@solana/spl-token
Version:
SPL Token Program JS API
69 lines • 3.27 kB
JavaScript
import { s16, struct, u8 } from '@solana/buffer-layout';
import { publicKey } from '@solana/buffer-layout-utils';
import { TransactionInstruction } from '@solana/web3.js';
import { TOKEN_2022_PROGRAM_ID } from '../../constants.js';
import { addSigners } from '../../instructions/internal.js';
import { TokenInstruction } from '../../instructions/types.js';
export var InterestBearingMintInstruction;
(function (InterestBearingMintInstruction) {
InterestBearingMintInstruction[InterestBearingMintInstruction["Initialize"] = 0] = "Initialize";
InterestBearingMintInstruction[InterestBearingMintInstruction["UpdateRate"] = 1] = "UpdateRate";
})(InterestBearingMintInstruction || (InterestBearingMintInstruction = {}));
export const interestBearingMintInitializeInstructionData = struct([
u8('instruction'),
u8('interestBearingMintInstruction'),
// TODO: Make this an optional public key
publicKey('rateAuthority'),
s16('rate'),
]);
export const interestBearingMintUpdateRateInstructionData = struct([
u8('instruction'),
u8('interestBearingMintInstruction'),
s16('rate'),
]);
/**
* Construct an InitializeInterestBearingMint instruction
*
* @param mint Mint to initialize
* @param rateAuthority The public key for the account that can update the rate
* @param rate The initial interest rate
* @param programId SPL Token program account
*
* @return Instruction to add to a transaction
*/
export function createInitializeInterestBearingMintInstruction(mint, rateAuthority, rate, programId = TOKEN_2022_PROGRAM_ID) {
const keys = [{ pubkey: mint, isSigner: false, isWritable: true }];
const data = Buffer.alloc(interestBearingMintInitializeInstructionData.span);
interestBearingMintInitializeInstructionData.encode({
instruction: TokenInstruction.InterestBearingMintExtension,
interestBearingMintInstruction: InterestBearingMintInstruction.Initialize,
rateAuthority,
rate,
}, data);
return new TransactionInstruction({ keys, programId, data });
}
/**
* Construct an UpdateRateInterestBearingMint instruction
*
* @param mint Mint to initialize
* @param rateAuthority The public key for the account that can update the rate
* @param rate The updated interest rate
* @param multiSigners Signing accounts if `rateAuthority` is a multisig
* @param programId SPL Token program account
*
* @return Instruction to add to a transaction
*/
export function createUpdateRateInterestBearingMintInstruction(mint, rateAuthority, rate, multiSigners = [], programId = TOKEN_2022_PROGRAM_ID) {
const keys = addSigners([
{ pubkey: mint, isSigner: false, isWritable: true },
{ pubkey: rateAuthority, isSigner: !multiSigners.length, isWritable: false },
], rateAuthority, multiSigners);
const data = Buffer.alloc(interestBearingMintUpdateRateInstructionData.span);
interestBearingMintUpdateRateInstructionData.encode({
instruction: TokenInstruction.InterestBearingMintExtension,
interestBearingMintInstruction: InterestBearingMintInstruction.UpdateRate,
rate,
}, data);
return new TransactionInstruction({ keys, programId, data });
}
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