| import argparse |
| import sys |
|
|
| import multiaddr |
| import trio |
|
|
| from libp2p import ( |
| new_host, |
| ) |
| from libp2p.network.stream.net_stream_interface import ( |
| INetStream, |
| ) |
| from libp2p.peer.peerinfo import ( |
| info_from_p2p_addr, |
| ) |
| from libp2p.typing import ( |
| TProtocol, |
| ) |
|
|
| PROTOCOL_ID = TProtocol("/chat/1.0.0") |
| MAX_READ_LEN = 2**32 - 1 |
|
|
|
|
| async def read_data(stream: INetStream) -> None: |
| while True: |
| read_bytes = await stream.read(MAX_READ_LEN) |
| if read_bytes is not None: |
| read_string = read_bytes.decode() |
| if read_string != "\n": |
| |
| |
| print("\x1b[32m %s\x1b[0m " % read_string, end="") |
|
|
|
|
| async def write_data(stream: INetStream) -> None: |
| async_f = trio.wrap_file(sys.stdin) |
| while True: |
| line = await async_f.readline() |
| await stream.write(line.encode()) |
|
|
|
|
| async def run(port: int, destination: str) -> None: |
| localhost_ip = "127.0.0.1" |
| listen_addr = multiaddr.Multiaddr(f"/ip4/0.0.0.0/tcp/{port}") |
| host = new_host() |
| async with host.run(listen_addrs=[listen_addr]), trio.open_nursery() as nursery: |
| if not destination: |
|
|
| async def stream_handler(stream: INetStream) -> None: |
| nursery.start_soon(read_data, stream) |
| nursery.start_soon(write_data, stream) |
|
|
| host.set_stream_handler(PROTOCOL_ID, stream_handler) |
|
|
| print( |
| "Run this from the same folder in another console:\n\n" |
| f"python chat.py -p {int(port) + 1} " |
| f"-d /ip4/{localhost_ip}/tcp/{port}/p2p/{host.get_id().pretty()}\n" |
| ) |
| print("Waiting for incoming connection...") |
|
|
| else: |
| maddr = multiaddr.Multiaddr(destination) |
| info = info_from_p2p_addr(maddr) |
| |
| await host.connect(info) |
| |
| |
| |
| stream = await host.new_stream(info.peer_id, [PROTOCOL_ID]) |
|
|
| nursery.start_soon(read_data, stream) |
| nursery.start_soon(write_data, stream) |
| print(f"Connected to peer {info.addrs[0]}") |
|
|
| await trio.sleep_forever() |
|
|
|
|
| def main() -> None: |
| 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( |
| "-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}", |
| ) |
| args = parser.parse_args() |
|
|
| if not args.port: |
| raise RuntimeError("was not able to determine a local port") |
|
|
| try: |
| trio.run(run, *(args.port, args.destination)) |
| except KeyboardInterrupt: |
| pass |
|
|
|
|
| if __name__ == "__main__": |
| main() |
|
|
