# This program is free software: you can redistribute it and/or modify it under the # terms of the Apache License (v2.0) as published by the Apache Software Foundation. # # This program is distributed in the hope that it will be useful, but WITHOUT ANY # WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A # PARTICULAR PURPOSE. See the Apache License for more details. # # You should have received a copy of the Apache License along with this program. # If not, see <https://www.apache.org/licenses/LICENSE-2.0>. """Simple logging setup with colors.""" # type annotations from typing import Type, Callable, IO # standard libs import sys from dataclasses import dataclass # internal libs from ..color import ANSI_RESET from ..level import CRITICAL, Level, WARNING from ..message import Message from ..handler import StreamHandler from ..logger import Logger [docs]@dataclass class SimpleMessage(Message): """A message with a named `topic`.""" level: Level content: str topic: str [docs]class SimpleLogger(Logger): """Logger with :class:`SimpleMessage`.""" Message: Type[Message] = SimpleMessage topic: str def __init__(self, topic: str) -> None: """Initialize with `topic`.""" super().__init__() self.topic = topic self.callbacks = {'topic': (lambda: topic)} [docs]@dataclass class SimpleHandler(StreamHandler): """ Writes to <stderr> by default. Message format includes topic and level name. Attributes: level (:class:`~logalpha.level.Level`): The level for this handler. resource (:class:`Any`): Some resource to publish messages to. """ level: Level = WARNING resource: IO = sys.stderr [docs] def format(self, message: SimpleMessage) -> str: """Format the message.""" return f'{message.level.name:<8} [{message.topic}] {message.content}' [docs]@dataclass class ColorHandler(StreamHandler): """ Writes to <stderr> by default. Message format colorizes level name. Attributes: level (:class:`~logalpha.level.Level`): The level for this handler. resource (:class:`Any`): Some resource to publish messages to. """ level: Level = WARNING resource: IO = sys.stderr [docs] def format(self, message: SimpleMessage) -> str: """Format the message.""" color = SimpleLogger.colors[message.level.value].foreground return f'{color}{message.level.name:<8}{ANSI_RESET} [{message.topic}] {message.content}' DEBUG = Logger.levels[0] #: INFO = Logger.levels[1] #: WARNING = Logger.levels[2] #: ERROR = Logger.levels[3] #: CRITICAL = Logger.levels[4] #: