[Phpmyadmin-devel] AJAX error reporting system (catching errors)

Rouslan Placella rouslan at placella.com
Sun Jun 23 19:14:30 CEST 2013


On 06/22/2013 10:00 PM, Mohamed Ashraf wrote:
> On Sat, Jun 22, 2013 at 8:26 PM, Rouslan Placella <rouslan at placella.com> wrote:
>> On 06/22/2013 05:53 PM, Mohamed Ashraf wrote:
>>> On Sat, Jun 22, 2013 at 5:30 PM, Rouslan Placella <rouslan at placella.com> wrote:
>>>> On 06/22/2013 11:10 AM, Mohamed Ashraf wrote:
>>>>> On Sat, Jun 22, 2013 at 10:27 AM, Rouslan Placella <rouslan at placella.com> wrote:
>>>>>> On 06/22/2013 01:21 AM, Mohamed Ashraf wrote:
>>>>>>> On Saturday, June 22, 2013 at 12:49 AM, Rouslan Placella wrote:
>>>>>>>> On 06/16/2013 12:59 PM, Mohamed Ashraf wrote:
>>>>>>>>> On Wed, Jun 12, 2013 at 9:58 AM, Rouslan Placella
>>>>>>>>> <rouslan at placella.com> wrote:
>>>>>>>>>
>>>>>>>>>> Some of my thoughts are:
>>>>>>>>>>
>>>>>>>>>> * Try/catch has a performance penalty
>>>>>>>>> it is not too big as can be seen here
>>>>>>>>> http://jsperf.com/try-catch-performance-overhead
>>>>>>>>
>>>>>>>> Really? On some browsers it's about 20 times slower on the very
>>>>>>>> benchmark that you are linking to!
>>>>>>> Really!! That is strange I tested it multiple times and everytime it
>>>>>>> showed they are all equal in time. Which test case was 20 times slower?
>>>>>>
>>>>>> Opera 11 would be one of them. IE 10 is also quite bad, but by a lower
>>>>>> magnitude...
>>>>>
>>>>> the reduction in performance is usually in wrapping the inside of a
>>>>> function with try and catch. I was thinking of doing the other way and
>>>>> wrapping the functions from outside like this
>>>>>
>>>>> var temp  = PMA_foo
>>>>> PMA_foo = function() {
>>>>> try{
>>>>> temp.apply(window, arguments);
>>>>> } catch(e) {
>>>>> my_method(e);
>>>>> }
>>>>> }
>>>>>
>>>>> I am thinking of doing this to all global functions starting with PMA_
>>>>> and according to the benchmark this should have an equivalent
>>>>> performance to the no try catch  performance. also if we don't do
>>>>> anything of the sort then we would never get a stacktrace.
>>>>>
>>>>> the javascript in phpmyadmin is just for aesthetics and caching but it
>>>>> is not really very processor intensive anyway it is mostly about doing
>>>>> things to the page and sending requests to the server and most of the
>>>>> heavy lifting is done by jquery itself which I shall not change. The
>>>>> benchmark is to show what happens in the extreme case which may be
>>>>> problematic in node.js where the js code does heavy lifting and
>>>>> performance hits are problematic. however for the simple javascript we
>>>>> have, the negligible loss in performance cannot be perceived by the
>>>>> end users. but the stack traces we get could significantly better
>>>>> their experience in the long run.
>>>>>
>>>>> I will be using an automated function to add the try and catch at
>>>>> runtime so that there would be minimum modification to the codebase
>>>>> and it can be easily removed if required.
>>>>>
>>>>>>
>>>>>>>>>> * We need to be able to easily turn off the error reporting feature
>>>>>>>>> You can do it simply by setting a config option I have already set it
>>>>>>>>> up in the Header.class.php
>>>>>>>>>> * Some/most function names in the stack trace are going to be useless as
>>>>>>>>>> the production js code is minified.
>>>>>>>>>> * The line numbers in the file will not be of much help either, I guess,
>>>>>>>>>> unless we change the way that the files are minified (like forcing line
>>>>>>>>>> breaks every few hundred characters).
>>>>>>>>> since uglified js provides little to no information about the location
>>>>>>>>> of the error. what should we do. I checked up on source maps however
>>>>>>>>> the browser support is not enough. so what do you think should happen.
>>>>>>>>> I think the only way to go is to add try and catch to all the
>>>>>>>>> different functions if you need to find out where the error has
>>>>>>>>> occured. however adding try and catch statements to the entire
>>>>>>>>> codebase will decrease code readability considerably.
>>>>
>>>> Thank you for the explanation, it makes perfect sense. By the way, in
>>>> the above code snippet, to retain the correct context, it should be:
>>>>
>>>> temp.apply(this, arguments);
>>>
>>> Ah yes you are correct. I was thinking about how will I get the
>>> context and just assumed window. but you are correct "this" will refer
>>> to the correct context. there is a problem with this approach since
>>> these functions are only a small subset of the global functions used
>>> by phpmyadmin.
>>>
>>>>
>>>> Also, out of curiosity, would it be possible to use such a solution for
>>>> the event handlers that we register with AJAX.registerOnload?
>>>> What about jquery event handlers (e.g: $('#foo').click(somefunction) ) and jquery
>>>> ajax callbacks?
>>>
>>> sadly no since they are anonymous functions mostly and I do not have
>>> access to them unless I manually insert a try and catch in the code
>>> itself
>>
>> Well, you can hook into AJAX.registerOnload, using your code snippet
>> above. There you can reference the callback as "func". I just tested
>> this and it works.
>>
>>> also keep in mind this is just to get the most out of the error and as
>>> much as we do will still have exceptions that are thrown in parts of
>>> code that are not surrounded by try and catch statements and that is
>>> ok since there is a second line of defense with the "window.onerror".
>>> I am just trying to catch most errors without changing alot of the
>>> codebase and anything not caught we will still get an error report but
>>> just without a stacktrace. Also you should keep in mind that a
>>> stacktrace is not available in some browsers so even try and catch may
>>> not do any better than window.error
>>
>> I have a few thoughts on the matter.
>>
>> First of all, it may be useful to do a bit of feature detection. You
>> could deliberately throw an error and catch if, then check if the stack
>> trace is available inside it. Then, based on the result of this test you
>> could decide to wrap the code in a try/catch using your code snippet, if
>> the stack trace will be available, and if the stack trace will not be
>> available there would be no point in trying to catch the error that way
>> and you could leave the functions unwrapped to improve performance.
>>
> yes I will install many different browsers and try to test it on a
> browser without a stacktrace
> 
>> Another issue that I found is that, in my tests, the stack traces appear
>> to be very cluttered as the JS files are concatenated by the server.
> 
> can you give me an example of what you mean.

