import linecache import traceback from . import base_futures from . import coroutines def _task_repr_info(task): info = base_futures._future_repr_info(task) if task._must_cancel: # replace status info[0] = 'cancelling' coro = coroutines._format_coroutine(task._coro) info.insert(1, 'coro=<%s>' % coro) if task._fut_waiter is not None: info.insert(2, 'wait_for=%r' % task._fut_waiter) return info def _task_get_stack(task, limit): frames = [] try: # 'async def' coroutines f = task._coro.cr_frame except AttributeError: f = task._coro.gi_frame if f is not None: while f is not None: if limit is not None: if limit <= 0: break limit -= 1 frames.append(f) f = f.f_back frames.reverse() elif task._exception is not None: tb = task._exception.__traceback__ while tb is not None: if limit is not None: if limit <= 0: break limit -= 1 frames.append(tb.tb_frame) tb = tb.tb_next return frames def _task_print_stack(task, limit, file): extracted_list = [] checked = set() for f in task.get_stack(limit=limit): lineno = f.f_lineno co = f.f_code filename = co.co_filename name = co.co_name if filename not in checked: checked.add(filename) linecache.checkcache(filename) line = linecache.getline(filename, lineno, f.f_globals) extracted_list.append((filename, lineno, name, line)) exc = task._exception if not extracted_list: print('No stack for %r' % task, file=file) elif exc is not None: print('Traceback for %r (most recent call last):' % task, file=file) else: print('Stack for %r (most recent call last):' % task, file=file) traceback.print_list(extracted_list, file=file) if exc is not None: for line in traceback.format_exception_only(exc.__class__, exc): print(line, file=file, end='')