py-libp2p/examples/chat/chat.py

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import argparse
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import asyncio
import sys
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import urllib.request
import multiaddr
from libp2p import new_node
from libp2p.peer.peerinfo import info_from_p2p_addr
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PROTOCOL_ID = '/chat/1.0.0'
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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="")
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# FIXME(mhchia): Reconsider whether we should use a thread pool here.
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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())
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async def run(port, destination):
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external_ip = urllib.request.urlopen(
'https://v4.ident.me/').read().decode('utf8')
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transport_opt = "/ip4/%s/tcp/%s" % (external_ip, port)
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host = await new_node(
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transport_opt=[transport_opt])
await host.get_network().listen(multiaddr.Multiaddr(transport_opt))
if not destination: # its the server
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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)
if not port:
raise RuntimeError("was not able to find the actual local port")
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print("Run './examples/chat/chat.py -p %s -d /ip4/%s/tcp/%s/p2p/%s' on another console.\n" %
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(int(port) + 1, external_ip, port, host.get_id().pretty()))
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print("\nWaiting for incoming connection\n\n")
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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)
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# 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])
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asyncio.ensure_future(read_data(stream))
asyncio.ensure_future(write_data(stream))
print("Connected to peer %s" % info.addrs[0])
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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,
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type=int,
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help="source port number",
)
parser.add_argument(
"-d",
"--destination",
type=str,
help=f"destination multiaddr string, e.g. {example_maddr}",
)
args = parser.parse_args()
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loop = asyncio.get_event_loop()
try:
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asyncio.ensure_future(run(args.port, args.destination))
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loop.run_forever()
except KeyboardInterrupt:
pass
finally:
loop.close()
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if __name__ == '__main__':
main()