I am using Jinja2 (2.8) under Python (3.4) with Tornado (4.3), and things
work well--except I am having trouble catching exceptions that Jinja2
raises.
For example, I will do something like this:
try:
buf = template.render(data=this_data)
except Exception as e:
buf = '<html><body>Error rendering
template.</body></html>'
However when an exception is raised by Jinja2 while rendering, it is not
caught by the except block. Instead, the exception bubbles up with a
traceback like this:
Can't convert 'NoneType' object to str implicitly
['Traceback (most recent call last):\n', ' File "C:/Projects/OsPy/OsPy.py",
line 1020, in background_process_post_authenticated\n buf =
template.render(data=this_data)\n', ' File
"C:\\Prog\\Python34\\lib\\site-packages\\jinja2\\environment.py", line 989,
in render\n return self.environment.handle_exception(exc_info, True)\n', '
File "C:\\Prog\\Python34\\lib\\site-packages\\jinja2\\environment.py", line
754, in handle_exception\n reraise(exc_type, exc_value, tb)\n', ' File
"C:\\Prog\\Python34\\lib\\site-packages\\jinja2\\_compat.py", line 37, in
reraise\n raise value.with_traceback(tb)\n', ' File "
I suspect that this has to do with the fact that I am using Tornado with
asynchronous execution and background threads (i.e. using
@tornado.gen.coroutine and @run_on_executor decorators), and handling the
exception with a future needs to be done differently. But I am new to all
of this...and am wondering if anyone has some suggestions.
Is anyone here using Jinja2 with Tornado and successfully trapping
exceptions?
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