writing a generic log formatter for rails and sneakers

application.rb

module App
  class Application < Rails::Application
    ...
    config.log_tags = [:request_id]
    ...
  end
end

custom_formatter.rb

class CustomFormatter < ActiveSupport::Logger::SimpleFormatter
  include ActiveSupport::TaggedLogging::Formatter
  def call(severity, timestamp, _progname, msg)
    {
      timestamp: timestamp,
      level: severity,
      guid: current_tags.first || SecureRandom.uuid, # use request_id for rails and generate a uuid for sneakers
      pid: $PID,
      message: msg
    }.to_json.to_s + " \n"
  end
end

log_initializer.rb

Rails.logger.formatter = CustomFormatter.new
Sneakers.logger.formatter = CustomFormatter.new

Sneaker log formatter

A very simple generic log formatter for sneakers and rails.