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require 'active_support/core_ext/object/blank'
require 'logger'
require 'active_support/logger'
module ActiveSupport
# Wraps any standard Logger object to provide tagging capabilities. Examples:
#
# logger = ActiveSupport::TaggedLogging.new(Logger.new(STDOUT))
# logger.tagged("BCX") { logger.info "Stuff" } # Logs "[BCX] Stuff"
# logger.tagged("BCX", "Jason") { logger.info "Stuff" } # Logs "[BCX] [Jason] Stuff"
# logger.tagged("BCX") { logger.tagged("Jason") { logger.info "Stuff" } } # Logs "[BCX] [Jason] Stuff"
#
# This is used by the default Rails.logger as configured by Railties to make it easy to stamp log lines
# with subdomains, request ids, and anything else to aid debugging of multi-user production applications.
module TaggedLogging
module Formatter # :nodoc:
# This method is invoked when a log event occurs
def call(severity, timestamp, progname, msg)
super(severity, timestamp, progname, "#{tags_text}#{msg}")
end
def clear!
current_tags.clear
end
def current_tags
Thread.current[:activesupport_tagged_logging_tags] ||= []
end
private
def tags_text
tags = current_tags
if tags.any?
tags.collect { |tag| "[#{tag}] " }.join
end
end
end
def self.new(logger)
logger.formatter.extend Formatter
logger.extend(self)
end
def tagged(*new_tags)
tags = formatter.current_tags
new_tags = new_tags.flatten.reject(&:blank?)
tags.concat new_tags
yield self
ensure
tags.pop(new_tags.size)
end
def flush
formatter.clear!
super if defined?(super)
end
end
end
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