Extend log configuration by logging template

[ityshchenko]

Hi, everyone!

I need a set plain-text format with an ordered key sequence for my application. How I can properly change the default logging template or apply my own log-handler to asyncio.entrypoint?

Thanks!

[mosquito]

Sorry for the long answer, but I couldn't figure out how to do it right and not break anything. A good option would be the option shown in the example below:

import os
import logging
from logging.handlers import RotatingFileHandler
from gzip import GzipFile

import aiomisc


class GzipLogFile(GzipFile):
    def write(self, data) -> int:
        if isinstance(data, str):
            data = data.encode()
        return super().write(data)


class RotatingGzipFileHandler(RotatingFileHandler):
    def shouldRollover(self, record):
        if not os.path.isfile(self.baseFilename):
            return False
        if self.stream is None:
            self.stream = self._open()
        return 0 < self.maxBytes < os.stat(self.baseFilename).st_size

    def _open(self):
        return GzipLogFile(filename=self.baseFilename, mode=self.mode)


async def main():
    for _ in range(1_000):
        logging.info("Hello world")


with aiomisc.entrypoint(log_config=False) as loop:
    # Your custom handlers
    handlers = [
        logging.StreamHandler(),
        RotatingGzipFileHandler(
            "app.log.gz",
            # 10 megabytes
            maxBytes=10 * 2 ** 20,
            backupCount=100
        ),
    ]

    logging.basicConfig(
        level=logging.INFO,
        # Wrapping all handlers in separate streams will not block the 
        # event-loop even if gzip takes a long time to open the 
        # file.
        handlers=map(aiomisc.log.wrap_logging_handler, handlers)
    )
    loop.run_until_complete(main())