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73 lines
2.3 KiB
Python
73 lines
2.3 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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from __future__ import annotations
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import logging
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import uuid
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from typing import Any, TYPE_CHECKING
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from flask import current_app
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from superset.commands.base import BaseCommand
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from superset.distributed_lock.utils import get_key
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from superset.extensions import cache_manager
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from superset.key_value.types import JsonKeyValueCodec, KeyValueResource
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if TYPE_CHECKING:
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import redis
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logger = logging.getLogger(__name__)
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def get_default_lock_ttl() -> int:
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"""Get the default lock TTL from config."""
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return int(current_app.config.get("DISTRIBUTED_LOCK_DEFAULT_TTL", 30))
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def get_redis_client() -> "redis.Redis[Any] | None":
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"""
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Get Redis client from distributed coordination if available.
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Returns None if DISTRIBUTED_COORDINATION_CONFIG is not configured,
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allowing fallback to database-backed locking.
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"""
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backend = cache_manager.distributed_coordination
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return backend._cache if backend else None
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class BaseDistributedLockCommand(BaseCommand):
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"""Base command for distributed lock operations."""
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key: uuid.UUID
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namespace: str
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codec = JsonKeyValueCodec()
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resource = KeyValueResource.LOCK
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def __init__(self, namespace: str, params: dict[str, Any] | None = None) -> None:
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self.namespace = namespace
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self.params = params or {}
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self.key = get_key(namespace, **self.params)
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@property
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def redis_lock_key(self) -> str:
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"""Redis key for this lock."""
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return f"lock:{self.namespace}:{self.key}"
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def validate(self) -> None:
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pass
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