date().getTime() / 1000)),

  lastUpdateTimestamp: BigInt(Math.floor(new Date().getTime() / 1000)),

  preUpdateAverageRate: interestRate.rate,

  currentRate: interestRate.rate

});



// Get mint account size with interest bearing extension

const space = BigInt(getMintSize([interestBearingMintExtension]));



// 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 interest bearing config extension

const initializeInterestBearingConfigInstruction =

  getInitializeInterestBearingMintInstruction({

    mint: mint.address,

    rateAuthority: authority.address,

    rate: interestRate.rate // in basis points

  });



// 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 (with extension awareness)

const tokenAccountLen = BigInt(getTokenSize());



// 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,

  initializeInterestBearingConfigInstruction,

  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 Interest Bearing Extension:",

  mint.address.toString()

);

console.log("Token Account:", tokenAccount.address.toString());

console.log("Interest Rate: 5% APY (500 basis points)");

console.log("Rate Authority:", authority.address.toString());

console.log("Transaction Signature:", transactionSignature);
Console
Click to execute the code.

Rust

Rust
use anyhow::Result;

use solana_client::nonblocking::rpc_client::RpcClient;

use solana_commitment_config::CommitmentConfig;

use solana_sdk::{

    signature::{Keypair, Signer},

    transaction::Transaction,

};

use solana_system_interface::instruction::create_account;

use spl_token_2022_interface::{

    extension::{

        interest_bearing_mint::{

            instruction::initialize as initialize_interest_bearing_instruction,

            InterestBearingConfig,

        },

        BaseStateWithExtensions, ExtensionType, StateWithExtensions,

    },

    instruction::initialize_mint,

    state::Mint,

    ID as TOKEN_2022_PROGRAM_ID,

};



#[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?;



    loop {

        let confirmed = client.confirm_transaction(&airdrop_signature).await?;

        if confirmed {

            break;

        }

    }



    // Generate keypair to use as address of mint

    let mint = Keypair::new();



    // Calculate mint account size with interest bearing extension

    let mint_space =

        ExtensionType::try_calculate_account_len::<Mint>(&[ExtensionType::InterestBearingConfig])?;



    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 interest bearing extension (5% APY)

    let initialize_interest_bearing_instruction = initialize_interest_bearing_instruction(

        &TOKEN_2022_PROGRAM_ID,

        &mint.pubkey(),

        Some(fee_payer.pubkey()), // rate authority

        500,                      // interest rate (basis points) = 5%

    )?;



    // 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

        9,                         // decimals

    )?;



    // Construct transaction with interest bearing mint extension

    let transaction = Transaction::new_signed_with_payer(

        &[

            create_mint_account_instruction,

            initialize_interest_bearing_instruction,

            initialize_mint_instruction,

        ],

        Some(&fee_payer.pubkey()),

        &[&fee_payer, &mint],

        latest_blockhash,

    );



    // Send and confirm transaction

    client.send_and_confirm_transaction(&transaction).await?;



    println!("Mint Address: {}", mint.pubkey());

    // Fetch mint account

    let mint_account = client.get_account(&mint.pubkey()).await?;

    // Deserialize the mint account with extensions

    let mint_state = StateWithExtensions::<Mint>::unpack(&mint_account.data)?;



    // Get all extension types enabled on this mint

    let mint_extension_types = mint_state.get_extension_types()?;

    println!("\nMint extensions enabled: {:?}", mint_extension_types);



    // Deserialize the InterestBearingConfig extension data

    let interest_bearing_config = mint_state.get_extension::<InterestBearingConfig>()?;

    println!("\n{:#?}", interest_bearing_config);



    Ok(())

}
Console
Click to execute the code.

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