require 'logger' require 'pp' #== MonoLogger # A subclass of Ruby's stdlib Logger with all the mutex and logrotation stuff # ripped out. class MonoLogger < Logger # # === Synopsis # # Logger.new(name, shift_age = 7, shift_size = 1048576) # Logger.new(name, shift_age = 'weekly') # # === Args # # +logdev+:: # The log device. This is a filename (String) or IO object (typically # +STDOUT+, +STDERR+, or an open file). # +shift_age+:: # Number of old log files to keep, *or* frequency of rotation (+daily+, # +weekly+ or +monthly+). # +shift_size+:: # Maximum logfile size (only applies when +shift_age+ is a number). # # === Description # # Create an instance. # def initialize(logdev) @progname = nil @level = DEBUG @default_formatter = Formatter.new @formatter = nil @logdev = nil if logdev @logdev = LocklessLogDevice.new(logdev) end end class LocklessLogDevice < LogDevice def initialize(log = nil) @dev = @filename = @shift_age = @shift_size = nil if log.respond_to?(:write) and log.respond_to?(:close) @dev = log else @dev = open_logfile(log) @filename = log end @dev.sync = true end def write(message) @dev.write(message) rescue Exception => ignored warn("log writing failed. #{ignored}") end def close @dev.close rescue nil end private def open_logfile(filename) if (FileTest.exist?(filename)) open(filename, (File::WRONLY | File::APPEND)) else create_logfile(filename) end end def create_logfile(filename) logdev = open(filename, (File::WRONLY | File::APPEND | File::CREAT)) add_log_header(logdev) logdev end def add_log_header(file) file.write( "# Logfile created on %s by %s\n" % [Time.now.to_s, Logger::ProgName] ) end end end