BulletinBoard DHT

BulletinBoard is a general-purpose Distributed-Hash-Table based on Kademlia [1]. The interface is provided as a D-Bus service via these commands:

Service: org.manuel.BulletinBoard
  Object Path: /
  Interface:   org.manuel.BulletinBoard
  Commands:
   - Get(app_id: String, key: Array of Bytes)
        -> (values: Array of [Array of Bytes])
   - Put(app_id: String, key: Array of Bytes, value: Array of Bytes)
        -> ()

where app_id is an string specific to your application (e.g. myfilesharingapp). You can choose any app_id you want and you do not have to register you own app_id somewhere. The key is hashed together with app_id using SHA-1 and the value must not exceed 2048 bytes. Note that you cannot assume that a value returned by the Get command was really published by an instance of your application. The lifetime for a value you Put in the DHT is 15 minutes, so you should call Put every, say, 10 minutes to make sure it stays in the DHT.

[1] http://pdos.csail.mit.edu/~petar/papers/maymounkov-kademlia-lncs.pdf

Getting Started

1. Get Rust

2. Clone

    git clone https://github.com/manuels/bulletinboard-dht.git
   

3. Build

    cargo build --release
   

   (in bulletinboard-dht dir)

4. Join the DHT

    ./target/release/bulletinboard -j 94.23.110.187:6666
   

   94.23.110.187 is currently the only supernode

5. Access DBus service

    # Put() and Get() for key=[0xDE,0xAD] and value=[0xBE, 0xEF] (app_id="test")
    $ dbus-send --session --type=method_call \
       --dest=org.manuel.BulletinBoard / \
       org.manuel.BulletinBoard.Put string:"test" \
       array:byte:0xDE,0xAD array:byte:0xBE,0xEF
   
    $ dbus-send --session --reply-timeout=60000 --print-reply \
       --type=method_call --dest=org.manuel.BulletinBoard / \
       org.manuel.BulletinBoard.Get string:"test" array:byte:0xDE,0xAD
    array [
       array of bytes [
          be ef
       ]
    ]