The WebError behavior is known, if I'm not wrong is already documented
somewhere in tg doc that you must disable debugging to make streaming
work.
Anyway, streaming doc has to improve, I'll try to write some more for 2.2 doc.
If you want to use the request inside a streamed response you can do
something like:
@expose()
def stream(self):
def output_pause(req):
num = 0
while 1:
num += 1
yield '%s/%s<br/>' % (req.path_info, num)
time.sleep(1)
return output_pause(request._current_obj())
On Tue, Apr 17, 2012 at 7:03 AM, kgk <[email protected]> wrote:
>
> TG installs WebError to give the nice debugging
> tracebacks in the browser.
>
> For default projects, development.ini has
>
> set debug = True
>
> which gives the traceback in the browser. Recently we have defaulted this
> to false which then sends errors as emails and is more secure for
> productions sites. Turns out this changes the behavior of streaming
> applications When debug is true, streaming apps
> are actually fully collected into a list before being returned[1].
> Now that it is false, it is actually returning an iterator[2].
> Depending on debug either errormiddleware or evalexception is
> placed on the WSGI stack[3].
>
> We noticed that exposed methods that return iterators
> now lost access to several variables
> notably. tg.request and tg.response and all the thread-local variables
> usually there.
>
> During the TG application setup a Registry middleware component is added
> that pushes on request entry and pops on response these thread-local
> variables. This component has a streaming option (that defaults
> to false)[4][5]. Without the streaming option, the request
> object is popped as soon as the method returns even though
> the iterator is still returned up for processing.
>
> Sooo.. if your application needs to return iterators:
>
> 1. set debug = true in site.cfg
> 2. or patch [4] to read
> app = RegistryManager(app, True)
>
> Can't seem to find a ticket system to file this..
>
>
> [1] WebError-0.10.3-py2.6.egg/weberror/evalexception.py:438
> [2] WebError-0.10.3-py2.6.egg/weberror/errormiddleware.py:163
> [3] TurboGears2-2.1.4-py2.6.egg/tg/error.py:89
> [4] TurboGears2-2.1.4-py2.6.egg/tg/configuration.py:970
> [5] Paste-1.7.5.1bisque1-py2.6.egg/paste/registry:367
>
>
>
>
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