@marinade.finance/kamino-sdk/src/whirpools-client/instructions/decreaseLiquidity.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 DecreaseLiquidityArgs {
  liquidityAmount: BN;
  tokenMinA: BN;
  tokenMinB: BN;
}

export interface DecreaseLiquidityAccounts {
  whirlpool: PublicKey;
  tokenProgram: PublicKey;
  positionAuthority: PublicKey;
  position: PublicKey;
  positionTokenAccount: PublicKey;
  tokenOwnerAccountA: PublicKey;
  tokenOwnerAccountB: PublicKey;
  tokenVaultA: PublicKey;
  tokenVaultB: PublicKey;
  tickArrayLower: PublicKey;
  tickArrayUpper: PublicKey;
}

export const layout = borsh.struct([borsh.u128('liquidityAmount'), borsh.u64('tokenMinA'), borsh.u64('tokenMinB')]);

export function decreaseLiquidity(args: DecreaseLiquidityArgs, accounts: DecreaseLiquidityAccounts) {
  const keys: Array<AccountMeta> = [
    { pubkey: accounts.whirlpool, isSigner: false, isWritable: true },
    { pubkey: accounts.tokenProgram, isSigner: false, isWritable: false },
    { pubkey: accounts.positionAuthority, isSigner: true, isWritable: false },
    { pubkey: accounts.position, isSigner: false, isWritable: true },
    {
      pubkey: accounts.positionTokenAccount,
      isSigner: false,
      isWritable: false,
    },
    { pubkey: accounts.tokenOwnerAccountA, isSigner: false, isWritable: true },
    { pubkey: accounts.tokenOwnerAccountB, isSigner: false, isWritable: true },
    { pubkey: accounts.tokenVaultA, isSigner: false, isWritable: true },
    { pubkey: accounts.tokenVaultB, isSigner: false, isWritable: true },
    { pubkey: accounts.tickArrayLower, isSigner: false, isWritable: true },
    { pubkey: accounts.tickArrayUpper, isSigner: false, isWritable: true },
  ];
  const identifier = Buffer.from([160, 38, 208, 111, 104, 91, 44, 1]);
  const buffer = Buffer.alloc(1000);
  const len = layout.encode(
    {
      liquidityAmount: args.liquidityAmount,
      tokenMinA: args.tokenMinA,
      tokenMinB: args.tokenMinB,
    },
    buffer
  );
  const data = Buffer.concat([identifier, buffer]).slice(0, 8 + len);
  const ix = new TransactionInstruction({ keys, programId: WHIRLPOOL_PROGRAM_ID, data });
  return ix;
}