forked from goodboy/tractor
Start a new `._testing.fault_simulation`
Since I needed the `break_ipc()` helper from the `examples/advanced_faults/ipc_failure_during_stream.py` used in the `test_advanced_faults` suite, might as well move it into a pkg-wide importable module. Also changed the default break method to be `socket_close` which just calls `Stream.socket.close()` underneath in `trio`. Also tweak that example to not keep sending after the stream has been broken since with new `trio` that will raise `ClosedResourceError` and in the wrapping test we generally speaking want to see a hang and then cancel via simulated user sent SIGINT/ctl-c.runtime_to_msgspec
Tyler Goodlet
parent
70ab60ce7c
commit
0fcd424d57
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@ -21,75 +21,12 @@ import trio
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import pytest
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async def break_ipc(
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stream: MsgStream,
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method: str|None = None,
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pre_close: bool = False,
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def_method: str = 'eof',
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) -> None:
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'''
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XXX: close the channel right after an error is raised
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purposely breaking the IPC transport to make sure the parent
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doesn't get stuck in debug or hang on the connection join.
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this more or less simulates an infinite msg-receive hang on
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the other end.
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'''
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# close channel via IPC prot msging before
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# any transport breakage
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if pre_close:
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await stream.aclose()
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method: str = method or def_method
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print(
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'#################################\n'
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'Simulating CHILD-side IPC BREAK!\n'
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f'method: {method}\n'
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f'pre `.aclose()`: {pre_close}\n'
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'#################################\n'
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)
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match method:
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case 'trans_aclose':
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await stream._ctx.chan.transport.stream.aclose()
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case 'eof':
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await stream._ctx.chan.transport.stream.send_eof()
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case 'msg':
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await stream._ctx.chan.send(None)
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# TODO: the actual real-world simulated cases like
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# transport layer hangs and/or lower layer 2-gens type
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# scenarios..
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#
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# -[ ] already have some issues for this general testing
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# area:
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# - https://github.com/goodboy/tractor/issues/97
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# - https://github.com/goodboy/tractor/issues/124
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# - PR from @guille:
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# https://github.com/goodboy/tractor/pull/149
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# case 'hang':
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# TODO: framework research:
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#
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# - https://github.com/GuoTengda1993/pynetem
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# - https://github.com/shopify/toxiproxy
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# - https://manpages.ubuntu.com/manpages/trusty/man1/wirefilter.1.html
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case _:
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raise RuntimeError(
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f'IPC break method unsupported: {method}'
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)
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async def break_ipc_then_error(
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stream: MsgStream,
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break_ipc_with: str|None = None,
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pre_close: bool = False,
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):
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await break_ipc(
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await _testing.break_ipc(
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stream=stream,
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method=break_ipc_with,
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pre_close=pre_close,
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@ -121,6 +58,7 @@ async def recv_and_spawn_net_killers(
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Receive stream msgs and spawn some IPC killers mid-stream.
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'''
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broke_ipc: bool = False
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await ctx.started()
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async with (
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ctx.open_stream() as stream,
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@ -128,13 +66,17 @@ async def recv_and_spawn_net_killers(
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):
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async for i in stream:
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print(f'child echoing {i}')
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if not broke_ipc:
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await stream.send(i)
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else:
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await trio.sleep(0.01)
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if (
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break_ipc_after
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and
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i >= break_ipc_after
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):
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broke_ipc = True
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n.start_soon(
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iter_ipc_stream,
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stream,
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@ -242,14 +184,13 @@ async def main(
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# await stream._ctx.chan.send(None)
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# await stream._ctx.chan.transport.stream.send_eof()
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await stream._ctx.chan.transport.stream.aclose()
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ipc_break_sent = True
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# it actually breaks right here in the
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# mp_spawn/forkserver backends and thus the zombie
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# reaper never even kicks in?
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print(f'parent sending {i}')
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# mp_spawn/forkserver backends and thus the
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# zombie reaper never even kicks in?
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try:
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print(f'parent sending {i}')
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await stream.send(i)
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except ContextCancelled as ctxc:
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print(
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@ -262,6 +203,13 @@ async def main(
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# TODO: is this needed or no?
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raise
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except trio.ClosedResourceError:
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# NOTE: don't send if we already broke the
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# connection to avoid raising a closed-error
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# such that we drop through to the ctl-c
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# mashing by user.
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await trio.sleep(0.01)
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# timeout: int = 1
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# with trio.move_on_after(timeout) as cs:
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async with stuff_hangin_ctlc() as timeout:
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@ -26,6 +26,9 @@ import tractor
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from .pytest import (
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tractor_test as tractor_test
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)
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from .fault_simulation import (
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break_ipc as break_ipc,
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)
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def repodir() -> pathlib.Path:
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@ -0,0 +1,92 @@
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# tractor: structured concurrent "actors".
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# Copyright 2018-eternity Tyler Goodlet.
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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'''
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`pytest` utils helpers and plugins for testing `tractor`'s runtime
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and applications.
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'''
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from tractor import (
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MsgStream,
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)
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async def break_ipc(
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stream: MsgStream,
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method: str|None = None,
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pre_close: bool = False,
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def_method: str = 'socket_close',
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) -> None:
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'''
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XXX: close the channel right after an error is raised
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purposely breaking the IPC transport to make sure the parent
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doesn't get stuck in debug or hang on the connection join.
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this more or less simulates an infinite msg-receive hang on
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the other end.
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'''
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# close channel via IPC prot msging before
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# any transport breakage
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if pre_close:
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await stream.aclose()
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method: str = method or def_method
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print(
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'#################################\n'
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'Simulating CHILD-side IPC BREAK!\n'
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f'method: {method}\n'
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f'pre `.aclose()`: {pre_close}\n'
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'#################################\n'
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)
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match method:
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case 'socket_close':
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await stream._ctx.chan.transport.stream.aclose()
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case 'socket_eof':
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# NOTE: `trio` does the following underneath this
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# call in `src/trio/_highlevel_socket.py`:
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# `Stream.socket.shutdown(tsocket.SHUT_WR)`
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await stream._ctx.chan.transport.stream.send_eof()
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# TODO: remove since now this will be invalid with our
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# new typed msg spec?
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# case 'msg':
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# await stream._ctx.chan.send(None)
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# TODO: the actual real-world simulated cases like
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# transport layer hangs and/or lower layer 2-gens type
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# scenarios..
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#
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# -[ ] already have some issues for this general testing
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# area:
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# - https://github.com/goodboy/tractor/issues/97
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# - https://github.com/goodboy/tractor/issues/124
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# - PR from @guille:
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# https://github.com/goodboy/tractor/pull/149
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# case 'hang':
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# TODO: framework research:
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#
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# - https://github.com/GuoTengda1993/pynetem
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# - https://github.com/shopify/toxiproxy
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# - https://manpages.ubuntu.com/manpages/trusty/man1/wirefilter.1.html
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case _:
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raise RuntimeError(
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f'IPC break method unsupported: {method}'
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)
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