@solana/spl-token
Version:
SPL Token Program JS API
55 lines • 3.32 kB
JavaScript
import { Keypair, sendAndConfirmTransaction, SystemProgram, Transaction } from '@solana/web3.js';
import { getSigners } from '../../actions/internal.js';
import { TOKEN_2022_PROGRAM_ID } from '../../constants.js';
import { createInitializeMintInstruction } from '../../instructions/initializeMint.js';
import { ExtensionType, getMintLen } from '../extensionType.js';
import { createInitializeInterestBearingMintInstruction, createUpdateRateInterestBearingMintInstruction, } from './instructions.js';
/**
* Initialize an interest bearing account on a mint
*
* @param connection Connection to use
* @param payer Payer of the transaction fees
* @param mintAuthority Account or multisig that will control minting
* @param freezeAuthority Optional account or multisig that can freeze token accounts
* @param rateAuthority The public key for the account that can update the rate
* @param rate The initial interest rate
* @param decimals Location of the decimal place
* @param keypair Optional keypair, defaulting to a new random one
* @param confirmOptions Options for confirming the transaction
* @param programId SPL Token program account
*
* @return Public key of the mint
*/
export async function createInterestBearingMint(connection, payer, mintAuthority, freezeAuthority, rateAuthority, rate, decimals, keypair = Keypair.generate(), confirmOptions, programId = TOKEN_2022_PROGRAM_ID) {
const mintLen = getMintLen([ExtensionType.InterestBearingConfig]);
const lamports = await connection.getMinimumBalanceForRentExemption(mintLen);
const transaction = new Transaction().add(SystemProgram.createAccount({
fromPubkey: payer.publicKey,
newAccountPubkey: keypair.publicKey,
space: mintLen,
lamports,
programId,
}), createInitializeInterestBearingMintInstruction(keypair.publicKey, rateAuthority, rate, programId), createInitializeMintInstruction(keypair.publicKey, decimals, mintAuthority, freezeAuthority, programId));
await sendAndConfirmTransaction(connection, transaction, [payer, keypair], confirmOptions);
return keypair.publicKey;
}
/**
* Update the interest rate of an interest bearing account
*
* @param connection Connection to use
* @param payer Payer of the transaction fees
* @param mint Public key of the mint
* @param rateAuthority The public key for the account that can update the rate
* @param rate The initial interest rate
* @param multiSigners Signing accounts if `owner` is a multisig
* @param confirmOptions Options for confirming the transaction
* @param programId SPL Token program account
*
* @return Signature of the confirmed transaction
*/
export async function updateRateInterestBearingMint(connection, payer, mint, rateAuthority, rate, multiSigners = [], confirmOptions, programId = TOKEN_2022_PROGRAM_ID) {
const [rateAuthorityPublicKey, signers] = getSigners(rateAuthority, multiSigners);
const transaction = new Transaction().add(createUpdateRateInterestBearingMintInstruction(mint, rateAuthorityPublicKey, rate, signers, programId));
return await sendAndConfirmTransaction(connection, transaction, [payer, rateAuthority, ...signers], confirmOptions);
}
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