127 lines
4.0 KiB
Python
Executable File
127 lines
4.0 KiB
Python
Executable File
import argparse
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import asyncio
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import sys
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import urllib.request
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import multiaddr
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from libp2p import new_node
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from libp2p.network.stream.net_stream_interface import INetStream
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from libp2p.peer.peerinfo import info_from_p2p_addr
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from libp2p.typing import TProtocol
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PROTOCOL_ID = TProtocol("/chat/1.0.0")
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MAX_READ_LEN = 2 ** 32 - 1
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async def read_data(stream: INetStream) -> None:
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while True:
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read_bytes = await stream.read(MAX_READ_LEN)
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if read_bytes is not None:
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read_string = read_bytes.decode()
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if read_string != "\n":
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# Green console colour: \x1b[32m
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# Reset console colour: \x1b[0m
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print("\x1b[32m %s\x1b[0m " % read_string, end="")
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async def write_data(stream: INetStream) -> None:
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loop = asyncio.get_event_loop()
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while True:
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line = await loop.run_in_executor(None, sys.stdin.readline)
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await stream.write(line.encode())
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async def run(port: int, destination: str, localhost: bool) -> None:
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if localhost:
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ip = "127.0.0.1"
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else:
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ip = urllib.request.urlopen("https://v4.ident.me/").read().decode("utf8")
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transport_opt = f"/ip4/{ip}/tcp/{port}"
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host = await new_node(transport_opt=[transport_opt])
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await host.get_network().listen(multiaddr.Multiaddr(transport_opt))
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if not destination: # its the server
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async def stream_handler(stream: INetStream) -> None:
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asyncio.ensure_future(read_data(stream))
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asyncio.ensure_future(write_data(stream))
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host.set_stream_handler(PROTOCOL_ID, stream_handler)
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localhost_opt = " --localhost" if localhost else ""
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print(
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f"Run 'python ./examples/chat/chat.py"
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+ localhost_opt
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+ f" -p {int(port) + 1} -d /ip4/{ip}/tcp/{port}/p2p/{host.get_id().pretty()}'"
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+ " on another console."
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)
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print("Waiting for incoming connection...")
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else: # its the client
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maddr = multiaddr.Multiaddr(destination)
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info = info_from_p2p_addr(maddr)
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# Associate the peer with local ip address
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await host.connect(info)
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# Start a stream with the destination.
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# Multiaddress of the destination peer is fetched from the peerstore using 'peerId'.
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stream = await host.new_stream(info.peer_id, [PROTOCOL_ID])
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asyncio.ensure_future(read_data(stream))
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asyncio.ensure_future(write_data(stream))
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print("Connected to peer %s" % info.addrs[0])
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def main() -> None:
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description = """
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This program demonstrates a simple p2p chat application using libp2p.
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To use it, first run 'python ./chat -p <PORT>', where <PORT> is the port number.
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Then, run another host with 'python ./chat -p <ANOTHER_PORT> -d <DESTINATION>',
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where <DESTINATION> is the multiaddress of the previous listener host.
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"""
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example_maddr = (
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"/ip4/127.0.0.1/tcp/8000/p2p/QmQn4SwGkDZKkUEpBRBvTmheQycxAHJUNmVEnjA2v1qe8Q"
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)
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parser = argparse.ArgumentParser(description=description)
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parser.add_argument(
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"--debug",
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action="store_true",
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help="generate the same node ID on every execution",
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)
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parser.add_argument(
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"-p", "--port", default=8000, type=int, help="source port number"
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)
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parser.add_argument(
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"-d",
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"--destination",
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type=str,
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help=f"destination multiaddr string, e.g. {example_maddr}",
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)
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parser.add_argument(
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"-l",
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"--localhost",
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dest="localhost",
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action="store_true",
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help="flag indicating if localhost should be used or an external IP",
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)
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args = parser.parse_args()
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if not args.port:
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raise RuntimeError("was not able to determine a local port")
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loop = asyncio.get_event_loop()
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try:
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asyncio.ensure_future(run(args.port, args.destination, args.localhost))
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loop.run_forever()
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except KeyboardInterrupt:
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pass
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finally:
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loop.close()
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if __name__ == "__main__":
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main()
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