777 lines
22 KiB
JavaScript
777 lines
22 KiB
JavaScript
/**
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* @flow
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*/
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import assert from 'assert';
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import BN from 'bn.js';
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import * as BufferLayout from 'buffer-layout';
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import type {Connection, TransactionSignature} from '@solana/web3.js';
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import {
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Account,
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PublicKey,
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SystemProgram,
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Transaction,
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TransactionInstruction,
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} from '@solana/web3.js';
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import * as Layout from './layout';
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import {sendAndConfirmTransaction} from './util/send-and-confirm-transaction';
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import {loadAccount} from './util/account';
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/**
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* Some amount of tokens
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*/
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export class Numberu64 extends BN {
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/**
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* Convert to Buffer representation
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*/
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toBuffer(): typeof Buffer {
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const a = super.toArray().reverse();
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const b = Buffer.from(a);
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if (b.length === 8) {
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return b;
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}
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assert(b.length < 8, 'Numberu64 too large');
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const zeroPad = Buffer.alloc(8);
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b.copy(zeroPad);
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return zeroPad;
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}
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/**
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* Construct a Numberu64 from Buffer representation
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*/
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static fromBuffer(buffer: typeof Buffer): Numberu64 {
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assert(buffer.length === 8, `Invalid buffer length: ${buffer.length}`);
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return new BN(
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[...buffer]
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.reverse()
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.map(i => `00${i.toString(16)}`.slice(-2))
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.join(''),
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16,
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);
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}
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}
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/**
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* @private
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*/
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export const TokenSwapLayout: typeof BufferLayout.Structure = BufferLayout.struct(
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[
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BufferLayout.u8('isInitialized'),
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BufferLayout.u8('nonce'),
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Layout.publicKey('tokenProgramId'),
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Layout.publicKey('tokenAccountA'),
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Layout.publicKey('tokenAccountB'),
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Layout.publicKey('tokenPool'),
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Layout.publicKey('mintA'),
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Layout.publicKey('mintB'),
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Layout.publicKey('feeAccount'),
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BufferLayout.u8('curveType'),
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Layout.uint64('tradeFeeNumerator'),
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Layout.uint64('tradeFeeDenominator'),
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Layout.uint64('ownerTradeFeeNumerator'),
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Layout.uint64('ownerTradeFeeDenominator'),
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Layout.uint64('ownerWithdrawFeeNumerator'),
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Layout.uint64('ownerWithdrawFeeDenominator'),
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BufferLayout.blob(16, 'padding'),
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],
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);
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export const CurveType = Object.freeze({
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ConstantProduct: 0, // Constant product curve, Uniswap-style
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Flat: 1, // Flat curve, always 1:1 trades
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});
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/**
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* A program to exchange tokens against a pool of liquidity
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*/
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export class TokenSwap {
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/**
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* @private
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*/
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connection: Connection;
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/**
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* Program Identifier for the Swap program
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*/
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swapProgramId: PublicKey;
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/**
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* Program Identifier for the Token program
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*/
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tokenProgramId: PublicKey;
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/**
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* The public key identifying this swap program
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*/
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tokenSwap: PublicKey;
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/**
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* The public key for the liquidity pool token mint
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*/
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poolToken: PublicKey;
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/**
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* The public key for the fee account receiving trade and/or withdrawal fees
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*/
