Move context-streaming operational tests into one mod
Tyler Goodlet
parent
fd6f4574ce
commit
efba5229fc
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@ -1,418 +1,11 @@
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"""
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Bidirectional streaming and context API.
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Bidirectional streaming.
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"""
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import platform
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import pytest
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import trio
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import tractor
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from conftest import tractor_test
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# the general stream semantics are
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# - normal termination: far end relays a stop message which
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# terminates an ongoing ``MsgStream`` iteration
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# - cancel termination: context is cancelled on either side cancelling
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# the "linked" inter-actor task context
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_state: bool = False
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@tractor.context
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async def simple_setup_teardown(
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ctx: tractor.Context,
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data: int,
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block_forever: bool = False,
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) -> None:
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# startup phase
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global _state
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_state = True
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# signal to parent that we're up
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await ctx.started(data + 1)
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try:
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if block_forever:
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# block until cancelled
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await trio.sleep_forever()
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else:
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return 'yo'
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finally:
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_state = False
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async def assert_state(value: bool):
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global _state
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assert _state == value
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@pytest.mark.parametrize(
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'error_parent',
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[False, ValueError, KeyboardInterrupt],
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)
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@pytest.mark.parametrize(
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'callee_blocks_forever',
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[False, True],
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ids=lambda item: f'callee_blocks_forever={item}'
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)
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@pytest.mark.parametrize(
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'pointlessly_open_stream',
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[False, True],
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ids=lambda item: f'open_stream={item}'
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)
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def test_simple_context(
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error_parent,
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callee_blocks_forever,
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pointlessly_open_stream,
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):
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timeout = 1.5 if not platform.system() == 'Windows' else 4
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async def main():
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with trio.fail_after(timeout):
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async with tractor.open_nursery() as nursery:
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portal = await nursery.start_actor(
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'simple_context',
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enable_modules=[__name__],
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)
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try:
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async with portal.open_context(
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simple_setup_teardown,
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data=10,
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block_forever=callee_blocks_forever,
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) as (ctx, sent):
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assert sent == 11
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if callee_blocks_forever:
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await portal.run(assert_state, value=True)
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else:
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assert await ctx.result() == 'yo'
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if not error_parent:
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await ctx.cancel()
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if pointlessly_open_stream:
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async with ctx.open_stream():
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if error_parent:
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raise error_parent
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if callee_blocks_forever:
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await ctx.cancel()
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else:
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# in this case the stream will send a
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# 'stop' msg to the far end which needs
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# to be ignored
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pass
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else:
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if error_parent:
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raise error_parent
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finally:
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# after cancellation
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if not error_parent:
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await portal.run(assert_state, value=False)
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# shut down daemon
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await portal.cancel_actor()
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if error_parent:
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try:
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trio.run(main)
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except error_parent:
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pass
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except trio.MultiError as me:
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# XXX: on windows it seems we may have to expect the group error
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from tractor._exceptions import is_multi_cancelled
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assert is_multi_cancelled(me)
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else:
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trio.run(main)
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# basic stream terminations:
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# - callee context closes without using stream
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# - caller context closes without using stream
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# - caller context calls `Context.cancel()` while streaming
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# is ongoing resulting in callee being cancelled
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# - callee calls `Context.cancel()` while streaming and caller
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# sees stream terminated in `RemoteActorError`
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# TODO: future possible features
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# - restart request: far end raises `ContextRestart`
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@tractor.context
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async def close_ctx_immediately(
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ctx: tractor.Context,
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) -> None:
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await ctx.started()
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global _state
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async with ctx.open_stream():
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pass
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@tractor_test
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async def test_callee_closes_ctx_after_stream_open():
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'callee context closes without using stream'
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async with tractor.open_nursery() as n:
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portal = await n.start_actor(
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'fast_stream_closer',
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enable_modules=[__name__],
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)
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async with portal.open_context(
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close_ctx_immediately,
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# flag to avoid waiting the final result
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# cancel_on_exit=True,
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) as (ctx, sent):
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assert sent is None
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with trio.fail_after(0.5):
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async with ctx.open_stream() as stream:
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# should fall through since ``StopAsyncIteration``
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# should be raised through translation of
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# a ``trio.EndOfChannel`` by
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# ``trio.abc.ReceiveChannel.__anext__()``
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async for _ in stream:
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assert 0
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else:
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# verify stream is now closed
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try:
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await stream.receive()
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except trio.EndOfChannel:
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pass
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# TODO: should be just raise the closed resource err
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# directly here to enforce not allowing a re-open
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# of a stream to the context (at least until a time of
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# if/when we decide that's a good idea?)
