156 lines
5.3 KiB
Python
156 lines
5.3 KiB
Python
"""passbook core config loader"""
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import os
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from collections import Mapping
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from contextlib import contextmanager
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from glob import glob
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from typing import Any
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from urllib.parse import urlparse
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import yaml
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from django.conf import ImproperlyConfigured
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from django.utils.autoreload import autoreload_started
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from structlog import get_logger
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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 = get_logger()
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ENV_PREFIX = 'PASSBOOK'
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ENVIRONMENT = os.getenv(f'{ENV_PREFIX}_ENV', 'local')
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class ConfigLoader:
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"""Search through SEARCH_PATHS and load configuration. Environment variables starting with
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`ENV_PREFIX` are also applied.
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A variable like PASSBOOK_POSTGRESQL__HOST would translate to postgresql.host"""
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loaded_file = []
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__config = {}
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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(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.update_from_env()
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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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if isinstance(value, str):
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value = self.parse_uri(value)
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root[key] = value
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return root
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def parse_uri(self, value):
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"""Parse string values which start with a URI"""
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url = urlparse(value)
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if url.scheme == 'env':
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value = os.getenv(url.netloc, url.query)
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return value
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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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LOGGER.debug("Loaded config", file=path)
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self.loaded_file.append(path)
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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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def update_from_env(self):
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"""Check environment variables"""
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outer = {}
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idx = 0
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for key, value in os.environ.items():
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if not key.startswith(ENV_PREFIX):
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continue
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relative_key = key.replace(f"{ENV_PREFIX}_", '').replace('__', '.').lower()
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# Recursively convert path from a.b.c into outer[a][b][c]
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current_obj = outer
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dot_parts = relative_key.split('.')
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for dot_part in dot_parts[:-1]:
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if dot_part not in current_obj:
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current_obj[dot_part] = {}
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current_obj = current_obj[dot_part]
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current_obj[dot_parts[-1]] = value
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idx += 1
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if idx > 0:
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LOGGER.debug("Loaded environment variables", count=idx)
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self.update(self.__config, outer)
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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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@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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# 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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def y_bool(self, path: str, default=False) -> bool:
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"""Wrapper for y that converts value into boolean"""
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return str(self.y(path, default)).lower() == 'true'
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CONFIG = ConfigLoader()
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# pylint: disable=unused-argument
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def signal_handler(sender, **_):
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"""Add all loaded config files to autoreload watcher"""
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for path in CONFIG.loaded_file:
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sender.watch_file(path)
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autoreload_started.connect(signal_handler)
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