Re: wsgi silently swallows errors
> Consider the following wsgi app:
>
> def application(env, start_response):
> start_response('200 OK',[('Content-type','text/plain')])
> yield "hello"
> x=1/0
> yield "world"
>
> The result of this is that the web browser displays "hello" and an
> error
> message ends up in the web log. But there is no other indication that
> an error has occurred.
>
> Is there any way to get WSGI to not silently swallow errors that occur
> after start_response has been called?
yes, you can wrap your app in a WebError middleware
http://pypi.python.org/pypi/WebError
from weberror.evalexception import EvalException
application = EvalException(application)
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In theory, there is no difference between theory and practice.
But, in practice, there is.
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Re: wsgi silently swallows errors
On Jan 20, 8:03 am, Jean-Paul Calderone wrote:
> On Mon, 19 Jan 2009 12:15:29 -0800, Ron Garret wrote:
> >Consider the following wsgi app:
>
> >def application(env, start_response):
> > start_response('200 OK',[('Content-type','text/plain')])
> > yield "hello"
> > x=1/0
> > yield "world"
>
> >The result of this is that the web browser displays "hello" and an error
> >message ends up in the web log. But there is no other indication that
> >an error has occurred.
>
> >Is there any way to get WSGI to not silently swallow errors that occur
> >after start_response has been called?
>
> WSGI is a specification, not a piece of software. The specification isn't
> swallowing the error, some piece of software is. What WSGI container are
> you using?
Not Apache/mod_wsgi at least, as message would show in Apache error
logs.
[Tue Jan 20 09:03:19 2009] [info] [client ::1] mod_wsgi (pid=271,
process='wsgi', application='dangermouse:8224|/wsgi/scripts/
swallow.py'): Loading WSGI script '/usr/local/wsgi/scripts/swallow.py'
[Tue Jan 20 09:03:19 2009] [error] [client ::1] mod_wsgi (pid=271):
Exception occurred processing WSGI script '/usr/local/wsgi/scripts/
swallow.py'
[Tue Jan 20 09:03:19 2009] [error] [client ::1] Traceback (most recent
call last)
[Tue Jan 20 09:03:19 2009] [error] [client ::1] File "/usr/local/
wsgi/scripts/swallow.py", line 7, in application[Tue Jan 20 09:03:19
2009] [error] [client ::1] x=1/0
[Tue Jan 20 09:03:19 2009] [error] [client ::1] ZeroDivisionError:
integer division or modulo by zero
Would just need to make sure you look in the correct log if have
virtual host specific error logs.
Graham
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Re: wsgi silently swallows errors
On Mon, 19 Jan 2009 12:15:29 -0800, Ron Garret wrote:
Consider the following wsgi app:
def application(env, start_response):
start_response('200 OK',[('Content-type','text/plain')])
yield "hello"
x=1/0
yield "world"
The result of this is that the web browser displays "hello" and an error
message ends up in the web log. But there is no other indication that
an error has occurred.
Is there any way to get WSGI to not silently swallow errors that occur
after start_response has been called?
WSGI is a specification, not a piece of software. The specification isn't
swallowing the error, some piece of software is. What WSGI container are
you using?
Jean-Paul
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