forked from goodboy/tractor
Officially test proto-ed `stackscope` integration
By re-purposing our `pexpect`-based console matching with a new `debugging/shield_hang_in_sub.py` example, this tests a few "hanging actor" conditions more formally: - that despite a hanging actor's task we can dump a `stackscope.extract()` tree on relay of `SIGUSR1`. - the actor tree will terminate despite a shielded forever-sleep by our "T-800" zombie reaper machinery activating and hard killing the underlying subprocess. Some test deats: - simulates the expect actions of a real user by manually using `os.kill()` to send both signals to the actor-tree program. - `pexpect`-matches against `log.devx()` emissions under normal `debug_mode == True` usage. - ensure we get the actual "T-800 deployed" `log.error()` msg and that the actor tree eventually terminates! Surrounding (re-org/impl/test-suite) changes: - allow disabling usage via a `maybe_enable_greenback: bool` to `open_root_actor()` but enable by def. - pretty up the actual `.devx()` content from `.devx._stackscope` including be extra pedantic about the conc-primitives for each signal event. - try to avoid double handles of `SIGUSR1` even though it seems the original (what i thought was a) problem was actually just double logging in the handler.. |_ avoid double applying the handler func via `signal.signal()`, |_ use a global to avoid double handle func calls and, |_ a `threading.RLock` around handling. - move common fixtures and helper routines from `test_debugger` to `tests/devx/conftest.py` and import them for use in both test mods.aio_abandons
Tyler Goodlet
parent
d216068713
commit
a628eabb30
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@ -0,0 +1,81 @@
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'''
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Verify we can dump a `stackscope` tree on a hang.
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'''
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import os
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import signal
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import trio
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import tractor
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@tractor.context
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async def start_n_shield_hang(
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ctx: tractor.Context,
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):
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# actor: tractor.Actor = tractor.current_actor()
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# sync to parent-side task
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await ctx.started(os.getpid())
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print('Entering shield sleep..')
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with trio.CancelScope(shield=True):
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await trio.sleep_forever() # in subactor
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# XXX NOTE ^^^ since this shields, we expect
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# the zombie reaper (aka T800) to engage on
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# SIGINT from the user and eventually hard-kill
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# this subprocess!
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async def main(
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from_test: bool = False,
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) -> None:
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async with (
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tractor.open_nursery(
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debug_mode=True,
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enable_stack_on_sig=True,
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# maybe_enable_greenback=False,
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loglevel='devx',
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) as an,
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):
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ptl: tractor.Portal = await an.start_actor(
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'hanger',
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enable_modules=[__name__],
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debug_mode=True,
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)
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async with ptl.open_context(
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start_n_shield_hang,
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) as (ctx, cpid):
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_, proc, _ = an._children[ptl.chan.uid]
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assert cpid == proc.pid
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print(
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'Yo my child hanging..?\n'
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'Sending SIGUSR1 to see a tree-trace!\n'
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)
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# XXX simulate the wrapping test's "user actions"
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# (i.e. if a human didn't run this manually but wants to
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# know what they should do to reproduce test behaviour)
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if from_test:
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os.kill(
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cpid,
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signal.SIGUSR1,
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)
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# simulate user cancelling program
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await trio.sleep(0.5)
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os.kill(
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os.getpid(),
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signal.SIGINT,
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)
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else:
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# actually let user send the ctl-c
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await trio.sleep_forever() # in root
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if __name__ == '__main__':
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trio.run(main)
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@ -0,0 +1,167 @@
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'''
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`tractor.devx.*` tooling sub-pkg test space.
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'''
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from typing import (
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Callable,
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)
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import pytest
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from pexpect.exceptions import (
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TIMEOUT,
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)
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from tractor._testing import (
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mk_cmd,
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)
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@pytest.fixture
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def spawn(
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start_method,
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testdir: pytest.Testdir,
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reg_addr: tuple[str, int],
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) -> Callable[[str], None]:
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'''
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Use the `pexpect` module shipped via `testdir.spawn()` to
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run an `./examples/..` script by name.
