Any way to use custom logger & formatter for falcon logs

[k1r8r0wn]

F.e., I have now this log - {"time":"2024-10-24T13:19:48+00:00","severity":"info","oid":25200,"pid":1,"subject":"Falcon::Service::Application","message":"Binding to #<Async::HTTP::Endpoint http://0.0.0.0:3000/ {}>..."} but my custom logger uses another fields...

[ioquatix]

Yes you can completely change the log output format.

The documentation is brief but see CONSOLE_OUTPUT and https://socketry.github.io/console/guides/integration/index#custom-output-wrapper

[k1r8r0wn]

@ioquatix, hey there! Hope you're well!

I try to implement this like this:

.env:

CONSOLE_OUTPUT="HappyLogger"

lib/console/output/happy_logger.rb:

module Console
  module Output
    class HappyLogger
      def self.new(output, **options)
        Rails.logger.info(output, context: options) # I have custom Rails.logger, so actually I need to wrap other events as well (i.e. errors, etc.)
      end
    end
  end
end

and ... it worked, but not as I've expected. The reason is that the link with example has another code with call method and originally code here calls the self.new as I've understood.

What's more if I set the CONSOLE_OUTPUT="JSON", it doesn't log in json format.

[ioquatix]

Here is a full example of how to redirect all Console output to the Rails logger:

class RedirectToRailsLogger
  def initialize(output, **options)
    @output = output
    @options = options
  end
  
  def call(*arguments, severity: :info, **options, &block)
    if block_given?
      if block.arity == 0
        arguments << block.call
      else
        buffer = StringIO.new
        block.call(buffer)
        arguments << buffer.string
      end
    end
    
    Rails.logger.public_send(severity, *arguments, **options)
  end
end

ENV["CONSOLE_OUTPUT"] = "RedirectToRailsLogger"

require "rails"
require "console"

Rails.logger = ActiveSupport::TaggedLogging.new(ActiveSupport::Logger.new(STDOUT))

Console.info("Hello, Rails!")

If you want JSON output, that would now be a concern of Rails.logger to format the output.

[k1r8r0wn]

Thank you for the code given, I've checked and method call is unreachable.

Also I've still get messages inside the standard logger:

P.S. Have earlier the falcon (0.42.3), recently updated to the latest one - falcon (0.48.3).

[ioquatix]

If I run the example code, it definitely works:

Can you explain why call is unreachable?

[k1r8r0wn]

I've meant when I'm running the falcon host...