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115 lines
3.8 KiB
Python
115 lines
3.8 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright (c) 2025 relakkes@gmail.com
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#
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# This file is part of MediaCrawler project.
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# Repository: https://github.com/NanmiCoder/MediaCrawler/blob/main/cache/redis_cache.py
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# GitHub: https://github.com/NanmiCoder
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# Licensed under NON-COMMERCIAL LEARNING LICENSE 1.1
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#
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# 声明：本代码仅供学习和研究目的使用。使用者应遵守以下原则：
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# 1. 不得用于任何商业用途。
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# 2. 使用时应遵守目标平台的使用条款和robots.txt规则。
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# 3. 不得进行大规模爬取或对平台造成运营干扰。
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# 4. 应合理控制请求频率，避免给目标平台带来不必要的负担。
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# 5. 不得用于任何非法或不当的用途。
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#
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# 详细许可条款请参阅项目根目录下的LICENSE文件。
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# 使用本代码即表示您同意遵守上述原则和LICENSE中的所有条款。
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# -*- coding: utf-8 -*-
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# @Author : relakkes@gmail.com
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# @Name : Programmer AJiang-Relakkes
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# @Time : 2024/5/29 22:57
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# @Desc : RedisCache implementation
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import pickle
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import time
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from typing import Any, List
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from redis import Redis
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from redis.exceptions import ResponseError
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from cache.abs_cache import AbstractCache
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from config import db_config
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class RedisCache(AbstractCache):
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def __init__(self) -> None:
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# Connect to redis, return redis client
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self._redis_client = self._connet_redis()
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@staticmethod
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def _connet_redis() -> Redis:
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"""
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Connect to redis, return redis client, configure redis connection information as needed
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:return:
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"""
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return Redis(
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host=db_config.REDIS_DB_HOST,
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port=db_config.REDIS_DB_PORT,
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db=db_config.REDIS_DB_NUM,
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password=db_config.REDIS_DB_PWD,
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)
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def get(self, key: str) -> Any:
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"""
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Get the value of a key from the cache and deserialize it
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:param key:
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:return:
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"""
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value = self._redis_client.get(key)
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if value is None:
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return None
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return pickle.loads(value)
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def set(self, key: str, value: Any, expire_time: int) -> None:
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"""
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Set the value of a key in the cache and serialize it
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:param key:
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:param value:
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:param expire_time:
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:return:
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"""
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self._redis_client.set(key, pickle.dumps(value), ex=expire_time)
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def keys(self, pattern: str) -> List[str]:
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"""
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Get all keys matching the pattern
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First try KEYS command, if not supported fallback to SCAN
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"""
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try:
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# Try KEYS command first (faster for standard Redis)
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return [key.decode() if isinstance(key, bytes) else key for key in self._redis_client.keys(pattern)]
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except ResponseError as e:
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# If KEYS is not supported (e.g., Redis Cluster or cloud Redis), use SCAN
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if "unknown command" in str(e).lower() or "keys" in str(e).lower():
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keys_list: List[str] = []
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cursor = 0
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while True:
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cursor, keys = self._redis_client.scan(cursor=cursor, match=pattern, count=100)
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keys_list.extend([key.decode() if isinstance(key, bytes) else key for key in keys])
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if cursor == 0:
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break
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return keys_list
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else:
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# Re-raise if it's a different error
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raise
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if __name__ == '__main__':
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redis_cache = RedisCache()
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# basic usage
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redis_cache.set("name", "Programmer AJiang-Relakkes", 1)
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print(redis_cache.get("name")) # Relakkes
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print(redis_cache.keys("*")) # ['name']
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time.sleep(2)
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print(redis_cache.get("name")) # None
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# special python type usage
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# list
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redis_cache.set("list", [1, 2, 3], 10)
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_value = redis_cache.get("list")
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print(_value, f"value type:{type(_value)}") # [1, 2, 3]
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