text: # SPDX-FileCopyrightText: 2015 Eric Larson
  #
  # SPDX-License-Identifier: Apache-2.0
  
  from __future__ import division
  
  from datetime import datetime
  from cachecontrol.cache import BaseCache
  
  
  class RedisCache(BaseCache):
  
      def __init__(self, conn):
          self.conn = conn
  
      def get(self, key):
          return self.conn.get(key)
  
      def set(self, key, value, expires=None):
          if not expires:
              self.conn.set(key, value)
          else:
              expires = expires - datetime.utcnow()
              self.conn.setex(key, int(expires.total_seconds()), value)
  
      def delete(self, key):
          self.conn.delete(key)
  
      def clear(self):
          """Helper for clearing all the keys in a database. Use with
          caution!"""
          for key in self.conn.keys():
              self.conn.delete(key)
  
      def close(self):
          """Redis uses connection pooling, no need to close the connection."""
          pass
  