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feeAccount: PublicKey;
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/**
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* Authority
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*/
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authority: PublicKey;
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/**
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* The public key for the first token account of the trading pair
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*/
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tokenAccountA: PublicKey;
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/**
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* The public key for the second token account of the trading pair
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*/
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tokenAccountB: PublicKey;
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/**
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* The public key for the mint of the first token account of the trading pair
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*/
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mintA: PublicKey;
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/**
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* The public key for the mint of the second token account of the trading pair
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*/
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mintB: PublicKey;
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/**
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* Trading fee numerator
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*/
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tradeFeeNumerator: Numberu64;
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/**
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* Trading fee denominator
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*/
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tradeFeeDenominator: Numberu64;
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/**
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* Owner trading fee numerator
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*/
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ownerTradeFeeNumerator: Numberu64;
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/**
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* Owner trading fee denominator
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*/
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ownerTradeFeeDenominator: Numberu64;
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/**
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* Owner withdraw fee numerator
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*/
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ownerWithdrawFeeNumerator: Numberu64;
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/**
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* Owner withdraw fee denominator
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*/
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ownerWithdrawFeeDenominator: Numberu64;
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/**
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* CurveType, current options are:
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*/
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curveType: number;
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/**
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* Fee payer
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*/
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payer: Account;
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/**
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* Create a Token object attached to the specific token
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*
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* @param connection The connection to use
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* @param tokenSwap The token swap account
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* @param swapProgramId The program ID of the token-swap program
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* @param tokenProgramId The program ID of the token program
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* @param poolToken The pool token
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* @param authority The authority over the swap and accounts
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* @param tokenAccountA: The token swap's Token A account
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* @param tokenAccountB: The token swap's Token B account
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* @param payer Pays for the transaction
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*/
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constructor(
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connection: Connection,
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tokenSwap: PublicKey,
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swapProgramId: PublicKey,
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tokenProgramId: PublicKey,
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poolToken: PublicKey,
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feeAccount: PublicKey,
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authority: PublicKey,
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tokenAccountA: PublicKey,
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tokenAccountB: PublicKey,
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mintA: PublicKey,
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mintB: PublicKey,
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curveType: number,
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tradeFeeNumerator: Numberu64,
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tradeFeeDenominator: Numberu64,
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ownerTradeFeeNumerator: Numberu64,
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ownerTradeFeeDenominator: Numberu64,
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ownerWithdrawFeeNumerator: Numberu64,
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ownerWithdrawFeeDenominator: Numberu64,
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payer: Account,
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) {
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Object.assign(this, {
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connection,
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tokenSwap,
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swapProgramId,
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tokenProgramId,
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poolToken,
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feeAccount,
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authority,
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tokenAccountA,
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tokenAccountB,
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mintA,
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mintB,
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curveType,
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tradeFeeNumerator,
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tradeFeeDenominator,
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ownerTradeFeeNumerator,
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ownerTradeFeeDenominator,
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ownerWithdrawFeeNumerator,
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ownerWithdrawFeeDenominator,
