如何将ruby logger日志输出到stdout以及文件? [英] How can I have ruby logger log output to stdout as well as file?

问题描述

有点像记录器中的tee功能.

Someting like a tee functionality in logger.

推荐答案

您可以编写一个伪IO类，该类将写入多个IO对象.像这样:

You can write a pseudo IO class that will write to multiple IO objects. Something like:

class MultiIO
  def initialize(*targets)
     @targets = targets
  end

  def write(*args)
    @targets.each {|t| t.write(*args)}
  end

  def close
    @targets.each(&:close)
  end
end

然后将其设置为您的日志文件:

Then set that as your log file:

log_file = File.open("log/debug.log", "a")
Logger.new MultiIO.new(STDOUT, log_file)

每次Logger调用MultiIO对象上的puts时，它将同时写入STDOUT和日志文件.

Every time Logger calls puts on your MultiIO object, it will write to both STDOUT and your log file.

编辑:我继续研究了界面的其余部分.日志设备必须响应write和close(不是puts).只要MultiIO响应这些请求并将它们代理到实际的IO对象，这应该可以工作.

I went ahead and figured out the rest of the interface. A log device must respond to write and close (not puts). As long as MultiIO responds to those and proxies them to the real IO objects, this should work.

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