92 lines
2.7 KiB
Python
92 lines
2.7 KiB
Python
#!/usr/bin/env python
|
|
#
|
|
# Electrum - lightweight Bitcoin client
|
|
# Copyright (C) 2019 The Electrum Developers
|
|
#
|
|
# Permission is hereby granted, free of charge, to any person
|
|
# obtaining a copy of this software and associated documentation files
|
|
# (the "Software"), to deal in the Software without restriction,
|
|
# including without limitation the rights to use, copy, modify, merge,
|
|
# publish, distribute, sublicense, and/or sell copies of the Software,
|
|
# and to permit persons to whom the Software is furnished to do so,
|
|
# subject to the following conditions:
|
|
#
|
|
# The above copyright notice and this permission notice shall be
|
|
# included in all copies or substantial portions of the Software.
|
|
#
|
|
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
|
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
|
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
|
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
|
|
# BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
|
|
# ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
|
|
# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
|
# SOFTWARE.
|
|
import threading
|
|
import copy
|
|
import json
|
|
|
|
from . import util
|
|
from .logging import Logger
|
|
|
|
JsonDBJsonEncoder = util.MyEncoder
|
|
|
|
def modifier(func):
|
|
def wrapper(self, *args, **kwargs):
|
|
with self.lock:
|
|
self._modified = True
|
|
return func(self, *args, **kwargs)
|
|
return wrapper
|
|
|
|
def locked(func):
|
|
def wrapper(self, *args, **kwargs):
|
|
with self.lock:
|
|
return func(self, *args, **kwargs)
|
|
return wrapper
|
|
|
|
|
|
class JsonDB(Logger):
|
|
|
|
def __init__(self, data):
|
|
Logger.__init__(self)
|
|
self.lock = threading.RLock()
|
|
self.data = data
|
|
self._modified = False
|
|
|
|
def set_modified(self, b):
|
|
with self.lock:
|
|
self._modified = b
|
|
|
|
def modified(self):
|
|
return self._modified
|
|
|
|
@locked
|
|
def get(self, key, default=None):
|
|
v = self.data.get(key)
|
|
if v is None:
|
|
v = default
|
|
else:
|
|
v = copy.deepcopy(v)
|
|
return v
|
|
|
|
@modifier
|
|
def put(self, key, value):
|
|
try:
|
|
json.dumps(key, cls=JsonDBJsonEncoder)
|
|
json.dumps(value, cls=JsonDBJsonEncoder)
|
|
except:
|
|
self.logger.info(f"json error: cannot save {repr(key)} ({repr(value)})")
|
|
return False
|
|
if value is not None:
|
|
if self.data.get(key) != value:
|
|
self.data[key] = copy.deepcopy(value)
|
|
return True
|
|
elif key in self.data:
|
|
self.data.pop(key)
|
|
return True
|
|
return False
|
|
|
|
@locked
|
|
def dump(self):
|
|
return json.dumps(self.data, indent=4, sort_keys=True, cls=JsonDBJsonEncoder)
|