Wraps any standard Logger object to provide tagging capabilities.
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.
# File lib/active_support/tagged_logging.rb, line 58 def self.new(logger) # Ensure we set a default formatter so we aren't extending nil! logger.formatter ||= ActiveSupport::Logger::SimpleFormatter.new logger.formatter.extend Formatter logger.extend(self) end
# File lib/active_support/tagged_logging.rb, line 71 def flush clear_tags! super if defined?(super) end
# File lib/active_support/tagged_logging.rb, line 67 def tagged(*tags) formatter.tagged(*tags) { yield self } end