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opendht

  • Clone with SSH
  • Clone with HTTPS

  • OpenDHT

    A lightweight C++17 Distributed Hash Table implementation.

    OpenDHT provides an easy to use distributed in-memory data store. Every node in the network can read and write values to the store. Values are distributed over the network, with redundancy.

    • Lightweight and scalable, designed for large networks and small devices
    • High resilience to network disruption
    • Public key cryptography layer providing optional data signature and encryption (using GnuTLS)
    • IPv4 and IPv6 support
    • Clean and powerful C++17 map API
    • Bindings for C, Rust & Python 3
    • REST API with optional HTTP client+server with push notification support

    Documentation

    See the wiki: https://github.com/savoirfairelinux/opendht/wiki

    How-to build and install

    Build instructions: https://github.com/savoirfairelinux/opendht/wiki/Build-the-library

    How-to build a simple client app

    g++ main.cpp -std=c++17 -lopendht

    Examples

    C++ example

    The tools directory includes simple example programs :

    • dhtnode, a command line tool, allowing to run a DHT node and perform operations supported by the library (get, put etc.) with text values.
    • dhtchat, a very simple IM client working over the dht.

    Example program launching a DHT node, connecting to the network and performing some basic operations:

    #include <opendht.h>
    #include <vector>
    
    int main()
    {
        dht::DhtRunner node;
    
        // Launch a dht node on a new thread, using a
        // generated RSA key pair, and listen on port 4222.
        node.run(4222, dht::crypto::generateIdentity(), true);
    
        // Join the network through any running node,
        // here using a known bootstrap node.
        node.bootstrap("bootstrap.jami.net", "4222");
    
        // put some data on the dht
        std::vector<uint8_t> some_data(5, 10);
        node.put("unique_key", some_data);
    
        // put some data on the dht, signed with our generated private key
        node.putSigned("unique_key_42", some_data);
    
        // get data from the dht
        node.get("other_unique_key", [](const std::vector<std::shared_ptr<dht::Value>>& values) {
            // Callback called when values are found
            for (const auto& value : values)
                std::cout << "Found value: " << *value << std::endl;
            return true; // return false to stop the search
        });
    
        // wait for dht threads to end
        node.join();
        return 0;
    }

    Python 3 example

    import opendht as dht
    
    node = dht.DhtRunner()
    node.run()
    
    # Join the network through any running node,
    # here using a known bootstrap node.
    node.bootstrap("bootstrap.jami.net", "4222")
    
    # blocking call (provide callback arguments to make the call non-blocking)
    node.put(dht.InfoHash.get("unique_key"), dht.Value(b'some binary data'))
    
    results = node.get(dht.InfoHash.get("unique_key"))
    for r in results:
        print(r)

    Dependencies

    • msgpack-c 1.2+, used for data serialization.
    • GnuTLS 3.3+, used for cryptographic operations.
    • Nettle 2.4+, a GnuTLS dependency for crypto.
    • (optional) restinio used for the REST API.
    • (optional) jsoncpp 1.7.4-3+, used for the REST API.
    • Build tested with GCC 7+ (GNU/Linux, Windows with MinGW), Clang/LLVM (GNU/Linux, Android, macOS, iOS).
    • Build tested with Microsoft Visual Studio 2017, 2019, 2022

    Contact

    IRC: join us on Libera.chat at #opendht.

    License

    Copyright (C) 2014-2022 Savoir-faire Linux Inc.

    OpenDHT is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version.

    This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

    See COPYING or https://www.gnu.org/licenses/gpl-3.0.en.html for the full GPLv3 license.

    Acknowledgements

    This project was originally based on https://github.com/jech/dht by Juliusz Chroboczek. It is independent from another project called OpenDHT (Sean Rhea. Ph.D. Thesis, 2005), now extinct.

    Donations

    We gratefully accept Bitcoin donations to support OpenDHT development at: bitcoin:3EykSd1An888efq4Bq3KaV3hJ3JQ4FPnwm.