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payer,
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});
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}
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/**
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* Get the minimum balance for the token swap account to be rent exempt
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*
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* @return Number of lamports required
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*/
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static async getMinBalanceRentForExemptTokenSwap(
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connection: Connection,
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): Promise<number> {
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return await connection.getMinimumBalanceForRentExemption(
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TokenSwapLayout.span,
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);
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}
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static createInitSwapInstruction(
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tokenSwapAccount: Account,
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authority: PublicKey,
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tokenAccountA: PublicKey,
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tokenAccountB: PublicKey,
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tokenPool: PublicKey,
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feeAccount: PublicKey,
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tokenAccountPool: PublicKey,
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tokenProgramId: PublicKey,
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swapProgramId: PublicKey,
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nonce: number,
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curveType: number,
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tradeFeeNumerator: number,
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tradeFeeDenominator: number,
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ownerTradeFeeNumerator: number,
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ownerTradeFeeDenominator: number,
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ownerWithdrawFeeNumerator: number,
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ownerWithdrawFeeDenominator: number,
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): TransactionInstruction {
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const keys = [
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{pubkey: tokenSwapAccount.publicKey, isSigner: false, isWritable: true},
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{pubkey: authority, isSigner: false, isWritable: false},
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{pubkey: tokenAccountA, isSigner: false, isWritable: false},
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{pubkey: tokenAccountB, isSigner: false, isWritable: false},
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{pubkey: tokenPool, isSigner: false, isWritable: true},
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{pubkey: feeAccount, isSigner: false, isWritable: false},
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{pubkey: tokenAccountPool, isSigner: false, isWritable: true},
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{pubkey: tokenProgramId, isSigner: false, isWritable: false},
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];
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const commandDataLayout = BufferLayout.struct([
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BufferLayout.u8('instruction'),
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BufferLayout.u8('nonce'),
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BufferLayout.u8('curveType'),
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BufferLayout.nu64('tradeFeeNumerator'),
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BufferLayout.nu64('tradeFeeDenominator'),
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BufferLayout.nu64('ownerTradeFeeNumerator'),
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BufferLayout.nu64('ownerTradeFeeDenominator'),
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BufferLayout.nu64('ownerWithdrawFeeNumerator'),
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BufferLayout.nu64('ownerWithdrawFeeDenominator'),
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BufferLayout.blob(16, 'padding'),
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]);
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let data = Buffer.alloc(1024);
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{
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const encodeLength = commandDataLayout.encode(
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{
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instruction: 0, // InitializeSwap instruction
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nonce,
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curveType,
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tradeFeeNumerator,
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tradeFeeDenominator,
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ownerTradeFeeNumerator,
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ownerTradeFeeDenominator,
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ownerWithdrawFeeNumerator,
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ownerWithdrawFeeDenominator,
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},
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data,
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);
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data = data.slice(0, encodeLength);
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}
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return new TransactionInstruction({
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keys,
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programId: swapProgramId,
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data,
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});
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}
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static async loadTokenSwap(
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connection: Connection,
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address: PublicKey,
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programId: PublicKey,
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payer: Account,
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): Promise<TokenSwap> {
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const data = await loadAccount(connection, address, programId);
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const tokenSwapData = TokenSwapLayout.decode(data);
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if (!tokenSwapData.isInitialized) {
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throw new Error(`Invalid token swap state`);
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}
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const [authority] = await PublicKey.findProgramAddress(
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[address.toBuffer()],
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programId,
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);
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const poolToken = new PublicKey(tokenSwapData.tokenPool);
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const feeAccount = new PublicKey(tokenSwapData.feeAccount);
