How can I have ruby logger log output to stdout as well as file?

by

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

Then set that as your log file:

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

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

Edit: 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.

More Related Contents:

  1. Logging in Sinatra?
  2. Reassigning the value of variables in Ruby?
  3. What is attr_accessor in Ruby?
  4. How to get the name of the calling method?
  5. Why is `a = a` `nil` in Ruby?
  6. Cannot call non W3C standard command while in W3C mode (Selenium::WebDriver::Error::UnknownCommandError) with Selenium ChromeDriver in Cucumber Ruby
  7. What is the difference between Ruby 1.8 and Ruby 1.9
  8. Is there a reason that we cannot iterate on “reverse Range” in ruby?
  9. How does “(1..4).inject(&:+)” work in Ruby
  10. Get list of a class’ instance methods
  11. Why are my basic Heroku apps taking two seconds to load?
  12. Comparing ruby hashes [duplicate]
  13. How can I capture STDOUT to a string?
  14. Set global default encoding for ruby 1.9
  15. Learning Insertion Sort in Ruby
  16. Can’t install RMagick 2.13.1. Can’t find MagickWand.h.
  17. What do you call the -> operator in Ruby?
  18. Understanding Ruby’s load paths
  19. Understanding private methods in Ruby
  20. What is the difference between STDIN and $stdin in Ruby?
  21. Iterate through every file in one directory
  22. Passing a method as a parameter in Ruby
  23. What is the difference between Raising Exceptions vs Throwing Exceptions in Ruby?
  24. List of installed gems?
  25. How can I find the number of days between two Date objects in Ruby?
  26. What are those pipe symbols for in Ruby?
  27. Ruby’s yield feature in relation to computer science
  28. ERROR: Error installing ffi: ERROR: Failed to build gem native extension
  29. Why isn’t current directory on my Ruby path? [duplicate]
  30. Iterate over Ruby Time object with delta

Leave a Comment