Popularity
7.3
Growing
Activity
1.1
Growing
2,367
86
385

Description

A modern, reliable and customizable BitTorrent implementation in Java 8, built around Google Guice.

Programming language: Java
License: Apache License 2.0
Latest version: v1.11

Bt alternatives and similar libraries

Based on the "Distributed Applications" category.
Alternatively, view Bt alternatives based on common mentions on social networks and blogs.

  • Hystrix

    9.8 2.7 L2 Bt VS Hystrix
    Hystrix is a latency and fault tolerance library designed to isolate points of access to remote systems, services and 3rd party libraries, stop cascading failure and enable resilience in complex distributed systems where failure is inevitable.
  • Redisson

    9.7 9.9 L1 Bt VS Redisson
    Redisson - Easy Redis Java client with features of In-Memory Data Grid. Sync/Async/RxJava/Reactive API. Over 50 Redis based Java objects and services: Set, Multimap, SortedSet, Map, List, Queue, Deque, Semaphore, Lock, AtomicLong, Map Reduce, Bloom filter, Spring Cache, Tomcat, Scheduler, JCache API, Hibernate, RPC, local cache ...
  • Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
  • Apache ZooKeeper

    Apache ZooKeeper
  • Akka

    9.5 9.4 Bt VS Akka
    Build highly concurrent, distributed, and resilient message-driven applications on the JVM
  • Pinpoint

    9.5 9.7 L2 Bt VS Pinpoint
    APM, (Application Performance Management) tool for large-scale distributed systems.
  • Vert.x

    9.4 9.6 L1 Bt VS Vert.x
    Vert.x is a tool-kit for building reactive applications on the JVM
  • Zuul

    9.4 9.0 Bt VS Zuul
    Zuul is a gateway service that provides dynamic routing, monitoring, resiliency, security, and more.
  • Apache Storm

    Apache Storm
  • Hazelcast

    Hazelcast is a unified real-time data platform combining stream processing with a fast data store, allowing customers to act instantly on data-in-motion for real-time insights.
  • Ribbon

    Ribbon is a Inter Process Communication (remote procedure calls) library with built in software load balancers. The primary usage model involves REST calls with various serialization scheme support.
  • Quasar

    8.2 0.0 L1 Bt VS Quasar
    Fibers, Channels and Actors for the JVM
  • Lagom

    Reactive Microservices for the JVM
  • Atomix

    7.4 7.8 L4 Bt VS Atomix
    A Kubernetes toolkit for building distributed applications using cloud native principles
  • Orbit

    6.6 0.0 L5 Bt VS Orbit
    Orbit - Virtual actor framework for building distributed systems
  • JGroups

    6.5 9.3 L2 Bt VS JGroups
    The JGroups project
  • Hazelcast Jet

    Distributed Stream and Batch Processing
  • Copycat

    5.2 0.0 L4 Bt VS Copycat
    Fault-tolerant state machine replication framework.
  • ScaleCube

    Microservices library - scalecube-services is a high throughput, low latency reactive microservices library built to scale. it features: API-Gateways, service-discovery, service-load-balancing, the architecture supports plug-and-play service communication modules and features. built to provide performance and low-latency real-time stream-processing
  • Dropwizard Circuit Breaker

    A circuit breaker design pattern for dropwizard
  • kite

    1.7 0.0 Bt VS kite
    Lightweight service-based PubSub, RPC and public APIs in Java
  • Axon Framework

    Framework for creating CQRS applications.

Do you think we are missing an alternative of Bt or a related project?

Add another 'Distributed Applications' Library

README

Bt

A full-featured BitTorrent implementation in Java 8 peer exchange | magnet links | DHT | encryption | LSD | private trackers | extended protocol | partial downloads | port forwarding

Supported BEPs and extensions

Resources

  • HOME – website with documentation and tutorials
  • RELEASE NOTES – list of features, bugfixes and improments for each version
  • UPGRADE INSTRUCTIONS – version migration guide
  • FORUM – Google group for support and feedback
  • TROUBLESHOOTING - solutions for some common problems
  • LICENSE – licensed under Apache License 2.0

Runnable apps and demos

Media

Prerequisites

Currently, all peer connections are established via encryption negotation protocol (also called MSE handshake). If you're using Oracle JDK (pre 8u152), in order to be able to connect to peers you must install Java Cryptography Extension (JCE) Unlimited Strength Jurisdiction Policy. The reason for this requirement is that the MSE RC4 cipher uses 160 bit keys, while default Java installation allows at most 128 bit keys.

Usage

Most recent version available in Maven Central is 1.10.

