c61a06706a
- Add `close` and `disconnect` in `Host` - Add `close` and `close_peer` in `Network` - Change `IListener.close` to async, to await for server's closing - Add factories for security transports, and modify `HostFactory`
131 lines
4.4 KiB
Python
131 lines
4.4 KiB
Python
import asyncio
|
|
import uuid
|
|
|
|
from libp2p.host.host_interface import IHost
|
|
from libp2p.pubsub.floodsub import FloodSub
|
|
from libp2p.pubsub.pubsub import Pubsub
|
|
from tests.configs import LISTEN_MADDR
|
|
from tests.factories import FloodsubFactory, PubsubFactory
|
|
|
|
from .utils import message_id_generator
|
|
|
|
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 = {}
|
|
self.next_msg_id_func = message_id_generator(0)
|
|
self.node_id = str(uuid.uuid1())
|
|
|
|
@classmethod
|
|
async def create(cls):
|
|
"""
|
|
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):
|
|
"""
|
|
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):
|
|
"""
|
|
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, dest_user, amount):
|
|
"""
|
|
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 = "send," + source_user + "," + dest_user + "," + str(amount)
|
|
await self.pubsub.publish(CRYPTO_TOPIC, msg_contents.encode())
|
|
|
|
async def publish_set_crypto(self, user, amount):
|
|
"""
|
|
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 = "set," + user + "," + str(amount)
|
|
await self.pubsub.publish(CRYPTO_TOPIC, msg_contents.encode())
|
|
|
|
def handle_send_crypto(self, source_user, dest_user, amount):
|
|
"""
|
|
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, amount):
|
|
"""
|
|
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):
|
|
"""
|
|
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
|