feat: simplify memoized_func (#19905)

superset/models/core.py

@@ -514,7 +514,7 @@ class Database(
         return sqla.inspect(engine)
 
     @cache_util.memoized_func(
-        key=lambda self, *args, **kwargs: f"db:{self.id}:schema:None:table_list",
+        key="db:{self.id}:schema:None:table_list",
         cache=cache_manager.data_cache,
     )
     def get_all_table_names_in_database(  # pylint: disable=unused-argument
@@ -529,7 +529,7 @@ class Database(
         return self.db_engine_spec.get_all_datasource_names(self, "table")
 
     @cache_util.memoized_func(
-        key=lambda self, *args, **kwargs: f"db:{self.id}:schema:None:view_list",
+        key="db:{self.id}:schema:None:view_list",
         cache=cache_manager.data_cache,
     )
     def get_all_view_names_in_database(  # pylint: disable=unused-argument
@@ -544,7 +544,7 @@ class Database(
         return self.db_engine_spec.get_all_datasource_names(self, "view")
 
     @cache_util.memoized_func(
-        key=lambda self, schema, *args, **kwargs: f"db:{self.id}:schema:{schema}:table_list",  # pylint: disable=line-too-long,useless-suppression
+        key="db:{self.id}:schema:{schema}:table_list",
         cache=cache_manager.data_cache,
     )
     def get_all_table_names_in_schema(  # pylint: disable=unused-argument
@@ -577,7 +577,7 @@ class Database(
             return []
 
     @cache_util.memoized_func(
-        key=lambda self, schema, *args, **kwargs: f"db:{self.id}:schema:{schema}:view_list",  # pylint: disable=line-too-long,useless-suppression
+        key="db:{self.id}:schema:{schema}:view_list",
         cache=cache_manager.data_cache,
     )
     def get_all_view_names_in_schema(  # pylint: disable=unused-argument
@@ -608,7 +608,7 @@ class Database(
             return []
 
     @cache_util.memoized_func(
-        key=lambda self, *args, **kwargs: f"db:{self.id}:schema_list",
+        key="db:{self.id}:schema_list",
         cache=cache_manager.data_cache,
     )
     def get_all_schema_names(  # pylint: disable=unused-argument

superset/utils/cache.py

@@ -16,6 +16,7 @@
 # under the License.
 from __future__ import annotations
 
+import inspect
 import logging
 from datetime import datetime, timedelta
 from functools import wraps
@@ -94,7 +95,7 @@ def view_cache_key(*args: Any, **kwargs: Any) -> str:  # pylint: disable=unused-
 
 
 def memoized_func(
-    key: Callable[..., str] = view_cache_key,
+    key: Optional[str] = None,
     cache: Cache = cache_manager.cache,
 ) -> Callable[..., Any]:
     """Use this decorator to cache functions that have predefined first arg.
@@ -114,15 +115,23 @@ def memoized_func(
     """
 
     def wrap(f: Callable[..., Any]) -> Callable[..., Any]:
-        def wrapped_f(self: Any, *args: Any, **kwargs: Any) -> Any:
+        def wrapped_f(*args: Any, **kwargs: Any) -> Any:
             if not kwargs.get("cache", True):
-                return f(self, *args, **kwargs)
+                return f(*args, **kwargs)
+
+            if key:
+                # format the key using args/kwargs passed to the decorated function
+                signature = inspect.signature(f)
+                bound_args = signature.bind(*args, **kwargs)
+                bound_args.apply_defaults()
+                cache_key = key.format(**bound_args.arguments)
+            else:
+                cache_key = view_cache_key(*args, **kwargs)
 
-            cache_key = key(self, *args, **kwargs)
             obj = cache.get(cache_key)
             if not kwargs.get("force") and obj is not None:
                 return obj
-            obj = f(self, *args, **kwargs)
+            obj = f(*args, **kwargs)
             cache.set(cache_key, obj, timeout=kwargs.get("cache_timeout"))
             return obj
 

tests/unit_tests/utils/cache_test.py

@@ -0,0 +1,52 @@
+# -*- coding: utf-8 -*-
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you 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.
+
+# pylint: disable=import-outside-toplevel, unused-argument
+
+from pytest_mock import MockerFixture
+
+
+def test_memoized_func(app_context: None, mocker: MockerFixture) -> None:
+    """
+    Test the ``memoized_func`` decorator.
+    """
+    from superset.utils.cache import memoized_func
+
+    cache = mocker.MagicMock()
+
+    decorator = memoized_func("db:{self.id}:schema:{schema}:view_list", cache)
+    decorated = decorator(lambda self, schema, cache=False: 42)
+
+    self = mocker.MagicMock()
+    self.id = 1
+
+    # skip cache
+    result = decorated(self, "public", cache=False)
+    assert result == 42
+    cache.get.assert_not_called()
+
+    # check cache, no cached value
+    cache.get.return_value = None
+    result = decorated(self, "public", cache=True)
+    assert result == 42
+    cache.get.assert_called_with("db:1:schema:public:view_list")
+
+    # check cache, cached value
+    cache.get.return_value = 43
+    result = decorated(self, "public", cache=True)
+    assert result == 43