import asyncio import sys import urllib.request import click 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="") 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): external_ip = urllib.request.urlopen( 'https://v4.ident.me/').read().decode('utf8') host = await new_node( transport_opt=["/ip4/%s/tcp/%s" % (external_ip, port)]) 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) port = None ip = None for listener in host.network.listeners.values(): for addr in listener.get_addrs(): ip = addr.value_for_protocol('ip4') port = int(addr.value_for_protocol('tcp')) if not port: raise RuntimeError("was not able to find the actual local port") print("Run './examples/chat/chat.py -p %s -d /ip4/%s/tcp/%s/p2p/%s' on another console.\n" % (int(port) + 1, ip, port, host.get_id().pretty())) print("\nWaiting for incoming connection\n\n") else: # its the client m = multiaddr.Multiaddr(destination) info = info_from_p2p_addr(m) # 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]) @click.command() @click.option('--port', '-p', help='source port number', default=8000) @click.option('--destination', '-d', help="Destination multiaddr string") @click.option('--help', is_flag=True, default=False, help='display help') # @click.option('--debug', is_flag=True, default=False, help='Debug generates the same node ID on every execution') def main(port, destination, help): if help: print("This program demonstrates a simple p2p chat application using libp2p\n\n") print("Usage: Run './chat -p ' where can be any port number.") print("Now run './chat -p -d ' where is multiaddress of previous listener host.") return loop = asyncio.get_event_loop() try: asyncio.ensure_future(run(port, destination)) loop.run_forever() except KeyboardInterrupt: pass finally: loop.close() if __name__ == '__main__': main()