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'''
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if start_method != 'trio':
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pytest.skip(
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'`pexpect` based tests only supported on `trio` backend'
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)
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def _spawn(
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cmd: str,
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**mkcmd_kwargs,
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):
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return testdir.spawn(
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cmd=mk_cmd(
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cmd,
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**mkcmd_kwargs,
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),
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expect_timeout=3,
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)
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# such that test-dep can pass input script name.
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return _spawn
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@pytest.fixture(
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params=[False, True],
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ids='ctl-c={}'.format,
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)
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def ctlc(
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request,
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ci_env: bool,
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) -> bool:
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use_ctlc = request.param
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node = request.node
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markers = node.own_markers
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for mark in markers:
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if mark.name == 'has_nested_actors':
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pytest.skip(
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f'Test {node} has nested actors and fails with Ctrl-C.\n'
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f'The test can sometimes run fine locally but until'
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' we solve' 'this issue this CI test will be xfail:\n'
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'https://github.com/goodboy/tractor/issues/320'
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)
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if use_ctlc:
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# XXX: disable pygments highlighting for auto-tests
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# since some envs (like actions CI) will struggle
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# the the added color-char encoding..
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from tractor.devx._debug import TractorConfig
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TractorConfig.use_pygements = False
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yield use_ctlc
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def expect(
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child,
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# normally a `pdb` prompt by default
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patt: str,
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**kwargs,
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) -> None:
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'''
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Expect wrapper that prints last seen console
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data before failing.
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'''
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try:
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child.expect(
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patt,
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**kwargs,
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)
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except TIMEOUT:
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before = str(child.before.decode())
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print(before)
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raise
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def in_prompt_msg(
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prompt: str,
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parts: list[str],
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pause_on_false: bool = False,
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err_on_false: bool = False,
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print_prompt_on_false: bool = True,
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) -> bool:
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'''
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Predicate check if (the prompt's) std-streams output has all
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`str`-parts in it.
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Can be used in test asserts for bulk matching expected
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log/REPL output for a given `pdb` interact point.
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'''
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__tracebackhide__: bool = False
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for part in parts:
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if part not in prompt:
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if pause_on_false:
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import pdbp
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pdbp.set_trace()
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if print_prompt_on_false:
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print(prompt)
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if err_on_false:
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raise ValueError(
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f'Could not find pattern: {part!r} in `before` output?'
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)
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return False
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return True
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# TODO: todo support terminal color-chars stripping so we can match
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# against call stack frame output from the the 'll' command the like!
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# -[ ] SO answer for stipping ANSI codes: https://stackoverflow.com/a/14693789
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def assert_before(
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child,
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patts: list[str],
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**kwargs,
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) -> None:
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__tracebackhide__: bool = False
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# as in before the prompt end
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before: str = str(child.before.decode())
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assert in_prompt_msg(
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prompt=before,
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parts=patts,
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# since this is an "assert" helper ;)
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err_on_false=True,
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**kwargs
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)
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@ -16,7 +16,6 @@ import platform
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import time
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import pytest
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import pexpect
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from pexpect.exceptions import (
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TIMEOUT,
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EOF,
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@ -27,12 +26,14 @@ from tractor.devx._debug import (
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_crash_msg,
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_repl_fail_msg,
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)
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from tractor._testing import (
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mk_cmd,
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)
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from conftest import (
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_ci_env,
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)
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from .conftest import (
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expect,
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in_prompt_msg,
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assert_before,
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)
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# TODO: The next great debugger audit could be done by you!
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# - recurrent entry to breakpoint() from single actor *after* and an
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@ -69,154 +70,9 @@ has_nested_actors = pytest.mark.has_nested_actors
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# )
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@pytest.fixture
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def spawn(
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start_method,
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testdir,
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reg_addr,
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) -> 'pexpect.spawn':
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'''
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Use the `pexpect` module shipped via `testdir.spawn()` to
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run an `./examples/..` script by name.
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'''
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if start_method != 'trio':
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pytest.skip(
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'`pexpect` based tests only supported on `trio` backend'
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)
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def _spawn(
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cmd: str,
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**mkcmd_kwargs,
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):
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return testdir.spawn(
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cmd=mk_cmd(
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cmd,
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**mkcmd_kwargs,
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),
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expect_timeout=3,
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)
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# such that test-dep can pass input script name.
