44 lines
1.6 KiB
Python
44 lines
1.6 KiB
Python
import logging
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import os
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import sys
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# Check and gracefully fail if the user needs to install a 3rd-party dep.
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libnames = ['appdirs', 'configobj', 'colorlog']
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def check_env_has_dependencies(libnames):
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rc = True
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for libname in libnames:
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try:
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__import__(libname)
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except ModuleNotFoundError as ex:
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print('missing third-part library: ', ex, file=sys.stderr)
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rc = False
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return rc
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if not check_env_has_dependencies(libnames):
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print('refusing to load program without installed dependencies', file=sys.stderr)
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raise ImportError('python environment needs third-party dependencies installed')
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# Logger for before the application and logging config is loaded
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# - used to log before logging is configured
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_log_fmt = '%(levelname)-7s:%(message)s'
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_logger_name = 'app_skellington'
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_bootstrap_logger = logging.getLogger(_logger_name)
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# Logging is manually switched on via environment variable:
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if os.environ.get('APP_SKELLINGTON_DEBUG', None):
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_bootstrap_logger.setLevel(logging.DEBUG) # Don't filter any log levels
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fmt = logging.Formatter(_log_fmt)
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handler = logging.StreamHandler()
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handler.setFormatter(fmt)
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_bootstrap_logger.addHandler(handler)
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_bootstrap_logger.debug('debug log enabled: APP_SKELLINGTON_DEBUG set in environment variables')
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# Logging is by default off, excepting CRITICAL
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else:
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_bootstrap_logger.setLevel(logging.CRITICAL)
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_bootstrap_logger.propagate = False
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# NOTE(MG) Pretty sure the logger has the default handler too at this point.
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# It's been related to some issues with the logger double-printing messages.
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_bootstrap_logger.addHandler(logging.NullHandler())
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