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| # -*- mode:python; coding:utf-8 -*- | ||
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| # Copyright (c) 2020 IBM Corp. All rights reserved. | ||
| # | ||
| # Licensed under the Apache License, Version 2.0 (the "License"); | ||
| # you may not use this file except in compliance with the License. | ||
| # You may obtain a copy of the License at | ||
| # | ||
| # https://www.apache.org/licenses/LICENSE-2.0 | ||
| # | ||
| # Unless required by applicable law or agreed to in writing, software | ||
| # distributed under the License is distributed on an "AS IS" BASIS, | ||
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| # See the License for the specific language governing permissions and | ||
| # limitations under the License. | ||
| """Common logging utilities.""" | ||
| import argparse | ||
| import logging | ||
| import sys | ||
| from types import TracebackType | ||
| from typing import Optional, Type | ||
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| # Singleton logger instance | ||
| # All other CLI sub module will inherit settings of this logger as long as | ||
| # sub-module instantiates a logger with a prefix 'trestlebot' or __name__ | ||
| _logger = logging.getLogger('trestlebot') | ||
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| class SpecificLevelFilter(logging.Filter): | ||
| """ | ||
| Filter for the same level as provided by setLevel for a log handler. | ||
| Python by default logs all levels above to a given destination. This makes it easy to split levels where you might | ||
| log all levels to file and only errors to std.err, however, does not allow logging a specific level elsewhere. | ||
| """ | ||
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| def __init__(self, level: int) -> None: | ||
| """Initialize providing maximum level to be pushed through the filter.""" | ||
| self._level = level | ||
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| def filter(self, log_record: logging.LogRecord) -> bool: # noqa: A003 | ||
| """Filter log messages.""" | ||
| return log_record.levelno == self._level | ||
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| def set_global_logging_levels(level: int = logging.INFO) -> None: | ||
| """Initialise logging. | ||
| Should only be invoked by the CLI classes or similar. | ||
| """ | ||
| # This line stops default root loggers setup for a python context from logging extra messages. | ||
| # DO NOT USE THIS COMMAND directly from an SDK. Handle logs levels based on your own application | ||
| _logger.propagate = False | ||
| # Remove handlers | ||
| _logger.handlers.clear() | ||
| # set global level | ||
| _logger.setLevel(level) | ||
| # Create standard out | ||
| console_out_handler = logging.StreamHandler(sys.stdout) | ||
| console_out_handler.setLevel(logging.INFO) | ||
| console_out_handler.addFilter(SpecificLevelFilter(logging.INFO)) | ||
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| console_debug_handler = logging.StreamHandler(sys.stdout) | ||
| console_debug_handler.setLevel(logging.DEBUG) | ||
| console_debug_handler.addFilter(SpecificLevelFilter(logging.DEBUG)) | ||
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| console_error_handler = logging.StreamHandler(sys.stderr) | ||
| console_error_handler.setLevel(logging.WARNING) | ||
| # create formatters | ||
| error_formatter = logging.Formatter('%(name)s:%(lineno)d %(levelname)s: %(message)s') | ||
| debug_formatter = logging.Formatter('%(name)s:%(lineno)d %(levelname)s: %(message)s') | ||
| console_debug_handler.setFormatter(debug_formatter) | ||
| console_error_handler.setFormatter(error_formatter) | ||
| # add ch to logger | ||
| _logger.addHandler(console_out_handler) | ||
| _logger.addHandler(console_error_handler) | ||
| _logger.addHandler(console_debug_handler) | ||
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| def _exception_handler( | ||
| exception_type: Type[BaseException], exception: BaseException, traceback: Optional[TracebackType] | ||
| ) -> None: | ||
| """Empty exception handler to prevent stack traceback in quiet mode.""" | ||
| logging.warning(exception) | ||
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| def _get_trace_level() -> int: | ||
| """Get special value used for trace - just below DEBUG.""" | ||
| return logging.DEBUG - 5 | ||
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| def set_log_level_from_args(args: argparse.Namespace) -> None: | ||
| """Vanity function to automatically set log levels based on verbosity flags.""" | ||
| if args.verbose > 1: | ||
| # these msgs only output by trace calls | ||
| set_global_logging_levels(_get_trace_level()) | ||
| elif args.verbose == 1: | ||
| set_global_logging_levels(logging.DEBUG) | ||
| else: | ||
| set_global_logging_levels(logging.INFO) | ||
| sys.excepthook = _exception_handler | ||
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| def get_current_verbosity_level(logger: logging.Logger) -> int: | ||
| """Get the current verbosity level based on logging level.""" | ||
| level = logger.getEffectiveLevel() | ||
| if level < logging.DEBUG: | ||
| return 2 | ||
| elif level == logging.DEBUG: | ||
| return 1 | ||
| return 0 | ||
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| class Trace(): | ||
| """Class allowing low priority trace message when verbose > 1 and log level below DEBUG.""" | ||
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| def __init__(self, logger: logging.Logger) -> None: | ||
| """Store the main logger with its module name.""" | ||
| self._logger = logger | ||
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| def log(self, msg: str) -> None: | ||
| """Output the trace msg if log level is below DEBUG.""" | ||
| level = self._logger.getEffectiveLevel() | ||
| if level < logging.DEBUG: | ||
| self._logger.debug(msg) |
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