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require 'logger'
module ActiveSupport
# Wraps any standard Logger class 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.
class TaggedLogging
def initialize(logger)
@logger = logger
@tags = Hash.new { |h,k| h[k] = [] }
end
def tagged(*new_tags)
tags = current_tags
new_tags = Array.wrap(new_tags).flatten
tags.concat new_tags
yield
ensure
new_tags.size.times { tags.pop }
end
def add(severity, message = nil, progname = nil, &block)
@logger.add(severity, "#{tags_text}#{message}", progname, &block)
end
%w( fatal error warn info debug unkown ).each do |severity|
eval <<-EOM, nil, __FILE__, __LINE__ + 1
def #{severity}(progname = nil, &block)
add(Logger::#{severity.upcase}, progname, &block)
end
EOM
end
def flush(*args)
@tags.delete(Thread.current)
@logger.flush(*args) if @logger.respond_to?(:flush)
end
def method_missing(method, *args)
@logger.send(method, *args)
end
protected
def tags_text
tags = current_tags
if tags.any?
tags.collect { |tag| "[#{tag}]" }.join(" ") + " "
end
end
def current_tags
@tags[Thread.current]
end
end
end
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