Add ignore_all

README.md

@@ -23,7 +23,7 @@ An easy to use decorator for persistent memoization: like `functools.lrucache`,
 - Async functions supported.
 - Automatic cache invalidation when the decorated function arguments or code have been changed.
 - Time-to-live (TTL) support - automatically invalidate cache entries after a certain time.
-- You can ignore changes in certain arguments of the decorated function.
+- You can ignore changes in certain arguments of the decorated function or all of them.
 - Various serialization formats: JSON, YAML, pickle, Parquet, CSV etc.
 - Various storage backends:
     - local disk (_implemented_) or
@@ -108,7 +108,10 @@ def get_data():
     ...
 ```
 ### Ignoring certain arguments
-By specifying the arguments that should be ignored, you can still use the cache even in the values of these arguments have changed. **NOTE** that the decorated function should be called with ignored arguments specified as keyword arguments.
+By specifying the arguments that should be ignored, you can still use the cache even in the values of these arguments have changed.
+
+**NOTE** that the decorated function should be called with ignored arguments specified as keyword arguments.
+
 ```python
 @cache.cache(ignore=["ignore_this"])
 def get_data(key, ignore_this):
@@ -123,7 +126,7 @@ print(get_data("abc", ignore_this="ignore_1"))  # the function has been called
 print(get_data("abc", ignore_this="ignore_2"))
 # abc
 ```
-
+You can use `ignore_all` to ignore all arguments.
 ### Changing the default serialization format and storage backend
 ```python
 # set up serialization format and storage backend
@@ -223,6 +226,8 @@ The cache will be invalidated if the function code, its argument values or the c
 ##### Arguments
 - `ignore (Iterable[str])`: keyword arguments of the decorated function that will not be used in making the cache key. In other words, changes in these arguments will not invalidate the cache. Defaults to `None`.
 
+- `ignore_all (bool)`: if `True`, all arguments will be ignored. Defaults to `False`.
+
 - `serializer (perscache.serializers.Serializer)`: Overrides the default `Cache()` serializer. Defaults to `None`.
 
 - `storage (perscache.storage.Storage)`: Overrides the default `Cache()` storage. Defaults to `None`.

perscache/cache.py

@@ -48,13 +48,17 @@ def get_key(
         kwargs: dict,
         serializer: Serializer,
         ignore: Iterable[str],
+        ignore_all: bool,
     ) -> str:
         """Get a cache key."""
 
         # Remove ignored arguments from the arguments tuple and kwargs dict
         if ignore is not None:
             kwargs = {k: v for k, v in kwargs.items() if k not in ignore}
 
+        if ignore_all:
+            args, kwargs = None, None
+
         return hash_it(inspect.getsource(fn), type(serializer), args, kwargs)
 
     def get_filename(self, fn: callable, key: str, serializer: Serializer) -> str:
@@ -63,6 +67,7 @@ def get_filename(self, fn: callable, key: str, serializer: Serializer) -> str:
     def cache(
         self,
         ignore: Iterable[str] = None,
+        ignore_all: bool = False,
         serializer: Serializer = None,
         storage: Storage = None,
         ttl: dt.timedelta = None,
@@ -77,7 +82,7 @@ def decorator(fn):
 
             @functools.wraps(fn)
             def non_async_wrapper(*args, **kwargs):
-                key = self.get_key(fn, args, kwargs, ser, ignore)
+                key = self.get_key(fn, args, kwargs, ser, ignore, ignore_all)
                 key = self.get_filename(fn, key, ser)
                 try:
                     deadline = dt.datetime.now(dt.timezone.utc) - ttl if ttl else None
@@ -89,7 +94,7 @@ def non_async_wrapper(*args, **kwargs):
 
             @functools.wraps(fn)
             async def async_wrapper(*args, **kwargs):
-                key = self.get_key(fn, args, kwargs, ser, ignore)
+                key = self.get_key(fn, args, kwargs, ser, ignore, ignore_all)
                 key = self.get_filename(fn, key, ser)
                 try:
                     deadline = dt.datetime.now(dt.timezone.utc) - ttl if ttl else None

tests/test_main.py

@@ -72,14 +72,14 @@ def test_body_change(cache: Cache):
     def get_data(key):
         return key
 
-    hash1 = cache.get_key(get_data, None, None, None, None)
+    hash1 = cache.get_key(get_data, None, None, None, None, None)
 
     @cache.cache()
     def get_data(key):
         print("This function has been changed...")
         return key
 
-    hash2 = cache.get_key(get_data, None, None, None, None)
+    hash2 = cache.get_key(get_data, None, None, None, None, None)
 
     assert hash1 != hash2
 
@@ -127,6 +127,23 @@ def get_data(key, ignore_this):
     assert counter == 1
 
 
+def test_ignore_all(cache):
+
+    counter = 0
+
+    @cache.cache(ignore_all=True)
+    def get_data(key1, key2):
+        nonlocal counter
+        counter += 1
+        return key1, key2
+
+    get_data("abc", "def")
+    assert counter == 1
+
+    get_data("def", "ghi")
+    assert counter == 1
+
+
 def test_no_cache():
     counter = 0
 
@@ -186,5 +203,7 @@ def test_hash():
     for data1, data2 in data():
         assert data1 != data2
         assert cache.get_key(
-            lambda: None, (data1,), None, CloudPickleSerializer(), None
-        ) != cache.get_key(lambda: None, (data2,), None, CloudPickleSerializer(), None)
+            lambda: None, (data1,), None, CloudPickleSerializer(), None, None
+        ) != cache.get_key(
+            lambda: None, (data2,), None, CloudPickleSerializer(), None, None
+        )