> def wrap(result):
> result = iter(result)
> try:
> while True:
> yield result.next()
> except Exception, e:
> yield str(e) # here we yield Exception
Yielding error might not be the appropriate thing do. Surely,
displaying error in the log might be useful for debugging.
Status can't be changed to "500 internal error" because the headers
will be already sent when exception happens.
In fact, application doesn't cleanup properly when iterator raises
some exception. It should be fixed.
Here is some code to make iterator safe. Until it is fixed, use
safegenerator to decorate your GET/POST methods with yield statements.
def safeiter(it, cleanup=None):
"""Makes given iterator safe by catching any exceptions it raises.
If optional cleanup argument is passed, it is called at the end of
the iteration.
"""
try:
for x in it:
yield next(it)
except StopIteration:
pass
else:
import traceback
traceback.print_exc()
if cleanup:
cleanup()
def safegenerator(f):
"""Decorator to make a generator safe."""
def g(*a, **kw):
return safeiter(f(*a, **kw))
return g
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