從 CLI 執行交換

import { Connection, Keypair, PublicKey } from "@solana/web3.js";
import { Raydium, TxVersion, CurveCalculator } from "@raydium-io/raydium-sdk-v2";
import BN from "bn.js";
import fs from "node:fs";

// ── Config from env ──────────────────────────────────────────────
const RPC_URL    = process.env.RPC_URL    ?? "https://api.mainnet-beta.solana.com";
const KEYPAIR    = process.env.KEYPAIR    ?? `${process.env.HOME}/.config/solana/id.json`;
const POOL_ID    = process.env.POOL_ID;     // required, base58
const INPUT_MINT = process.env.INPUT_MINT;  // required, base58
const AMOUNT_RAW = process.env.AMOUNT_RAW;  // required, integer in raw units (e.g. 1_000_000_000 for 1 SOL)

if (!POOL_ID || !INPUT_MINT || !AMOUNT_RAW) {
  console.error("Set POOL_ID, INPUT_MINT, AMOUNT_RAW env vars.");
  process.exit(1);
}

// ── Setup ────────────────────────────────────────────────────────
const connection = new Connection(RPC_URL, "confirmed");
const owner = Keypair.fromSecretKey(
  new Uint8Array(JSON.parse(fs.readFileSync(KEYPAIR, "utf8"))),
);
const raydium = await Raydium.load({
  owner,
  connection,
  cluster: "mainnet",
  disableFeatureCheck: true,
  blockhashCommitment: "finalized",
});

// ── Load pool ────────────────────────────────────────────────────
const { poolInfo, poolKeys, rpcData } =
  await raydium.cpmm.getPoolInfoFromRpc(new PublicKey(POOL_ID));

const baseIn = poolInfo.mintA.address === INPUT_MINT;

// ── Quote ────────────────────────────────────────────────────────
const inputAmount = new BN(AMOUNT_RAW);
const swapResult  = CurveCalculator.swap(
  inputAmount,
  baseIn ? rpcData.baseReserve : rpcData.quoteReserve,
  baseIn ? rpcData.quoteReserve : rpcData.baseReserve,
  rpcData.configInfo.tradeFeeRate,
);

console.log(`Quote: ${inputAmount.toString()} -> ${swapResult.destinationAmountSwapped.toString()}`);
console.log(`Fee:   ${swapResult.tradeFee.toString()}`);

// ── Build and execute ────────────────────────────────────────────
const { execute } = await raydium.cpmm.swap({
  poolInfo,
  poolKeys,
  inputAmount,
  swapResult,
  slippage: 0.005, // 0.5%
  baseIn,
  txVersion: TxVersion.V0,
  computeBudgetConfig: {
    units: 250_000,
    microLamports: 50_000,
  },
});

const { txId } = await execute({ sendAndConfirm: true });
console.log(`Swap landed: https://solscan.io/tx/${txId}`);