scrapy.extensions.debug 源代码

"""
Extensions for debugging Scrapy

See documentation in docs/topics/extensions.rst
"""

import sys
import signal
import logging
import traceback
import threading
from pdb import Pdb

from scrapy.utils.engine import format_engine_status
from scrapy.utils.trackref import format_live_refs

logger = logging.getLogger(__name__)


[文档]class StackTraceDump: def __init__(self, crawler=None): self.crawler = crawler try: signal.signal(signal.SIGUSR2, self.dump_stacktrace) signal.signal(signal.SIGQUIT, self.dump_stacktrace) except AttributeError: # win32 platforms don't support SIGUSR signals pass @classmethod def from_crawler(cls, crawler): return cls(crawler) def dump_stacktrace(self, signum, frame): log_args = { 'stackdumps': self._thread_stacks(), 'enginestatus': format_engine_status(self.crawler.engine), 'liverefs': format_live_refs(), } logger.info("Dumping stack trace and engine status\n" "%(enginestatus)s\n%(liverefs)s\n%(stackdumps)s", log_args, extra={'crawler': self.crawler}) def _thread_stacks(self): id2name = dict((th.ident, th.name) for th in threading.enumerate()) dumps = '' for id_, frame in sys._current_frames().items(): name = id2name.get(id_, '') dump = ''.join(traceback.format_stack(frame)) dumps += f"# Thread: {name}({id_})\n{dump}\n" return dumps
[文档]class Debugger: 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)