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return _spawn
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PROMPT = r"\(Pdb\+\)"
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def expect(
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child,
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# prompt by default
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patt: str = PROMPT,
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**kwargs,
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) -> None:
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'''
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Expect wrapper that prints last seen console
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data before failing.
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'''
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try:
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child.expect(
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patt,
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**kwargs,
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)
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except TIMEOUT:
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before = str(child.before.decode())
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print(before)
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raise
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def in_prompt_msg(
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prompt: str,
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parts: list[str],
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pause_on_false: bool = False,
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print_prompt_on_false: bool = True,
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) -> bool:
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'''
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Predicate check if (the prompt's) std-streams output has all
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`str`-parts in it.
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Can be used in test asserts for bulk matching expected
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log/REPL output for a given `pdb` interact point.
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'''
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__tracebackhide__: bool = False
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for part in parts:
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if part not in prompt:
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if pause_on_false:
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import pdbp
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pdbp.set_trace()
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if print_prompt_on_false:
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print(prompt)
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return False
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return True
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# TODO: todo support terminal color-chars stripping so we can match
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# against call stack frame output from the the 'll' command the like!
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# -[ ] SO answer for stipping ANSI codes: https://stackoverflow.com/a/14693789
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def assert_before(
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child,
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patts: list[str],
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**kwargs,
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) -> None:
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__tracebackhide__: bool = False
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# as in before the prompt end
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before: str = str(child.before.decode())
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assert in_prompt_msg(
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prompt=before,
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parts=patts,
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**kwargs
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)
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|
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@pytest.fixture(
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params=[False, True],
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ids='ctl-c={}'.format,
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)
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def ctlc(
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request,
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ci_env: bool,
|
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|
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) -> bool:
|
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|
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use_ctlc = request.param
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|
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node = request.node
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markers = node.own_markers
|
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for mark in markers:
|
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if mark.name == 'has_nested_actors':
|
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pytest.skip(
|
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f'Test {node} has nested actors and fails with Ctrl-C.\n'
|
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f'The test can sometimes run fine locally but until'
|
||||
' we solve' 'this issue this CI test will be xfail:\n'
|
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'https://github.com/goodboy/tractor/issues/320'
|
||||
)
|
||||
|
||||
if use_ctlc:
|
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# XXX: disable pygments highlighting for auto-tests
|
||||
# since some envs (like actions CI) will struggle
|
||||
# the the added color-char encoding..
|
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from tractor.devx._debug import TractorConfig
|
