lib/safely/backtrace.rb
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 )
return if (last_exception = $!).nil?
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 )
# Log the last exception
trace_log.info "*** Below you'll find the most recent exception thrown, this will likely (but not certainly) be the exception that made your application exit abnormally ***"
trace_log.error last_exception
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