from uuid import uuid4
import os
from redis import StrictRedis
from eventsourcing.infrastructure.integersequencegenerators.base import AbstractIntegerSequenceGenerator
[docs]class RedisIncr(AbstractIntegerSequenceGenerator):
"""
Generates a sequence of integers, using Redis' INCR command.
Maximum number is 2**63, or 9223372036854775807, the maximum
value of a 64 bit signed integer.
"""
[docs] def __init__(self, redis=None, key=None):
redis_host = os.getenv('REDIS_HOST', 'localhost')
self.redis = redis or StrictRedis(host=redis_host)
self.key = key or 'integer-sequence-generator-{}'.format(uuid4())
[docs] def __next__(self):
return self.redis.incr(self.key) - 1