Fabric Gateway SDK:如何检查通道是否存在？

const { Gateway, Wallets } = require('fabric-network');
const fs = require('fs');
const path = require('path');

async function checkChannelExist() {
  try {
    // 加载网络配置文件和身份证书
    const ccpPath = path.resolve(__dirname, 'connection.json');
    const ccpJSON = fs.readFileSync(ccpPath, 'utf8');
    const ccp = JSON.parse(ccpJSON);

    const walletPath = path.resolve(__dirname, 'wallet');
    const wallet = await Wallets.newFileSystemWallet(walletPath);

    // 创建一个新的Gateway实例
    const gateway = new Gateway();

    // 连接到Fabric网络
    await gateway.connect(ccp, {
      wallet,
      identity: 'user1',
      discovery: { enabled: true, asLocalhost: true },
    });

    // 获取网络中的通道
    const network = await gateway.getNetwork('mychannel');

    // 检查通道是否存在
    const isExist = await network.isChannelExist('mychannel');
    console.log(`Channel exists: ${isExist}`);

    // 断开与Fabric网络的连接
    await gateway.disconnect();
  } catch (error) {
    console.error(`Failed to check channel existence: ${error}`);
    process.exit(1);
  }
}

checkChannelExist();