Hi there, I'm working on a simple progress-bar type feature whereby
some progress information (eg, {'percentage': 25}) is stored in the
request.session and then read out again by an ajax callback from the
browser.
The code looks a bit like this:
@view_config(route_name="my_page", renderer="my_page.html")
def my_page(request):
""" main page request """
request.session.progress = {'percentage': 0};
return {}
@view_config(route_name="progress", renderer="json")
def get_progress(request):
""" get progress data """
return request.session['progress']
@view_config(route_name="progress", renderer="json")
def get_slow_results(request)
""" long-running request to retrieve some results """
res = []
for i, job in enumerate(things_to_do):
res.append(job())
request.session['progress'] = {'percentage' : float(i) /
float(len(things_to_do)) * 100.0}
request.session.changed()
return res
So the browser hits my_page, and then registers 2 ajax callbacks, one
to get_progress() and one to get_slow_results().
Each call to get_progress() triggers another one 1 second later until
its finished.
Now the problem is, that until get_slow_results() has finished and
returned its Response, the browser's calls to get_progress() return
the original session.progress, which is {'percentage': 0}.
When get_slow_results() has finished, it jumps up to {'percentage':
100'}.
Am I missing something fundamental here?
I'm using Pyramid 1.3, with pyramid_beaker sessions in in-memory
mode.
Thanks in advance,
Edward
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