130 lines
2.9 KiB
Python
130 lines
2.9 KiB
Python
"""
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Bidirectional streaming.
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"""
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import pytest
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import trio
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import tractor
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@tractor.context
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async def simple_rpc(
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ctx: tractor.Context,
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data: int,
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) -> None:
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'''
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Test a small ping-pong server.
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'''
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# signal to parent that we're up
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await ctx.started(data + 1)
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print('opening stream in callee')
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async with ctx.open_stream() as stream:
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count = 0
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while True:
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try:
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await stream.receive() == 'ping'
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except trio.EndOfChannel:
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assert count == 10
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break
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else:
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print('pong')
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await stream.send('pong')
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count += 1
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@tractor.context
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async def simple_rpc_with_forloop(
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ctx: tractor.Context,
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data: int,
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) -> None:
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"""Same as previous test but using ``async for`` syntax/api.
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"""
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# signal to parent that we're up
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await ctx.started(data + 1)
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print('opening stream in callee')
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async with ctx.open_stream() as stream:
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count = 0
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async for msg in stream:
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assert msg == 'ping'
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print('pong')
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await stream.send('pong')
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count += 1
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else:
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assert count == 10
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@pytest.mark.parametrize(
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'use_async_for',
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[True, False],
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)
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@pytest.mark.parametrize(
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'server_func',
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[simple_rpc, simple_rpc_with_forloop],
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)
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def test_simple_rpc(server_func, use_async_for):
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'''
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The simplest request response pattern.
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'''
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async def main():
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async with tractor.open_nursery() as n:
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portal = await n.start_actor(
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'rpc_server',
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enable_modules=[__name__],
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)
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async with portal.open_context(
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server_func, # taken from pytest parameterization
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data=10,
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) as (ctx, sent):
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assert sent == 11
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async with ctx.open_stream() as stream:
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if use_async_for:
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count = 0
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# receive msgs using async for style
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print('ping')
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await stream.send('ping')
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async for msg in stream:
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assert msg == 'pong'
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print('ping')
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await stream.send('ping')
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count += 1
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if count >= 9:
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break
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else:
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# classic send/receive style
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for _ in range(10):
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print('ping')
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await stream.send('ping')
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assert await stream.receive() == 'pong'
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# stream should terminate here
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# final context result(s) should be consumed here in __aexit__()
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await portal.cancel_actor()
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trio.run(main)
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