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54 lines
2.0 KiB
Python
54 lines
2.0 KiB
Python
"""Process-wide logging configuration."""
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import os
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import sys
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# Set once per process: create_app() runs many times in a test session and
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# gunicorn imports the module before forking, so an unguarded addHandler would
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# duplicate every log line N times.
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_logging_configured = False
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def configure_logging(app):
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"""Give the app a real logging setup.
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Services across the codebase call ``logging.getLogger(__name__).warning(...)``
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but nothing ever configured the root logger, so those records fell through to
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logging's last-resort handler: WARNING and above only, no timestamp, no
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logger name, INFO dropped on the floor. That is why a panel that was failing
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to serve its own agent installer (issue #101) produced no diagnostic trail at
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all. ``LOG_LEVEL`` overrides the default.
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"""
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global _logging_configured
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import logging
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level_name = os.environ.get('LOG_LEVEL', '').upper()
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if level_name and hasattr(logging, level_name):
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level = getattr(logging, level_name)
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elif app.config.get('TESTING'):
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# TestingConfig sets DEBUG=True, so keying off DEBUG alone would move the
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# whole test suite to DEBUG logging as a side effect of adding a handler.
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level = logging.INFO
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else:
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level = logging.DEBUG if app.config.get('DEBUG') else logging.INFO
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from flask.logging import default_handler
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root = logging.getLogger()
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root.setLevel(level)
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app.logger.setLevel(level)
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# Flask attaches its own handler to app.logger, which ALSO propagates to the
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# root logger. Leaving both in place prints every app.logger record twice --
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# once as Flask's `%(module)s` and once as ours as `%(name)s`. Drop Flask's
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# and let the single root handler below own the output.
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app.logger.removeHandler(default_handler)
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if not _logging_configured:
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handler = logging.StreamHandler(sys.stderr)
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handler.setFormatter(logging.Formatter(
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'[%(asctime)s] %(levelname)s in %(name)s: %(message)s'
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))
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root.addHandler(handler)
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_logging_configured = True
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