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 exposing torrents and their files with the various Go idiomatic
io package interfaces. This is also demonstrated through torrentfs.
There is support for protocol encryption, DHT, PEX, uTP, and various extensions. There are several data storage backends provided: blob, file, bolt, mmap, and sqlite, to name a few. You can write your own to store data for example on S3, or in a database.
Some noteworthy package dependencies that can be used for other purposes include:
Install the library package with
go get github.com/anacrolix/torrent, or the provided cmds with
go get github.com/anacrolix/torrent/cmd/....
There are some small examples in the package documentation.
There are several web-frontends and Android clients among the known public projects:
- Elementum (up to version 0.0.71)
- Go Peerflix
- Simple Torrent (fork of Cloud Torrent, unmaintained)
- Android Torrent Client
- CortexFoundation/torrentfs: P2P file system of cortex full node
Here I'll describe what some of the packages in
Note that the
godo command which is invoked in the following examples builds and executes a Go import path, like
go run. It's easier to use this convention than to spell out the install/invoke cycle for every single example.
Downloads torrents from the command-line. This first example does not use
$ go get github.com/anacrolix/torrent/cmd/torrent # Now 'torrent' should be in $GOPATH/bin, which should be in $PATH. $ torrent download 'magnet:?xt=urn:btih:KRWPCX3SJUM4IMM4YF5RPHL6ANPYTQPU' ubuntu-14.04.2-desktop-amd64.iso [===================================================================>] 99% downloading (1.0 GB/1.0 GB) 2015/04/01 02:08:20 main.go:137: downloaded ALL the torrents $ md5sum ubuntu-14.04.2-desktop-amd64.iso 1b305d585b1918f297164add46784116 ubuntu-14.04.2-desktop-amd64.iso $ echo such amaze wow
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
$ mkdir mnt torrents $ godo github.com/anacrolix/torrent/cmd/torrentfs -mountDir=mnt -metainfoDir=torrents & $ cd torrents $ wget http://releases.ubuntu.com/14.04.2/ubuntu-14.04.2-desktop-amd64.iso.torrent $ cd .. $ ls mnt ubuntu-14.04.2-desktop-amd64.iso $ pv mnt/ubuntu-14.04.2-desktop-amd64.iso | md5sum 996MB 0:04:40 [3.55MB/s] [========================================>] 100% 1b305d585b1918f297164add46784116 -
Creates a magnet link from a torrent file. Note the extracted trackers, display name, and info hash.
$ godo github.com/anacrolix/torrent/cmd/torrent-magnet < ubuntu-14.04.2-desktop-amd64.iso.torrent 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