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db.py
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260 lines (214 loc) · 7.18 KB
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#!/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 os
import ast
import json
import copy
import threading
import binascii
from . import util
from .logging import Logger
JsonDBJsonEncoder = util.MyEncoder
def locked(func):
def wrapper(self, *args, **kwargs):
with self.lock:
return func(self, *args, **kwargs)
return wrapper
def modifier(func):
def wrapper(self, *args, **kwargs):
with self.lock:
self._modified = True
return func(self, *args, **kwargs)
return wrapper
class StoredAttr:
db = None
path = None
def __setattr__(self, key, value):
if self.db and key not in ['path', 'db']:
path = '/' + '/'.join(self.path + [key])
self.db.add_patch({'op': 'replace', 'path': path, 'value': value})
object.__setattr__(self, key, value)
def set_db(self, db, path):
self.db = db
self.path = path
def to_json(self):
d = dict(vars(self))
d.pop('path', None)
d.pop('db', None)
return d
_RaiseKeyError = object() # singleton for no-default behavior
class StorageDict(dict):
def __init__(self, data, db, path):
self.db = db
self.lock = self.db.lock if self.db else threading.RLock()
self.path = path
# recursively convert dicts to storagedict
for k, v in list(data.items()):
self.__setitem__(k, v, patch=False)
def convert_key(self, key):
# convert int, HTLCOwner to str
return str(int(key)) if isinstance(key, int) else key
@locked
def __setitem__(self, key, v, patch=True):
key = self.convert_key(key)
is_new = key not in self
# early return to prevent unnecessary disk writes
if not is_new and self[key] == v:
return
# recursively convert dict to StorageDict.
# _convert_dict is called breadth-first
if isinstance(v, dict):
if self.db:
v = self.db._convert_dict(self.path, key, v)
v = StorageDict(v, self.db, self.path + [key])
# convert_value is called depth-first
if isinstance(v, dict) or isinstance(v, str):
if self.db:
v = self.db._convert_value(self.path, key, v)
# set parent of StoredAttr
if isinstance(v, StoredAttr):
v.set_db(self.db, self.path + [key])
# set item
dict.__setitem__(self, key, v)
if self.db and patch:
path = '/' + '/'.join(self.path + [key])
op = 'add' if is_new else 'replace'
self.db.add_patch({'op': op, 'path': path, 'value': v})
@locked
def __delitem__(self, key):
key = self.convert_key(key)
dict.__delitem__(self, key)
if self.db:
path = '/' + '/'.join(self.path + [key])
self.db.add_patch({'op': 'remove', 'path': path})
@locked
def __getitem__(self, key):
key = self.convert_key(key)
return dict.__getitem__(self, key)
@locked
def __contains__(self, key):
key = self.convert_key(key)
return dict.__contains__(self, key)
@locked
def pop(self, key, v=_RaiseKeyError):
key = self.convert_key(key)
if key not in self:
if v is _RaiseKeyError:
raise KeyError(key)
else:
return v
r = dict.pop(self, key)
if self.db:
path = '/' + '/'.join(self.path + [key])
self.db.add_patch({'op': 'remove', 'path': path})
return r
@locked
def get(self, key, default=None):
key = self.convert_key(key)
return dict.get(self, key, default)
class StorageList:
def __init__(self, data, db, path):
self.l = [data[str(i)] for i in range(len(data))]
self.db = db
self.path = path
self.lock = self.db.lock if self.db else threading.RLock()
def locked(func):
def wrapper(self, *args, **kwargs):
with self.lock:
r = func(self, *args, **kwargs)
return r
return wrapper
@locked
def to_json(self):
return dict(enumerate(self.l))
@locked
def __getitem__(self, key):
return self.l.__getitem__(key)
@locked
def __contains__(self, v):
return self.l.__contains__(v)
@locked
def __len__(self):
return self.l.__len__()
@locked
def count(self, v):
return self.l.count(v)
@locked
def append(self, x):
self.l.append(x)
if self.db:
self.db.set_modified(True)
@locked
def remove(self, x):
self.l.remove(x)
if self.db:
self.db.set_modified(True)
@locked
def clear(self):
self.l.clear()
if self.db:
self.db.set_modified(True)
@locked
def reverse(self):
self.l.reverse()
class JsonDB(Logger):
def __init__(self, data):
Logger.__init__(self)
self.lock = threading.RLock()
self.data = data
self.pending_changes = []
self._modified = False
def set_modified(self, b):
with self.lock:
self._modified = b
def modified(self):
return self._modified
def add_patch(self, patch):
self.pending_changes.append(json.dumps(patch, cls=JsonDBJsonEncoder))
@locked
def get(self, key, default=None):
v = self.data.get(key)
if v is None:
v = default
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)