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import logging
from typing import Any, Dict, Optional
import redis
from redis.exceptions import RedisError
from app.core.settings import settings
logger = logging.getLogger(__name__)
class CacheManager:
CACHE_PREFIX = "mathminds:cache:"
MAX_CACHE_SIZE = 50000
def __init__(
self,
redis_url: Optional[str] = None,
connection_pool: Optional[redis.ConnectionPool] = None,
):
self.redis_url = redis_url or settings.REDIS_URL
self.redis_client = None
try:
if connection_pool:
self.redis_client = redis.Redis(
connection_pool=connection_pool,
decode_responses=True,
)
else:
self.redis_client = redis.from_url(
self.redis_url,
decode_responses=True,
socket_timeout=2,
socket_connect_timeout=2,
)
self.redis_client.ping()
logger.info(f"Connected to Redis at {self.redis_url}")
except RedisError as e:
logger.error(f"Redis connection failed: {e}")
self.redis_client = None
def _serialize(self, data: Any) -> str:
return json.dumps(data, default=str)
def _prefixed(self, key: str) -> str:
return f"{self.CACHE_PREFIX}{key}"
def get_cached_answer(self, cache_key: str) -> Optional[Dict[str, Any]]:
if not self.redis_client:
return None
try:
key = self._prefixed(cache_key)
data = self.redis_client.get(key)
if data:
logger.debug(f"Cache hit: {key}")
return json.loads(data)
return None
except (RedisError, json.JSONDecodeError) as e:
logger.error(f"Cache read error: {e}")
return None
def set_cached_answer(
self,
cache_key: str,
answer: Dict[str, Any],
ttl: int = 86400,
) -> bool:
if not self.redis_client:
return False
try:
key = self._prefixed(cache_key)
serialized_data = self._serialize(answer)
if len(serialized_data) > self.MAX_CACHE_SIZE:
logger.warning("Cache skipped: payload too large")
return False
self.redis_client.setex(key, ttl, serialized_data)
return True
except (RedisError, TypeError) as e:
logger.error(f"Cache write failed: {e}")
return False
def set_if_not_exists(
self,
cache_key: str,
answer: Dict[str, Any],
ttl: int = 86400,
) -> bool:
if not self.redis_client:
return False
try:
key = self._prefixed(cache_key)
serialized_data = self._serialize(answer)
result = self.redis_client.set(
key,
serialized_data,
ex=ttl,
nx=True,
)
return bool(result)
except Exception as e:
logger.error(f"set_if_not_exists failed: {e}")
return False
def delete(self, cache_key: str) -> bool:
if not self.redis_client:
return False
try:
key = self._prefixed(cache_key)
return bool(self.redis_client.delete(key))
except RedisError:
return False
def stats(self) -> Dict[str, Any]:
if not self.redis_client:
return {}
try:
info = self.redis_client.info()
return {
"used_memory": info.get("used_memory_human"),
"connected_clients": info.get("connected_clients"),
"keyspace_hits": info.get("keyspace_hits"),
"keyspace_misses": info.get("keyspace_misses"),
}
except Exception:
return {} |