Spaces:
Build error
Build error
File size: 2,747 Bytes
a282d4b | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 | import os
import json
import time
from threading import Lock
try:
import redis
except ImportError:
redis = None
class MemoryCache:
def __init__(self):
self._cache = {}
self._lock = Lock()
def get(self, key):
with self._lock:
if key not in self._cache:
return None
val, expiry = self._cache[key]
if expiry is not None and time.time() > expiry:
del self._cache[key]
return None
return val
def set(self, key, value, ttl=None):
with self._lock:
expiry = time.time() + ttl if ttl is not None else None
self._cache[key] = (value, expiry)
def delete(self, key):
with self._lock:
if key in self._cache:
del self._cache[key]
class CacheManager:
def __init__(self):
self.redis_url = os.getenv("REDIS_URL", "redis://localhost:6379/0")
self.redis_client = None
self.use_redis = False
if redis is not None:
try:
self.redis_client = redis.Redis.from_url(self.redis_url, socket_timeout=1.0)
# Test connection
self.redis_client.ping()
self.use_redis = True
print("Connected to Redis successfully.")
except Exception as e:
print(f"Redis connection failed ({e}). Falling back to in-memory cache.")
else:
print("Redis library not installed. Falling back to in-memory cache.")
self.memory_cache = MemoryCache()
def get(self, key: str):
if self.use_redis:
try:
val = self.redis_client.get(key)
if val:
return json.loads(val.decode('utf-8'))
except Exception as e:
# Fallback to memory on Redis error during operation
print(f"Redis get failed ({e}). Using memory cache fallback.")
return self.memory_cache.get(key)
def set(self, key: str, value, ttl: int = None):
if self.use_redis:
try:
self.redis_client.set(key, json.dumps(value), ex=ttl)
return
except Exception as e:
print(f"Redis set failed ({e}). Using memory cache fallback.")
self.memory_cache.set(key, value, ttl)
def delete(self, key: str):
if self.use_redis:
try:
self.redis_client.delete(key)
return
except Exception as e:
print(f"Redis delete failed ({e}). Using memory cache fallback.")
self.memory_cache.delete(key)
# Global cache instance
cache = CacheManager()
|