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Greg Hauptmann

2007-May-24 20:44 UTC

Exception Notification Plugin Question

Hi,

I have two questions re  the Exception Notifier plugin (i.e. which you
install via "ruby script/plugin install exception_notification")

Q1 - In it''s current setup (where it uses /public/500.html) is it
possible
to remove the "Status: 500 Internal Server Error Content-Type:
text/html"
text which seems to mysteriously get place at the top of the page?

Q2 - What''s the best way to add dynamic text to the error page?  Should
I
change the following section of the plug-in to point to a normal Rails
action/rhtml view?  But if I do this would this be making the design
brittle, i.e. what happens if there is a Rails internal issue itself which
could mean it''s not possible for the error action/rhtml view to work?
    ....................................................................
    def render_500
      respond_to do |type|
        type.html { render :file =>
"#{RAILS_ROOT}/public/500.html", :status
=> "500 Error" }
        .
        .
    ....................................................................


Tks
Greg

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Greg Hauptmann

2007-May-25 00:33 UTC

head link

Re: Exception Notification Plugin Question

PS.  In fact I think I may have been the scenario for which Exception
Notification was targeted at.  Would the the below be correct:

[1] Uncaught Exception (i.e. not expected)
  => Exception Notification handles these / sends email

[2] Caught Exceptions (understood issue - can offer specific user advice)
  => Use of custom application exception, global handler which can:
     (a) send email alert, (b) display dynamic text in custom application
     error view.rhtml.  That is concept is you can throw a custom app
     exception anywhere in a model/controller and not have to worry about
     adding a handler/view.
  => QUESTION 1 - Where/how to catch such exception in the one spot and
     and handle this?  Extend Exception Notification plugin?

[3] Complex Business Rules (in Model, but not per field)
  => Use of Rails Validation framework but via adding validations
     to :base within the error object

[4] Per Field Validations
  => Use of Rails Validations


On 5/25/07, Greg Hauptmann
<greg.hauptmann.ruby-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:>
> Hi,
>
> I have two questions re  the Exception Notifier plugin (i.e. which you
> install via "ruby script/plugin install exception_notification")
>
> Q1 - In it''s current setup (where it uses /public/500.html) is it
possible
> to remove the "Status: 500 Internal Server Error Content-Type:
text/html"
> text which seems to mysteriously get place at the top of the page?
>
> Q2 - What''s the best way to add dynamic text to the error page? 
Should I
> change the following section of the plug-in to point to a normal Rails
> action/rhtml view?  But if I do this would this be making the design
> brittle, i.e. what happens if there is a Rails internal issue itself which
> could mean it''s not possible for the error action/rhtml view to
work?
>     ....................................................................
>     def render_500
>       respond_to do |type|
>         type.html { render :file =>
"#{RAILS_ROOT}/public/500.html",
> :status => "500 Error" }
>         .
>         .
>     ....................................................................
>
>
> Tks
> Greg
>
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Xin Zheng

2007-May-29 23:02 UTC

head link

Re: Exception Notification Plugin Question

I would also be interested to know how to do what Greg has mentioned.

With my web application, it would help me to pindown the issue if I know 
the ID of the record in question. I''d like to add this to the exception
error.

Does anyone know the best way to do this?

Xin

Greg Hauptmann wrote:> Hi,
> 
> I have two questions re  the Exception Notifier plugin (i.e. which you
> install via "ruby script/plugin install exception_notification")
> 
> Q1 - In it''s current setup (where it uses /public/500.html) is it 
> possible
> to remove the "Status: 500 Internal Server Error Content-Type: 
> text/html"
> text which seems to mysteriously get place at the top of the page?
> 
> Q2 - What''s the best way to add dynamic text to the error page? 
Should
> I
> change the following section of the plug-in to point to a normal Rails
> action/rhtml view?  But if I do this would this be making the design
> brittle, i.e. what happens if there is a Rails internal issue itself 
> which
> could mean it''s not possible for the error action/rhtml view to
work?
>     ....................................................................
>     def render_500
>       respond_to do |type|
>         type.html { render :file =>
"#{RAILS_ROOT}/public/500.html",
> :status
> => "500 Error" }
>         .
>         .
>     ....................................................................
> 
> 
> Tks
> Greg

-- 
Posted via http://www.ruby-forum.com/.

