Custom log handlers do not receive the original log message (hashtag1080)

[vikramsubramanian]

Reading Record.msg in a custom logging.Handler implementation returns a formatted message instead of the original text. Since I need to use a different format for different handlers this is quite problematic. This is also different from the Python logging.

Expected value: "That's it, beautiful and simple logging!"

Actual value: "2024-02-13 13:30:54.357 | DEBUG | __main__:run_it:31 - That's it, beautiful and simple logging!" )

[mayil-ai[bot]]

Possible Solution

• Review the emit method in the custom handler class that inherits from logging.Handler to ensure it does not apply additional formatting to the record.msg.
• Ensure that the Formatter associated with the custom handler is configured to use the desired format, which in this case should be just the message itself without any additional information like timestamp, level, or module.
• If the custom handler is intended to output the original message without formatting, modify the emit method to directly use record.msg when writing to the handler's sink.
• If different handlers require different formats, configure each handler with an appropriate Formatter that specifies the desired format string.
• If using Loguru, consider using the format parameter in the logger.add() method to specify the format for each handler individually.

Code snippets to check

loguru → _logger.py

This snippet contains the logic for formatting the log message, which is relevant to the issue of the custom handler receiving a formatted message instead of the original text. https://github.com/Mayil-AI/loguru/blob/871de74acb2382fb3982d3fb8e224e4a82de9073/loguru/_logger.py#L1981-L2033

loguru → _handler.py

This snippet is part of the handler's emit method, which is responsible for formatting the log message before passing it to the sink. It is relevant to the issue as it shows how the formatted message is created. https://github.com/Mayil-AI/loguru/blob/871de74acb2382fb3982d3fb8e224e4a82de9073/loguru/_handler.py#L152-L206 This snippet defines the emit method signature in the handler, which is the entry point for processing log records, including formatting. https://github.com/Mayil-AI/loguru/blob/871de74acb2382fb3982d3fb8e224e4a82de9073/loguru/_handler.py#L127-L127 This snippet is part of the emit method and shows conditions that could affect the formatting of the log message, which is relevant to the issue. https://github.com/Mayil-AI/loguru/blob/871de74acb2382fb3982d3fb8e224e4a82de9073/loguru/_handler.py#L129-L150