prometheus-pve-sd/prometheuspvesd/utils.py
2021-06-09 20:44:10 +02:00

243 lines
6.7 KiB
Python

#!/usr/bin/env python3
"""Global utility methods and classes."""
import logging
import os
import sys
from distutils.util import strtobool
import colorama
from pythonjsonlogger import jsonlogger
CONSOLE_FORMAT = "{}{}[%(levelname)s]{} %(message)s"
JSON_FORMAT = "(asctime) (levelname) (message)"
def to_bool(string):
return bool(strtobool(str(string)))
def _should_do_markup():
py_colors = os.environ.get("PY_COLORS", None)
if py_colors is not None:
return to_bool(py_colors)
return sys.stdout.isatty() and os.environ.get("TERM") != "dumb"
colorama.init(autoreset=True, strip=not _should_do_markup())
class Singleton(type):
"""Meta singleton class."""
_instances = {}
def __call__(cls, *args, **kwargs):
if cls not in cls._instances:
cls._instances[cls] = super(Singleton, cls).__call__(*args, **kwargs)
return cls._instances[cls]
class LogFilter(object):
"""A custom log filter which excludes log messages above the logged level."""
def __init__(self, level):
"""
Initialize a new custom log filter.
:param level: Log level limit
:returns: None
"""
self.__level = level
def filter(self, logRecord): # noqa
# https://docs.python.org/3/library/logging.html#logrecord-attributes
return logRecord.levelno <= self.__level
class MultilineFormatter(logging.Formatter):
"""Logging Formatter to reset color after newline characters."""
def format(self, record): # noqa
record.msg = record.msg.replace("\n", "\n{}... ".format(colorama.Style.RESET_ALL))
return logging.Formatter.format(self, record)
class MultilineJsonFormatter(jsonlogger.JsonFormatter):
"""Logging Formatter to remove newline characters."""
def format(self, record): # noqa
record.msg = record.msg.replace("\n", " ")
return jsonlogger.JsonFormatter.format(self, record)
class Log:
"""Handle logging."""
def __init__(self, level=logging.WARN, name="prometheuspvesd", json=False):
self.logger = logging.getLogger(name)
self.logger.setLevel(level)
self.logger.addHandler(self._get_error_handler(json=json))
self.logger.addHandler(self._get_warn_handler(json=json))
self.logger.addHandler(self._get_info_handler(json=json))
self.logger.addHandler(self._get_critical_handler(json=json))
self.logger.addHandler(self._get_debug_handler(json=json))
self.logger.propagate = False
def _get_error_handler(self, json=False):
handler = logging.StreamHandler(sys.stderr)
handler.setLevel(logging.ERROR)
handler.addFilter(LogFilter(logging.ERROR))
handler.setFormatter(
MultilineFormatter(
self.error(
CONSOLE_FORMAT.format(
colorama.Fore.RED, colorama.Style.BRIGHT, colorama.Style.RESET_ALL
)
)
)
)
if json:
handler.setFormatter(MultilineJsonFormatter(JSON_FORMAT))
return handler
def _get_warn_handler(self, json=False):
handler = logging.StreamHandler(sys.stdout)
handler.setLevel(logging.WARN)
handler.addFilter(LogFilter(logging.WARN))
handler.setFormatter(
MultilineFormatter(
self.warn(
CONSOLE_FORMAT.format(
colorama.Fore.YELLOW, colorama.Style.BRIGHT, colorama.Style.RESET_ALL
)
)
)
)
if json:
handler.setFormatter(MultilineJsonFormatter(JSON_FORMAT))
return handler
def _get_info_handler(self, json=False):
handler = logging.StreamHandler(sys.stdout)
handler.setLevel(logging.INFO)
handler.addFilter(LogFilter(logging.INFO))
handler.setFormatter(
MultilineFormatter(
self.info(
CONSOLE_FORMAT.format(
colorama.Fore.CYAN, colorama.Style.BRIGHT, colorama.Style.RESET_ALL
)
)
)
)
if json:
handler.setFormatter(MultilineJsonFormatter(JSON_FORMAT))
return handler
def _get_critical_handler(self, json=False):
handler = logging.StreamHandler(sys.stderr)
handler.setLevel(logging.CRITICAL)
handler.addFilter(LogFilter(logging.CRITICAL))
handler.setFormatter(
MultilineFormatter(
self.critical(
CONSOLE_FORMAT.format(
colorama.Fore.RED, colorama.Style.BRIGHT, colorama.Style.RESET_ALL
)
)
)
)
if json:
handler.setFormatter(MultilineJsonFormatter(JSON_FORMAT))
return handler
def _get_debug_handler(self, json=False):
handler = logging.StreamHandler(sys.stderr)
handler.setLevel(logging.DEBUG)
handler.addFilter(LogFilter(logging.DEBUG))
handler.setFormatter(
MultilineFormatter(
self.critical(
CONSOLE_FORMAT.format(
colorama.Fore.BLUE, colorama.Style.BRIGHT, colorama.Style.RESET_ALL
)
)
)
)
if json:
handler.setFormatter(MultilineJsonFormatter(JSON_FORMAT))
return handler
def set_level(self, s):
self.logger.setLevel(s)
def debug(self, msg):
"""Format info messages and return string."""
return msg
def critical(self, msg):
"""Format critical messages and return string."""
return msg
def error(self, msg):
"""Format error messages and return string."""
return msg
def warn(self, msg):
"""Format warn messages and return string."""
return msg
def info(self, msg):
"""Format info messages and return string."""
return msg
def _color_text(self, color, msg):
"""
Colorize strings.
:param color: colorama color settings
:param msg: string to colorize
:returns: string
"""
return "{}{}{}".format(color, msg, colorama.Style.RESET_ALL)
def sysexit(self, code=1):
sys.exit(code)
def sysexit_with_message(self, msg, code=1):
self.logger.critical(str(msg))
self.sysexit(code)
class SingleLog(Log, metaclass=Singleton):
"""Singleton logging class."""
pass
class UnsafeTag:
"""Handle custom yaml unsafe tag."""
yaml_tag = u"!unsafe"
def __init__(self, value):
self.unsafe = value
@staticmethod
def yaml_constructor(loader, node):
return loader.construct_scalar(node)