__init__.py

# -*- coding: utf-8 -*-

"""
Copyright 2025 The Dapr 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.
"""

_LANGGRAPH_OPTIONAL_MODULES = frozenset({'msgpack', 'langchain_core', 'langgraph', 'ulid'})

try:
    from dapr.ext.langgraph.dapr_checkpointer import DaprCheckpointer
except ImportError as exc:
    if exc.name not in _LANGGRAPH_OPTIONAL_MODULES:
        raise
    raise ImportError(
        f'dapr.ext.langgraph is missing an optional dependency ({exc.name!r}). '
        f'Install the extension with: pip install "dapr[langgraph]"'
    ) from exc

__all__ = [
    'DaprCheckpointer',
]