Declare the following dependencies in your project’s pom.xml:

<dependency>
    <groupId>com.github.atomashpolskiy</groupId>
    <artifactId>bt-core</artifactId>
    <version>${bt-version}</version>
</dependency>
<dependency>
    <groupId>com.github.atomashpolskiy</groupId>
    <artifactId>bt-http-tracker-client</artifactId>
    <version>${bt-version}</version>
</dependency>
<dependency>
    <groupId>com.github.atomashpolskiy</groupId>
    <artifactId>bt-dht</artifactId>
    <version>${bt-version}</version>
</dependency>
<dependency>
    <groupId>com.github.atomashpolskiy</groupId>
    <artifactId>bt-upnp</artifactId>
    <version>${bt-version}</version>
</dependency>

Building from source

git clone https://github.com/atomashpolskiy/bt.git
cd bt
mvn clean install -DskipTests

Code sample

Download a torrent from a magnet link

// enable multithreaded verification of torrent data
Config config = new Config() {
    @Override
    public int getNumOfHashingThreads() {
        return Runtime.getRuntime().availableProcessors() * 2;
    }
};

// enable bootstrapping from public routers
Module dhtModule = new DHTModule(new DHTConfig() {
    @Override
    public boolean shouldUseRouterBootstrap() {
        return true;
    }
});

// get download directory
Path targetDirectory = Paths.get(System.getProperty("user.home"), "Downloads");

// create file system based backend for torrent data
Storage storage = new FileSystemStorage(targetDirectory);

// create client with a private runtime
BtClient client = Bt.client()
        .config(config)
        .storage(storage)
        .magnet("magnet:?xt=urn:btih:af0d9aa01a9ae123a73802cfa58ccaf355eb19f1")
        .autoLoadModules()
        .module(dhtModule)
        .stopWhenDownloaded()
        .build();

// launch
client.startAsync().join();

Create a torrent

Path torrentRoot = Paths.get("/home/torrents/mytorrent");
Path file1 = Paths.get("/home/torrents/mytorrent/file1.bin");
Path file2 = Paths.get("/home/torrents/mytorrent/file2.bin");
Path dirToAdd = Paths.get("/home/torrents/mytorrent/dir_with_files");
byte[] torrentBytes = new TorrentBuilder()
        .rootPath(torrentRoot)
        .addFiles(file1, file2, dirToAdd)
        .announce("http://example.com/announce")
        .build();
Files.write(Paths.get("/home/torrents/mytorrent.torrent"), torrentBytes);

What makes Bt stand out from the crowd

Flexibility

Being built around the Guice DI, Bt provides many options for tailoring the system for your specific needs. If something is a part of Bt, then it can be modified or substituted for your custom code.

Custom backends

Bt is shipped with a standard file-system based backend (i.e. you can download the torrent file to a storage device). However, the backend details are abstracted from the message-level code. This means that you can use your own backend by providing a storage unit implementation.

Protocol extensions

One notable customization scenario is extending the standard BitTorrent protocol with your own messages. BitTorrent's BEP-10 provides a native support for protocol extensions, and implementation of this standard is already included in Bt. Contribute your own Messages, byte manipulating MessageHandlers, message consumers and producers; supply any additional info in ExtendedHandshake.

Test infrastructure

To allow you test the changes that you've made to the core, Bt ships with a specialized framework for integration tests. Create an arbitrary-sized swarm of peers inside a simple JUnit test, set the number of seeders and leechers and start a real torrent session on your localhost. E.g. create one seeder and many leechers to stress test the network overhead; use a really large file and multiple peers to stress test your newest laptop's expensive SSD storage; or just launch the whole swarm in no-files mode and test your protocol extensions.

Parallel downloads

Bt has out-of-the-box support for multiple simultaneous torrent sessions with minimal system overhead.

Partial downloads

Bt has an API for selecting only a subset of torrent files to download. See the bt.TorrentClientBuilder.fileSelector(TorrentFileSelector) client builder method. File selection works for both .torrent file-based and magnet link downloads.

Java 8 CompletableFuture

Client API leverages the asynchronous java.util.concurrent.CompletableFuture to provide the most natural way for co-ordinating multiple torrent sessions. E.g. use CompletableFuture.allOf(client1.startAsync(...), client2.startAsync(...), ...).join(). Or create a more sophisticated processing pipeline.

And much more...

Troubleshooting

Can't connect to peers, everything else seems to work

If you're using an Oracle JDK, make sure that you have installed Java Cryptography Extension (JCE) Unlimited Strength Jurisdiction Policy.

Other BitTorrent clients can't connect to a Bt client / No incoming connections when seeding

a) If you're behind a firewall and/or a NAT (e.g. a router), make sure they are configured to allow incoming TCP and UDP connections on the ports used by Bt. Default Bt ports are 6891 and 49001 for BitTorrent and DHT respectively. NAT must additionally be configured to forward all incoming traffic on these ports to the host, that Bt is running on.

b) Many popular BitTorrent clients use UPnP and NAT-PMP to automatically configure port forwarding on NATs. Since 1.8 Bt does this as well, so make sure to include bt-upnp module in the list of dependencies.

There are exceptions in the build log (but the build completes successfully)

This is perfectly fine. Some of the tests verify that the exceptions are thrown in certain cases, hence the exception messages.

Can't run the CLI on Windows XP (java.io.IOException: Cannot run program "/bin/stty")

CLI GUI indeed does not work on Windows XP. Run in headless mode by using -H flag.

Can't connect to peers on Windows 7/8/10

There seem to be some issues with dual-stack networking in Windows JDK (e.g. see this question on SO), with Java trying to use IPv6 address, when it's not really available in the system. The simplest solution is to force Java to use IPv4 by setting java.net.preferIPv4Stack property to true.

Support and feedback

Any thoughts, ideas, criticism, etc. are welcome, as well as votes for new features and BEPs to be added. You have the following options to share your ideas, receive help or report bugs:

Donate


*Note that all licence references and agreements mentioned in the Bt README section above are relevant to that project's source code only.