147 lines
5.1 KiB
Python
147 lines
5.1 KiB
Python
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"""
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Redis Service для кеширования, rate limiting, сессий
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"""
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import redis.asyncio as redis
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from typing import Optional, Any
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import json
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from ..config import settings
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import logging
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logger = logging.getLogger(__name__)
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class RedisService:
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"""Сервис для работы с Redis"""
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def __init__(self):
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self.client: Optional[redis.Redis] = None
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async def connect(self):
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"""Подключение к Redis"""
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try:
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self.client = await redis.from_url(
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settings.redis_url,
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encoding="utf-8",
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decode_responses=True
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)
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await self.client.ping()
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logger.info(f"✅ Redis connected: {settings.redis_host}:{settings.redis_port}")
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except Exception as e:
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logger.error(f"❌ Redis connection error: {e}")
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raise
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async def disconnect(self):
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"""Отключение от Redis"""
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if self.client:
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await self.client.close()
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logger.info("Redis connection closed")
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async def get(self, key: str) -> Optional[str]:
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"""Получить значение по ключу"""
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full_key = f"{settings.redis_prefix}{key}"
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return await self.client.get(full_key)
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async def set(self, key: str, value: Any, expire: Optional[int] = None):
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"""Установить значение с опциональным TTL (в секундах)"""
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full_key = f"{settings.redis_prefix}{key}"
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if isinstance(value, (dict, list)):
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value = json.dumps(value)
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if expire:
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await self.client.setex(full_key, expire, value)
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else:
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await self.client.set(full_key, value)
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async def delete(self, key: str) -> bool:
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"""Удалить ключ"""
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full_key = f"{settings.redis_prefix}{key}"
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result = await self.client.delete(full_key)
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return result > 0
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async def exists(self, key: str) -> bool:
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"""Проверить существование ключа"""
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full_key = f"{settings.redis_prefix}{key}"
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return await self.client.exists(full_key) > 0
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async def increment(self, key: str, amount: int = 1) -> int:
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"""Инкремент значения"""
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full_key = f"{settings.redis_prefix}{key}"
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return await self.client.incrby(full_key, amount)
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async def expire(self, key: str, seconds: int):
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"""Установить TTL для ключа"""
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full_key = f"{settings.redis_prefix}{key}"
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await self.client.expire(full_key, seconds)
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async def get_json(self, key: str) -> Optional[dict]:
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"""Получить JSON значение"""
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value = await self.get(key)
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if value:
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try:
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return json.loads(value)
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except json.JSONDecodeError:
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return None
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return None
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async def set_json(self, key: str, value: dict, expire: Optional[int] = None):
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"""Установить JSON значение"""
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await self.set(key, json.dumps(value), expire)
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async def health_check(self) -> bool:
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"""Проверка здоровья Redis"""
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try:
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return await self.client.ping()
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except Exception as e:
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logger.error(f"Redis health check failed: {e}")
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return False
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# ============================================
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# RATE LIMITING
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# ============================================
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async def check_rate_limit(self, identifier: str, max_requests: int, window_seconds: int) -> tuple[bool, int]:
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"""
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Проверка rate limiting
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Returns: (allowed: bool, remaining: int)
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"""
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key = f"ratelimit:{identifier}"
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full_key = f"{settings.redis_prefix}{key}"
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current = await self.client.get(full_key)
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if current is None:
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# Первый запрос в окне
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await self.client.setex(full_key, window_seconds, 1)
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return True, max_requests - 1
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current_count = int(current)
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if current_count >= max_requests:
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# Лимит превышен
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ttl = await self.client.ttl(full_key)
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return False, 0
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# Инкремент счетчика
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new_count = await self.client.incr(full_key)
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return True, max_requests - new_count
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# ============================================
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# CACHE
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# ============================================
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async def cache_get(self, cache_key: str) -> Optional[Any]:
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"""Получить из кеша"""
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return await self.get_json(f"cache:{cache_key}")
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async def cache_set(self, cache_key: str, value: Any, ttl: int = 3600):
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"""Сохранить в кеш (TTL по умолчанию 1 час)"""
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await self.set_json(f"cache:{cache_key}", value, ttl)
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async def cache_delete(self, cache_key: str):
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"""Удалить из кеша"""
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await self.delete(f"cache:{cache_key}")
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# Глобальный экземпляр
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redis_service = RedisService()
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