refactor ChartDataCommand - separate loading query_context form cache into different module (#17405)

superset/charts/data/query_context_cache_loader.py

@@ -0,0 +1,30 @@
+# 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 typing import Any, Dict
+
+from superset import cache
+from superset.charts.commands.exceptions import ChartDataCacheLoadError
+
+
+class QueryContextCacheLoader:  # pylint: disable=too-few-public-methods
+    @staticmethod
+    def load(cache_key: str) -> Dict[str, Any]:
+        cache_value = cache.get(cache_key)
+        if not cache_value:
+            raise ChartDataCacheLoadError("Cached data not found")
+
+        return cache_value["data"]