dify/api/extensions/ext_logging.py

import logging
import os
import sys
from logging.handlers import RotatingFileHandler

from flask import Flask

from configs import dify_config


def init_app(app: Flask):
    log_handlers = []
    log_file = dify_config.LOG_FILE
    if log_file:
        log_dir = os.path.dirname(log_file)
        os.makedirs(log_dir, exist_ok=True)
        log_handlers.append(
            RotatingFileHandler(
                filename=log_file,
                maxBytes=dify_config.LOG_FILE_MAX_SIZE * 1024 * 1024,
                backupCount=dify_config.LOG_FILE_BACKUP_COUNT,
            )
        )

    # Always add StreamHandler to log to console
    log_handlers.append(logging.StreamHandler(sys.stdout))

    logging.basicConfig(
        level=dify_config.LOG_LEVEL,
        format=dify_config.LOG_FORMAT,
        datefmt=dify_config.LOG_DATEFORMAT,
        handlers=log_handlers,
        force=True,
    )
    log_tz = dify_config.LOG_TZ
    if log_tz:
        from datetime import datetime

        import pytz

        timezone = pytz.timezone(log_tz)

        def time_converter(seconds):
            return datetime.utcfromtimestamp(seconds).astimezone(timezone).timetuple()

        for handler in logging.root.handlers:
            handler.formatter.converter = time_converter