Provides Python function decorators for caching the values of functions and methods
Home Page: https://pypi.org/project/plone.memoize
plone.memoize provides Python function decorators for caching the values of functions and methods.
The type of cache storage is freely configurable by the user, as is the cache key, which is what the function's value depends on.
plone.memoize has support for memcached and is easily extended to use other caching storages. It also has specialized decorators for use with Zope views. However, plone.memoize can be used without Zope.
![pre-commit-ci[bot] avatar](https://avatars.githubusercontent.com/in/68672?v=4 "pre-commit-ci[bot]")
❯ tox -e py38
py38 installed: coverage==5.5,zc.buildout==2.13.3
py38 run-test-pre: PYTHONHASHSEED='2423449449'
py38 run-test: commands[0] | /tmp/plone.memoize/.tox/py38/bin/buildout -c /tmp/plone.memoize/buildout.cfg buildout:directory=/tmp/plone.memoize/.tox/py38 buildout:develop=/tmp/plone.memoize bootstrap
Creating directory '/tmp/plone.memoize/.tox/py38/develop-eggs'.
Generated script '/tmp/plone.memoize/.tox/py38/bin/buildout'.
py38 run-test: commands[1] | /tmp/plone.memoize/.tox/py38/bin/buildout -c /tmp/plone.memoize/buildout.cfg buildout:directory=/tmp/plone.memoize/.tox/py38 buildout:develop=/tmp/plone.memoize install test
Upgraded:
setuptools version 42.0.2;
restarting.
Generated script '/tmp/plone.memoize/.tox/py38/bin/buildout'.
While:
Initializing.
Error: Couldn't open /tmp/plone.memoize/.tox/py38/buildout.cfg
ERROR: InvocationError for command /tmp/plone.memoize/.tox/py38/bin/buildout -c buildout.cfg buildout:directory=/tmp/plone.memoize/.tox/py38 buildout:develop=/tmp/plone.memoize install test (exited with code 1)
_______________________________________________________________________________________ summary _______________________________________________________________________________________
ERROR: py38: commands failed
I noticed this as I ran tox / tox4-pre on all Zope/Plone repositories, see https://jugmac00.github.io/blog/testing-the-tox-4-pre-release-at-scale/
P.S. The above error is for tox 3, the current version.
The upcoming tox4 fails for a different reason... there is an endless setuptools update circle, which finally leads to memory exhaustion of the developer box.
plone.memoize on master via 🐍 v2.7.17 took 14s
❯ tox4 -e py38
py38: install_deps> python -I -m pip install coverage zc.buildout
py38: commands[0]> .tox/4/py38/bin/buildout -c /tmp/plone.memoize/buildout.cfg buildout:directory=/tmp/plone.memoize/.tox/4/py38 buildout:develop=/tmp/plone.memoize bootstrap
Creating directory '/tmp/plone.memoize/.tox/4/py38/eggs'.
Creating directory '/tmp/plone.memoize/.tox/4/py38/parts'.
Creating directory '/tmp/plone.memoize/.tox/4/py38/develop-eggs'.
Generated script '/tmp/plone.memoize/.tox/4/py38/bin/buildout'.
py38: commands[1]> .tox/4/py38/bin/buildout -c /tmp/plone.memoize/buildout.cfg buildout:directory=/tmp/plone.memoize/.tox/4/py38 buildout:develop=/tmp/plone.memoize install test
Getting distribution for 'setuptools==42.0.2'.
Got setuptools 42.0.2.
Upgraded:
setuptools version 42.0.2;
restarting.
Generated script '/tmp/plone.memoize/.tox/4/py38/bin/buildout'.
Upgraded:
setuptools version 42.0.2;
restarting.
Generated script '/tmp/plone.memoize/.tox/4/py38/bin/buildout'.
Upgraded:
setuptools version 42.0.2;
restarting.
Upgraded:
setuptools version 42.0.2;
restarting.
Upgraded:
setuptools version 42.0.2;
restarting.
I am not using this package, and unfortunately I won't have time to look into these issues.
view.memoize and view.memoize_contextless require to have a request attribute set to work.
