b1248ff315
extended _multiaddr_from_socket to support UDP and IPv6 automatically changed TCPListener to use _ip4_or_6_from_multiaddr to get host, and not ip4 only enforced `from error` everywhere with raises added call braces to exceptions
136 lines
4.5 KiB
Python
136 lines
4.5 KiB
Python
import asyncio
|
|
from typing import Dict
|
|
import uuid
|
|
|
|
from libp2p.host.host_interface import IHost
|
|
from libp2p.pubsub.floodsub import FloodSub
|
|
from libp2p.pubsub.pubsub import Pubsub
|
|
from libp2p.tools.constants import LISTEN_MADDR
|
|
from libp2p.tools.factories import FloodsubFactory, PubsubFactory
|
|
|
|
CRYPTO_TOPIC = "ethereum"
|
|
|
|
# Message format:
|
|
# Sending crypto: <source>,<dest>,<amount as integer>
|
|
# Ex. send,aspyn,alex,5
|
|
# Set crypto: <dest>,<amount as integer>
|
|
# Ex. set,rob,5
|
|
# Determine message type by looking at first item before first comma
|
|
|
|
|
|
class DummyAccountNode:
|
|
"""
|
|
Node which has an internal balance mapping, meant to serve as a dummy
|
|
crypto blockchain.
|
|
|
|
There is no actual blockchain, just a simple map indicating how much
|
|
crypto each user in the mappings holds
|
|
"""
|
|
|
|
libp2p_node: IHost
|
|
pubsub: Pubsub
|
|
floodsub: FloodSub
|
|
|
|
def __init__(self, libp2p_node: IHost, pubsub: Pubsub, floodsub: FloodSub):
|
|
self.libp2p_node = libp2p_node
|
|
self.pubsub = pubsub
|
|
self.floodsub = floodsub
|
|
self.balances: Dict[str, int] = {}
|
|
self.node_id = str(uuid.uuid1())
|
|
|
|
@classmethod
|
|
async def create(cls) -> "DummyAccountNode":
|
|
"""
|
|
Create a new DummyAccountNode and attach a libp2p node, a floodsub, and
|
|
a pubsub instance to this new node.
|
|
|
|
We use create as this serves as a factory function and allows us
|
|
to use async await, unlike the init function
|
|
"""
|
|
|
|
pubsub = PubsubFactory(router=FloodsubFactory())
|
|
await pubsub.host.get_network().listen(LISTEN_MADDR)
|
|
return cls(libp2p_node=pubsub.host, pubsub=pubsub, floodsub=pubsub.router)
|
|
|
|
async def handle_incoming_msgs(self) -> None:
|
|
"""Handle all incoming messages on the CRYPTO_TOPIC from peers."""
|
|
while True:
|
|
incoming = await self.q.get()
|
|
msg_comps = incoming.data.decode("utf-8").split(",")
|
|
|
|
if msg_comps[0] == "send":
|
|
self.handle_send_crypto(msg_comps[1], msg_comps[2], int(msg_comps[3]))
|
|
elif msg_comps[0] == "set":
|
|
self.handle_set_crypto(msg_comps[1], int(msg_comps[2]))
|
|
|
|
async def setup_crypto_networking(self) -> None:
|
|
"""Subscribe to CRYPTO_TOPIC and perform call to function that handles
|
|
all incoming messages on said topic."""
|
|
self.q = await self.pubsub.subscribe(CRYPTO_TOPIC)
|
|
|
|
asyncio.ensure_future(self.handle_incoming_msgs())
|
|
|
|
async def publish_send_crypto(
|
|
self, source_user: str, dest_user: str, amount: int
|
|
) -> None:
|
|
"""
|
|
Create a send crypto message and publish that message to all other
|
|
nodes.
|
|
|
|
:param source_user: user to send crypto from
|
|
:param dest_user: user to send crypto to
|
|
:param amount: amount of crypto to send
|
|
"""
|
|
msg_contents = f"send,{source_user},{dest_user},{amount!s}"
|
|
await self.pubsub.publish(CRYPTO_TOPIC, msg_contents.encode())
|
|
|
|
async def publish_set_crypto(self, user: str, amount: int) -> None:
|
|
"""
|
|
Create a set crypto message and publish that message to all other
|
|
nodes.
|
|
|
|
:param user: user to set crypto for
|
|
:param amount: amount of crypto
|
|
"""
|
|
msg_contents = f"set,{user},{amount!s}"
|
|
await self.pubsub.publish(CRYPTO_TOPIC, msg_contents.encode())
|
|
|
|
def handle_send_crypto(self, source_user: str, dest_user: str, amount: int) -> None:
|
|
"""
|
|
Handle incoming send_crypto message.
|
|
|
|
:param source_user: user to send crypto from
|
|
:param dest_user: user to send crypto to
|
|
:param amount: amount of crypto to send
|
|
"""
|
|
if source_user in self.balances:
|
|
self.balances[source_user] -= amount
|
|
else:
|
|
self.balances[source_user] = -amount
|
|
|
|
if dest_user in self.balances:
|
|
self.balances[dest_user] += amount
|
|
else:
|
|
self.balances[dest_user] = amount
|
|
|
|
def handle_set_crypto(self, dest_user: str, amount: int) -> None:
|
|
"""
|
|
Handle incoming set_crypto message.
|
|
|
|
:param dest_user: user to set crypto for
|
|
:param amount: amount of crypto
|
|
"""
|
|
self.balances[dest_user] = amount
|
|
|
|
def get_balance(self, user: str) -> int:
|
|
"""
|
|
Get balance in crypto for a particular user.
|
|
|
|
:param user: user to get balance for
|
|
:return: balance of user
|
|
"""
|
|
if user in self.balances:
|
|
return self.balances[user]
|
|
else:
|
|
return -1
|