feat(key-value): add superset metastore cache (#19232)

(cherry picked from commit 72b9a7fa5b)

tests/integration_tests/extensions/metastore_cache_test.py

@@ -0,0 +1,76 @@
+# 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.
+from __future__ import annotations
+
+from datetime import datetime, timedelta
+from typing import TYPE_CHECKING
+from uuid import UUID
+
+import pytest
+from flask.ctx import AppContext
+from freezegun import freeze_time
+
+if TYPE_CHECKING:
+    from superset.extensions.metastore_cache import SupersetMetastoreCache
+
+FIRST_KEY = "foo"
+FIRST_KEY_INITIAL_VALUE = {"foo": "bar"}
+FIRST_KEY_UPDATED_VALUE = "foo"
+
+SECOND_KEY = "baz"
+SECOND_VALUE = "qwerty"
+
+
+@pytest.fixture
+def cache() -> SupersetMetastoreCache:
+    from superset.extensions.metastore_cache import SupersetMetastoreCache
+
+    return SupersetMetastoreCache(
+        namespace=UUID("ee173d1b-ccf3-40aa-941c-985c15224496"), default_timeout=600,
+    )
+
+
+def test_caching_flow(app_context: AppContext, cache: SupersetMetastoreCache) -> None:
+    assert cache.has(FIRST_KEY) is False
+    assert cache.add(FIRST_KEY, FIRST_KEY_INITIAL_VALUE) is True
+    assert cache.has(FIRST_KEY) is True
+    cache.set(SECOND_KEY, SECOND_VALUE)
+    assert cache.get(FIRST_KEY) == FIRST_KEY_INITIAL_VALUE
+    assert cache.get(SECOND_KEY) == SECOND_VALUE
+    assert cache.add(FIRST_KEY, FIRST_KEY_UPDATED_VALUE) is False
+    assert cache.get(FIRST_KEY) == FIRST_KEY_INITIAL_VALUE
+    assert cache.set(FIRST_KEY, FIRST_KEY_UPDATED_VALUE) == True
+    assert cache.get(FIRST_KEY) == FIRST_KEY_UPDATED_VALUE
+    cache.delete(FIRST_KEY)
+    assert cache.has(FIRST_KEY) is False
+    assert cache.get(FIRST_KEY) is None
+    assert cache.has(SECOND_KEY)
+    assert cache.get(SECOND_KEY) == SECOND_VALUE
+
+
+def test_expiry(app_context: AppContext, cache: SupersetMetastoreCache) -> None:
+    delta = timedelta(days=90)
+    dttm = datetime(2022, 3, 18, 0, 0, 0)
+    with freeze_time(dttm):
+        cache.set(FIRST_KEY, FIRST_KEY_INITIAL_VALUE, int(delta.total_seconds()))
+        assert cache.get(FIRST_KEY) == FIRST_KEY_INITIAL_VALUE
+    with freeze_time(dttm + delta - timedelta(seconds=1)):
+        assert cache.has(FIRST_KEY)
+        assert cache.get(FIRST_KEY) == FIRST_KEY_INITIAL_VALUE
+    with freeze_time(dttm + delta + timedelta(seconds=1)):
+        assert cache.has(FIRST_KEY) is False
+        assert cache.get(FIRST_KEY) is None