text: # -*- coding: utf-8 -*-
  #
  # Licensed to the Apache Software Foundation (ASF) under one
  # or more contributor license agreements.  See the NOTICE file
  # distributed with this work for additional information
  # regarding copyright ownership.  The ASF licenses this file
  # to you under the Apache License, Version 2.0 (the
  # "License"); you may not use this file except in compliance
  # with the License.  You may obtain a copy of the License at
  #
  #   http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing,
  # software distributed under the License is distributed on an
  # "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
  # KIND, either express or implied.  See the License for the
  # specific language governing permissions and limitations
  # under the License.
  from airflow.providers.redis.hooks.redis import RedisHook
  from airflow.sensors.base_sensor_operator import BaseSensorOperator
  from airflow.utils.decorators import apply_defaults
  
  
  class RedisKeySensor(BaseSensorOperator):
      """
      Checks for the existence of a key in a Redis
      """
      template_fields = ('key',)
      ui_color = '#f0eee4'
  
      @apply_defaults
      def __init__(self, key, redis_conn_id, *args, **kwargs):
          super().__init__(*args, **kwargs)
          self.redis_conn_id = redis_conn_id
          self.key = key
  
      def poke(self, context):
          self.log.info('Sensor checks for existence of key: %s', self.key)
          return RedisHook(self.redis_conn_id).get_conn().exists(self.key)
  