old_contents: # -*- coding: utf-8 -*-
  
  import logging
  from logging.handlers import RotatingFileHandler
  from knot import Container
  from sqlalchemy import create_engine
  from .domain import Db, MeasurementService
  
  
  def build(app):
      c = Container(app.config)
  
      @c.factory(cache=True)
      def db(c):
          return Db(create_engine(
              c['SQLALCHEMY_DATABASE_URI'],
              echo=c['SQLALCHEMY_ECHO']
          ))
  
      @c.factory(cache=True)
      def measurement_service(c):
          return MeasurementService(c('db').measurement)
  
      @c.factory(cache=True)
      def logger(c):
          handler = RotatingFileHandler(
              c('LOGGER_FILENAME', '{}.log'.format(app.name)),
              maxBytes=c('LOGGER_MAX_BYTES', 1024*1024),
              backupCount=c('LOGGER_BACKUP_COUNT', 3)
          )
  
          handler.setLevel(c('LOGGER_LEVEL', logging.INFO))
          handler.setFormatter(logging.Formatter(
              c('LOGGER_FORMAT', "%(asctime)s %(levelname)s: %(message)s")
          ))
  
          app.logger.addHandler(handler)
  
          return app.logger
  
      return c
  
new_contents: # -*- coding: utf-8 -*-
  
  import logging
  from logging.handlers import RotatingFileHandler
  from knot import Container
  from sqlalchemy import create_engine
  from .domain import Db, MeasurementService
  
  
  def build(app):
      c = Container(app.config)
  
      @c.factory(cache=True)
      def db(c):
          return Db(create_engine(
              c['SQLALCHEMY_DATABASE_URI'],
              echo=c['SQLALCHEMY_ECHO']
          ))
  
      @c.factory(cache=True)
      def measurement_service(c):
          return MeasurementService(c('db').measurement)
  
      @c.factory(cache=True)
      def logger(c):
          handler = RotatingFileHandler(
              c('LOGGER_FILENAME', '{}.log'.format(app.name)),
              maxBytes=c('LOGGER_MAX_BYTES', 1024*1024),
              backupCount=c('LOGGER_BACKUP_COUNT', 3)
          )
  
          handler.setFormatter(logging.Formatter(
              c('LOGGER_FORMAT', "%(asctime)s %(levelname)s: %(message)s")
          ))
  
          app.logger.setLevel(c('LOGGER_LEVEL', logging.INFO))
          app.logger.addHandler(handler)
  
          return app.logger
  
      return c
  
subject: Define the log level of the logger instead of the handler.