I have inherited a misbehaving system and am trying to troubleshoot it. The code is not documented and I cannot produce a minimal working example that illustrates the problem yet, as I don't know which parts are involved and how they relate.
The version of Twisted used is 16.1.1, running on Fedora 15.
My first attempt is to leverage Twisted's logging capabilities and retrieve information about the place in the code that leads to the error:
from twisted.python import log as twisted_log observer = twisted_log.PythonLoggingObserver(loggerName='twcore') observer.start()
This produces the following entries in the log: Unhandled error in Deferred: CRITICAL _legacy twcore Unhandled error in Deferred:
Traceback (most recent call last): Failure: __builtin__.type: <class 'twisted.internet.error.TimeoutError'> CRITICAL _legacy twcore
How can I get more clues about what is going on? I was expecting a line number, or a complete call-stack.
What are the recommended troubleshooting steps for finding the Deferred in which the error occurred? There are are around 30 of them throughout the code, is there a heuristic I can use to narrow down the list of suspects?