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import json
from json import JSONDecodeError
import os
class ObjectStorage:
_data = None
_loaded = False
def __init__(self, path, root_type, fallback):
self.path = path
self.root_type = root_type
self.fallback = fallback
def get(self, name, default=None, data_type=None, bypass_cache=False):
data = self.load(bypass_cache)
if name in data:
value = data[name]
if data_type is not None:
try:
return data_type(value)
except (TypeError, ValueError):
pass
else:
return value
return default
def set(self, name, value, flush=True, bypass_cache=False):
data = self.load(bypass_cache)
data[name] = value
if flush:
self.save(data)
def callback(self, name, callback):
data = self.load()
if data and name in data:
return data[name]
data[name] = callback()
self.save(data)
return data[name]
def load(self, bypass_cache=False):
if not self._loaded or bypass_cache:
if os.path.exists(self.path):
with open(self.path, "r") as file:
try:
contents = json.load(file)
self._data = self.root_type(contents)
self._loaded = True
except (JSONDecodeError, TypeError, ValueError):
pass
if not self._loaded:
self._loaded = True
self._data = self.fallback
return self._data
def flush(self):
self.save(self.load())
def save(self, contents):
directory = os.path.dirname(self.path)
if directory and not os.path.exists(directory):
os.makedirs(directory)
with open(self.path, "w") as file:
json.dump(contents, file, indent=True)
def purge(self):
if os.path.exists(self.path):
os.remove(self.path)
def clear_cache(self):
self._loaded = False
self._data = None
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