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License: MIT
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import json | |
import time | |
import logging | |
from collections import UserDict | |
class AutoReloadConfig(UserDict): | |
""" | |
A dictionary that automatically reloads itself from a file. | |
On each call to __getitem__(), check if config is older than reload_period and if yes then reload from file. | |
Example: | |
# load from config.json every 60s | |
config = AutoReloadConfig("config.json", 60) | |
# gets value from config (and reloads beforehand if last get was before 60s) | |
test = config["test"] | |
""" | |
def __init__(self, config_filename, reload_period = 60): | |
self._logger = logging.getLogger("config") | |
self._reload_period = reload_period | |
self._filename = config_filename | |
self._age = 0 | |
def __getitem__(self, key): | |
if self._age + self._reload_period < time.time(): | |
self._reload() | |
return super().__getitem__(key) | |
def _reload(self): | |
try: | |
with open(self._filename) as fp: | |
config = json.load(fp) | |
self._age = time.time() | |
# set data used by UserDict | |
self.data = config | |
self._logger.debug("config reloaded") | |
except: | |
self._logger.exception("failed to reload configuration from file \"" + self._filename + "\".") | |
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