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Products.PerFactErrors

This package provides error handling in a second transaction after the doomed transaction was already rolled back, but within the same request.

It subscribes a method to ZPublisher.interfaces.IPubFailure, which is thrown after the actual transaction aborted. This allows the error handling procedure to interact with the database and eventually commit a transaction.

Usage

To implement an error handling procedure that is executed after the failed transaction is already rolled back, place a method named afterfail_error_message_ so it is found in the context of where the error occurs. Additionally, you should have a standard_error_message, especially under Zope 4, where otherwise a default error view is called after the handler and overwrites the output.

Within the doomed transaction, standard_error_message is called and its result is used for the response of the request by default. After the transaction is rolled back, afterfail_error_message_ is called with the same arguments (error_type, error_value and error_tb) in a new transaction, which is afterwards commited unless an uncaught exception occurs inside the method. If the method returns a string, this replaces the response. If it returns None, the original response from standard_error_message is used.

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