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# frozen_string_literal: true
module Lumberjack
# This class can be used as the return value from a formatter +call+ method to
# extract additional attributes from an object being logged. This can be useful when there
# using structured logging to include important metadata in the log entry in addition
# to the message.
#
# @example
# # Automatically add attributes with error details when logging an exception.
# logger.add_formatter(Exception, ->(e) {
# Lumberjack::MessageAttributes.new(e.inspect, {
# error: {
# message: e.message,
# class: e.class.name,
# stack: e.backtrace
# }
# })
# })
class MessageAttributes
attr_reader :message, :attributes
# @param message [Object] The message to be logged.
# @param attributes [Hash] The attributes to be associated with the message.
def initialize(message, attributes)
@message = message
@attributes = attributes || {}
end
def to_s
inspect
end
def inspect
{message: @message, attributes: @attributes}.inspect
end
end
end
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