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TractorConfig.use_pygements = False
|
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|
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yield use_ctlc
|
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|
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|
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@pytest.mark.parametrize(
|
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'user_in_out',
|
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[
|
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|
|
@ -281,7 +137,7 @@ def test_root_actor_bp(spawn, user_in_out):
|
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child.expect('\r\n')
|
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|
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# process should exit
|
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child.expect(pexpect.EOF)
|
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child.expect(EOF)
|
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|
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if expect_err_str is None:
|
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assert 'Error' not in str(child.before)
|
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|
|
@ -365,7 +221,7 @@ def test_root_actor_bp_forever(
|
|||
|
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# quit out of the loop
|
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child.sendline('q')
|
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child.expect(pexpect.EOF)
|
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child.expect(EOF)
|
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|
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|
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@pytest.mark.parametrize(
|
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|
|
@ -430,7 +286,7 @@ def test_subactor_error(
|
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child.expect('\r\n')
|
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|
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# process should exit
|
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child.expect(pexpect.EOF)
|
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child.expect(EOF)
|
||||
|
||||
|
||||
def test_subactor_breakpoint(
|
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|
|
@ -493,7 +349,7 @@ def test_subactor_breakpoint(
|
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child.sendline('c')
|
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|
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# process should exit
|
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child.expect(pexpect.EOF)
|
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child.expect(EOF)
|
||||
|
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before = str(child.before.decode())
|
||||
assert in_prompt_msg(
|
||||
|
|
@ -636,7 +492,7 @@ def test_multi_subactors(
|
|||
|
||||
# process should exit
|
||||
child.sendline('c')
|
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child.expect(pexpect.EOF)
|
||||
child.expect(EOF)
|
||||
|
||||
# repeat of previous multierror for final output
|
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assert_before(child, [
|
||||
|
|
@ -776,7 +632,7 @@ def test_multi_daemon_subactors(
|
|||
)
|
||||
|
||||
child.sendline('c')
|
||||
child.expect(pexpect.EOF)
|
||||
child.expect(EOF)
|
||||
|
||||
|
||||
@has_nested_actors
|
||||
|
|
@ -852,7 +708,7 @@ def test_multi_subactors_root_errors(
|
|||
])
|
||||
|
||||
child.sendline('c')
|
||||
child.expect(pexpect.EOF)
|
||||
child.expect(EOF)
|
||||
|
||||
assert_before(child, [
|
||||
# "Attaching to pdb in crashed actor: ('root'",
|
||||
|
|
@ -982,7 +838,7 @@ def test_root_nursery_cancels_before_child_releases_tty_lock(
|
|||
|
||||
for i in range(3):
|
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try:
|
||||
child.expect(pexpect.EOF, timeout=0.5)
|
||||
child.expect(EOF, timeout=0.5)
|
||||
break
|
||||
except TIMEOUT:
|
||||
child.sendline('c')
|
||||
|
|
@ -1024,7 +880,7 @@ def test_root_cancels_child_context_during_startup(
|
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do_ctlc(child)
|
||||
|
||||
child.sendline('c')
|
||||
child.expect(pexpect.EOF)
|
||||
child.expect(EOF)
|
||||
|
||||
|
||||
def test_different_debug_mode_per_actor(
|
||||
|
|
@ -1045,7 +901,7 @@ def test_different_debug_mode_per_actor(
|
|||
do_ctlc(child)
|
||||
|
||||
child.sendline('c')
|
||||
child.expect(pexpect.EOF)
|
||||
child.expect(EOF)
|
||||
|
||||
before = str(child.before.decode())
|
||||
|
||||
|
|
@ -1196,7 +1052,7 @@ def test_pause_from_sync(
|
|||
)
|
||||
|
||||
child.sendline('c')
|
||||
child.expect(pexpect.EOF)
|
||||
child.expect(EOF)
|
||||
|
||||
|
||||
def test_post_mortem_api(
|
||||
|
|
@ -1301,7 +1157,7 @@ def test_post_mortem_api(
|
|||
# )
|
||||
|
||||
child.sendline('c')
|
||||
child.expect(pexpect.EOF)
|
||||
child.expect(EOF)
|
||||
|
||||
|
||||
def test_shield_pause(
|
||||
|
|
@ -1376,7 +1232,7 @@ def test_shield_pause(
|
|||
]
|
||||
)
|
||||
child.sendline('c')
|
||||
child.expect(pexpect.EOF)
|
||||
child.expect(EOF)
|
||||
|
||||
|
||||
# TODO: better error for "non-ideal" usage from the root actor.
|
||||
|
|
|
|||
|
|
@ -0,0 +1,120 @@
|
|||
'''
|
||||
That "native" runtime-hackin toolset better be dang useful!
|
||||
|
||||
Verify the funtion of a variety of "developer-experience" tools we
|
||||
offer from the `.devx` sub-pkg:
|
||||
|
||||
- use of the lovely `stackscope` for dumping actor `trio`-task trees
|
||||
during operation and hangs.
|
||||
|
||||
TODO:
|
||||
- demonstration of `CallerInfo` call stack frame filtering such that
|
||||
for logging and REPL purposes a user sees exactly the layers needed
|
||||
when debugging a problem inside the stack vs. in their app.
|
||||
|
||||
'''
|
||||
import os
|
||||
import signal
|
||||
|
||||
from .conftest import (
|
||||
expect,
|
||||
assert_before,
|
||||
# in_prompt_msg,
|
||||
)
|
||||
|
||||
|
||||
def test_shield_pause(
|
||||
spawn,
|
||||
):
|
||||
'''
|
||||
Verify the `tractor.pause()/.post_mortem()` API works inside an
|
||||
already cancelled `trio.CancelScope` and that you can step to the
|
||||
next checkpoint wherein the cancelled will get raised.