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Greg Hauptmann

2007-May-30 19:13 UTC

head link

Re: Exception Notification Plugin Question

Xin,


I''ve ended up doing the following so far, some of which are adjustments
to
Jamis Buck''some "Exception Notification" plugin. 
I''m still optimizing this
for my own usage as I go.  Hope this helps (any ideas/feedback welcome):

Usage:
if error_situation_occurs
  raise Error.new( "Message to User Here - Will be shown on error
page",
                   "Additional message that will go to log file for
developers",
                    Logger::ERROR)
end

Features:
* Separate user & developer messages
* Do not have to catch such errors back in controller or views as the
below-mentioned rails rescue frame work will handle (i.e. less work, cleaner
code)
* Just need to raise the Error exception which then triggers/implies/carries
out:
  (a) appropriate email message to user
  (b) developer specific additional message to logs
  (c) severity of log entry raised
  (b) triggers Email/SMS alert based on severity of the error (use of Ruby
Logger severity levels)


-----------------------------------
class Error < RuntimeError
  attr :developer_message
  attr :severity

  def initialize(user, dev=nil, sev=Logger::FATAL)
    super user                          # Use normal exception parameter for
User Message
    @developer_message = dev || user    # Set developer focused message
    @severity = sev
  end
end
-----------------------------------
def rescue_action_in_public(exception)    # Override this Rails method
  case exception
    when *exceptions_to_treat_as_404
      render_404
    else
      if exception.instance_of?(Error)   # Added by Greg
        # Custom Error (caught)
        render_custom_error
        case (exception.severity)
        when Logger::FATAL
          # trigger an email/sms for FATALs
          send_notification(exception)
        else
          # no emails/sms otherwise - future step: have this configurable in
environment.rb
        end
      else
        # 500 Error (not caught)
        render_500
        send_notification(exception)
      end
  end
end
--------------------------------
def render_custom_error
  respond_to do |type|
    type.html { render :template => "error/custom_500_error"}
    type.all  { render :nothing => true, :status => "500 Error"
}
  end
end
---------------------------------
def log_error(exception) #:doc:           # Override this Rails method
  ActiveSupport::Deprecation.silence do
    if ActionView::TemplateError === exception
      logger.fatal(exception.to_s)
    else
      if exception.instance_of?(Error)    # Added by Greg - logs the User
Message, Log/Developer Message and limits stack trace to first 3 lines
        # Custom Error (caught)
        logger.error("#{exception.developer_message}\n" +
          "  Exception Class:#{exception.class}\n" +
          "  User Msg: #{exception.message}\n" +
          "  Backtrace:\n  " +
clean_backtrace(exception)[0..2].join("\n
") + "\n\n"
        )
      else
        logger.fatal("#{exception.developer_message}\n" +
          "  Exception Class:#{exception.class}\n" +
          "  Backtrace:\n  " +
clean_backtrace(exception)[0..2].join("\n
") + "\n\n"
        )
      end
    end
  end
end




On 5/30/07, Xin Zheng
<rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:>
>
> I would also be interested to know how to do what Greg has mentioned.
>
> With my web application, it would help me to pindown the issue if I know
> the ID of the record in question. I''d like to add this to the
exception
> error.
>
> Does anyone know the best way to do this?
>
> Xin
>
> Greg Hauptmann wrote:
> > Hi,
> >
> > I have two questions re  the Exception Notifier plugin (i.e. which you
> > install via "ruby script/plugin install
exception_notification")
> >
> > Q1 - In it''s current setup (where it uses /public/500.html)
is it
> > possible
> > to remove the "Status: 500 Internal Server Error Content-Type:
> > text/html"
> > text which seems to mysteriously get place at the top of the page?
> >
> > Q2 - What''s the best way to add dynamic text to the error
page?  Should
> > I
> > change the following section of the plug-in to point to a normal Rails
> > action/rhtml view?  But if I do this would this be making the design
> > brittle, i.e. what happens if there is a Rails internal issue itself
> > which
> > could mean it''s not possible for the error action/rhtml view
to work?
> >    
....................................................................
> >     def render_500
> >       respond_to do |type|
> >         type.html { render :file =>
"#{RAILS_ROOT}/public/500.html",
> > :status
> > => "500 Error" }
> >         .
> >         .
> >    
....................................................................
> >
> >
> > Tks
> > Greg
>
>
> --
> Posted via http://www.ruby-forum.com/.
>
> >
>
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