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const tokenAccountA = new PublicKey(tokenSwapData.tokenAccountA);
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const tokenAccountB = new PublicKey(tokenSwapData.tokenAccountB);
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const mintA = new PublicKey(tokenSwapData.mintA);
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const mintB = new PublicKey(tokenSwapData.mintB);
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const tokenProgramId = new PublicKey(tokenSwapData.tokenProgramId);
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const tradeFeeNumerator = Numberu64.fromBuffer(
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tokenSwapData.tradeFeeNumerator,
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);
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const tradeFeeDenominator = Numberu64.fromBuffer(
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tokenSwapData.tradeFeeDenominator,
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);
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const ownerTradeFeeNumerator = Numberu64.fromBuffer(
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tokenSwapData.ownerTradeFeeNumerator,
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);
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const ownerTradeFeeDenominator = Numberu64.fromBuffer(
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tokenSwapData.ownerTradeFeeDenominator,
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);
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const ownerWithdrawFeeNumerator = Numberu64.fromBuffer(
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tokenSwapData.ownerWithdrawFeeNumerator,
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);
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const ownerWithdrawFeeDenominator = Numberu64.fromBuffer(
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tokenSwapData.ownerWithdrawFeeDenominator,
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);
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const curveType = tokenSwapData.curveType;
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return new TokenSwap(
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connection,
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address,
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programId,
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tokenProgramId,
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poolToken,
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feeAccount,
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authority,
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tokenAccountA,
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tokenAccountB,
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mintA,
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mintB,
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curveType,
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tradeFeeNumerator,
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tradeFeeDenominator,
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ownerTradeFeeNumerator,
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ownerTradeFeeDenominator,
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ownerWithdrawFeeNumerator,
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ownerWithdrawFeeDenominator,
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payer,
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);
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}
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/**
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* Create a new Token Swap
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*
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* @param connection The connection to use
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* @param payer Pays for the transaction
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* @param tokenSwapAccount The token swap account
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* @param authority The authority over the swap and accounts
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* @param nonce The nonce used to generate the authority
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* @param tokenAccountA: The token swap's Token A account
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* @param tokenAccountB: The token swap's Token B account
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* @param poolToken The pool token
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* @param tokenAccountPool The token swap's pool token account
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* @param tokenProgramId The program ID of the token program
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* @param swapProgramId The program ID of the token-swap program
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* @param feeNumerator Numerator of the fee ratio
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* @param feeDenominator Denominator of the fee ratio
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* @return Token object for the newly minted token, Public key of the account holding the total supply of new tokens
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*/
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static async createTokenSwap(
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connection: Connection,
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payer: Account,
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tokenSwapAccount: Account,
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authority: PublicKey,
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tokenAccountA: PublicKey,
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tokenAccountB: PublicKey,
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poolToken: PublicKey,
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mintA: PublicKey,
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mintB: PublicKey,
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feeAccount: PublicKey,
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tokenAccountPool: PublicKey,
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swapProgramId: PublicKey,
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tokenProgramId: PublicKey,
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nonce: number,
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curveType: number,
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tradeFeeNumerator: number,
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tradeFeeDenominator: number,
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ownerTradeFeeNumerator: number,
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ownerTradeFeeDenominator: number,
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ownerWithdrawFeeNumerator: number,
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ownerWithdrawFeeDenominator: number,
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): Promise<TokenSwap> {
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let transaction;
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const tokenSwap = new TokenSwap(
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connection,
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tokenSwapAccount.publicKey,
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swapProgramId,
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tokenProgramId,
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poolToken,
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feeAccount,
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authority,
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tokenAccountA,
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tokenAccountB,
