| # Python Substrate Interface Library | |
| # | |
| # Copyright 2018-2021 Stichting Polkascan (Polkascan Foundation). | |
| # | |
| # 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. | |
| from functools import lru_cache | |
| def block_dependent_lru_cache(maxsize=10, typed=False, block_arg_index=None): | |
| def decorator(f): | |
| cached_func = lru_cache(maxsize=maxsize, typed=typed)(f) | |
| def wrapper(*args, **kwargs): | |
| use_cache = False | |
| if block_arg_index is not None: | |
| if len(args) > block_arg_index and args[block_arg_index] is not None: | |
| use_cache = True | |
| if kwargs.get('block_hash') is not None or kwargs.get('block_id') is not None: | |
| use_cache = True | |
| if use_cache: | |
| return cached_func(*args, **kwargs) | |
| else: | |
| return f(*args, **kwargs) | |
| return wrapper | |
| return decorator | |