spawn a memcached-like redis instance

start_redis.py

def start_redis_server(redis_socket_path = "/tmp/redis.sock"):
    conf = b"""port 0
databases 1
unixsocket %s
maxmemory 100mb
maxmemory-policy volatile-lru
save ''""" % redis_socket_path.encode()
    logging.debug('launching redis with conf: %s' % conf)
    redis_process = subprocess.Popen(['redis-server', "-"], stdin = subprocess.PIPE, start_new_session=True)
    try:
        redis_process.communicate(conf, timeout=1)
    except:
        pass
    def kill_redis():
        os.killpg(os.getpgid(redis_process.pid), signal.SIGKILL)
    atexit.register(kill_redis)
    return redis_process