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 the asyncio library in Python 3 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 asyncio.
Assuming you want to connect to an existing network:
import asyncio from kademlia.network import Server # Create a node and start listening on port 5678 node = Server() node.listen(5678) # Bootstrap the node by connecting to other known nodes, in this case # replace 220.127.116.11 with the IP of another node and optionally # give as many ip/port combos as you can for other nodes. loop = asyncio.get_event_loop() loop.run_until_complete(node.bootstrap([("18.104.22.168", 5678)])) # set a value for the key "my-key" on the network loop.run_until_complete(node.set("my-key", "my awesome value")) # get the value associated with "my-key" from the network result = loop.run_until_complete(node.get("my-key")) print(result)
Initializing a Network
If you're starting a new network from scratch, just omit the
node.bootstrap call in the example above. Then, bootstrap other nodes by connecting to the first node you started.
See the examples folder for a first node example that other nodes can bootstrap connect to and some code that gets and sets a key/value.
This library uses the standard Python logging library. To see debut output printed to STDOUT, for instance, use:
import logging log = logging.getLogger('kademlia') log.setLevel(logging.DEBUG) log.addHandler(logging.StreamHandler())
To run tests:
pip install -r dev-requirements.txt python -m unittest
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).