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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'
info.insert(1, 'name=%r' % task.get_name())
coro = coroutines._format_coroutine(task._coro)
info.insert(2, f'coro=<{coro}>')
if task._fut_waiter is not None:
info.insert(3, f'wait_for={task._fut_waiter!r}')
return info
def _task_get_stack(task, limit):
frames = []
if hasattr(task._coro, 'cr_frame'):
# case 1: 'async def' coroutines
f = task._coro.cr_frame
elif hasattr(task._coro, 'gi_frame'):
# case 2: legacy coroutines
f = task._coro.gi_frame
elif hasattr(task._coro, 'ag_frame'):
# case 3: async generators
f = task._coro.ag_frame
else:
# case 4: unknown objects
f = None
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(f'No stack for {task!r}', file=file)
elif exc is not None:
print(f'Traceback for {task!r} (most recent call last):', file=file)
else:
print(f'Stack for {task!r} (most recent call last):', 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='')