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144 lines
4.3 KiB
Python
144 lines
4.3 KiB
Python
# Licensed to the Apache Software Foundation (ASF) under one
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# or more contributor license agreements. See the NOTICE file
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# distributed with this work for additional information
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# regarding copyright ownership. The ASF licenses this file
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# to you under the Apache License, Version 2.0 (the
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# "License"); you may not use this file except in compliance
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# with the License. You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing,
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# software distributed under the License is distributed on an
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# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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# KIND, either express or implied. See the License for the
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# specific language governing permissions and limitations
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# under the License.
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"""
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MCP Redis storage factory.
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Provides get_mcp_store(prefix) factory for creating stores with feature-specific
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prefixes. Uses shared MCP_STORE_CONFIG for Redis URL and wrapper type.
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Reusable across caching middleware, OAuth providers, EventStore, etc.
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"""
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import logging
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from importlib import import_module
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from typing import Any, Callable, Dict
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logger = logging.getLogger(__name__)
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def get_mcp_store(
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prefix: str | Callable[[], str],
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) -> Any | None:
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"""
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Create a store instance with the specified prefix.
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Uses shared MCP_STORE_CONFIG for Redis URL and wrapper type.
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Each caller provides their own prefix (cache, auth, events, etc.).
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Args:
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prefix: Feature-specific prefix (string or callable for multi-tenancy)
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Returns:
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Wrapped RedisStore instance or None if not configured/disabled
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Examples:
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# Caching
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cache_store = get_mcp_store(prefix=cache_prefix_lambda)
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# Auth (future)
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auth_store = get_mcp_store(prefix="mcp_auth_v1_")
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# EventStore (future)
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event_store = get_mcp_store(prefix=event_prefix_lambda)
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"""
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from flask import has_app_context
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from superset.mcp_service.flask_singleton import get_flask_app
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flask_app = get_flask_app()
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def _get_store() -> Any | None:
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store_config = flask_app.config.get("MCP_STORE_CONFIG", {})
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# Check if store is enabled
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if not store_config.get("enabled", False):
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logger.debug("MCP store disabled via config")
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return None
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return _create_redis_store(store_config, prefix)
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# Use existing app context if available, otherwise push one
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if has_app_context():
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return _get_store()
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else:
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with flask_app.app_context():
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return _get_store()
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def _create_redis_store(
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store_config: Dict[str, Any],
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prefix: str | Callable[[], str],
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) -> Any | None:
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"""
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Create a RedisStore with the given prefix.
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Args:
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store_config: MCP_STORE_CONFIG dict (Redis URL, wrapper type)
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prefix: Feature-specific prefix
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Returns:
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Wrapped RedisStore instance or None if not configured
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"""
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redis_url = store_config.get("CACHE_REDIS_URL")
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if not redis_url:
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logger.debug("MCP storage disabled - no CACHE_REDIS_URL configured")
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return None
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try:
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from key_value.aio.stores.redis import RedisStore
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except ImportError:
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logger.warning(
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"key_value package not available for Redis storage. "
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"Install with: pip install py-key-value-aio[redis]"
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)
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return None
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try:
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wrapper_type = store_config.get("WRAPPER_TYPE")
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if not wrapper_type:
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logger.error("MCP store WRAPPER_TYPE not configured")
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return None
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wrapper_class = _import_wrapper_class(wrapper_type)
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redis_store = RedisStore(url=redis_url)
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store = wrapper_class(key_value=redis_store, prefix=prefix)
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logger.info("✅ MCP RedisStore created")
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return store
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except Exception as e:
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logger.error("Failed to create MCP store: %s", e)
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return None
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def _import_wrapper_class(class_path: str) -> type:
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"""
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Import a wrapper class from a dotted path.
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Args:
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class_path: Dotted path like
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'key_value.aio.wrappers.prefix_keys.PrefixKeysWrapper'
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Returns:
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The imported class
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Raises:
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ImportError: If the class cannot be imported
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"""
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module_path, class_name = class_path.rsplit(".", 1)
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module = import_module(module_path)
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return getattr(module, class_name)
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