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try:
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async with ctx.open_stream() as stream:
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pass
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except trio.ClosedResourceError:
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pass
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await portal.cancel_actor()
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@tractor.context
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async def expect_cancelled(
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ctx: tractor.Context,
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) -> None:
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global _state
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_state = True
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await ctx.started()
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try:
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async with ctx.open_stream() as stream:
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async for msg in stream:
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await stream.send(msg) # echo server
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except trio.Cancelled:
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# expected case
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_state = False
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raise
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else:
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assert 0, "Wasn't cancelled!?"
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@pytest.mark.parametrize(
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'use_ctx_cancel_method',
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[False, True],
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)
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@tractor_test
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async def test_caller_closes_ctx_after_callee_opens_stream(
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use_ctx_cancel_method: bool,
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):
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'caller context closes without using stream'
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async with tractor.open_nursery() as n:
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portal = await n.start_actor(
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'ctx_cancelled',
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enable_modules=[__name__],
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)
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async with portal.open_context(
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expect_cancelled,
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) as (ctx, sent):
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await portal.run(assert_state, value=True)
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assert sent is None
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# call cancel explicitly
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if use_ctx_cancel_method:
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await ctx.cancel()
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try:
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async with ctx.open_stream() as stream:
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async for msg in stream:
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pass
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except tractor.ContextCancelled:
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raise # XXX: must be propagated to __aexit__
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else:
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assert 0, "Should have context cancelled?"
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# channel should still be up
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assert portal.channel.connected()
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# ctx is closed here
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await portal.run(assert_state, value=False)
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else:
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try:
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with trio.fail_after(0.2):
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await ctx.result()
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assert 0, "Callee should have blocked!?"
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except trio.TooSlowError:
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await ctx.cancel()
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try:
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async with ctx.open_stream() as stream:
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async for msg in stream:
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pass
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except tractor.ContextCancelled:
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pass
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else:
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assert 0, "Should have received closed resource error?"
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# ctx is closed here
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await portal.run(assert_state, value=False)
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# channel should not have been destroyed yet, only the
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# inter-actor-task context
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assert portal.channel.connected()
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# teardown the actor
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await portal.cancel_actor()
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@tractor_test
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async def test_multitask_caller_cancels_from_nonroot_task():
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async with tractor.open_nursery() as n:
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portal = await n.start_actor(
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'ctx_cancelled',
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enable_modules=[__name__],
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)
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async with portal.open_context(
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expect_cancelled,
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) as (ctx, sent):
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await portal.run(assert_state, value=True)
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assert sent is None
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async with ctx.open_stream() as stream:
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async def send_msg_then_cancel():
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await stream.send('yo')
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await portal.run(assert_state, value=True)
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await ctx.cancel()
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await portal.run(assert_state, value=False)
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async with trio.open_nursery() as n:
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n.start_soon(send_msg_then_cancel)
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try:
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async for msg in stream:
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assert msg == 'yo'
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except tractor.ContextCancelled:
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raise # XXX: must be propagated to __aexit__
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# channel should still be up
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assert portal.channel.connected()
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# ctx is closed here
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await portal.run(assert_state, value=False)
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# channel should not have been destroyed yet, only the
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# inter-actor-task context
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assert portal.channel.connected()
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# teardown the actor
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await portal.cancel_actor()
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@tractor.context
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async def cancel_self(
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ctx: tractor.Context,
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) -> None:
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global _state
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_state = True
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await ctx.cancel()
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try:
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with trio.fail_after(0.1):
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await trio.sleep_forever()
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except trio.Cancelled:
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raise
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except trio.TooSlowError:
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# should never get here
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assert 0
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@tractor_test
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async def test_callee_cancels_before_started():
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'''
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Callee calls `Context.cancel()` while streaming and caller
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sees stream terminated in `ContextCancelled`.