|
||||
|
||||
'''
|
||||
child = spawn(
|
||||
'shield_hang_in_sub'
|
||||
)
|
||||
expect(
|
||||
child,
|
||||
'Yo my child hanging..?',
|
||||
)
|
||||
assert_before(
|
||||
child,
|
||||
[
|
||||
'Entering shield sleep..',
|
||||
'Enabling trace-trees on `SIGUSR1` since `stackscope` is installed @',
|
||||
]
|
||||
)
|
||||
|
||||
print(
|
||||
'Sending SIGUSR1 to see a tree-trace!',
|
||||
)
|
||||
os.kill(
|
||||
child.pid,
|
||||
signal.SIGUSR1,
|
||||
)
|
||||
expect(
|
||||
child,
|
||||
# end-of-tree delimiter
|
||||
"------ \('root', ",
|
||||
)
|
||||
|
||||
assert_before(
|
||||
child,
|
||||
[
|
||||
'Trying to dump `stackscope` tree..',
|
||||
'Dumping `stackscope` tree for actor',
|
||||
"('root'", # uid line
|
||||
|
||||
# parent block point (non-shielded)
|
||||
'await trio.sleep_forever() # in root',
|
||||
]
|
||||
)
|
||||
|
||||
# expect(
|
||||
# child,
|
||||
# # relay to the sub should be reported
|
||||
# 'Relaying `SIGUSR1`[10] to sub-actor',
|
||||
# )
|
||||
|
||||
expect(
|
||||
child,
|
||||
# end-of-tree delimiter
|
||||
"------ \('hanger', ",
|
||||
)
|
||||
assert_before(
|
||||
child,
|
||||
[
|
||||
# relay to the sub should be reported
|
||||
'Relaying `SIGUSR1`[10] to sub-actor',
|
||||
|
||||
"('hanger'", # uid line
|
||||
|
||||
# hanger LOC where it's shield-halted
|
||||
'await trio.sleep_forever() # in subactor',
|
||||
]
|
||||
)
|
||||
# breakpoint()
|
||||
|
||||
# simulate the user sending a ctl-c to the hanging program.
|
||||
# this should result in the terminator kicking in since
|
||||
# the sub is shield blocking and can't respond to SIGINT.
|
||||
os.kill(
|
||||
child.pid,
|
||||
signal.SIGINT,
|
||||
)
|
||||
expect(
|
||||
child,
|
||||
'Shutting down actor runtime',
|
||||
timeout=6,
|
||||
)
|
||||
assert_before(
|
||||
child,
|
||||
[
|
||||
'raise KeyboardInterrupt',
|
||||
# 'Shutting down actor runtime',
|
||||
'#T-800 deployed to collect zombie B0',
|
||||
"'--uid', \"('hanger',",
|
||||
]
|
||||
)
|
||||
|
|
@ -80,7 +80,7 @@ async def open_root_actor(
|
|||
|
||||
# enables the multi-process debugger support
|
||||
debug_mode: bool = False,
|
||||
maybe_enable_greenback: bool = False, # `.pause_from_sync()/breakpoint()` support
|
||||
maybe_enable_greenback: bool = True, # `.pause_from_sync()/breakpoint()` support
|
||||
enable_stack_on_sig: bool = False,
|
||||
|
||||
# internal logging
|
||||
|
|
@ -233,14 +233,8 @@ async def open_root_actor(
|
|||
and
|
||||
enable_stack_on_sig
|
||||
):
|
||||
try:
|
||||
logger.info('Enabling `stackscope` traces on SIGUSR1')
|
||||
from .devx import enable_stack_on_sig
|
||||
from .devx._stackscope import enable_stack_on_sig
|
||||
enable_stack_on_sig()
|
||||
except ImportError:
|
||||
logger.warning(
|
||||
'`stackscope` not installed for use in debug mode!'
|
||||
)
|
||||
|
||||
# closed into below ping task-func
|
||||
ponged_addrs: list[tuple[str, int]] = []
|
||||
|
|
|
|||
|
|
@ -24,13 +24,24 @@ disjoint, parallel executing tasks in separate actors.
