gistfile1.txt

require "merb-mailer/mailer"
require 'socket'

Merb::Mailer.delivery_method = :sendmail

class ErrorMailer

  def self.template(name, error, context)
    data = <<-EOF
      I regret to inform you that your daemon, #{name}, caught an error at #{Time.now} while running on #{Socket.gethostname}.

      Its last words were:

      #{error.class.name}: #{error.message}
      
      Context:
      
      #{context.inspect}
      
      Backtrace:
      
      #{error.backtrace.join("\n")}

      My condolences.

      Sincerely,
      ErrorNotifier
    EOF
  end

  def self.deliver_condolences(name, err, ctx)
    m = Merb::Mailer.new :to => 'alerts@onespot.com',
                        :from => 'Error Notifier <notifier@onespot.com>',
                        :subject => "[#{name}] #{err.message}",
                        :text => template(name, err, ctx)
    m.deliver!
  end
end

def notify_upon_exception(name, context={})
  begin
    yield context
  rescue Exception => e
    ErrorMailer.deliver_condolences(name, e, context) if RAILS_ENV == 'production' || RAILS_ENV == 'staging'
    Rails.logger.error(e.message)
    e.backtrace.each { |line| Rails.logger.error(line) }
    nil
  end
end