On Sunday, 18 March 2018 15:23:58 BST Jean-Paul Calderone wrote:
On Sun, Mar 18, 2018 at 11:21 AM, Jean-Paul Calderone <
On Sun, Mar 18, 2018 at 11:04 AM, Alex Railean email@example.com wrote:
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.
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.
from twisted.internet.defer import setDebugging setDebugging(True)
This gives you creation and callback stacks in the logs.
If you need to track down who put the value into the deferred you need to patch the defer.py code to log that info.
There are 2 places that a value enters the Deferred. The first is the callback() call. The other is in
653: current.result = callback(current.result, *args, **kw)
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?
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