[Sugar-devel] web-activity: env.getEnvironment dependency with Python code

[Daniel Narvaez]

This makes me wonder if the current approach is actually racy by the way...
I'm not sure the window object is guaranteed to be ready even on the
load_finished event. Network and javascript context might be completely
independent from this point of view (they are in separate processes after
all).

I feel the best approach here is the webkit extension really, even if it
requires a little bit of C code.

On Wednesday, 27 November 2013, Daniel Narvaez wrote:

> Hi,
>
> did you try to implement it and see if it works? I probably tried this
> when I first implemented getEnvironment but I might have done it wrong or
> something. My worry is that the javascript context might not be ready yet
> at that time, so either the python js code would fail or affect the old
> view.
>
> By the way, if you are determined to solve this and the loaded_started
> approach doesn't work, I know it would be possible to make it work using
> this
>
> http://webkitgtk.org/reference/webkit2gtk/unstable/WebKitScriptWorld.html
>
> It runs in the web process, so it tells you exactly when a new window
> object is created. Though using that API requires an extension written in C
> :/ If despite that you are interested in working on that I can give you
> some more pointers.
>
> On Wednesday, 27 November 2013, Rogelio Mita wrote:
>
>> I noticed existence of a WebKitWebView event which is emitted before what
>> any resource be loaded, called webkit_loaded_started<http://webkitgtk.org/reference/webkit2gtk/stable/WebKitWebView.html#WEBKIT-LOAD-STARTED:CAPS>
>>
>>> WEBKIT_LOAD_STARTED: A new load request has been made. No data has been
>>> received yet, empty structures have been allocated to perform the load; the
>>> load may still fail due to transport issues such as not being able to
>>> resolve a name, or connect to a port.
>>
>> I did a concept proof on sugar-toolkit-gtk3 to show this behaviour and
>> the result was:
>>
>> [image: Imágenes integradas 1]
>>
>> I think that this behaviour can solve the issue with env.getEnvironment
>> and your hard dependency with sugar var provided by python code.
>>
>> This log also show how load_event_finished is executed between successive
>> requests, then there is no doubt about the current problem existence.
>>
>> You think this may be a solution?, change the script so that it is now
>> run in this event (load_event_started) and rewrite getEnvironment
>> disregarding the possibility that there is no environment variable provided
>> by the Python code, in others words ever when activity is in sugar mode,
>> window.sugar.environment will be present
>>
>>
>> --
>> Roger
>>
>> Activity Central <http://activitycentral.com/>
>>
>
>
> --
> Daniel Narvaez
>
>

-- 
Daniel Narvaez
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