是否可以将标准Ruby记录器配置为在每条消息后刷新？

Question

::Logger每次写入后,标准Ruby记录器(即)是否可以自动刷新？

更新:我正在设置自定义日志格式化程序,根据如何在rails日志中获取ruby中的时间戳:

class Foo
  def initialize(params = {})
    @logger = Logger.new $stdout
    @logger.formatter = LogFormatter.new
    @logger.level = params.include?(:log) ? params[:log] : Logger::INFO
    # ...
  end

  class LogFormatter < Logger::Formatter
    def call(severity, time, progname, message)
      timestamp = time.iso8601
      log_msg = "#{timestamp}#{" [#{severity}]" if %w{ERROR WARN}.include? severity} "
      if message.is_a? Exception
        log_msg += "#{message.message}"
        log_msg += ": #{message.backtrace.join "\n#{timestamp}  "}" unless message.backtrace.blank?
      else
        log_msg += message
      end

      "#{log_msg}\n"
    end
  end
end

我尝试使用来自idlefingers的建议如下:

  def initialize(params = {})
    Rails.logger.auto_flushing = 1
    @logger = Logger.new $stdout
    @logger.formatter = LogFormatter.new
    @logger.level = params.include?(:log) ? params[:log] : Logger::INFO
  end

但没有骰子.@logger.auto_flushing = 1对我来说也不起作用.我究竟做错了什么？

更新:事实证明,ActiveSupport ::Logger简单地包装了标准的Ruby ::Logger.毕竟,我的问题是关于Ruby而不是Rails.

Answer 1

事实证明,这只是打开sync底层IO对象的属性:

  def initialize(params = {})
    $stdout.sync = true unless RAILS_ENV == 'production'
    @logger = Logger.new $stdout
    @logger.formatter = LogFormatter.new
    @logger.level = params.include?(:log) ? params[:log] : Logger::INFO
  end