log_to_slack

Python log handler that posts to a Slack channel. Posts to the Slack API using https://github.com/slackapi/python-slack-sdk

Original work by Mathias Ose https://github.com/mathiasose/slacker_log_handler

Installation

pip install log-to-slack

Options

api_key (required)

Generate a key at https://api.slack.com/

channel (required)

Set which channel id you want to post to, e.g. "C0XXXXXXXXX".

username

The username that will post to Slack. Defaults to "Python logger".

icon_url

URL to an image to use as the icon for the logger user

icon_emoji

emoji to use as the icon. Overrides icon_url. If neither icon_url nor icon_emoji is set, ❗ will be used.

fail_silent

Defaults to False. If your API key is invalid or for some other reason the API call returns an error, this option will silently ignore the API error. If you enable this setting, make sure you have another log handler that will also handle the same log events, or they may be lost entirely.

Example Python logging handler

This is how you use log-to-slack as a regular Python logging handler. This example will send a error message to a slack channel.

import logging
import sys
from datetime import datetime
from log_to_slack import SlackLogHandler, NoStacktraceFormatter

logger = logging.getLogger("Daily Report")
logger.setLevel(logging.DEBUG)

""" Adding slack handler """
slack_handler = SlackerLogHandler(
    "xoxb-XXXXX-XXX",  # slack api token
    "C0XXXXXXXXX", # channel id not channel name
    stack_trace=True,
    fail_silent=True,
)
formatter = NoStacktraceFormatter(
    "%(asctime)s - %(name)s - %(levelname)s - %(message)s"
)
slack_handler.setFormatter(formatter)
slack_handler.setLevel(logging.ERROR)
logger.addHandler(slack_handler)

if __name__ == "__main__":
    logger.debug("Debug message to slack!")
    logger.info("Info message to slack!")
    logger.warning("Warning message to slack!")

    try:
        x = 5 / 0
    except:
        logger.exception("Exception message to slack!")
        # # you can also use the below statement to log error with trace info
        # logger.error("Error message to slack!", exc_info=True)

Slack message formatting

This example use a subclass that will send a formatted message to a slack channel. Reference: https://api.slack.com/reference/surfaces/formatting

class CustomLogHandler(SlackLogHandler):
    def build_msg(self, record):
        message = "> New message :\n" + record.getMessage()
        return message

License

Apache 2.0

See also: https://api.slack.com/terms-of-service