@marinade.finance/kamino-sdk/src/whirpools-client/instructions/initializeFeeTier.ts

Kamino SDK

import { TransactionInstruction, PublicKey, AccountMeta } from '@solana/web3.js'; // eslint-disable-line @typescript-eslint/no-unused-vars
import BN from 'bn.js'; // eslint-disable-line @typescript-eslint/no-unused-vars
import * as borsh from '@project-serum/borsh'; // eslint-disable-line @typescript-eslint/no-unused-vars
import * as types from '../types'; // eslint-disable-line @typescript-eslint/no-unused-vars
import { WHIRLPOOL_PROGRAM_ID } from '../programId';

export interface InitializeFeeTierArgs {
  tickSpacing: number;
  defaultFeeRate: number;
}

export interface InitializeFeeTierAccounts {
  config: PublicKey;
  feeTier: PublicKey;
  funder: PublicKey;
  feeAuthority: PublicKey;
  systemProgram: PublicKey;
}

export const layout = borsh.struct([borsh.u16('tickSpacing'), borsh.u16('defaultFeeRate')]);

export function initializeFeeTier(args: InitializeFeeTierArgs, accounts: InitializeFeeTierAccounts) {
  const keys: Array<AccountMeta> = [
    { pubkey: accounts.config, isSigner: false, isWritable: false },
    { pubkey: accounts.feeTier, isSigner: false, isWritable: true },
    { pubkey: accounts.funder, isSigner: true, isWritable: true },
    { pubkey: accounts.feeAuthority, isSigner: true, isWritable: false },
    { pubkey: accounts.systemProgram, isSigner: false, isWritable: false },
  ];
  const identifier = Buffer.from([183, 74, 156, 160, 112, 2, 42, 30]);
  const buffer = Buffer.alloc(1000);
  const len = layout.encode(
    {
      tickSpacing: args.tickSpacing,
      defaultFeeRate: args.defaultFeeRate,
    },
    buffer
  );
  const data = Buffer.concat([identifier, buffer]).slice(0, 8 + len);
  const ix = new TransactionInstruction({ keys, programId: WHIRLPOOL_PROGRAM_ID, data });
  return ix;
}