如何将 ruby​​ 记录器日志输出到标准输出以及文件? [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 T 恤功能.

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.类似的东西:

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 对您的 MultiIO 对象调用 puts 时，它都会写入 STDOUT 和您的日志文件.

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

我继续研究了界面的其余部分.日志设备必须响应write 和close(而不是puts).只要 MultiIO 响应这些并将它们代理到真正的 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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