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80 lines
2.7 KiB
Python
80 lines
2.7 KiB
Python
"""This module holds functions and classes responsible for formatting the log output
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both to a file and to the console.
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"""
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import logging
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def get_log_filename(manifest_path):
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"""Returns the path to a logfile given a manifest
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The logfile name is constructed from the current timestamp and the basename of the manifest
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:param str manifest_path: The path to the manifest
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:return: The path to the logfile
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:rtype: str
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"""
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import os.path
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from datetime import datetime
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manifest_basename = os.path.basename(manifest_path)
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manifest_name, _ = os.path.splitext(manifest_basename)
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timestamp = datetime.now().strftime('%Y%m%d%H%M%S')
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filename = '{timestamp}_{name}.log'.format(timestamp=timestamp, name=manifest_name)
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return filename
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def setup_logger(logfile=None, debug=False):
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"""Sets up the python logger to log to both a file and the console
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:param str logfile: Path to a logfile
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:param bool debug: Whether to log debug output to the console
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"""
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root = logging.getLogger()
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# Make sure all logging statements are processed by our handlers, they decide the log level
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root.setLevel(logging.NOTSET)
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# Only enable logging to file if a destination was supplied
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if logfile is not None:
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# Create a file log handler
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file_handler = logging.FileHandler(logfile)
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# Absolute timestamps are rather useless when bootstrapping, it's much more interesting
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# to see how long things take, so we log in a relative format instead
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file_handler.setFormatter(FileFormatter('[%(relativeCreated)s] %(levelname)s: %(message)s'))
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# The file log handler always logs everything
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file_handler.setLevel(logging.DEBUG)
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root.addHandler(file_handler)
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# Create a console log handler
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import sys
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console_handler = logging.StreamHandler(sys.stderr)
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# We want to colorize the output to the console, so we add a formatter
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console_handler.setFormatter(ConsoleFormatter())
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# Set the log level depending on the debug argument
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if debug:
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console_handler.setLevel(logging.DEBUG)
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else:
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console_handler.setLevel(logging.INFO)
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root.addHandler(console_handler)
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class ConsoleFormatter(logging.Formatter):
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"""Formats log statements for the console
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"""
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level_colors = {logging.ERROR: 'red',
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logging.WARNING: 'magenta',
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logging.INFO: 'blue',
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}
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def format(self, record):
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if(record.levelno in self.level_colors):
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# Colorize the message if we have a color for it (DEBUG has no color)
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from termcolor import colored
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record.msg = colored(record.msg, self.level_colors[record.levelno])
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return super(ConsoleFormatter, self).format(record)
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class FileFormatter(logging.Formatter):
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"""Formats log statements for output to file
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Currently this is just a stub
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"""
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def format(self, record):
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return super(FileFormatter, self).format(record)
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