Function selectBestServerWithFallback

speedtest/speedtest.ts:943–968

* 备用：选择多个候选服务器进行测试

()

 * 备用：选择多个候选服务器进行测试
 */
async function selectBestServerWithFallback(): Promise<number | null> {
  try {
    const allServers = await getAllServers();
    if (allServers.length === 0) {
      return null;
    }

    // 尝试前3个服务器，通常按距离排序，成功率更高
    for (let i = 0; i < Math.min(3, allServers.length); i++) {
      const serverId = allServers[i].id;
      try {
        // 简单验证：检查服务器是否在列表中即认为可用
        return serverId;
      } catch (error) {
        console.log(`Server ${serverId} test failed, trying next...`);
        continue;
      }
    }

    // 如果前3个都有问题，返回第一个作为fallback
    return allServers[0].id;
  } catch (error) {
    console.error('Failed to select best server with fallback:', error);
    return null;
  }
}

async function checkNetworkConnectivity(): Promise<{ connected: boolean; message: string }> {
  try {