This document is for Kombu's development version, which can be significantly different from previous releases. Get the stable docs here: 5.0.

Source code for kombu.log

"""Logging Utilities."""

from __future__ import annotations

import logging
import numbers
import os
import sys
from logging.handlers import WatchedFileHandler

from .utils.encoding import safe_repr, safe_str
from .utils.functional import maybe_evaluate
from .utils.objects import cached_property

__all__ = ('LogMixin', 'LOG_LEVELS', 'get_loglevel', 'setup_logging')

LOG_LEVELS = dict(logging._nameToLevel)
LOG_LEVELS.setdefault('FATAL', logging.FATAL)
LOG_LEVELS.setdefault(logging.FATAL, 'FATAL')

def get_logger(logger):
    """Get logger by name."""
    if isinstance(logger, str):
        logger = logging.getLogger(logger)
    if not logger.handlers:
    return logger

[docs]def get_loglevel(level): """Get loglevel by name.""" if isinstance(level, str): return LOG_LEVELS[level] return level
def naive_format_parts(fmt): parts = fmt.split('%') for i, e in enumerate(parts[1:]): yield None if not e or not parts[i - 1] else e[0] def safeify_format(fmt, args, filters=None): filters = {'s': safe_str, 'r': safe_repr} if not filters else filters for index, type in enumerate(naive_format_parts(fmt)): filt = filters.get(type) yield filt(args[index]) if filt else args[index]
[docs]class LogMixin: """Mixin that adds severity methods to any class."""
[docs] def debug(self, *args, **kwargs): return self.log(logging.DEBUG, *args, **kwargs)
[docs] def info(self, *args, **kwargs): return self.log(logging.INFO, *args, **kwargs)
[docs] def warn(self, *args, **kwargs): return self.log(logging.WARN, *args, **kwargs)
[docs] def error(self, *args, **kwargs): kwargs.setdefault('exc_info', True) return self.log(logging.ERROR, *args, **kwargs)
[docs] def critical(self, *args, **kwargs): kwargs.setdefault('exc_info', True) return self.log(logging.CRITICAL, *args, **kwargs)
[docs] def annotate(self, text): return f'{self.logger_name} - {text}'
[docs] def log(self, severity, *args, **kwargs): if DISABLE_TRACEBACKS: kwargs.pop('exc_info', None) if self.logger.isEnabledFor(severity): log = self.logger.log if len(args) > 1 and isinstance(args[0], str): expand = [maybe_evaluate(arg) for arg in args[1:]] return log(severity, self.annotate(args[0].replace('%r', '%s')), *list(safeify_format(args[0], expand)), **kwargs) else: return self.logger.log( severity, self.annotate(' '.join(map(safe_str, args))), **kwargs)
[docs] def get_logger(self): return get_logger(self.logger_name)
[docs] def is_enabled_for(self, level): return self.logger.isEnabledFor(self.get_loglevel(level))
[docs] def get_loglevel(self, level): if not isinstance(level, numbers.Integral): return LOG_LEVELS[level] return level
@cached_property def logger(self): return self.get_logger() @property def logger_name(self): return self.__class__.__name__
class Log(LogMixin): def __init__(self, name, logger=None): self._logger_name = name self._logger = logger def get_logger(self): if self._logger: return self._logger return super().get_logger() @property def logger_name(self): return self._logger_name
[docs]def setup_logging(loglevel=None, logfile=None): """Setup logging.""" logger = logging.getLogger() loglevel = get_loglevel(loglevel or 'ERROR') logfile = logfile if logfile else sys.__stderr__ if not logger.handlers: if hasattr(logfile, 'write'): handler = logging.StreamHandler(logfile) else: handler = WatchedFileHandler(logfile) logger.addHandler(handler) logger.setLevel(loglevel) return logger