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import toml
import yaml
import logging
import os
from os.path import join, isdir, isfile
from typing import Optional, Any, MutableMapping
from argparse import ArgumentParser
def _get_config_path(name: str) -> str:
formats = ['toml', 'yaml']
dirname = join(os.environ['HOME'], '.config', name)
if isdir(dirname):
for fmt in formats:
filename = join(dirname, f'config.{fmt}')
if isfile(filename):
return filename
raise IOError(f'config not found in {dirname}')
else:
filenames = [join(os.environ['HOME'], '.config', f'{name}.{format}') for format in formats]
for file in filenames:
if isfile(file):
return file
raise IOError(f'config not found')
class ConfigStore:
data: MutableMapping[str, Any]
app_name: Optional[str]
def __int__(self):
self.data = {}
self.app_name = None
def load(self, name: Optional[str] = None,
use_cli=True,
parser: ArgumentParser = None):
self.app_name = name
if (name is None) and (not use_cli):
raise RuntimeError('either config name must be none or use_cli must be True')
log_default_fmt = False
log_file = None
log_verbose = False
no_config = name is False
path = None
if use_cli:
if parser is None:
parser = ArgumentParser()
if not no_config:
parser.add_argument('-c', '--config', type=str, required=name is None,
help='Path to the config in TOML format')
parser.add_argument('-V', '--verbose', action='store_true')
parser.add_argument('--log-file', type=str)
parser.add_argument('--log-default-fmt', action='store_true')
args = parser.parse_args()
if not no_config and args.config:
path = args.config
if args.verbose:
log_verbose = True
if args.log_file:
log_file = args.log_file
if args.log_default_fmt:
log_default_fmt = args.log_default_fmt
if not no_config and path is None:
path = _get_config_path(name)
if no_config:
self.data = {}
else:
if path.endswith('.toml'):
self.data = toml.load(path)
elif path.endswith('.yaml'):
with open(path, 'r') as fd:
self.data = yaml.safe_load(fd)
if 'logging' in self:
if not log_file and 'file' in self['logging']:
log_file = self['logging']['file']
if log_default_fmt and 'default_fmt' in self['logging']:
log_default_fmt = self['logging']['default_fmt']
setup_logging(log_verbose, log_file, log_default_fmt)
if use_cli:
return args
def __getitem__(self, key):
return self.data[key]
def __setitem__(self, key, value):
raise NotImplementedError('overwriting config values is prohibited')
def __contains__(self, key):
return key in self.data
config = ConfigStore()
def is_development_mode() -> bool:
if 'FLASK_ENV' in os.environ and os.environ['FLASK_ENV'] == 'development':
return True
return ('logging' in config) and ('verbose' in config['logging']) and (config['logging']['verbose'] is True)
def setup_logging(verbose=False, log_file=None, default_fmt=False):
logging_level = logging.INFO
if is_development_mode() or verbose:
logging_level = logging.DEBUG
_add_logging_level('TRACE', logging.DEBUG-5)
log_config = {'level': logging_level}
if not default_fmt:
log_config['format'] = '%(asctime)s - %(name)s - %(levelname)s - %(message)s'
if log_file is not None:
log_config['filename'] = log_file
log_config['encoding'] = 'utf-8'
logging.basicConfig(**log_config)
# https://stackoverflow.com/questions/2183233/how-to-add-a-custom-loglevel-to-pythons-logging-facility/35804945#35804945
def _add_logging_level(levelName, levelNum, methodName=None):
"""
Comprehensively adds a new logging level to the `logging` module and the
currently configured logging class.
`levelName` becomes an attribute of the `logging` module with the value
`levelNum`. `methodName` becomes a convenience method for both `logging`
itself and the class returned by `logging.getLoggerClass()` (usually just
`logging.Logger`). If `methodName` is not specified, `levelName.lower()` is
used.
To avoid accidental clobberings of existing attributes, this method will
raise an `AttributeError` if the level name is already an attribute of the
`logging` module or if the method name is already present
Example
-------
>>> addLoggingLevel('TRACE', logging.DEBUG - 5)
>>> logging.getLogger(__name__).setLevel("TRACE")
>>> logging.getLogger(__name__).trace('that worked')
>>> logging.trace('so did this')
>>> logging.TRACE
5
"""
if not methodName:
methodName = levelName.lower()
if hasattr(logging, levelName):
raise AttributeError('{} already defined in logging module'.format(levelName))
if hasattr(logging, methodName):
raise AttributeError('{} already defined in logging module'.format(methodName))
if hasattr(logging.getLoggerClass(), methodName):
raise AttributeError('{} already defined in logger class'.format(methodName))
# This method was inspired by the answers to Stack Overflow post
# http://stackoverflow.com/q/2183233/2988730, especially
# http://stackoverflow.com/a/13638084/2988730
def logForLevel(self, message, *args, **kwargs):
if self.isEnabledFor(levelNum):
self._log(levelNum, message, args, **kwargs)
def logToRoot(message, *args, **kwargs):
logging.log(levelNum, message, *args, **kwargs)
logging.addLevelName(levelNum, levelName)
setattr(logging, levelName, levelNum)
setattr(logging.getLoggerClass(), methodName, logForLevel)
setattr(logging, methodName, logToRoot)
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