[IronPython] Foolproof IP Embedding

[Michael Foord]

On 08/07/2010 22:34, Alex wrote:
> Hello
> In my WPF application, I want to have an "expert mode" that lets the 
> end-user write inline python code targetting one specific control (a 
> sheetmusic). I embed IronPython and when the user code throws an 
> exception I catch it and display it but there are a few foolproof 
> problems:
>
> 1) If the user write some bad code in a function and binds it to one 
> of the control event, it will crash the whole app. Of course I can 
> recommand my users to always wrap event handlers into a try catch 
> block (or ask to use a decorator that do it) but it's not really 
> foolproof. I want to make it impossible to crash the whole app with 
> user code. Perhaps native events mecanism is a bit too low-level to be 
> foolproof?
>

Catch and report exceptions.

> 2) If the user code makes  an infinite loop it will hang the whole 
> app. I want to have a "panic button" to stop the script (and even 
> restart the python engine if necessary). I suppose I have to run user 
> code in a worker thread but then the user have to use Invoke mecanisms 
> each time he touchs an UI object? Is there an elegant pattern that 
> deals with this concerns?
>

Execute the user code on a background thread. Provide a means for 
actions to be invoked on the gui thread (wrapped in exception handling) 
if necessary. Provide a button to abort the thread if it goes on too long.

Michael

> This questions are more about .NET and patterns than IronPython, but I 
> figured some of you have already thought about it in your IP 
> experience. Thanks for any advices!
>
> Alex
>
>
>
>
>
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