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mintA,
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mintB,
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curveType,
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new Numberu64(tradeFeeNumerator),
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new Numberu64(tradeFeeDenominator),
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new Numberu64(ownerTradeFeeNumerator),
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new Numberu64(ownerTradeFeeDenominator),
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new Numberu64(ownerWithdrawFeeNumerator),
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new Numberu64(ownerWithdrawFeeDenominator),
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payer,
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);
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// Allocate memory for the account
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const balanceNeeded = await TokenSwap.getMinBalanceRentForExemptTokenSwap(
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connection,
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);
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transaction = new Transaction();
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transaction.add(
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SystemProgram.createAccount({
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fromPubkey: payer.publicKey,
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newAccountPubkey: tokenSwapAccount.publicKey,
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lamports: balanceNeeded,
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space: TokenSwapLayout.span,
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programId: swapProgramId,
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}),
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);
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const instruction = TokenSwap.createInitSwapInstruction(
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tokenSwapAccount,
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authority,
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tokenAccountA,
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tokenAccountB,
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poolToken,
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feeAccount,
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tokenAccountPool,
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tokenProgramId,
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swapProgramId,
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nonce,
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curveType,
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tradeFeeNumerator,
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tradeFeeDenominator,
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ownerTradeFeeNumerator,
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ownerTradeFeeDenominator,
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ownerWithdrawFeeNumerator,
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ownerWithdrawFeeDenominator,
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);
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transaction.add(instruction);
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await sendAndConfirmTransaction(
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'createAccount and InitializeSwap',
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connection,
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transaction,
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payer,
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tokenSwapAccount,
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);
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return tokenSwap;
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}
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/**
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* Swap token A for token B
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*
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* @param userSource User's source token account
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* @param poolSource Pool's source token account
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* @param poolDestination Pool's destination token account
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* @param userDestination User's destination token account
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* @param amountIn Amount to transfer from source account
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* @param minimumAmountOut Minimum amount of tokens the user will receive
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*/
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async swap(
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userSource: PublicKey,
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poolSource: PublicKey,
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poolDestination: PublicKey,
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userDestination: PublicKey,
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amountIn: number | Numberu64,
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minimumAmountOut: number | Numberu64,
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): Promise<TransactionSignature> {
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return await sendAndConfirmTransaction(
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'swap',
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this.connection,
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new Transaction().add(
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TokenSwap.swapInstruction(
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this.tokenSwap,
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this.authority,
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userSource,
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poolSource,
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poolDestination,
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userDestination,
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this.poolToken,
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this.feeAccount,
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this.swapProgramId,
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this.tokenProgramId,
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amountIn,
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minimumAmountOut,
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),
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),
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this.payer,
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);
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}
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static swapInstruction(
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tokenSwap: PublicKey,
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authority: PublicKey,
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userSource: PublicKey,
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poolSource: PublicKey,
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poolDestination: PublicKey,
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userDestination: PublicKey,
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poolMint: PublicKey,
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feeAccount: PublicKey,
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swapProgramId: PublicKey,
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tokenProgramId: PublicKey,
