baseimage-tutorial-framework/lib/tfw/logging.py

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# pylint: disable=bad-whitespace
from datetime import datetime
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from typing import TextIO, Union
from dataclasses import dataclass
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from traceback import format_exception
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from logging import DEBUG, getLogger, Handler, Formatter, Filter
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class Color:
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RED = '\033[31m'
GREEN = '\033[32m'
YELLOW = '\033[33m'
BLUE = '\033[34m'
CYAN = '\033[36m'
WHITE = '\033[37m'
RESET = '\033[0m'
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@dataclass
class Log:
stream: Union[str, TextIO]
formatter: Formatter
class Logger:
def __init__(self, logs, level=DEBUG):
self.root_logger = getLogger()
self.old_level = self.root_logger.level
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self.new_level = level
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self.handlers = []
for log in logs:
handler = LogHandler(log.stream)
handler.setFormatter(log.formatter)
self.handlers.append(handler)
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def start(self):
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self.root_logger.setLevel(self.new_level)
for handler in self.handlers:
self.root_logger.addHandler(handler)
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def stop(self):
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self.root_logger.setLevel(self.old_level)
for handler in self.handlers:
handler.close()
self.root_logger.removeHandler(handler)
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class LogHandler(Handler):
def __init__(self, stream):
if isinstance(stream, str):
self.stream = open(stream, 'a+')
self.close_stream = True
else:
self.stream = stream
self.close_stream = False
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super().__init__()
def emit(self, record):
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entry = self.format(record)
self.stream.write(entry+'\n')
self.stream.flush()
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def close(self):
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if self.close_stream:
self.stream.close()
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class LogFormatter(Formatter):
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severity_to_color = {
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'CRITICAL' : Color.RED,
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'ERROR' : Color.RED,
'WARNING' : Color.YELLOW,
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'INFO' : Color.GREEN,
'DEBUG' : Color.BLUE,
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'NOTSET' : Color.CYAN
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}
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def __init__(self, limit):
self.limit = limit
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super().__init__()
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def format(self, record):
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time = datetime.utcfromtimestamp(record.created).strftime('%H:%M:%S')
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if record.args:
tuple_args = (record.args,) if isinstance(record.args, dict) else record.args
clean_args = tuple((self.trim(arg) for arg in tuple_args))
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message = record.msg % clean_args
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else:
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message = record.msg
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trace = '\n'+''.join(format_exception(*record.exc_info)) if record.exc_info else ''
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return (f'[{Color.WHITE}{time}{Color.RESET}|>'
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f'{self.severity_to_color[record.levelname]}{record.module}:'
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f'{record.levelname.lower()}{Color.RESET}] {message}{trace}')
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def trim(self, value):
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if isinstance(value, dict):
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return {k: self.trim(v) for k, v in value.items()}
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if isinstance(value, str):
value_str = str(value)
return value_str if len(value_str) <= self.limit else f'{value_str[:self.limit]}...'
return value
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class VerboseLogFormatter(Formatter):
def format(self, record):
date = datetime.utcfromtimestamp(record.created).strftime('%H:%M:%S')
if record.args:
message = record.msg % record.args
else:
message = record.msg
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trace = '\n'+''.join(format_exception(*record.exc_info)) if record.exc_info else ''
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return (f'[{date}|>{record.module}:{record.levelname.lower()}] '
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f'{message}{trace}')
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class WhitelistFilter(Filter):
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def __init__(self, names):
self.names = names
super().__init__()
def filter(self, record):
return record.module in self.names
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class BlacklistFilter(Filter):
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def __init__(self, names):
self.names = names
super().__init__()
def filter(self, record):
return record.module not in self.names