Flask-Cache looks outdated. You can switch to Flask-Caching which is maintained fork of Flask-Cache.
Delete the Redis key by pattern
You have two options :
- Connect to Redis separately using the redis package. Use core commands provided by the package to search for keys based on a pattern, and delete them.
- Use protected methods of the Flask-Cache / Flask-Caching to get access to the underlying Redis object, and use core commands on that object to search for keys based on a pattern, and delete them.
Option 1: Separate connection to Redis
# python utility for redis
import redis
r = redis.Redis(host=REDIS_HOST, port=REDIS_PORT, db=REDIS_DB, password=REDIS_PASSWORD)
def delete_pattern(pattern: str) -> int:
"""Remove all keys matching pattern.
"""
count = 0
for key in r.scan_iter(pattern):
r.delete(key)
count += 1
return count
# pass pattern to delete
CACHE_URL_PAT = "flask_cache*auth*"
delete_pattern(CACHE_URL_PAT)
Option 2: Use the protected methods to get access to the underlying Redis connection object
⚠️ Even though this works fine, but these are undocumented methods. I went through the source code on GitHub to create this function.
Tested only for CACHE_TYPE = 'redis'
# initialised cache object stored in extensions file
from app.extensions import cache
def delete_pattern(pattern):
status = False
binary_keys = cache.cache._read_clients.keys(pattern)
keys = [k.decode("utf-8", errors="ignore") for k in binary_keys if k]
if keys:
status = cache.cache._write_client.delete(*keys)
return status
# pass pattern to delete
CACHE_URL_PAT = "flask_cache*auth*"
delete_pattern(CACHE_URL_PAT)
NOTE : flask_cache_ is default CACHE_KEY_PREFIX in Flask-Caching. If you have used some other value for CACHE_KEY_PREFIX, please use that (instead of flask_cache_) as the prefix for your search pattern.
