Commit 9adadb5c authored by David Wilson's avatar David Wilson

issue #150: import stack.py hack as mitogen.debug

Usage:
  - insert a call to mitogen.debug() in the desired process
  - kill -USR2 that process
  - observe its controlling TTY produces thread stack dumps
parent df488237
# Copyright 2017, David Wilson
#
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# modification, are permitted provided that the following conditions are met:
#
# 1. Redistributions of source code must retain the above copyright notice,
# this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions and the following disclaimer in the documentation
# and/or other materials provided with the distribution.
#
# 3. Neither the name of the copyright holder nor the names of its contributors
# may be used to endorse or promote products derived from this software without
# specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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# POSSIBILITY OF SUCH DAMAGE.
"""
Basic signal handler for dumping thread stacks.
"""
import difflib
import os
import signal
import sys
import threading
import time
import traceback
_last = None
def format_stacks():
name_by_id = {
t.ident: t.name
for t in threading.enumerate()
}
l = ['', '']
for threadId, stack in sys._current_frames().items():
l += ["# PID %d ThreadID: (%s) %s; %r" % (
os.getpid(),
name_by_id.get(threadId, '<no name>'),
threadId,
stack,
)]
for filename, lineno, name, line in traceback.extract_stack(stack):
l += [
'File: "%s", line %d, in %s' % (
filename,
lineno,
name
)
]
if line:
l += [' ' + line.strip()]
l += ['']
l += ['', '']
return '\n'.join(l)
def _handler(*_):
global _last
s = format_stacks()
fp = open('/dev/tty', 'w', 1)
fp.write(s)
if _last:
fp.write('\n')
diff = list(difflib.unified_diff(
a=_last.splitlines(),
b=s.splitlines(),
fromfile='then',
tofile='now'
))
if diff:
fp.write('\n'.join(diff))
else:
fp.write('(no change since last time)\n')
_last = s
def install_handler():
signal.signal(signal.SIGUSR2, _handler)
def _thread_main():
while True:
time.sleep(7)
l = format_stacks()
open('/tmp/stack.%s.log' % (os.getpid(),), 'wb', 65535).write(l)
break
def dump_periodically():
th = threading.Thread(target=main)
th.setDaemon(True)
th.start()
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