py-libp2p/libp2p/__init__.py
2019-08-02 23:26:06 +08:00

136 lines
3.9 KiB
Python

import asyncio
from Crypto.PublicKey import RSA
from .security.insecure_security import InsecureTransport
from .peer.peerstore import PeerStore
from .peer.id import ID
from .network.swarm import Swarm
from .host.basic_host import BasicHost
from .transport.upgrader import TransportUpgrader
from .transport.tcp.tcp import TCP
from .kademlia.network import KademliaServer
from .routing.kademlia.kademlia_peer_router import KadmeliaPeerRouter
async def cleanup_done_tasks():
"""
clean up asyncio done tasks to free up resources
"""
while True:
for task in asyncio.all_tasks():
if task.done():
await task
# Need not run often
# Some sleep necessary to context switch
await asyncio.sleep(3)
def generate_id():
new_key = RSA.generate(2048, e=65537)
new_id = ID.from_pubkey(new_key.publickey())
# private_key = new_key.exportKey("PEM")
return new_id
def initialize_default_kademlia_router(ksize=20, alpha=3, id_opt=None, storage=None):
"""
initialize kadmelia router when no kademlia router is passed in
:param ksize: The k parameter from the paper
:param alpha: The alpha parameter from the paper
:param id_opt: optional id for host
:param storage: An instance that implements
:interface:`~kademlia.storage.IStorage`
:return: return a default kademlia instance
"""
if not id_opt:
id_opt = generate_id()
node_id = id_opt.to_bytes()
server = KademliaServer(ksize=ksize, alpha=alpha, node_id=node_id, storage=storage)
return KadmeliaPeerRouter(server)
def initialize_default_swarm(
id_opt=None,
transport_opt=None,
muxer_opt=None,
sec_opt=None,
peerstore_opt=None,
disc_opt=None,
):
"""
initialize swarm when no swarm is passed in
:param id_opt: optional id for host
:param transport_opt: optional choice of transport upgrade
:param muxer_opt: optional choice of stream muxer
:param sec_opt: optional choice of security upgrade
:param peerstore_opt: optional peerstore
:param disc_opt: optional discovery
:return: return a default swarm instance
"""
if not id_opt:
id_opt = generate_id()
# TODO parse transport_opt to determine transport
transport_opt = transport_opt or ["/ip4/127.0.0.1/tcp/8001"]
transport = TCP()
# TODO TransportUpgrader is not doing anything really
# TODO parse muxer and sec to pass into TransportUpgrader
muxer = muxer_opt or ["mplex/6.7.0"]
sec = sec_opt or {"insecure/1.0.0": InsecureTransport("insecure")}
upgrader = TransportUpgrader(sec, muxer)
peerstore = peerstore_opt or PeerStore()
# TODO: Initialize discovery if not presented
swarm_opt = Swarm(id_opt, peerstore, upgrader, transport, disc_opt)
return swarm_opt
async def new_node(
swarm_opt=None,
id_opt=None,
transport_opt=None,
muxer_opt=None,
sec_opt=None,
peerstore_opt=None,
disc_opt=None,
):
"""
create new libp2p node
:param swarm_opt: optional swarm
:param id_opt: optional id for host
:param transport_opt: optional choice of transport upgrade
:param muxer_opt: optional choice of stream muxer
:param sec_opt: optional choice of security upgrade
:param peerstore_opt: optional peerstore
:param disc_opt: optional discovery
:return: return a host instance
"""
if not id_opt:
id_opt = generate_id()
if not swarm_opt:
swarm_opt = initialize_default_swarm(
id_opt=id_opt,
transport_opt=transport_opt,
muxer_opt=muxer_opt,
sec_opt=sec_opt,
peerstore_opt=peerstore_opt,
disc_opt=disc_opt,
)
# TODO enable support for other host type
# TODO routing unimplemented
host = BasicHost(swarm_opt)
# Kick off cleanup job
asyncio.ensure_future(cleanup_done_tasks())
return host