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Programming language: Go
License: MIT License
Latest version: v1.4.7

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README

rain

BitTorrent client and library in Go. Running in production at put.io.

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Features

Screenshot

Rain Screenshot

Installing

If you are on MacOS you can install from brew:

brew install cenkalti/rain/rain

Otherwise, get the latest binary from releases page.

Usage as torrent client

Rain is distributed as single binary file. The main use case is running rain server command and operating the server with rain client <subcommand> commands. Server consists of a BitTorrent client and a RPC server. rain client is used to give commands to the server. There is also rain client console command which opens up a text based UI that you can view and manage the torrents on the server. Run rain help to see other commands.

Usage as library

// Create a session
ses, _ := torrent.NewSession(torrent.DefaultConfig)

// Add magnet link
tor, _ := ses.AddURI(magnetLink, nil)

// Watch the progress
for range time.Tick(time.Second) {
    s := tor.Stats()
    log.Printf("Status: %s, Downloaded: %d, Peers: %d", s.Status.String(), s.Bytes.Completed, s.Peers.Total)
}

More complete example can be found under handleDownload function at main.go file.

See package documentation for complete API.

Configuration

All values have sensible defaults, so you can run Rain with an empty config but if you want to customize it's behavior, you can pass a YAML config with -config flag. Config keys must be in lowercase. See the description of values in here: config.go

Difference from other clients

Rain is the main BitTorrent client used at put.io. It is designed to handle hundreds of torrents while using low system resources. The main difference from other clients is that Rain uses a separate peer port for each torrent. This allows Rain to download same torrent for multiple accounts in same private tracker and keep reporting their ratio correctly.

Missing features