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# Copyright 2024 The etils Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Better error for adhoc reload."""
import functools
import IPython
@functools.cache
def register_better_reload_error() -> None:
ip = IPython.get_ipython()
if ip is None: # In tests
return
# What if this conflict with other `ip.set_custom_exc` ?
# Ideally, should support multiple handlers
ip.set_custom_exc((NameError,), _maybe_better_error)
def _maybe_better_error(self, type_, value, traceback, tb_offset=None):
"""Update the error message."""
if (
type(value) is NameError # pylint: disable=unidiomatic-typecheck
and len(value.args) == 1
and _is_from_invalidate_module(value)
):
(msg,) = value.args
value.args = tuple([
msg
+ "\nYou're trying to use an object created with an old version of a"
' module you reloaded. Please re-create the object with the reloaded'
' module.'
])
self.showtraceback(
(type_, value, traceback),
tb_offset=tb_offset,
)
def _is_from_invalidate_module(exc: Exception) -> bool:
"""Check whether the exception is from an invalidated module."""
tb = exc.__traceback__
while tb is not None:
frame = tb.tb_frame
if '__etils_invalidated__' in frame.f_globals:
return True
tb = tb.tb_next
return False
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