module Safely class Backtrace class << self attr_accessor :trace_directory def enable! @enabled = true at_exit { log_exceptions } end def safe_shutdown! @enabled = false end def log_exceptions return unless @enabled && self.trace_directory && File.directory?( self.trace_directory ) require 'logger' trace_file = File.join( self.trace_directory, "backtrace-#{Time.now.strftime('%Y%m%d%H%M%S')}-#{Process.pid}.log" ) trace_log = Logger.new( trace_file ) # Find the last exception e = nil ObjectSpace.each_object {|o| if ::Exception === o e = o end } trace_log.info "*** Below you'll find the most recent exception thrown, this will likely (but not certainly) be the exception that made #{DaemonKit.configuration.daemon_name} exit abnormally ***" trace_log.error e trace_log.info "*** Below you'll find all the exception objects in memory, some of them may have been thrown in your application, others may just be in memory because they are standard exceptions ***" ObjectSpace.each_object {|o| if ::Exception === o trace_log.error o end } trace_log.close end end end end