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98 changes: 1 addition & 97 deletions google/colab/_debugpy.py
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Original file line number Diff line number Diff line change
@@ -1,101 +1,5 @@
"""Tools to enable debugpy attachment to a process."""

import sys
import threading
import time

import debugpy
from google.colab import _debugpy_repr
from google.colab import _variable_inspector
import IPython
import portpicker

_dap_port = None


def enable_attach_async(enable_inspector=False):
"""Enable a debugger to attach to this process.

Args:
enable_inspector: Enable variable inspector.

Returns:
The debug adapter port which can be connected to using the Debug Adapter
Proxy protocol.
"""
global _dap_port
if _dap_port:
return _dap_port

# Changes here should be reflected in our internal debugpy config.
debugpy.configure({
# We don't use qt, so we disable support to avoid spurious imports.
'qt': 'none',
# b/180567283: Disable monkey patching subprocess calls which isn't
# needed for Colab and can cause issues.
'subProcess': False,
})

# debugpy overrides python's `breakpoint()` hook; we restore the original
# hook, as it works fine with our stdin handling, and debugpy's hook hangs.
sys.breakpointhook = sys.__breakpointhook__

_dap_port = portpicker.pick_unused_port()

main_thread = threading.current_thread()
# Prevent debugpy from tracing the current thread.
main_thread.pydev_do_not_trace = True

def attachment_entry():
# The client will retry the connection a few times to avoid the inherent
# raciness of this.
debugpy.listen(_dap_port)

if enable_inspector:
_debugpy_repr.patch_debugpy_repr()

inspector_thread_started = threading.Event()

def inspector_thread():
inspector_thread_started.set()
shell = IPython.get_ipython()
if not shell:
return
_variable_inspector.run(shell, time)

# Need to start this thread after the debugpy.listen() call but before
# the undo_patch_thread_modules().
threading.Thread(
target=inspector_thread, name='_colab_inspector_thread', daemon=True
).start()
inspector_thread_started.wait()

# Debugger tracing isn't needed for just tracebacks, but if full debugging
# is needed then it needs to be re-enabled while debugging.
# We want to use `pydevd.stoptrace` but if this is called before we have
# connected to the debug adapter from the client then it'll send a
# terminate to the adapter and the adapter will auto-exit before we can
# connect to it. After the connection then it's OK to terminate since the
# adapter will not close while there are active connections.
threading.settrace(None) # for all future threads
try:
# Stop debugpy from tracing newly created threads.
from _pydev_bundle import pydev_monkey # pylint: disable=g-import-not-at-top

pydev_monkey.undo_patch_thread_modules()
except ModuleNotFoundError:
# _pydev_bundle may be vendored into either location.
from pydevd._pydev_bundle import pydev_monkey # pylint: disable=g-import-not-at-top

pydev_monkey.undo_patch_thread_modules()

# Clear the trace flag to allow fetching stack traces.
main_thread.pydev_do_not_trace = False

# debugpy.listen will spin up another process then start listening for
# connections from that process. This can take a second or so, but most of it
# is not by this process. Doing this on a separate thread reduces the impact
# on kernel initialization.
threading.Thread(target=attachment_entry).start()

return _dap_port
pass
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