|
|||
|
||||
'''
|
||||
from __future__ import annotations
|
||||
# from functools import partial
|
||||
from threading import (
|
||||
current_thread,
|
||||
Thread,
|
||||
RLock,
|
||||
)
|
||||
import multiprocessing as mp
|
||||
from signal import (
|
||||
signal,
|
||||
getsignal,
|
||||
SIGUSR1,
|
||||
)
|
||||
import traceback
|
||||
from typing import TYPE_CHECKING
|
||||
# import traceback
|
||||
from types import ModuleType
|
||||
from typing import (
|
||||
Callable,
|
||||
TYPE_CHECKING,
|
||||
)
|
||||
|
||||
import trio
|
||||
from tractor import (
|
||||
|
|
@ -51,26 +62,45 @@ if TYPE_CHECKING:
|
|||
|
||||
@trio.lowlevel.disable_ki_protection
|
||||
def dump_task_tree() -> None:
|
||||
import stackscope
|
||||
from tractor.log import get_console_log
|
||||
'''
|
||||
Do a classic `stackscope.extract()` task-tree dump to console at
|
||||
`.devx()` level.
|
||||
|
||||
'''
|
||||
import stackscope
|
||||
tree_str: str = str(
|
||||
stackscope.extract(
|
||||
trio.lowlevel.current_root_task(),
|
||||
recurse_child_tasks=True
|
||||
)
|
||||
)
|
||||
log = get_console_log(
|
||||
name=__name__,
|
||||
level='cancel',
|
||||
)
|
||||
actor: Actor = _state.current_actor()
|
||||
thr: Thread = current_thread()
|
||||
log.devx(
|
||||
f'Dumping `stackscope` tree for actor\n'
|
||||
f'{actor.name}: {actor}\n'
|
||||
f' |_{mp.current_process()}\n\n'
|
||||
f'{actor.uid}:\n'
|
||||
f'|_{mp.current_process()}\n'
|
||||
f' |_{thr}\n'
|
||||
f' |_{actor}\n\n'
|
||||
|
||||
# start-of-trace-tree delimiter (mostly for testing)
|
||||
'------ - ------\n'
|
||||
'\n'
|
||||
+
|
||||
f'{tree_str}\n'
|
||||
+
|
||||
# end-of-trace-tree delimiter (mostly for testing)
|
||||
f'\n'
|
||||
f'------ {actor.uid!r} ------\n'
|
||||
)
|
||||
# TODO: can remove this right?
|
||||
# -[ ] was original code from author
|
||||
#
|
||||
# print(
|
||||
# 'DUMPING FROM PRINT\n'
|
||||
# +
|
||||
# content
|
||||
# )
|
||||
# import logging
|
||||
# try:
|
||||
# with open("/dev/tty", "w") as tty:
|
||||
|
|
@ -80,58 +110,130 @@ def dump_task_tree() -> None:
|
|||
# "task_tree"
|
||||
# ).exception("Error printing task tree")
|
||||
|
||||
_handler_lock = RLock()
|
||||
_tree_dumped: bool = False
|
||||
|
||||
def signal_handler(
|
||||
|
||||
def dump_tree_on_sig(
|
||||
sig: int,
|
||||
frame: object,
|
||||
|
||||
relay_to_subs: bool = True,
|
||||
|
||||
) -> None:
|
||||
global _tree_dumped, _handler_lock
|
||||
with _handler_lock:
|
||||
if _tree_dumped:
|
||||
log.warning(
|
||||
'Already dumped for this actor...??'
