68 lines
1.9 KiB
Python
Executable file
68 lines
1.9 KiB
Python
Executable file
import json
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import os
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import uuid
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import asyncio
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class Config:
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"""The "database" object. Internally based on ``json``."""
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def __init__(self, name, **options):
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self.name = name
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self.object_hook = options.pop('object_hook', None)
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self.encoder = options.pop('encoder', None)
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self.loop = options.pop('loop', asyncio.get_event_loop())
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self.lock = asyncio.Lock()
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if options.pop('load_later', False):
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self.loop.create_task(self.load())
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else:
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self.load_from_file()
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def load_from_file(self):
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try:
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with open(self.name, 'r') as f:
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self._db = json.load(f, object_hook=self.object_hook)
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except FileNotFoundError:
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self._db = {}
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async def load(self):
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with await self.lock:
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await self.loop.run_in_executor(None, self.load_from_file)
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def _dump(self):
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temp = '%s-%s.tmp' % (uuid.uuid4(), self.name)
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with open(temp, 'w', encoding='utf-8') as tmp:
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json.dump(self._db.copy(), tmp, ensure_ascii=True, cls=self.encoder, separators=(',', ':'))
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# atomically move the file
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os.replace(temp, self.name)
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async def save(self):
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with await self.lock:
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await self.loop.run_in_executor(None, self._dump)
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def get(self, key, *args):
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"""Retrieves a config entry."""
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return self._db.get(key, *args)
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async def put(self, key, value, *args):
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"""Edits a config entry."""
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self._db[key] = value
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await self.save()
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async def remove(self, key):
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"""Removes a config entry."""
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del self._db[key]
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await self.save()
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def __contains__(self, item):
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return item in self._db
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def __getitem__(self, item):
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return self._db[item]
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def __len__(self):
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return len(self._db)
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def all(self):
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return self._db
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