invoke any RPC method that prints a traceback (perhaps raise an exception in it, catch it and use logging.exception to log it) --> the traceback will display a very strange looking KeyError (its value being the name of the invoked method) and then the actual exception that was fed into logging.exception
The reason for this is that SimpleXMLRPCDispatcher._dispatch first attempts to acquire the function to invoke by reading from the functions registered with the dispatcher. When this attempt fails, KeyError is raised. During its handling different approaches are taken to acquire the function and for all but one when the function is acquired, handling of the KeyError ends and the function is called properly, outside of the except block
However, in the case of objects that define the _dispatch(method, params) function, the _dispatch(method, params) function is called straight away, still within the except block handling the KeyError, and this leads to the mangled traceback
This behavior is neither documented, nor expected (we believe) and thus the code should be changed
Misc/NEWSso that it is managed by towncrier #552
Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.
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