py-libp2p/tests/examples/test_chat.py

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#!/bin/env python3
import asyncio
import sys
import click
import multiaddr
import pytest
from libp2p.libp2p import *
from peer.peerinfo import info_from_p2p_addr
from protocol_muxer.multiselect_client import MultiselectClientError
PROTOCOL_ID = '/chat/1.0.0'
async def hello_world(host_a, host_b):
async def stream_handler(stream):
read = await stream.read()
assert read == b'hello world from host b'
await stream.write(b'hello world from host a')
await stream.close()
host_a.set_stream_handler(PROTOCOL_ID, stream_handler)
# Start a stream with the destination.
# Multiaddress of the destination peer is fetched from the peerstore using 'peerId'.
stream = await host_b.new_stream(host_a.get_id(), [PROTOCOL_ID])
await stream.write(b'hello world from host b')
read = await stream.read()
assert read == b'hello world from host a'
await stream.close()
async def connect_write(host_a, host_b):
messages = [b'data %d' % i for i in range(5)]
async def stream_handler(stream):
received = []
while True:
try:
received.append((await stream.read()).decode())
except Exception: # exception is raised when other side close the stream ?
break
await stream.close()
assert received == messages
host_a.set_stream_handler(PROTOCOL_ID, stream_handler)
# Start a stream with the destination.
# Multiaddress of the destination peer is fetched from the peerstore using 'peerId'.
stream = await host_b.new_stream(host_a.get_id(), [PROTOCOL_ID])
for message in messages:
await stream.write(message)
await stream.close()
async def connect_read(host_a, host_b):
messages = [b'data %d' % i for i in range(5)]
async def stream_handler(stream):
for message in messages:
await stream.write(message)
await stream.close()
host_a.set_stream_handler(PROTOCOL_ID, stream_handler)
# Start a stream with the destination.
# Multiaddress of the destination peer is fetched from the peerstore using 'peerId'.
stream = await host_b.new_stream(host_a.get_id(), [PROTOCOL_ID])
received = []
# while True: Seems the close stream event from the other host is not received
for _ in range(5):
try:
received.append(await stream.read())
except Exception: # exception is raised when other side close the stream ?
break
await stream.close()
assert received == messages
async def no_common_protocol(host_a, host_b):
messages = [b'data %d' % i for i in range(5)]
async def stream_handler(stream):
for message in messages:
await stream.write(message)
await stream.close()
host_a.set_stream_handler(PROTOCOL_ID, stream_handler)
# try to creates a new new with a procotol not known by the other host
with pytest.raises(MultiselectClientError):
_ = await host_b.new_stream(host_a.get_id(), ['/fakeproto/0.0.1'])
@pytest.mark.asyncio
@pytest.mark.parametrize("test", [
(hello_world),
(connect_write),
(connect_read),
(no_common_protocol),
])
async def test_chat(test):
host_a = await new_node(transport_opt=["/ip4/127.0.0.1/tcp/0"])
host_b = await new_node(transport_opt=["/ip4/127.0.0.1/tcp/0"])
addr = host_a.get_addrs()[0]
info = info_from_p2p_addr(addr)
await host_b.connect(info)
await test(host_a, host_b)