在 Solana 链上搭建应用#

在本指南中，我们将通过欧易 DEX 提供一个用例来进行 Solana 代币兑换。这个过程包括:

设置你的环境
获取 toTokenAddress 的代币账户地址
获取兑换路径
反序列化并签名
执行交易

1. 设置你的环境#

导入必要的 Node.js 库并设置你的环境变量以及定义辅助函数和组装参数 Node.js 环境设置

在以上基础上需要导入以下库

const bs58 = require('bs58');
  const solanaWeb3 = require('@solana/web3.js');
  const {Connection} = require("@solana/web3.js");
  npm i bs58
  npm i @solana/web3.js

2. 获取兑换路径及 callData#

提示

Solana 的 NativeTokenAddress 为 11111111111111111111111111111111

通过 /swap 接口，获取详细兑换路径及 callData 数据，以 Solana 链 SOL 到 wSOL 兑换为例。

curl --location --request GET 'https://www.okx.com/api/v5/dex/aggregator/swap?amount=1000&chainId=501&fromTokenAddress=11111111111111111111111111111111&toTokenAddress=So11111111111111111111111111111111111111112&userWalletAddress=3cUbuUEJkcgtzGxvsukksNzmgqaUK9jwFS5pqxxxxxxx&slippage=0.05' \

3. 反序列化并签名#

提示

此处 callData 是从 /swap 接口中获取

async function signTransaction(callData, privateKey) {

    // decode
    const transaction = bs58.decode(callData)

    let tx
    // There are two types of callData, one is the old version and the other is the new version.
    try {
        tx = solanaWeb3.Transaction.from(transaction)
    } catch (error) {
        tx = solanaWeb3.VersionedTransaction.deserialize(transaction)
    }

    // Replace the latest block hash
    const recentBlockHash = await connection.getLatestBlockhash();


    if (tx instanceof solanaWeb3.VersionedTransaction) {
        tx.message.recentBlockhash = recentBlockHash.blockhash;
    } else {
        tx.recentBlockhash = recentBlockHash.blockhash
    }



    let feePayer = solanaWeb3.Keypair.fromSecretKey(bs58.decode(privateKey))
    // sign
    if (tx instanceof solanaWeb3.VersionedTransaction) {
    // v0 callData
        tx.sign([feePayer])
      } else {
    // legacy callData
        tx.partialSign(feePayer)
      }
    console.log(tx)


}

// 'xxxxxxx' means your privateKey
signTransaction(callData,'xxxxxxx')

4. 执行交易#

const txId =  await connection.sendRawTransaction(tx.serialize());

  console.log('txId:', txId)

  // Verify whether it has been broadcast on the chain.
  await connection.confirmTransaction(txId);
  console.log(`https://solscan.io/tx/${txId}`);