Would like to add Demo multithreaded download feature 希望加入Demo多线程下载功能

[cmx15157571386]

What problem is this solving

In China, downloading Valve Demo is very slow using the built-in download function
在中国，使用内置的下载功能下载Valve Demo速度非常慢

Proposed solution

Use multithreading when downloading demos; or add a switch in the options to let users choose whether to enable multithreading to download demos or not
在下载Demo时使用多线程下载技术；或者在选项中添加开关让用户自主选择是否开启多线程下载Demo

Describe alternatives you've considered

Manually copy the Demo download address into the Multi-threaded Downloader in the Game Data interface and use the decompression software to extract the Demo file to the specified directory and analyze it using the CSDM
在游戏数据界面中手动复制Demo下载地址到多线程下载器中，并使用解压缩软件将Demo文件解压到指定目录，并使用CSDM分析

[WangChuDi]

Maybe try to use TUN mode in your proxy software to download?

[Xiguinilster]

Excuse me, this is a completely unrelated question.
Where can I download the demos for the Asian scene that aren't on HTV, and how? Thanks.

[cmx15157571386]

Maybe try to use TUN mode in your proxy software to download?

It can be solved by using multithreaded downloads, there's no need to waste traffic
使用多线程下载就能解决，没必要浪费流量

[cmx15157571386]

Excuse me, this is a completely unrelated question. Where can I download the demos for the Asian scene that aren't on HTV, and how? Thanks.

The in-game download function is also single-threaded, but the DEMO files are stored on Valve's servers, so it's possible that the downloads are very fast where you guys are concerned, while China's network environment is worse, which causes the single-threaded downloads to become very slow. I can also provide a copy of the address of the DEMO file generated from the server in Hong Kong, China
http://replay403.valve.net/730/003759487843882238065_1857488906.dem.bz2

游戏内的下载功能也是单线程的，但DEMO文件就是存储在Valve的服务器上的，可能你们那里下载非常快，而中国的网络环境比较差，导致单线程的下载速度变得非常慢。我这里也可以提供一份来自中国香港服务器所生成的DEMO文件的地址
http://replay403.valve.net/730/003759487843882238065_1857488906.dem.bz2

[WangChuDi]

Excuse me, this is a completely unrelated question. Where can I download the demos for the Asian scene that aren't on HTV, and how? Thanks.

The in-game download function is also single-threaded, but the DEMO files are stored on Valve's servers, so it's possible that the downloads are very fast where you guys are concerned, while China's network environment is worse, which causes the single-threaded downloads to become very slow. I can also provide a copy of the address of the DEMO file generated from the server in Hong Kong, China http://replay403.valve.net/730/003759487843882238065_1857488906.dem.bz2

游戏内的下载功能也是单线程的，但DEMO文件就是存储在Valve的服务器上的，可能你们那里下载非常快，而中国的网络环境比较差，导致单线程的下载速度变得非常慢。我这里也可以提供一份来自中国香港服务器所生成的DEMO文件的地址 http://replay403.valve.net/730/003759487843882238065_1857488906.dem.bz2

What broadband operator are you using? On my side, Shenzhen Telecom Unicom can download demos at normal speed (10+mb/s) for single-threaded downloads. In addition, the demo download servers of perfectworld are all run by Perfect World on Alibaba Cloud servers, for example: http://replay397.csgo.com.cn/730/003759026877927260305_0015488589.dem.bz2
Do you often play worldwide CS official game? So it will be downloaded from valve's server?

你用的是什么宽带运营商？我这边深圳电信联通单线程下载都能正常速度下载demo（10+mb/s）。另外我这边国服官匹的demo下载服务器都是由完美世界运行在国内阿里云服务器上的，例如：http://replay397.csgo.com.cn/730/003759026877927260305_0015488589.dem.bz2
你是经常打国际服官匹么？所以会从valve的服务器下载？

[cmx15157571386]

Excuse me, this is a completely unrelated question. Where can I download the demos for the Asian scene that aren't on HTV, and how? Thanks.

