3372c32432
- Fix examples `chat.py` and `echo.py`
- Use trio directly, instead of `trio-asyncio`
- Remove redundant code
- Change entry API `new_node` to `new_host_trio`
118 lines
3.5 KiB
Python
118 lines
3.5 KiB
Python
import argparse
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import multiaddr
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import trio
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from libp2p import new_host_trio
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from libp2p.crypto.secp256k1 import create_new_key_pair
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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("/echo/1.0.0")
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async def _echo_stream_handler(stream: INetStream) -> None:
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# Wait until EOF
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msg = await stream.read()
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await stream.write(msg)
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await stream.close()
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async def run(port: int, destination: str, seed: int = None) -> None:
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localhost_ip = "127.0.0.1"
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listen_addr = multiaddr.Multiaddr(f"/ip4/0.0.0.0/tcp/{port}")
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if seed:
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import random
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random.seed(seed)
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secret_number = random.getrandbits(32 * 8)
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secret = secret_number.to_bytes(length=32, byteorder="big")
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else:
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import secrets
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secret = secrets.token_bytes(32)
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async with new_host_trio(
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listen_addrs=[listen_addr], key_pair=create_new_key_pair(secret)
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) as host:
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print(f"I am {host.get_id().to_string()}")
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if not destination: # its the server
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host.set_stream_handler(PROTOCOL_ID, _echo_stream_handler)
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print(
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f"Run 'python ./examples/echo/echo.py "
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f"-p {int(port) + 1} "
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f"-d /ip4/{localhost_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 connections...")
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await trio.sleep_forever()
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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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msg = b"hi, there!\n"
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await stream.write(msg)
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# Notify the other side about EOF
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await stream.close()
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response = await stream.read()
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print(f"Sent: {msg}")
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print(f"Got: {response}")
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def main() -> None:
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description = """
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This program demonstrates a simple echo protocol where a peer listens for
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connections and copies back any input received on a stream.
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To use it, first run 'python ./echo -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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"-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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"-s",
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"--seed",
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type=int,
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help="provide a seed to the random number generator (e.g. to fix peer IDs across runs)",
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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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try:
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trio.run(run, args.port, args.destination, args.seed)
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except KeyboardInterrupt:
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pass
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if __name__ == "__main__":
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main()
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