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# Copyright 2017 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
import functools
import logging
def Memoize(f):
"""Decorator to cache return values of function."""
memoize_dict = {}
@functools.wraps(f)
def wrapper(*args, **kwargs):
key = repr((args, kwargs))
if key not in memoize_dict:
memoize_dict[key] = f(*args, **kwargs)
return memoize_dict[key]
return wrapper
def NoRaiseException(default_return_value=None, exception_message=''):
"""Returns decorator that catches and logs uncaught Exceptions.
Args:
default_return_value: Value to return in the case of uncaught Exception.
exception_message: Message for uncaught exceptions.
"""
def decorator(f):
@functools.wraps(f)
def wrapper(*args, **kwargs):
try:
return f(*args, **kwargs)
except Exception: # pylint: disable=broad-except
logging.exception(exception_message)
return default_return_value
return wrapper
return decorator