Durable state

main.py

import time
import os
import json

state = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

tmp = "/tmp/buffer.json"
dst = "/tmp/dump.json"

# periodically dump application state to disk atomically
while True:
    with open(tmp, "w") as f:
        f.write(json.dumps(state))
        f.flush()
        os.fsync(f)
    os.rename(tmp, dst)
    time.sleep(10)