// Typically, configure this after initializing the key.
Cos.initCustomerDNSFetch(async (domain: string) => {
  const dnsMap: Map<string, string[]> = new Map([
    ['service.cos.myqcloud.com', ["106.119.174.56", "106.119.174.57", "106.119.174.55"]],
    ['cos.ap-guangzhou.myqcloud.com', ["27.155.119.179", "27.155.119.180", "27.155.119.166", "27.155.119.181"]],
  ]);
  let ips = null;
  dnsMap.forEach((value, key) => {
    // Using endsWith for filtering allows matching more subdomains. For example, 000000-1253960454.cos.ap-guangzhou.myqcloud.com can also be matched to cos.ap-guangzhou.myqcloud.com.
    if (domain.endsWith(key)) {
      console.log(`HOST: ${key}, IPS: ${JSON.stringify(value)}`);
      ips = value;
    }
  });
  return ips;
});

const dnsArray = [
  {domain:'service.cos.myqcloud.com', ips: ["106.119.174.56", "106.119.174.57", "106.119.174.55"]},
  {domain:'000000-1253960454.cos.ap-guangzhou.myqcloud.com', ips: ["27.155.119.179", "27.155.119.180", "27.155.119.166", "27.155.119.181"]},
  {domain:'cos.ap-guangzhou.myqcloud.com', ips: ["27.155.119.179", "27.155.119.180", "27.155.119.166", "27.155.119.181"]},
];
// Typically, configure this after initializing the key.
Cos.initCustomerDNS(dnsArray);