forked from goodboy/tractor
93 lines
3.0 KiB
Python
93 lines
3.0 KiB
Python
# 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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