You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
83 lines
2.3 KiB
Python
83 lines
2.3 KiB
Python
2 years ago
|
"""Manager to read and modify config data in JSON files.
|
||
|
|
"""
|
||
|
|
# Copyright (c) IPython Development Team.
|
||
|
|
# Distributed under the terms of the Modified BSD License.
|
||
|
|
import errno
|
||
|
|
import json
|
||
|
|
import os
|
||
|
|
|
||
|
|
from traitlets.config import LoggingConfigurable
|
||
|
|
from traitlets.traitlets import Unicode
|
||
|
|
|
||
|
|
|
||
|
|
def recursive_update(target, new):
|
||
|
|
"""Recursively update one dictionary using another.
|
||
|
|
|
||
|
|
None values will delete their keys.
|
||
|
|
"""
|
||
|
|
for k, v in new.items():
|
||
|
|
if isinstance(v, dict):
|
||
|
|
if k not in target:
|
||
|
|
target[k] = {}
|
||
|
|
recursive_update(target[k], v)
|
||
|
|
if not target[k]:
|
||
|
|
# Prune empty subdicts
|
||
|
|
del target[k]
|
||
|
|
|
||
|
|
elif v is None:
|
||
|
|
target.pop(k, None)
|
||
|
|
|
||
|
|
else:
|
||
|
|
target[k] = v
|
||
|
|
|
||
|
|
|
||
|
|
class BaseJSONConfigManager(LoggingConfigurable):
|
||
|
|
"""General JSON config manager
|
||
|
|
|
||
|
|
Deals with persisting/storing config in a json file
|
||
|
|
"""
|
||
|
|
|
||
|
|
config_dir = Unicode(".")
|
||
|
|
|
||
|
|
def ensure_config_dir_exists(self):
|
||
|
|
try:
|
||
|
|
os.makedirs(self.config_dir, 0o755)
|
||
|
|
except OSError as e:
|
||
|
|
if e.errno != errno.EEXIST:
|
||
|
|
raise
|
||
|
|
|
||
|
|
def file_name(self, section_name):
|
||
|
|
return os.path.join(self.config_dir, section_name + ".json")
|
||
|
|
|
||
|
|
def get(self, section_name):
|
||
|
|
"""Retrieve the config data for the specified section.
|
||
|
|
|
||
|
|
Returns the data as a dictionary, or an empty dictionary if the file
|
||
|
|
doesn't exist.
|
||
|
|
"""
|
||
|
|
filename = self.file_name(section_name)
|
||
|
|
if os.path.isfile(filename):
|
||
|
|
with open(filename, encoding="utf-8") as f:
|
||
|
|
return json.load(f)
|
||
|
|
else:
|
||
|
|
return {}
|
||
|
|
|
||
|
|
def set(self, section_name, data):
|
||
|
|
"""Store the given config data."""
|
||
|
|
filename = self.file_name(section_name)
|
||
|
|
self.ensure_config_dir_exists()
|
||
|
|
|
||
|
|
f = open(filename, "w", encoding="utf-8")
|
||
|
|
with f:
|
||
|
|
json.dump(data, f, indent=2)
|
||
|
|
|
||
|
|
def update(self, section_name, new_data):
|
||
|
|
"""Modify the config section by recursively updating it with new_data.
|
||
|
|
|
||
|
|
Returns the modified config data as a dictionary.
|
||
|
|
"""
|
||
|
|
data = self.get(section_name)
|
||
|
|
recursive_update(data, new_data)
|
||
|
|
self.set(section_name, data)
|
||
|
|
return data
|