I attached a stack trace that I got in firefox, in chrome it looks a
little bit more useful, but not by much.

>> Not sure what we could do about this (keep track of number of lines offset
>> for each source file? something else?)...
>>
> yes this is a problem which I have thought about but have not yet
> figured out the solution. At first I just thought the developers can
> figure it out since they get the url and the phpmyadmin version so
> they can simulate the situation and see where a specific line is,
> however it turns out its not so easy at all. then I thought my
> webserver can do it for them and extract that part of the code and
> show it with the report but then I will have to interface with git
> from the web server and get the actual commit from whatever info that
> I have which would not have been easy. The thing that comes to mind
> now but I am still looking for a better solution is putting line
> markers in the generated js file. for example between each file I can
> output a js comment showing the current line number allowing the
> developer to narrow down his search but this is far from optimal and
> would appreciate any ideas

Line markers are not going to accomplish anything here. To solve this
issue you'd need to create a "stack trace translator" of some sort.
There are a few ways that this could be done. The first thing that
springs to my mind is to send the stack trace back to the server, where
the translation would happen. So, if you have something like this:

@http://localhost/pma/js/get_scripts.js.php?scripts[]=jquery/jquery-1.8.3.js&scripts[]=ajax.js&scripts[]=keyhandler.js&scripts[]=jquery/jquery-ui-1.9.2.custom.js&scripts[]=jquery/jquery.sprintf.js&scripts[]=jquery/jquery.cookie.js&scripts[]=jquery/jquery.mousewheel.js&scripts[]=jquery/jquery.event.drag-2.2.js&scripts[]=jquery/jquery-ui-timepicker-addon.js&scripts[]=jquery/jquery.ba-hashchange-1.3.js&scripts[]=jquery/jquery.debounce-1.0.5.js&scripts[]=jquery/jquery.menuResizer-1.0.js&scripts[]=rte.js&scripts[]=functions.js&scripts[]=navigation.js&scripts[]=indexes.js&scripts[]=common.js&scripts[]=codemirror/lib/codemirror.js&scripts[]=codemirror/mode/mysql/mysql.js:591

It would get translated into, for example:

@functions.js:123

It shouldn't be too difficult, on the server you would have to load the
necessary js files into memory (in exactly the same way that
get_scripts.js.php does) one by one and keep track of how many lines you
loaded so far. As soon as you go over the required line number (591, in
this case) you will know which file that line came from. Then you'd only
have to do some simple maths to figure out which line in that file we
are interested in. After the translation is done, you could just send
the new and improved stack trace back to the browser for error report
submission.

Keep in mind that different browsers seem to generate the traces in
different formats, so the solution would have to be quite flexible. The
original trace might be included in case the translation didn't work out...

Hope this helps.

Bye,
Rouslan

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