129 lines
4.4 KiB
Python
129 lines
4.4 KiB
Python
"""passbook lib config loader"""
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import os
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from collections.abc import Mapping
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from contextlib import contextmanager
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from glob import glob
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from logging import getLogger
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from typing import Any
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import yaml
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from django.conf import ImproperlyConfigured
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SEARCH_PATHS = [
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'passbook/lib/default.yml',
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'/etc/passbook/config.yml',
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'.',
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] + glob('/etc/passbook/config.d/*.yml', recursive=True)
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LOGGER = getLogger(__name__)
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ENVIRONMENT = os.getenv('PASSBOOK_ENV', 'local')
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class ConfigLoader:
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"""Search through SEARCH_PATHS and load configuration"""
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__config = {}
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__context_default = None
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__sub_dicts = []
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def __init__(self):
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super().__init__()
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base_dir = os.path.realpath(os.path.join(
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os.path.dirname(__file__), '../..'))
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for path in SEARCH_PATHS:
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# Check if path is relative, and if so join with base_dir
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if not os.path.isabs(path):
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path = os.path.join(base_dir, path)
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if os.path.isfile(path) and os.path.exists(path):
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# Path is an existing file, so we just read it and update our config with it
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self.update_from_file(path)
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elif os.path.isdir(path) and os.path.exists(path):
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# Path is an existing dir, so we try to read the env config from it
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env_paths = [os.path.join(path, ENVIRONMENT+'.yml'),
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os.path.join(path, ENVIRONMENT+'.env.yml')]
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for env_file in env_paths:
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if os.path.isfile(env_file) and os.path.exists(env_file):
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# Update config with env file
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self.update_from_file(env_file)
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self.handle_secret_key()
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def handle_secret_key(self):
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"""Handle `secret_key_file`"""
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if 'secret_key_file' in self.__config:
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secret_key_file = self.__config.get('secret_key_file')
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if os.path.isfile(secret_key_file) and os.path.exists(secret_key_file):
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with open(secret_key_file) as file:
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self.__config['secret_key'] = file.read().replace('\n', '')
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def update(self, root, updatee):
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"""Recursively update dictionary"""
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for key, value in updatee.items():
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if isinstance(value, Mapping):
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root[key] = self.update(root.get(key, {}), value)
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else:
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root[key] = value
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return root
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def update_from_file(self, path: str):
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"""Update config from file contents"""
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try:
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with open(path) as file:
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try:
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self.update(self.__config, yaml.safe_load(file))
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except yaml.YAMLError as exc:
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raise ImproperlyConfigured from exc
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except PermissionError as exc:
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LOGGER.warning('Permission denied while reading %s', path)
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def update_from_dict(self, update: dict):
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"""Update config from dict"""
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self.__config.update(update)
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@contextmanager
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def default(self, value: Any):
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"""Contextmanage that sets default"""
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self.__context_default = value
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yield
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self.__context_default = None
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@contextmanager
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# pylint: disable=invalid-name
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def cd(self, sub: str):
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"""Contextmanager that descends into sub-dict. Can be chained."""
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self.__sub_dicts.append(sub)
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yield
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self.__sub_dicts.pop()
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def get(self, key: str, default=None) -> Any:
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"""Get value from loaded config file"""
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if default is None:
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default = self.__context_default
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config_copy = self.raw
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for sub in self.__sub_dicts:
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config_copy = config_copy.get(sub, None)
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return config_copy.get(key, default)
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@property
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def raw(self) -> dict:
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"""Get raw config dictionary"""
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return self.__config
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# pylint: disable=invalid-name
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def y(self, path: str, default=None, sep='.') -> Any:
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"""Access attribute by using yaml path"""
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if default is None:
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default = self.__context_default
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# Walk sub_dicts before parsing path
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root = self.raw
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for sub in self.__sub_dicts:
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root = root.get(sub, None)
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# Walk each component of the path
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for comp in path.split(sep):
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if comp in root:
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root = root.get(comp)
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else:
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return default
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return root
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CONFIG = ConfigLoader()
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