|
||||
)
|
||||
return
|
||||
|
||||
_tree_dumped = True
|
||||
|
||||
# actor: Actor = _state.current_actor()
|
||||
log.devx(
|
||||
'Trying to dump `stackscope` tree..\n'
|
||||
)
|
||||
try:
|
||||
trio.lowlevel.current_trio_token(
|
||||
).run_sync_soon(dump_task_tree)
|
||||
dump_task_tree()
|
||||
# await actor._service_n.start_soon(
|
||||
# partial(
|
||||
# trio.to_thread.run_sync,
|
||||
# dump_task_tree,
|
||||
# )
|
||||
# )
|
||||
# trio.lowlevel.current_trio_token().run_sync_soon(
|
||||
# dump_task_tree
|
||||
# )
|
||||
|
||||
except RuntimeError:
|
||||
log.exception(
|
||||
'Failed to dump `stackscope` tree..\n'
|
||||
)
|
||||
# not in async context -- print a normal traceback
|
||||
traceback.print_stack()
|
||||
# traceback.print_stack()
|
||||
raise
|
||||
|
||||
except BaseException:
|
||||
log.exception(
|
||||
'Failed to dump `stackscope` tree..\n'
|
||||
)
|
||||
raise
|
||||
|
||||
log.devx(
|
||||
'Supposedly we dumped just fine..?'
|
||||
)
|
||||
|
||||
if not relay_to_subs:
|
||||
return
|
||||
|
||||
an: ActorNursery
|
||||
for an in _state.current_actor()._actoruid2nursery.values():
|
||||
|
||||
subproc: ProcessType
|
||||
subactor: Actor
|
||||
for subactor, subproc, _ in an._children.values():
|
||||
log.devx(
|
||||
log.warning(
|
||||
f'Relaying `SIGUSR1`[{sig}] to sub-actor\n'
|
||||
f'{subactor}\n'
|
||||
f' |_{subproc}\n'
|
||||
)
|
||||
|
||||
if isinstance(subproc, trio.Process):
|
||||
# bc of course stdlib can't have a std API.. XD
|
||||
match subproc:
|
||||
case trio.Process():
|
||||
subproc.send_signal(sig)
|
||||
|
||||
elif isinstance(subproc, mp.Process):
|
||||
case mp.Process():
|
||||
subproc._send_signal(sig)
|
||||
|
||||
|
||||
def enable_stack_on_sig(
|
||||
sig: int = SIGUSR1
|
||||
) -> None:
|
||||
sig: int = SIGUSR1,
|
||||
) -> ModuleType:
|
||||
'''
|
||||
Enable `stackscope` tracing on reception of a signal; by
|
||||
default this is SIGUSR1.
|
||||
|
||||
HOT TIP: a task/ctx-tree dump can be triggered from a shell with
|
||||
fancy cmds.
|
||||
|
||||
For ex. from `bash` using `pgrep` and cmd-sustitution
|
||||
(https://www.gnu.org/software/bash/manual/bash.html#Command-Substitution)
|
||||
you could use:
|
||||
|
||||
>> kill -SIGUSR1 $(pgrep -f '<cmd>')
|
||||
|
||||
Or with with `xonsh` (which has diff capture-from-subproc syntax)
|
||||
|
||||
>> kill -SIGUSR1 @$(pgrep -f '<cmd>')
|
||||
|
||||
'''
|
||||
try:
|
||||
import stackscope
|
||||
except ImportError:
|
||||
log.warning(
|
||||
'`stackscope` not installed for use in debug mode!'
|
||||
)
|
||||
return None
|
||||
|
||||
handler: Callable|int = getsignal(sig)
|
||||
if handler is dump_tree_on_sig:
|
||||
log.devx(
|
||||
'A `SIGUSR1` handler already exists?\n'
|
||||
f'|_ {handler!r}\n'
|
||||
)
|
||||
return
|
||||
|
||||
signal(
|
||||
sig,
|
||||
signal_handler,
|
||||
dump_tree_on_sig,
|
||||
)
|
||||
# NOTE: not the above can be triggered from
|
||||
# a (xonsh) shell using:
|
||||
# kill -SIGUSR1 @$(pgrep -f '<cmd>')
|
||||
#
|
||||
# for example if you were looking to trace a `pytest` run
|
||||
# kill -SIGUSR1 @$(pgrep -f 'pytest')
|
||||
log.devx(
|
||||
'Enabling trace-trees on `SIGUSR1` '
|
||||
'since `stackscope` is installed @ \n'
|
||||
f'{stackscope!r}\n\n'
|
||||
f'With `SIGUSR1` handler\n'
|
||||
f'|_{dump_tree_on_sig}\n'
|
||||
)
|
||||
return stackscope
|
||||
|
|
|
|||
Loading…
Reference in New Issue