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"""
Extensions for debugging Scrapy
See documentation in docs/topics/extensions.rst
"""
import signal
import traceback
from pdb import Pdb
class StackTraceDump(object):
def __init__(self):
try:
signal.signal(signal.SIGUSR2, self.dump_stacktrace)
except AttributeError:
# win32 platforms don't support SIGUSR signals
pass
def dump_stacktrace(self, signum, frame):
print "Got signal. Dumping stack trace..."
traceback.print_stack(frame)
class Debugger(object):
def __init__(self):
try:
signal.signal(signal.SIGUSR2, self._enter_debugger)
except AttributeError:
# win32 platforms don't support SIGUSR signals
pass
def _enter_debugger(self, signum, frame):
Pdb().set_trace(frame.f_back)
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