36 lines
1.0 KiB
Python
36 lines
1.0 KiB
Python
import redis
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redis_cycler_db = redis.Redis(host='localhost', port=6379, db=9)
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def redis_cycle(list_name):
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"""
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Emulates itertools.cycle() but returns the complete shuffled list.
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:param list_name:
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:return:
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"""
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to_move = redis_cycler_db.rpop(list_name)
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if not to_move:
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return []
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redis_cycler_db.lpush(list_name, to_move)
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new_list = redis_cycler_db.lrange(list_name, 0, -1)
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return [x.decode('utf-8') for x in new_list]
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def add_backend_cycler(list_name: str, new_elements: list):
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existing_elements = [i.decode('utf-8') for i in redis_cycler_db.lrange(list_name, 0, -1)]
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existing_set = set(existing_elements)
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with redis_cycler_db.pipeline() as pipe:
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# Add elements
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for element in new_elements:
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if element not in existing_set:
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pipe.rpush(list_name, element)
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# Remove elements
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for element in existing_set:
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if element not in new_elements:
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pipe.lrem(list_name, 0, element)
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pipe.execute()
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