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'''
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async with tractor.open_nursery() as n:
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portal = await n.start_actor(
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'cancels_self',
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enable_modules=[__name__],
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)
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try:
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async with portal.open_context(
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cancel_self,
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) as (ctx, sent):
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async with ctx.open_stream():
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await trio.sleep_forever()
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# raises a special cancel signal
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except tractor.ContextCancelled as ce:
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ce.type == trio.Cancelled
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# teardown the actor
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await portal.cancel_actor()
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@tractor.context
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async def simple_rpc(
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@ -6,6 +6,7 @@ a ``tractor.Context`` beforehand.
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'''
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from itertools import count
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import platform
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from typing import Optional
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import pytest
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@ -13,6 +14,411 @@ import trio
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import tractor
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from tractor._exceptions import StreamOverrun
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from conftest import tractor_test
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# the general stream semantics are
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# - normal termination: far end relays a stop message which
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# terminates an ongoing ``MsgStream`` iteration
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# - cancel termination: context is cancelled on either side cancelling
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# the "linked" inter-actor task context
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|
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_state: bool = False
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@tractor.context
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async def simple_setup_teardown(
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ctx: tractor.Context,
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data: int,
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block_forever: bool = False,
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) -> None:
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# startup phase
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global _state
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_state = True
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# signal to parent that we're up
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await ctx.started(data + 1)
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try:
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if block_forever:
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# block until cancelled
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await trio.sleep_forever()
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else:
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return 'yo'
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finally:
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_state = False
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async def assert_state(value: bool):
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global _state
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assert _state == value
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@pytest.mark.parametrize(
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'error_parent',
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[False, ValueError, KeyboardInterrupt],
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)
|
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@pytest.mark.parametrize(
|
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'callee_blocks_forever',
|
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[False, True],
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ids=lambda item: f'callee_blocks_forever={item}'
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)
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@pytest.mark.parametrize(
|
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'pointlessly_open_stream',
|
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[False, True],
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ids=lambda item: f'open_stream={item}'
|
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)
|
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def test_simple_context(
|
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error_parent,
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callee_blocks_forever,
|
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pointlessly_open_stream,
|
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):
|
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|
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timeout = 1.5 if not platform.system() == 'Windows' else 4
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|
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async def main():
|
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|
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with trio.fail_after(timeout):
|
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async with tractor.open_nursery() as nursery:
|
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|
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portal = await nursery.start_actor(
|
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'simple_context',
|
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enable_modules=[__name__],
|
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)
|
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|
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try:
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async with portal.open_context(
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simple_setup_teardown,
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data=10,
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block_forever=callee_blocks_forever,
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) as (ctx, sent):
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|
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assert sent == 11
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if callee_blocks_forever:
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await portal.run(assert_state, value=True)
