README.md

   1 # torrent
   2
   3 [![PkgGoDev](https://pkg.go.dev/badge/github.com/anacrolix/torrent)](https://pkg.go.dev/github.com/anacrolix/torrent)
   4
   5 This repository implements BitTorrent-related packages and command-line utilities in Go. The emphasis is on use as a library from other projects. It's been used 24/7 in production by downstream services since late 2014. The implementation was specifically created to explore Go's concurrency capabilities, and to include the ability to stream data directly from the BitTorrent network. To this end it [supports seeking, readaheads and other features](https://godoc.org/github.com/anacrolix/torrent#Reader) exposing torrents and their files with the various Go idiomatic `io` package interfaces. This is also demonstrated through [torrentfs](#torrentfs).
   6
   7 There is [support for protocol encryption, DHT, PEX, uTP, and various extensions](https://godoc.org/github.com/anacrolix/torrent). There are [several data storage backends provided](https://godoc.org/github.com/anacrolix/torrent/storage): blob, file, bolt, mmap, and sqlite, to name a few. You can [write your own](https://godoc.org/github.com/anacrolix/torrent/storage#ClientImpl) to store data for example on S3, or in a database.
   8
   9 Some noteworthy package dependencies that can be used for other purposes include:
  10
  11  * [go-libutp](https://github.com/anacrolix/go-libutp)
  12  * [dht](https://github.com/anacrolix/dht)
  13  * [bencode](https://godoc.org/github.com/anacrolix/torrent/bencode)
  14  * [tracker](https://godoc.org/github.com/anacrolix/torrent/tracker)
  15
  16 ## Installation
  17
  18 Install the library package with `go get github.com/anacrolix/torrent`, or the provided cmds with `go install github.com/anacrolix/torrent/cmd/...@latest`.
  19
  20 ## Library examples
  21
  22 There are some small [examples](https://godoc.org/github.com/anacrolix/torrent#pkg-examples) in the package documentation.
  23
  24 ## Mentions
  25
  26  * [@anacrolix](https://github.com/anacrolix) and this repo are in [Console 32](https://console.substack.com/p/console-32).
  27
  28 ### Downstream projects
  29
  30 There are several web-frontends and Android clients among the known public projects:
  31
  32  * [Torrent.Express](https://torrent.express/)
  33  * [Confluence](https://github.com/anacrolix/confluence)
  34  * [Trickl](https://github.com/arranlomas/Trickl)
  35  * [Elementum](http://elementum.surge.sh/) (up to version 0.0.71)
  36  * [goTorrent](https://github.com/deranjer/goTorrent)
  37  * [Go Peerflix](https://github.com/Sioro-Neoku/go-peerflix)
  38  * [Simple Torrent](https://github.com/boypt/simple-torrent) (fork of [Cloud Torrent](https://github.com/jpillora/cloud-torrent), unmaintained)
  39  * [Android Torrent Client](https://gitlab.com/axet/android-torrent-client)
  40  * [libtorrent](https://gitlab.com/axet/libtorrent)
  41  * [Remote-Torrent](https://github.com/BruceWangNo1/remote-torrent)
  42  * [ANT-Downloader](https://github.com/anatasluo/ant)
  43  * [Go-PeersToHTTP](https://github.com/WinPooh32/peerstohttp)
  44  * [CortexFoundation/torrentfs](https://github.com/CortexFoundation/torrentfs): P2P file system of cortex full node
  45  * [TorrServ](https://github.com/YouROK/TorrServer): Torrent streaming server over http.
  46
  47 ## Help
  48
  49 Communication about the project is primarily through [Discussions](https://github.com/anacrolix/torrent/discussions) and the [issue tracker](https://github.com/anacrolix/torrent/issues).
  50
  51 ## Command packages
  52
  53 Here I'll describe what some of the packages in `./cmd` do. Install them with `go get github.com/anacrolix/torrent/cmd/...`.
  54
  55 ### torrent
  56
  57 Downloads torrents from the command-line.
  58
  59     $ torrent download 'magnet:?xt=urn:btih:KRWPCX3SJUM4IMM4YF5RPHL6ANPYTQPU'
  60     ... lots of jibba jabber ...
  61     downloading "ubuntu-14.04.2-desktop-amd64.iso": 1.0 GB/1.0 GB, 1989/1992 pieces completed (1 partial)
  62     2015/04/01 02:08:20 main.go:137: downloaded ALL the torrents
  63     $ md5sum ubuntu-14.04.2-desktop-amd64.iso
  64     1b305d585b1918f297164add46784116  ubuntu-14.04.2-desktop-amd64.iso
  65     $ echo such amaze
  66     wow
  67
  68 ### torrentfs
  69
  70 torrentfs mounts a FUSE filesystem at `-mountDir`. The contents are the torrents described by the torrent files and magnet links at `-metainfoDir`. Data for read requests is fetched only as required from the torrent network, and stored at `-downloadDir`.
  71
  72     $ mkdir mnt torrents
  73     $ torrentfs -mountDir=mnt -metainfoDir=torrents &
  74     $ cd torrents
  75     $ wget http://releases.ubuntu.com/14.04.2/ubuntu-14.04.2-desktop-amd64.iso.torrent
  76     $ cd ..
  77     $ ls mnt
  78     ubuntu-14.04.2-desktop-amd64.iso
  79     $ pv mnt/ubuntu-14.04.2-desktop-amd64.iso | md5sum
  80     996MB 0:04:40 [3.55MB/s] [========================================>] 100%
  81     1b305d585b1918f297164add46784116  -
  82
  83 ### torrent-magnet
  84
  85 Creates a magnet link from a torrent file. Note the extracted trackers, display name, and info hash.
  86
  87     $ torrent-magnet < torrents/ubuntu-14.04.2-desktop-amd64.iso.torrent
  88     magnet:?xt=urn:btih:546cf15f724d19c4319cc17b179d7e035f89c1f4&dn=ubuntu-14.04.2-desktop-amd64.iso&tr=http%3A%2F%2Ftorrent.ubuntu.com%3A6969%2Fannounce&tr=http%3A%2F%2Fipv6.torrent.ubuntu.com%3A6969%2Fannounce