torrent/README.md

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# torrent
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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 a downstream, private service since late 2014.
There is support for protocol encryption, [DHT](https://github.com/anacrolix/dht), PEX, [uTP](https://github.com/anacrolix/utp), and various extensions. See the package documentation for a more complete list. There are several data storage backends provided: blob, file, and mmap, and you can write your own, such as to store data on S3, or in a database. You can use the provided binaries in `./cmd`, or use package `torrent` as a library for your own applications.
Many of the sub-packages can be used for other purposes: [bencode](https://godoc.org/github.com/anacrolix/torrent/bencode), and [tracker](https://godoc.org/github.com/anacrolix/torrent/tracker), in particular.
## Installation
Install the library package with `go get github.com/anacrolix/torrent`, or the provided cmds with `go get github.com/anacrolix/torrent/cmd/...`.
## Library example
There is a small example in the [package documentation](https://godoc.org/github.com/anacrolix/torrent).
## Other public projects using torrent
* [Go Peerflix](https://github.com/Sioro-Neoku/go-peerflix)
* [Cloud Torrent](https://github.com/jpillora/cloud-torrent)
* [Android Torrent Client](https://gitlab.com/axet/android-torrent-client)
* [Android libtorrent](https://gitlab.com/axet/libtorrent)
* [Trickl - Torrent Client](https://play.google.com/store/apps/details?id=com.shwifty.tex)
* [Confluence](https://github.com/anacrolix/confluence)
* [Remote-Torrent](https://github.com/BruceWangNo1/remote-torrent)
* [Trickl Android Torrent Client](https://github.com/arranlomas/Trickl)
## Commands
Here I'll describe what some of the provided commands in `./cmd` do.
Note that the [`godo`](https://github.com/anacrolix/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.
### torrent
Downloads torrents from the command-line. This first example does not use `godo`.
$ go get github.com/anacrolix/torrent/cmd/torrent
# Now 'torrent' should be in $GOPATH/bin, which should be in $PATH.
$ torrent '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
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`.
$ 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 -
### torrent-magnet
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