logger_thread_safe_level.rb

# frozen_string_literal: true

require "active_support/concern"
require "logger"

module ActiveSupport
  module LoggerThreadSafeLevel # :nodoc:
    extend ActiveSupport::Concern

    Logger::Severity.constants.each do |severity|
      class_eval(<<-EOT, __FILE__, __LINE__ + 1)
        def #{severity.downcase}?                # def debug?
          Logger::#{severity} >= level           #   DEBUG >= level
        end                                      # end
      EOT
    end

    def local_level
      IsolatedExecutionState[local_level_key]
    end

    def local_level=(level)
      case level
      when Integer
      when Symbol
        level = Logger::Severity.const_get(level.to_s.upcase)
      when nil
      else
        raise ArgumentError, "Invalid log level: #{level.inspect}"
      end
      if level.nil?
        IsolatedExecutionState.delete(local_level_key)
      else
        IsolatedExecutionState[local_level_key] = level
      end
    end

    def level
      local_level || super
    end

    # Change the thread-local level for the duration of the given block.
    def log_at(level)
      old_local_level, self.local_level = local_level, level
      yield
    ensure
      self.local_level = old_local_level
    end

    private
      def local_level_key
        @local_level_key ||= :"logger_thread_safe_level_#{object_id}"
      end
  end
end