#toolbar的中间件的响应处理函数，会调用到panel.generate_stats(request, response)
def process_response(self, request, response): toolbar = self.__class__.debug_toolbars.pop(threading.current_thread().ident, None) if not toolbar:#DebugToolbar对象，每请求对应一个，它可以存储各panel的数据 return response # Run process_response methods of panels like Django middleware. for panel in reversed(toolbar.enabled_panels): new_response = panel.process_response(request, response) if new_response: response = new_response # Deactivate instrumentation ie. monkey-unpatch. This must run # regardless of the response. Keep 'return' clauses below. # (NB: Django's model for middleware doesn't guarantee anything.) for panel in reversed(toolbar.enabled_panels):#禁止调试模板 panel.disable_instrumentation() # Check for responses where the toolbar can't be inserted. content_encoding = response.get('Content-Encoding', '') content_type = response.get('Content-Type', '').split(';')[0] if any((getattr(response, 'streaming', False), 'gzip' in content_encoding, content_type not in _HTML_TYPES)): return response # Collapse the toolbar by default if SHOW_COLLAPSED is set. if toolbar.config['SHOW_COLLAPSED'] and 'djdt' not in request.COOKIES: response.set_cookie('djdt', 'hide', 864000) # Insert the toolbar in the response. content = force_text(response.content, encoding=settings.DEFAULT_CHARSET) insert_before = dt_settings.CONFIG['INSERT_BEFORE']#'/body' try: # Python >= 2.7 pattern = re.escape(insert_before) bits = re.split(pattern, content, flags=re.IGNORECASE) except TypeError: # Python < 2.7 pattern = '(.+?)(%s|$)' % re.escape(insert_before) matches = re.findall(pattern, content, flags=re.DOTALL | re.IGNORECASE) bits = [m[0] for m in matches if m[1] == insert_before] # When the body ends with a newline, there's two trailing groups. bits.append(''.join(m[0] for m in matches if m[1] == '')) if len(bits) > 1: # When the toolbar will be inserted for sure, generate the stats. for panel in reversed(toolbar.enabled_panels): panel.generate_stats(request, response)#调用panel生成统计数据 bits[-2] += toolbar.render_toolbar()#bits[-2]为倒数第二个，即/body前面的内容 response.content = insert_before.join(bits) if response.get('Content-Length', None): response['Content-Length'] = len(response.content) return response
timerpanel时间统计的面板：
def generate_stats(self, request, response): stats = {} if hasattr(self, '_start_time'): stats['total_time'] = (time.time() - self._start_time) * 1000#总共花费的时间 if hasattr(self, '_start_rusage'): self._end_rusage = resource.getrusage(resource.RUSAGE_SELF) stats['utime'] = 1000 * self._elapsed_ru('ru_utime') stats['stime'] = 1000 * self._elapsed_ru('ru_stime') stats['total'] = stats['utime'] + stats['stime'] stats['vcsw'] = self._elapsed_ru('ru_nvcsw') stats['ivcsw'] = self._elapsed_ru('ru_nivcsw') stats['minflt'] = self._elapsed_ru('ru_minflt') stats['majflt'] = self._elapsed_ru('ru_majflt') # these are documented as not meaningful under Linux. If you're running BSD # feel free to enable them, and add any others that I hadn't gotten to before # I noticed that I was getting nothing but zeroes and that the docs agreed. :-( # # stats['blkin'] = self._elapsed_ru('ru_inblock') # stats['blkout'] = self._elapsed_ru('ru_oublock') # stats['swap'] = self._elapsed_ru('ru_nswap') # stats['rss'] = self._end_rusage.ru_maxrss # stats['srss'] = self._end_rusage.ru_ixrss # stats['urss'] = self._end_rusage.ru_idrss # stats['usrss'] = self._end_rusage.ru_isrss self.record_stats(stats)#调用记录统计函数。
#panel的记录函数
def record_stats(self, stats): """ Store data gathered by the panel. ``stats`` is a :class:`dict`. Each call to ``record_stats`` updates the statistics dictionary. """ self.toolbar.stats.setdefault(self.panel_id, {}).update(stats)#更新后，每个请求后的数据统计
