Python Distributed Hash Table
Documentation can be found at kademlia.readthedocs.org.
This library is an asynchronous Python implementation of the Kademlia distributed hash table. It uses Twisted to provide asynchronous communication. The nodes communicate using RPC over UDP to communiate, meaning that it is capable of working behind a NAT.
This library aims to be as close to a reference implementation of the Kademlia paper as possible.
pip install kademlia
This assumes you have a working familiarity with Twisted.
Assuming you want to connect to an existing network (run the standalone server example below if you don't have a network):
from twisted.internet import reactor from twisted.python import log from kademlia.network import Server import sys # log to std out log.startLogging(sys.stdout) def quit(result): print "Key result:", result reactor.stop() def get(result, server): return server.get("a key").addCallback(quit) def done(found, server): log.msg("Found nodes: %s" % found) return server.set("a key", "a value").addCallback(get, server) server = Server() # next line, or use reactor.listenUDP(5678, server.protocol) server.listen(5678) server.bootstrap([('127.0.0.1', 1234)]).addCallback(done, server) reactor.run()
Check out the examples folder for other examples.
If all you want to do is run a local server, just start the example server:
twistd -noy examples/server.tac
To run tests:
Fidelity to Original Paper
The current implementation should be an accurate implementation of all aspects of the paper save one - in Section 2.3 there is the requirement that the original publisher of a key/value republish it every 24 hours. This library does not do this (though you can easily do this manually).