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else:
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assert await ctx.result() == 'yo'
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if not error_parent:
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await ctx.cancel()
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if pointlessly_open_stream:
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async with ctx.open_stream():
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if error_parent:
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raise error_parent
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if callee_blocks_forever:
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await ctx.cancel()
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else:
|
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# in this case the stream will send a
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# 'stop' msg to the far end which needs
|
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# to be ignored
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pass
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else:
|
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if error_parent:
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raise error_parent
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finally:
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|
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# after cancellation
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if not error_parent:
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await portal.run(assert_state, value=False)
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# shut down daemon
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await portal.cancel_actor()
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if error_parent:
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try:
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trio.run(main)
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except error_parent:
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pass
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except trio.MultiError as me:
|
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# XXX: on windows it seems we may have to expect the group error
|
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from tractor._exceptions import is_multi_cancelled
|
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assert is_multi_cancelled(me)
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else:
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trio.run(main)
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|
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|
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# basic stream terminations:
|
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# - callee context closes without using stream
|
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# - caller context closes without using stream
|
||||
# - caller context calls `Context.cancel()` while streaming
|
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# is ongoing resulting in callee being cancelled
|
||||
# - callee calls `Context.cancel()` while streaming and caller
|
||||
# sees stream terminated in `RemoteActorError`
|
||||
|
||||
# TODO: future possible features
|
||||
# - restart request: far end raises `ContextRestart`
|
||||
|
||||
|
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@tractor.context
|
||||
async def close_ctx_immediately(
|
||||
|
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ctx: tractor.Context,
|
||||
|
||||
) -> None:
|
||||
|
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await ctx.started()
|
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global _state
|
||||
|
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async with ctx.open_stream():
|
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pass
|
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|
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|
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@tractor_test
|
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async def test_callee_closes_ctx_after_stream_open():
|
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'callee context closes without using stream'
|
||||
|
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async with tractor.open_nursery() as n:
|
||||
|
||||
portal = await n.start_actor(
|
||||
'fast_stream_closer',
|
||||
enable_modules=[__name__],
|
||||
)
|
||||
|
||||
async with portal.open_context(
|
||||
close_ctx_immediately,
|
||||
|
||||
# flag to avoid waiting the final result
|
||||
# cancel_on_exit=True,
|
||||
|
||||
) as (ctx, sent):
|
||||
|
||||
assert sent is None
|
||||
|
||||
with trio.fail_after(0.5):
|
||||
async with ctx.open_stream() as stream:
|
||||
|
||||
# should fall through since ``StopAsyncIteration``
|
||||
# should be raised through translation of
|
||||
# a ``trio.EndOfChannel`` by
|
||||
# ``trio.abc.ReceiveChannel.__anext__()``
|
||||
async for _ in stream:
|
||||
assert 0
|
||||
else:
|
||||
|
||||
# verify stream is now closed
|
||||
try:
|
||||
await stream.receive()
|
||||
except trio.EndOfChannel:
|
||||
pass
|
||||
|
||||
# TODO: should be just raise the closed resource err
|
||||
# directly here to enforce not allowing a re-open
|
||||
# of a stream to the context (at least until a time of
|
||||
# if/when we decide that's a good idea?)
|
||||
try:
|
||||
async with ctx.open_stream() as stream:
|
||||
pass
|
||||
except trio.ClosedResourceError:
|
||||
pass
|
||||
|
||||
await portal.cancel_actor()
|
||||
|
||||
|
||||
@tractor.context
|
||||
async def expect_cancelled(
|
||||
|
||||
ctx: tractor.Context,
|
||||
|
||||
) -> None:
|
||||
global _state
|
||||
_state = True
|
||||
|
||||
await ctx.started()
|
||||
|
||||
try:
|
||||
async with ctx.open_stream() as stream:
|
||||
async for msg in stream:
|
||||
await stream.send(msg) # echo server
|
||||
|
||||
except trio.Cancelled:
|
||||
# expected case
|
||||
_state = False
|
||||
raise
|
||||
|
||||
else:
|
||||
assert 0, "Wasn't cancelled!?"
|
||||
|
||||
|
||||
@pytest.mark.parametrize(
|
||||
'use_ctx_cancel_method',
|
||||
[False, True],
|
||||
)
|
||||
@tractor_test
|
||||
async def test_caller_closes_ctx_after_callee_opens_stream(
|
||||
use_ctx_cancel_method: bool,
|
||||
):
|
||||
'caller context closes without using stream'
|
||||
|
||||
async with tractor.open_nursery() as n:
|
||||
|
||||
portal = await n.start_actor(
|
||||
'ctx_cancelled',
|
||||
enable_modules=[__name__],
|
||||
)
|
||||
|
||||
async with portal.open_context(
|
||||
expect_cancelled,
|
||||
) as (ctx, sent):
|
||||
await portal.run(assert_state, value=True)
|
||||
|
||||
assert sent is None
|
||||
|
||||
# call cancel explicitly
|
||||
if use_ctx_cancel_method:
|
||||
|
||||
await ctx.cancel()
|
||||
|
||||
try:
|
||||
async with ctx.open_stream() as stream:
|
||||
async for msg in stream:
|
||||
pass
|
||||
|
||||
except tractor.ContextCancelled:
|
||||
raise # XXX: must be propagated to __aexit__
|
||||
|
||||
else:
|
||||
assert 0, "Should have context cancelled?"
|
||||
|
||||
# channel should still be up
|
||||
assert portal.channel.connected()
|
||||
|
||||
# ctx is closed here
|
||||
await portal.run(assert_state, value=False)
|
||||
|
||||
else:
|
||||
try:
|
||||
with trio.fail_after(0.2):
|
||||
await ctx.result()
|
||||
assert 0, "Callee should have blocked!?"