The in-game download function is also single-threaded, but the DEMO files are stored on Valve's servers, so it's possible that the downloads are very fast where you guys are concerned, while China's network environment is worse, which causes the single-threaded downloads to become very slow. I can also provide a copy of the address of the DEMO file generated from the server in Hong Kong, China http://replay403.valve.net/730/003759487843882238065_1857488906.dem.bz2
游戏内的下载功能也是单线程的，但DEMO文件就是存储在Valve的服务器上的，可能你们那里下载非常快，而中国的网络环境比较差，导致单线程的下载速度变得非常慢。我这里也可以提供一份来自中国香港服务器所生成的DEMO文件的地址 http://replay403.valve.net/730/003759487843882238065_1857488906.dem.bz2

What broadband operator are you using? On my side, Shenzhen Telecom Unicom can download demos at normal speed (10+mb/s) for single-threaded downloads. In addition, the demo download servers of perfectworld are all run by Perfect World on Alibaba Cloud servers, for example: http://replay397.csgo.com.cn/730/003759026877927260305_0015488589.dem.bz2 Do you often play worldwide CS official game? So it will be downloaded from valve's server?

你用的是什么宽带运营商？我这边深圳电信联通单线程下载都能正常速度下载demo（10+mb/s）。另外我这边国服官匹的demo下载服务器都是由完美世界运行在国内阿里云服务器上的，例如：http://replay397.csgo.com.cn/730/003759026877927260305_0015488589.dem.bz2 你是经常打国际服官匹么？所以会从valve的服务器下载？

感谢您能够使用中文回答我，我的宽带是绍兴电信老163骨干网AS4134（动态公网ipv4地址）的，下载Valve的Demo速度确实够呛（单线程），完美世界的我确实打不过，所以我喜欢玩国际服，完美的Demo文件即使是单线程我也能够拉满带宽下载

Thank you for being able to answer me in Chinese, my broadband is Shaoxing China Telecom old 163 backbone AS4134 (dynamic public ipv4 address), download Valve's Demo speed is really bad enough (single-threaded), the perfect world of the players I really can not beat, so I like to play the international service, the perfect world of the Demo file even if it is a single-threaded I am also able to download full-speed!

[cmx15157571386]

这可能是个大问题，而出这个问题的是Valve，而不是CSDemoManager，我猜测它只是使用了游戏内置的下载功能，而这个功能就是单线程下载的，而不是解析出Demo的实际下载地址并在CSDemoManager内下载

This could be a big problem, and it's Valve that has this problem, not the CSDemoManager, which I'm guessing is just using the game's built-in download function, which is a single-threaded download, rather than parsing out the actual download address of the demo and downloading it within the CSDemoManager

[WangChuDi]

实际上CSDM是直接使用undici库中的request进行的下载。使用curl -I -H "Range: bytes=0-100" http://replay403.valve.net/730/003759487843882238065_1857488906.dem.bz2 发现demo下载服务器是支持分块下载的，或许能通过分块来实现多线程下载？

In fact, CSDM is downloaded directly using the request in the undici library. Use'curl-I-H"range:bytes=0-100" http://replay403.valve.net/730/003759487843882238065_1857488906.dem.bz2 `I found that the demo download server supports block download. Maybe multithreaded download can be achieved through block download?

The following is a multithreaded download of the ai-generated code using the request in the undici library：

import { request } from 'undici';
import { createWriteStream } from 'fs';

async function downloadFileInChunks(url: string, chunkSize: number): Promise<void> {
  const { headers } = await request(url, { method: 'HEAD' });
  const totalSize = parseInt(headers['content-length'] || '0', 10);
  const chunks: Promise<Buffer>[] = [];

  for (let i = 0; i < totalSize; i += chunkSize) {
    const start = i;
    const end = Math.min(i + chunkSize - 1, totalSize - 1);
    chunks.push(downloadChunk(url, start, end));
  }

  const chunkBuffers = await Promise.all(chunks);
  const fileBuffer = Buffer.concat(chunkBuffers);

  // Write the file to disk
  const fileStream = createWriteStream('downloadedfile.zip');
  fileStream.write(fileBuffer);
  fileStream.end();
}

async function downloadChunk(url: string, start: number, end: number): Promise<Buffer> {
  const { body } = await request(url, {
    headers: {
      'Range': `bytes=${start}-${end}`
    }
  });
  const buffer = await body.arrayBuffer();
  return Buffer.from(buffer);
}

// Example usage
const url = 'http://replay403.valve.net/730/003759487843882238065_1857488906.dem.bz2';
const chunkSize = 1024 * 1024 * 1; // 1MB chunks
downloadFileInChunks(url, chunkSize).then(() => {
  console.log('Download complete');
}).catch(error => {
  console.error('Download error:', error);
});

[Xiguinilster]

I'm wondering what website I can use to download demos of professional Asian teams that aren't HLTV, and where they're all the same, considering I'm from Argentina.

[WangChuDi]

I'm wondering what website I can use to download demos of professional Asian teams that aren't HLTV, and where they're all the same, considering I'm from Argentina.

Maybe it can be downloaded through the competition platform? For example, Perfect World and 5EPLAY. In 5EPLAY APP, you can find some tournament in China.

[cmx15157571386]

实际上CSDM是直接使用undici库中的request进行的下载。使用curl -I -H "Range: bytes=0-100" http://replay403.valve.net/730/003759487843882238065_1857488906.dem.bz2 发现demo下载服务器是支持分块下载的，或许能通过分块来实现多线程下载？

In fact, CSDM is downloaded directly using the request in the undici library. Use'curl-I-H"range:bytes=0-100" http://replay403.valve.net/730/003759487843882238065_1857488906.dem.bz2 `I found that the demo download server supports block download. Maybe multithreaded download can be achieved through block download?

The following is a multithreaded download of the ai-generated code using the request in the undici library：

import { request } from 'undici';
import { createWriteStream } from 'fs';

async function downloadFileInChunks(url: string, chunkSize: number): Promise<void> {
  const { headers } = await request(url, { method: 'HEAD' });
  const totalSize = parseInt(headers['content-length'] || '0', 10);
  const chunks: Promise<Buffer>[] = [];

  for (let i = 0; i < totalSize; i += chunkSize) {
    const start = i;
    const end = Math.min(i + chunkSize - 1, totalSize - 1);
    chunks.push(downloadChunk(url, start, end));
  }

  const chunkBuffers = await Promise.all(chunks);
  const fileBuffer = Buffer.concat(chunkBuffers);

  // Write the file to disk
  const fileStream = createWriteStream('downloadedfile.zip');
  fileStream.write(fileBuffer);
  fileStream.end();
}

async function downloadChunk(url: string, start: number, end: number): Promise<Buffer> {
  const { body } = await request(url, {
    headers: {
      'Range': `bytes=${start}-${end}`
    }
  });
  const buffer = await body.arrayBuffer();
  return Buffer.from(buffer);
}

// Example usage
const url = 'http://replay403.valve.net/730/003759487843882238065_1857488906.dem.bz2';
const chunkSize = 1024 * 1024 * 1; // 1MB chunks
downloadFileInChunks(url, chunkSize).then(() => {
  console.log('Download complete');
}).catch(error => {
  console.error('Download error:', error);
});

确实，Valve和完美世界都是支持多线程下载的，可能大佬开发的时候也没想到会有这种需求，使用就默认使用了单线程下载，我不是专业的开发者，但愿大佬们能够解决这个问题吧

Indeed, Valve and Perfect World both support multi-threaded downloads, perhaps the developers did not expect to have such a need when they developed it, and the use of the default use of single-threaded downloads, I'm not a professional developer, but hopefully the professional developers can solve this problem!