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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 = []
end
def tagged(*tags)
new_tags = Array.wrap(tags).flatten
@tags += new_tags
yield
ensure
new_tags.size.times { @tags.pop }
end
def add(severity, message = nil, progname = nil, &block)
@logger.add(severity, "#{tags}#{message}", progname, &block)
end
def fatal(progname = nil, &block)
add(@logger.class::FATAL, progname, &block)
end
def error(progname = nil, &block)
add(@logger.class::ERROR, progname, &block)
end
def warn(progname = nil, &block)
add(@logger.class::WARN, progname, &block)
end
def info(progname = nil, &block)
add(@logger.class::INFO, progname, &block)
end
def debug(progname = nil, &block)
add(@logger.class::DEBUG, progname, &block)
end
def unknown(progname = nil, &block)
add(@logger.class::UNKNOWN, progname, &block)
end
def method_missing(method, *args)
@logger.send(method, *args)
end
private
def tags
if @tags.any?
@tags.collect { |tag| "[#{tag}]" }.join(" ") + " "
end
end
end
end
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