|
||||
except trio.TooSlowError:
|
||||
await ctx.cancel()
|
||||
try:
|
||||
async with ctx.open_stream() as stream:
|
||||
async for msg in stream:
|
||||
pass
|
||||
except tractor.ContextCancelled:
|
||||
pass
|
||||
else:
|
||||
assert 0, "Should have received closed resource error?"
|
||||
|
||||
# ctx is closed here
|
||||
await portal.run(assert_state, value=False)
|
||||
|
||||
# channel should not have been destroyed yet, only the
|
||||
# inter-actor-task context
|
||||
assert portal.channel.connected()
|
||||
|
||||
# teardown the actor
|
||||
await portal.cancel_actor()
|
||||
|
||||
|
||||
@tractor_test
|
||||
async def test_multitask_caller_cancels_from_nonroot_task():
|
||||
|
||||
async with tractor.open_nursery() as n:
|
||||
|
||||
portal = await n.start_actor(
|
||||
'ctx_cancelled',
|
||||
enable_modules=[__name__],
|
||||
)
|
||||
|
||||
async with portal.open_context(
|
||||
expect_cancelled,
|
||||
) as (ctx, sent):
|
||||
|
||||
await portal.run(assert_state, value=True)
|
||||
assert sent is None
|
||||
|
||||
async with ctx.open_stream() as stream:
|
||||
|
||||
async def send_msg_then_cancel():
|
||||
await stream.send('yo')
|
||||
await portal.run(assert_state, value=True)
|
||||
await ctx.cancel()
|
||||
await portal.run(assert_state, value=False)
|
||||
|
||||
async with trio.open_nursery() as n:
|
||||
n.start_soon(send_msg_then_cancel)
|
||||
|
||||
try:
|
||||
async for msg in stream:
|
||||
assert msg == 'yo'
|
||||
|
||||
except tractor.ContextCancelled:
|
||||
raise # XXX: must be propagated to __aexit__
|
||||
|
||||
# channel should still be up
|
||||
assert portal.channel.connected()
|
||||
|
||||
# ctx is closed here
|
||||
await portal.run(assert_state, value=False)
|
||||
|
||||
# channel should not have been destroyed yet, only the
|
||||
# inter-actor-task context
|
||||
assert portal.channel.connected()
|
||||
|
||||
# teardown the actor
|
||||
await portal.cancel_actor()
|
||||
|
||||
|
||||
@tractor.context
|
||||
async def cancel_self(
|
||||
|
||||
ctx: tractor.Context,
|
||||
|
||||
) -> None:
|
||||
global _state
|
||||
_state = True
|
||||
|
||||
await ctx.cancel()
|
||||
try:
|
||||
with trio.fail_after(0.1):
|
||||
await trio.sleep_forever()
|
||||
|
||||
except trio.Cancelled:
|
||||
raise
|
||||
|
||||
except trio.TooSlowError:
|
||||
# should never get here
|
||||
assert 0
|
||||
|
||||
|
||||
@tractor_test
|
||||
async def test_callee_cancels_before_started():
|
||||
'''
|
||||
Callee calls `Context.cancel()` while streaming and caller
|
||||
sees stream terminated in `ContextCancelled`.
|
||||
|
||||
'''
|
||||
async with tractor.open_nursery() as n:
|
||||
|
||||
portal = await n.start_actor(
|
||||
'cancels_self',
|
||||
enable_modules=[__name__],
|
||||
)
|
||||
try:
|
||||
|
||||
async with portal.open_context(
|
||||
cancel_self,
|
||||
) as (ctx, sent):
|
||||
async with ctx.open_stream():
|
||||
|
||||
await trio.sleep_forever()
|
||||
|
||||
# raises a special cancel signal
|
||||
except tractor.ContextCancelled as ce:
|
||||
ce.type == trio.Cancelled
|
||||
|
||||
# teardown the actor
|
||||
await portal.cancel_actor()
|
||||
|
||||
|
||||
@tractor.context
|
||||
async def really_started(
|
||||
|
|
@ -164,6 +570,7 @@ def test_one_end_stream_not_opened(overrun_by):
|
|||
else:
|
||||
trio.run(main)
|
||||
|
||||
|
||||
@tractor.context
|
||||
async def echo_back_sequence(
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue