libtorrent

Libtorrent 2.0 switched exclusively to mmaped read/writes for torrent downloads, which resulted in various performance and especially memory consumption issues on ALL platforms. For some reason Windows handled increased memory consumption the least gracefully. Many people continued to use v1.2 which use regular files. V2.1 ended up using pread/pwrite nowz it's fine now. The issue continued for 3 years more or less. https://github.com/arvidn/libtorrent/issues/6667

been waiting for this for a while https://github.com/transmission/transmission/issues/47 https://github.com/arvidn/libtorrent/issues/7283

It's not impossible, it's just hard to be better than libtorrent, otherwise a new client only makes sense as an exercise. Arvid Norberg is hardly a "beginner developer", yet look how hard it is to make a performant implementation of uTP: https://github.com/arvidn/libtorrent/issues/3542

> NAT-PMP https://github.com/arvidn/libtorrent/blob/c31d90b59ffb3910b6... >PCP seems like vaporware

Back in 2022 libtorrent implemented memory mapped IO as part of v2 [1]. Unfortunately, it didn't go so well. Memory usage went through the sky, leading to performance degradation and crashing [2]. The issue is still open in the project to this day, and many programs have stuck with the v1.2 library instead. It looks like they are headed to a multi-threaded pread implementation now [3] and someone has created a patch to tweak the current mmap fallback that uses pread to perform better in the meantime [4]. [1] - https://www.libtorrent.org/upgrade_to_2.0-ref.html [2] - https://github.com/arvidn/libtorrent/issues/6667 [3] - https://github.com/arvidn/libtorrent/pull/7013 [4] - https://github.com/qbittorrent/qBittorrent/pull/21300

Many! https://webtorrent.io/faq Notable ones include Libtorrent[1], Peertube[2], and their own Webtorrent Desktop[3]. 1. https://github.com/arvidn/libtorrent/issues/223 2. https://peertube-viewer.com/posts/2021-02-20-peertube-viewer... 3. https://webtorrent.io/desktop/

Country is normally determined by doing a reverse DNS lookup, and then looking at the country code in the domain name. It's not very accurate, but you can do it for free without relying on any third party service or database. Here is the libtorrent code that does it for every peer: https://github.com/arvidn/libtorrent/blob/8786d17e59c90aee2c...

Seems like that libtorrent support for webtorrent would be helpful for that. That was done recently in https://github.com/arvidn/libtorrent/pull/4123, merged to master, but hasn't been released yet. Per the master changelog, that should be soon, I guess... https://github.com/arvidn/libtorrent/blob/master/ChangeLog

Not quite there yet. Latest release of libtorrent was 1.2.9, seems it's scheduled for "some branch" after 2.0 (https://github.com/arvidn/libtorrent/pull/4123#issuecomment-...). Add in some time for clients to actually start using it as well, which is not guaranteed either. The DHT remains split for now.

WebTorrent is part of libtorrent now, so should be part of all torrent clients based on it, e.g. qBittorrent: https://github.com/arvidn/libtorrent/pull/4123

There are two other WebTorrent implementations (possibly more that I don't know about!) * https://github.com/anacrolix/torrent (Golang) * https://github.com/arvidn/libtorrent (C++) An implementation in Rust would be amazing, but there is a quite a bit of work to make that happen in pure Rust though! If you want to use FFI/unsafe code it is totally do-able :)

WebTorrent is a version of the BitTorrent protocol modified to work over WebRTC so that it can work in a browser. Someone is actively working with the maintainer of libtorrent (popular implementation of BitTorrent) to get support for it into the library: https://github.com/arvidn/libtorrent/pull/4123

https://github.com/arvidn/libtorrent/pull/4123 <- Once this PR is ready and merged we'll probably see a boatload of streaming websites streaming (web)torrents. This might just be the next era of pirate streaming coming up, considering the ease of distribution when you don't have to do it yourself. For those unaware, libtorrent powers a lot of torrent clients.