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4a4664d268
Since mypy and typeshed have advanced a lot over the last several months, we no longer need these `type: ignore` annotations.
35 lines
1.2 KiB
Python
35 lines
1.2 KiB
Python
from __future__ import absolute_import
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import code
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import traceback
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import signal
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from types import FrameType
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from typing import Optional
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# Interactive debugging code from
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# http://stackoverflow.com/questions/132058/showing-the-stack-trace-from-a-running-python-application
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# (that link also points to code for an interactive remote debugger
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# setup, which we might want if we move Tornado to run in a daemon
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# rather than via screen).
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def interactive_debug(sig, frame):
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# type: (int, Optional[FrameType]) -> None
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"""Interrupt running process, and provide a python prompt for
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interactive debugging."""
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d = {'_frame': frame} # Allow access to frame object.
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d.update(frame.f_globals) # Unless shadowed by global
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d.update(frame.f_locals)
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message = "Signal recieved : entering python shell.\nTraceback:\n"
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message += ''.join(traceback.format_stack(frame))
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i = code.InteractiveConsole(d)
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i.interact(message)
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# SIGUSR1 => Just print the stack
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# SIGUSR2 => Print stack + open interactive debugging shell
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def interactive_debug_listen():
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# type: () -> None
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signal.signal(signal.SIGUSR1, lambda sig, stack: traceback.print_stack(stack))
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signal.signal(signal.SIGUSR2, interactive_debug)
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