52 lines
1.6 KiB
Python
52 lines
1.6 KiB
Python
from inspect import signature
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from django.core.cache import cache
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from django.db.models.query import QuerySet
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import hashlib
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MAX_NUM_CHAR = 15
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NONE_RESULT = "__None__"
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def cache_wrapper(prefix, timeout=None):
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def arg_to_str(arg):
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if hasattr(arg, "id"):
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return str(arg.id)
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if isinstance(arg, list) or isinstance(arg, QuerySet):
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return hashlib.sha1(str(list(arg)).encode()).hexdigest()[:MAX_NUM_CHAR]
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if len(str(arg)) > MAX_NUM_CHAR:
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return str(arg)[:MAX_NUM_CHAR]
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return str(arg)
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def get_key(func, *args, **kwargs):
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args_list = list(args)
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signature_args = list(signature(func).parameters.keys())
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args_list += [kwargs.get(k) for k in signature_args[len(args) :]]
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args_list = [arg_to_str(i) for i in args_list]
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key = prefix + ":" + ":".join(args_list)
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key = key.replace(" ", "_")
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return key
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def decorator(func):
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def wrapper(*args, **kwargs):
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cache_key = get_key(func, *args, **kwargs)
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result = cache.get(cache_key)
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if result is not None:
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if result == NONE_RESULT:
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result = None
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return result
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if result is None:
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result = NONE_RESULT
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result = func(*args, **kwargs)
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cache.set(cache_key, result, timeout)
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return result
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def dirty(*args, **kwargs):
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cache_key = get_key(func, *args, **kwargs)
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cache.delete(cache_key)
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wrapper.dirty = dirty
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return wrapper
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return decorator
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