125 lines
3.8 KiB
Python
Executable File
125 lines
3.8 KiB
Python
Executable File
import argparse
|
|
import asyncio
|
|
import sys
|
|
import urllib.request
|
|
|
|
import multiaddr
|
|
|
|
from libp2p import new_node
|
|
from libp2p.peer.peerinfo import info_from_p2p_addr
|
|
|
|
PROTOCOL_ID = "/chat/1.0.0"
|
|
|
|
|
|
async def read_data(stream):
|
|
while True:
|
|
read_string = await stream.read()
|
|
if read_string is not None:
|
|
read_string = read_string.decode()
|
|
if read_string != "\n":
|
|
# Green console colour: \x1b[32m
|
|
# Reset console colour: \x1b[0m
|
|
print("\x1b[32m %s\x1b[0m " % read_string, end="")
|
|
|
|
|
|
# FIXME(mhchia): Reconsider whether we should use a thread pool here.
|
|
async def write_data(stream):
|
|
loop = asyncio.get_event_loop()
|
|
while True:
|
|
line = await loop.run_in_executor(None, sys.stdin.readline)
|
|
await stream.write(line.encode())
|
|
|
|
|
|
async def run(port, destination, localhost):
|
|
if localhost:
|
|
ip = "127.0.0.1"
|
|
else:
|
|
ip = urllib.request.urlopen("https://v4.ident.me/").read().decode("utf8")
|
|
transport_opt = f"/ip4/{ip}/tcp/{port}"
|
|
host = await new_node(transport_opt=[transport_opt])
|
|
|
|
await host.get_network().listen(multiaddr.Multiaddr(transport_opt))
|
|
|
|
if not destination: # its the server
|
|
|
|
async def stream_handler(stream):
|
|
asyncio.ensure_future(read_data(stream))
|
|
asyncio.ensure_future(write_data(stream))
|
|
|
|
host.set_stream_handler(PROTOCOL_ID, stream_handler)
|
|
|
|
localhost_opt = " --localhost" if localhost else ""
|
|
|
|
print(
|
|
f"Run 'python ./examples/chat/chat.py"
|
|
+ localhost_opt
|
|
+ f" -p {int(port) + 1} -d /ip4/{ip}/tcp/{port}/p2p/{host.get_id().pretty()}'"
|
|
+ " on another console."
|
|
)
|
|
print("Waiting for incoming connection...")
|
|
|
|
else: # its the client
|
|
maddr = multiaddr.Multiaddr(destination)
|
|
info = info_from_p2p_addr(maddr)
|
|
# Associate the peer with local ip address
|
|
await host.connect(info)
|
|
|
|
# Start a stream with the destination.
|
|
# Multiaddress of the destination peer is fetched from the peerstore using 'peerId'.
|
|
stream = await host.new_stream(info.peer_id, [PROTOCOL_ID])
|
|
|
|
asyncio.ensure_future(read_data(stream))
|
|
asyncio.ensure_future(write_data(stream))
|
|
print("Connected to peer %s" % info.addrs[0])
|
|
|
|
|
|
def main():
|
|
description = """
|
|
This program demonstrates a simple p2p chat application using libp2p.
|
|
To use it, first run 'python ./chat -p <PORT>', where <PORT> is the port number.
|
|
Then, run another host with 'python ./chat -p <ANOTHER_PORT> -d <DESTINATION>',
|
|
where <DESTINATION> is the multiaddress of the previous listener host.
|
|
"""
|
|
example_maddr = (
|
|
"/ip4/127.0.0.1/tcp/8000/p2p/QmQn4SwGkDZKkUEpBRBvTmheQycxAHJUNmVEnjA2v1qe8Q"
|
|
)
|
|
parser = argparse.ArgumentParser(description=description)
|
|
parser.add_argument(
|
|
"--debug",
|
|
action="store_true",
|
|
help="generate the same node ID on every execution",
|
|
)
|
|
parser.add_argument(
|
|
"-p", "--port", default=8000, type=int, help="source port number"
|
|
)
|
|
parser.add_argument(
|
|
"-d",
|
|
"--destination",
|
|
type=str,
|
|
help=f"destination multiaddr string, e.g. {example_maddr}",
|
|
)
|
|
parser.add_argument(
|
|
"-l",
|
|
"--localhost",
|
|
dest="localhost",
|
|
action="store_true",
|
|
help="flag indicating if localhost should be used or an external IP",
|
|
)
|
|
args = parser.parse_args()
|
|
|
|
if not args.port:
|
|
raise RuntimeError("was not able to determine a local port")
|
|
|
|
loop = asyncio.get_event_loop()
|
|
try:
|
|
asyncio.ensure_future(run(args.port, args.destination, args.localhost))
|
|
loop.run_forever()
|
|
except KeyboardInterrupt:
|
|
pass
|
|
finally:
|
|
loop.close()
|
|
|
|
|
|
if __name__ == "__main__":
|
|
main()
|