Sometimes it might be useful to use it also for adapter or functions that do not have a request attribute.
It would be great if in this case the global request could be picked up.
Just to grab a number for towncrier
Running the tests with Plone 6.0 on Python 3.11 fails:
File "/Users/maurits/shared-eggs/cp311/plone.memoize-2.1.1-py3.11.egg/plone/memoize/request.rst", line 40, in request.rst
Failed example:
cached_increment(A(1))
Exception raised:
Traceback (most recent call last):
File "/Users/maurits/.pyenv/versions/3.11.0rc2/lib/python3.11/doctest.py", line 1350, in __run
exec(compile(example.source, filename, "single",
File "<doctest request.rst[10]>", line 1, in <module>
cached_increment(A(1))
File "/Users/maurits/shared-eggs/cp311/plone.memoize-2.1.1-py3.11.egg/plone/memoize/volatile.py", line 71, in replacement
cache = get_cache(fun, *args, **kwargs)
File "/Users/maurits/shared-eggs/cp311/plone.memoize-2.1.1-py3.11.egg/plone/memoize/request.py", line 56, in _store_in_annotation
spec = inspect.getargspec(fun)
AttributeError: module 'inspect' has no attribute 'getargspec'
As suggested by @thet in #18 (review)
As @polyester reported, it was decided in September 2010 to license plone.memoize again under the BSD instead of the GPL license. Unfortunately it was forgotten to maintain the license change also in the source code. Could someone please adjust the license so that python projects that are not licensed under the GPL can also use the library?
On FIPS enabled environments, starting Plone fails with
...
...
File "/opt/plone/buildout-cache/eggs/plone.memoize-2.1.0-py3.6.egg/plone/memoize/volatile.py", line 72, in replacement
cached_value = cache.get(key, _marker)
File "/opt/plone/buildout-cache/eggs/plone.memoize-2.1.0-py3.6.egg/plone/memoize/ram.py", line 36, in get
return self.__getitem__(key)
File "/opt/plone/buildout-cache/eggs/plone.memoize-2.1.0-py3.6.egg/plone/memoize/ram.py", line 75, in __getitem__
self.globalkey, dict(key=self._make_key(key)), MARKER
File "/opt/plone/buildout-cache/eggs/plone.memoize-2.1.0-py3.6.egg/plone/memoize/ram.py", line 71, in _make_key
return md5(source).digest()
ValueError: [digital envelope routines: EVP_DigestInit_ex] disabled for FIPS
There is a flag that can be used when hasing with md5 in a non security related usage that is not available if FIPS is not enabled in the environment called usedforsecurity
I will submit a PR shortly with a proposed fix (The same that was done with zodb/relstorage#481)
On TravisCI the tests are run against recent versions of the dependencies. This currently fails: https://travis-ci.org/plone/plone.memoize/builds/418577118
The tests should be fixed because this package is also used outside Plone.
If you look at plone.memoize.view code it is using a marker to check if the cache is cold, something like in this function:
_marker = object()
def old(d):
value = d.get("key", _marker)
if value is _marker:
value = d["key"] = 1
return valueTheoretically this should be equivalent and simpler:
def new(d):
if "key" not in d:
d["key"] = 1
return d["key"]In addition it seems to perform better:
from timeit import timeit
empty = {}
not_empty = {"key": 1}
def _benchmark(value):
print(value, timeit(value, number=10000000, globals=globals()))
_benchmark("old(empty)")
_benchmark("old(not_empty)")
_benchmark("new(empty)")
_benchmark("new(not_empty)")
_benchmark("old(empty)")
_benchmark("old(not_empty)")
_benchmark("new(empty)")
_benchmark("new(not_empty)")These are the results:
[ale@emily benchmark]$ python3 in.py
old(empty) 1.3479654699913226
old(not_empty) 1.3339006070164032
new(empty) 0.9015584019944072
new(not_empty) 0.9282507239840925
old(empty) 1.3717991490266286
old(not_empty) 1.4188532830448821
new(empty) 0.9324833910213783
new(not_empty) 0.943703431985341
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