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amountIn: number | Numberu64,
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minimumAmountOut: number | Numberu64,
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): TransactionInstruction {
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const dataLayout = BufferLayout.struct([
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BufferLayout.u8('instruction'),
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Layout.uint64('amountIn'),
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Layout.uint64('minimumAmountOut'),
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]);
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const data = Buffer.alloc(dataLayout.span);
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dataLayout.encode(
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{
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instruction: 1, // Swap instruction
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amountIn: new Numberu64(amountIn).toBuffer(),
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minimumAmountOut: new Numberu64(minimumAmountOut).toBuffer(),
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},
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data,
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);
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const keys = [
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{pubkey: tokenSwap, isSigner: false, isWritable: false},
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{pubkey: authority, isSigner: false, isWritable: false},
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{pubkey: userSource, isSigner: false, isWritable: true},
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{pubkey: poolSource, isSigner: false, isWritable: true},
|
|
{pubkey: poolDestination, isSigner: false, isWritable: true},
|
|
{pubkey: userDestination, isSigner: false, isWritable: true},
|
|
{pubkey: poolMint, isSigner: false, isWritable: true},
|
|
{pubkey: feeAccount, isSigner: false, isWritable: true},
|
|
{pubkey: tokenProgramId, isSigner: false, isWritable: false},
|
|
];
|
|
return new TransactionInstruction({
|
|
keys,
|
|
programId: swapProgramId,
|
|
data,
|
|
});
|
|
}
|
|
|
|
/**
|
|
* Deposit tokens into the pool
|
|
* @param userAccountA User account for token A
|
|
* @param userAccountB User account for token B
|
|
* @param poolAccount User account for pool token
|
|
* @param poolTokenAmount Amount of pool tokens to mint
|
|
* @param maximumTokenA The maximum amount of token A to deposit
|
|
* @param maximumTokenB The maximum amount of token B to deposit
|
|
*/
|
|
async deposit(
|
|
userAccountA: PublicKey,
|
|
userAccountB: PublicKey,
|
|
poolAccount: PublicKey,
|
|
poolTokenAmount: number | Numberu64,
|
|
maximumTokenA: number | Numberu64,
|
|
maximumTokenB: number | Numberu64,
|
|
): Promise<TransactionSignature> {
|
|
return await sendAndConfirmTransaction(
|
|
'deposit',
|
|
this.connection,
|
|
new Transaction().add(
|
|
TokenSwap.depositInstruction(
|
|
this.tokenSwap,
|
|
this.authority,
|
|
userAccountA,
|
|
userAccountB,
|
|
this.tokenAccountA,
|
|
this.tokenAccountB,
|
|
this.poolToken,
|
|
poolAccount,
|
|
this.swapProgramId,
|
|
this.tokenProgramId,
|
|
poolTokenAmount,
|
|
maximumTokenA,
|
|
maximumTokenB,
|
|
),
|
|
),
|
|
this.payer,
|
|
);
|
|
}
|
|
|
|
static depositInstruction(
|
|
tokenSwap: PublicKey,
|
|
authority: PublicKey,
|
|
sourceA: PublicKey,
|
|
sourceB: PublicKey,
|
|
intoA: PublicKey,
|
|
intoB: PublicKey,
|
|
poolToken: PublicKey,
|
|
poolAccount: PublicKey,
|
|
swapProgramId: PublicKey,
|
|
tokenProgramId: PublicKey,
|
|
poolTokenAmount: number | Numberu64,
|
|
maximumTokenA: number | Numberu64,
|
|
maximumTokenB: number | Numberu64,
|
|
): TransactionInstruction {
|
|
const dataLayout = BufferLayout.struct([
|
|
BufferLayout.u8('instruction'),
|
|
Layout.uint64('poolTokenAmount'),
|
|
Layout.uint64('maximumTokenA'),
|
|
Layout.uint64('maximumTokenB'),
|
|
]);
|
|
|
|
const data = Buffer.alloc(dataLayout.span);
|
|
dataLayout.encode(
|
|
{
|
|
instruction: 2, // Deposit instruction
|
|
poolTokenAmount: new Numberu64(poolTokenAmount).toBuffer(),
|
|
maximumTokenA: new Numberu64(maximumTokenA).toBuffer(),
|
|
maximumTokenB: new Numberu64(maximumTokenB).toBuffer(),
|
|
},
|
|
data,
|
|
);
|
|
|
|
const keys = [
|
|
{pubkey: tokenSwap, isSigner: false, isWritable: false},
|
|
{pubkey: authority, isSigner: false, isWritable: false},
|
|
{pubkey: sourceA, isSigner: false, isWritable: true},
|
|
{pubkey: sourceB, isSigner: false, isWritable: true},
|
|
{pubkey: intoA, isSigner: false, isWritable: true},
|
|
{pubkey: intoB, isSigner: false, isWritable: true},
|
|
{pubkey: poolToken, isSigner: false, isWritable: true},
|
|
{pubkey: poolAccount, isSigner: false, isWritable: true},
|
|
{pubkey: tokenProgramId, isSigner: false, isWritable: false},
|
|
];
|
|
return new TransactionInstruction({
|
|
keys,
|
|
programId: swapProgramId,
|
|
data,
|
|
});
|
|
}
|
|
|
|
/**
|
|
* Withdraw tokens from the pool
|
|
*
|
|
* @param userAccountA User account for token A
|
|
* @param userAccountB User account for token B
|
|
* @param poolAccount User account for pool token
|
|
* @param poolTokenAmount Amount of pool tokens to burn
|
|
* @param minimumTokenA The minimum amount of token A to withdraw
|
|
* @param minimumTokenB The minimum amount of token B to withdraw
|
|
*/
|
|
async withdraw(
|
|
userAccountA: PublicKey,
|
|
userAccountB: PublicKey,
|
|
poolAccount: PublicKey,
|
|
poolTokenAmount: number | Numberu64,
|
|
minimumTokenA: number | Numberu64,
|
|
minimumTokenB: number | Numberu64,
|
|
): Promise<TransactionSignature> {
|
|
return await sendAndConfirmTransaction(
|
|
'withdraw',
|
|
this.connection,
|
|
new Transaction().add(
|
|
TokenSwap.withdrawInstruction(
|
|
this.tokenSwap,
|
|
this.authority,
|
|
this.poolToken,
|
|
this.feeAccount,
|
|
poolAccount,
|
|
this.tokenAccountA,
|
|
this.tokenAccountB,
|
|
userAccountA,
|
|
userAccountB,
|
|
this.swapProgramId,
|
|
this.tokenProgramId,
|
|
poolTokenAmount,
|
|
minimumTokenA,
|
|
minimumTokenB,
|
|
),
|
|
),
|
|
this.payer,
|
|
);
|
|
}
|
|
|
|
static withdrawInstruction(
|
|
tokenSwap: PublicKey,
|
|
authority: PublicKey,
|
|
poolMint: PublicKey,
|
|
feeAccount: PublicKey,
|
|
sourcePoolAccount: PublicKey,
|
|
fromA: PublicKey,
|
|
fromB: PublicKey,
|
|
userAccountA: PublicKey,
|
|
userAccountB: PublicKey,
|
|
swapProgramId: PublicKey,
|
|
tokenProgramId: PublicKey,
|
|
poolTokenAmount: number | Numberu64,
|
|
minimumTokenA: number | Numberu64,
|
|
minimumTokenB: number | Numberu64,
|
|
): TransactionInstruction {
|
|
const dataLayout = BufferLayout.struct([
|
|
BufferLayout.u8('instruction'),
|
|
Layout.uint64('poolTokenAmount'),
|
|
Layout.uint64('minimumTokenA'),
|
|
Layout.uint64('minimumTokenB'),
|
|
]);
|
|
|
|
const data = Buffer.alloc(dataLayout.span);
|
|
dataLayout.encode(
|
|
{
|
|
instruction: 3, // Withdraw instruction
|
|
poolTokenAmount: new Numberu64(poolTokenAmount).toBuffer(),
|
|
minimumTokenA: new Numberu64(minimumTokenA).toBuffer(),
|
|
minimumTokenB: new Numberu64(minimumTokenB).toBuffer(),
|
|
},
|
|
data,
|
|
);
|
|
|
|
const keys = [
|
|
{pubkey: tokenSwap, isSigner: false, isWritable: false},
|
|
{pubkey: authority, isSigner: false, isWritable: false},
|
|
{pubkey: poolMint, isSigner: false, isWritable: true},
|
|
{pubkey: sourcePoolAccount, isSigner: false, isWritable: true},
|
|
{pubkey: fromA, isSigner: false, isWritable: true},
|
|
{pubkey: fromB, isSigner: false, isWritable: true},
|
|
{pubkey: userAccountA, isSigner: false, isWritable: true},
|
|
{pubkey: userAccountB, isSigner: false, isWritable: true},
|
|
{pubkey: feeAccount, isSigner: false, isWritable: true},
|
|
{pubkey: tokenProgramId, isSigner: false, isWritable: false},
|
|
];
|
|
return new TransactionInstruction({
|
|
keys,
|
|
programId: swapProgramId,
|
|
data,
|
|
});
|
|
}
|
|
}
|